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SIMULTANEOUS ALLOCATION AND SCHEDULING USING CONVEX PROGRAMMING TECHNIQUES

Parallel Processing Letters 1995年第4期5卷 587-598页

作者： SHANKAR RAMASWAMY PRITHVIRAJ BANERJEE Computational Science and Engineering 469 Computer Systems and Research Lab University of Illinois 1308 W. Main St. Urbana IL 61801 USA

Simultaneous exploitation of task and data parallelism provides significant benefits for many applications. The basic approach for exploiting task and data parallelism is to use a task graph representation (Macro Dataflow Graph) for programs to decide on the degree of data parallelism to be used for each task (allocation) and an execution order for the tasks (scheduling). Previously, we presented a two step approach for allocation and scheduling by considering the two steps to be independent of each other. In this paper, we present a new simultaneous approach which uses constraints to model the scheduler during allocation. The new simultaneous approach provides significant benefits over our earlier approach for the benchmark task graphs that we have considered.

关键词： Allocation scheduling convex programming task data parallelism

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laboratory investigation: Automatic identification of gray matter structures from MRI to improve the segmentation of white matter lesions

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computer Aided Surgery 1995年第6期1.0卷 326-338页

作者： Warfield, Simon Dengler, Joachim Zaers, Joachim Guttmann, Charles R.G. Wells, William M. Ettinger, Gil J. Hiller, John Kikinis, Ron School of Computer Science and Engineering University of New South Wales Sydney Australia Vision Systems Neckargemuend Germany German Cancer Research Center Heidelberg Germany Department of Radiology Harvard Medical School and Brigham and Women's Hospital Boston MA United States AI Lab NE43-771 Massachusetts Institute of Technology Cambridge MA United States Department of Radiological Sciences UCLA School of Medicine Los Angeles CA United States

The segmentation of MRI scans of patients with white matter lesions (WML) is difficult because the MRI characteristics of WML are similar to those of gray matter. Intensity-based statistical classification techniques misclassify some WML as gray matter and some gray matter as WML. We developed a fast elastic matching algorithm that warps a reference data set containing information about the location of the gray matter into the approximate shape of the patient's brain. The region of white matter was segmented after segmenting the cortex and deep gray matter structures. The cortex was identified by using a three-dimensional, region-growing algorithm that was constrained by anatomical, intensity gradient, and tissue class parameters. White matter and WML were then segmented without interference from gray matter by using a two-class minimum-distance classifier. Analysis of double-echo spin-echo MRI scans of 16 patients with clinically determined multiple sclerosis (MS) was carried out. The segmentation of the cortex and deep gray matter structures provided anatomical context. This was found to improve the segmentation of MS lesions by allowing correct classification of the white matter region despite the overlapping tissue class distributions of gray matter and MS lesion. © 1995 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted.

关键词： Gray matter MRI MS lesion Segmentation

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H ∞ Control for systems with Sector Bound Nonlinearities

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IFAC Proceedings Volumes 1995年第14期28卷 251-255页

作者： W. Zhan L.Y. Wang Y. Liu J. Sun Wayne State University Department of Electrical & Computer Engineering Detroit MI 48202 USA Robert Borsch Corporation 38000 Hills Tech Dr. 48331 Farmington Hills MI USA Ford Research Lab. Control Systems Department MD1170 SRL P. O. Box 2053 48121-2053 Dearborn MI USA

In this article, we study the H ∞ control problem for systems with sector bound nonlinearities. A natural candidate for the energy function is given based on stability analysis results of Lur’e systems. Sufficient conditions are derived in terms of algebraic matrix inequalities, which are much simpler to solve than the general Hamilton-Jacobi-Isaacs inequalities. A suboptimal control law is given. Comparison between the results in this paper and some existing results on robust H ∞ control for linear systems is made. The necessary and sufficient condition obtained by using linear robust design with the sector bound nonlinearities treated as uncertainties in the linear system is shown to be implied by one of the conditions we obtain with some special choice of a design parameter p . In general, when p ≠ 0 the feedback law is nonlinear.

关键词： H ∞ control nonlinear systems feedback sector bound nonlinearity

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Development of machining alternatives, based on MRSEVs

Development of machining alternatives, based on MRSEVs

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ASME 1993 International computers in engineering Conference and Exposition, CIE 1993

作者： Nau, Dana S. Gupta, Satyandra K. Kramer, Thomas R. Regli, William C. Zhang, Guangmlng Dept. of Computer Science Inst. for Systems Research University of Maryland College ParkMD United States Dept. of Mechanical Eng. Inst. for Systems Research University of Maryland College ParkMD United States Robot Systems Division Manufacturing Eng. Lab NIST GaithersburgMD United States Automation Systems Division Engineering Design Laboratory NIST GaithersburgMD United States

ISBN: (纸本)9780791897645

One missing link between CAD and CAM is the lack of a systematic methodology for generating and evaluating alternative ways to manufacture a proposed design. To address this problem, we are developing a systematic approach for generating and evaluating alternative ways to manufacture machined parts, in order to provide information to the designer about the manufacturability of the proposed design, and information to the process engineer about how best to machine the part. This paper describes our overall approach, and how MRSEVs (Material Removal Shape Element Volumes, a STEP library of machining features) can be used to support it. © 1993 ASME 1993 International computers in engineering Conference and Exposition, CIE 1993. All rights reserved.

关键词： Manufacture

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Variable-Structured robust PI controller by fuzzy logic for servomotor

Variable-Structured robust PI controller by fuzzy logic for ...

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1993 IEEE International Symposium on Industrial Electronics, ISIE 1993

作者： Suyitno, Amin Fujikawa, J. Kobayashi, H. Dote, Yasuhiko Department of Computer Science and Systems Engineering Muroran Institute of Technology Mlzumoto 27-1 Muroran050 Japan Technical Research Lab. Toyo Electric Mfg. Co. Ltd 338-1 Kamisoyagi Yamamoto-city Kanagawa-pref.242 Japan

ISBN: (纸本)0780312279

This paper proposes a variable-structured robust PI controller whose structure is continuously changed by fuzzy logic such that the controller makes the system respond quickly if the error e is large or if its rate e is large, the integrator gain is very large and vice versa in order to obtain a robust PI controller which is insensitive to both the plant noise and the observation noise. Then, it is practically applied to speed control for an induction servomotor. Experiments show that the proposed controller is superior to both a sliding mode controller and a PID controller. The paper includes the stability analysis of the overall system and the design procedure by using Popov's stability criterion. © Institute of Electrical and Electronics Engineers Inc. All rights reserved.

关键词： Fuzzy logic

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Interactive tools for signal processing education. The signal processing instructional facility (SPIF lab) at Washington State University

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computer Applications in engineering Education 1993年第6期1卷 517-517页

作者： Bamberger, R.H. Signal Processing Instructional Facility School of Electrical Engineering and Computer Science Washington State University Pullman WA 99164-2752 Dr. Roberto H. Bamberger:was born on January 30 1965 in Buenos Aires Argentina. He received his B.E.E and PhD from the Georgia Institute of Technology in 1986 and 1990 respectively. Currently Dr. Bamberger is an assistant professor in the School of Electrical Engineering and Computer Science at Washington State University. Dr. Bamberger's research program is focused on the design implementation and application of multidimensional multirate filter banks subband image and video compression analysis of nonstationary data and application of digital signal processing techniques in the design of analog and mixed-mode integrated circuits. Dr. Bamberger is the founder and director of the Signal Processing Instructional Facility (SPIF Lab) at Washington State University. The SPIF Lab features interactive multimedia-based tools for teaching concepts related to linear systems theory. Dr. Bamberger is active in developing multimedia-based instructional laboratories for a variety of other topics as well. In addition to his teaching and research programs Dr. Bamberger is an associate editor for theIEEE Transactions on Signal Processingand a member of the editorial board forComputer Applications in Engineering Education. Dr. Bamberger is also advisor to the WSU Student Branch of the IEEE and assistant director of the WSU Cougar Marching Band. Dr. Bamberger is a member of Phi Eta Sigma Eta Kappa Nu Tau Beta Pi and Kappa Kappa Psi.

The Signal Processing Instructional Facility (SPIF lab) is an experiment in using in interactive multimedia for teaching concepts related to linear systems theory and signal processing. The goals of the SPIF lab are to augment, enhance, and interconnect sophomore, junior, and senior level courses with the common thread of linear systems and transforms by unifying the experimentation medium. In this fashion, physical phenomenon is returned to the forefront of engineering education. The laboratory features powerful Mathematica Notebooks (a form of hypertext) and interactive applications that use dedicated DSP microprocessors.

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Microcellular radio performance in a Rayleigh/ Rician cochannel interference environment 1

Microcellular radio performance in a Rayleigh/ Rician cochan...

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1st International Conference on Universal Personal Communications, ICUPC 1992

作者： Haug, John R. Ucci, Donald R. Communication Systems Research Lab Corporate Research and Development Center Motorola Inc SchaumburgIL60196 United States Electrical and Computer Engineering Department Illinois Institute of Technology ChicagoIL60616 United States

ISBN: (纸本)0780305914

In a recent paper Haug and Ucci (see IEEE International Conf. on Communications, p.306, 1992) investigated the case in which the desired signal in Rayleigh faded and a cochannel interferer is Rician faded. It was assumed in that study that the coverage area is interference-limited and not noise-limited. In the present report it is further required that a signal-to-noise ratio (SNR) sufficient to give satisfactory radio reception be present at the receiver. An analytic expression for outage probability under these conditions is determined. © 1992 IEEE.

关键词： Cochannel interference

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Outage probability of microcellular radio systems in a Rayleigh/Rician fading environment

Outage probability of microcellular radio systems in a Rayle...

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1992 IEEE International Conference on Communications: Discovering a New World of Communications, SUPERCOMM/ICC 1992

作者： Haug, John R. Ucci, Donald R. Communication Systems Research Lab Corporate Research and Development Center Motorola Inc. SchaumburgIL60196 United States Electrical and Computer Engineering Department Illinois Institute of Technology ChicagoIL60616 United States

ISBN: (纸本)078030599X

An expression is derived for outage probabilities in a microcellular radio system in which the desired radio signal is Rayleigh faded while an interfering signal is Rician faded. At low average SIR this Rayleigh/Rician fading environment is shown to exhibit a higher outage probability than that expected in cellular systems in which both desired and interfering signals are Rayleigh faded. However, at high average SIR the performance predicted by either model is the same. © 1992 IEEE.

关键词： Microcellular radio systems

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Microcellular radio performance in a Rayleigh/Rician cochannel interference environment

Microcellular radio performance in a Rayleigh/Rician cochann...

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International Conference on Universal Personal Communications

作者： J.R. Haug D.R. Ucci Communication Systems Research Lab Corporate Research and Development Center Motorola Inc. Schaumburg IL USA Electrical and Computer Engineering Department Illinois Institute of Technology Chicago IL USA

关键词： Rician channels Interchannel interference Receivers Rayleigh scattering Land mobile radio research and development Fading Base stations Fuses Probability density function

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Bipolar operational amplifier powered by a 1 V battery

Bipolar operational amplifier powered by a 1 V battery

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Mediterranean Electrotechnical Conference (MELECON)

作者： A. Mavretic M. Jenko Department of Electrical Computer and Systems Engineering Microelectronics Research Lab Boston University Boston MA USA

The design of a micropower op amp suitable for biomedical applications is presented. A 1-V battery is used for powering the circuit. The quiescent power consumption is under 300 mu A. Current boosting is employed to achieve a maximal output swing very close to the power supply rails for low impedance loads. The input stage consists of p-n-p transistors in differential configuration. The gain stage is a common emitter amplifier with n-p-n transistors. The output stage is a class AB amplifier with both n-p-n and p-n-p transistors driven by unique current amplifiers.< >

关键词： Operational amplifiers Power amplifiers Batteries Circuits Transconductance Voltage Impedance Temperature Energy consumption Power supplies

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