Wyniki wyszukiwania - BazTech

1

Performance and operation of stressed dual gap RF MEMS varactors

McFeetors G., Okoniewski M.

Journal of Telecommunications and Information Technology

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2007

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nr 1

3-7

EN

The design, fabrication and measurement of a con- tinuously tunable RF MEMS capacitor is described. The capacitor's dual gap height architecture allows for electro- static tuning with low resistive loss and a large tuning range. A new dual tuning scheme is introduced for use with two voltage sources. This dual tuning, coupled with a stress-induced bridge, is used to reach further device tuning. Measurements indicate a continuously tunable capacitance range of 6.2:1 with a quality factor over 50 at 30 GHz for 310 fF.

2

The use of quantitative association rules in cellular network planning

Okoniewski M.

Journal of Telecommunications and Information Technology

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2003

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nr 3

121-124

EN

This paper describes the problem of planning cellular network base stations with optimization to traffic requirements. This research problem was a main incentive to add some development to the theory of association rules. The new form of quantitative and multi-dimensional association rules, unlike other approaches, does not require the discretization of real value attributes as a preprocessing step. They are discovered with data driven algorithm that gives precise and complete results and has polynomial complexity for a given dimensionality.

3

Modulator structures for radio-on-fiber applications

Hum S.V., Okoniewski M., Davies R. J.

Journal of Telecommunications and Information Technology

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2003

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nr 1

8-14

EN

Traditional electro-optic modulators are not optimized for bandpass applications such as radio-on-fiber delivery systems due to their limited electro-optic response. This paper presents a resonant electrode structure that can be employed in optical modulator designs to enhance the electro-optic response of the modulator over a narrow frequency band, and improve the performance of optical radio systems. A simple model of the structure is developed, and experimental results validating the model and illustrating the effectiveness of the structure are presented.

4

Knowledge discovery in the Internet

Gawrysiak P., Okoniewski M.

Archiwum Informatyki Teoretycznej i Stosowanej

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2000

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T. 12, z. 3

203-233

EN

With the rapid expansion of the World Wide Web, the need for efficient data retrieval strategies becomes stronger and will be still growing. Unfortunately classical information retrieval techniques, developed for well-organized collections of textual data do not seem to be able to cope with diversity and amount of information available throughout the Internet. This paper presents some of the newest approaches to information retrieval in large, unstructured hypertext spaces - such as WWW - that focus more on latent information embedded in hyperlinks and document structure, then on actual understanding of Web pages textual content. These techniques, that are marking the new trends and prospects for the Internet technology, have been given recently the name "Web mining", as in fact they are examples of unsupervised machine learning similar to data mining and text mining. Here we discuss methods belonging to the following three groups: link topology analysis, statistical text analysis and query languages and systems design.

PL

Wraz z gwałtownym zwiększaniem się zasobów WWW wzrasta również potrzeba opracowania efektywnych strategii wyszukiwania danych. Klasyczne metody dostosowane do dobrze zorganizowanych struktur danych tekstowych wydają się być niewystarczające w przypadku danych zawartych w Internecie. Niniejszy artykuł prezentuje najnowsze podejścia do wyszukiwania informacji dostępnej w dużych hipertekstowych strukturach danych jak WWW i skupia się na informacji dostępnej w połączeniach pomiędzy stronami WWW oraz rozumieniu zawartości tekstowej stron WWW. Prezentowane metody uzyskały ostatnio angielską nazwę "Web mining" i są przykładem samodzielnego pozyskiwania wiedzy przez maszyny. Dyskutowane metody należą do trzech grup: analizy topologii połączeń, analizy statystycznej tekstu i języków zapytań oraz projektowania systemów.