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Creating a virtual network laboratory

Creating a virtual network laboratory

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IEEE International conference on Multimedia Computing and Systems (ICMCS)

作者： Yen-Jen Lee Wei-Hsiu Ma D.H.C. Du J.A. Schnepf Department of Computer Science University of Minnesota Minneapolis MN USA University of Minnesota Minneapolis MN US Department of Computer Science College of Saint Benedict and Saint John''s University Collegeville MI USA

Networking courses are traditionally conceptual in nature, with little opportunity for students to apply what they have learned in order to strengthen their knowledge. To support these courses, the University of Minnesota established a hands-on network laboratory. Educational and operational concerns have surfaced throughout the years due to the physical laboratory constraints and difficulty of satisfying the high demand. To address these issues, and to overcome the shortcomings of current approaches, we are developing a virtual network laboratory environment to eliminate most of the constraints, though it is not necessarily replacing all of the physical settings at once. The kernel consists of a collection of online multimedia learning modules which integrate the key laboratory devices with instructional material. The modules are designed to allow students to carry out hands-on networking in a virtual environment or through remote access. This virtual laboratory is easily accessible over the Internet.

关键词： Laboratories java Computer science Educational institutions Computer networks Space technology Consumer electronics Continuing education Maintenance engineering Bridges

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GABAc receptor model of retinal horizontal cells simulating emphasis of light-dark contrast

GABAc receptor model of retinal horizontal cells simulating ...

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Annual International conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： M. Mochizuki M. Kaneda A. Kaneko H. Minamitani Institute of Biomedical Engineering Faculty of Science and Technology Keio University Yokohama Kanagawa Japan Department of Physiology Keio University Shinjuku Tokyo Japan

We simulated the GABAc receptor model that has two functionally contrastive binding sites represented by Ca/sup 2+/ (facilitation) and Zn/sup 2+/ (inhibition) in the extracellular domain, and investigate the effect of GABAc receptors by extracellular Zn/sup 2+/. It was reported that Zn/sup 2+/ are colocalized with glutamatergic synaptic vesicles in photoreceptors in the light. We describe that the response of GABAc receptor is reduced by increasing the concentration of Zn/sup 2+/ caused by illumination and the modulatory action of Ca/sup 2+/ and Zn/sup 2+/ on GABAC receptor emphasis of contrast at a dark-light boundary.

关键词： Retina Extracellular Computational modeling Medical simulation Photoreceptors Voltage Computer simulation Biomedical engineering Physiology Electronic mail

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On incremental cache coherency schemes in mobile computing environments

On incremental cache coherency schemes in mobile computing e...

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International conference on Data engineering

作者： Jun Cai Kian-Lee Tan Beng Chin Ooi Department Information Systems and Computer Science National University of Singapore Singapore

ISBN: (纸本)0818678070

Re-examines the cache coherency problem in a mobile computing environment in the context of relational operations (i.e. selection, projection and join). We propose a taxonomy of cache coherency schemes, and as case studies, we pick several schemes for further study. These schemes are novel in several ways. First, they are incremental. Second, they are an integration of (and built on) techniques in view maintenance in centralized systems and cache invalidation in client-server computing environments. We conducted extensive studies based on a simulation model. Our study shows the effectiveness of these algorithms in reducing uplink transmission and average access times. Moreover, the class of algorithms that exploit collaboration between the client and server performs best in most cases. We also study extended versions of this class of algorithms to further cut down on the work performed by the server.

关键词： Mobile computing Taxonomy Computational modeling Collaborative work Bandwidth Partitioning algorithms Information systems Computer science Wireless communication Costs

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Multiobjective search based algorithms for circuit partitioning problem for acceleration of logic simulation

Multiobjective search based algorithms for circuit partition...

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International conference on VLSI Design

作者： S. Harikumer S. Kumar Dept. of Comput. Sci. & Eng. Indian Inst. of Technol. New Delhi India Department of Computer Science and Engineering Indian Institute of Technology New Delhi India

Speeding up logic simulation is important to reduce design time of complex systems. Hardware emulation through reconfigurable systems (RS) built using FPGA's offer an cheap and efficient method to achieve the required speed-up. Emulation through RS poses some unique problems because of the limited circuit and I/O resources. A preparatory step for emulation using RS is to partition the circuit into as few parts as possible satisfying the resource constraints. This paper presents multi-objective search based optimal and approximate algorithms for circuit partitioning for this purpose.

关键词： Partitioning algorithms Acceleration Logic circuits Circuit simulation Field programmable gate arrays Hardware Logic design Computational modeling Emulation Circuit testing

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Development of numerical integration methods for hybrid (discrete-continuous) dynamical systems

Development of numerical integration methods for hybrid (dis...

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IEEE/ASME (AIM) International conference on Advanced Intelligent Mechatronics

作者： T. Schlegl M. Buss G. Schmidt Institute of Automatic Control Engineering Technical University Munich Munich Germany

Summary form only given. When simulating hybrid discrete-continuous dynamical systems a key problem is the discontinuous model behavior. The state derivatives may change in a discontinuous way depending on the discrete state of the model. Conventional simulation algorithms are not suitable to integrate such hybrid system models with high accuracy and reasonable computational effort. In this paper we present results obtained with the simulation tool HYSIM we are developing. HYSIM can efficiently and accurately simulate hybrid systems including state and time events and sliding modes.

关键词： Mathematical model Computational modeling Discrete event simulation Computer languages State-space methods Control systems Automatic control Electronic mail World Wide Web Computer science

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Performance evaluation of unified power flow controller using transient simulation

Performance evaluation of unified power flow controller usin...

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International conference on Power Electronics and Drive Systems (PEDS)

作者： A.M. Kulkarni K.R. Padiyar Department of Electrical Engineering Indian Institute of Science Bangalore India

The unified power flow controller (UPFC) is a power electronic controller which can be used to control active and reactive power flows in a power transmission line the by injection of (variable) voltage in series and reactive current in shunt configuration. In this paper, the authors evaluate the performance of a control strategy for UPFC in which they control real power flow through a power line, while regulating the magnitudes of the voltages at its two ports using transient simulation. The real power reference is modulated in order to improve the damping of power swings in the line. The effectiveness of the UPFC with this control strategy is clearly brought out by the simulation study.

关键词： Load flow Voltage control Power system transients Electric variables control Power electronics Reactive power control Power transmission lines Power system reliability Power system stability Computational modeling

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Effect of pruning small weights in correlation associative memories

Effect of pruning small weights in correlation associative m...

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International conference on Neural Networks

作者： R. Kothari R. Lotlikar Artificial Neural Systems Laboratory Department of Electrical & Computer Engineering & Computer Science University of Cincinnati Cincinnati OH USA

In this paper we examine the effect of pruning small weights in correlation associative memories. The effect is investigated by considering a fully interconnected matrix and removing weights satisfying |w/sub ij/|/spl les//spl epsiv/. We show analytically that under suitable constraints on /spl epsiv/, the capacity of a sparsely connected associative memory is comparable to that of a fully connected one, without compromising the basins of attraction around the prototype fixed points. simulation results supporting the analysis are also presented.

关键词： Associative memory Neurons Neural networks Image storage Prototypes Laboratories Computer science Analytical models Image retrieval Image restoration

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Application-driven synthesis of core-based systems

Application-driven synthesis of core-based systems

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IEEE International conference on Computer-Aided Design

作者： Kirovski Lee Potkonjak Mangione-Smith Computer Science Department University of California Los Angeles CA USA Electrical Engineering Department University of California Los Angeles CA USA

We developed a new hierarchical modular approach for synthesis of area-minimal core-based data-intensive systems. The optimization approach employs a novel global least-constraining most-constrained heuristic to minimize the instruction cache misses for a given application, instruction cache size and organization. Based on this performance optimization technique, we constructed a strategy to search for a minimal area processor core, and an instruction and data cache which satisfy the performance characteristics of a set of target applications. The synthesis platform integrates the existing modeling, profiling, and simulation tools with the developed system-level synthesis tools. The effectiveness of the approach is demonstrated on a variety of modern real-life multimedia and communication applications.

关键词： Cache memories

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An incremental parallel tangent learning algorithm for artificial neural networks

An incremental parallel tangent learning algorithm for artif...

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Canadian conference on Electrical and Computer engineering (CCECE)

作者： A.R. Nezami V.C. Bhavsar A.A. Ghorbani Faculty of Computer Science University of New Brunswick Fredericton NB Canada Faculty of Computer Engineering Iran University of Science and Technology Tehran Iran

Ghorbani and Bhavasar (1993) proposed a modified backpropagation training algorithm using a deflecting gradient method-parallel tangent (Partan) gradient method-to accelerate convergence. We have also proposed the incremental inter-neuron communication method. In the incremental communication method, instead of communicating the full magnitude of the output value of a node, only the (reduced precision) increment or decrement to its previous value is sent on a communication link. In this paper, Partan is modified to incorporate incremental communication. The effects of the limited precision incremental communication method on the convergence behaviour and performance of the Partan backpropagation algorithm are investigated with the sonar problem discussed in literature. It is found through simulation that the communication costs during the training process decrease by a factor of 1.6. The application of the incremental reduced precision Partan method to larger networks is expected to result into even higher savings in communication costs.

关键词： Artificial neural networks Backpropagation algorithms Convergence Costs Gradient methods Sonar Optimization methods Acceleration Computer science Niobium

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Control of two-link flexible manipulator using disturbance observer with reaction torque feedback

Control of two-link flexible manipulator using disturbance o...

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International conference on Advanced Robotics (ICAR)

作者： Joono Cheong Wan-Kyan Chung Youngil Yoom Sang-rok Oh Robotics Laboratory School of Mechanical Engineering Pohang University of Science and Technology Pohang South Korea

ISBN: (纸本)0780341600

We propose a simple and easily implementable controller for a planar type two-link flexible manipulator. Due to the neat property of the disturbance observer, each flexible link can be considered as just two lumped masses with a spring between them, which is called a two-mass resonant model within the selected frequency range. For such a system, we design a controller which is simple to implement and robust for uncertainty using feedforward disturbance cancellation through the disturbance observer. The performance of the proposed method is verified by simulation and experiments.

关键词： Torque control Feedback Manipulator dynamics Resonance Control systems Springs Robust control Uncertainty Kinematics Books

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