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IEEE International Conference on Engineering of Complex computer Systems

作者： Liao Zhigang Li Zengzhi Chen Yan Zhan Tao Institute of Computer Architecture & Network Xi''an Jiaotong University Xi'an China Computer science and technology Department Northwest Polytechnical University Xi'an China

JASIAC (Java-based Active-network Secure Inter Active Application Communication) provides a mechanism to solve the security problem for active application communication for active networks. JASIAC can work against "un-authorization access" and "masquerading" quite well and work efficiently with "malicious access " and "direct DoS attack". It stores the variables and methods to be published in a public variable pool and public method pool respectively, so it makes the security manageable and efficient; it also provides multilevel security mechanisms such as timed variable, hiding inner name, parameter by value and read-only parameter to make the security reliable and flexible.

关键词： Mobile communication Java Application software Security Authorization Fabrication Law Legal factors computer architecture computer science

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A Course in Professional Practice for Juniors

A Course in Professional Practice for Juniors

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Frontiers in Education (FIE) Conference

作者： L.S. Nagurney R. Adrezin Department of Electrical and Computer Engineering College of EngineeringTechnology and Architecture University of Hartford West Hartford CT USA Department of Mechanical Engineering College of EngineeringTechnology and Architecture University of Hartford West Hartford CT USA

To better prepare our students for working with multidisciplinary teams on large projects, the University of Hartford College of Engineering has introduced a junior course entitled Engineering Practice. This one credit course is taken jointly by junior students from all engineering disciplines. The main goal of the course is to have the students work on a large project where the decisions made by other groups will affect choices made by their group and to reinforce the reality that most engineering projects require engineers to work in multi-disciplinary teams. A third goal is to show that engineers must present their work to political or regulatory bodies for a project to be approved. This course has now been taught for 3 years. The results of the evaluation of the course by the students and faculty will be discussed

关键词： Design engineering Biomedical engineering Educational institutions Licenses computer architecture Mechanical engineering Engineering students Job design Oral communication Communication industry

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Uncomputability of Supremal Local Supports in Distributed Diagnosis

Uncomputability of Supremal Local Supports in Distributed Di...

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IEEE Conference on Decision and Control

作者： J.G. Thistle R. Su Department of Electrical and Computer Engineering University of Waterloo Waterloo ONT Canada Architecture and Networking Group (SAN) in Department of Mathematics and Computer Science Eindhovan University of Technology Eindhoven Netherlands

In distributed diagnosis it may be useful to achieve local consistency among local estimates. For that purpose the Computational Procedure for Local Consistency (CPLC) was proposed to achieve the supremal local support, which represents one type of local consistency. It has been shown that if CPLC terminates then the result is in fact the supremal local support. However, in this paper it is shown that, even if all initial estimates are regular languages, the termination of CPLC is undecidable. Moreover, these difficulties are not confined to this specific procedure: it is undecidable whether the supremal local support corresponding to an arbitrary collection of regular initial languages is componentwise empty; consequently, the supremal local support is effectively uncomputable.

关键词： Belief propagation Fault diagnosis Scalability Computational complexity Discrete event systems Formal languages Councils computer architecture Storage area networks Mathematics

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Simulation-based verification method for SoC bus system

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Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of computer-Aided Design and computer Graphics 2005年第10期17卷 2220-2226页

作者： Yue, Huawei Xu, Yongjun Zhang, Zhimin Yi, Bo Department of Physics University of Science and Technology of China Hefei 230026 China Computer Architecture Laboratory Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China Information Network Laboratory Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China

We propose a simulation-based method in the verification of SoC bus system. By the method, constrained-random vector is used to make simulation first;then a coverage analysis is made in the simulation process until a certain coverage statistics is obtained. Finally, the test vector is manually generated. We use this method to verify a SoC system and get a satisfactory result by reducing the time of simulation effectively.

关键词： Bus system verification Coverage-analysis System on a chip

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High performance stereo computation architecture

High performance stereo computation architecture

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International Conference on Field Programmable Logic and Applications

作者： J. Diaz E. Ros S. Mota E.M. Ortigosa B. del Pino Department of Computer Architecture and Technology E.T.S.I. Informática University de Granada Granada Spain

A simple and fast technique for depth estimation, based on phase measurement has been adopted for the implementation of a real-time stereo system with subpixel resolution on a FPGA device. The technique avoids the attendant problem of phase warping. The designed system takes full advantage of the inherent processing parallelism of FPGA devices to achieve a computation speed of 65 Megapixels per second that can be arranged with a customized frame grabber module to process 52 frames per second of 1280 /spl times/ 960 pixel resolution. The achieved processing speed is higher than existing approaches. This allows the system to extract real-time disparity values for very high resolution images or use several cameras to improve the system accuracy.

关键词： High performance computing computer architecture Real time systems Field programmable gate arrays Phase estimation Phase measurement Parallel processing Concurrent computing Image resolution Cameras

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Enhancing DNS security using the SSL trust infrastructure

Enhancing DNS security using the SSL trust infrastructure

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Workshop on Object-Oriented Real-Time Dependable Systems (WORDS)

作者： C. Fetzer G. Pfeifer T. Jim Department of Computer Science Institute for System Architecture Dresden University of Technology Dresden Germany AT and T Research Laboratories Florham Park NJ USA

The main functionality of the domain name system (DNS) is to translate symbolic names into IP addresses. Due to the criticality of DNS for the proper functioning of the Internet, many improvements have been proposed for DNS in terms of security and dependability. However, the current secure DNS (DNSSEC) standard has still several problems that need further consideration. For example, online updates and denial of service attacks are not sufficiently addressed. These problems are serious obstacles that might prevent DNSSEC from replacing the traditional DNS. In this paper we discuss several of these technical and economic problems. To address these issues, we propose a simple extension to the existing DNS. It is SSL based and individual domains can decide independently of each other if and when to adopt the extensions. We show how to implement these extensions with the help of a simple proxy DNS server.

关键词： Domain Name System computer crime Web server Data security computer science computer architecture Web and internet services Standards development Large-scale systems Delay

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New algorithm for mining frequent itemsets in sparse database

New algorithm for mining frequent itemsets in sparse databas...

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International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Fei-yue Ye Jian-dong Wang Bi-lin Shao College of Information Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing China Department of Computer Science and Technology Jiangsu Teachers College of Technology Changzhou China College of Management Xi''an University of Architecture and Technology Xi'an China

This paper presents novel algorithm for mining frequent itemsets in sparse database, compared with existing algorithm our algorithm has visible advantage. With this algorithm, the scans is less in transaction database, only one time in little and middle transaction database, and not more than two times in large database. In the algorithm, when the transaction database is scanned, the transaction items are saved in unit triplet, and the count of every transaction item is saved in 1-dimension array so that the frequent itemsets are generated in memory. So I/O spending is reduced greatly. The experimental results show that our algorithm is very promising.

关键词： Data mining Itemsets Transaction databases Space technology Association rules Information science computer science technology management computer architecture Electronic mail

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A wavelet based distributed ID model

A wavelet based distributed ID model

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IEEE International Conference on Services Computing (SCC)

作者： Lan Liu Zhitang Li Yong Xu Chenggang Mei Xiaoling Tan Department of Computer Architecture Huangzhong University of Science and Technology Wuhan Hubei China Department of Electronic Information Guangdong Polytechnic Normal University Guangzhou Guangdong China Department of Computer Science South China University of Technology Guangzhou Guangdong China Department of Electronic Engineering Chongqing Three Gorges University Chongqing China

This paper develops a wavelet based distributed ID model approach to analyses network traffic in detail. We adopt wavelet technique to analyze and model ID system to find the attack behavior in network. Our model can post attack characteristic more clearly and, by way of improve the veracity, we compare corresponding network node signals of wavelet decomposition. We simulate attacks and the model can detect attack more precisely than the previous model does.

关键词： Wavelet analysis Frequency synthesizers Telecommunication traffic Traffic control Signal analysis Wavelet coefficients Power system modeling Signal synthesis Prototypes Performance analysis

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Parallel and multi-objective EDAs to create multivariate calibration models for quantitative chemical applications

Parallel and multi-objective EDAs to create multivariate cal...

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International Conference on Parallel Processing Workshops (ICPPW)

作者： A. Mendiburu J. Miguel-Alonso J.A. Lozano M. Ostra C. Ubide Department of Computer Architecture and Technology University of Basque Country (UPV-EHU) San Sabastian Gipuzkoa Spain Department of Computer Sciences and Artificial Intelligence University of Basque Country (UPV-EHU) San Sabastian Gipuzkoa Spain Department of Applied Chemistry University of Basque Country (UPV-EHU) San Sabastian Gipuzkoa Spain

This paper describes the application of several data mining approaches to solve a calibration problem in a quantitative chemistry environment. Experimental data obtained from reactions which involve known concentrations of two or more components are used to calibrate a model that, later, will be used to predict the (unknown) concentrations of those components in a new reaction. This problem can be seen as a selection + prediction one, where the goal is to obtain good values for the variables to predict while minimizing the number of the input variables needed, taking a small subset of really significant ones. Initial approaches to the problem were principal components analysis and filtering. Then we used methods to make smarter reductions of variables, by means of parallel estimation of distribution algorithms (EDAs) to choose collections of variables that yield models with less average prediction errors. A final step was to use multiobjective parallel EDAs, in order to present a set of optimal solutions instead of a single solution.

关键词： Electronic design automation and methodology Calibration Chemicals Predictive models Data mining Chemistry Input variables Principal component analysis Filtering Yield estimation

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Scalable selective re-execution for EDGE architectures

Scalable selective re-execution for EDGE architectures

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作者： Desikan, Rajagopalan Sethumadhavan, Simha Burger, Doug Keckler, Stephen W. Computer Architecture and Technology Laboratory Department of Computer Sciences University of Texas Austin Computer Architecture and Technology Laboratory Department of Electrical and Computer Engineering University of Texas Austin

Pipeline flushes are becoming increasingly expensive in modern microprocessors with large instruction windows and deep pipelines. Selective re-execution is a technique that can reduce the penalty of mis-speculations by re-executing only instructions affected by the mis-speculation, instead of all instructions. In this paper we introduce a new selective re-execution mechanism that exploits the properties of a dataflow-like Explicit Data Graph Execution (EDGE) architecture to support efficient mis-speculation recovery, while scaling to window sizes of thousands of instructions with high performance. This distributed selective re-execution (DSRE) protocol permits multiple speculative waves of computation to be traversing a dataflow graph simultaneously, with a commit wave propagating behind them to ensure correct execution. We evaluate one application of this protocol to provide efficient recovery for load-store dependence speculation. Unlike traditional dataflow architectures which resorted to single-assignment memory semantics, the DSRE protocol combines dataflow execution with speculation to enable high performance and conventional sequential memory semantics. Our experiments show that the DSRE protocol results in an average 17% speedup over the best dependence predictor proposed to date, and obtains 82% of the performance possible with a perfect oracle directing the issue of loads. Copyright 2004 ACM.

关键词： Pipeline processing systems

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