International Journal of Mathematics and Computers in Simulation

ISSN: 1998-0159
Volume 8, 2014

Notice: As of 2014 and for the forthcoming years, the publication frequency/periodicity of NAUN Journals is adapted to the 'continuously updated' model. What this means is that instead of being separated into issues, new papers will be added on a continuous basis, allowing a more regular flow and shorter publication times. The papers will appear in reverse order, therefore the most recent one will be on top.

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Volume 8, 2014

Title of the Paper: Designation of Reliable Junction Locations by Junction Risk Factor with Geostatistical Analyst


Authors: Ismail Bulent Gundogdu

Pages: 300-305

Abstract: Geostatistical Analyst (GA) has used recently in continuous surface mapping includes also Kriging applications. The data obtained from the Junction Risk Factor (JRF), recently developed for controlling and predicting traffic jam for whole road network, were evaluated to localize the problematic junctions. The JRF was handled with actual junction related geometric and traffic flow rate data instead of statistical analyses including previous years’ accident data. The input data used by JRF are independent and depends on junction properties. The data from JRF analyses are then provided GA surface maps here to estimate the local problematic junction positions which can be reevaluated or replanned to decrease future traffic jams.

Title of the Paper: HS-Patch: A New Hermite Smart Bicubic Patch Modification


Authors: Vaclav Skala, Michal Smolik, Lukas Karlicek

Pages: 292-299

Abstract: Bicubic four-sided patches are widely used in computer graphics, CAD/CAM systems etc. Their flexibility is high and enables to compress a surface description before final rendering. However, computer graphics hardware supports only triangular meshes. Therefore, four-sided bicubic patches are approximated by a triangular mesh. The border curves of a bicubic patch are of degree 3, while diagonal and anti-diagonal curves are of degree 6. Therefore the resulting shape and texturing depend on the actual mapping, i.e. how the tessellation of a bicubic patch is made. The proposed new modification of the Hermite bicubic patch, the HS-patch, is a result of additional restriction put on the Hermite bicubic patch formulation – the diagonal and anti-diagonal curves are of degree 3. This requirement leads to a new Hermite based bicubic four-sided patch with 12 control points and another 4 control points, i.e. twist vectors, are computed from those 12 control points.

Title of the Paper: Measurement and Evaluation of Forming Limit Curves from Digital Image of Deformation Network


Authors: J. Kmec, E. Fechová, S. Hrehová

Pages: 286-291

Abstract: Efficient computer technology connected with program files of simulation of technological processes provides invaluable information. The program files of simulation bring elements of accuracy, reduction of work expenditure and total cost into the phase of development and preparation of material production. Computer simulation presents significant shortening of the phase of production preparation from drawing to tools production, reduction of costs for production preparation, better utilization of potential material properties, replacement of expensive experiment, detection of errors at designing production processes. It is possible to eliminate inaccuracies at determining sizes from deformation network at the crack area of the steel sheet by suitable choice of the procedure of measurement and evaluation of forming limit curves (FLC). The procedure for removing inaccuracies at determining forming limit curves from digital picture of deformation network by means of computer technology is proposed in the paper. Software program Matlab and its Image Processing Toolbox is used for direct measurement and evaluation of forming limit curves.

Title of the Paper: Modeling and Computer Simulation of Static, Dynamic and Feedback Systems as Tool of Development of Logical Thinking


Authors: S. Hubalovsky

Pages: 276-285

Abstract: Many universities are realizing that modeling and simulation is becoming an important tool in finding the strategy for solving and understanding numerous and diverse problems. The paper introduces the theory of modeling and simulation as one of the possible method in the education. The theory is followed by three case studies illustrating step by step process of development of modeling and computer simulation. The first two cases studies will present possibility of simulation of static and dynamic systems in MS Excel worksheet and chart. The third case study presents creation of simulation model of the feedback regulated process – passing through the labyrinth.

Title of the Paper: Thermochemical Non-Equilibrium Reentry Flows in Three-Dimensions: Seven Species Model – Part I


Authors: Edisson S. G. Maciel, Amilcar P. Pimenta, Nikos E. Mastorakis

Pages: 257-275

Abstract: This work presents a numerical tool implemented to simulate inviscid and viscous flows employing the reactive gas formulation of thermochemical non-equilibrium. The Euler and Navier-Stokes equations, employing a finite volume formulation, on the context of structured and unstructured spatial discretizations, are solved. These variants allow an effective comparison between the two types of spatial discretization aiming verify their potentialities: solution quality, convergence speed, computational cost, etc. The aerospace problem involving the hypersonic flow around a blunt body, in three-dimensions, is simulated. The reactive simulations will involve an air chemical model of seven species: N, O, N2, O2, NO, NO+ and e-. Eighteen chemical reactions, involving dissociation, recombination and ionization, will be simulated by the proposed model. This model was suggested by Blottner. The Arrhenius formula will be employed to determine the reaction rates and the law of mass action will be used to determine the source terms of each gas species equation. In this work is only presented the structured formulation and solutions. The unstructured formulation and solutions are presented in the second part of this study, which treats exclusively the unstructured context.

Title of the Paper: Adaptive Control of Level in Water Tank: Simulation Study


Authors: Jiri Vojtesek, Petr Dostal

Pages: 249-256

Abstract: An adaptive control is a popular, so called “modern” control method which could be used for various types of systems with negative properties from the control point of view. This method is based on the feature from the nature where plants, animals or even human beings “adopts” it behavior to the actual environment. The goal of this paper is to show how adaptive control could be used for controlling of the level in the tank as a representation of the water dam, reservoir etc. Proposed control strategy was tested on the real model of the cylindrical water tank as a part of the Process Control Teaching system PCT40. The mathematical model for simulation was derived with the use of material balance inside and the resulting nonlinear ordinary differential equation is solved numerically with the use of the mathematical software Matlab. This mathematical model was also verified by the measurements on the real model. The adaptive approach here uses polynomial approach, recursive identification and pole-placement method with spectral factorization. The adaptive controller here could be tuned by the choice of the position of the root inside the closed loop.

Title of the Paper: The 4-Ordered Property of Some Chordal Ring Networks


Authors: Shin-Shin Kao, Shih-Chin Wey, Hsiu-Chunj Pan

Pages: 236-248

Abstract: A graph G is k-ordered if for any sequence of k distinct vertices of G, there exists a cycle in G containing these k vertices in the specified order. Obviously, any cycle in a graph is 1-ordered, 2-ordered and 3-ordered. Thus the study ofk-ordered graphs always starts with k = 4. In this paper, we study the 4-orderedness of certain chordal rings, denoted by CR(n;1,q) for n being an even integer with n>=6 and q an odd integer with 3<=q<=n/2. More specifically, we prove that CR(n;1,5) is 4-ordered for n>=14, and CR(n;1,7) is 4-ordered for n>=18. The proof is based on computer experimental results by M. Tsai, which can be found in [9], and mathematical induction.

Title of the Paper: Analysis, Settings and Simulations of Relay SISO Autotuners


Authors: Roman Prokop, Jiří Korbel, Radek Matušů

Pages: 228-235

Abstract: A relay based procedure for estimating and controller autotuning is addressed. Autotuning principles usually combine a relay feedback test with control synthesis. This paper presents some results of the first part of this scheme, i.e. relay plant identification for continuous-time plants. The estimation of the controlled system parameters plays the key role in the quality of control. There are many types of relays used in feedback relay schemes. The contribution deals with four ones of them, namely unbiased and biased relays without or with hysteresis. Many industrial plants can be satisfactory estimated by a first or second order linear stable system with a time delay term. The main relay parameters are the asymmetry, hysteresis and amplitudes. The aim of this paper is to study and analyze the influence of these parameters for the quality of estimation of the gain, time constant and time delay. As a result, some recommendations for settings of relay features can be given. Then, control synthesis follows in algebraic philosophy. This approach brings a tuning positive real parameter which highly influences the control behavior. All simulations were performed in Matlab and Simulink program environment. A program system for automatic estimation, design and simulation was developed.

Title of the Paper: Laminar and Turbulent Simulations of Several TVD Schemes in Two-Dimensions – Part I – Theory


Authors: Edisson S. G. Maciel

Pages: 220-227

Abstract: This work, first part of this study, describes five numerical tools to perform perfect gas simulations of the laminar and turbulent viscous flow in two-dimensions. The Van Leer, Harten, Frink, Parikh and Pirzadeh, Liou and Steffen Jr. and Radespiel and Kroll schemes, in their first- and second-order versions, are implemented to accomplish the numerical simulations. The Navier-Stokes equations, on a finite volume context and employing structured spatial discretization, are applied to solve the supersonic flow along a ramp in two-dimensions. Three turbulence models are applied to close the system, namely: Cebeci and Smith, Baldwin and Lomax and Sparlat and Allmaras. On the one hand, the second-order version of the Van Leer, Frink, Parikh and Pirzadeh, Liou and Sreffen Jr., and Radespiel and Kroll schemes is obtained from a “MUSCL” extrapolation procedure, whereas on the other hand, the second order version of the Harten scheme is obtained from the modified flux function approach. The convergence process is accelerated to the steady state condition through a spatially variable time step procedure, which has proved effective gains in terms of computational acceleration (see Maciel). The results have shown that, with the exception of the Harten scheme, all other schemes have yielded the best result in terms of the prediction of the shock angle at the ramp. Moreover, the wall pressure distribution is better predicted by the Harten scheme.

Title of the Paper: Investigation of Thermal Degradation of Vegetable Oils by Spectroscopic Methods and Its Mathematical Analysis


Authors: M. Tobolova, V. Kresalek, H. Vaskova, M. Buckova

Pages: 213-219

Abstract: In this paper, relatively new spectroscopic methods were used for investigation of edible oils and their thermal degradation. There were included the samples of refined rapeseed and sunflower oil and the same oils heated for specified time interval at the temperature 200 °C. The optical characteristics of oils have been investigated with Terahertz Time Domain Spectroscopy (THz-TDS). The refractive indices were calculated in the specified terahertz frequency range, processed and statistically evaluated. The Wilcoxon matched pairs test was carried out for comparison of unheated and heated oil samples. The results measured by THz-TDS were supplemented by Raman spectra analysis. Both methods seem to be capable analyzing tool for oil investigation.

Title of the Paper: Laminar and Turbulent Simulations of Several TVD Schemes in Two-Dimensions – Part III


Authors: Edisson S. G. Maciel

Pages: 202-212

Abstract: This work, third of this study, describes three numerical tools to perform perfect gas simulations of the laminar and turbulent viscous flow in two-dimensions. The Roe, Steger and Warming, and Hughson and Beran schemes, in their TVD (“Total Variation Diminishing”) formulations, are implemented to accomplish the numerical simulations. The Navier-Stokes equations, on a finite volume context and employing structured spatial discretization, are applied to solve the supersonic flow along a ramp in two-dimensions. Three turbulence models are applied to close the system, namely: Cebeci and Smith, Baldwin and Lomax and Sparlat and Allmaras. The second-order versions of the Roe and Steger and Warming schemes are obtained from a “MUSCL” extrapolation procedure. The convergence process is accelerated to the steady state condition through a spatially variable time step procedure, which has proved effective gains in terms of computational acceleration (see Maciel). The results have shown that the Roe scheme yields the best results in terms of the prediction of the shock angle at the ramp. Moreover, the wall pressure distribution is better predicted by the Steger and Warming scheme.

Title of the Paper: Mathematical and Computational Analysis of Moebius Strip


Authors: Hooi Min Yee, M. A. Samsudin

Pages: 197-201

Abstract: This research highlights the problem of mathematical modelling of the Moebius strip. Shape-finding of tensioned membrane surface bordered by Moebius strip is investigated. Moebius strip has the mathematical property of being non-orientable and with only one side and only one boundary component. In this research, the possibility of adopting the form of Moebius strip as surface shape for tensioned membrane structure has been scrutinised. The combination of shape and internal forces for the purpose of stiffness and strength is an important feature of tensioned membrane surface. For this purpose, shape-finding needs to be carried out. Nonlinear analysis method is used for computational shape-finding analysis in this research. Development and pattern of prestress in the resulting tensioned membrane surface is also studied. Shape-finding has been found to converge for Moebius strip with midcircle radius R over half-width W, R/W= 0.7, 1.2, 1.7, 2.2 and 2.7. The way of mathematical modelling presented in this paper forms the basis for computer designer to consider the Moebius strip, R/W= 0.7, 1.2, 1.7, 2.2 and 2.7 applied in tensioned membrane structure. Such in-sight will lead to improvement of rural basic infrastructure, economic gains, sustainability of built environment and green technology initiative.

Title of the Paper: Simulation and Numerical Analysis of Pneumatic Actuator Behavior


Authors: Jakub Javorik

Pages: 189-196

Abstract: Goal of the work is to analyze the function of the pneumatic actuator. A relation between the device construction and the hysteresis in the pressure/stroke relation was studied. A Numerical model of the actuator was created and its results were analyzed. Hyperelastic material properties of the rubber diaphragm were applied in the model and influence of friction between rubber and steel parts of the actuator was evaluated. Reasons of hysteresis were identified and some modifications of the actuator are suggested.

Title of the Paper: Supersonic and Hypersonic Flows on 2D Unstructured Context: Part III


Authors: Edisson S. G. Maciel, Nikos E. Mastorakis

Pages: 171-188

Abstract: In this work, the third of this study, numerical simulations involving supersonic and hypersonic flows on an unstructured context are analyzed. The Van Leer and the Radespiel and Kroll schemes are implemented on a finite volume formulation, using unstructured spatial discretization. The algorithms are implemented in their first and second order spatial accuracies. The second order spatial accuracy is obtained by a linear reconstruction procedure based on the work of Barth and Jespersen. Several non-linear limiters are studied using the linear interpolation based on the work of Jacon and Knight. To the turbulent simulations, the Wilcox, the Menter and Rumsey and the Yoder, Georgiadids and Orkwis models are employed. The compression corner problem to the supersonic inviscid simulations and the re-entry capsule problem to the hypersonic viscous simulations are studied. The results have demonstrated that the Van Leer algorithm yields the best results in terms of the prediction of the shock angle of the oblique shock wave in the compression corner problem and the best value of the stagnation pressure at the configuration nose in the re-entry capsule configuration. The spatially variable time step is the best choice to accelerate the convergence of the numerical schemes, as reported by Maciel. In terms of turbulent results, the Wilcox model yields the best results, proving the good capacity of this turbulence model in simulate high hypersonic flows. This paper is continuation of Maciel’s works started in 2011 and treats mainly the influence of turbulence models on the solution quality.

Title of the Paper: Influence of Irradiation on Mechanical Properties of PA 11


Authors: P. Kratky, D. Manas, M. Manas, M. Stanek, M. Ovsik, A. Skrobak, M. Reznicek

Pages: 162-170

Abstract: The experimental study deals with mechanical properties of the hard surface layer of modified polyamide 11. The mechanical properties were acquired by nanohardness test with using the DSI method (Depth Sensing Indentation). The surface layer of PA11 specimen made by injection technology was modified by irradiation cross-linking using beta irradiation, which significantly influences mechanical properties of the surface layer. This technology allows polymer materials modification followed by the change of their end-use properties. The subject of this research is the influence of irradiation dosage on the changes of mechanical properties of PA11.

Title of the Paper: Interoperability between Different Port Information Systems


Authors: Mehdi Abid, Benayad Nsiri, Yassine Serhane

Pages: 156-161

Abstract: This paper discusses one of the most common level of data exchange between the different port systems issues in order to exploit the internal resources and the collective resources of all the different systems. Our goal is to overcome any type of heterogeneity conflict: semantic, technical and structural during the exchange of information between each different heterogeneous system. In this paper we propose a practical architecture to facilitate the exchange and communication between all the different port systems without modifying the local information systems. Our architecture is based on three levels: 1) User level 2) Mediation level, 3) Source level. The first level is dedicated to applications and users, the second includes various tools to process queries and solve conflicts (technical, structural, semantic) through mediators and ontologies. The third level concerns local information systems and adapters that provide unified interface information systems. The use of XACML format will establish a secure data exchange and standardization of a good decision for the access control of different types of documents belonging to various port information systems.

Title of the Paper: An Equation-Based Circuit Design Technique for DC/DC Converters with Symbolic Computation System


Authors: Tamiyo Nakabayashi, Keiji Nakabayashi, Fujio Kako

Pages: 148-155

Abstract: We present a new technique of equation-based circuit design for DC/DC converters. It models the characteristics on frequency domain of a buck DC/DC converter with a loop compensation, and expresses as a transfer function. And it optimizes efficiently design parameters of MLCC capacitor, which is a kind of output capacitors, in order to satisfy the circuit design specification. We implemented the technique as an equation-based design program for buck DC/DC converters using Scilab. Our experimental results demonstrate that our technique has the capacity of dealing with the practical industrial design/analysis, and its performance is superior to that of a power electronics circuit simulator.

Title of the Paper: Simulation and Visualization in Cognitive Nanoinformatics


Authors: Vadim A. Shakhnov, Lyudmila A. Zinchenko, Elena V. Rezchikova

Pages: 141-147

Abstract: Features of Cognitive Informatics for nanoscale science and engineering are discussed. An approach using the fundamental principle of quantum mechanics and the principle of quantization of information is proposed. We illustrate our approach for distributed MEMS case study.

Title of the Paper: Numerical and Experimental Study of the Load of an Object due to the Effects of a Flow Field in the Atmospheric Boundary Layer


Authors: Vladimira Michalcova, Sergej Kuznetsov, Stanislav Pospisil

Pages: 135-140

Abstract: This paper describes a comparison of two different solutions of a standard problem in building aerodynamics, i.e. the load of a cube-shaped object exposed to the effects of an air flow field. Two problems are discussed in this article. First is the solution of the flow field with the constant wind velocity and low turbulence intensity, while the second problem is about the flow in the simulated atmospheric boundary layer, i.e. the flow field with the high intensity of the turbulence and with the gradient velocity. Physical modelling takes place in the climatic wind tunnel of the Institute of Theoretic and Applied Mechanics AS CR in Telč and numerical modelling is solved using the Ansys Fluent software at the Faculty of Civil Engineering of VŠB – Technical University of Ostrava.

Title of the Paper: Design of Template Generator and its Role in Software Lifecycle


Authors: I. Grbavac, K. Fertalj, V. Batoš

Pages: 127-134

Abstract: In today's society, where access to the technology is becoming a basic human need, the need for software applications and developers is rapidly increasing while the labor market does not meet the needs of entrepreneurs. Workload of software companies is constantly increasing, as they not only have to develop new applications, but must also maintain the existing ones. In order to respond to the growing demands, code generators, tools which automatically generate production-ready source code based on given template, have been developed. But implementation of code generators and templates is very hard and time consuming job which requires a wide knowledge of metalanguages of which templates are usually made. Also, structure of templates sometimes can be very complex. During process of code maintenance, development of new modules, or simply development of new applications based on old ones, developer is faced with a choice: to use code generators or code manually. In order to facilitate developers’ tasks this paper presents concept of template generator and proposes its design. It is a new tool which could be used to discover crosscutting concerns in existing source code and automatically generate code templates leaned to aspect oriented paradigm. Use of template generator would provide well-structured generated code, faster and cheaper application development and maintenance, and would eliminate a requirement for a wide knowledge of template metalanguages.

Title of the Paper: Software Application of the DOProC Method


Authors: Martin Krejsa, Petr Janas, Vlastimil Krejsa

Pages: 121-126

Abstract: Various calculation methods based on the theory of probability and statistics are used for designing and assessing elements and systems in load-carrying structures. Those methods have been becoming very popular recently. Using the probabilistic method, it is possible to analyze a reliability margin defined in a computational model where at least some input characters are random. New methods which are being developed now include the Direct Optimized Probabilistic Method (“DOProC”). This is a purely numerical method which uses no simulation techniques. Results of the probabilistic tasks are more accurate and, often, more fast to reach. The described algorithm has already been implemented in several applications which were successfully used at solution of probabilistic tasks and probabilistic reliability evaluations.

Title of the Paper: Three Classical Computational Geometry Problems Approached Using Range Trees


Authors: Antonio G. Sturzu, Costin A. Boiangiu

Pages: 116-120

Abstract: This article proposes an alternate way for resolving classical computational geometry problems. The particularity is the integration of Range Tree data structures in solving problems like: segment intersections, orthogonal queries and calculation of rectangular areas. For particular scenarios complexity improvements can be observed. Given that these three algorithms were implemented relying on range trees, the research opens the door for introducing similar computational structures in related geometry problems.

Title of the Paper: Performance Comparison of Decision Tree Algorithms for Medical Data Sets


Authors: Hyontai Sug

Pages: 107-115

Abstract: Decision trees have been favored much for the task of data mining in medicine domain, because understandability of found knowledge from the data mining is important. There are two representative decision tree algorithms that have been widely used; C4.5 and CART. While C4.5 has been used some wide range of areas, CART has been favored mostly in medicine domain. Even though the two algorithms have been used in different domains, this fact does not guarantee that CART will be always good data mining tool for all the data sets in medicine domain. In order to compare the performance of the two decision tree algorithms 13 different data sets in medicine domain were used for experiment, and the experiment showed that C4.5 can be a better choice for more cases and CART can be better tool for the cases of lots of missing values in the data sets.

Title of the Paper: Numerical Analysis of Chloride Diffusion Considering Time-Dependent Diffusion Coefficient


Authors: Petr Lehner, Petr Konečný, Pratanu Ghosh, Quang Tran

Pages: 103-106

Abstract: The procedure of 2D chloride ion diffusion modelling is summarized including evaluation of the application of time-dependency on the diffusion coefficient. The effect of the variation of the diffusion coefficient over time is studied. Available established time dependent diffusion coefficient formula is compared between one high performance concrete (HPC) mixture and one ordinary portland cement (OPC) based concrete mixture measured from laboratory investigation.

Title of the Paper: Krill Herd (KH) Algorithm Applied to the Constrained Portfolio Selection Problem


Authors: Milan Tuba, Nebojsa Bacanin, Branislav Pelevic

Pages: 94-102

Abstract: Constrained portfolio selection (optimization) problem extends the classical mean-variance portfolio problem by adding constraints. Such problem becomes computationally intractable which makes the traditional optimization techniques inadequate. Nondeterministic optimization metaheuristics are more appropriate, where swarm intelligence is in the focus of recent research. This paper presents novel krill herd (KH) nature-inspired metaheuristic applied to the constrained portfolio optimization problem. Portfolio selection problem was not much researched by the swarm intelligence algorithms and this is the first application of the krill herd algorithm to this problem. Experimental results show that the krill herd algorithm is a promising technique for portfolio optimization problem since krill herd algorithm results were better compared to other state-of-the-art optimization metaheuristics.

Title of the Paper: A Study Toward Development of an Assessment Method for Measuring Computational Intelligence of Smart Device Interfaces


Authors: Ahmet Al Zarqa, Tarik Ozkul, A. R. Al-Ali

Pages: 87-93

Abstract: Today smart machine market has reached enormous proportions. There is a strong drive among manufacturers to make software interface of “smart devices” as intelligent as possible to attract customers. So far the only feasible way for measuring intelligence of software interface has been conducting a survey among users to see how users rate the quality of the human-machine interface software. This study aims to develop an objective yardstick to measure intelligence of user interface based on observation of user behavior coupled with amount of interchanges between the user and the machine. The experiments indicated that user satisfaction of software interface predicted using this technique is very much in line with the paper based survey results reported by the actual users. This method may provide an objective way of measuring quality of user interface even before the actual users use the software.

Title of the Paper: Efficient Image Transfer Rate Control and Compression Using Pyramidal Layer Format


Authors: Andrei Tigora, Mihai Zaharescu

Pages: 82-86

Abstract: The pyramidal layer format's main purpose is to store images in an efficient manner for both transfer rate control and compression purposes. It involves lossless compression and is elegantly designed to ensure a proper balance between the user experience and the bandwidth constraints, as well as between texture information and edge quality.

Title of the Paper: Simulation of Emission Spectra for LH4 Ring: Intermolecular Coupling Fluctuation Effect


Authors: Pavel Herman, David Zapletal

Pages: 73-81

Abstract: Photosynthesis starts with the absorption of a solar photon by one of the light-harvesting (LH) pigment-protein complexes and transferring the excitation energy to the reaction center where a charge separation is initiated. Knowledge of the microscopic structure of some photosynthetic systems and their function invokes during last twenty years long and intensive investigation of many theoretical and experimental laboratories. The geometric structure of LH complexes is known in great detail, e.g. for the LH2 and LH4 complexes of purple bacteria. Absorption and steady state fluorescence spectra of exciton states for ring molecular systems are presented. The peripheral cyclic antenna unit LH4 of the bacterial photosystem from purple bacteria can be modeled by such system. The cumulantexpansion method of Mukamel et al. is used for the calculation of spectral responses of the system with exciton-phonon coupling. Dynamic disorder, interaction with a bath, in Markovian approximation simultaneously with uncorrelated static disorder in transfer integrals are taking into account in our simulations. We compare calculated absorption and steady state fluorescence spectra for LH4 ring obtained within the full Hamiltonian model with our previous results within nearest neighbour approximation model for uncorrelated static disorder in transfer integrals. All calculations were done in software package Mathematica.

Title of the Paper: Non Symmetric and Global Lanczos Model Reduction for Switched Linear Systems


Authors: Mohamed Kouki, Mehdi Abbes, Abdelkader Mami

Pages: 67-72

Abstract: In this paper, we propose model reduction algorithms for large-scale switched linear systems, which is an important class of hybrid and non linear systems. These methods generate a two-sided projection for each sub-system by the use of the Krylov subspace technique. In first part we present the modified non symmetric Lanczos algorithm, which is numerically efficient and applicable of any order. In second part we present the modified global lanczos algorithm, it is also numerically efficient, applicable of any order and having a best numerical stability. The effectivity and suitability of these new methods is illustrated by one simulation example.

Title of the Paper: Information Modelling of the Manufacturing Centre with the Use of the Heuristic Algorithms


Authors: Petr Suchánek, Robert Bucki, Franciszek Marecki, Eva Litavcová

Pages: 60-66

Abstract: The paper highlights the problem of mathematical modelling of the manufacturing centre. The case which is thoroughly analysed in the paper is based on the production centre consisting of machines which carry out dedicated operations on defined objects. A logistic modelling problem of the production centre is described in detail. The goal is formulated in the criterion form and means the need to minimize the order making time. Heuristic optimisation plays the vital role aiming at finding the optimal solution to the specified task. The method shown hereby emphasises the state of the decision process, the value of the state, functions of generating states and heuristic algorithms for generating trajectories of states. Heuristic algorithms are introduced: the heuristic of preference of machines, the heuristic of preference of objects and the evolutional heuristic. The way of mathematical modelling presented in the paper forms the basis for building a computer simulator of the manufacturing logistic system.

Title of the Paper: A Novel Spatial Behavioral Approach for Agent-Based Crowd Simulation


Authors: Mehdi Mekni

Pages: 46-59

Abstract: Crowd is an emergent, complex, spatially constrained phenomenon raised by the local interactions of a large number of individuals. Managing these interactions implies both low level mechanisms such as navigation and path planning in virtual geospatial environments, and high level behaviors qualified as social behaviors. Most existing simulation models deal with the navigation process, leading to the emergence of macroscopically identifiable groups. However, these models do not provide means to individuals to reason about groups, and so to take into account groups in social behaviors. Moreover, these models do not benefit from a rich and abstracted representation of the virtual environment. In this paper, we propose a novel behavioral approach to simulate high-level decision mechanisms based on social characteristics. These mechanisms enable the support of social agents evolving in and interacting with informed virtual geospatial environments. Such virtual environments are abstracted in order to support large scale geographic spaces. We show that this agent-based model allows taking into account different psychological and sociological theories in order to provide realistic and sophisticated groups management. Finally, we show the interest of our approach to crowd simulation thanks to its application to the simulation of crowd control in urban environments.

Title of the Paper: Evolutionary Control of Chaotic Burgers Map by means of Chaos Enhanced Differential Evolution


Authors: Roman Senkerik, Ivan Zelinka, Michal Pluhacek, Zuzana Kominkova Oplatkova

Pages: 39-45

Abstract: In this paper, evolutionary technique Differential Evolution (DE) is used for the evolutionary tuning of controller parameters for the stabilization of chaotic Burgers map system. The novality of the approach is that the identical selected discrete dissipative chaotic system is used also as the chaotic pseudo random number generator to drive the mutation and crossover process in the DE. The optimization was performed for two types of case studies and developed cost functions.

Title of the Paper: Filter Optimization and Sensitivity Analysis of Pilot Behavior Tested on Flight Simulator


Authors: Jan Boril, Karel Zaplatilek, Rudolf Jalovecky

Pages: 31-38

Abstract: This paper describes another option for the evaluation and analysis of data measured on flight simulator using alternative human behavior models – human as a pilot while flying an aircraft. The measured data was then mathematically analyzed in the MATLAB® environment, providing the input and output data for the filter optimization. Paper also describes the original method of mathematical human behavior model sensitivity analysis, or more precisely, pilot's response to a sudden change of flight altitude. The model is in the form of a rational fraction function of 2nd order and is used for all practical experiments. Individual coefficients of the transfer function represent the pilot's ability to fly the aircraft, i.e. all the coefficients have a specific and practical meaning. The main aim of this paper is optimal filter design with obtaining the best transfer function parameters and analyzing relative sensitivities of all the transfer function coefficients of the pilot's behavior model. Another aim of this paper is to determine coefficient ranges of the pilot's behavior model for further practical use. Due to the measurements, filter optimization and sensitivity analysis the pilot behavior model can obtain more realistic shape useful in the aircraft’s flight control systems at an early stage of its development.

Title of the Paper: Improved Immune Algorithm for Optimizing Distributed Production Scheduling Problem in Flexible Manufacturing System Subject to Machine Maintenance


Authors: Mohd Nor Akmal Khalid, Umi Kalsom Yusof

Pages: 19-30

Abstract: Competitiveness and rapid expansion of flexible manufacturing system (FMS), as one of the industrial alterna- tives, has attracted the attention of many practitioners and aca- demicians. Globalization has further encouraged FMS development into distributed, self-reliant units of production center. Flexible manufacturing system in distributed system (FMSDS) considers multi-factory environments, where jobs are processed by a system of FMSs. Scheduling problems in FMSDS deal with allocation of jobs to factories, independent assignment of job operation to machines, and operations sequencing on a machine. In addition, many previous studies neglect the impact of maintenance as one of the core parts of production scheduling. Maintenance significantly affects the overall performance of production scheduling. As such, maintenance is considered in this paper as part of production scheduling. This paper aims to minimize the global makespan over all the factories. This paper proposes an improved immune algorithm (IIA) to solve scheduling problems in FMSDS subjects to machine maintenance. Antibody encoding is adopted to explicitly represents information about a factory, job, and maintenance, while a greedy decoding procedure exploits scheduling flexibility and determines the job routings. Instead of the traditional mutation operator, an improvised mutation operator is used to improve the solutions by refining the most promising individuals within passing generation (iteration). The proposed approach was compared with an ant colony algorithm and several variants of genetic algorithms. The proposed IIA improved the global makespan from 4% to 33% compared with other algorithms. IIA performance has also been tested with several adjustments of population sizes, clonal selection rates, and local explorative mutation rates.

Title of the Paper: Heuristic Control of the Logistic Manufacturing System with Regeneration of Tools: The Simulation Case Study


Authors: Bronislav Chramcov, Robert Bucki, Saku Kukkonen, Azra Korjenic

Pages: 9-18

Abstract: The paper highlights the problem of mathematical modelling and the subsequent simulation of the complex logistic manufacturing system with regeneration of tools. The system itself consists of identical parallel manufacturing subsystems in which there is a certain number of production stands arranged in a series. Each stand can carry out an operation on the specific order with the use of a dedicated tool. Tools can be regenerated a limited number of times only. Heuristic algorithms are implemented in order to control the choice of the order or the choice of the required stands in the discussed manufacturing system. Manufacturing criteria are used to evaluate implemented control algorithms. The simulator which was created for the purpose of this work is used for obtaining certain result data which is subsequently analysed thoroughly in order to evaluate the simulation case study.

Title of the Paper: Micro-hardness of Glass Fiber-Filled PBT Influenced by Beta Low Radiation Doses


Authors: M. Ovsik, D. Manas, M. Manas, M. Stanek, M. Bednarik, P. Kratky, A. Mizera

Pages: 1-8

Abstract: The presented article deals with the research of micro- mechanical properties in the surface layer of modified PBT filled by 35% of glass fibers. The glass fiber-filled PBT modification was carried out with the aid of β - radiation at different radiation intensities and the resulting properties were measured with the aid of micro-indentation test by the DSI (Depth Sensing Indentation) method. The purpose of the article is to consider to what extent the irradiation process influences the resulting micro-mechanical properties measured by the DSI method.