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Design Automation Conference

作者： Byunggyu Kwak Eun Sei Park School of Electrical and Computer Engineering Hanyang University Ansan South Korea Samsung Data System Company Limited Seoul South Korea

ISBN: (纸本)0897919645

We present a statistical power estimation method where the estimation time and accuracy can be balanced by assigning smaller errors to the nodes with higher power dissipation and higher errors to the nodes with lower power dissipation. To calculate the error rates for individual nodes, a quadratic programming based problem is formulated which incorporates the distribution data of all individual node switching activities. Also, an iterative statistical power estimation system is presented. Finally, we demonstrate experimental results which show drastic reduction in the number of simulation patterns compared to previous methods.

关键词： CMOS logic circuits Error analysis Circuit simulation Power dissipation Switching circuits Permission Energy consumption Power system reliability Transfer functions Computational modeling

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High-performance mixed-machine heterogeneous computing

High-performance mixed-machine heterogeneous computing

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Euromicro Workshop on Parallel and Distributed Processing

作者： M. Maheswaran T.D. Braun H.J. Siegel Parallel Processing Laboratory School of Electrical and Computer Engineering Purdue University West Lafayette IN USA Purdue University System West Lafayette IN US

The focus of this invited keynote paper (to be presented by H.J. Siegel) is mixed-machine heterogeneous computing, where a suite of different kinds of high-performance machines are interconnected by high-speed links. Such a system can be orchestrated to perform an application whose subtasks have diverse execution requirements. Subtasks are assigned to and executed on the machines that will result in a minimal overall execution time for the task, considering factors including inter-machine communication overhead. A conceptual model of the automatic decomposition of tasks and assignment of subtasks is presented. Examples of static and dynamic approaches to the matching and scheduling of subtasks are summarized. Some open research problems are discussed.

关键词： Concurrent computing Processor scheduling Dynamic scheduling Application software computer architecture Parallel processing Laboratories Indium tin oxide Subcontracting Heuristic algorithms

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DC-to-mm-wave absolute potential measurements inside digital microwave ICs using a micromachined photoconductive sampling probe

DC-to-mm-wave absolute potential measurements inside digital...

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Microwave, MTT-S International Symposium

作者： G. David J.F. Whitaker T.R. Weatherford K. Jobe S. Meyer M. Bustamante W. Goyette S. Thomas K. Elliott Center of Ultrafast Optical Science and Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA Department of Electrical and Computer Engineering Naval Postgraduate School Monterrey CA USA Hughes Space and Communications Company Los Angeles CA USA TRW Avionics System San Diego CA USA Hughes Research Laboratories Inc. Malibu CA USA

A micromachined photoconductive sampling probe is used to determine detailed wave forms at different circuit nodes and corresponding propagation delays from within an InP HBT frequency divider operating at 2.7 GHz. The results demonstrate for the first time the capability of photoconductive probes for absolute-voltage, DC-coupled potential measurements in integrated circuits.

关键词： Microwave measurements Probes Sampling methods Photoconductivity Photoconducting devices Circuits Spatial resolution Optical sensors Ultrafast optics Aerospace electronics

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ATM local area networks: A survey of requirements, architectures, and standards

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IEEE COMMUNICATIONS MAGAZINE 1997年第7期35卷 72-80页

作者： Akyildiz, IF Bernhardt, KL School of Electrical and Computer Engineering Georgia Institute of Technology Communications System Center Georgia Institute of Technology

There is increasing interest in deploying ATM technology in local or campus networks. ATM is an ideal technology to overcome many of the limitations of today's LAN technologies. This article focuses on the application of ATM in the LAN environment to interconnect high-end host computers and on the interworking of ATM-based LANs with legacy LANs. In this article, the authors introduce ATM LAN requirements, followed by a discussion of possible ATM LAN architectures to support these requirements. The article then covers current standards and their relation to the possible architectures, and concludes with a discussion of current ATM LAN issues and directions.

关键词： Local area networks computer architecture Application software LAN interconnection

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Applying fuzzy functions and sequential coordination to optimization of machinery arrangement and pipe routing

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NAVAL ENGINEERS JOURNAL 1998年第6期110卷 43-54页

作者： Wu, BC Young, GS Schmidt, W Choppella, K Dr. Bi-Chu Wu:received a PhD in Mechanical Engineering from the University of Maryland College Park in 1991. She has worked on projects involving naval architecture design optimization solid mechanics and database development. Presently a senwr engineer with Angle Incorporated Dr Wu's research interests are in design optimization and fuzzy logic applications. Dr. Gin-Shu Young: a senior engineer with Angle Incorporated holds a PhD in Mechanical Engineering from the University of Maryland College Park. As a guest researcher with National Institute of Standards and Technologies from 1990 to 1993 he worked on vision-based navigation for autonomous vehicles. His experience also includes applications of optimization fuzzy logic neural network and genetic algorithm methods to engineering system design Mr. William Schmidt:co-founded Angle Incorporated in 1990 and has served as Vice PresidentlChiefScientist during this tame. He holds a B.Sc. in Applied Science from the Naval Acadt?my and an M.Sc. in Physics from the Naval Post Graduate School. He has cner 20 years experience in technical leadership material and personnel management. He has led the application of computer aided design (CAD) and Product Model Information Exchange to the shipbuilding industry. His experience also includes leading the amlication of model based operational analysis to support the Live Fire Test Program for DDG 51 Class Destroyers. Mr. Krishna M. Choppella:is a Sofware Engineer at Eidea Laboratories Incotporated where he works on componentbased distributed enterpvise frameworks. He has been involved in creating data analysis tools for the US Nay by integrating CAD modeis databases and graphical front ends. His work in the Masters degree program in Mechanical Engineering at the University of Texas at Austin was in di0ddase.r spectroscopy of combustion products in porous-matri burners. He received his Bachelors degree in Electrical Engineering in India. He was a Research Associate at the Centre for Laser Technology and Project Engi

Ship design is often multidisciplinary involving several design elements with various types of objectives and constraints (O/C) some easily described as mathematical formulas, others better modeled as descriptive assertions. This paper describes a method based on fuzzy functions and an integrated performance index to model O/C using descriptive assertions to be used with mathematical formulas in optimization. Another issue addressed in this paper concerns the coordination of design elements when sequentially coupled, that is, when one leads the other and the performance of the follower depends greatly on the design of the leader. Based on neuro-fuzzy techniques, the method described here coordinates and optimizes sequentially coupled elements. The two methods are applied to machinery arrangement (MA) and pipe routing (PR). Preliminary models for optimization of MA and PR are described considering convenience, producibility: engine room size, interference and location as factors in the O/C set. Some test results from MA/PR applications are presented and discussed. The methods are generic and can be extended to other elements in ship design. They are mutually independent and may be used separately Two advantages of their use are an improvement in overall performance and a reduction in the need for redesign of elements.

关键词： Optimization

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Channel carrying: a novel handoff scheme for mobile cellular networks

Channel carrying: a novel handoff scheme for mobile cellular...

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： J. Li N.B. Shroff E.K.P. Chong School of Electrical and Computer Engineering Purdue University West Lafayette IN USA Purdue University System West Lafayette IN US

We present a new scheme that addresses the call handoff problem in mobile cellular networks. Efficiently solving the handoff problem is important for guaranteeing quality of service (QoS) to already admitted calls in the network. Our scheme is based on a new concept called channel carrying: when a mobile user moves from one cell to another, under certain mobility conditions, the user is allowed to carry its current channel. We propose a new channel assignment scheme to ensure that this movement of channels will not lead to any extra co-channel interference or channel locking. In our scheme, the mobility of the channels relies entirely on localized information, and no global coordination is required. Therefore, the scheme is simple and easy to implement. We further develop a hybrid channel carrying scheme that allows us to maximize the performance under various constraints. We provide numerical results comparing our scheme with the traditional channel reservation techniques. We find that our scheme outperforms the reservation scheme over a broad range of traffic parameters.

关键词： Land mobile radio cellular systems Quality of service Frequency division multiaccess Multiaccess communication Intelligent networks Electronic mail Interchannel interference Interference constraints Telecommunication traffic Wireless communication

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Encoding and decoding of femtosecond pulses for code division multiple access communication systems using a pair of fiber-pigtailed pulse shapers

Encoding and decoding of femtosecond pulses for code divisio...

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IEEE Photonics Conference (IPC)

作者： H.P. Sardesai C.-C. Chang A.M. Weiner School of Electrical and Computer Engineering Purdue University West Lafayette IN USA Purdue University System West Lafayette IN US

In conclusion, we have demonstrated encoding-decoding operation at 1.55 /spl mu/m using a pair of low loss, fiber pigtailed pulse shapers. Fiber pigtailing has the advantage of true portability and cascadability without repeated complex alignment procedures. The low insertion loss makes the pulse-shaper an attractive candidate for use in fiber communication systems which operate at low average powers.

关键词： Encoding Decoding Pulse shaping methods Pulse amplifiers Optical fiber testing Doped fiber amplifiers Optical fiber communication Autocorrelation Erbium Pulse measurements

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Subspace Model Identification for Continuous-Time systems

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IFAC Proceedings Volumes 1997年第11期30卷 1567-1572页

作者： Zi-Jiang Yang Setsuo Sagara Kiyoshi Wada Faculty of Computer Engineering and System Science Kyushu Institute of Technology Iizuka Fukuoka 820 Japan TEL +81-948-29-7672 FAX +81-948-29-7651 Department of Communication Computer Engineering Fukuoka Institute of Technology Wajirohigashi Higashiku Fukuoka 811-02 Japan Department of Electrical and Electronic Systems Engineering Graduate School of Information Science and Electrical Engineering Kyushu University Hakozaki Fukuoka 812 Japan

Usually, the subspace-based state-space system identification algorithms are focused on discrete-time models, which may cause some numerical problems when the sampling interval is small. This paper proposes an algorithm of subspace-based state-space system identification for continuous-time systems from sampled input-output data. The ω — operator ω = ( p - α)/( p + α) where p denotes a differential operator and α > 0, is introduced to avoid direct numerical differentiations. And the ω — operator state-space model identified by the 4SID method can be transformed back to the common continuous-time state-space model. The numerical superiority of the ω — operator approach compared to some other methods is verified through simulation study.

关键词： Subspace model identification continuous-time system ω—operator sampled data

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Operational systems, logistics engineering and technology insertion

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NAVAL ENGINEERS JOURNAL 1997年第3期109卷 205-220页

作者： Grubb, MJ Skolnick, A Michael J. Grubb:has perfomzed naval engineering at the Crane Division Naval Surface Warfare Center (NSWC) for more than twenty-five years. He currently the program manager for the Sustainable Hardware and Affordable Readiness Practice Program (SHARP). is a Navy-wide logistics research and development prgram aimed at the successful transiton of proved technologies inot the fleet. SHARP focuses on reducing acquisition performance capability reliability maintainability and readiness of these systems. Mr. Grubb has served as a department director for the past eleven years. His most recent assignment was as director of the Tactical Computer Resources and Test Equipment Department. This organization provided acquisition and in-service engineering support of the Navy's tectical embedded computers priphirals displays and mass memory storage devices. The organization also provided a complete range of product engineering and metrology engineerig services for SSP NevSeaSysCom and the Trident Program. Prior to this appointment Mr. Grubb was deptuy director psysical security programs department and site responsible for program management and system integration of ashore integrated security systems. Mr. Grubb holds a B.S. degree in industrial engineering from Iowa State Universtiy an M.S. degree in industrial engineering from Purdue University and has copleted the course work (Dec.'96 for a master's degree in public and environment affairs at Indiana University-Purdue Univeristy Indianapolis. Dr. Alfred Skolnick operates System Science Consultants (SSC) specilizing in strategic planning technical program definiton technology assessment and engineering analyses on selected matters of national interest. He has taught physics mathematics and management sciences at University of Virginia and Marymount University and is currently adjunct professor of mathematics at Northern Virginia Community College. Form 1985 to 1989 he was president of the American Society of Noval Engineers. Dr. Skolnick served at Applied Physic

In an era of fiscal austerity, downsizing and unforgiving pressure upon human and economic capital, it is an Augean task to identify resources for fresh and creative work. The realities of the day and the practical demands of more immediate fleet needs can often dictate higher priorities. Yet, the Navy must avoid eating its seed corn. Exercising both technical insight and management foresight, the fleet, the R&D community, the Office of the Chief of Naval Operations (OpNav) and the product engineering expertise of the Naval Surface Warfare Center (NSWC) are joined and underway with integrated efforts to marry new, fully demonstrated technologies and operational urgencies. Defense funding today cannot sponsor all work that can be mission-justified over the long term because budgets are insufficient to support product maturation within the classical development cycle. However, by rigorous technical filtering and astute engineering of both marketplace capabilities and currently available components, it is possible in a few select cases to compress and, in effect, integrate advanced development (6.3), engineering development (6.4), weapon procurement (WPN), ship construction (SCN), operation and maintenance (O&M,N) budgetary categories when fleet criticalities and technology opportunities can happily meet. In short, 6.3 funds can be applied directly to ''ripe gateways'' so modern technology is inserted into existing troubled or aging systems, sidestepping the lengthy, traditional development cycle and accelerating practical payoffs to recurrent fleet problems. To produce such constructive results has required a remarkable convergence of sponsor prescience and engineering workforce excellence. The paper describes, extensively, the philosophy of approach, transition strategy, polling of fleet needs, technology assessment, and management team requirements. The process for culling and selecting specific candidate tasks for SHARP sponsorship (matching operational need with t

关键词： Naval vessels

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Quick-turnaround ASIC design in VHDL : core-based behavioral synthesis /

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丛书名： Kluwer international series in engineering and computer science

1996年

作者： Romdhane Mohamed S. Ben

ISBN: (纸本)0792397444

From the Publisher: Application-specific standard products (ASSPs) and application-specific integrated circuits (ASICs) are expected to become more than fifty percent of the $10 billion VLSI Digital Signal Processing (DSP) market in year 2000. With rapidly shrinking time-to-market (TTM) requirements, and multiple design goals that seek to optimize sample rate, clock speed, area, and power, the novel core-based behavioral synthesis methodology presented in this book shows how organizations can meet these new challenges effectively and consistently over the next decade. The authors show how VLSI chips can be rapidly designed within a VHDL-based synthesis environment using a pre-designed library of core components. The core library represents synthesizable units of behavior (function and control) that are both application-specific and organization-specific, empowering the chip designer with a competitive advantage. The key to the quick-turnaround is the high amount of systematic reuse utilized within the design methodology. The percolation of accurate power, speed, area, and timing information to higher levels of abstraction allows rapid and efficient exploration of the design space facilitating the optimization of these objectives individually or concurrently. system integration and test of ASICs into board-level designs is also facilitated. Quick-Turnaround ASIC Design with VHDL: Core-Based Behavioral Synthesis presents a new approach to behavioral synthesis that uses a pre-designed library of DSP cores, providing a highly competitive alternative to existing high-level synthesis tools for DSP.

关键词： Application specific integrated circuits Design Data processing. VHDL (computer hardware description language). computer-aided design.

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