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international conference on information technology: coding computing, itcc 2004

作者： Cheng, Cher-Sheng Shann, Jean Jyh-Jiun Chung, Chung-Ping Department of Computer Science National Chiao-Tung University Hsinchu 30050 Taiwan

ISBN: (纸本)0769521088

The word positions for any given word in the whole collection are arranged in clusters. If we can use the method that can take advantage of clustering, excellent results can be achieved in compression of inverted file. However, the mechanisms of decoding in all the well-known compression methods that can exploit clustering are more complex, which reduce the ability of searching performance in information retrieval system (IRS) at some degree. In this paper, we proposed a new method that can facilitate coding and decoding of interpolative code by using the simply applied and high-speed models such as γ code and Golomb code in d-gap technique. This new method can exploit clustering well, and the experimental results confirm that our method can provide fast decoding speed and excellent compression efficiency.

关键词： information retrieval systems

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Assessing distance learning student's performance: A natural language processing approach to analyzing class discussion messages

Assessing distance learning student's performance: A natural...

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international conference on information technology: coding computing, itcc 2004

作者： Wu, Yi-Fang Brook Chen, Xin Information Systems Department New Jersey Institute of Technology

ISBN: (纸本)0769521088

In classes supported by electronic messaging systems, students are required or encouraged to discuss the class topics and share their knowledge by posting text messages and replying to others. When the amount of messages is large, it is difficult for the instructor to read through all messages and evaluate student's performance. We apply natural language processing techniques to analyze the course messages to assess student's performance. Students are evaluated from three aspects: knowledge learned from the class, effort devoted to the class, and the activeness of their participation;three measures - keyword density (KD), message length (ML), and message count (MC), are derived from the text messages for each evaluation aspect respectively. The three measures are then combined to compute an overall performance indicator (PI) score for each student. The experiment shows that there is a high correlation between the PI scores and the actual grades;the rank order of students by the PI scores and that by the actual grades are highly correlated as well.

关键词： Distance education

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Security protection and checking in embedded system integration against buffer overflow attacks

Security protection and checking in embedded system integrat...

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international conference on information technology: coding computing, itcc 2004

作者： Shao, Zili Xue, Chun Zhuge, Qingfeng Sha, Edwin H.-M. Xiao, Bin Department of Computer Science University of Texas at Dallas Richardson TX 75083 United States Department of Computing Hong Kong Polytechnic University Hung Horn Kowloon Hong Kong

ISBN: (纸本)0769521088

With more embedded systems networked, it becomes an important research problem to effectively defend embedded systems against buffer overflow attacks and efficiently check if systems have been protected. In this paper, we propose the HSDefender (Hardware/Software Defender) technique that considers the protection and checking together to solve this problem. Our basic idea is to design a secure instruction set and require third-party software developers to use secure instructions to call functions. Then the security checking can be easily performed by system integrators even without the knowledge of the source code. We first classify buffer overflow attacks into two categories, stack smashing attacks and function pointer attacks, and then provide two corresponding defending strategies. We analyze the HSDefender technique in respect of hardware cost, security, and performance, and experiment with it on the SimpleScalar/ARM simulator using benchmarks from MiBench. The results show that HSDefender can defend a system against more types of buffer overflow attacks with less overhead compared with the previous work.

关键词： Embedded systems

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Proceedings itcc 2003. international conference on information technology: coding and computing

Proceedings ITCC 2003. International Conference on Informati...

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

The following topics are dealt with: information technology and education; Web/information retrieval; document management/text compression; coding/error control; mobile commerce - enabling technologies; networks; video processing; modern Web and hypermedia systems; wavelets; image processing; watermarking/image compression; Internet/mobile networking; and data handling and management.

关键词： information technology Error correction coding Internet Data handling Data compression Image coding Document handling Video coding Wavelet transforms Hypertext systems Computer science education

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Ant mobility model platform for network simulator

Ant mobility model platform for network simulator

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international conference on information technology: coding computing, itcc 2004

作者： Liao, Hsien-Chou Ting, Yi-Wei Yen, Shih-Hsuan Yang, Chou-Chen Dept. of Comp. Science Engineering Chaoyang University of Technology 168 Gifeng E. Rd. Wufeng Taichung County Taiwan

ISBN: (纸本)0769521088

Various ad hoc routing algorithms were proposed to increase the performance in ad hoc network. In order to estimate the performance of routing algorithms, they always simulate in ad hoc network environment, and a mobility model is also used for network simulation. There are two types of mobility models: trace and synthetic models. Trace models are more accurate than synthetic ones, and their simulation results are more accurate, too. However, new routing network environments are not easily modeled if traces have not yet been created. That is why most of the simulations are based on synthetic models. In this paper, a tool is implemented for generating a special trace model, called ant mobility model. It mimics the ants' movements of an ant colony. The movement is similar to the workers in a store. We focus on the integration between the ant mobility model and the network environment. When users setup the parameters for generating an ant mobility model, the generated model can be used directly in the network environment. In order to illustrate the feasibility of ant mobility model, it is compared with the random waypoint mobility model based on the same routing algorithm, AODV, by using NS-2 simulator. Three major performance metrics, throughput, network latency, and control overhead message, are estimated. As we expected, these three metrics of the ant mobility model are better than that of the random waypoint mobility model. We suggest that a trace model, like ant mobility model, should be integrated quickly with the network environment in the same way.

关键词： Routers

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Condensed table of Huffman coding, a new approach to efficient decoding

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IEEE TRANSACTIONS ON COMMUNICATIONS 2004年第1期52卷 6-8页

作者： Hashemian, R No Illinois Univ Dept Elect Engn De Kalb IL 60115 USA

This letter introduces a new technique for designing and decoding Huffman codes. The key idea is to define a condensed Huffman table (CHT) that is smaller than the ordinary Huffman table and which leads to fast decoding. For example, the new approach has been. shown to reduce the memory consumption by a factor of eight, compared with the single-side grown Huffman table.

关键词： decoding Huffman codes

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Equivalence of punctured convolutional codes from shift equivalent puncturing patterns

Equivalence of punctured convolutional codes from shift equi...

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

作者： Li Shen Peizhong Lu Xiangyang Luo Yan Zou Institute of Information and Engineering Information and Engineering University China Department of Computer Sciences and Institute of Mathematics Fudan University China

This paper shows that the punctured convolutional codes deduced by shift equivalent puncturing patterns are equivalent.

ISBN: (纸本)0769521088

This paper shows that the punctured convolutional codes deduced by shift equivalent puncturing patterns are equivalent.

关键词： Convolutional codes Polynomials Parity check codes Mathematics Modulation coding information technology

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Games and animation: collaborations between the arts and computer science

Games and animation: collaborations between the arts and com...

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

作者： J.R. Parker Digital Media Laboratory University of Calgary Canada

We explain the need for formal collaboration between students in the arts and computer science students, and argue that this should be encouraged at an early stage of their education. Specific courses that foster this... 详细信息

关键词： Animation Collaboration Subspace constraints Computer science Rendering (computer graphics) Physics computing Computer graphics Laboratories information technology Education

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Towards new algorithms for data compression using adaptive codes

Towards new algorithms for data compression using adaptive c...

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

作者： D. Trinca Faculty of Computer Science Al.I.Cuza University Iasi Romania

We present new algorithms for data compression, based on adaptive codes of order one and Huffman codes. Several comparisons between our algorithms and the well-known Huffman encoder for various input data strings are ... 详细信息

关键词： Data compression Adaptive coding Computer science Encoding

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Embedded error detection in arithmetic coding using markers

Embedded error detection in arithmetic coding using markers

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

作者： S. Chokchaitam P. Teekaput Department of Electrical Engineering Chulalongkom University Bangkok Thailand

This paper provides a joint source channel coding method based on arithmetic coding. The proposed method gives arithmetic coding error detection capability by using its error propagation property and markers. This pap... 详细信息

关键词： Arithmetic Decoding Source coding Redundancy Channel coding Error correction Data compression Transform coding MPEG 4 Standard Feeds

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