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The paper provides a classification of shape representation and description techniques and areview of some of the most important techniques. We examine shape description techniques on thereconstructed boundaries of brain structures (white matter) in the magnetic-resonance (MR)images using the Fourier descriptors for various frequency components in order to characterizebrain structures.
In this paper, global models of dynamic complex systems using the neural networks isdiscussed. The description of a complex system is given by a description of each system elementand structure. As a model the multilayer neural networks with the tapped delay line (TDL), whichhave the same structure as a complex system, are accepted. Two approaches, a global model and aglobal model with the quality...
In this paper we compare computational power of two models of analog and classicalcomputers. As a model of analog computer we use the model proposed by Rubel in 1993 called theExtended Analog Computer (EAC) while as a model of classical computer, the Turing machines.Showing that the Extended Analog Computer can robustly generate result of any Turing machinewe use the method of simulation proposed...
The most frequently used methods of automatic detection and classification of speech disordersare based on experimental determination of specific distinctive features for a given kind ofdisorder, and working out a suitable algorithm that finds such a disorder in the acoustic signal. Forexample, for detection of prolonged phonemes, analysis of the duration of articulation is used, andon the contrary,...
In this paper we consider a problem of generation by cellular automata of high qualitypseudorandom sequences useful in cryptography. For this purpose one dimensional nonuniformcellular automata is used. The quality of pseudorandom sequences generated by cellular automatadepends on collective behavior of rules assigned to the cellular automata cells. Genetic algorithmis used to find suitable rules...
The work concerns the theory of adaptive control. By using available tools of contemporarymathematics as well as computer science it is possible in the credible way to introduce the laws ofcontrol of a dynamic system as well as to simulate such process in the real world. Therefore wecan learn the working of system by simulation, i.e. we can get precise knowledge about theparameters of the system,...
We propose a general algorithm which aims at optimizing the usage of computer resources fortabulating families of functions possessing known symmetries. The approach is based on the grouptheoretical description of symmetry relations among the functions and their parameters, whereorbits play a crucial role.
There exist some problems related to the determination of the quasiplateau region inexperimental sciences. The paper describes two approaches to this matter which lead to twoalgorithms for finding the maximal length quasiplateau interval for discrete data. Numerical testsare presented.
One of the weak points of DEA (Data Envelopment Analysis) models indicated in literature[1,2] is their sensitivity to variable measurement errors. The occurrence of data interference, whichis the basis of the productivity analysis, may distort the classification of the units and may causemisjudgement of their effectiveness.In the article the results of simulation concerning the DEA models sensitivity...
A part of research on application of mobots (mobile robots) for watching real environment isthe computer-based system for training and selecting candidates for mobot operators. The gameplayed by the candidates is the main part of the system. The core of the game is touring simulator.Firstly, it was assumed that speed of simulation would be a crucial factor for the game. Hence, theinitial version of...
The function performed by the bots in Intelligent Tutorial Systems has been presented in thepaper. Therefore we were able to justify the character of functions of the chatbot being designedby our team. Its purpose is to improve the functionality of an intelligent tutorial system. By meansof tools used for the construction of the chatbot we were able to apply the strategies and techniquesalready used...
Motto: “A really interactive tutor should act not only in an interactive but also active mode. Heshould not sleep between two successive answers in reply to the questions but should be able tomonitor the work of students and react to their errors continuously” [1].
Internet today is the main medium rapidly delivering information that we need. Theinformation is delivered via a vast number of services that make our life become faster and moreconscious. The question is at what price? The solutions devised by humans are prone to errors,which furthermore entail a new type of security challenge – cyber crime. With this paper we try toshow that autonomous intelligent...
Recently, a large number of virtual learning communities appeared in the Web, however,keeping them up occurs to be problematic and information accessibility is one of the factors thatmay influence their sustainability. This feature may be achieved by dividing users into groupsaccording to their information needs and by adapting properly the portal contents. In the paperapplication for data mining...
Inductive learning of formal languages, often called grammatical inference, is an active area inmachine learning and computational learning theory. By learning a language we understandfinding the grammar of the language when some positive (words from language) and negativeexamples (words that are not in language) are given. Learning mechanisms use the naturallanguage learning model: people master...
PySBQL (Python-like Stack Based Query Language) is a full scale programming and querylanguage. Its syntax is based upon the Python’s syntax, which makes PySBQL highly readable andeasy to use. Contrary to the classical approach in query languages, semantics is defined using acommon structure for programming languages – the Environment Stack (ENVS). As a querylanguage it is similar to SBQL proposed...
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