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Wind Power Plants are classified as a power energy sources with non-stabile supply of electric energy. It is necessary to back up power energy from Wind Power Plants for stabile electric network operation. We can set an optimal value of back up power energy with using variety of prediction models. Mathematical model for prediction of Wind Power Plant energy was developed at the Technical University...
One of the current trends in cryptography is to search for new approaches to the cryptographic algorithms design. One such possibility is to use the other algebraic structures, such as a quasigroup, rather than the traditional. Quasigroups are equivalent to more familiar Latin squares. One of quasigroups' important properties is that all possible elements of certain quasigroup occur with equal probability...
In this study we discuss a method for evolution of quasigroups with desired properties based on genetic algorithms. Quasigroups are a well-known combinatorial design equivalent to the more familiar Latin squares. One of their most important properties is that all possible elements of certain quasigroup occur with equal probability. The quasigroups are evolved within a framework of a simple hash function...
The similarity of two maps can be most easily compared visually. In this case, the degree of similarity is very subjective. It is therefore necessary to find an objective method for measuring similarity. This paper presents a method based on Singular Value Decomposition (SVD).
With the growing importance of data security a growing effort to find new approaches to the cryptographic algorithms designs appears. One of the trends is to research the use of other algebraic structures than the traditional, such as a quasigroup. Quasigroups are equivalent to the more familiar Latin squares. There are many characteristics that must quasigroups have from the cryptography point of...
Some methods for object group identification applicable for social group identification are compared. We suppose that people are characterized by their actions, for example the deputies are characterized by their voting habits. We are interested in binary data analysis (e.g. the result of voting is yes or not). The dataset consisting of the roll-call votes records in the Russian parliament in 2004...
In this paper we propose usage of 2-connected components as coarse granulity partition and spectral partitioning method as a fine partitioning of selected components.
Development of modern technologies is expanded with communications possibilities. Electronic systems of communications make possible overcoming traditional barriers of communication, for example, such as distance. On their basis there are new types of communities which any more have no geographical restrictions. Increasing popularity of electronic communities among which projects LiveJournal, LiveInternet,...
Development of modern technologies is expanded with communications possibilities. Electronic systems of communications make possible overcoming of traditional barriers of communication, for example, such as distance. On their basis there are new types of communities which any more have no geographical restrictions. Increasing popularity of electronic communities among which projects LiveJournal, LiveInternet,...
Many types of information retrieval systems (IRS) are created and more and more documents are stored in them too. The fundamental process of IRS is building of textual database, and compression of the documents stored in the database. One possibility for compression of textual data is word-based compression. Several algorithms for word-based compression algorithms based on Huffman encoding, LZW or...
The MCA8 software application is described and applied to model task in this paper. This software application was developed for the purpose of the support of multi-criteria decision-making in the field of electrical power engineering. The MCA8 runs on Windows with .NET framework 2.0 and it is user-friendly. The MCA8 offers six methods of multi-criteria analysis (MCA) for solving multi-criteria decision-making...
Several actions are usually performed when document is appended to textual database in information retrieval system. The most frequent actions are compression of the document and cluster analysis of the textual database to improve quality of answers to users' queries. The information retrieved from the clustering can be very helpful in compression. Word-based compression using information about cluster...
Mean square error is usual method to measure quality of self-organizing map (SOM). MSE brings good theoretical description about learning process, but its rather hard to decide what MSE is small enough, or when learning should be stoped. A new technique for measurement of quality of SOM using singular value decomposition will be presented in this paper.
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