Biclustering is a two way clustering approach involving simultaneous clustering along two dimensions of the data matrix. Finding biclusters of web objects (i.e. web users and web pages) is an emerging topic in the context of web usage mining. It overcomes the problem associated with traditional clustering methods by allowing automatic discovery of browsing pattern based on a subset of attribute...

This thesis proposes a new method for unsupervised image clustering using probabilistic continuous models and information theoretic principles. Image clustering relates to content-based image retrieval systems. It enables the implementation of efficient retrieval algorithms and the creation of a user friendly interface to the database. The thesis presents a coherent theory for continuous probab...

Received Jul 17, 2012 Revised Oct 26, 2012 Accepted Nov 2, 2012 Earlier, a simple dynamic equivalent for a power system external area containing a group of coherent generators was proposed in the literature. This equivalent is based on a new concept of decomposition of generators and a two-level generator aggregation. With the knowledge of only the passive network model of the external area and...

We construct a finite convergent semi-quadratic presentation for the Chinese monoid by adding column generators and using combinatorial properties of insertion algorithms on staircases. extend this into coherent one whose are columns, rewriting rules defined algorithms, syzygies as relations among algorithms. Such is used representations monoids, in particular, it way to describe actions monoid...

The paper presents a method, which can be employed to measure the timing jitter present in periodic clock signals that are used as entropy source in true random number generators aimed at cryptographic applications in reconfigurable hardware. The method uses the principle of a coherent sampling and can be easily implemented inside the chip in order to test online the jitter source. The method w...

In chaos-based digital communication systems, a correlator is normally used in the coherent detection of the signal. In this paper, an optimum design for such correlatortype receivers is presented. A chaos-based digital communication system with one chaos generator has been used to exemplify the performance of the design. The design can be extended to systems with multiple generators, where the...

To study the functional role of synchronized neuronal activity in the human motor system, we simultaneously recorded cortical activity by high-resolution electroencephalography (EEG) and electromyographic (EMG) activity of the activated muscle during a phasic voluntary movement in seven healthy subjects. Here, we present evidence for dynamic beta-range (16-28 Hz) synchronization between cortica...

Clustering is a useful method that categorizes a large quantity of unordered text documents into a small number of meaningful and coherent collections, thereby providing a basis for instinctive and informative navigation and browsing mechanisms. Different type of distance functions and similarity measures have been used for clustering, such as squared, cosine similarity, Euclidean distance and ...

In the paper, we are interested in classification of disturbed periodic biosignals. An ant based clustering algorithm is used to group episodes into which examined biosignals are divided. Disturbances in periodicity of such signals cause some difficulties in formation of coherent clusters of similar episodes. A quality of a clustering process result can be used as an indicator of disturbances. ...