Institute of Electron Technology
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Charakterystyka pakietu regulacyjnego 2009 dla sektora komunikacji elektronicznej. Telekomunikacja i Techniki Informacyjne, 2010, nr 1-2
Get PDFW artykule omówiono zmiany, które nastąpiły w pakiecie regulacyjnym 2002 w wyniku jego nowelizacji w 2009 r. Szczególną uwagę zwrócono na problematykę regulacyjną powiązaną z nowelizacją dyrektywy ramowej oraz dyrektyw o dostępie i o zezwoleniach
Zmiany w metodzie badania terminowości przesyłek listowych. Telekomunikacja i Techniki Informacyjne, 2010, nr 1-2
Get PDFOpisano zmiany w metodzie badania terminowości pojedynczych przesyłek listowych, umożliwiające prowadzenie badań w warunkach uwolnionego rynku pocztowego. W nowej metodzie badania uwzględniano przewidywane zmiany charakterystyki ruchu pocztowego i wykonywanie badań w środowisku wielu operatorów pocztowych
Probabilistic Issues in Biometric Template Design, Journal of Telecommunications and Information Technology, 2010, nr 4
Get PDFSince the notion of biometric template is not well defined, various concepts are used in biometrics practice. In this paper we present a systematic view on a family of template concepts based on the L1 or L2 dissimilarities. In particular, for sample vectors of independent components we find out how likely it is for the median code to be a sample vector
Personal Ontologies for KnowledgeAcquisition and Sharing in CollaborativePrOnto Framework, Journal of Telecommunications and Information Technology, 2010, nr 3
Get PDFThis paper summarizes our preliminary experiences with implementing some of the ideas lying behind the concept of creative environment. Research group at the NationalInstitute of Telecommunications has developed a prototype framework for collaborative knowledge acquisition and sharing, called PrOnto. At the moment the artifacts we organize and share are typical sources of scientific knowledge, namely journal papers and web pages. In PrOnto we introduce two interrelated explicit levels of knowledge representation: keywords and ontological concepts. Each user of the framework maintains his own ontological profile, consisting of concepts and each concept is, in turn, by subjective user’s decision, related to a set of weighted keywords that define its meaning. Furthermore, dedicated indexing engine is responsible for objectively establishing correspondence between documents and keywords, or in other words, the measure of representativeness of the keyword to document’s content. Developing an appropriate knowledge model is a preliminary step to share it efficiently. We believe that higher level representation facilitates exploration of other people’s areas of interest. PrOnto gives an opportunity to browse knowledge artifacts from the conceptual point of view of any user registered in the system. The paper presents the ideas behind the PrOnto framework, gives an outline of its components and finalizes with a number of conclusions and proposals for future enhancements
Robust and Accurate Iris Segmentation Algorithm for Colorand Noisy Eye Images, Journal of Telecommunications and Information Technology, 2010, nr 4
Get PDFEfficient and robust segmentation of iris images captured in the uncontrolled environments is one of the challenges of non-cooperative iris recognition systems. We address this problem by proposing a novel iris segmentation algorithm, which is suitable both for monochrome and color eye images. The method presented use modified Hough transform to roughly localize the possible iris and pupil boundaries, approximating them by circles. A voting mechanisms is applied to select a candidate iris regions. The detailed iris boundary is approximated by the spline curve. Its shape is determined by minimizing introduced boundary energy function. The described algorithm was submitted to the NICE.I iris image segmentation contest, when it was ranked 11th and 10th out of total 97
Image Preprocessingfor Illumination Invariant Face Verification, Journal of Telecommunications and Information Technology, 2010, nr 4
Get PDFPerformance of the face verification system depend on many conditions. One of the most problematic is varying illumination condition. In this paper 14 normalization algorithms based on histogram normalization, illumination properties and the human perception theory were compared using 3 verification methods. The results obtained from the experiments showed that the illumination preprocessing methods significantly improves the verification rate and it’s a very important step in face verification system
History of Semiconductors, Journal of Telecommunications and Information Technology, 2010, nr 1
Get PDFThe history of semiconductors is presented beginning with the first documented observation of a semiconductor effect (Faraday), through the development of the first devices (point-contact rectifiers and transistors, early field-effect transistors) and the theory of semiconductors up to the contemporary devices (SOI and multigate devices)
Solving Support Vector Machine with Many Examples, Journal of Telecommunications and Information Technology, 2010, nr 3
Get PDFVarious methods of dealing with linear support vector machine (SVM) problems with a large number of examples are presented and compared. The author believes that some interesting conclusions from this critical analysis applies to many new optimization problems and indicates in which direction the science of optimization will branch in the future. This direction is driven by the automatic collection of large data to be analyzed, and is most visible in telecommunications. A stream SVM approach is proposed, in which the data substantially exceeds the available fast random access memory (RAM) due to a large number of examples. Formally, the use of RAM is constant in the number of examples (though usually it depends on the dimensionality of the examples space). It builds an inexact polynomial model of the problem. Another author’s approach is exact. It also uses a constant amount of RAM but also auxiliary disk files, that can be long but are smartly accessed. This approach bases on the cutting plane method, similarly as Joachims’ method (which, however, relies on early finishing the optimization)
Capacity and Quality Optimization of CDMA Networks, Journal of Telecommunications and Information Technology, 2010, nr 4
Get PDFCoverage and capacity are important issues in the planning process for cellular third generation (3G) mobile networks. The planning process aims to allow the maximum number of users sending and receiving adequate signal strength in a cell. This paper describes the conceptual expressions require for network coverage and capacity optimization analysis, examines service quality issues, and presents practical solutions to problems common to suboptimality of CDMA networks