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The extended Rijndael-like block ciphers

The extended Rijndael-like block ciphers

引用

international conference on information technology: coding and computing (itcc)

作者： Duong Anh Duc Tran Minh Triet Luong Han Co Faculty of Information Technology University of Natural Sciences Vietnam

ISBN: (纸本)0769515061

The National Institute of Standards and technology (NIST) has just publicly announced the Rijndael block cipher proposed by Vincent Rijmen and Joan Daemen to be the Advanced Encryption Standard (AES) from October 2nd 2000. Basing on its mathematical and cryptography basis we have studied and devised extended versions of this new standard to improve its strength and resistance against the rapidly increasing capability and strength of computers. We describe the results of our recent experiments related to this problem.

关键词： Cryptography Niobium NIST information technology Protection Length measurement Government Algorithm design and analysis Computational efficiency information security

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A new method of optimal coding

A new method of optimal coding

引用

international conference on information technology: coding and computing (itcc)

作者： A.M. Grigoryan E.E. Regentova Department of Electrical and Computer Engineering University of Texas San Antonio San Antonio TX USA Electrical and Computer Engineering University of Nevada NV USA

A new technique for optimally encoding a given source, statistical properties of which are described by the first-order model is introduced. The calculation of a minimum length of codewords is based on the consecutive redistribution of the self- information of symbols in accordance with their probabilities at each stage of the encoding. The proposed method performs equally well for an arbitrary order of symbol probabilities. While codewords are generated by a separate combinatorial procedure, the overall computational cost of the proposed method is lower than that for the Huffman code.

关键词： Encoding Entropy Probability Computational efficiency Huffman coding information technology Difference equations

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Management of explicit and implicit knowledge in consulting companies

Management of explicit and implicit knowledge in consulting ...

引用

international conference on information technology: coding and computing (itcc)

作者： F. Bodendorf S. Uelpenich Department of Information Systems University of Erlangen Nuremberg Nuremberg Germany

Knowledge management is very important in the consulting business. On the one hand knowledge is the crucial factor of production that differentiates consulting companies from their competitors. On the other hand knowledge management is a consulting service that can be sold to other companies. A holistic approach for the introduction and establishment of knowledge management in consulting companies is presented that covers changes in organization, roles, processes and information technology. It focuses on an innovative approach to capturing implicit knowledge with intelligent software agents.

关键词： Knowledge management Companies information technology Management information systems Production Intelligent agent Software agents Investments Computer networks Quality management

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On synchronous coding

On synchronous coding

引用

international conference on information technology: coding and computing (itcc)

作者： Dongyang Long Weijia Jia Ming Li Department of Computer Science City University of Hong Kong Kowloon Hong Kong China

ISBN: (纸本)0769515061

Novel synchronous coding schemes are introduced and relationships between optimal synchronous codes and Huffman codes are also discussed. Although the problem of existence of optimal synchronous codes has not been resolved yet, we show that any synchronous code can consider as an optimal synchronous code for some information source and that there always exist optimal synchronous codes for the information source with a dyadic probability distribution. Comparing with Huffman coding, the synchronous coding is used not only for statistical modeling but also for dictionary methods. Moreover, it is proven that breaking a synchronous code is NP-complete.

关键词： Huffman coding Probability distribution Dictionaries Data compression Computer science Partial response channels Sufficient conditions

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Automatic query expansion based on directed divergence

Automatic query expansion based on directed divergence

引用

international conference on information technology: coding and computing (itcc)

作者： D. Cai C.J. van Rijsbergen University of Glasgow Glasgow UK

To extract informative terms through known relevance information for query expansion is an important issue in the design of an effective text retrieval system. Various discriminant functions have been developed as a device for eliciting good terms. In this paper the notion of informativeness of terms is interpreted and discriminant functions are formalised both based on information-theoretic ideas for automatic query expansion. Preliminary results show that the approach adopted in this paper is worthy of continued investigation.

关键词： information retrieval information theory Feedback Data mining Power system modeling Power measurement Mathematical model Probability Frequency measurement

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Experimental results towards content-based sub-image retrieval

Experimental results towards content-based sub-image retriev...

引用

international conference on information technology: coding and computing (itcc)

作者： Tao Wang Juhua Shi M.A. Nascimento Department of Computing Science University of Alberta Canada

We are interested in the problem of sub-image retrieval (CBSIR), i.e., given a query image one must find the best candidate images that contain that query image. We use two kinds of image feature vectors: global color histograms and autocorrelograms and experimented with several distance measures for both feature vectors in our experimental system. After extensive experimentation we found that using autocorrelograms with the so-called S/sub 1/ distance measure yielded excellent results for sub-image retrieval with an acceptable processing overhead.

关键词： Content based retrieval Image retrieval Histograms information retrieval Humans Image databases Indexing Shape information technology Feature extraction

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t-error correcting/d-error detecting (d>t) and all unidirectional error detecting codes with neural network. II

t-error correcting/d-error detecting (d>t) and all unidirect...

引用

international conference on information technology: coding and computing (itcc)

作者： Maung Maung Htay S.S. Iyengar Si Qing Zheng Department of Information Technology Redford University Redford VA USA Department of Computer Science Louisiana State University Baton Rouge LA USA Department of Computer Science University of Technology Dallas TX USA

For pt.I. see itcc, IEEE proceeding, p. 529-36 (April 2001). In this paper, we develop an algorithm for t-error correcting/d-error detecting and all unidirectional error detecting (t-EC/d-ED/AUED) codes in the framework of neural work. As t-EC/d-ED/AUED codewords are formed by concatenation of information bits and one or more groups of check bits depending on how we want to construct code, we demonstrate neural network algorithms for constructing, detecting and correcting codes. As a continuation of the previous paper, we present an algorithm, code construction, detecting and correcting for 2EC/5ED/AUED code II. We also plan to present for other codes with more examples in near future as well.

关键词： Error correction codes Neural networks Computer errors information technology Computer science Error correction Sufficient conditions Redundancy Encoding Decoding

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On Arabic-English cross-language information retrieval: a machine translation approach

On Arabic-English cross-language information retrieval: a ma...

引用

international conference on information technology: coding and computing (itcc)

作者： M. Aljlayl O. Frieder D. Grossman Information Retrieval Laboratory Illinois Institute of Technology USA

Machine translation (MT) is an automatic process that translates from one human language to another by using context information. We empirically evaluate the use of an MT-based approach for query translation in an Arabic-English cross-language information retrieval (CLIR) system, called ALKAFI, using the TREC-7 and TREC-9 topics and collections. The effect of the query length on the MT performance is also investigated in order to explore how much context is actually required for successful MT processing.

关键词： information retrieval Natural languages Dictionaries Writing Humans Laboratories Demography Tongue Shape Speech

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Delivery of MPEG-4 object based multimedia in a multicast environment

Delivery of MPEG-4 object based multimedia in a multicast en...

引用

international conference on information technology: coding and computing (itcc)

作者： K. Asrar-Haghighi Y. Pourmohammadi H.M. Alnuweiri Department of Electrical and Computer Engineering University of British Columbia Vancouver BC Canada

This paper presents the design of an MPEG-4 multicast streaming system. The signalling and delivery layer of this system conforms to the recommendations made by Part 6 of the MPEG-4 standard - the Delivery Multimedia Integration Framework (DMIF). We present the issues involved in designing our multicast streaming server and client taking into account the levels of abstraction required. The system enables multi-client transparent media streaming across the Internet through its data and control planes. This is done through extending the DMIF layer to provide multicast group functionality and signalling.

关键词： Multimedia computing information technology

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A model-driven joint source and channel coder for MPEG-2 video transmission

A model-driven joint source and channel coder for MPEG-2 vid...

引用

international conference on information technology: coding and computing (itcc)

作者： Chung-Lin Huang Sling Liang Electrical Engineering Department National Tsing Hua University Hsinchu Taiwan

ISBN: (纸本)0780374029

This paper proposes a joint source and channel coding (JSCC) method for MPEG-2 video transmission. Based on the current channel status, this JSCC method finds the best source and channel code rate distribution. Due to the different bit error sensitivity of the source code, we apply unequal error protection (UEP) for the source bits by using so-called rate compatible punctured convolution (RCPC) channel coder for efficient protection during channel transmission. In the simulations, we illustrate that under the conditions of the same channel status and total bit rate, our method provides the minimal overall distortion of the MPEG-2 video compared to the equal error protection (EEP) coding.

关键词： information technology

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