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Issue
1, Volume 9, January 2010
Title of the Paper:
Role of
Different Order Ranges of Autocorrelation Sequence on the Performance of
Speech Recognition
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Authors: Poonam Bansal, Amita Dev, Shail Bala Jain
Abstract: In this paper, cepstral features derived from the Differentiated
Relative Higher Order Autocorrelation Sequence Spectrum (DRHOASS) are proposed
for improving the robustness of a speech recognizer in the presence of
background noise. Proposed method is analyzed and compared in terms of the
autocorrelation coefficients they employ with the traditional feature
extraction methods based on Linear Pediction (LP) analysis. LP- based
techniques used are Linear Predictive Cepstral Coefficients (LPCC), Short-Time
Modified Coherence (SMC) and the One-Sided Autocorrelation Linear Prediction
Coefficient (OSALPC). We evaluate the speech recognition performance of the
proposed features on the Hindi isolated-word task and show that the proposed
features show better recognition performance than the features derived from
the robust liner prediction based methods for noisy speech.
Keywords:
Autocorrelation coefficients, Feature vector set, LPCC, SMC, OSALPC
Title of the Paper:
Aircraft
Supersonic Inlet with Dual Control System
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Authors: Alexandru Nicolae Tudosie, Jenica Ileana Corcau
Abstract: The paper deals with an aircraft supersonic inlet with mixed
compression, which has a dual control system, based on the inner total
pressure’s ratio preservation. The authors have identified the inlet’s
gas-dynamic behavior, as well as the main control and controlled parameters.
One has also built the system’s mathematical model, based on system’s
non-linear motion equations; furthermore, one has established, based on some
simplifying hypothesis, the system’s linear non-dimensional model, useful for
further studies, as well as for some similar inlets’ modeling. A system
description based on block diagram with transfer functions was also realized.
Some simulations were also performed, concerning the system’s time behavior
(step response), for different cases of control possibilities.
Keywords:
Supersonic, Inlet, Speed, Flow rate, Control, Shock wave, Pressure ratio, Flap
Title of the Paper:
An Improved DC
Capacitor Voltage Detection Technology and its FPGA Implementation in the CHB-based
STATCOM
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Authors: Xingwu Yang, Jianfei Zhao, Jianguo Jiang
Abstract: In this paper, an improved single multiple-voltage (SMV) detection
technology based on cascaded H-bridge(CHB) multilevel inverter-based static
synchronous compensator (STATCOM) is introduced and it is realized using a
Filed Programmable Gate Array(FPGA) by delay technology. The advantage of the
improved SMV detector is that, it could save a lot of voltage sensors by using
the inverter output voltage to detect the dc capacitor voltage of each
H-bridge unit, meanwhile, it could get their mean value more accurately. Take
into account delay time in detection circuit and control circuit, in order to
transform this detection technology into practice, a novel delay technology is
studied. Based on delay technology, an implementation method of the improved
SMV detector using a FPGA is also introduced. The experimental results prove
its feasibility and practicality.
Keywords:
CHB inverter, static synchronous compensator (STATCOM), dc capacitor voltage
detection, FPGA, delay technology
Title of the Paper:
Motion Control
and Trajectory Tracking Control for a Mobile Robot Via Disturbance Observer
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Authors: Haitian Wang, Ge Li
Abstract: This paper investigates the tracking control of a wheeled mobile
robot in the unknown environment. A disturbance observer is developed with
utilization the integral filter. The proposed control scheme employs the
disturbance observer control approach to design an auxiliary wheel velocity
controller to make the tracking errors, which includes the velocity tracking
error, the angular velocity tracking and the trajectory tracking error vector,
as small as possible in consideration of unknown bounded disturbance in the
kinematics of the mobile robot, and makes use of the disturbance controller to
reject the unknown bounded disturbance. The approximation errors and the
unknown bounded disturbance can be efficiently rejected by employing the
integral filter. A major advantage of the proposed methods is that the
position (or velocity/angular velocity) and the desired trajectory (or
velocity/angular velocity) are no longer necessary. This is because the
observer controller “tracking” both the mobile kinematics and the unknown
bounded disturbance. Most importantly, all signals in the closed-loop system
can be assured to be uniformly ultimately bounded. The system stability and
convergence of the motion control and the trajectory tracking errors are
proved using the Lyapunov stability theory. Simulation results are provided to
verify the proposed control strategy. It is shown that the control strategy is
feasible.
Keywords:
Disturbance observer, Velocity tracking, Trajectory tracking, Time-varying
disturbance, Mobile robot, Motion control, Lyapunov stability
Title of the Paper:
A Principal
Components Analysis Neural Gas Algorithm for Anomalies Clustering
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Authors: Xiufen Fang, Guisong Liu, Ting-Zhu Huang
Abstract: Neural gas network is a single-layered soft competitive neural
network, which can be applied to clustering analysis with fast convergent
speed comparing to Self-organizing Map (SOM), K-means etc. Combining neural
gas with principal component analysis, this paper proposes a new clustering
method, namely principal components analysis neural gas (PCA-NG), and the
online learning algorithm is also given. The soft competitive learning of PCA-NG
is based on local principal subspace, which characterizes the profile of a
certain cluster. We utilize the PCA-NG to the domain of intrusion detection.
Some experiments are carried out to illustrate the performance of the proposed
approach by using a synthetic Gaussian-distributed dataset and the KDD CUP
1999 Intrusion Detection Evaluation dataset.
Keywords:
Intrusion Detection, Neural Gas Network, Principal Component Analysis, Cluster
Analysis
Title of the Paper:
The
Slow-Changing Alarm System of Condition Monitoring for Rotating Machinery
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Authors: Wei Zhong-Qing, Jiang Zhi-Nong, Ma Bo, Zhong Xin
Abstract: This paper mainly deals with the issue of early fault diagnosis for
rotating machinery. An alarm strategy called the slow-changing alarm (SCA) is
proposed to predict early fault of equipment timely and effectively.
Meanwhile, the SCA system is the integration of adaptive lifting de-noising
scheme, adaptive learning algorithm and decision-making strategy of alarm
monitoring and diagnosis for the early fault of rotating machinery. In the
paper, both the theories and realization of SCA system are thoroughly
researched. Firstly, an adaptive lifting de-noising scheme is proposed to
eliminate noise, and then the features of early fault are extracted from
de-noised signal. Secondly, the key problem to implement on the SCA system is
successfully resolved through adaptive learning algorithm and the
decision-making strategy of SCA. To be specific, the alarm threshold of SCA
system is obtained based on a novel adaptive learning algorithm, and the alarm
based on features of vibration signals is activated according to
decision-making strategy of SCA, while the relevant alarm log and data of SCA
are instantly saved into database to analyze the causes of faults effectively,
acquiring the early fault result synchronously. The proposed system has been
applied in some petrochemical projects. In an engineering case, this system
can preferably capture the early fault signal of rotating machinery, and
considerably enhance the capability of predicting and diagnosing early fault.
Keywords:
Rotating machinery, condition monitoring, early fault, adaptive lifting
de-noising scheme, adaptive learning, decision-making strategy, slow-changing
alarm
Title of the Paper:
A Precision
Improvement of Casting Process for Golf Head Manufacturing by Petri Net
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Authors: Wern-Kueir Jehng, Chia-Nan Wang, Ching-Fa Tsai
Abstract: The precision casting and production of titanium alloy golf head is
a complex and low production efficient industry in Taiwan. Due to the
increasing global competition, high energy cost and explosive manpower growth,
the golf head casting industry seek new approaches in the production processes
and manufacturing techniques to improve productivity efficiency. This paper
proposes a modeling tool based on the Petri net formalism to improve shop
floor control of casting. The manufacturing golf head functions involving
workflow processes and operations, scheduling, dispatching and monitoring are
integrated and mapped by the Petri net model. The realistic data from industry
are applied to the model and the results are sound. The overall manufacturing
performance of the work cell can be estimated and improved cyclically to
better performance.
Keywords:
Petri Net, Modeling, Deadlock, Casting
Title of the Paper:
Harmonic Filters
Influences Regarding the Power Quality on High Frequency Electrothermal
Installation with Electromagnetic Induction
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Authors: Raluca Rob, Ioan Sora, Caius Panoiu, Manuela Panoiu
Abstract: This paper presents a study regarding the functioning of a
melting/hardening electrothermal installation with electromagnetic induction
from the point of view of generated harmonics in the power distribution. The
authors made simulations in scope of reducing the effects of the generated
non-sinusoidal regime.
Keywords:
Electrothermal installation, harmonic, static converter, passive filters
Title of the Paper:
Adjoints 2D Hybrid
Boundary Value Systems over Spaces of Regulated Functions
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Authors: Valeriu Prepelita
Abstract: A class of 2D hybrid boundary-value time-variable systems is
studied, in the general approach of the coefficient matrices, states, inputs
and controls over spaces of functions of bounded variation or of regulated
functions. A generalized variation-of-parameters formula is obtained for
differential-difference equations of the considered type and it is used to
derive the formul? of the state and of the output of these systems. The state
space representation of the adjoints of these 2D hybrid systems is introduced
and their input-output map is obtained. The duality between the 2D hybrid
boundary-value systems and their adjoints is expressed by the means of two
bilinear forms.
Keywords:
2D continuous-discrete systems, input-output map, regulated functions,
functions of bounded variation, semiseparable kernels, realizations
Title of the Paper:
One to One
Recommendation System for Apparel Online Shopping
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Authors: Teruji Sekozawa
Abstract: Clients who visit an apparel marketing website but have little
previous knowledge of fashions tend to have difficulties selecting clothes
that suit their tastes. Faced with an immense number of products on display,
they can become quite confused and even hesitate to make any selections at
all. This study proposes a system that supports online purchases of garments
with functions to select and recommend garments on the basis of the customer’s
tastes. The system has three basic capabilities: (1) It analyzes the
customer’s tastes using the analytical hierarchy process (AHP) and selects and
suggests clothes. (2) It designates a priority for suggesting the garments
using correlations found by clustering. (3) It suggests second purchases of
items that have been chosen by previous customers with similar tastes who
bought a garment that the current online customer has just decided to buy. The
second purchases are selected using market basket analysis. Two databases are
essential to this process: one for the attributes of garments and one for
simultaneous purchasesof garments.
Keywords:
Analytical hierarchy process, Online shopping, One-to-one, Recommendation
system, Coordination, Market basket analysis
Title of the Paper:
Determination
of Temperature Field Distribution and Rate of Heat Transfer by Means of
Thermal-Electrical Analogy in DC Machine
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Authors: Otilia Nedelcu, Diana Enescu, Cornel Salisteanu
Abstract: In this paper is presented an analysis method of electrical
circuits, more exactly nodal method, in order to compute the temperature field
distribution necessary to the heating and ventilation systems of electrical
machine. As analysis method, the modified nodal method was used which does not
impose any restriction at the circuit structure, being a prevalence of the
nodal method. For this reason, this method was used in the analysis rogramme
of circuits called SPICE. In the software application called NAPACI, authors
analyses the temperature field distribution and the rate of heat transfer
which are necessary for a complete study to range of the temperature in steady
state. This analysis supposes the knowledge and the localization of
temperature losses values, determination of the rate values of heat transfer
and their distribution in different sides of electrical machine. Comparing the
results obtained by means of other two programmes NAPACI and SPICE, it can be
observed that these results are identical.
Keywords:
DC machine, steady-state, temperature field, rate of heat transfer, thermal
resistance, generated power, consumed power, NAPACI programme
Issue
2, Volume 9, February 2010
Title of the Paper:
Evaluating the
Adoption Level of Electronic Customer Relationship Management by
Telecommunication Companies
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Authors:
Noor Raihan Ab Hamid, Fauziah Ahmad, Saharbudin Naim Tahir Shah, Noor Habibah
Arshad
Abstract: Although Customer Relationship Management is no longer a buzz word
in businesses today the application continues to play an important in
enhancing firms’ competitiveness. At a general level, competition in
cyberspace is becoming more intense. With vast information available at the
click of the mouse, consumers may easily switch at low cost, thus gaining
higher bargaining power in the electronic marketplace. In turn, companies have
no choice but to rethink their marketing strategies in order to retain
customers. Apparently, one of the ways to gain higher market share companies
have sought to use information technology to learn the needs and preferences
of their customers – building log-term relationships. This study attempts to
investigate the extent to which companies utilize the Internet technology to
help build customer relationships. This study aimed to assess the usage level
of Electronic Customer Relationship Management (E-CRM) tools by
telecommunication companies. The results indicated that companies are
indifferent in their levels of usage for informational and transactional tools
but are significantly different in the adoption of relational tools. We
discuss the results and suggest some directions for future research.
Keywords:
Electronic CRM, Internet-marketing, Telecommunication companies, Relationship
marketing, Customer loyalty, Customer satisfaction, Retention
Title of the Paper:
Using Logistic
ReDesigner (Lo.R.D.) Software for Designing and Simulating a Steel Supply
Chain
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Authors:
Enrico Briano, Claudia Caballini, Roberto Mosca, Roberto Revetria
Abstract: This paper regards the analysis of the development of a logistics
and transportation network concerning a steel plant. The main goal is to
search for the best scenario that allows to supply the plant and to distribute
all the finished products to final customers in the most efficient way. To
this aim, a proper simulation model has been developed and implemented
utilizing Logistics Re Designer (Lo. R. D.) software. More specifically, three
different transportation networks have been created: two “single” modal choice
scenarios - by road or by rail – and an “intermodal” one. Another system
variable regards the production capacity of the steel plant: three different
types of capacity have been considered; so in total nine scenarios have been
taken into consideration. The results obtained indicate that the intermodal
solution is the most suitable to be adopted both in terms of total time – and
consequently costs - and resources required to perform all the necessary
operations. Future research will focus on the improvement of the solution
found and on the development of an economical analysis.
Keywords:
Intermodality, supply chain design, simulation, network saturation, steel
plant, Lo.R.D. software
Title of the Paper:
Objectives and
Perspectives for Improving Resiliency in Supply Chains
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Authors:
Enrico Briano, Claudia Caballini, Pietro Giribone, Roberto Revetria
Abstract: This paper aims at providing the key aspects regarding vulnerability
of supply chains and the way to make them more resilient. After having
identified the most common threats affecting supply chains integrity, the
success factors to build a resilient supply chain are provided. For instance,
in the fashion goods context, particular phenomena cause unpredictable
behaviours in the demand, so generating vulnerability in the relative supply
chain. A KPIs methodology for studying the behaviour of these supply chains
under these phenomena is proposed. his research represents the basis for a
future work that will end up with the elaboration of a System Dynamics model
able to reproduce the most significant dynamics of short life cycle products,
such as electronic devices, with the goal of providing innovative solutions to
make this kind of supply chains more resilient.
Keywords:
Vulnerability, Resiliency, Risk Management, Supply Chain, KPIs, Fashion goods
Title of the Paper:
Implementation
and Interaction Issues in Digital Music Libraries
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Authors:
Dimitrios Margounakis, Dionysios Politis
Abstract: The digital format of music led to the necessity of creating big
music libraries in the Internet, which provide the user with great
possibilities of acquiring and listening to music. These Digital Music
Libraries (DMLs) should fulfill the user communities’ needs. Since DMLs do not
deal with pure text, but with sound and its several representations, special
treatment is needed during their development. This paper presents the crucial
issues concerning the implementation of a DML and the user-DML interaction.
The implementation issues are categorized in a useful framework taking into
account the keys of success of the most popular DMLs worldwide, while the
interaction issues are applied on MELIRIS music repository.
Keywords:
Digital Music Libraries, Music Search, Interaction, Computer Music Interfaces,
Music Database
Title of the Paper:
Vehicle
Mathematical Model Reduction Considering the Brake System Dynamics
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Authors:
I. Vazquez-Alvarez, J. J. Ocampo-Hidalgo, C. Aviles-Cruz, A. Ferreyra Ramirez
Abstract: The present work shows a complete model for longitudinal movement of
an automobile, starting with the reference coordinate systems; an inertial
system, a system considering the vehicle as a rigid body and different
coordinate systems for considering the center of mass of the tire and the
contact element. Then the dynamics for subsystems involved in the braking
process are described. The interest of the model is around the maximum value
of the contact force, which physically means that the wheel is closed to a
block situation. After this we obtained the characteristic values for every
subsystem, and the model is evaluated for a metropolitan transport bus,
Finally, considering the constant time for changes on the angular velocity as
characteristic time we apply the fractional analysis to obtain a reduced order
model of a vehicle, for the simulation the parameters of a bus were considered
and the result the dynamics with enough accuracy for the conditions
considered.
Keywords:
Mathematical model, Vehicle, Brake system, Fractional analysis, Model
reduction
Title of the Paper:
Overview on
System Integration Projects Management: Risk Mitigation, Lesson Learned,
Pitfall Avoidance and KPI Evaluation
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Authors:
Francesco De Maria, Chiara Briano, Matteo Brandolini
Abstract: This paper discusses about methodologies for governing and managing
projects of system integration, providing a new way of considering such
projects’ lifecycle avoiding common pitfalls. In this work Authors provide an
overview of common issues in complex IT projects, focusing in particular on
criticalities derived from such projects and proposing simple solutions on the
basis of experiences and studies led on big System Integration projects
involving international companies.
Keywords:
ERP Enterprise Resource Management, ECC (ERP Central Component), SOA (Service
Oriented Architecture) Modelling, customer behaviour, forecasting revenues,
Key Performance Indexes
Title of the Paper:
Mechanical
Analysis of a Vertical Scanning System for 3D Images Acquisition with
Microcontroller-based Electronic Design
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Authors:
J. Armando Segovia, Alberto Contreras, Mayra P. Garduno
Abstract: Herein are presented in detail the tasks that were developed to
carry out a project that had as aim updating and improving the perception
system of a Pioneer 3-AT mobile robot to enhance its navigation control by
means of a mechanical system to let a laser range finder scanning and
acquiring 2.5D and 3D images of the robot’s environment. The system developed
is a mechanism that is able to put in start position and to tilt automatically
a laser range finder LMS200 with high precision, because the range of
repetitive accuracy is very important to get good images. This precision was
obtained with the aid of different parts that work together and with the best
performance into its correspondent area; electronic area (control and
communication circuits), mechanical area (stepper motor and mechanical design)
and informatics area (acquisition and data processing). The system was
developed to be an inexpensive device, using the most common elements, as a
Microchip’s microcontroller, which are easy to program and there are many
models to choose the one that could fit our needs and budget, small elements
and many job features, for example the PWM module, communication ports by
USART and USB, and A/D channels, very important characteristics to control a
stepper motor.
Keywords:
3D Scanner, Telemeter, Microcontroller, Navigation, mobile robot, Stepper
Motor, LMS200 Laser Range Finder
Title of the Paper:
Particle Swarm
Optimization Models Applied to Neural Networks using the R Language
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Authors:
Nuria Gomez, Luis F. Mingo, Jesus Bobadilla, Francisco Serradilla, Jose A.
Calvo Manzano
Abstract: There exists a clear difference between cooperative and competitive
strategies. The former ones are based on the swarm colonies, in which all
individuals share its knowledge about the goal in order to pass such
information to other individuals to get optimum solution. The latter ones are
based on genetic models, that is, individuals can die and new individuals are
created combining information of alive one; or are based on molecular/celular
behaviour passing information from one structure to another. A Grammatical
Swarm model is applied to obtain the Neural Network topology of a given
problem, training the net with a Particle Swarm algorithm in R. This paper
just shows some ideas in order to obtain an automatic way to define the most
suitable neural network topology for a given atter set. High dimension problem
is also mentioned when dealing with the particle swarm algorithm.
Keywords:
Social Intelligence, Neural Networks, Grammatical Swarm, Particle Swarm
Optimization
Title of the Paper:
Energetic
Instability of a Fractional Oscillator
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Authors:
Astrid Rekker, Romi Mankin
Abstract: We explore the problem of memory-enhanced stability occurring in a
fractional oscillator with fluctuating eigenfrequency when the oscillator is
driven by external sinusoidal forcing and by an additive internal fractional
noise with a power-law type memory. It is established that at intermediate
values of the memory exponent the energetic stability of the oscillator is
significantly enhanced. We show that, by conveniently choosing the system
parameters, the output signal–to–noise ratio is a double peaked function of
the memory exponent, thus demonstrating the phenomenon of memory controlled
stochastic multiresonance. The connection between the occurrence of energetic
instability and the phenomenon of memory-induced multiresonance is
established.
Keywords:
Fractional oscillator, stochastic resonance, fractional noise, white noise,
energetic instability, viscoelastic friction
Title of the Paper:
Multi-Robot
Map Alignment in Visual SLAM
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Authors:
Monica Ballesta, Arturo Gil, Oscar Reinoso, Miguel Julia, Luis M. Jimenez
Abstract: This paper focusses on the study of the Map Alignment problem in a
multirobot SLAM context. Given a team of robots, we consider the situation in
which each robot is building its own local map independently. These maps are
landmark-based and three-dimensional. The local maps built by the different
robots will have different reference systems. At some point, it may be
interesting to express all maps in the same reference system. In that way, the
maps can be fused into a unique global one. This is known as the map fusion
problem and can be tackled by dividing the problem into two subproblems: map
alignment and map merging. In this paper, we concentrate on the map alignment
problem which consist on computing the transformation between the local maps
so that we have one reference system. We therefore evaluate a set of aligning
methods. These methods establish correspondences between each pair of maps and
compute an initial estimate of the alignment. Finally, we apply the least
squares minimization to obtain a more accurate solution. We also concentrate
on the case in which we want to align more than two local maps. In this case,
the alignment must be globally consistent. For the experiments, real data are
used. Each robot extracts distinctive 3D points from the environment with a
stereo camera. Then, the robots use these observations as landmarks to build
their maps while simultaneously localize themselves. The SLAMproblem is solved
using the FastSLAM algorithm. The movements of the robots occur only in 2D
plane, so although the maps are 3D landmark-based, the alignment takes place
only in 2D.
Keywords:
Multirobot visual SLAM, Map alignment, visual landmarks
Issue
3, Volume 9, March 2010
Title of the Paper:
Near Border
Procedures for Tracking Information
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Authors:
Jouni Viitanen, Markus Happonen, Pasi Patama, Jyri Rajamaki
Abstract: European integration has increased the transport of illegal goods
and other criminal activity. Therefore the transmitting of tracking and other
status information between nations and different organizations should become
an everyday business. The goal of this paper is to find possible bottle necks
in international cooperation between authorities and to find possible
solutions for them. The following area can be considered as a part of the
Finnish SATERISK research project that aims for a situation where laws on
positioning and tracking and the financial risks posed by their usage will not
prevent the use of m2m tracking across state and union borders. The target of
the paper is to present administrative and technical solutions to improve
multiorganizational tracking solutions. Namely, the goal is to make it
possible to create a timely situational picture in joint multinational and
interagency operations. This paper will provide guidance for preparing
appropriate plans and doctrine proposals for joint operations and training.
Also technical solutions and bottlenecks are briefly covered in this paper.
Keywords:
Borders, Doctrines, Interfaces, Navigation, Positioning, Satellite
navigations, Tracking
Title of the Paper:
Mixed Traffic
Models for Dimensioning Radio Resources in GSM/GPRS Networks
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Authors:
Cornel Balint, Georgeta Budura, Adrian Budura
Abstract: Dimensioning radio resources in GSM/GPRS networks is particularly
important because of the presence of mixed traffic: voice and data.
Appropriate models are required especially when the implemented resources
allocation strategy is Partial Partitioning. In this paper we propose three
mixed traffic models suitable for dimensioning cells using PP scheme. In order
to validate our models we define and compare several performance parameters:
blocking probability for voice, throughput (total and per user), cell
utilization and blocking probability for data. The models based on combined FR
and HR voice traffic technique and the DHR voice technique implement an
optimal use of resources based on half-rate mobiles capability and re-packing
mechanisms. The mixed models we proposed could be used for dimensioning radio
resources in GSM/GPRS networks in order to ensure the adequate QoS level for
each type of service according to the voice and data traffic loads.
Keywords:
GSM/GPRS, mixed traffic model, Erlang-B law, blocking probability, Engset law,
throughput
Title of the Paper:
System
Approach to Determinants of Quality of Life within a Region
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Authors:
Pavel Jirava, Jan Mandys, Miloslava Kasparova, Jiri Krupka
Abstract: The submitted article deals with the problematic of the quality of
life and factors which can influence it. On the basis of previous research we
know that this is a complex problem which is characterized by a huge number of
components and connections among them. We focused on the main areas which
influence the quality of life and tried to describe the connections among
them. The goal of this paper was not the experimental examination based on
real data; however, creation of a framework and a basis for the future quality
of life research in a region which should cover – if possible – all the main
indicators of the quality of life and link to our previously realized
researches in this area.
Keywords:
Quality of life, environment, health, life style, region, human life
Title of the Paper:
Design
Methodology Based on H-infinity Control Theory for Marine Propulsion System
with Bumpless Transfer Function
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Authors:
M. J. Lopez, L. Garcia, J. Lorenzo, A. Consegliere
Abstract: In this paper we propose a control system design methodology which
has two main objectives: the first one is to achieve control system
specifications for a local H? controller designed for a given operation
condition, and the second objective is to provide a procedure for bumpless
transfer (BLT) when the controller is switched to another one, due to change
in the operation condition, or when the controller is retuned by a plant
operator. For that, the design procedure calculates a feedback H-controller (FB-HC)
and an associated bump-less transfer H-controller (BLT-HC). The method is
implemented in an auto-tuning procedure, where both pretuning controllers (FB-HC
and BLT-HC) are obtained in a systematic manner. Controllers fine-tuning can
be carried out by a plant operator using two tuning parameters and several
tuning rules. Our design methodology is applied to a marine propulsion system
with diesel engine used as propeller prime-mover. Due to different operation
regimens of ship propulsion, several linear controllers are designed for
different operating points, switching (with bumpless-transfer) between them
when is necessary; which enables the system to be controlled satisfactorily
within the whole of its operating range. Satisfactory results are obtained by
simulations with the nonlinear model of a merchant ship, and our hardware in
the loop simulation (HILS) environment is described.
Keywords:
Ship propulsion system, H controller, bumpless transfer
Title of the Paper:
Computer
Simulation and Method for Heart Rhythm Control Based on ECG Signal Reference
Tracking
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Authors:
M. J. Lopez, A. Consegliere, J. Lorenzo, L. Garcia
Abstract: In this work we use computer simulations to test a method for
controlling heart rhythm behavior based on the electrocardiogram (ECG) signal
tracking. The proposed control algorithm is based on two parameters, the
controller proportional gain and the norm of tracking error signal. The
objective is to take out the heart rhythm dynamics from a non desirable
situation to a normal specified behavior, which is given by a signal generated
by a reference system. Computer simulations are carried out using as process
to control a mathematical model (MS1) composed with six differential delayed
equations (DDE), which, depending on model parameters, provides different
dynamical behaviors, from normal behavior to non desirable performances
interpreted as cardio-pathologies. In order to generate an specified normal
ECG reference signal, it is used MS1 with normal behavior parameters, and as
alternative model, it is used a third order nonlinear dynamical system (MS2),
which produces specific statistics such as the mean and standard deviation of
the heart rate and frequency-domain characteristics of heart rate variability
(HRV). By means of the proposed control law application, the heart rhythm is
conduced to a neighborhood of the specified behavior and satisfactory results
are obtained in numerical simulations with both reference models.
Keywords:
Control law, heartbeat control, simulation, chaotic behavior, synchronization
Title of the Paper:
Markov
Approach of Adaptive Task Assignment for Robotic System in Non-Stationary
Environments
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Authors:
Gabriela Tont, Luige Vladareanu, Mihai Stelian Munteanu, Dan George Tont
Abstract: Adaptive and decentralized task assignment in non-uniform and
possibly even non-stationary conditions with the aim of ensuring stability is
especially challenging knowledge requirements in order to negotiate within and
interact with uncertain and dynamic environments such as robot malfunctions or
error propagation. Task assignment addresses to the problem of coordination
both in on autonomous and interacting robot. In the scenarios for task
assignment robots are embedded in the environment, there are strict
constraints on communication, and most importantly tasks that robots should
execute are perceived by the robot itself during the mission execution, thus
conflicts on the task assignment process might arise. The internal
representation of timing constraints on interaction has many implications for
the reliability, effectiveness, efficiency, validity, schedulability and
robustness of the mobile robot. The task assignment processes and its control
implying reasoning about objects and resources and their changing states are
dominated by either discrete or stochastic-event dynamics or both.
Stationarity is an unrealistic prior assumption for the multi-state components
of complex systems. The numerical characteristics of the nonstationary random
responses of complex structure are developed in the paper considering the
uncertainty and volatility of process transitions states. The appropriate
functional levels of multi-state systems components are placed between the two
extremes: defect (0%) and the nominal (100%) state, allowing any intermediate
state transiting from the range of perfect functionality to complete failure.
Time analysis interval of a multi-state system is characterized by
intermediate states (states of partial success). The paper proposes a
stochastic model of assessing system probability of unidirectional or
bidirectional transition states, applying the non-homogeneous (non-stationary)
Markov chain. The capability of timedependent method to describe a multi-state
system is based on a case study, assessing the operatial situation of robotic
system. The rationality and validity of the presented model are demonstrated
via an example of quantitative assessment of states probabilities of an
autonomous robot.
Keywords:
Petri nets, Fuzzy sets, mobile robots, non-stationary discrete event, dynamic
systems, reasoning
Title of the Paper:
Algorithms for
Estimation in Distributed Parameter Systems Based on Sensor Networks and ANFIS
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Authors:
Constantin Volosencu
Abstract: This paper presents some algorithms for estimation of the state
variables in distributed parameter systems of parabolic and hyperbolic types.
These algorithms are expressed on regression using anterior values of adjacent
state variables and on auto-regression using the anterior values of the same
variable. The momentary values may be obtained using sensors from a network
placed in the field of the distributed parameter systems. The computation of
the estimates is done using the adaptive-network-based fuzzy inference scheme.
The structure of the ANFIS is derived based on training using measured values
obtained form the sensor network. The algorithms and the method of estimation,
emerged from three powerful concepts as theory of distributed parameter
systems, artificial intelligence, with its tool adaptive-network-based fuzzy
inference and the intelligent wireless ad-hoc sensor networks allow treatment
of large and complex systems with many variables by learning and
extrapolation. They have applications in monitoring, fault estimation,
detection and diagnosis of large and complex physical processes. The paper
presents some case studies as applications of all four algorithms.
Keywords:
System identification, fault detection and diagnosis, wireless sensor
networks, non-linear system identification, distributed parameter systems,
adaptive-network-based fuzzy inference
Title of the Paper:
Aspects of
Thermal Power Plant Automation
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Authors:
Marius-Constantin Popescu, Nikos Mastorakis
Abstract: Thermal electric power plant is a set of facilities/equipment
interconnected, designed to produce electricity or heat and power, by
converting chemical energy of a fuel. This paper analyze the energy production
stations, both turbine and steam generator in order to highlight the
constructive and functional aspects of the energy transformations taking place
in such centers.
Keywords:
Modeling and Simulation, The Ovation System
Title of the Paper:
Towards a
Possibilistic Classification of Gastroenterology Patterns in a Complex
Environment
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Authors:
Anas Dahabiah, John Puentes, Basel Solaiman
Abstract: In this paper, several types of imperfection and uncertainty that
may affect the information elements in any pattern recognition system will be
pondered, whether when object classification depends on datasets, or when it
relies on expert knowledge sets. Afterwards, all the discussed imperfection
aspects will be processed within a unified framework, fundamentally based on
possibility theory and fuzzy relation composition rules. At last, various
concrete illustrative examples applied to gastroenterology patterns will be
given and discussed.
Keywords:
Possibility Theory, Fuzzy Relation Composition, Information Imperfection and
Uncertainty, Knowledge Base
Title of the Paper:
A Novel CMOS
1-bit 8T Full Adder Cell
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Authors:
Tripti Sharma, K. G. Sharma, B. P. Singh, Neha Arora
Abstract: The 1-bit full adder is a very important component in the design of
application specific integrated circuits. Demands for the low power VLSI have
been pushing the development of design methodologies aggressively to reduce
the power consumption drastically. In most of the digital systems adder lies
in the critical path that affects the overall speed of the system. So
enhancing the performance of the 1-bit full adder cell is the main design
aspect. The present study proposes a novel CMOS 1-bit full adder cell with
least MOS transistor count that reduces the serious problem of threshold loss.
It considerably increases the speed and also proves best for high frequency
applications. Result shows 45% improvement in threshold loss problem and
considerable reduction in power consumption over the other types of adders
with comparable performance. The simulation has been carried out on Tanner EDA
tool on BSIM3v3 90nm and 130nm technologies.
Keywords:
Full adder, high speed, low power, power-delay product, XOR gate, VLSI
Issue
4, Volume 9, April 2010
Title of the Paper:
Resiliency and
Vulnerability in Short Life Cycle Products' Supply Chains: a System Dynamics
Model
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Authors:
Enrico Briano, Claudia Caballini, Pietro Giribone, Roberto Revetria
Abstract: The work is focused on the study of a supply chain related to short
life-cycle products, that are goods produced and sold for a limited period of
time like fashion goods, electronic devices, health care service and
particular foodstuffs. The case study belongs to the last one category and
regards a particular good produced by an important Italian food company, with
several branches all over the world, operating in the field of snacks,
biscuits and bread substitutes. Currently the data in the simulation model are
assumed by the authors due to a delay on the provision, but the real company
data should be available, properly modified for reasons of confidentiality,
for the extended version of the paper. In the following sections a simulation
model, implemented using the System Dynamics methodology, will be described.
System Dynamics approach is suitable for complex dynamic systems like the one
object of this work; this methodology considers in fact time delays and
feedback loops, which heavily affect the system structure and behavior. The
model has been implemented using one of the most known System Dynamics
commercial software: Powersim Studio™, because of its flexibility and
completeness, allowing also integration with databases, external files and ERP
systems. The aim of the simulation is to identify and focus on the
criticalities along the supply chain in order to minimize the total costs and,
consequently, maximizing the company profits.“What If” analysis have been
carried out in order to show which is the best policy to adopt in terms – for
instance – of safety stock or demand planning. Moreover, the concepts of
vulnerability and resiliency applied to these kinds of supply chains have been
analyzed. After a short classification of threats and risks for supply chains,
the case in which an environmental risk (an earthquake) occurs, striking the
raw material supplier, is modeled and simulated with the System Dynamics
methodology. The obtained results show that with a more resilient supply
chain, characterized by the procurement from two different suppliers (instead
on only one) located in different geographical areas, business continuity is
guaranteed even in the case of a natural catastrophe.
Keywords:
Short life-cycle products, simulation, supply chain management, System
Dynamics, Powersim Studio, vulnerability, resiliency
Title of the Paper:
Study of an
Emergency Situation Using 2D and 3D Simulation Models
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Authors:
Enrico Briano, Claudia Caballini, Roberto Mosca, Roberto Revetria, Alessandro
Testa
Abstract: Safety in motorway tunnels has become a critical issue in the last
years, especially after the accident happened in 1999 inside the Mont Blanc
tunnel, causing 39 deaths and several dozens of intoxications and wounded
people. After this tragic event, the European Union imposed stricter
regulations and procedures for emergency situations inside road tunnels longer
than 1000 m. According to this situation, the authors propose the use of M&S
(Modeling and Simulation) in order to manage a tunnel evacuation after a fire
exploding in consequence to an accident, taking into account a series of
significant factors like the road signs position (new criteria have been
introduced with new regulation), but also human factors which significantly
affect the procedure outcome. First a 2-D simulation model has been developed
using Java™ Software, in which the user can analyze the behavior of the people
escaping and the dynamics of the fire exploded and, consequently, assess the
effectiveness of all the emergency procedures and infrastructures. In
particular, regarding the state variables related to the human behavior, the
model takes into account the main aspects of PECS (Physical Emotional
Cognitive Social) reference models, in which physical, emotional, cognitive
and social factors have to be studied. The model presented in this work is in
fact quite similar to the one described by (Schmidt, 2000), called “Adam’s
World” [1] where Adam, a primitive man, lives in an environment having food
sources where he can replenish his energy level, but also traps and danger
points to be avoided in order not to consume his energy faster. The aim of the
two models is the same: first of all preserve life and health, but the great
difference between Schmidt’s model and the authors’ one is that in Adam’s
World the social aspect is missing (Adam live alone in his world), while in
the evacuation model social aspects can significantly affect the individual’s
decisions. Upstream of the evacuation model, a weighted analysis needs to be
considered, in fact the individual has to operate different choices
considering several aspects, like health or goods preservation, familiar
aspects, panic and so on. For this reason a suitable methodology has been
detected: the Analytic Hierarchic Process (AHP), implemented by the American
mathematician Thomas Saaty, which introduced this technique for Multi-Criteria
Analysis. After the considerations on the individuals behavior based on the
results of the analysis, the evacuation model and its results are described
and analyzed in the following sections and, in the final part of the paper, a
description of a 3-D tunnel model devoted to study in particular smoke
dynamics is provided, thus it is possible to evaluate the impact of the smoke
on the flow of the people escaping from the tunnel.
Keywords:
Emergency Procedures, Simulation, PECS Models, AHP, Human Behavior
Title of the Paper:
Shunt Active
Power Filter Design using Genetic Algorithm Method
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Authors:
K.-L. Areerak, T. Narongrit
Abstract: This paper deals with the active power filter design controlled by
using hysteresis technique. The genetic algorithm is used to design the
controllers to minimize the %THD of the source current. The results are
compared with that designed from Ingram and Round approach. The simulation
results confirm that the genetic algorithm can provide the minimum %THD of the
source current compared with the Ingram and Round method. The %THD also
follows the IEEE std.519-1992.The design of the active power filter based on
the genetic algorithm is flexible and can improve the performance of the
filter.
Keywords:
Genetic algorithm, hysteresis control, harmonic elimination, active power
filter
Title of the Paper:
Contribution
of the Delay Differential Equations to the Complex Economic Macrodynamics
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Authors:
Andre A. Keller
Abstract: In some cases of the economic macrodynamics, delay differential
equations (DDEs) may be more suitable to a wide range of economic models. The
dynamics of the Kalecki’s business cycle model is represented by a linear
first-order DDE with constant coefficients, in the capital stock. Such a DDE,
with constant or flexible lags, also occurs in the continuous time Solow’s
vintage capital growth model. This is due to the heterogeneity of goods and
assets. DDEs with constant lags may be preferably solved by using Laplace
transforms. Numerous techniques are also proposed for the solution of DDEs,
like the inverse scattering method, the Jacobian elliptic function method,
numerical techniques, the differential transform method, etc. This study
retains the Zhou’s differential transform method for solving nonlinear DDEs
with backward-foreward delays and flexible coefficients. This study also uses
a block diagram approach with application to reference economic models, with
help of the software MATHEMATICA 7.0.1 and its specialized packages for signal
processing, such as ”Control System Professional” and ”SchematicSolver”.
Keywords:
Delay differential equation, Method of steps algorithm, Differential transform
method, Laplace transform solution, (x,k)-root plateau
Title of the Paper:
Fuzzy Bimatrix
Games with Single and Multiple Objective: Introduction to the Computational
Techniques
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Authors:
Andre A. Keller
Abstract: This paper introduces to the computational techniques of
non-cooperative bimatrix games in an uncertain environment. Both single and
multiple objective fuzzy-valued bimatrix games are considered theoretically
with one numerical example. The presentation is centered on the Nishizaki and
Sakawa models. These models are based on the maxmin and minmax principles of
the classical matrix game theory. Equivalent nonlinear (possibly quadratic)
programming problems are giving optimal solutions. The equilibrium solutions
correspond to players maximizing a degree of attainment of the fuzzy goals.
Besides the Nash equilibrium, the concept of -Nash equilibrium supposes Nature
be the third Player. The aggregation of all the fuzzy sets in the
multiobjective models use the fuzzy decision rule by Bellman and Zadeh. This
‘aggregation by a minimum component’ consists in the intersection of the fuzzy
sets, the fuzzy expected payoffs and the fuzzy goals. Numerical examples of
two-players nonzero sum games are solved using the MATHEMATICA 7.0.1 software.
The numerical solutions are possibly local by using iterative methods.
Keywords:
Fuzzy bimatrix game, Single-objective, Multiobjective, Degree of attainment of
a fuzzy goal, Quadratic programming
Title of the Paper:
Robust
Analysis of Uncertain Dynamic Systems: Combination of the Centre Manifold and
Polynomial Chaos theories
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Authors:
L. Nechak, S. Berger, E. Aubry
Abstract: A new methodology for a robust analysis of uncertain nonlinear
dynamic systems is presented in this paper. The originality of the method
proposed lies in the combination of the centre manifold theory with the
polynomial chaos approach. The first one is known to be a powerful tool for
model reduction of nonlinear dynamic systems in the neighbourhood of the Hopf
bifurcation point while the polynomial chaos approach is an efficient tool for
uncertainty propagation. Therefore, to couple the two methods can help to
overcome computational difficulties due to both the complexity of nonlinear
dynamic systems and the cost of the uncertainty propagation with the
prohibitive Monte Carlo method. The feasibility and efficiency of the proposed
methodology is investigated. So, a two degree of freedom model describing a
drum brake system subject to uncertain initial conditions is considered.
Keywords:
Nonlinear dynamic System, Model Reduction, Centre Manifold, Robust Analysis,
Uncertainty Propagation, Polynomial chaos, Non-intrusive methods
Title of the Paper:
Simulation
Models for Back-Office & Retail Store Management Integration in ERP
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Authors:
Francesco De Maria, Chiara Briano, Matteo Brandolini, Enrico Briano, Roberto
Revetria
Abstract: The paper describes shortly the architecture of a complex system for
managing back office activities and store management including MRP, Demand
forecasting, stock evaluation system from the logistics and financial point of
view, integrated in a company ERP. Simulation was the way to properly define
the most suitable algorithm for demand forecasting among the many complex
combinations proposed by default in the ERP Central Component plus the ones
proposed by key users. This architecture was applied in a complex retail chain
involving different classes/clusters of point of sales and selling many
different sorts of goods (grocery, food, clothing, electronics, home goods
etc.)
Keywords:
ERP Enterprise Resource Management, ECC (ERP Central Component), SOA (Service
Oriented Architecture) Modelling, customer behaviour, forecasting revenues,
Key Performance Indexes
Title of the Paper:
Design a
Moodle Synchronous Learning Activity
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Authors:
Lung-Hsing Kuo, Te-Hsiung Tseng, Hung-Jen Yang, Hsieh-Hua Yang
Abstract: Moodle is a famous open source Course Management System, but this
system could only provide limit synchronous communication service through
keyboard chatting. So the purpose of this study was to development a Moodle
synchronous learning activity module to establish adobe video conference
meeting. Based upon the Moodle developer guide and Adobe Acrobat Connect Pro
server guide, this study designed a Moodle & Adobe Acrobat Connect Pro bridge
unit and defined the correspondence between Moodle roles to Adobe Acrobat
Connect Pro principals. Based on the proposed Module, Moodle really will use
for full online classes as well as supplementing “face-to-face” learning and
help students to improve their learning progress.
Keywords:
Moodle, Course Management System, Rich Internet applications, XML
Title of the Paper:
Water
Desalination Plants Performance Using Fuzzy Multi-Criteria Decision Making
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Authors:
Mohammed A. Hajeeh
Abstract: Countries which do not have adequate supply of freshwater sources
like Kuwait resort to using desalination plants to meet their demand. Kuwait
had used Multi-flash desalination (MSF) plants sine the 50’s of the last
century to satisfy its ever increasing demand. Many new and more efficient and
cost effective desalination technologies are currently available. Kuwait is in
the process of building new desalination plants, and has to seize this
opportunity to consider using other desalination technologies instead of MSF
plants. In this work, an attempt to make to bring to the attention to the
decision maker the performance and suitability of the different technologies
using a fuzzy multi-criteria decision making technique. The preference is
based on six criteria (factors) for comparing three commercially available
desalination technologies, i.e., Multi-stage flash (MSF), Multi-effect
desalination (MED), and Reverse osmosis (RO). The study found that the amount
of energy used in these plants should be most important selection criteria
followed by the amount of pre-treatment required. The most preferred
technology is RO according to this study.
Keywords:
Freshwater, Decision maker, Preference, Reverse osmosis, Multi-stage flash,
Multi-effect desalination
Title of the Paper:
Knowledge-Intensive
Services: New Leader of Production Stages?
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Authors:
Zuzana Tuckova, Jiri Strouhal
Abstract: At the end of the previous century we were introduced to the notion
of mass customization - an approach to manufacturing that synchronizes the
benefits of mass production to the benefits of tailoring each product to an
individual’s requirements. The underlying “technologies” that support mass
customization are a combination of modular design approaches and information
technology. Modular design allows us to create a very large number of
varieties of a particular product with varying characteristics. Tailoring
products to individual requirements means having detailed information about
individual customer requirements and the knowledge. This allows us to identify
how to satisfy them.
Keywords:
Services, Knowledge Management, Knowledge Intensive Services, Czech Republic,
Service Management, Accounting Profession
Title of the Paper:
Effects of Humidity
and Fog Conductivity on the Leakage Current Waveforms of Ceramics for Outdoor
Insulators
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Authors:
Suwarno, J. Parhusip
Abstract: Since long time ago, ceramic insulators are widely being used in
power systems. The performances of the insulators such as surface resistance
and flash over voltages greatly affected by environmental conditions such as
pollution and humidity. The pollution may arise in the form of fogs. A large
leakage current (LC) may flow on the surface and degradation may take place.
In long term the degradation may lead to the flash over of the insulators.
This paper reports the experimental results on the effects of humidity and fog
conductivity on leakage current characteristics of ceramics. The samples used
are blocks of ceramics with dimension of 250 x 50 x 20 mm3. The samples were
made from same materials for outdoor ceramic insulators. The samples were put
in a test chamber with controlled humidity and artificial pollution
conditions. AC voltage with frequency of 50 Hz was applied. The magnitudes as
well as harmonic content of the LC were analyzed. The experimental results
indicated that under clean fog, LC magnitude almost linearly increased with
applied voltage at low and medium RH. At high RH, LC magnitude drastically
increased compared to those of low RH. At low RH the dominant harmonics number
are 5th , 3 rd and 7th with relatively large amplitude while at medium and
high RH the dominant harmonic components of the LC waveforms are 5th and 3rd
with smaller amplitude compared to it fundamentals resulting in smaller THD.
Under fog condition, LC magnitude increase with fog conductivity. Compared to
the LC magnitude under clean fog, the LC magnitude under salt fog was much
higher than those from clean fog. At high fog conductivity the oscillation
behaviour of LC magnitude dependence on applied voltage was observed due to
the wetting effect of sample surface by the fog and drying effect caused by
the higher LC. The THD of leakage current under salt fog increased with the
applied voltage. LC amplitude increases with applied voltage and RH. LC
waveforms distortion significantly decreased with the salt fog conductivity
resulting in smaller THD. At given applied voltage the harmonic components
decrease with the increase of fog conductivity.
Keywords:
Ceramic insulator, clean fog, salt fog, humidity, leakage current, waveform,
harmonics
Issue
5, Volume 9, May 2010
Title of the Paper:
Optimal Design
for a Hydraulic Regeneration Propel System of the Hydraulic Hybrid Bus
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Authors:
Liu Guo-Qing, Chen Jie, Xu Fang-Fang
Abstract: Hydraulic regeneration propel system (HRPS) has been proven to be
able to enhance the fuel economy and reduce the emission by regenerating the
braking energy when it is installed in the existing conventional bus. The
rebuilt bus is normally termed as the Hydraulic Hybrid Bus (HHB). This paper
aims at exploiting full potential of the HRPS, so that the HHB is able to
acquire minimum fuel consumption and maximum dynamic performance with minimum
cost. The ideal point and weight square sum method is used to construct the
evaluate function so as to consider the tradeoff among the objectives. The
generation algorithm (GA) is used to solve the multi-objective optimization.
The results of the optimization show that the improving of the dynamic
performance combined with reduced cost and equivalent fuel-saving is possible.
The optimal designing approach presented by this paper provides the
theoretical directions for the design of HRPS for a HHB.
Keywords:
Regeneration, HRPS, HHB, Fuel economy, Multi-objective optimization, GA
Title of the Paper:
Intelligent
Guidance and Control Laws for an Autonomous Underwater Vehicle
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Authors:
Tain-Sou Tsay
Abstract: In this paper, intelligent guidance and control laws are developed
for an autonomous underwater vehicle to engage underwater targets. The
engagement of underwater targets is suffered from uncertainties of the
complicated underwater environment, short detecting range of the sonar seeker,
the low speed ratio between vehicle and target, and longtime operations but no
accurate positioning technique. Uncertainties of underwater environment
includes temperature-dependent sound propagation path, sound shadow zone,
current flowing direction, current flowing noise and self-noise of the
vehicle. The first object is to find the target. The second object is to track
the target and to re-track the target after the target lost. Seven guidance
laws are developed and switched by an intelligent selecting logic for target
engaging. Six control modes for yawing and pitching channel are developed.
Mode selections are dependent on the guidance laws selected. Those seven
guidance laws and six control laws are well tested by digital simulation
verifications of four scenarios. Simulation results give the proposed method
can cope with the complicated underwater environment to engage the target.
Keywords:
Guidance and control laws, autonomous underwater vehicle, underwater target
Title of the Paper:
A Contact
De-bounce Technique for an AC Permanent Magnet Contactor
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Authors:
Chih-Yu Hung, Chieh-Tsung Chi
Abstract: This paper presents a new low-cost electronic control circuit
actuator based on a microcontroller is proposed for minimizing the bouncing
duration of an AC permanent magnet (PM) contactor after two mechanical
contacts closing. The proposed new actuator overcomes the past bouncing
problem of an uncontrollable restrictions imposed by previously conventional
AC electromagnetic (EM) contactor. Systematically choosing an optimal closing
phase angle of the coil voltage, the bouncing problems produced on EM
contactor during the closing process are improved. Therefore, the using life
of contactor contacts is then prolonged and their operating reliability is
strengthened as well. To validate the feasibility of the proposed method, some
simulation and experimental procedures were performed on a prototype of the
proposed AC PM contactor in the laboratory. Testing results actually showed
that bouncing duration of contactor’s contacts after collision was reduced.
Keywords:
AC permanent magnet contactor, AC electromagnetic contactor, contact bounce,
closing phase angle, using life, microcontroller
Title of the Paper:
Recommendation
System for Apparel Online Shopping
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Authors:
Teruji Sekozawa
Abstract: Clients who visit an apparel marketing website but have little
previous knowledge of fashions tend to have difficulties selecting clothes
that suit their tastes. Faced with an immense number of products on display,
they can become quite confused and even hesitate to make any selections at
all. This study proposes a system that supports online purchases of garments
with functions to select and recommend garments on the basis of the customer’s
tastes. The system has three basic capabilities: (1) It analyzes the
customer’s tastes using the analytical hierarchy process (AHP) and selects and
suggests clothes. (2) It designates a priority for suggesting the garments
using correlations found by clustering. (3) It suggests second purchases of
items that have been chosen by previous customers with similar tastes who
bought a garment that the current online customer has just decided to buy. The
second purchases are selected using market basket analysis. Two databases are
essential to this process: one for the attributes of garments and one for
simultaneous purchases of garments.
Keywords:
Analytical hierarchy process, Online shopping, One-to-one, Recommendation
system, Coordination, Market basket analysis
Title of the Paper:
Load
Identification of Non-intrusive Load-monitoring System in Smart Home
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Authors:
Hsueh-Hsien Chang
Abstract: In response to the governmental policy of saving energy sources and
reducing CO2, and carry out the resident quality of local; this paper proposes
a new method for a non-intrusive load-monitoring (NILM) system in smart home
to implement the load identification of electric equipments and establish the
electric demand management. Non-intrusive load-monitoring techniques were
often based on power signatures in the past, these techniques are necessary to
be improved for the results of reliability and accuracy of recognition. By
using neural network (NN) in combination with genetic programming (GP) and
turn-on transient energy analysis, this study attempts to identify load
demands and improve recognition accuracy of non-intrusive load-monitoring
results. The turn-on transient energy signature can improve the efficiency of
load identification and computational time under multiple operations.
Keywords:
Load identification, artificial neural networks, non-intrusive load
monitoring, turn-on transient energy analysis, smart home
Title of the Paper:
Interline
Power Flow Controller Application for Low Frequency Oscillations Damping
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Authors:
Alivelu M. Parimi, Irraivan Elamvazuthi, Nordin Saad
Abstract: This paper presents the modeling of the power system installed with
the Interline Power Flow Controller (IPFC), the latest proposed Flexible AC
Transmission System (FACTS) controller. The IPFC is modeled in d-q axis form,
and the dynamic model of a single machine infinite bus (SMIB) power system
installed with IPFC is developed. Further, the linearized Phillips-Heffron
model of the power system is established to study the oscillation stability.
The damping controllers considering the various control signals are designed
based on the linearized model. The power oscillation stability is investigated
with the use of eigenvalue analysis and by nonlinear simulation of the dynamic
model of the power system. Studies reveal that the most effective input signal
of IPFC utilized for damping the low frequency oscillations is found to be the
input signal , providing robust performance under different operating
conditions.
Keywords:
FACTS, Interline power flow controller, Modelling, Phillips Heffron model,
Power oscillation stability
Title of the Paper:
Research on
Maintenance and Safety-Ensuring Information Platform in Refining and Chemical
Enterprises Based on SOA
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Authors:
Liu Wenbin, Gao Jinji, Yang Jianfeng, Wang Qingfeng, Zhong Xin
Abstract: Dynamic monitoring and risk-based management of close-loop are both
proposed in this paper for equipments in refining and chemical enterprises.
Research on the optimal inspection and maintenance mode on the basis of
Dynamic Risk-Based Inspection (DRBI) and Dynamic Reliability-Centered
Maintenance (DRCM) is carried out. Maintenance and Safety-ensuring Information
Platform (MSI) is developed based on SOA, through which the Dynamic Data
Platform of the Running Status is established and businesses of heterogeneous
system are integrated, thus eradicating Information Island formed among
condition monitoring system, fault diagnosis system, risk analysis system and
engineering asset management (EAM) system. Meanwhile, combined with ERP, MSI
can provide long-term technological support for the stable and economical
operations of equipments, and it has been gaining increasing popularity in
process industry.
Keywords:
Safety-Ensuring, Systematic Diagnosis, Information System, Risk-Based
Inspection, Reliability-Centered Maintenance, Service-Oriented Architecture
Title of the Paper:
Dynamic
Voltage Regulator based on PWM AC Chopper Converter: Topology and Control
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Authors:
Jin Nan, Tang Hou-Jun, Lan Jian-Yu, Yao Chen, Chen Wei-Wei, An Xiao-Yu
Abstract: This article presents a novel topology of dynamic voltage regulator
using transformer and PWM AC chopper. The proposed voltage regulator employs
an ac chopper converter to generate compensation voltage and uses the
transformer to isolate the power converter from the load. When input voltage
sags and swells occur, the output voltage can be regulated by changing the
duty ratio of the PWM control signals. The transformer is connected in series
with the load. Thus, the load voltage can be kept stable when input voltage
fluctuations occur. For this purpose, a feedforward feedback digital
controller has been designed to perform the lose-loop control. The proposed
converter and control strategy present the advantages of fast dynamic response
and effective compensation to the voltage fluctuations. Simulations are made
to investigate the performances of the proposed converter. The simulation
results show that the designed voltage regulator has fast transient response,
and can suppress the load voltage fluctuations effectively. The prototype is
also setup. The simulation results have been validated by the experiment.
Keywords:
AC chopper, Voltage Regulator, Pulse Width Modulation, Feedforward and
Feedback Control, Voltage Sags, Voltage Swells
Title of the Paper:
Prototype of a
Mirror Bender for Siam Photon Laboratory
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Authors:
A. Oonsivilai, A. Suthummapiwat, P. Songsiritthigul, B. Marungsri, T.
Kulworawanichpong
Abstract: This paper presents a design study of adjustable mirror bender
system. This system is functioned to adjust beam size focusing on sample in
synchrotron light beamline (BL3) at synchrotron light research institute,
Thailand. The design utilizes COSMOS program to help in finite element method
for simulating the relation of radius value of mirror in function of various
action force applying on curvature mirror. Al Alloy(6061) and Zerodur size
40mm x 300mm x 15mm are used as study mirror. All of structures of mirror
bender system are built by stainless steel. The simulation of system is to
apply a forces to adjust the mirror radius in 50,000 – 60,000 mm range for
using it in real circumstance in beamline system. The results of study show
the forces in 100-150 N range for Al Alloy (6061) and 150-200 N range for
Zerodur giving proper curvature radius values. In contrast, the apply force is
more than 300 N calculating from 80% of stress value of mirror, that damages
the system. Finally, a prototype of the system is designed and built by using
Al Alloy(6061) as a bender mirror. The testing results of the prototype show
that apply forces just in range of 50-100 N are suitable enough for the
system. That means the apply force of the prototype is 50 N less than the
simulation. Therefore, this mirror bender system is ready and suitable for
installation in synchrotron light beamline.
Keywords:
Synchrotron light beamline, mirror bender, Zerodur, COSMOS
Title of the Paper:
The Study of
Recursive-Based Sliding Mode Adaptive Control of the Permanent Magnet
Synchronous Motor
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Authors:
Zhang Yaou, Zhao Wansheng, Wei Hongyu
Abstract: The urgent needs in many occasions have stimulated the study of the
permanent magnet synchronous motor (PMSM). The model of the PMSM system has
multi-variable, highly nonlinear, strong coupling character and the control
performance of the PMSM drive system is also influenced by the uncertainties
of the plant composed of unpredictable plant parameter variations, external
load disturbances, and unmodelled nonlinear dynamics. In order to design a
controller to meet with the desired requirement, based on Lyapunov stability
theorem, the combined multiple recursive based sliding mode adaptive
controller has been proposed and the physical parameters learn algorithm has
been derived. This combined controller integrates the virtues of these three
kinds of controllers, and it provides a solution to the servo position control
of permanent magnet synchronous motor with the parameters of uncertainty and
external load disturbance and also a reference criterion for the controller
parameters selection. Theory derivation and experiment simulation results
verify the effectiveness and feasibility of the controller. This method
provides the foundation of the settlement of the servo position control of the
permanent magnet synchronous motor.
Keywords:
Permanent Magnet Synchronous Motor (PMSM); sliding mode control;
recursive-based control; adaptive control; Lyapunov stability theorem;
nonlinear dynamics
Title of the Paper:
Implementation
and Study of Grid-Connected Control for Distributed Generation System
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Authors:
Jianfei Zhao, Xingwu Yang, Jianguo Jiang
Abstract: An intelligent grid-connected control system for distributed
generation system is proposed and studied. The proposed control system
consists of reactive power compensation control strategy, dead-time
compensation control strategy, voltage and current control strategy,
anti-islanding control strategy, and so on. The interrelationships of the
control strategies are also developed so as to form an intelligent and
integrated protection system for the distributed generation system. A 10 kW
power conditioner which consists of a dc-dc boost converter and a three-phase
dc-ac voltage source inverter is established. Experimental results show that
the power conditioner with the proposed control system can operate with high
efficiency, high power factor and low current and voltage total harmonic
distortion in a wide output range. Thus, it can be considered as a total
solution of the control strategy for distributed generation system.
Keywords:
Grid-Connected Control, Distributed Generation System, Anti-Islanding
Detection, Total Harmonic Distortion, DC-DC Boost Converter, DC-AC Voltage
Source Inverter
Issue
6, Volume 9, June 2010
Title of the Paper:
On Improvement
in the Adaptive Sliding-Mode Speed Observer
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Authors:
Wirote Sangtungtong
Abstract: This paper describes the further development concerning an adaptive
sliding-mode speed observer employed as the rotor speed and resistance
estimators for a three-phase squirrel-cage induction motor (IM). The novel
observer is improved from the previous work by a way of on-line calculating
the errors of rotor flux estimations and then feeding them to the PI adaptive
laws. For that reason, these errors vanish in steady state. Moreover,
stability of the proposed observer is guaranteed and verified via the Lyapunov
function and its derivative. Finally, the performance between the novel and
the previous observers is compared fairly.
Keywords:
Adaptive sliding-mode observer, Error of rotor flux estimation, Induction
motor, Lyapunov stability, PI adaptive law, Speed observer, State observer
Title of the Paper:
Emotion-Oriented
eCommerce Systems
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Authors:
Simone Leon, Alexander Nikov
Abstract: During recent years, the use of intelligent systems in eCommerce has
increased significantly, providing a new perspective on the overall online
shopping experience. The rapid growth of eCommerce has motivated many studies
on the relationship between website design, company reputation, and purchase
intent. Understanding emotion is important in gaining insight on how to
efficiently satisfy the needs of the eCommerce customer. Emotion recognition
techniques based on modern mathematical models using computational
intelligence are presented. Progression within this field of study is
highlighted. The requirements for designing of intelligent emotion-oriented
eCommerce systems are defined. A model for simulation of intelligent
emotion-oriented eCommerce systems is proposed. It is an important tool
supporting the experimental study and design of emotion-oriented eCommerce
systems.
Keywords:
eCommerce, Emotion Recognition, Computational Intelligence, Modelling, Affect
Title of the Paper:
Multiple Zones
Surveillance System Using RFID
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Authors:
M. H. Noor Hazrin Hany, D. Hanita, Y. Noorhana, I. Mohd Amirul
Abstract: Monitoring and tracking the activities of individuals (or objects)
in multiple zones or areas simultaneously is quite a challenging task. It is a
very common practice to use observation cameras or to have security personnel
to guard the specified areas. However, area surveillances using these common
methods may become tedious when the activities to watch out for increases.
More cameras as well as manpower are needed to cater for the increment of
activities for each zone. On top of that, should anyone (or objects) vacates
or trespasses the designated areas, it would take some time to identify them,
hence resulting complexity in tracing their whereabouts. To overcome these
challenges, we propose a surveillance system for multiple zones using RFID
technology. Individuals or objects to be monitored are tagged using RFID tags
that hold unique identification. Each zone is allocated with one RFID reader,
which will transmit the information of activities of the respective zones to
the host computer in the control room. The security personnel in the control
room would be able to identify which individual or objects that are out of
their designated zones or trespassing to another zone based on the tags that
has been detected by the reader. Should the tags are removed without
authorization, alarm will be generated. Every activity transactions are
recorded in a database for future references or actions. A case study of
inmate tracking system is conducted and demonstrated to prove the capability
of the proposed method.
Keywords:
Radio Frequency Identification (RFID), multiple zones surveillance, RFID
reader, RFID tags
Title of the Paper:
Differential
Evolution Application in Temperature Profile of Fermenting Process
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Authors:
Ratchadaporn Oonsivilai, Anant Oonsivilai
Abstract: It is regularly to optimization of temperature and feeding profiles
in batch process for several objectives and constraints. A temperature profile
is applied to drive the process so as to obey certain constraints during the
beer fermentation. The design of this temperature profile is an optimization
problem where the objective is to minimize the operation time and optimize the
quality of beer. In this paper, differential evolutionary computation is
exploited to efficiency handle such problems. The proposed approach has been
implemented and practical to design temperature profile for beer fermentation
process. The results show that differential evolution is a proficient and at
ease method to incorporate the prior knowledge of the user into the
temperature profile optimization of batch processes.
Keywords:
Optimization, Fermentation, Brewery, Differential Evolution, Temperature
profile
Title of the Paper:
Response
Surface Method Application in Gasifier System Identification for Biomass Power
Plants
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Authors:
A. Oonsivilai, J. Satonsaowapak, T. Ratniyomchai, T. Kulworawanichpong, P.
Pao-La-Or, B. Marungsri
Abstract: The use of renewable energy sources becomes more necessary and
interestingly, wider application of renewable energy devices at domestic,
commercial and industrial levels is not only resulted in greater awareness but
also significantly installed capacities. In addition, biomass principally is
in the form of woods and more than that used in form of energy by humans for a
long time. Gasification is a process of conversion of solid carbonaceous fuel
into combustible gas by partial combustion. Many gasifier models have various
operating conditions thus the parameters were kept in each model are
different. This study applied the experimental data which have three inputs
that are biomass consumption, air flow rate and ash discharge rate and one
output is gas flow rate. For this paper, response surface methods was used to
identify the gasifier system equation that suitable for this experimental data
in this paper and the method were used to identify gasifier system model were
multiple linear regression, quadratic model and cubic model. In the result,
cubic model was better way from three methods to get the answer.
Keywords:
Gasifier System, Identification, Response Surface Method
Title of the Paper:
Implementation
Roadmap using Voronoi Diagrams for Vision-based Robot Motion
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Authors:
Shahed Shojaeipour, Sallehuddin Mohamed Haris, Ali Shojaeipour
Abstract: In this paper, we present a method to navigate a mobile robot using
a webcam. This method determines the shortest path for the robot to transverse
to its target location, while avoiding obstacles along the way. The
environment is first captured as an image using a webcam. Image processing
methods are then performed to identify the existence of obstacles within the
environment. Using the Voronoi Diagrams VD(s) method, locations with obstacles
are identified and the corresponding Voronoi cells are eliminated. From the
remaining Voronoi cells, the shortest path to the goal is identified. The
program is written in MATLAB with the Image Processing toolbox. The proposed
method does not make use of any other type of sensor other than the webcam.
Keywords:
Mobile robot, Path planning, Voronoi Diagrams, Image processing, Visual servo
Title of the Paper:
Robust Audio
Watermarking Using Multiwavelet Transform and Genetic Algorithm
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Authors:
Prayoth Kumsawat, Kitti Attakitmongcol, Arthit Srikaew
Abstract: In this paper, we propose a new approach for optimization in digital
audio watermarking using artificial intelligent technique. The watermarks are
embedded into the low frequency coefficients in discrete multiwavelet
transform domain. The embedding technique is based on quantization process
which does not require the original audio signal in the watermark extraction.
We have developed an optimization technique using the genetic algorithm to
search for optimal quantization step in order to improve both quality of
watermarked audio and robustness of the watermark. In addition, we analyze the
performance of the proposed algorithm in terms of signal-to-noise ratio,
normalized correlation and bit error rate. The experimental results show that
our proposed method can improve the quality of the watermarked audio signal
and give more robustness of the watermark as compared to previous works.
Keywords:
Audio watermarking, Multiwavelet, Genetic algorithm, Artificial intelligence,
Optimization
Title of the Paper:
User Friendly
System for the Visually Impaired in Learning Al-Quran
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Authors:
F. Razaly, N. H. Ajizan, S. Mad Saad, M. S. Yaacob, M. Z. Md Zain, M. Hussein,
M. Y. Abdullah, A. R. Musa
Abstract: This study presents a method to enable the visually impaired Muslim
to learn and read the Al-Quran using Braille Display with software help. The
system reads the database which contains all verses of Al-Quran and user will
need to select the verse and ayah to read. Besides that, this system can be
used in a class to teach visually impaired students to learn Al-Quran. Every
word or character typed by the instructor in the main Braille Panel will be
transmitted to the sub Braille Panel that is connected to the main Braille
Panel. The selected verse of Al-Quran and ayah will also generate an index
before being transmitted to the Braille Panel. The index will be transmitted
to the Braille Display for people to touch and read the display. A user
friendly Graphical User Interface (GUI) will be used to fulfill the ergonomics
for the visually impaired user’s physical capabilities. Several approaches are
used to design and implement the interface for the visually impaired like
speech or sound output and Braille display. The Braille codes can be displayed
using the Braille panel. The design interface and structure of the system for
the visually impaired users in learning Al-Quran is presented.
Keywords:
Graphical User Interface (GUI), Screen Reader, Visually Impaired People
Title of the Paper:
Information
Security Investment Decision-making based on Fuzzy Economics
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Authors:
J. N. Sheen
Abstract: Fuzzy economic models to evaluate the economic feasibility of
information security investment for decision-makers is derived in this study.
The Net Present Value and discounted Return on Investment models are proposed
for the execution of cost-benefit analysis. Fuzzy mathematics is based on the
extended principles which ensured that the resultant fuzzy number continuously
maintained its fuzzy properties during the arithmetic operating procedure.
Since fuzzy results are in the form of a complex nonlinear representation, and
do not always provide a totally ordered set in the same way that crisp numbers
do, the current paper approximates the resulting fuzzy profitability indexes
by a triangular fuzzy number initially, and then uses the Mellin Transform to
obtain the means and variances of the triangle fuzzy numbers in order to
determine their relative ranking in a decision-making process. The
performances of the proposed models are verified by considering their
application to a practical illustration, which were used in a previous
literature. These investigations not only confirm that the results of the
fuzzy economic models are consistent with those of the conventional crisp
models, but also demonstrate that the proposed models represent readily
implemented possibility analysis tools for use in the arena of uncertain
financial decision-making. The developed models represent readily implemented
feasibility analysis tools for use in the arena of uncertain economic
decision-making.
Keywords:
Fuzzy economics, fuzzy mathematics, information security investment,
benefit-cost analysis, decision-making, possibility analysis, Mellin transform
Title of the Paper:
Generalized
Optimization Methodology for System Design
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Authors:
Alexander Zemliak, Ricardo Pena, Eduardo Rios
Abstract: The new general methodology for the analog system optimization was
elaborated by means of the optimum control theory formulation in order to
improve the characteristics of the system design process. A special control
vector is defined to redistribute the compute expensive between a network
analysis and a parametric optimization. This approach generalizes the design
process and generates a set of the different optimization strategies that
serves as the structural basis to the optimal design strategy construction.
The principal difference between this new methodology and before elaborated
theory is the more general approach on the definition of the system parameters
and more broadened structural basis. The main equations for the system
optimization process were elaborated. These equations include the special
control functions that generalize the total system optimization process.
Numerical results that include as passive and active nonlinear networks
demonstrate the efficiency and perspective of the proposed approach.
Keywords:
Time-optimal design algorithm, control theory formulation, general methodology
Title of the Paper:
Control of
Periodically Time-Varying Systems with Delay: An Algebraic Approach vs.
Modified Smith Predictors
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Authors:
Radek Matusu, Roman Prokop
Abstract: The paper deals with comparison of different continuous-time
strategies applied to control of singleinput single-output (SISO) periodically
time-varying systems with delay. The first method is based on the fractional
representation in the ring of proper and stable rational functions (RPS),
general solutions of Diophantine equations and conditions of divisibility
while the other two methods use the modified Smith predictor structures in
combination with standard forms for minimum of integral squared time error
(ISTE) or design by Coefficient Diagram Method (CDM). The capabilities of all
techniques are demonstrated on simulative examples for first and second order
periodically time-varying time-delay systems. Moreover, various modifications
and improvements, such as control structure with more degrees of freedom or
utilization of disturbance controller are also included in the research.
Keywords:
Time-Varying Systems, Time-Delay, Algebraic Synthesis, Modified Smith
Predictor, PI-PD Control, Coefficient Diagram Method
Issue
7, Volume 9, July 2010
Title of the Paper:
Analysis of
the Modernized System for Monitoring Environmental Parameters in Workings with
Hazard of Explosive Atmospheres
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Authors:
Burian Sorin, Aurel Selejan, Emilian Ghicioi, Jeana Ionescu, Marius Darie,
Lucian Moldovan, Tiberiu Csaszar
Abstract: Actual firedamp monitoring systems, placed in firedamp mines from
Romania, interrogate the detection heads (transducers) at a 4 minutes period,
in order to monitor methane concentration. In site, in this time, methane
accumulations can occur and could result even explosions. This paper presents
a new system that monitors the methane concentration by interrogating the
transducers at a period of 4 seconds. Concurrently, with the help of this
system, even other environmental parameters are monitored, and the number of
detection heads can be increased from 40 to 64 or more, as necessary.
Keywords:
Acquisition system, measurement and control, central computing unit,
computerized recorder, intrinsic safety, explosive atmosphere
Title of the Paper:
Modern
Prediction Methods in the Monitoring Process of Security Parameters
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Authors:
Marius Darie, Sorin Burian, Jeana Ionescu, Tiberiu Csaszar, Lucian Moldovan,
Adriana Andris
Abstract: The lack in exploiting the data resulted from the security
parameters monitoring process represents a state of fact equivalent with
economical losses. In this paper, the authors recommend that some indirect
parameters obtained by calculus to be taken into account. These parameters
give us additional important clues regarding the forecast of monitored
parameters. Thus, two theoretical models have been proposed and the algorithms
were conceived. The implemented calculation program has been tested using an
artificial set of values for the monitored parameter.
Keywords:
Monitored parameters, prediction, theoretical model, parameters dynamic,
system status, regression filter, polynomial regression
Title of the Paper:
Non-Linear
Filtering in the Estimation of a Term Structure Model of Interest Rates
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Authors:
Shu Wu
Abstract: The methods of the class of Kalman filters have recently been used
in the estimation of the term structure of interest rates. These methods can
employ both time-series and cross-sectional aspects of term structure models.
This paper compares the performance of two kinds of non-linear Kalman filter
algorithms - Extended Kalman Filter (EKF) and Square-Root Unscented Kalman
Filter (SRUKF) in estimating one popular exponential-affine term structure
model. Simulation results show that SRUKF is of higher approximation accuracy
and stronger numerical stability than EKF is.
Keywords:
Non-linear filtering, Square-Root Unscented Kalman Filter, Extended Kalman
Filter, Term structure of interest rates, Exponential-affine term structure
model, One-factor Vasicek model
Title of the Paper:
Approximation
of Force and Energy in Vehicle Crash Using LPV Type Description
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Authors:
Istvan A. Harmati, Andras Rovid, Peter Varlaki
Abstract: In accident analysis, vehicle crash mechanics and vehicle safety
research modeling of the deformational force and absorbed energy plays a
crucial role. The usually applied FEM based methods give good approximations,
but they have extremely large computational complexity and require a detailed
knowledge about the parameteres of the crash and the vehicle. There are
simpler models, but they not give satisfactory approximation. In this paper
using the LPV-HOSVD paradigm we introduce a model for vehicle deformation
process, which well approximates the deformation force and the absorbed
energy, moreover it has acceptable computational complexity.
Keywords:
Vehicle crash, force model, LPV model, tensor product transformation, higher
order singular value decomposition (HOSVD)
Title of the Paper:
Some Optimal
Approximate Methods with Application to Thin Film Flow
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Authors:
Vasile Marinca, Nicolae Herisanu, Dumitru Bala
Abstract: In this work a totally analytic solution for this film flow of a
fourth grade fluid down a vertical cylinder are obtained using some
approximate optimal methods. These approaches do not depend upon any small or
large parameters in comparison with other perturbation methods. The solutions
obtained using our procedures are in good agreement with the exact solution,
which show the applicability of the methods.
Keywords:
Optimal variational iteration method (OVIM), Optimal parametric iteration
method (OPIM), thin film flow, approximate analytic solution
Title of the Paper:
Comparative
Study Regarding the Optimization and Analysis of Automatic Systems using PID,
LQR and PI-MIMO
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Authors:
Paul Ciprian Patic, Luminita Duta
Abstract: Automatic modeling system using Matlab-Simulink software package
applies the Cohen-Coon method for determining the closed loop PID parameters
and plotting the system response clue. Implementing the same system in closed
loop PID adjustment using LabVIEW software package, requires, at first, an
additional procedure, namely, the use of transfer functions in Z domain, that
means the use of sampling signal. The study from this paper intends to
determine the parameters of a PID regulator using two software packages -
MATLAB-Simulink and LabVIEW. As a mathematical pattern a DC machine has been
used. To exemplify regulators PID, LQR (Linear Quadratic Regulator) and
PI-MIMO (PI – Multiple Input Multiple Output) were used. The application is
easy to be implemented, the inverted pendulum being used to emphasize the
results. The closed loop system and its evolution over time are easily
implemented. This software package offers an easy user interface, which means
that is convenient to introduce the program functions.
Keywords:
Inverted pendulum, PID regulator, LQR regulator, PI-MIMO regulator
Title of the Paper:
Dynamic
Compensation of Hard-Disk R/W Head and Head-Stack
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Authors:
Nuapett Sarasiri, Arthit Srikaew, Sarawut Sujitjorn
Abstract: R/W heads of HDDs are inherently unstable or highly underdamped.
Compensations are always necessary for the heads and actuators to function
properly under motion control. This article provides the control models of the
single-head and the head-stack. Comparison studies of various compensation
structures are presented. Resonance issue has been addressed with the
corresponding mitigation technique. The design optimization to improve the R/W
head performance and stability has been achieved via adaptive tabu search.
Keywords:
Hard disk R/W head, head-stack, dynamic compensation, resonance, adaptive tabu
search
Title of the Paper:
Dynamical
Model of a Power Plant Superheater
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Authors:
Pavel Nevriva, Stepan Ozana, Martin Pies, Ladislav Vilimec
Abstract: The paper deals with simulation of both dynamics and control of
power plant superheaters. Superheaters are heat exchangers that transfer
energy from flue gas to superheated steam. A composition of superheater, its
input and output pipelines, and fittings is called a superheater assembly.
Inertias of superheater assembly are often decisive for design of a steam
temperature control system. Mathematical model of a superheater assemble is
described by sets of nonlinear partial differential equations. The accuracy of
the mathematical model is the center of the problem of simulation. Dominant
role plays the accuracy of the mathematical model of the superheater. To
discuss the accuracy of the mathematical model, the model was applied to the
output superheater assemble of the 200 MW generating block of the actual
operating power plant. To analyze the accuracy of the mathematical model, the
system was agitated by test signals. Experiments carried out at the power
plant were simulated mathematically. Then, data obtained by the measurement
were compared with simulation results. Comparison leads to the verification of
both the accuracy and the serviceability of the mathematical model discussed.
Keywords:
Simulation, Measurement, Superheaters, Partial differential equations, Model
verification
Title of the Paper:
Bifurcation
and Chaos Phenomena Appearing in Induction Motor under Variation of PI
Controller Parameters
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Authors:
N. Jabli, H. Khammari, M. F. Mimouni, R. Dhifaoui
Abstract: Bifurcation theory deals with the change of qualitative behavior in
a parameter space of dynamical systems. This paper provides a numerical
approach to better understand the dynamic behavior of an indirect field
oriented control (IFOC) of a current-fed induction motor. The focus is on
bifurcation analysis of the IFOC motor model parameters, with a particular
emphasis on the change that affects the dynamics and stability under small
variations of Proportional Integral controller (PI) parameters. In fact, the
dynamical properties of this electrical machine exhibit a rich behavior.
Indeed equilibrium point and complex oscillatory phenomena such as limit cycle
and chaos are observed. Since a perturbation of PI control gains led to the
existence of regular behavior and region where chaotic phenomena may occur.
Properties of both parametric and phase plane singularities are carried out by
using numerical simulations. Furthermore, bifurcation diagrams for the
equilibrium points and the 2-parametric bifurcation curves are computed based
on continuation methods for solving differential equations. This paper also
attempts to discuss various types of the transition to chaos in the induction
motor model. The analysis of the obtained bifurcation simulations gives useful
guidelines for adjusting both motor model and PI controller parameters.
Keywords:
Induction motor, PI Controller gains, Qualitative behavior, Bifurcation, Chaos
Title of the Paper:
Design of an
Adaptive Faults Tolerant Control: Case of Sensor Faults
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Authors:
Atef Khedher, Kamel Ben Othman, Didier Maquin, Mohamed Benrejeb
Abstract: This paper presents a method of design of a sensor faults tolerant
control. The method is presented for the case of linear systems and then for
the case of non linear systems described by Takagi- Sugeno models. The faults
are initially estimated using a proportional integral observer. A mathematical
transformation is used to conceive an augmented system in which the sensor
fault appear as an unknown inputs. The synthesized control depends on the
estimated faults and the error between the state of a reference reference and
the faulty system state. The fault tolearnt control is conceived using the
augmented state. The conditions of the observer convergence and of the control
existence are formulated in terms of Linear Matrix Inequalities (LMI). The
formulation in LMI shows that the synthesis of the control and the observer
can be independently made. For both cases (linear and non linear) The
theoretical results are validated by their application to a noisy system
affected by sensor faults.
Keywords:
Multiple model, estimation, proportional integral observer, sensor faults,
faults tolerant control
Title of the Paper:
Observer
Design for Nonlinear Systems Represented by Takagi-Sugeno Models
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Authors:
Wafa Jamel, Nasreddine Bouguila, Atef Khedher, Kamel Ben Othman
Abstract: In this paper, the problem of synthesis of a multiple observer for a
class of uncertain nonlinear system represented by a Takagi-Sugeno multiple
model is studied. The measure’s uncertainties are considered as unknown
outputs. To conceive the observer a mathematical transformation is considered
to conceive an augmented system in which the unknown output appear as an
unknown input. Convergence conditions are established in order to guarantee
the convergence of the state estimation error. These conditions are expressed
in Linear Matrix Inequality (LMI) formulation. An example of simulation is
given to illustrate the proposed method.
Keywords:
Takagi-Sugeno models, multiple observer, state estimation, unknown inputs,
unknown outputs, measures uncertainties
Issue
8, Volume 9, August 2010
Title of the Paper:
A High Speed
Reconfigurable USART IP Core with Support for Multi-Drop Networks
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Authors:
Ali H. El-Mousa, Nasser Anssari, Ashraf Al-Suyyagh, Hamzah Al-Zubi
Abstract: Field Programmable Gate Arrays (FPGA) are increasingly becoming the
mainstay of embedded systems due to their flexibility, speed, ease of use and
reusability. At the same time, networking and data communications between the
different parts of an embedded system and between different embedded systems,
is becoming a necessity due to large complex projects. This paper presents the
design, implementation, and testing results of a flexible and user
reconfigurable Universal Synchronous Asynchronous Receive Transmit (USART) IP
core suitable for use in embedded systems and Systems on Chip (SoC). The
design scheme employed, allows the USART to be used in various modes of
operation such as standalone and 9-bit addressable mode for multi-drop network
of serial devices. It also supports high speed data rates of up to 3 Mb/s. The
design utilizes Hardware Description Language (HDL) to describe the operation,
ease implementation and allow cross platform utilization. The paper shows
through a comprehensive testing methodology that the proposed design functions
properly while consuming minimum resources from the target FPGA.
Keywords:
Embedded systems, addressable USART, IP core, FPGA, multi-drop networks, HDL
Title of the Paper:
Performance
Analysis of Limited Bandwidth Active Suspension with Preview Based on a
Discrete Time Model
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Authors:
Zhang Xin, Zhang Jianwu
Abstract: A car suspension system is the mechanism that physically separates
the car body from the wheels of the car. Active suspensions differ from the
conventional passive suspensions in their ability to inject energy into the
system, which can improve the trade-off between the ride comfort and road
handling. A discrete optimal control algorithm is proposed in this paper for a
limited bandwidth active suspension, in which both look-ahead and wheelbase
preview information are utilized. The preview optimal algorithm is implemented
in Matlab/Simulink software environment based on a half-vehicle model. The
effect of preview time on system performance is investigated. In order to
reduce the energy consumption, the effect of various bandwidth of actuator is
particularly examined. Simulation results show that the preview time can
influence overall system performance remarkably, and 0.2 s look-ahead preview
time is preferable. Theoretical deviation of the optimal control gain is given
to explain the fact that only look-ahead preview benefits the front wheel’s
motion while wheelbase preview benefits the rear wheel’s motion much more. The
pitch motion performance deterioration compared with passive case brought by
preview can be eliminated to some extent. With preview information, suspension
working space requirement can be restrained to a prominent low degree. 6 Hz
system is the most suitable one to achieve the trade-off between performance
potential and energy consumption in the range 3~15 Hz for limited bandwidth
active suspension.
Keywords:
Active Suspension, Preview, Control Algorithm, Half-vehicle Model, Limited
Bandwidth
Title of the Paper:
Automated
Trisomy 21 Assessment Based on Maternal Serum Markers Using Trivariate
Lognormal Distribution
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Authors:
Lai Khin Wee, Lim Miin, Eko Supriyanto
Abstract: Trisomy 21 is the most frequent types of chromosomal abnormalities.
Generally, current methods for trisomy risk assessment are divided into two
techniques, which are invasive and non-invasive methods. Invasive methods are
including amniocentesis, chorionic villus sampling (CVS), or percutaneous
umbilical cord blood sampling (PUBS), but its drawbacks are expensive, time
consuming and having risk of miscarriage, where else non-invasive methods are
counting on ultrasound marker and maternal serum markers screening.
Nevertheless, single evaluations on ultrasound markers itself are always not
enough for risk assessment in terms of its accuracy, reliability and
consistency. So, we proposed a new mathematical algorithm which combines three
maternal serum markers using trivariate lognormal distribution to calculate
automatically the probability or likelihood that a woman has an affected
pregnancy or not. The developed algorithm was implemented into graphical user
interface to act as computer aided e-diagnostic system. We have compared the
results with published finding and found it is almost equally accurate.
Keywords:
Trisomy 21, maternal serum marker, maternal health data, trivariate
distribution, bivariate distribution, chromosomal abnormalities, multivariate
distribution
Title of the Paper:
Study of the
Deforming Regime Introduced in the Power Supply Grid by the Electric
Locomotives Equipped with DC Motors
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Authors:
Corina Daniela Cuntan, Ioan Baciu, Gabriel Nicolae Popa, Anca Iordan
Abstract: In this work is presenting the study of the electric current’s
parameters and characteristics, obtained by means of an electric power’s
quality analyzer. Also, are analyzed the various possibilities of compensating
the effects produced by the consumers, e.g. by the locomotives equipped with
DC motors, in order to reduce the reactive power, the current harmonics or the
voltage harmonics, respectively the reactive power and harmonics
simmultaneously. The measurements were made into an AC railway electric
traction substation of 27 kV, during more hours, being registered momentary
and average values. The data acquired with the electric power’s quality
analyzer were registered into a computing system, for their further analysis.
In order to achieve the adaption between the analyzer’s input measures and the
traction line’s values, the measurements were made in the secondary of the
voltage and current transformers existent in the traction substation.
Keywords:
Electric power’s quality, active power, reactive power, apparent power,
harmonic distorsion factor, power factor, electric power’s quality analyzer
Title of the Paper:
Analysis of
Traffic Noise in a Road Intersection Configuration
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Authors:
Claudio Guarnaccia
Abstract: Acoustical noise produced by vehicular traffic depends on many
parameters, including the geometry and the general features of the road. The
presence of a conflicting point, i.e. an intersection, strongly affects and
modifies the simulation strategy of noise in urban environments, that is
usually performed with statistical models tuned on experimental data related
to standard condition (free flow traffic, intermediate vehicular volumes,
etc.). In this paper, the author presents the analysis of an intersection case
study in proximity of Salerno University, performed by means of experimental
measurements and software simulations. The chosen area presents interesting
features because of the priority rights on the principal road and because of
the relevant amount of vehicles and buses, mainly due to the University
students and personnel that transit in the intersection, especially during
rush hours. The aid of a predictive software is highlighted, together with the
shortcomings of a simulation strategy that does not take into account traffic
dynamics. The analogy between electrical current and vehicular flow is
sketched and used in the roads vehicles volume definition.
Keywords:
Acoustical Noise Control, Traffic Noise, Road Intersections, Modelling
Title of the Paper:
A Fuzzy
Systems Framework for Solving Real World Problems
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Authors:
Michael Gr. Voskoglou
Abstract: Mathematical modelling and Case-Based Reasoning (CBR) are the two
principal methods used for the solution of real world problems. In the present
paper we attempt a mathematical description of the above processes by using
principles of fuzzy logic and of uncertainty theory. Examples are also
presented to illustrate our results.
Keywords:
Fuzzy sets, fuzzy relations, fuzzy models, uncertainty, possibility theory,
mathematical modelling, Case-Based Reasoning
Title of the Paper:
A Fuzzy
Prediction Based Trajectory Estimation
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Authors:
Hakan Tozan, Mustafa Yagimli
Abstract: Image processing, object tracking and trajectory estimation are the
integral topics of computer vision which are rapidly gaining importance due to
their non-ignorable relation with defense, security and also health sectors.
In this paper; by use of image processing techniques, real time images
containing tracked object from the camera are transferred to a Visual Basic
based software; tracked object in images is discerned from the background and
using segmentation process transferred into matrix form via which object
centre point coordinates are determined. After determination of centre point
coordinates, the trajectory the moving object is estimated with an adaptive
fuzzy time series forecasting model using the determined coordinate values.
Keywords:
Object tracking, Trajectory estimation, Adaptive estimation, Fuzzy time series
Title of the Paper:
Predicting the
Mechanical Behavior of Steel Frames Exposed to Elevated Temperatures using
Artificial Neural Networks
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Authors:
Moudar H. Zgoul
Abstract: The structural behavior fire-resistant steel is essential;
fire-resistant steel is proven to have higher strength at elevated temperature
than that of conventional steel. Also, the requirement of fire protection in
the fire-resisting steel can be relaxed as compared with conventional steel
structures. However, the design criteria for the application of the
fire-resisting steel in steel columns are still limited. Experimental approach
into the analysis of fire-resistant steel frames is costly and expensive. Such
analyses aim at evaluating the variations of the ultimate strength of steel
frames due to the reduction effects on strength resulting in the increasing
temperature. An alternative approach to model the mechanical behaviour of
steel frames when exposed to fire at high temperatures is presented in this
work. The concept is based on a series of stress-strain curves obtained
experimentally at various temperature levels. An artificial neural network
(ANN) is employed to predict the stress-strain curve under such condition. The
numerical results obtained from ANNs of stress levels for the material were
compared with the experimental data. A New model for reduction factor is
introduced and compared with other models. Using ANN was found to be an
efficient tool for modelling the material properties of steel frames for high
temperature applications.
Keywords:
Material models, artificial neural networks, fire-resistant steel, fire load,
stress strain curves, strength of materials, elevated temperature
Title of the Paper:
Automatic
Valuation of Jordanian Estates Using A Genetically-Optimised Artificial Neural
Network Approach
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Authors:
Mousa Al-Akhras, Maha Saadeh
Abstract: Estate appraisal can be defined as valuing a land or property as of
a given date using common data utilising standardised methods and statistical
testing. Estate appraisal has several applications such as asset valuation for
lenders, property tax estimation, insurance estimation, and estate planning,
grant new mortgages to new home buyers, and purchase mortgage packages, which
can contain thousands of mortgages, as investments. It is also used to guide
potential buyers and sellers with making purchasing decisions. The drawbacks
of on-site manual property valuation include: it is time-consuming, costy,
based on subjective judgments and sometimes it is based on validation using a
negotiated price rather than estimating the true market value of a property.
In this paper, the authors build an Artificial Neural Network model for the
purpose of automatic appraisal of Jordanian estates to avoid the drawbacks of
manual appraisal. The proposed Artificial Neural Network model is built in two
stages: In the first stage, a Genetic Algorithm optimiser is used to determine
the best topology for the Artificial Neural Network. In the second stage, the
optimised Artificial Neural Network topology is trained for the best values
for the weights. In evaluating the property price, several factors are taken
into consideration such as area size, location, lot area, establishment year,
price for building a square meter, and type of building (commercial or
agricultural) and others. Records from Jordanian Department of Lands & Survey
are used for training the Artificial Neural Network model and for testing its
performance to find the best model that represents the underlying relation
between a land/property and its characterising features. Statistical tests
were performed to validate the effectiveness of the proposed method.
Keywords:
Artificial neural network, Genetic algorithm, Estate appraisal, Automatic
valuation model, Computerassisted mass appraisal, Cost approach, Sales
comparison approach, Income approach
Issue
9, Volume 9, September 2010
Title of the Paper:
Robust
Stabilization of Interval Plants using Kronecker Summation Method
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Authors:
Radek Matusu, Roman Prokop, Katarina Matejickova, Monika Bakosova
Abstract: This paper deals with design of continuous-time robustly stabilizing
Proportional-Integral (PI) controllers for interval systems using the
combination of Kronecker summation method, sixteen plant theorem and an
algebraic approach to controller tuning. The effectiveness and practical
applicability of the proposed method is demonstrated in both simulation and
real experiments including control of a third order nonlinear electronic
plant.
Keywords:
Robust Stabilization, PI Controllers, Interval Systems, Kronecker Summation
Method, Algebraic Synthesis, Electronic Model
Title of the Paper:
The Virtual
Prototype of a Mechatronic Suspension System with Active Force Control
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Authors:
Catalin Alexandru, Petre Alexandru
Abstract: The paper presents the virtual prototype of an automotive suspension
system with force generator actuator. The active suspensions use sensors to
measure the accelerations of sprung mass and unsprung mass, the analog signals
from the sensors being transmitted to the controller, which communicates with
the force actuator. In this way, the passenger comfort and car stability are
simultaneously improved. The study is developed for a quarter-car model, which
contains the guiding & suspension system of a front wheel. The virtual
prototype of the active suspension is a control loop composed by the
multi-body mechanical model connected with the dynamic model of the actuator
and with the controller model. The digital platform used in the study
integrates MBS (Multi-Body Systems) and DFC (Design for Control) software
solutions. The numeric simulations have been performed considering a step
input signal, the control strategy aiming to decrease the overshoot, without
adversely affecting other performance indexes.
Keywords:
Suspension, Active force control, Mechatronic system, Virtual prototype
Title of the Paper:
Two
Methodologies to Support Gas Turbine Power Plant Availabilty Estimation:
Design of Experiment and Montecarlo Simulation
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Authors:
Enrico Briano, Claudia Caballini, Pietro Giribone, Roberto Revetria
Abstract: Maintenance is an important aspect in order to guarantee the
efficiency of industrial facilities. For power plants the high availability
ratios can be obtained only with preventive maintenance but the result costs
increases rapidly. In order to reduce the cost level of the maintenance
activity, on-condition maintenance is carried out on an increasing subset of
components. Only using appropriate reliability models can identify the optimal
mix between preventive and on-condition maintenance. Some time the data
required by such models are inadequate or missing and the performances of the
implemented system can fall quite rapidly. The authors propose an innovative
approach based on a hierarchical Montecarlo simulator able to estimate
properly the power plant reliability and, at the same time, improve its
performances by a fine-tuning of its parameters. A real life case study is
than presented and discussed, even with economical consideration.
Keywords:
Reliability, Fuzzy Logic, Model Estimation, Montecarlo Simulation, Design of
Experiment
Title of the Paper:
Guidelines and
Perspectives to Enhance Italian Port Competitiveness
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Authors:
Enrico Briano, Claudia Caballini, Roberto Mosca, Roberto Revetria, Alessandro
Testa
Abstract: Ports, as well as other important transportation infrastructures
like railways, motorways and airports, play a great role in the economy of a
nation, because, if properly managed, they can strongly affect the Country
competitiveness and its economic development; this is true especially for
Italy, which can take great advantage from its geographic position of
peninsula. In fact Italy can heavily exploit seas using the so-called “Seas
Highways” system – a series of alternative links between Northern and Southern
Italy, and also Mediterranean Countries – devoted to lighten vehicular traffic
on the most important Italian motorways (like the Milan-Naples or the Adriatic
Motorway, just to quote two of the busiest), but also to reduce atmospheric
pollution and to guarantee a cheaper way of transportation, especially for
goods which are not perishable. Although also European Union is strongly
recommending this solution, even inserting Seas Highways inside the Pan
European Corridors (as “Corridor 21”), the Italian ports have many
difficulties to face the international competition, especially with Northern
Europe ports, despite their privileged position on the routes coming from the
Far East, because of different reasons, first of all the inadequacy of the
infrastructures internal and external to the ports (especially railroads,
exploited a little respect to other European Countries), the high
fragmentation of the Italian port realities (every Port has in Italy its own
Port Authority), that causes fund dispersion and organizational problems, and
a regulation out to date. All this problems are also amplified by the actual
international economical crisis, which contributes to increase competition
among the ports. For these reasons the authors are presenting a project
proposal, in cooperation with the Italian University and Scientific Research
Ministry, devoted to analyze the current situation of Italian ports and
logistic facilities, underlining points of strength, points of weakness,
opportunities and criticalities and analyzing the common factors of behavior
of the ports considered. This is a prerequisite to define a simulation model
implemented using the System Dynamics methodology, which is suitable for the
study of high uncertain scenarios, as the Italian port reality is, allowing
the formulation of so-called “What if” analysis. The aim of this model is to
simulate the effects of the infrastructural, organizational and normative
changes on the Italian port system, acting as a powerful Decision Support
System (DSS) for all the stakeholders involved in the system, in order to
identify a common solution devoted to improve Italian ports competitiveness.
Moreover, the authors provided a deep literature review on works concerning
port competitiveness worldwide, analyzing what has been done in the Far East,
in India and in Europe, in order to find interesting starting points for the
research proposed.
Keywords:
System Dynamics, Simulation, Italian Ports, What if analysis, Logistics
Title of the Paper:
Map Fusion in
an Independent Multi-Robot Approach
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Authors:
Monica Ballesta, Arturo Gil, Oscar Reinoso, Luis Paya, Luis M. Jimenez
Abstract: This paper concentrates on the study on the map fusion problem in
the context of a multi-robot map building approach. Concretely it is seen as
one of the steps towards the independent multi-robot map building. In the
situation proposed a set of several robots performs map building tasks without
the notion of other robots’ existence. Each robot builds its own local map
using its observations and estimates its path independently. As a result,
there will be a set of local maps that can be fused into a global one. This is
the case when the map fusion takes importance. Particularly, we focus our
experiments on landmark-based maps constructed using visual information and by
means of a particle filter. When fusing two maps, we consider the uncertainty
of the landmarks integrated by each different robot to its map.
Keywords:
SLAM, map fusion, visual landmarks, particle filter, map alignment
Title of the Paper:
Failure of
Measurement System? Some Lesson from Fall of Enron Corp
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Authors:
Jiri Strouhal, Carmen Bonaci, Dumitru Matis, Razvan Mustata
Abstract: The current financial crisis makes us all remember both previous
economic crisis that have marked our history and large bankruptcies, that were
intensely debated through trade literature, all having similar elements with
what we are nowadays experiencing. We trying to prove that we learn nothing
from history would be pointless since we have repeatedly watched history
repeating itself over and over again. This is even more obvious where capital
markets are concerned, their tendency of relearning the same lesson seeming to
be one of their most intriguing characteristics. We believe a short incursion
into the past might help us look into the present with different eyes. This
paper develops an analysis into the past, focusing on similarities with the
current financial crisis and still believing in lessons that could and should
be learnt.
Keywords:
Financial Crisis, Accounting Scandals, Fair Value, Enron, Bankruptcy,
Financial Instruments
Title of the Paper:
Comparative
Study for EAF's Reactive Energy Compensation Methods and Power Factor
Improvement
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Authors:
Deaconu Sorin Ioan, Popa Gabriel Nicolae, Tihomir Latinovic
Abstract: In this paper is analyzing the current operating conditions of one
electric arc furnace (EAF) in order to evaluate the best option to solve the
energy consumption problem. Experimental results show that EAFs represent a
substantial source of electric disturbances, such as voltage fluctuations,
flicker, harmonics, and unbalance between phases. Improvement of the energetic
performances of an EAF imposes a careful technical and economical analysis.
The possible compensation solutions include passive filter, SVC (static var
compensator) and STATCOM (static synchronous compensator).Finally, the
guideline for compensator selection and performance estimation is obtained.
Keywords:
Electric Arc Furnace, Flicker, Power Factor, Harmonic Analysis, Reactive
Compensator, Improvement
Title of the Paper:
Theory of the
Simple Genetic Algorithm with α-Selection, Uniform Crossover and Bitwise
Mutation
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Authors:
Andre Neubauer
Abstract: Genetic algorithms (GA) are instances of random heuristic search
(RHS) which mimic biological evolution and molecular genetics in simplified
form. These random heuristic search algorithms can be theoretically described
by an infinite population model with the help of a deterministic dynamical
system model by which the stochastic trajectory of a population can be
characterized using a deterministic heuristic function and its fixed points.
For practical problem sizes the determination of the fixed points is
unfeasible even for the simple genetic algorithm (SGA) with
fitness-proportional selection, crossover and bitwise mutation. The recently
introduced simple genetic algorithm with -selection allows the analytical
calculation of the unique fixed point of the corresponding intrinsic system
model. In this paper, an overview of the theoretical results for the simple
genetic algorithm with -selection and its intrinsic system model is given. The
unique fixed point of the intrinsic system model is derived and its
compatibility with the equivalence relation imposed by schemata is shown. In
addition to the theoretical analysis experimental results for the simple
genetic algorithm with -selection, uniform crossover and bitwise mutation are
presented showing a close agreement to the theoretical predictions.
Keywords:
Simple genetic algorithm, -selection, random heuristic search, dynamical
system model, infinite population model, intrinsic system model, schemata
Title of the Paper:
Locally
Optimal Fuzzy Control of a Heat Exchanger
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Authors:
Anna Vasickaninova, Monika Bakosova
Abstract: The paper presents a fuzzy control based on parallel distributed
fuzzy controllers for a heat exchanger. Each subcontroller is LQR designed and
provides local optimal solutions. First, a Takagi-Sugeno fuzzy model is
employed to represent a system. The stability of the system with the proposed
fuzzy controllers is discussed. The simulation results are compared with
classical PID control and illustrate the validity and applicability of the
presented approach.
Keywords:
Takagi-Sugeno fuzzy model, Lyapunov function, LMI problem, shell heat
exchanger, Takagi-Sugeno parallel distributed fuzzy LQR, PID control
Issue
10, Volume 9, October 2010
Title of the Paper:
Numerical
Simulation of Hydraulic Shock in a Water Pumping System Protected by Air
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Authors:
Anca Constantin, Claudiu Stefan Nitescu
Abstract: Air may be efficiently used in water pumping system protection from
hydraulic shock, due to its elasticity. The paper presents the results
regarding the extreme pressures in the discharge duct of a pumping
installation, obtained by numerical simulation of the water hammer phenomenon
in two cases of protection with air: using air chamber and using free air
dispersed throughout the pumped water. The air chamber increases the pipe wall
elasticity in the particular section where the chamber is mounted. The air
bubbles transform single-phase water into a biphasic fluid with greater
compressibility. Specific parameters are related to these methods, in order to
establish criteria for best protection solution choice in water supply
engineering design.
Keywords:
Hydraulic Shock, Pumping Installation, Air Chamber, Biphasic Flow, Dissolution
Title of the Paper:
Noisy
Fractional Oscillator: Temporal Behavior of the Autocorrelation Function
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Authors:
Ako Sauga, Romi Mankin, Ain Ainsaar
Abstract: The influence of external and internal noises on the output signal
of a fractional Langevin equation with the friction kernel of a viscoelastic
type is considered. The interaction with fluctuations of environmental
parameters is modeled by a multiplicative white noise and by an additive noise
with a zero mean. In the case of an external harmonic driving force it is
shown that additive external and internal noises cause qualitatively different
behaviors of the autocorrelation function for the output signal. Particularly,
in the case of external noise it is established that at a sufficiently strong
memory of the friction kernel the output signal corresponds to trapped
dynamics in an effective potential well even if the system is subdiffusive in
the case of internal noise.
Keywords:
Fractional Langevin equation, fractional oscillator, energetic stability,
internal noise, external noise, viscoelastic friction
Title of the Paper:
Systematic
Hydraulic Study for the Preliminary Sizing of the Surge Tanks Mounted Close to
the Pumping Station
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Authors:
Claudiu Stefan Nitescu, Anca Constantin
Abstract: The surge tanks, assumed to have no hydraulic loss at the bottom
connection to the main discharge duct, are the simplest and safest protective
device. An important number of pumping stations, part of the Romanian
irrigation systems, were conceived with a surge tank mounted by the pump, on
the discharge duct, in order to protect the installation from hydraulic shock.
In practice, the sizing of such protection device usually implies a large
volume of hydraulic calculation. Special charts (function of the hydraulic
characteristics: discharge, geodetic head, diameter and length of the
discharge duct) were conceived on the basis of the mathematical model of the
hydraulic shock. They make the sizing more efficient and significantly reduce
the time for the surge tank dimensioning.
Keywords:
Surge tank, Air chamber, Pumping station, Geodetic head, Head loss
Title of the Paper:
Two Step, PID
and Model Predictive Control using Artificial Neural Network Applied on
Semi-Batch Reactor
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Authors:
Lubomir Macku, David Samek
Abstract: The article deals with the control of the semi-batch reactor that is
used in chromium waste recycling process based on the enzymatic hydrolysis.
The chromium waste comes from the chromium salt tanning while processing the
natural leather. The recycling technique separates chrome in the form of
chromium filter cake from protein. All products of this procedure are
utilisable thus it is a waste free technology. The reactor deals with a
problem of chromium sludge (chromium filter cake) reusing. However, the
control of the semi-batch reactor is highly complex because the chemical
reaction in the reactor is strongly exothermic and the in-reactor temperature
is rising very fast depending on the reaction component dosing. To simulate
the real process a mathematical model including reaction kinetics was used.
The parameters of the achieved model were obtained and verified by
experiments. Three different approaches are applied to the temperature control
problem: two step control without and with penalization, PID control and model
predictive control. The system control is generally difficult because of its
nonlinear behaviour.
Keywords:
Predictive control, PID control, two step control, chemical semi-batch
reactor, process modelling
Title of the Paper:
Adaptive Multi
Sensor Based Nonlinear Identification of Skeletal Muscle Force
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Authors:
Parmod Kumar, Chandrasekhar Potluri, Anish Sebastian, Steve Chiu, Alex Urfer,
D. Subbaram Naidu, Marco P. Schoen
Abstract: Skeletal muscle force and surface electromyographic (sEMG) signals
are closely related. Hence, the later can be used for the force estimation.
Usually, the location for the sEMG sensors is near the respective muscle motor
unit points. EMG signals generated by skeletal muscles are temporal and
spatially distributed which results in cross talk that is recorded by
different sEMG sensors. This research focuses on modeling muscle dynamics in
terms of sEMG signals and the generated muscle force. Here, an array of three
sEMG sensors is used to capture the information of the muscle dynamics in
terms of sEMG signals and generated muscle force. Optimized nonlinear
Half-Gaussian Bayesian filters and a Chebyshev type-II filter are used for the
filtration of the sEMG signals and the muscle force signal, respectively. A
Genetic Algorithm is used for the optimization of the filter parameters. sEMG
and skeletal muscle force is modeled using multi nonlinear Auto Regressive
eXogenous (ARX) and Wiener-Hammerstein models with different nonlinearity
estimators/classes using System Identification (SI) for three sets of sensor
data. An adaptive probabilistic Kullback Information Criterion (KIC) for model
selection is applied to obtain the fusion based skeletal muscle force for each
sensor first and then for the final outputs from each sensor. The approach
yields good skeletal muscle force estimates.
Keywords:
sEMG, ARX, Weiner-Hammerstein, Prosthetic hand, KIC, System Identification
Title of the Paper:
A Case Study
of An Analogical Distance Relay for the 110kV Electric Power Lines
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Authors:
Gabriel Nicolae Popa, Sorin Deaconu, Corina Maria Dinis, Angela Iagar
Abstract: This article presents the basic principles of the analogical
protections used for protecting the high-voltage electric lines (110 kV). A
study for implementation of an analogical distance protection RD 110, for a
high-voltage line is performed (a practical example). For the analogical relay
the protection adjustment for an electric grid of 110 kV is presented. The
distance relay is operating in association with the current-disconnecting
delayed directional homopolar protection, with the automatic rapid reclosing
protection and with the synchronism relay. An analysis is achieved upon these
types of analogue protections for protecting the high-voltage grids, because
they are still used in practice.
Keywords:
Electric lines, High-voltage, Analogical protections, Distance protections
Title of the Paper:
Constructing
Evaluation Model for Sustainable Development in Community Health and Welfare
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Authors:
Kuei-Yang Wu
Abstract: In the recent years, an important issue in the process for
sustainable development in Taiwan village communities has emerged as that our
villages has been aging and the young people and men in their prime have been
moving out into the cities for job reason, which results in the improper care
for community elders and children physically and mentally. Our government has
thus actively promoted various health welfare measures to improve community
living environment and raise the living quality of community residents. We can
see from these that community health and welfare have become issues needed
immediate solutions in Taiwan’s communities. This study applied Fuzzy Analytic
Hierarchy Process (FAHP) to examine these issues and selected three
communities in Miaoli County, Taiwan for real case survey, analysis and
evaluation in order to propose the best guidelines for the future references
in community self diagnosis, enhancing improvement and strategies planning.
Our results indicated that, to create community health, it needed particularly
to strengthen: community organizational operation flexibility, spontaneous
sense of community, local self-sufficiency and link with the government to
form excellent communities mutually helped by industries, government, school
and citizen, and to realize their advantages and improve their disadvantages
thru these guidelines.
Keywords:
Community health and welfare, Fuzzy Analytic Hierarchy Process (FAHP),
Sustainable development
Title of the Paper:
Work
Directions and New Results in Electronic Travel Aids for Blind and Visually
Impaired People
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Authors:
Virgil Tiponut, Daniel Ianchis, Zoltan Haraszy, Mihai-Emanuel Basch, Ivan
Bogdanov
Abstract: Many efforts have been invested in the last years, based on sensor
technology and signal processing, to develop electronic travel aids (ETA)
capable to improve the mobility of blind users in unknown or dynamically
changing environment. In spite of these efforts, the already proposed ETAs do
not meet the requirements of the blind community and the traditional tools
(white cane and guiding dogs) are still the only used by visually impaired. In
this paper, research efforts to improve the main two components of an ETA
tool: the Obstacles Detection System (ODS) and the Man-machine Interface (MMI)
are presented. Now, for the first time, the ODS under development is
bioinspired from the visual system of insects, particularly from the locust
and from the fly. Some original results of the author’s team, related to the
new concept of Acoustical Virtual Reality (AVR) used as a MMI is then
discussed in more detail. Some conclusions and the further developments in
this area are also presented.
Keywords:
Visually impaired persons, electronic travel aids, obstacles detection system,
man-machine interface, acoustical virtual reality
Title of the Paper:
Modern
Lighting Sources and Controls for Energy Efficient Lighting and a Smart
Control Algorithm Application
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Authors:
Safak Saglam, Bulent Oral
Abstract: Energy is an important measure of prosperity of a nation. Energy has
been the life-blood for continual progress of human civilization. Since the
beginning of industrial revolution around two centuries ago, the global energy
consumption has increased by leaps and bounds to accelerate the human living
standard, particularly in the industrialized nations of the world. In order to
assess the energy ef?ciency of an indoor lighting installation, a criterion
for the installed electrical power is proposed which is broadly applicable and
easy to use. Introducing target values for lamps and gear and taking into
account some basic lighting comfort requirements, the maximum electrical power
to be installed can be predicted for any kind of application. Herewith, one or
more task areas with appropriate target illuminance values may be de?ned. The
key parameter of the criterion is the analytical expression for the target
utilance as a function of common lighting design parameters. Improved system
is provided automatically controlling a light level of an interior space. The
system includes a light sensor, motion sensors, electronic control cards, and
a PC for fuzzy controller. Fuzzy Controller is determined turning on or
turning off lamp groups according to information of light level and motion
sensors.
Keywords:
Modern Lighting, Energy Efficiency, Energy Saving, Smart Controls, Fuzzy
Logic, Sensors
Issue
11, Volume 9, November 2010
Title of the Paper:
Control of
HVDC-Light Transmission for Offshore Wind Farms Based on Input-Output Feedback
Linearization and PSO
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Authors:
Wang Guo-Qiang, Wang Zhi-Xin
Abstract: HVDC-Light has the advantages of flexible operating ways and
reliability, especially in the transmission problem of offshore wind power.
But it needs many PI controllers in the two converters (wind farm side, grid
side). So there are many parameters need to be set which is difficult. This
paper adopted the control mode that the outside loop controlled the voltage
and the inside loop controlled the current. The inside loop made use of
input-output feedback linearization method to make the nonlinear coupled
converter mathematical model be linearization and decoupled. And it can
substitute pole placement for PI parameters setting. Namely that it changed
the problem of adjusting PI parameters to the one of pole placement. The
control objective is to track the given values of active and reactive current
from outside loops. The outside loop PI parameters are optimized with
cooperation random particle swarm optimization(CRPSO) algorithm. Simulation
results of Matlab/Simulink were compared with the conventional PI controller
which show that the control method of this paper is effective.
Keywords:
VSC-HVDC, Nonlinear control, Feedback linearization, Wind farm, PSO
Title of the Paper:
A Novel
Position Control of PMSM Based on Active Disturbance Rejection
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Authors:
Xing-Hua Yang, Xi-Jun Yang, Jian-Guo Jiang
Abstract: Considering the unavoidable and unmeasured disturbances, parameter
variations and position measure error of real motion control applications, a
novel controller is developed for the motion control of permanent-magnet
synchronous motors (PMSM). First, an active disturbance rejection controller
(ADRC) based on extended state observer (ESO) is employed to ensure the high
performance of the entire control system. The ESO estimate both the states and
the disturbances so that the ADRC has a corresponding part to compensate for
the disturbances. And then, the inertia of system is identified online to
improve the performance. At last, considering the case of position measure
error, which is commonly in the applications that an encoder is used for
position detection, an asynchronous sampling method (ASM) is used. The ASM
detects the position at the moment of actual encoder pulse input, thus
eliminating encoder positioning error. Simulation and Experimental results are
shown to verify the method.
Keywords:
Permanent-magnet synchronous motors, Active disturbance rejection controller,
Extended state observer, Asynchronous sampling method, Inertia identification
Title of the Paper:
Design and
Implementation of Efficient Intelligent Robotic Gripper
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Authors:
A. M. Zaki, O. A. Mahgoub, A.M. El-Shafei, A. M. Soliman
Abstract: The gripper is a critical component of the industrial robot. It is
greatly useful in industrial environments for object grasping during handling
process. In this paper, a gripper is designed and implemented to grasp unknown
objects with different masses, dimensions, and coefficients of friction. The
design and control of the gripper system takes into consideration simplicity
in the mechanical system, large variety of grasped objects and low cost. The
proposed grasping process during object lifting and handling is mainly based
on the slip reflex principle, as applying insufficient force leads to object
slipping, and dropping may occur. On the other hand, applying extra force
during grasping may lead to object crushing. A new system controller using
fuzzy logic based on empirical investigation of the human hand skills is
proposed. The target is to control the applied force on the object to avoid
object crushing or dropping. Adaptive neuro-fuzzy inference system ANFIS is
used to model the assigned robotic gripper based on input/output variables
measurements. The performance of the gripper system and the control algorithm
was tested first by simulation. Reduction of the distance of the slippage and
process time was confirmed experimentally. Simulation and experimental results
are presented and discussed.
Keywords:
Intelligent Robotic Gripper, ANFIS Modeling, Fuzzy Control, Tactile Sensors
Issue
12, Volume 9, December 2010
Title of the Paper:
On
Fault-Tolerant Embedding of Meshes and Tori in a Flexible Hypercube with
Unbounded Expansion
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Authors:
Jen-Chih Lin
Abstract: The Flexible Hypercubes are superior to hypercube in terms of
embedding a mesh and torus under faults. Therefore, this paper presented
techniques to enhance the novel algorithm for fault-tolerant meshes and tori
embedded in Flexible Hypercubes with node failures. The paper demonstrates
that O(n2-?log2m ? 2) faults can be tolerated and the algorithm is optimized
mainly for balancing the processor and communication link loads. Also, the
methodology is proven and an algorithm is presented to solve them. These
existent parallel algorithms on mesh or torus architectures to be easily
transformed to or implemented on the Flexible Hypercube architectures with
load 1, congestion 1, dilation 3, and unbounded expansion. The useful
properties revealed and the algorithm proposed in this paper can find their
way when the system designers evaluate a candidate network’s competence and
suitability, balancing regularity and other performance criteria, in choosing
an interconnection network. Therefore, we can easily port the parallel or
distributed algorithms developed for these structuring of mesh and torus to
the Flexible Hypercube.
Keywords:
Flexible Hypercube, hypercube, mesh, torus, fault-tolerance, embedding
Title of the Paper:
An Optimized
Neural Network for Predicting Settlements during Tunneling Excavation
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Authors:
George J. Tsekouras, John Koukoulis, Nikos E. Mastorakis
Abstract: Several empirical and analytical relations exist between different
tunnel characteristics and surface and subsurface deformation, while numerical
analyses (mainly using finite difference programs) have also been applied with
satisfactory results. In the last years, the solution of some soil mechanics
problems has been derived using the approach of the applied computational
intelligence methods, especially the artificial neural networks (ANN). The
objective of this paper is to describe an optimized artificial neural network
(ANN) method in order to estimate the settlements of roof, face and walls
during tunneling excavation. The ANN method uses as input variables the
overload factor, the placement of the temporary lining ring behind the face,
the thickness of the shotcrete, the modulus of elasticity for the surrounding
rock-mass and the position where the measurement of the settlement takes place
referring to the tunnel axis. The respective settlements are being calculated
using different ANN’s. For each ANN an optimization process is conducted
regarding the values of crucial parameters such as the number of neurons, the
time parameter and the initial value of the learning rate, etc. using the
respective values of a pre-chosen evaluation set. The success of each ANN in
predicting the respective settlements is measured by the correlation index
between the experimental and predicted values for the evaluation set. Finally,
the ANN with the closest to 1 correlation index is specified. A sensitivity
analysis for different parameters (the input variables, the population of
input vectors, etc.) is also presented showing the reliability of the proposed
method.
Keywords:
Artificial neural network, tunneling excavation, face settlement, roof
settlement, walls settlement, parameters optimization, settlement prediction
Title of the Paper:
Safety
Requirements for Service of Pistol and its Ammunition
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Authors:
Robert Jankovych
Abstract: Pistol and its ammunition life cycle are initiated by the process of
setting needs and requirements. Pistol and its ammunition belong to dangerous
products that exploit explosives for their functioning. The pistol shooting
could result in pistol failures with serious consequences, such as shooter’s
injury or even shooter’s killing. That is why we consider the safety
requirements for pistol and its ammunition to be one of their most important
characteristics. The requirements for pistol and its ammunition safety are
divided by the author into two groups – requirements for design safety and
requirements for safety risk level. Requirements for design safety mean the
application of weapons and ammunition construction principles that have been
proved and confirmed in practice. These requirements are sufficiently
elaborated on and described in current professional literature. On the other
hand, the requirements for safety risks level of small arms and their
ammunition have neither been published nor elaborated on. The method
introduced by the author identifies in an original way both the area of
acceptable safety risk for pistol and the area of acceptable safety risk for
ammunition. A shooting experiment with the purpose to verify the fulfilling of
the pistol safety risk requirements was conducted. Its goal was to achieve
dangerous pistol failures, i.e. such failure categories which threaten
shooter’s health. The results of the experiment were used to determine maximal
guaranteed lifetime of the given pistol of calibre 9.00 mm Luger.
Keywords:
Categories of Pistol Failures, Categories of Ammunition Failures, Acceptable
Pistol Safety Risk, Acceptable Ammunition Safety Risk, Pistol Lifetime
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