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IEEE International Conference on Electronics, Circuits and systems (ICECS)

作者： N. Nedovic M. Aleksic V.G. Oklobdzija Department of Electrical and Computer Engineering Advanced Computer System Design Laboratory University of California Davis CA USA

Conditional capture and conditional precharge techniques for high-performance flip-flops are reviewed in terms of power and delay. It is found that application of conditional techniques can improve energy-delay product for up to 14% for 50% input activity and save more than 50% in power consumption for quiet input. This property makes conditional methods suitable for high-performance VLSI systems.

关键词： Energy consumption Flip-flops Clocks Delay Very large scale integration Sampling methods Power engineering computing Laboratories Application software Cooling

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An Effective Method for Chinese Grammar Rule Learning

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International Journal of computer Processing of Languages 2001年第4期14卷 361-374页

作者： CHUNFA YUAN GANG CHEN K. F. WONG WENJIE LI State Key Laboratory of Intelligent Technology and System Department of Computer Science & Technology Tsinghua University Beijing 100084 China Department of System Engineering & Engineering Management The Chinese University of Hong Kong China

A new method of Chinese grammar rules learning is put forward in this paper. The key point of this method is to use part-of-speech (POS), semantic and contextual information together in learning and expressing Chinese grammar rules. In this way, not only Context Free Grammar (CFG) rules can be learnt, but also the ambiguous structures in POS can be identified automatically. Furthermore, non-ambiguous semantic rules and forbidden rules can be produced from ambiguous rules by using semantic and contextual information. Experimental results demonstrate that the complexity of Chinese parsing is greatly reduced using the different rules learnt by our method.

关键词： Chinese Parsing Semantic Rules Forbidden Rules Chinese Semantic Associated Net Chinese Grammar Rules

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512-channel vertical-cavity surface-emitting laser based free-space optical link: results

512-channel vertical-cavity surface-emitting laser based fre...

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Optics in Computing, OC 2001

作者： Châteauneuf, M. Venditti, M. Laprise, E. Faucher, J. Razavi, K. Thomas-Dupuis, F. Kirk, A.G. Plant, D.V. Yamamoto, T. Trezza, J.A. Luo, W. Dept. of Electrical and Computer Engineering McGill University Montreal Canada NTT Optical Network System Laboratory Kanagawa Japan Sanders Lockheed Martin NashuaNH United States Emcore AlbuquerqueNM United States

A vertical-cavity surface-emitting laser (VCSEL) based bi-directional free-space optical interconnect has been implemented to interconnect two PCBs. A total of 512 clustered channels are propagated over a distance of ... 详细信息

ISBN: (纸本)1557526575

关键词： Surface emitting lasers

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Comparison of three databases with a decision tree approach in the medical field of acute appendicitis

Comparison of three databases with a decision tree approach ...

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10th World Congress on Medical Informatics, MEDINFO 2001

作者： Zorman, Milan Eich, Hans-Peter Kokol, Peter Ohmann, Christian Laboratory for System Design Faculty of Electrical Engineering and Computer Science University of Maribor Smeatnova 17 SI-2000 Maribor Slovenia Theoretical Surgery Unit Dept. of General and Trauma Surgery Heinrich-Heine University Düsseldorf Germany

ISBN: (纸本)1586031945

Decision trees have been successfully used for years in many medical decision making applications. Transparent representation of acquired knowledge and fast algorithms made decision trees one of the most often used symbolic machine learning approaches. This paper concentrates on the problem of separating acute appendicitis, which is a special problem of acute abdominal pain from other diseases that cause acute abdominal pain by use of an decision tree approach. Early and accurate diagnosing of acute appendicitis is still a difficult and challenging problem in everyday clinical routine. An important factor in the error rate is poor discrimination between acute appendicitis and other diseases that cause acute abdominal pain. This error rate is still high, despite considerable improvements in history-taking and clinical examination, computer-aided decision-support and special investigation, such as ultrasound. We investigated three different large databases with cases of acute abdominal pain to complete this task as successful as possible. The results show that the size of the database does not necessary directly influence the success of the decision tree built on it. Surprisingly we got the best results from the decision trees built on the smallest and the biggest database, where the database with medium size (relative to the other two) was not so successful. Despite that we were able to produce decision tree classifiers that were capable of producing correct decisions on test data sets with accuracy up to 84%, sensitivity to acute appendicitis up to 90%, and specificity up to 80% on the same test set. © 2001 IMIA. All right reserved.

关键词： Decision trees

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Ethernet Wrapper: extension of the TCP Wrapper

Ethernet Wrapper: extension of the TCP Wrapper

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International Conference on Parallel and Distributed systems (ICPADS)

作者： MoonSang Kwon Jiman Hong Yookun Cho System Software Research Laboratory Department of Computer Science and Engineering Seoul National University Seoul South Korea

ISBN: (纸本)0769511538

One of the popular network security programs supporting host access control is the 'TCP Wrapper' (Venema, 1992). TCP Wrapper is a software-only system and many computers connected to the Internet are using it. However, TCP Wrapper does 'IP address-based' access control. The IP address is not such a reliable source when authenticating a host. We point out two possible attacks against the TCP Wrapper, propose a new way to prevent them, and describe the prototype implementation, Ethernet Wrapper. By adding an Ethernet address check, we augmented the TCP Wrapper. The test results showed that Ethernet Wrapper can prevent such attacks effectively.

关键词： Ethernet networks TCPIP Authentication Access control computer security Prototypes system software computer science National security Internet

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Server of quality system for video on demand over ATM

Server of quality system for video on demand over ATM

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IEEE International Conference on ATM

作者： R.M. Silveira W.V. Ruggiero LARC-Laboratory of Computer Architecture and Networks PCS-Department of Computer and Digital System Engineering EPUSP Polytechnic School University of Sao Paulo Sao Paulo Brazil

ISBN: (纸本)0780370937

Considering video transmission over an ATM network for a video on demand system, we propose a server of quality (SoQ) that has the main function of fitting the video transmission rate to the available network bandwidth. The SoQ uses a "backpropagation" neural network to fit the MPEG quantization coefficients in a nonlinear way. Here are shown the SoQ specification and the results obtained from its main module implementation.

关键词： Video on demand Asynchronous transfer mode Bit rate Network servers Bandwidth Neural networks Quality of service Quantization Telecommunication traffic Backpropagation

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Digital hardware organization course for SoC program

Digital hardware organization course for SoC program

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IEEE International Conference on Microelectronic systems Education

作者： P. Ellervee H. Tenhunen Department of Computer Engineering Tallinn Technical University Estonia Electronic System Design Laboratory Royal Institute of Technology Stockholm Sweden

ISBN: (纸本)0769511562

In this paper we describe our approach towards the second level digital techniques course suited for system-on-Chip (SoC) oriented curriculum. Due to enhanced utilization of synthesis techniques and higher level block-oriented design, new requirements for digital hardware design are set up. Our working hypothesis is that the course focus needs to be in a systematic working set based on general transformation and refinements are more important than a presentation of detailed and specific target solutions. Thus the student should master the methodology and understand the underlying principles, which will enable him or her, to utilize more effectively the advanced VHDL synthesis techniques, which are covered in the follow-up course.

关键词： Hardware Electronic mail system-on-a-chip Integrated circuit technology Logic Laboratories Design engineering Integrated circuit synthesis Microelectronics Digital systems

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IDENTIFYING OVERLAPPED OBJECTS FOR VIDEO INDEXING AND MODELING IN MULTIMEDIA DATABASE systemS

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International Journal on Artificial Intelligence Tools 2001年第4期10卷 715-734页

作者： SHU-CHING CHEN MEI-LING SHYU CHENGCUI ZHANG R. L. KASHYAP Distributed Multimedia Information System Laboratory School of Computer Science Florida International University Miami FL 33199 USA Department of Electrical and Computer Engineering University of Miami Coral Gables FL 33124 USA School of Electrical and Computer Engineering Purdue University West Lafayette IN 47907 USA

The identification of the overlapped objects is a great challenge in object tracking and video data indexing. For this purpose, a backtrack-chain-updation split algorithm is proposed to assist an unsupervised video segmentation method called the "simultaneous partition and class parameter estimation" (SPCPE) algorithm to identify the overlapped objects in the video sequence. The backtrack-chain-updation split algorithm can identify the split segment (object) and use the information in the current frame to update the previous frames in a backtrack-chain manner. The split algorithm provides more accurate temporal and spatial information of the semantic objects so that the semantic objects can be indexed and modeled by multimedia input strings and the multimedia augmented transition network (MATN) model. The MATN model is based on the ATN model that has been used in artificial intelligence (AI) areas for natural language understanding systems, and its inputs are modeled by the multimedia input strings. In this paper, we will show that the SPCPE algorithm together with the backtrack-chain-updation split algorithm can significantly enhance the efficiency of spatio-temporal video indexing by improving the accuracy of multimedia database queries related to semantic objects.

关键词： Multimedia Augmented Transition Network (MATN) Multimedia Input String Backtrack-Chain-Updation Split Algorithm Multimedia Database systems

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Electrical characteristics of single and coupled stripline on meshed ground plane in high-speed package

Electrical characteristics of single and coupled stripline o...

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International Symposium on Electronic Materials and Packaging

作者： Heeseok Lee Joungho Kim Terahertz Media and System Laboratory Division of Electrical Engineering Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

ISBN: (纸本)0780371577

In high-speed packages, the high-frequency characteristic of the interconnection structure becomes increasingly important. In this paper, the propagation characteristics of the stripline placed on the meshed ground plane (SMEP) are determined. The effective dielectric constant and the characteristic impedance of the single SMEP are determined by utilizing the full-wave analysis. For the longitudinally periodic structure modeling of SMEP, the finite-difference time-domain method based on Floquet's theorem is used. The slow wave effect and the high impedance characteristic are observed. In addition to the single SMEP analysis, the propagation and coupling property of the coupled SMEP is also presented, which is very important in the cross-talk modeling.

关键词： Electric variables Stripline Packaging Integrated circuit interconnections Microprocessors Impedance Voltage Power transmission lines Crosstalk Power system interconnection

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Testing IP cores with pseudo exhaustive test sets

Testing IP cores with pseudo exhaustive test sets

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International Conference on ASIC

作者： R. Tang P.F. Si W.K. Huang F. Lombardi National ASIC and System Key Laboratory Fudan University Shanghai China Department of Electrical and Computer Engineering Northeastern University Boston USA

Testing core-based SOCs poses a big challenge to test engineers. To test core-based SOCs, an important step is to get test sets for testing cores. Soft cores are usually provided with hardware description languages such as VHDL and Verilog. It is much more difficult to generate test sets at higher level than at logic level. Recently, researchers have made efforts to develop test pattern generation algorithms and tools at RTL level. Function test is basically used for the test generation at high level. Exhaustive function test can detect any functional faults including multiple faults and the test pattern generation procedure is simple. However, exhaustive function test is unrealistic for practical application as too many test patterns are required. The alternative way is to use pseudo-exhaustive function test, which can reduce the number of patterns while keep high fault coverage. Pseudo-exhaustive testing was first introduced by E.J. Macluskey, but it is limited to logic level. In this paper, we propose a method to generate pseudo-exhaustive test sets at function level. The proposed method can be used to generate test sets for IP cores, specially, for soft cores.

关键词： Circuit testing Logic testing Test pattern generators Circuit faults system testing Hardware design languages Automatic test pattern generation Sequential analysis Fault detection Automatic logic units

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