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检索条件"任意字段=Proceedings of the 1997 Conference on Java in Science and Engineering Simulation"

共 687 条记录，以下是281-290 订阅

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Effects of analog multiplier offsets on on-chip learning

Effects of analog multiplier offsets on on-chip learning

引用

1997 IEEE International conference on Neural Networks (ICNN 97)

作者： Choi, YK Ahn, KH Lee, SY Department of Electrical Engineering Korea Advanced Institute of Science and Technology Taejon 305-701 373-1 Kusong-Dong Yusong-Gu South Korea

ISBN: (纸本)0780341236

Offsets inherent in analog circuits have been big obstacle in analog implementations of backpropagation algorithm. In this article the effects of analog multiplier offsets on on-chip learning are systematically analyzed. Offsets in a multiplier are mathematically modeled and incoorporated into backpropagation learning equations. The deformed equations are investigated to show how the offsets degrade learning performance and under which conditions the neuron's output fails to converge. simulation results agree well with analytic calculations.

关键词： Multiplying circuits

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Software interoperability: Principles and practice 97

Software interoperability: Principles and practice

引用

19th International conference on Software engineering (ICSE 97) - Pulling Together

作者： Wileden, JC Kaplan, A Computer Science Department University of Massachusetts Amherst MA Department of Computer Science Flinders University Adelaide SA 5001 Australia

ISBN: (纸本)0897919149

This half-day tutorial is intended to provide attendees a solid understanding of software interoperability problems and various proposed solutions to those problems. It is aimed at an intermediate level audience. It uses running examples to illustrate the use of rigorous foundations, specific approaches to interoperability and the assessment of specific approaches. Participants should expect to gain a generally applicable foundation for assessing both problems and approaches, detailed understanding of several specific approaches, and an ability to understand and critically evaluate new and different interoperability problems and approaches in the future.

关键词： interoperability CORBA OLE polylingual C++ java

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VHDL extensions for complex transmission line simulation

VHDL extensions for complex transmission line simulation

引用

European Design and Test conference - ED and TC 97

作者： Walker, P Ghosh, S Division of Engineering Brown University Providence 02906 RI United States Computer Science Dept. Arizona State University Tempe 85287 AZ United States

ISBN: (纸本)0818677864

This paper proposes extensions to the VHDL grammar and defines new semantics in the language to model the timing behavior of high frequency buses and clock lines with multiple, distinct taps in a VHDL description. The proposed language constructs utilize transmission line analysis to model the timing behavior but avoids the continuous time simulation by using line-events.

关键词： Computer hardware description languages

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Off line Arabic character recognition - A survey

Off line Arabic character recognition - A survey

引用

4th International conference on Document Analysis and Recognition (ICDAR 97)

作者： Amin, A School of Computer Science and Engineering University of New South Wales Sydney NSW Australia

ISBN: (纸本)0818678984;0818678992

Machine simulation of human reading has been the subject of intensive research for almost three decades. A large number of research papers and reports have already been published on Latin, Chinese and Japanese characters. However, little work has been conducted on the automatic recognition of Arabic characters because of the complexity of printed and handwritten text, and this problem is still an open research field. The main objective of this paper is to present the state of Arabic character recognition research throughout the last two decades.

关键词： Character recognition Writing Optical character recognition software Humans Application software Image recognition Optical noise Computer science Australia Computational modeling

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Nonlinear optical, processes in the GaAs-GaP planar gradient waveguides: Computer simulation

Nonlinear optical, processes in the GaAs-GaP planar gradient...

引用

conference on Material science and Material Properties for Infrared Optoelectronics

作者： Voevodin, VG Leontieva, OV Siberian Physical-Technical Institute (Russia)

ISBN: (纸本)0819426091

The software representing a complex of tools for simulation, optimization, and characterization of planar gradient waveguides is developed. Up-conversion of the CO2-laser IR signal under semiconductor laser pumping in nonlinear optical planar waveguides based on solid solutions GaAs in GaP is simulated. Parameters of waveguide composition (refraction index) profiles with the various forms are optimized.

关键词： nonlinear waveguide parametric up-conversion infrared calculation simulation GaAs

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Concurrent simulation for ordinal comparison

Concurrent simulation for ordinal comparison

引用

conference on Enabling Technology for simulation science

作者： Dai, LY Washington Univ. (United States)

ISBN: (纸本)0819424986

Recent research has demonstrated that ordinal comparison, i.e., comparing relative orders of performance measures of different designs, is efficient in the comparison and selection of designs for discrete event dynamic systems. This paper is concerned with comparison and selection in concurrent simulation where a large number of sample paths under different designs are generated efficiently. Particularly, effect of correlation among simulation processes on the convergence of ordinal comparison is investigated. By using a concept of indicator process, bounds on the rate of convergence of ordinal comparison are obtained. Such bounds imply that perturbation analysis, a powerful technique for performance analysis of discrete event dynamic systems, can be advantageous for ordinal comparison. simulation examples show that appropriate correlation can significantly increase the convergence of ordinal comparison. Furthermore, it is shown that positive quadrant dependence provides guaranteed acceleration of the convergence of ordinal comparison compared with independent simulations.

关键词： concurrent simulation discrete event dynamic systems large deviation principle common random numbers quadrant dependence

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New directions towards real-time simulation

New directions towards real-time simulation

引用

conference on Enabling Technology for simulation science

作者： Cassandras, CG Gong, WB Dept. of Manufacturing Engineering Boston University Boston MA 02215 United States

ISBN: (纸本)0819424986

simulation of large complex systems for the purpose of evaluating performance and exploring alternatives is a computationally slow process, currently still out of the domain of real-time applications. This paper overviews advances in three directions aimed at overcoming this limitation. First, based on developments in the theory of discrete event systems, Concurrent simulation enables the extraction of information from a single simulation that would otherwise require multiple repeated simulations. This effectively provides simulation speedups of possibly orders of magnitude. A second direction attempts to use simulation for the purpose of obtaining a ''metamodel'' of the actual system, i.e., an approximate ''surrogate'' model which is computationally very fast, yet accurate. We will specifically discuss the use of Neural Networks as metamodeling devices which may be trained through simulation. Finally, Hierarchical simulation provides yet another means for speedup, a major challenge being the preservation of fidelity between hierarchical levels. In practice, using the statistical average of a high resolution level simulator output as the input for a lower resolution level causes significant loss of stochastic fidelity. We will present an approach in which we cluster the high resolution simulation output into ''path bundles'' as the input for the lower resolution level. The paper includes applications of these new directions to areas such as combat simulation and design of C3I systems.

关键词： concurrent simulation hierarchical simulation metamodeling neural networks discrete event systems

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Metric integration architecture for product development

Metric integration architecture for product development

引用

conference on Enabling Technology for simulation science

作者： Sieger, DB Univ. of Illinois/Chicago (United States)

ISBN: (纸本)0819424986

Present-day product development endeavors utilize the concurrent engineering philosophy as a logical means far incorporating a variety of viewpoints into the design of products. Since this approach provides no explicit procedural provisions, it is necessary to establish at least a mental coupling with a known design process model. The central feature of all such models is the management and transformation of information. While these models assist in structuring the design process, characterizing the basic flow of operations that are involved, they provide no guidance facilities. The significance of this feature, and the role it plays in the time required to develop products, is increasing in importance due to the inherent process dynamics, system/component complexities, and competitive forces, The methodology presented in this paper involves the use of a hierarchical system structure, discrete event system specification (DEVS), and multidimensional state variable based metrics. This approach is unique in its capability to quantify designer's actions throughout product development, provide recommendations about subsequent activity selection, and coordinate distributed activities of designers and/or design teams across all design stages. Conceptual design tool implementation results are used to demonstrate the utility of this technique in improving the incremental decision making process.

关键词： simulation concurrent engineering state variable based metrics product development

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The role of simulation software in an ideal learning environment

The role of simulation software in an ideal learning environ...

引用

ASME 1997 Design engineering Technical conferences, DETC 1997

作者： Reamon, Derek T. Sheppard, Sheri D Center for Design Research Department of Mechanical Engineering StanfordCA94305-2232 United States

ISBN: (纸本)9780791880456

For years, computers have promised to revolutionize education. Educators crave and skeptics demand justification for the large outlay of resources required to introduce information technology into the curriculum. engineering educators have drawn upon the work of education theorists, computer scientists and communication experts to explore the effectiveness of this promising technology in their curricula. This paper analyzes three pairs of students using various solution techniques to solve a mechanical engineering design problem. We will focus on the use of a computer-based simulation tool and its effect on the students' process of solving the problem. We will use two learning theories to explore the learning environment and draw conclusions about the effectiveness of the computer simulation for teaching engineering. © 1997 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Students

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Short wavelength SASE at Duke using the PALADIN wiggler

Short wavelength SASE at Duke using the PALADIN wiggler

引用

conference on Free-Electron Laser Challenges

作者： OShea, PG Neuman, CP Madey, JMJ Freund, HP Duke Univ. (United States) Science Applications International Corp. (United States)

ISBN: (纸本)0819423998

We consider linac driven SASE (Stimulated Amplification of Spontaneous Emission) using the Duke linac and the PALADIN wiggler. SASE design studies using this equipment are described based on the non- wiggler-averaged FEL simulation code MEDUSA. We have identified a new Collective Compton Regime in which AC space-charge is unimportant but the DC self-fields of the beam are important.

关键词： free-electron laser SASE simulation

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