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Proceedings of the 19th International Conference on Neural Information Processing systems

作者： O. Patrick Kreidl Alan S. Willsky Department of Electrical Engineering and Computer Science MIT Laboratory for Information and Decision Systems Cambridge MA

Given a directed graphical model with binary-valued hidden nodes and real-valued noisy observations, consider deciding upon the maximum a-posteriori (MAP) or the maximum posterior-marginal (MPM) assignment under the restriction that each node broadcasts only to its children exactly one single-bit message. We present a variational formulation, viewing the processing rules local to all nodes as degrees-of-freedom, that minimizes the loss in expected (MAP or MPM) performance subject to such online communication constraints. The approach leads to a novel message-passing algorithm to be executed offline, or before observations are realized, which mitigates the performance loss by iteratively coupling all rules in a manner implicitly driven by global statistics. We also provide (i) illustrative examples, (ii) assumptions that guarantee convergence and efficiency and (iii) connections to active research areas.

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Joint Scheduling of Rate-guaranteed and Best-effort Services over a Wireless Channel

Joint Scheduling of Rate-guaranteed and Best-effort Services...

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IEEE Conference on decision and control

作者： M. Zafer E. Modiano Laboratory for Information and Decision Systems Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology USA

We address multi-user scheduling over the down-link channel in wireless data systems. Specifically, we consider a time-slotted system with a single transmitter serving multiple users. With fixed power transmission, the channel condition of a user determines the reliable rate of communication to that user in a particular time-slot. The user set consists of, (i) throughput guaranteed (QoS) users, and, (ii) best effort (BE) users. For such a system we obtain the optimal policy that serves the QoS users with minimum time-slot utilization, thereby, maximizing the remaining fraction of time-slots allocated to the BE users. We present a simple geometric visualization of the optimal policy. In the special scenario of symmetric Rayleigh fading, we obtain explicit formulas that relate the achievable throughput rate guarantee to the number of QoS users supportable and the fraction of time-slots allocated to the BE users. Finally, we compare the throughput results for the optimal policy with the random-scheduling policy and show that gains on the order of ln(N) can be achieved by exploiting multi-user diversity, where N is the number of QoS users.

关键词： Quality of service Throughput Downlink Data systems Rayleigh channels Delay Time varying systems Base stations Mobile handsets Space technology

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A neural network based Wide Area Monitor for a power system

A neural network based Wide Area Monitor for a power system

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2005 IEEE Power engineering Society General Meeting

作者： Li, Xiaomeng Venayagamoorthy, Ganesh K. IEEE Real-Time Power and Intelligent Systems Laboratory University of Missouri Rolla MO 65409 United States Department of Electrical and Computer Engineering University of Missouri Rolla United States South African Institute of Electrical Engineers IEEE St. Louis Computational Intelligence Department of Task Force on Intelligent Control Systems Secretary of the Intelligent Systems Subcommittee IEEE Power Engineering Society

ISBN: (纸本)078039156X

With the deregulation of power industry, many tie lines between control areas are driven to operate near their maximum capacity, especially those serving heavy load centers. Wide area controllers (WACs) using wide-area or global signals can provide remote auxiliary control signals to local controllers such as automatic voltage regulators, power system stabilizers, etc to damp out inter-area oscillations. The power system is highly nonlinear system with fast changing dynamics. In order to have an efficient WAC, an online system monitor/predictor is required to provide inter-area information to the WAC from time to time. This paper presents the design of an online Wide Area Monitor (WAM) using a neural network called the Wide Area Neuroidentifier (WANI). The WANI is used to predict ahead the speed deviations of generators in the different areas using phasor measurement unit (PMU). Results are presented to show the effectiveness of the wide area monitor for different disturbances. © 2005 IEEE.

关键词： Wide area networks

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Learning control: The state of the art and perspective

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Zidonghua Xuebao/Acta Automatica Sinica 2005年第6期31卷 943-955页

作者： Xu, Jian-Xin Hou, Zhong-Sheng Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 117576 Singapore Singapore Advanced Control Systems Laboratory School of Electronics and Information Engineering Beijing Jiaotong University Beijing 100044 China

The recent advances in learning control theory are reviewed. First insight is provided into the concept and principle associated with learning control under a repeatable control environment. Then a briefing is given to the two main streams of learning control-iterative learning control and repetitive control. Subsequently we survey several hot topics in the field of learning control. New trends in learning control using Lyapunov methods are also sketched, followed by remarks on future directions.

关键词： Learning systems

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Conservation of filtering in manufacturing systems

Conservation of filtering in manufacturing systems

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作者： Li, Jingshan Enginarlar, Emre Meerkov, Semyon M. Manufacturing Systems Research Lab General Motors Research and Development Center Warren MI 48090-9055 United States Decision Applications Division Los Alamos National Laboratory Los Alamos NM 87545 United States Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109-2122 United States

ISBN: (纸本)008045108X

This paper addresses the issue of reliable satisfaction of customer demand by unreliable production systems. Using a simple Production-Storage-Customer model, we show that this can be accomplished by filtering out production randomness. The filtering of randomness is ensured by finished goods buffers (filtering in space) and shipping periods (filtering in time). The following question is considered: How are filtering in space and in time interrelated? As an answer, we show that there exists a conservation law: in lean manufacturing systems, the amount of filtering in space multiplied by the amount of filtering in time (both measured in appropriate dimensionless units) is practically constant. Copyright © 2005 IFAC.

关键词： Manufacture

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CONSERVATION OF FILTERING IN MANUFACTURING systems

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IFAC Proceedings Volumes 2005年第1期38卷 165-170页

作者： Jingshan Li Emre Enginarlar Semyon M. Meerkov Manufacturing Systems Research Lab General Motors Research & Development Center Warren MI 48090-9055 Decision Applications Division Los Alamos National Laboratory Los Alamos NM 87545 Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109-2122

This paper addresses the issue of reliable satisfaction of customer demand by unreliable production systems. Using a simple Production-Storage-Customer model, we show that this can be accomplished by filtering out production randomness. The filtering of randomness is ensured by finished goods buffers (filtering in space) and shipping periods (filtering in time). The following question is considered: How are filtering in space and in time interrelated? As an answer, we show that there exists a conservation law: In lean manufacturing systems, the amount of filtering in space multiplied by the amount of filtering in time (both measured in appropriate dimensionless units) is practically constant.

关键词： Manufacturing systems Filtering Conservation law

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Generating multi-folded torus chaotic attractors

Generating multi-folded torus chaotic attractors

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International Conference on Physics and control

作者： Simin Yu Jinhu Lu Henry Leung Guanrong Chen College of Automation Guangdong University of Technology Guangzhou China Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy and Sciences Beijing China Department of Electrical and Computer Engineering University of Calgary AB Canada Department of Electronic Engineering City University of Hong Kong China

A systematic methodology for generating multi-folded torus chaotic attractors from a simple three-dimensional piecewise-linear system is presented in this paper. Theoretical analysis shows that multi-folded torus chaotic attractors can be created via alternative switching between two piecewise-linear systems. A novel circuit diagram is designed for physically creating multi-folded torus chaotic attractors. This is the first time in the literature to experimentally verify a maximum 9-folded torus chaotic attractor that is generated by an analog circuit.

关键词： Chaos Piecewise linear techniques Oscillators Laboratories Analog circuits Electric breakdown Bifurcation Educational institutions Automation Automatic generation control

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Hybrid discrete event simulation with model predictive control for semiconductor supply-chain manufacturing

Hybrid discrete event simulation with model predictive contr...

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Simulation Winter Conference

作者： H.S. Sarjoughian Dongping Huang G.W. Godding Wenlin Wang D.E. Rivera K.G. Kempf H.D. Mittelmann Arizona Center for Integrative Modeling & Simulation Computer Science & Engineering Department Arizona State University Tempe AZ USA Control Systems Engineering Laboratory Chemical & Materials Engineering Department Arizona State University Tempe AZ USA Decision Technologies Intel Corporation Chandler AZ USA Mathematics & Statistic Dept. Arizona State University Tempe AZ USA

Simulation modeling combined with decision control can offer important benefits for analysis, design, and operation of semiconductor supply-chain network systems. Detailed simulation of physical processes provides information for its controller to account for (expected) stochasticity present in the manufacturing processes. In turn, the controller can provide (near) optimal decisions for the operation of the processes and thus handle uncertainty in customer demands. In this paper, we describe an environment that synthesizes discrete-event system specification (DEVS) with model predictive control (MPC) paradigms using a knowledge interchange broker (KIB). This environment uses the KIB to compose discrete event simulation and model predictive control models. This approach to composability affords flexibility for studying semiconductor supply-chain manufacturing at varying levels of detail. We describe a hybrid DEVS/MPC environments via a knowledge interchange broker. We conclude with a comparison of this work with another that employs the Simulink/MATLAB environment.

关键词： Discrete event simulation Predictive models Predictive control Virtual manufacturing Semiconductor device manufacture Mathematical model Analytical models Manufacturing processes Optimal control Uncertainty

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Virtual attractive-repulsive potentials for cooperative control of second order dynamic vehicles on the Caltech MVWT

Virtual attractive-repulsive potentials for cooperative cont...

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American control Conference (ACC)

作者： B.Q. Nguyen Yao-Ling Chuang D. Tung Chung Hsieh Zhipu Jin Ling Shi D. Marthaler A. Bertozzi R.M. Murray Department of Electrical Engineering Vision Laboratory University of California Los Angeles Los Angeles CA USA Department of Physics Duke University Durham NC USA Department of Computer Science Vision Laboratory University of California Los Angeles Los Angeles CA USA Department of Electrical Engineering California Institute of Technology Pasadena CA USA Control and Dynamical Systems California Institute of Technology Pasadena CA USA Department of Mathematics Vision Laboratory University of California Los Angeles Los Angeles CA USA

We consider a motion planning method based on cooperative biological swarming models with virtual attractive and repulsive potentials (VARP). We derive a map between the model and fan speeds for the Kelly, a second order vehicle on the Caltech multi vehicle wireless testbed. The motion planning map results leads to the development and implementation of a point to point controller which is subsequently used as part of a cooperative searching algorithm. The VARP control method is scalable and can be used to organize a swarm of robotic vehicles.

关键词： Vehicle dynamics Motion control Biological system modeling Testing Open loop systems Motion planning Robot kinematics Remotely operated vehicles Equations Propulsion

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Network coding for wireless applications

Network coding for wireless applications

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Unmanned/Unattended Sensors and Sensor Networks II

作者： Lun, Desmond S. Ahmed, Ebad Brothers, L. Reggie DeBardelaben, James A. Effros, Michelle Ho, Tracey Karger, David Koetter, Ralf Lee, Anna MacMullan, Samuel J. Médard, Muriel Zhao, Fang Laboratory for Information and Decision Systems Massachusetts Institute of Technology Cambridge MA 02139 United States DARPA ATO 3701 N. Fairfax Dr. Arlington VA 22203 United States Johns Hopkins University Applied Physics Laboratory 11100 Johns Hopkins Rd. Laurel MD 20769 United States Data Compression Laboratory California Institute of Technology Pasadena CA 91125 United States Department of Electrical Engineering California Institute of Technology Pasadena CA 91125 United States Computer Science and Artificial Intelligence Laboratory Massachusetts Institute of Technology Cambridge MA 02139 United States Coordinated Science Laboratory University of Illinois at Urbana-Champaign Urbana IL 61801 United States Lorenz Research Associates Inc. 4443 Brookfield Corporate Dr. Chantilly VA 20151 United States

The advent of network coding promises to change many aspects of networking. Network coding moves away from the classical approach of networking, which treats networks as akin to physical transportation systems. We overview some of the main features of network coding that are most relevant to wireless networks. In particular, we discuss the fact that random distributed network coding is asymptotically optimal for wireless networks with and without packet erasures. These results are extremely general and allow packet loss correlation, such as may occur in fading wireless channels. The coded network lends itself, for multicast connections, to a cost optimization which not only outperforms traditional routing tree-based approaches, but also lends itself to a distributed implementation and to a dynamic implementation when changing conditions, such as mobility, arise. We illustrate the performance of such optimization methods for energy efficiency in wireless networks and propose some new directions for research in the area.

关键词： Signal encoding

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