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Editorial Board

Prof. Metin Demiralp (Turkey),

Prof. A.Kuri-Morales (Mexico),

Prof. V.Mladenov (Bulgaria),

Prof. G.Bognar (Hyngary),

Prof. Lotfi A. Zadeh (USA),

Prof. Leonid Kazovsky (USA),

Prof. T.Kaczorek (Poland),

Prof. L.Chua (USA),

Prof. O.Martin (Romania),

Prof. C.Udriste (Romania),

Prof. N.Mastorakis (Greece),

Prof. D.Bertsekas (USA),

Prof. R.Yager (USA),

Prof. Anping Xu (China),  

Prof. M. A. Breuer (USA),

Prof. M.Wasfy (USA)



Topics

All aspects of classic and modern applied mathematics are covered including algebra, differential equations, probability, statistics, operational research, optimization, algorthms theory, computational complexity, control . It appears quarterly.  Special Issues are specially encouraged.

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Issue 1, Volume 4, 2010

Influence of Non-Enzymatic Template-Directed RNA Recombination Processes on Polynucleotides Lengths in Monte Carlo Simulation Model of the RNA World

by Dariusz Myszor, Krzysztof A. Cyran

Abstract: RNA World hypothesis assumes that once there was the time when RNA played main role on the field of life. According to this theory RNA strands acted both as catalysers of chemical reactions and information carriers. Despite many evidences that RNA world existed and predated current life based on DNA there is still a lot of unanswered questions and troubles to solve. Main trouble is the length of RNA strands. We conducted series of computer simulations based on modified model of Monte Carlo simulation of the RNA world. Model bases on real chemical processes operating on RNA strands. In our simulations we wanted to check influence of non-enzymatic template-directed RNA recombination process on RNA World. According to many researchers RNA recombination processes might lead to elongation of RNA chains and creation of novel sequences in the solution. These new RNA chains could have catalytic activities and serve as RNA replicase. Outcomes of computer simulations let us assume that RNA recombination processes are important phenomena in the RNA world and might lead to elongation of RNA chains.
Keywords:
RNA recombination, RNA replicase, RNA world, Monte Carlo method, computer simulation
Full Paper, pp. 1-8

 

Logic Functions of Complementary Arrays

by Shinya Matsufuji, Takahiro Matsumoto

Abstract: Complementary arrays mean a pair of multidimensional sequences, that at the same phase-shift the sum of these aperiodic auto-correlation functions takes zero except zero-shift. This paper clarifies logic functions of complementary arrays with dimension n, whose length is a power of two. The complementary arrays include binary complementary sequences with n = 1 and polyphase complementary arrays consisting of complex elements with unit magnitude. Complete complementary arrays, that the sum of these aperiodic cross-correlation functions for a pair of complementary arrays takes zero at any shift, are also investigated. These logic functions can easily give a lot of complementary arrays, and show that the number of complementary arrays is irrelevant to dimension.
Keywords: Sequence design, complementary sequences, correlation function, logic function

Full Paper, pp. 9-16

 

Issue 3, Volume 4, 2010

Cluster Quality Assessment by the modified Renyi-ClipX Algorithm

by Dalia Baziuke, Aleksas Narscius

Abstract: This paper presents the modified Renyi-CLIPx clustering algorithm and shows that with this algorithm more accurate groupings can be obtained, it gives higher accuracy rates as well. The combination of Renyi entropy based clustering and CLIP3, CLIP4 rule derivation algorithms is used to discover clusters and create rules to explain them. The algorithm itself contains refinements that are used while improving the goodness of obtained clusters and rules. Results on researching the influence of data discretization and so called negative examples data set to the rule complexity and cluster quality are presented as well.
Keywords:
Renyi entropy, CLIP3, CLIP4, clustering, clustering rules, algorithm
Full Paper, pp. 51-57

 

Testing of Oracle Database Utilization

by Jan Panus, Josef Pirkl

Abstract: This paper deals with the influence of the Oracle Optimizer hints (sql hints) usage on the query execution. It is the part of parallel computing for data storage as the result of parallel computing. We test the comparison of the classic SQL queries execution towards SQL queries which use Oracle hints. It also examines how the efficiency is influenced by the presence of indices when using hints, how the hints behave when connecting several tables in a query and how the hints are influenced by the chosen Oracle optimizer mode. The CPU time is the basic criterion for the assessment of the efficiency.
Keywords:
Database, optimizer hints, SQL statement
Full Paper, pp. 58-65

 

Utilization of Modified Local Search as a Tool for Parallel Computing

by Jan Panus

Abstract: The paper deals with using modified type of local search algorithm for utilization within optimization. We will test our algorithm on some testing functions and on travelling salesman problem. We will modify this algorithm with the principles of parallel computing and we will show the results. The algorithm is created with knowledge taken from basic local search algorithm, simulated annealing algorithm and tabu search algorithm.
Keywords:
Parallel computing, Travelling salesman problem, Optimization, Local search algorithm, Testing functions
Full Paper, pp. 66-73

 

Modeling of Health State Quality in Regions

by Jiri Krupka, Miloslava Kasparova, Jan Mandys, Pavel Jirava

Abstract: The paper focuses on the problem of application of system approach on the quality of life modeling. Suggested quality of health state model works with real yearly data from 1997 to 2007 from the regions of the Czech Republic. Selected data from health, environmental and economic areas is used. Selected algorithms of cluster analysis and classification decision trees are applied by models creation.
Keywords:
Cluster analysis, decision tree, environment, health, quality of life
Full Paper, pp. 74-81

 

 

 

 

 

Issue 2, Volume 4, 2010

Distributed System for Train Route Ordering

by Karel Greiner, Josef Volek

Abstract: The article describes the options of an application for train routes ordering within an annual train timetable by railway undertakings in the territory of the Czech Republic. The application forms a part of a new train timetable information system. A distributed application is in question consisting of a database server, application server and a client program. The client´s requirement concerning the data record is executed by the application server in synchronous mode, while individual client data update is carried out in an asynchronous mode by means of an event queue maintained at the application server for each client. The train route can be defined graphically in the rail network window by means of different transport points and sections. Besides the train manipulation function, the application provides different analytical tools and print of the aids for railway staff and passengers. A stage based train formation procedure was designed for the purpose of coordination with the route operator.
Keywords:
Timetable, Train, Information system, Distributed application, Application server
Full Paper, pp. 17-24

 

Independent Component Analysis and Complex Wavelet Decomposition for Classifying Medical Data

by Corina Sararu, Luminita State, Maria Miroiu

Abstract: In this article, we describe a new classification methodology based on the use of Independent Component Analysis and Wavelet decomposition (ICAW) techniques. An ensemble system of classifiers is built such that each classifier independently decides the assignation of the test examples on several representations resulted by taking projections computed by wavelets and Independent Component Analysis (ICA). The representations used by the individual classifiers are obtained by taking the real and imaginary part of the wavelet decompositions,as well as the magnitude and phase. The decision of the ensemble system is based on several types of voting rules (such as the majority voting rule or a weighted voting rule). The experimental results presented in the paper show that the proposed ensemble systems of classifiers provide higher accuracy in the particular problem of classifying biomedical data.
Keywords:
Independent components analysis, Wavelet decomposition, Pattern recognition, Signal processing
Full Paper, pp. 25-32

 

Study of the Quantum Evolutionary Algorithm Parameters Applied to Transient Identification

by Andressa dos Santos Nicolau, Roberto Schirru

Abstract: In this work we present a study on the behavior of the Transient Identification System, proposed in our previous work, when modified the main parameters of the optimization tool. The optimization tool used for this study was the Quantum Evolutionary Algorithm (QEA). Besides verifying the influence of the QEA main parameters separately, we propose the modification of these parameters, fixed in canonical form, as a decreasing function in time. Our results for the Transient Identification System are comparable with those present in the current literature, moreover, shown as that these parameters guide the behavior of the algorithm.
Keywords:
Nuclear Power Plant, Quantum Computer Transient Identification, Artificial Intelligence, Diagnosis Systems.
Full Paper, pp. 33-40

 

Minimax Robust RHC Method for Two Mobile Robots Cooperative Carrying Task Problem

by Tohru Kawabe

Abstract: In this paper, a robust receding horizon control (RHC) method and its application to a cooperative carrying task problem by two mobile robots is discussed. In the problem, a following robot must be controlled autonomously and it should hold constraint conditions of relative position against structured uncertainties and bounded disturbances anytime. Then the proposed robust RHC method is based on the minimax optimization with bounded constraint conditions. The proposed method generates the velocity and direction angle adequately to hold the conditions. A numerical example is shown to demonstrated the effectiveness of the method.
Keywords:
Robust Control, Minimax optimization, Receding horizon control, Cooperative caring task, Mobile robot
Full Paper, pp. 41-49

 

Issue 4, Volume 4, 2010

Modelling of Real Kinematics Situation as a Method of the System Approach to the Algorithm Development Thinking

by Stepan Hubalovsky

Abstract: One of the most important tasks in teaching of algorithm development and programming is to use a suitable method of developing theoretical knowledge of algorithm development and programming. Drawing on his own experience, the author has found that the best method to be used is the system approach. This method, described in the paper, is presented through the computer simulation of physical problems from the sphere of the kinematics of solid bodies. To be more specific, the solution of the problem of the trajectory modelling of the motion of a cylinder over the edge of two planes is presented. The solution is demonstrated progressively – it starts with the physical and mathematical analysis of the problem, then the algorithm development is presented and it finishes with the programming in MS Excel worksheet, through which the solution and visualization of the problem is reached. A case study of the system approach as a suitable method of the algorithm development thinking is presented in the paper step by step; the text also emphasizes interdisciplinary learning of university students.
Keywords:
Algorithm development, animation, interdisciplinary learning, modeling, system approach
Full Paper, pp. 83-91

 

Automatic Cryptoanalysis of the Monoalphabetical Substitution as a Method of the System Approach in the Algorithm Development Thinking

by Stepan Hubalovsky, Michal Musilek

Abstract: The system approach is one of the education methods which can be widely applied in any subjects. The authors have found this method as suitable for training in theoretical knowledge of algorithm development and programming. Cryptoanalysis has been chosen for the presentation of the system approach in this paper. The huge advantage of cryptoanalysis, which is a part of the curriculum in computer science, is that it enables the building of the system approach as well as interdisciplinary relations between such subjects as mother tongue, foreign languages, mathematics, history and geography. The use of the algorithm development and programming in the cryptoanalysis of the monoalphabetical substitution cipher is specifically presented in the paper.
Keywords:
Algorithm development, cryptoanalysis, interdisciplinary learning, monoalphabetical substitution cipher, system approach
Full Paper, pp. 92-102

 

Marketing Activity of Guesthouses and Other Hospitality Units from Harghita, Mures and Covasna Counties

by Stefan Dombay, Laszlo Seer, Zsolt Magyari-Saska, Mihai Seer

Abstract: Since the Internet as a communication and distribution channel left its experimental state it has changed the approach to marketing communication. Considering the rapid growth of Romania’s tourism market, small tourism enterprizes such as guesthouses also began to keep up with the newest marketing communication trends. We present two exploratory studies in order to have a general look on the way online marketing is used in the local tourism industry. (1) Owners of hospitality units already have a competitive vision to some degree on adequate marketing strategies and using related tactics. In the first study, using an online questionnaire on a sample of N=65, we gathered data about the way hospitality units think about their marketing activity, the marketing tools they use, with an emphasis on online marketing tactics and tools. (2) In the second study we emphasize the importance of the use of online marketing tools in influencing the customer’s decisional process in the case of Harghita county guesthouses, especially the website as a central hub in communicating the service and the brand.
Keywords:
Commercial websites, marketing tactics, online marketing, Romania, tourism industry, strategy
Full Paper, pp. 103-110

 

Programming as a Method of Interdisciplinary Relations in Learning

by Vladimir Jehlicka

Abstract: The presented article describes one of the potential system approaches to teaching of programming. The focus is given on the interdisciplinary interconnection between physics, informatics and mathematics. First, a simple analysis of the researched process is carried out - that means the decomposition of the light into a colour spectrum with a simultaneous arising of a rainbow on one side and, on the other side, the additive composition of colours demonstrated by lightening a white area with the help of three light sources of varied colours. This is followed by a mathematical description of the composition of colours from three basic components – red, green and blue - on the screen of the computer monitor. The numerical code of the resulting colour is expressed in the binary, hexadecimal and decimal numerical systems. The final part of the paper presents a simple program which enables using a computer monitor for an analysis of the additive composition of colours. It simultaneously also demonstrates advantages and disadvantages of expressing the numerical code of the composed colour in various numerical systems.
Keywords:
Additive composition of colours, computer simulation of experiments, decomposition of the light, definition of colours on a computer monitor, experimental composition of colours, numerical systems
Full Paper, pp. 111-120