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Weighted one-way hash chain and its applications 3

3rd International Workshop on information Security, ISW 2000

作者： Yen, Sung-Ming Zheng, Yuliang Department of Computer Science and Information Engineering National Central University Chung-Li320 Taiwan LINKS - Laboratory for Information and Network Security School of Network Computing Monash University McMahons Road FrankstonVIC3199 Australia

ISBN: (纸本)3540414169

An one-way hash chain generated by the iterative use of a one-way hash function on a secret value has recently been widely employed to develop many practical cryptographic solutions, especially electronic micropayment schemes. In this paper, we propose a new concept called a weighted one-way hash chain. We then proceed to use the new concept to improve in a significant way the performance of micropayment schemes. We also show that the proposed technique is especially useful in implementing micropayment on a resource restrained computing device such as a hand-held computer. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Hand held computers

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Distributed expertise for teaching computer organization & architecture 00

Distributed expertise for teaching computer organization & a...

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Working Group Reports from 5th Annual Conference on Innovation and Technology in computer science Education, ITiCSE-WGR 2000

作者： Cassel, Lillian Boots Kumar, Deepak Bolding, Kevin Davies, Jim Holliday, Mark Impagliazzo, John Pearson, Murray Wolffe, Gregory S. Yurcik, William Department of Computing Sciences Villanova University VillanovaPA United States Department of Mathematics and Computer Science Bryn Mawr College Bryn MawrPA United States Department of Electrical Engineering Seattle Pacific University SeattleWA United States Computing Laboratory University of Oxford Oxford United Kingdom Department of Mathematics and Computer Science Western Carolina University CullowheeNC United States Department of Computer Science Hofstra University HempsteadNY United States Department of Computer Science University of Waikato Hamilton New Zealand Department of Computer Science and Information Systems Grand Valley State University AllendaleMI United States Department of Applied Computer Science Illinois State University NormalIL United States

ISBN: (纸本)9781450373586

This report presents preliminary results from our project on creating distributed expertise for teaching computer organization & architecture course(s) in the undergraduate computer science curriculum. We present the details of an online survey designed to gather information from faculty on the current state of teaching this course. The survey also tries to identify specific areas of need for creating distributed expertise as reported by various faculty. We also present several resources that have been identified that are available for use by faculty teaching the course(s). This report represents a mid-point of an ongoing two-year study. Following a discussion of the currently identified needs, we discuss ways to address them and conclude the report with a plan of action that will follow in the next phase of the project.

关键词： Teaching

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A novel application development environment for large-scale scientific computations 00

A novel application development environment for large-scale ...

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Proceedings of the 14th international conference on Supercomputing

作者： X. Shen W. Liao A. Choudhary G. Memik M. Kandemir S. More G. Thiruvathukal A. Singh Center for Parallel and Distributed Computing Department of Electrical and Computer Engineering Northwestern University Evanston IL Department of Computer Science and Engineering The Pennsylvania State University University Park PA School of Computing Telecommunications and Information Sciences JHPC Laboratory Depaul University

Our results demonstrate that our novel application development environment provides both ease-of-use and high performance for large-scale, I/O-intensive scientific applications.

ISBN: (纸本)9781581132700

Our results demonstrate that our novel application development environment provides both ease-of-use and high performance for large-scale, I/O-intensive scientific applications.

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A SURVEY ON DESIGN RATIONALE: REPRESENTATION, CAPTURE AND RETRIEVAL

A SURVEY ON DESIGN RATIONALE: REPRESENTATION, CAPTURE AND RE...

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ASME 2000 International Design engineering Technical Conferences and computers and information in engineering Conference, IDETC-CIE 2000

作者： Hu, Xiaochun Pang, Jun Pang, Yan Atwood, Michael Sun, Wei Regli, William C. Geometric and Intelligent Computing Laboratory Department of Mathematics and Computer Science Drexel University 3141 Chestnut Street PhiladelphiaPA19104 United States Rapid Product Development Center Department of Mechanical Engineering and Mechanics Drexel University 3141 Chestnut Street PhiladelphiaPA19104 United States College of Information Science and Technology Drexel University 3141 Chestnut Street PhiladelphiaPA19104 United States

ISBN: (纸本)9780791835135

This paper provides a brief survey on recent research in the area of design rationale. The study of Design Rationale spans a number of diverse disciplines, touching on concepts from research communities in Mechanical Design, Software engineering, Artificial Intelligence, Civil engineering and Human-Factors and Human-computer Interaction research. We focus this survey on prototype design rationale systems for these application domains and put forward several major axes along which to describe and classify design rationale systems, including argumentation-based, descriptive, and process-based approaches. Further, we attempt to abstract the place of systems and tools for design rationale capture and retrieval in the context of contemporary knowledge-based engineering and CAD tools. This survey is structured around the fundamental different approaches, their representation schema, their capture methods, and retrieval techniques. A number of recent design rationale systems and representation schemes are presented, including JANUS, COMET, ADD, REMAP, HOS, PHIDIAS, DRIVE, IBIS. We conclude with an assessment of the current state-ofthe-art and a discussion of critical open research issues. Copyright © 2000 by ASME.

关键词： computer aided design

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Preface

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2000年 1803卷 6-6页

作者： Cagnoni, Stefano Poli, Riccardo Li, Yun Smith, George Corne, David Oates, Martin Hart, Emma Lanzi, Pier Luca Boers, Egbert J. W. Paechter, Ben Fogarty, Terence C. University of Parma Department of Computer Engineering Parco delle Scienze 181/a Parma Italy The University of Birmingham School of Computer Science Edgbaston Birmingham United Kingdom University of Glasgow Electronics and Electrical Engineering Rankine Building Glasgow United Kingdom University of East Anglia Department of Information Systems Norwich United Kingdom University of Reading P.O. Box 225 Whiteknights Reading United Kingdom BT Labs at Adastral Park Dept. Complex Systems Laboratory Martlesham Heath Suffolk United Kingdom University of Edinburgh Division of Informatics 80 South Bridge Edinburgh United Kingdom Milan Polytechnic Department of Electronics and Informatics Piazza Leonard0 da Vinci 32 Milan Italy National Aerospace Laboratory NLR Data and Knowledge Systems Dept I.C.T. Division Anthony Fokkerweg 2 Amsterdam Netherlands Napier University School of Computing 219 Colinton Road Edinburgh United Kingdom South Bank University School of Computing Information Systems and Mathematics 103 Borough Road London United Kingdom

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Macroblock type selection for compressed domain down-sampling of MPEG video

Macroblock type selection for compressed domain down-samplin...

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Canadian Conference on Electrical and computer engineering (CCECE)

作者： M.R. Hashemi L. Winger S. Panchanathan School of Information Technology and Engineering (SITE) University of Ottawa Ottawa ONT Canada Visual Computing and Communications Laboratory Department of Computer Science and Engineering Arizona State University USA

Digital video databases in compressed form are becoming widely available. In applications such as video browsing, and picture in picture, for a lower bitrate there is a need to down-sample the video before transmission. The conventional approach to downscale a compressed video sequence is to decompress it at the video server, perform the down-sampling in the pixel domain and recompress it again for efficient delivery. This process is computationally expensive due to the motion estimation process needed during the recompression phase. In the alternative compressed domain based approach the downscaled motion vectors are computed directly from the original ones. We propose a method to improve the process of downscaling in the compressed domain by better selecting the motion prediction type of P and B frame macroblocks. Simulations suggest that the proposed scheme improves the compressed domain down-sampling quality by up to 2.2 dB without any substantial increase in computation.

关键词： Transform coding Video compression Motion estimation Discrete cosine transforms Video sequences Image coding Visual databases Bit rate Image storage information technology

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Compressed domain motion vector resampling for downscaling of MPEG video

Compressed domain motion vector resampling for downscaling o...

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IEEE International Conference on Image Processing

作者： M.R. Hashemi L. Winger S. Panchanathan School of Information Technology and Engineering University of Ottawa Ottawa ONT Canada Visual Computing and Communications Laboratory Department of Computer Science and Engineering Arizona State University Saudi Arabia

Digital video databases in compressed form are becoming widely available. In applications such as video browsing, and picture in picture, for a lower bitrate, there is a need to down-sample the video before transmission. The conventional approach to downscale a compressed video sequence is to decompress it at the video server, perform the down-sampling in the pixel domain and then recompress it for efficient delivery. This process is computationally intensive due to the motion estimation process required during the recompression phase. In the alternative compressed domain approach, the motion vectors of the downscaled video sequence are computed directly from the motion vectors of the original full size stream. In this paper we propose a compressed domain technique that generates a better estimate for the downscaled motion vectors. Simulations suggest that the performance achieved with the proposed method is superior by up to 1 dB to the current compressed domain techniques.

关键词： Transform coding Video compression Video sequences Motion estimation Discrete cosine transforms Image coding Bit rate Image storage information technology Databases

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Structured spatial domain image and data comparison metrics

Structured spatial domain image and data comparison metrics

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IEEE Conference on Visualization

作者： N. Sahasrabudhe J.E. West R. Machiraju M. Janus NSF Engineering Research Center Mississippi State University USA DoD High Performance Computing Center Information Technology Laboratory USAE Waterways Experiment Station USA Department of Computer Science NSF Engineering Research Center Mississippi State University USA Department of AeroSpace Engineering NSF Engineering Research Center Mississippi State University USA

ISBN: (纸本)078035897X

Often, images or datasets have to be compared to facilitate choices of visualization and simulation parameters respectively. Common comparison techniques include side-by-side viewing and juxtaposition, in order to facilitate visual verification of verisimilitude. We propose quantitative techniques which accentuate differences in images and datasets. The comparison is enabled through a collection of partial metrics which, essentially, measure the lack of correlation between the datasets or images being compared. That is, they attempt to expose and measure the extent of the inherent structures in the difference between images or datasets. Besides yielding numerical attributes, the metrics also produce images which can visually highlight differences. Our metrics are simple to compute and operate in the spatial domain. We demonstrate the effectiveness of our metrics through examples for comparing images and datasets.

关键词： Image generation Rendering (computer graphics) Data visualization High performance computing information technology Laboratories computer science Aerospace engineering Data engineering Computational modeling

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Structured spatial domain image and data comparison metrics 99

Structured spatial domain image and data comparison metrics

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Proceedings of the conference on Visualization '99: celebrating ten years

作者： Nivedita Sahasrabudhe John E. West Raghu Machiraju Mark Janus NSF Engineering Research Center Mississippi State University DoD High Performance Computing Center Information Technology Laboratory USAE Waterways Experiment Station and NSF Engineering Research Center Mississippi State University Department of Computer Science NSF Engineering Research Center Mississippi State University Department of Aerospace Engineering NSF Engineering Research Center Mississippi State University

ISBN: (纸本)9780780358973

Often, images or datasets have to be compared, to facilitate choices of visualization and simulation parameters respectively. Common comparison techniques include side-by-side viewing and juxtaposition, in order to facilitate visual verification of verisimilitude. In this paper, we propose quantitative techniques which accentuate differences in images and datasets. The comparison is enabled through a collection of partial metrics which, essentially, measure the lack of correlation between the datasets or images being compared. That is, they attempt to expose and measure the extent of the inherent structures in the difference between images or datasets. Besides yielding numerical attributes, the metrics also produce images, which can visually highlight differences. Our metrics are simple to compute and operate in the spatial domain. We demonstrate the effectiveness of our metrics through examples for comparing images and datasets.

关键词： correlation measure rendering metrics steering

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Strategic directions in simulation research (panel) 99

Strategic directions in simulation research (panel)

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Proceedings of the 31st conference on Winter simulation: Simulation---a bridge to the future - Volume 2

作者： David M. Nicol Osman Balci Richard M. Fujimoto Paul A. Fishwick Pierre L'Ecuyer Roger Smith Ernest H. Page Department of Computer Science 6211 Sudikoff Laboratory Dartmouth College Hanover NH Department of Computer Science Virginia Polytechnical Institute & State University Blacksburg VA College of Computing Georgia Institute of Technology Atlanta GA Department of Computer & Information Science and Engineering University of Florida CSE 301 Gainesville FL Département d'Informatique et de Recherche Opérationelle Université de Montréal C.P. 6128 Succ. Centre-Ville Montréal Québec Canada H3C 3J7 BTG Inc. 3481 Woodley Park Place Oviedo FL The MITRE Corporation 1820 Dolley Madison Boulevard McLean VA

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