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Advances in transistor timing, simulation, and optimization (embedded tutorial) (abstract only) 99

Advances in transistor timing, simulation, and optimization ...

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Proceedings of the 1999 IEEE/ACM international conference on Computer-aided design

作者： Jacob Avidan Abe Elfadel D. F. Wong Jacob White

ISBN: (纸本)9780780358324

A translator-level view of the circuit design has become of paramount importance for successful designs, especially in the very demanding context of high-performance microprocessor design in the deep-submicron regime. In this tutorial, such a transistor-level view will be adopted. The VLSI custom design problem will be approached from the three perspectives of transistor-level static timing analysis, fast transistor-level simulation, and transistor-level optimization process. Specifically, the first part of this tutorial will deal with the techniques used in transistor-level static timing, highlighting the differences between gate and transistor level techniques. It will also focus on how delay calculation, false path elimination and timing checks are performed at the transistor level for both combinational and sequential circuits. A fundamental ingredient of transistor-level static timing analyzers is a fast, event-driven transistor-level circuit simulator. The second part of this tutorial will present an important class of such simulators that uses simplified yet accurate transistor models. Simulators using piece-wise constant and piece-wise linear models will be described and contrasted. Methods for computing circuit sensitivities using these simulators will be covered. Finally, the third part will present some of the very recent advances in transistor-level circuit optimization. In particular, the timing-driven custom design problem will be rigorously formalized as a constrained, nonlinear optimization problem with respect to both the geometric and timing variables of the circuit. Although the resulting problems are large-scale, it will be shown how formal optimization algorithms can solve them efficiently. The tradeoffs between circuit size, device model accuracy, and algorithmic efficiency will be discussed, and generalizations of these techniques to simultaneous device and wire sizing will be considered.

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Determination of the design parameters of passive harmonic filters using nonlinear optimization.

Determination of the design parameters of passive harmonic f...

引用

IEEE Industrial and Commercial Power Systems Technical conference

作者： Upadhye, SD Atre, YR Tata Infotech Ltd Pune 400096 Maharashtra India

ISBN: (纸本)0780345096

Power system harmonics are a menace with disastrous consequences. A number of ways were tried out to tackle the harmonic problem posed by nonlinear electric devices, but by far, the most popular and quite effective one is the use of passive filters. This provides a low impedance path to a harmonic or a group of harmonics. Usually the AC harmonics are odd harmonics. So normally the filter combination selected is such that for the predominant harmonics, one or more single tuned filters are used, and for the rest of the harmonics, a high pass filter is used. An alternate combination is that a damped filter is used for the two predominant harmonics with the filter being tuned at a frequency in between the two harmonics and another damped filter for the higher harmonics. If all the harmonics are not of very high magnitude then usually one high pass filter is sufficient for all the harmonics. Instead of the conventional design of these filters, which is based on experience of the designer, a better way is to use the optimization algorithms to obtain maximum performance from these filters. © 1998 IEEE.

关键词： high pass filters

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nonlinear identification of control systems

Nonlinear identification of control systems

引用

1998 American Control conference, ACC 1998

作者： Lyshevski, Sergey Edward Department of Electrical Engineering Purdue University at Indianapolis 723 West Michigan Street SL 160B Indianapolis IN 46202-5132 United States

ISBN: (纸本)0780345304

nonlinear system identification of dynamic systems is a topic of growing interest. The ability of model-based systems analysis and design to attain the desired objectives depends to a large degree on the accuracy of the mathematical models derived and parameters used. To avoid deficiencies associated with model validation and order estimation, accurate mathematical models should be found by using the fundamental laws, and the unknown parameters have to be identified to perform analysis, design, and prototyping. This paper thoroughly studies the model-relevant identification concept for continuous-time nonlinear multi-input/multi-output systems in time-domain by using a nonlinear mapping-based identification framework. Discrete-time and hybrid systems play an important role due to microprocessor-, microcomputer-, and DSP-based hardware platforms applied to implement comprehensive control algorithms in order to attain the desired objectives, specifications, and capabilities. However, the majority of systems to be controlled are continuous-time, and analog control is a manageable and straightforward solution in many practical problems. The importance of the researched time-domain concept lies on the need to identify continuous-time systems to be used in the corresponding analysis, design, stabilization, and optimization. As an illustrative example, the unknown parameters of a high-performance aircraft are identified using the flight data. © 1998 AACC.

关键词： Continuous time systems

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Managing function constraints in design sheet™

Managing function constraints in design sheet™

引用

ASME 1998 Design Engineering Technical conferences, DETC 1998

作者： Reddy, Sudhakar Y. Fertig, Kenneth W. Rockwell Science Center 444 High Street Palo AltoCA94301 United States

ISBN: (纸本)9780791880333

Design Sheet™ is a constraint management system specially designed for doing conceptual design cost and performance tradeoff studies. It represents the design models as constraints between design variables, and uses graph-theoretic algorithms to decompose large systems of nonlinear equations into smaller pieces that can be solved robustly. This paper describes extensions to Design Sheet that enable it to manage functions as variables in a constraint network. The paper also discusses the new capabilities of function encapsulation and explicit differentiation that are built on top of these extensions. The ability to encapsulate a part of the constraint network into a function, and use it in other constraints, promotes model reuse and improves computational efficiency. The capability to automatically differentiate certain variables with respect to other design variables allows Design Sheet to be used for solving practical optimization problems. In combination with the tradeoff capability, this enables the designer to track changing optima in trade studies. The paper also provides a couple of optimization examples to demonstrate these new capabilities. Copyright © 1998 by ASME.

关键词： Graph theory

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7th AIAA/USAF/NASA/ISSMO Symposium on Multidisciplinary Analysis and optimization, 1998

7th AIAA/USAF/NASA/ISSMO Symposium on Multidisciplinary Anal...

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7th AIAA/USAF/NASA/ISSMO Symposium on Multidisciplinary Analysis and optimization, 1998

The proceedings contain 254 papers. The special focus in this conference is on Multidisciplinary Analysis and optimization. The topics include: Multidiscipline design as applied to space;multidisciplinary design practices from the F-16 agile falcon;the role of MDO within aerospace design and progress towards an MDO capability;a web-based monitoring system for multidisciplinary design projects;visualizing the optimization process in real-time using physical programming;impact of parallel computing on high fidelity based multidisciplinary analysis;recent developments of sizing optimization with abaqus code;sensitivity analysis for turbine blade components;acceleration of multidisciplinary analysis solvers by inexact subsystem simulations;multidisciplinary design optimization techniques for branching trajectories;interactive multiobjective two-level optimization of dissatisfaction level of structures;development of multiple cycle coupling suspension in complex system optimization;using approximate models for engineering design;a derivative free optimization algorithm in practice;application studies using the 3dopt integrated design system;design sensitivity analysis and optimization of nonlinear structural dynamics using dyna3d;sensitivity derivatives of a rotor CFD code via automatic differentiation;development of a flexible design optimization study tool;issues in industrial multidisciplinary optimization;considerations in the performance of large structural optimization tasks;crashworthiness design using structural optimization;analysis-test correlation and model updating of dynamic systems using MDO software tools;MDO technology needs in aeroelastic structural design;a collaborative optimization environment for turbine engine development;the challenge and promise of blended-wing-body optimization and development of a multi-disciplinary computing environment.

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Word-length optimization for high-level synthesis of digital signal processing systems

Word-length optimization for high-level synthesis of digital...

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IEEE Workshop on Signal Processing Systems (SIPS)

作者： K.-I. Kum W. Sung School of Electrical Engineering Seoul National University Seoul South Korea

Word-length optimization software is developed not only to reduce the hardware cost but also to minimize the optimization time. It inserts quantizers to a data flow graph representation, partitions the resultant graph, determines the minimum required word-length for each partitioned signal, conducts scheduling and binding using the minimum word-length information, and finally optimizes the word-lengths of functional units. Fixed-point simulation results are used as for the performance measure, thus this method can be applied to nonlinear and time-varying algorithms. Although this approach requires iterative fixed-point simulations, the search space is reduced significantly by grouping signals using the high-level synthesis, or hardware sharing, results. A fourth-order IIR filter, a fifth-order elliptic filter, and a 12th-order adaptive LMS filter are implemented using this software. The hardware cost of functional units is reduced by 25% in the IIR filter and 7% in the elliptic filter compared to the previous results.

关键词： high level synthesis IIR filters Hardware Cost function Adaptive filters Flow graphs Partitioning algorithms Iterative algorithms Iterative methods Least squares approximation

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Planware-domain-specific synthesis of high-performance schedulers

Planware-domain-specific synthesis of high-performance sched...

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IEEE International conference on Automated software Engineering (ASE)

作者： L. Blaine L. Gilham Junbo Liu D.R. Smith S. Westfold Kestrel Institute Palo Alto CA USA

Planware is a domain-specific generator of high-performance scheduling software, currently being developed at the Kestrel Institute. Architecturally, Planware is an extension of the Specware system with domain-independent and domain-dependent parts. The domain-independent part includes a general algorithm design facility (including mechanisms to synthesize global-search and constraint propagation algorithms), as well as support for theorem-proving and witness finding. The domain-dependent part includes scheduling domain knowledge and architecture representations, and other domain-specific refinement knowledge that relates the scheduling domain to general algorithm design and data type refinement. Using Planware, the user interactively specifies a problem and then the system automatically generates a formal specification and refines it.

关键词： Scheduling algorithm Algorithm design and analysis Process design Logic Taxonomy Formal specifications Constraint theory Constraint optimization Design optimization Transportation

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Determination of the design parameters of passive harmonic filters using nonlinear optimization

Determination of the design parameters of passive harmonic f...

引用

Annual Meeting Industrial and Commercial Power Systems Technical conference

作者： S.D. Upadhye Y.R. Atre Senior Systems Analyst Tata Infotech Limited Pune India Department of Electrical Engineering Walchand College of Engineering Sangli India

关键词： Harmonic filters Design optimization Power harmonic filters Frequency Tuning Impedance Circuit optimization Inductors Ear Power system harmonics

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System identification and machine setup of color xerographic machines using multivariate modeling and multiobjective optimization

System identification and machine setup of color xerographic...

引用

IEEE conference on Control Technology and Applications (CCTA)

作者： Sudhendu Rai Xerox Corporation Webster NY USA

ISBN: (纸本)078034104X

This paper describes an approach for performing system identification of the xerographic process and developing a model of the overall system. The experiment design is performed using orthogonal arrays. A nonlinear system model defining a vector mapping between the actuators and performance metrics is constructed using multivariate adaptive regression splines. These models provide a basis for providing automated and optimal machine setup on color machines. Multiobjective optimization techniques based on an underlying adaptive simulated annealing approach are discussed, which are then used for determining the Pareto-optimal set-points. The overall approach is applied to perform the automated setups of a high-end color machine-the Docucolor 40. Experimental results show that high quality machine setups can be performed in an efficient and automated manner. The use of these set-points as the basis of linearization about a nominal set-point for use in linear control algorithms are also discussed.

关键词： System identification Photoreceptors Corona Mars Electrophotography Voltage Dielectric substrates Pixel Image converters nonlinear systems

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nonlinear identification of control systems

Nonlinear identification of control systems

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American Control conference (ACC)

作者： S.E. Lyshevski Department of Electrical Engineering Purdue University Indianapolis IN USA

关键词： nonlinear control systems Control systems Mathematical model Time domain analysis nonlinear systems nonlinear dynamical systems System analysis and design performance analysis Prototypes Hardware

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