Issue 1, Volume 4, 2010
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
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
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
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