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IEEE International Workshop on Factory Communication systems (WFCS)

作者： Kwan-Joo Myoung Dong-Sung Kim Wook Hyun Kwon Engineering Research Center for Advanced Control Instrument Control Information Systems Laboratory School of Electrical Engineering and Computer Science Seoul National University Seoul South Korea

In this paper, a virtual factory using the manufacturing message specification (MMS) companion standard is implemented. The MMS companion standard (9506-3/spl sim/9506-7) and virtual machines are designed and implemented for robot, numerical controller (NC), programmable logic controller (PLC), and process control (PC). Finally, the MMS Internet monitoring system (MIMS) is developed for the testing system.

关键词： Production facilities Virtual manufacturing TCPIP Programmable control Virtual machining Condition monitoring Virtual machine monitors Manufacturing automation computer integrated manufacturing Control systems

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Graph partitioning for parallel applications in heterogeneous Grid environments

Graph partitioning for parallel applications in heterogeneou...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： S. Kumar S.K. Das R. Biswas Department of Computer Science & Engineering University of Texas Arlington Arlington TX USA NASA Advanced Supercomputing Division NASA Ames Research Center Moffett Field CA USA

The problem of partitioning irregular graphs for parallel computations on homogeneous systems has been extensively studied. However these solutions fail when the target system architecture exhibits heterogeneity in resource characteristics. With the emergence of technologies such as the Grid, it is imperative to study the partitioning problem in the context of distributed heterogeneous systems. In our Grid model, the system consists of processors with varying computational power that are connected via a non-uniform communication network. We present a novel multilevel partitioning algorithm, called MiniMax, for irregular graphs that takes into account issues pertinent to Grid computing environments. The proposed scheme generates and maps partitions onto a heterogeneous system with the objective of minimizing the maximum execution time of the parallel distributed application. Simulation results for both synthetic and real workloads demonstrate that MiniMax generates high quality partitions for various classes of applications targeted for parallel execution in a distributed heterogeneous environment.

关键词： Grid computing Minimax techniques Concurrent computing computer architecture Context Power system modeling computer networks Communication networks Partitioning algorithms Distributed power generation

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A de-centralized scheduling and load balancing algorithm for heterogeneous grid environments

A de-centralized scheduling and load balancing algorithm for...

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International Conference on Parallel Processing Workshops (ICPPW)

作者： M. Arora S.K. Das R. Biswas Department of Computer Science & Engineering University of Texas Arlington Arlington TX USA NASA Advanced Supercomputing Division NASA Ames Research Center Moffett Field CA USA

In the past two decades, numerous scheduling and load balancing techniques have been proposed for locally distributed multiprocessor systems. However they all suffer from significant deficiencies when extended to a Grid environment: some use a centralized approach that renders the algorithm unscalable, while others assume the overhead involved in searching for appropriate resources to be negligible. Furthermore, classical scheduling algorithms do not consider a Grid node to be N-resource rich and merely work towards maximizing the utilization of one of the resources. In this paper, we propose a new scheduling and load balancing algorithm for a generalized Grid model of N-resource nodes that not only takes into account the node and network heterogeneity, but also considers the overhead involved in coordinating among the nodes. Our algorithm is decentralized, scalable, and overlaps the node coordination time with that of the actual processing of ready jobs, thus saving valuable clock cycles needed for making decisions. The proposed algorithm is studied by conducting simulations using the Message Passing Interface (MPI) paradigm.

关键词： Load management Scheduling algorithm Multiprocessing systems Processor scheduling Resource management NASA Clocks computer science Computational modeling Message passing

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Enabling active flow manipulation in silicon-based network forwarding engines

Enabling active flow manipulation in silicon-based network f...

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DARPA Active Networks Conference and Exposition

作者： T. Lavian P. Wang F. Travostino S. Subramanian R. Duraraj Doan Hoang V. Sethaput D. Culler Candidate at the Computer Science Division University of California Berkeley USA Department of Computer Systems University of Technology University of California Sydney Australia Advanced Technology Nortel Networks Corp. Division of Engineering and Applied Sciences North Carolina State University USA Visiting research professor at Advanced Technology Nortel Networks Corporation Australia Computer Science Division University of California at Berkeley Nortel Networks Corp. Computer Science Division University of California Berkeley USA

A significant challenge arising from today's increasing Internet traffic is the ability to flexibly incorporate intelligent control in high performance commercial network devices. The paper tackles this challenge by introducing the active flow manipulation (AFM) mechanism to enhance traffic control intelligence of network devices through programmability. With AFM, customer network services can exercise active network control by identifying distinctive flows and applying specified actions to alter network behavior in real-time. These services are dynamically loaded through Openet by the CPU-based control unit of a network node and are closely coupled with its silicon-based forwarding engines, without negatively impacting forwarding performance. AFM is exposed as a key enabling technology of the programmable networking platform Openet. The effectiveness of our approach is demonstrated by four active network services on commercial network nodes.

关键词： Intelligent networks computer science IP networks Web and internet services Silicon Permission Read only memory Search engines Communication system traffic control

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Development of a variable emittance radiator based on a perovskite manganese oxide

Development of a variable emittance radiator based on a pero...

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8th AIAA/ASME Joint Thermophysics and Heat Transfer Conference 2002

作者： Tachikawa, Sumitaka Ohnishi, Akira Shimakawa, Yuichi Ochi, Atsushi Okamoto, Akira Nakamura, Yasuyuki The Institute of Space and Astronautical Science 3-1-1 Yoshinodai Sagamihara Kanagawa 229-8510 Japan NEC corporation 5-7-1 Shiba Minato Tokyo 108-8001 Japan NEC TOSHIBA Space Systems Ltd. 4035 Ikebe Tsuzuki Yokohama Kanagawa 224-8555 Japan Engineering Support Division Japan Center for Advanced Spacecraft Technology Japan Fundamental Research Laboratories Japan Functional Materials Research Laboratories Japan Mechanical Systems Department Japan

ISBN: (纸本)9781624101182

Two types of thermal control materials developed for space use are described. These new materials are a variable emittance radiator named the Smart Radiation Device (SRD). The SRD is based on La0.825Sr0.175MnO3 and La0.7Ca0.3MnO3, which is a thin and light ceramic tile. The material undergoes a metalinsulator transition at around room temperature and this allows the infrared emissivity of the device to change from low to high as the temperature is increased from 173K to 375K. This is beneficial for thermal control applications on spacecraft. For example, bonded only to the external surface of the spacecraft, the SRD controls the heat radiated to deep space without electrical instruments or mechanical parts. Its function is similar to the thermal louver, but the SRD is lighter. This new device reduces the energy consumption of the electrical heater for thermal control, and decreases the weight and the cost of the thermal control system. Optical properties, such as the total hemispherical emittance and the solar absorptance, have been measured. Space environmental simulation tests were performed with independent irradiation by protons, electrons and UV on the ground. Degradation of the materials is discussed in optical properties. © 2002 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Radiators

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Transition to Chaos in Continuous-Time Random Dynamical systems

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Physical Review Letters 2002年第12期88卷 124101-124101页

作者： Zonghua Liu Ying-Cheng Lai Lora Billings Ira B. Schwartz Department of Mathematics Center for Systems Science and Engineering Research Arizona State University Tempe Arizona 85287 Department of Electrical Engineering and Physics Arizona State University Tempe Arizona 85287 Department of Mathematical Sciences Montclair State University Upper Montclair New Jersey 07043 Special Project in Nonlinear Science Code 67003 Plasma Physics Division Naval Research Laboratory Washington D.C. 20375

We consider situations where, in a continuous-time dynamical system, a nonchaotic attractor coexists with a nonattracting chaotic saddle, as in a periodic window. Under the influence of noise, chaos can arise. We investigate the fundamental dynamical mechanism responsible for the transition and obtain a general scaling law for the largest Lyapunov exponent. A striking finding is that the topology of the flow is fundamentally disturbed after the onset of noisy chaos, and we point out that such a disturbance is due to changes in the number of unstable eigendirections along a continuous trajectory under the influence of noise.

关键词： Chaos theory

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Effective way to improve the response time of short term bursty TCP traffic

Effective way to improve the response time of short term bur...

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IEEE Conference on Vehicular Technology (VTC)

作者： Yu-Chul Kim Jung-Sung Kwan Min-Kyo In Yong-Jin Kim Dong-Ho Cho Communication and Information Systems Laboratory Department of Electrical Engineering& Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea Next Generation Intemet Standards Team Electronics and Telecommunications Research Institute ETRI Protowl Engineering Center Daejeon South Korea

In this paper, we propose a new algorithm that aids the recovery of lost packets by generating additional duplicate ACK. It is shown that by adopting this algorithm the response time and throughput of short term burst... 详细信息

关键词： Delay Degradation Telecommunication traffic Information systems computer science Telecommunication standards Bit error rate Wire Filters TCPIP

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Topology of the conceptual network of language

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Physical Review E 2002年第6期65卷 065102(R)-065102(R)页

作者： Adilson E. Motter Alessandro P. S. de Moura Ying-Cheng Lai Partha Dasgupta Department of Mathematics Center for Systems Science and Engineering Research Arizona State University Tempe Arizona 85287 Instituto de Física Universidade de São Paulo Caixa Postal 66318 05315-970 São Paulo Brazil Departments of Electrical Engineering and Physics Arizona State University Tempe Arizona 85287 Department of Computer Science and Engineering Arizona State University Tempe Arizona 85287

We define two words in a language to be connected if they express similar concepts. The network of connections among the many thousands of words that make up a language is important not only for the study of the structure and evolution of languages, but also for cognitive science. We study this issue quantitatively, by mapping out the conceptual network of the English language, with the connections being defined by the entries in a Thesaurus dictionary. We find that this network presents a small-world structure, with an amazingly small average shortest path, and appears to exhibit an asymptotic scale-free feature with algebraic connectivity distribution.

关键词： Large scale systems

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Cascaded ultrabright source of polarization-entangled photons

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Physical Review A 2002年第6期65卷 063805-063805页

作者： G. Bitton W. P. Grice J. Moreau L. Zhang Center for Engineering Science Advanced Research Computer Science and Mathematics Division Oak Ridge National Laboratory Oak Ridge United States Glucon Medical Ltd. K. Arye Petach-Tikva P.O. Box 3098 Israel Ecole supérieure de Physique et de Chimie Industrielle de la Ville de Paris 75005 Paris France Agiltron Corporation Winchester MA 01890 20 Arbor Lane United States

An ultrabright source of polarization-entangled photons has been realized using type-II phase matching in the spontaneous parametric down-conversion process in two cascaded crystals. The optical axes of the crystals are aligned in such a way that the extraordinarily (ordinarily) polarized cone from one crystal overlaps with the ordinarily (extraordinarily) polarized cone from the second crystal. This spatial overlapping removes the association between the polarization and the output angle of the photons that exists in a single type-II down-conversion process. Hence, entanglement of photon pairs originating from any conjugate points on the output cones is possible if a suitable optical delay line is used. This delay line is particularly simple and easy to implement.

关键词： Quantum theory

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Spectral and spatial parameterization of multi-date satellite images for change detection of linear features

Spectral and spatial parameterization of multi-date satellit...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： G. Avraham M. Shoshany N.S. Netanyahu Environmental Information Laboratory Bar-llan University Ramat-Gan Israel Geodetic Engineering Division Faculty of Civil Engineering Technion-Israel Institute of Technology Haifa Israel Center of Automation Research University of Maryland College Park MD USA Department of Mathematics and Computer Science Bar-llan University Ramat-Gan Israel

A new technique utilizing combination of feature extraction by change vector analysis and analysis of distances between features allows improvement in change detection of linear features such as roads and water channels. The technique reduces false detection of changes due to image calibration differences, illumination differences and misregistration. The method was applied to areas of steep climatic gradient between Mediterranean and extreme desert regions.

关键词： Satellites Image analysis Remote sensing computer vision Vectors Information analysis Roads Calibration Convolution Pixel

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