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Linear Phase Shift Response with High Dynamic Range for Holographic Recording in As₂S₃

Optical Review 1994年第1期1卷 36-38页

作者： Dietrich, Christoph H. Noehte, Steffen Männer, Reinhard Chair of Computer Science V University of Mannheim Mannheim Germany Physical Institute University of Heidelberg Heidelberg Germany

Amorphous As2S3 films are real-time photographic materials for phase holograms. This work focuses on the phase shift in As2S3 films as a function of the exposure. A method for measuring the phase shift response and th... 详细信息

Amorphous As₂S₃ films are real-time photographic materials for phase holograms. This work focuses on the phase shift in As₂S₃ films as a function of the exposure. A method for measuring the phase shift response and the exposure simultaneously is presented. A relative displacement determination of interferometric patterns allows precise measurements insensitive to changes of experimental conditions. The phase shift dependence on the intensity of the writing beam is evaluated for two different films. As a result, a linear phase shift response is obtained with a dynamic range of nearly π. It is independent of the intensity over four orders of magnitude. The results are proofed by diffraction efficiency measurements. © 1994, Japan Society of Applied Physics. All rights reserved.

关键词： As2S3 holographic recording materials interferometric phase shift measuring linear phase recording

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ISDN LOOP EXTENSION USING A MID-SPAN AMPLIFIER

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INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 1995年第3期8卷 219-224页

作者： ERKER, GJ DODDS, DE KRZYMIEN, WA David E. Dodds was born in Saskatoon Canada in 1945. He received the B. Eng. and MSc. degrees from the University of Saskatchewan in 1966 and 1968 respectively. He worked with Bell Northern Research (Ottawa) on PBX design in 1969 1972 and 1978. Since 1969 he has been with the University of Saskatchewan where he is currently Professor of Electrical Engineering. He teaches courses in electronics and communications and also presents short courses on the fundamentals of telephony. Current research interests are in data transmission signal processing architecture and frame synchronization for PCM and spread spectrum systems. He has been granted five patents relating to commercial products in delta-modulation telephone line interfacing and computer data transmission. In 1986 he was on sabbatical leave at BNR Inc. and worked with an ANSI committee on the standardization of FDDI-II a combined voice and data system. Mr. Dodds is a Registered Consulting Engineer in Saskatchewan. Witold A. Krzyden received his MSc. (Eng.) and Ph.D. degrees (both in Electrical Engineering) in 1970 and 1978 respectively from the Poznan Technical University in Poznan Poland. He was awarded the Minister's of Science and Technology Prize of Excellence for his Ph.D. thesis. From 1970 to 1978 he was a Research Engineer and Teaching Assistant and then from 1978 to 1980 an Assistant Professor of Electrical Engineering at the Poznan Technical University. In 1980 he won a Dutch Government Research Fellowship at the Twente University of Technology in Enschede the Netherlands for the year of 1980/1981. In the following year of 1981/82 he was a Research Assistant Professor there. From 1982 to 1986 he was an Assistant Professor of Electrical Engineering at Lakehead University in Thunder Bay Ontario Canada. In 1986 he joined the Univeristy of Alberta and Alberta Telecommunications Research Centre (now Telecommunications Research Laboratories or TRLabs) as an Associate Professor of Electrical Engineering. Currently he is a Professor of E

The 5.5 km range of the basic rate ISDN loop has been extended by using a negative impedance amplifier and by using a 2 wire/4 wire (2w/4w) amplifier. The negative impedance amplifier extends the range of the loop by 1.0 km, whereas the 2w/4w amplifier extends the range by 1.5 km at the expense of increased complexity. As part of the amplifer design, a resistor/capacitor network has been developed which closely matches the characteristic impedance of telephone cable. Error rate tests have been conducted using various lengths of cable and an operating ISDN line.

关键词： ISDN PHYSICAL LAYER BASIC RATE LOOP RANGE EXTENSION

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Comments on "Analysis of self-stabilizing clock synchronization by means of stochastic Petri nets"

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IEEE Transactions on computers 1994年第12期43卷 1453-1456页

作者： G. Ciardo C. Lindemann Department of Computer Science College of William and Mary Williamsburg VA USA GMD Institute for Computer Architecture and Software Technology (GMD-FIRST) Technische Universitat Berlin Berlin Germany

We point out some errors in the combinatorial approach for the steady-state analysis of a deterministic and stochastic Petri net (DSPN) presented by M. Lu, D. Zhang, and T. Murata (1990). However, the methodology for analyzing the self-stability of fault-tolerant clock synchronisation (FCS) systems introduced in that paper is applicable for FCS systems with many clocking modules, even if the combinatorial approach is not valid. This is due to the progress in improving the efficiency of the DSPN solution algorithm made in recent years. We show that the explicit computation of the steady-state solution of the DSPN can be performed with reasonable computational effort on a modern workstation by the software package DSPNexpress.< >

关键词： Clocks Synchronization Stochastic processes Petri nets Electromagnetic compatibility Stochastic systems Steady-state Fault tolerant systems Probability distribution Performance analysis

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A minimal window system architecture for distributed environment

A minimal window system architecture for distributed environ...

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20th EUROMICRO Conference on System architecture and Integration, EUROMICRO 1994

作者： Yoon, Jinsoo Hoffner, Yigal Chon, Kilnam Dept. of Computer Science Korea Advanced Institute of Science and Technology 371-1 Kuseong-Dong Yuseong-Ku Daejeon 305-701 Korea Republic of Architecture Project Management Ltd. Poseidon House Cambridge CB3 ORD United Kingdom

ISBN: (纸本)0818664304

In this paper, we assert that window system plays a fundamental role in supporting multiple interaction channels distributed over a finite number of I/O devices. For historical as well as technical reasons, window systems usually deal with the issues which concern distribution of window system components, heterogeneity, user interface, multimedia, and distributed application support. We propose a minimal window system architecture which allows separate treatment of these issues. The minimal window system architecture serves as a basis for discussing the influence of these issues on each other. Also in the viewpoint of the transparency facilities inherent in a distributed system, a window system model based on the minimal window system is proposed for the distributed environment. © 1994 IEEE.

关键词： User interfaces

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Nonnumeric search results on the EM-4 distributed-memory multiprocessor 94

Nonnumeric search results on the EM-4 distributed-memory mul...

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Supercomputing Conference

作者： A. Sohn M. Sato S. Sakai Y. Kodama Y. Yamaguchi Computer and Information Science Department New Jersey Institute of Technology Newark NJ USA Computer Architecture Section Electro Technical Laboratory Tsukuba Ibaraki Japan

ISBN: (纸本)9780818666056

Numeric scientific problems have been the main focus of supercomputing as their numerous implementations on various multiprocessors indicate. Nonnumeric problems on the other hand have received very little attention for parallel implementation due to their irregular behaviors and a large amount of resource usage. This report presents our experiences implementing difficult nonnumeric problems on the EM-4 multiprocessor, believing that supercomputers should also be able to effectively execute nonnumeric problems if they are to be considered 'supercomputers'. We selected two typical search problems, the Eight-Puzzle and the Tower-of-Hanoi. Two parallel search techniques we used to implement the search problems, unidirectional and bidirectional heuristic search. A total of eight different programs have been implemented on the EM-4 multiprocessor with realistic problem sizes. Execution results demonstrate that the parallel bidirectional heuristic search can solve the tree depth 20 to 40 of the Eight-Puzzle in an optimal or near optimal number of iterations in less than two seconds, and is highly scalable as it gives over 40-fold speedup for both problems on 80 processors.< >

关键词： Concurrent computing Search problems Supercomputers Artificial intelligence Runtime Information science computer architecture Laboratories Buildings Parallel machines

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A minimal window system architecture for distributed environment

A minimal window system architecture for distributed environ...

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EUROMICRO Conference

作者： Jinsoo Yoon Yigal Hoffner Kilnam Chon Department of Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea Architecture and Project Management Limited Cambridge UK

ISBN: (纸本)0818664304

In this paper, we assert that window system plays a fundamental role in supporting multiple interaction channels distributed over a finite number of I/O devices. For historical as well as technical reasons, window systems usually deal with the issues which concern distribution of window system components, heterogeneity, user interface, multimedia, and distributed application support. We propose a minimal window system architecture which allows separate treatment of these issues. The minimal window-system architecture serves as a basis for discussing the influence of these issues on each other. Also in the viewpoint of the transparency facilities inherent in a distributed system, a window system model based on the minimal window system is proposed for the distributed environment.< >

关键词： Application software computer architecture User interfaces Distributed computing Multimedia systems Workstations computer science Project management Operating systems computer networks

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Predicting the drape of woven cloth using interacting particles 94

Predicting the drape of woven cloth using interacting partic...

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21st Annual Conference on computer Graphics and Interactive Techniques, SIGGRAPH 1994

作者： Breen, David E. House, Donald H. Wozny, Michael J. European Computer-Industry Research Centre Design Research Center Rensselaer Polytechnic Institute Arabellastrasse 17 MunichD-81925 Germany Visualization Laboratory Texas A and M University Department of Computer Science Williams College College of Architecture College StationTX77843-3137 United States National Institute of Standards and Technology Design Research Center Rensselaer Polytechnic Institute MEL 220/B322 GaithersburgMD20899 United States

ISBN: (纸本)0897916670

We demonstrate a physically-based technique for predicting the drape of a wide variety of woven fabrics. The approach exploits a theoretical model that explicitly represents the microstructure of woven cloth with interacting particles, rather than utilizing a continuum approximation. By testing a cloth sample in a Kawabata fabric testing device, we obtain data that is used to tune the model's energy functions, so that it reproduces the draping behavior of the original material. Photographs, comparing the drape of actual cloth with visualizations of simulation results, show that we are able to reliably model the unique large-scale draping characteristics of distinctly different fabric types. © ACM 1994.

关键词： Weaving

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Linearity and the cnf property in linear fuzzy rule interpolation

Linearity and the cnf property in linear fuzzy rule interpol...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： L.T. Koczy S. Kovacs LIFE Chair of Fuzzy Theory Department of Systems Science Tokyo Institute of Technology Yokohama Japan Computer Centre University of Miskolc Miskolc Hungary

It is an important question if rule interpolation is done whether the theoretical shape of the membership function of the calculated conclusion is exactly or approximately linear between two neighboring /spl alpha/-levels in the breakpoint set, or it has a very different shape. In the latter case, interpolation for only a few (as e.g. 0 and 1) levels is not satisfactory, which fact might increase the computational time necessary for generating the conclusion by a large constant factor. It is also examined if the conclusion has a convex and normal membership function, i.e. whether the calculated infima exceed the calculated suprema of the given /spl alpha/-cut or not.< >

关键词： Linearity Interpolation Shape Equations Fuzzy reasoning Fuzzy set theory Fuzzy systems Cloning Fuzzy control Real time systems

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Parallel bidirectional heuristic search on the EM-4 multiprocessor

Parallel bidirectional heuristic search on the EM-4 multipro...

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International Symposium on Parallel and Distributed Processing (IPDPS)

Solving search problems takes a large amount of computational resources both in terms of execution time and memory usage. This report presents experimental results of Parallel Bidirectional Heuristic Search (PBiHS) on the 80-processor EM-4 multithreaded data-flow multiprocessor. The PBiHS searches from two directions in parallel while search in each direction is also performed in parallel. Important data structures are distributed to all processors to help reduce the execution time of realistic problem sizes down to a few seconds or less. We implement two search problems, the Eight Puzzle and the Tower of Hanoi, and execute on the target multiprocessor. Execution results demonstrate that the Parallel Bidirectional Heuristic Search can solve the tree depth 20-40 of the Eight-Puzzle and the 3-9 disks of the Tower of Hanoi in an optimal or near optimal number of iterations in less than two seconds, is highly scalable as it gives over 40-fold speedup on 80 processors, and yields on the average 10-fold improvement over unidirectional search for the 8-Puzzle while generating a far less number of nodes.< >

关键词： Search problems Poles and towers Artificial intelligence Concurrent computing Data structures Parallel processing Information science computer architecture Laboratories Buildings

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An approach to the evaluation of human resources by using fuzzy set theory

An approach to the evaluation of human resources by using fu...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： A. Cannavacciuolo G. Capaldo A. Ventre A. Volpe G. Zollo Fiat Research Center Torin Italy Napoli Italy Institute of Mathematics Faculty of Architecture University of Naples Federico II Napoli Italy DISA Faculty of Economics University of Trento Italy ODISSEO Department of Computer Science and Systems University of Naples Federico II Napoli Italy

This paper presents a method used to improve the current personnel evaluation procedures in a large company. The method is grounded on the semiotic analysis of stories justifying judgments. Categories and verbal values are represented by using concepts of fuzzy set theory. Particularly, a method is presented to measure the membership value of an individual in a predefined fuzzy category.< >

关键词： Humans Fuzzy set theory Mathematics computer architecture computer science Personnel Particle measurements Guidelines Filters Aggregates

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