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检索条件"任意字段=Proceedings of the 1997 Conference on Java in Science and Engineering Simulation"

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Design procedure and performance evaluations of utility-interactive bidirectional resonant DC link three phase ZVS-PWM power conditioner

Design procedure and performance evaluations of utility-inte...

引用

Power Conversion conference

作者： T. Shimizu M. Kurokawa Y. Matsumoto A. Chibani M. Nakaoka The Graduate School of Engineering and Science Yamaguchi University Ube Yamaguchi Japan

This paper describes an operating principle and features of a newly-developed parallel resonant DC link circuit with an active voltage clamped PWM control scheme. In particular, a new conceptual design procedure of the resonant DC link treated here is illustrated and discussed including a practical design example under zero voltage and zero current soft switching. In this paper, a bidirectional power flow three-phase voltage-fed PWM power converter using a resonant DC link which is applied to a utility-interfaced battery energy storage system is analyzed for load leveling, battery charging, reactive current compensation and active filtering schemes. Finally, the system performances of this converter mode or inverter mode and the effectiveness of this resonant DC link circuit topology and resonant DC link power processor are demonstrated on the basis of simulation results.

关键词： Resonance Pulse width modulation Batteries RLC circuits Voltage control Zero voltage switching Bidirectional power flow Pulse width modulation converters Energy storage Load flow analysis

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Performance and fairness comparison between EFCI and ERF flow control schemes for the ABR service in ATM networks

Performance and fairness comparison between EFCI and ERF flo...

引用

IEEE International conference on Communications (ICC)

作者： M. Zukerman P.W. Tse Department of Electrical & Electronic Engineering University of Melbourne VIC Australia Department of Computer Science Monash University VIC Australia

In this paper we compare, by simulation based on real traffic traces, the EFCI (explicit forward congestion indication) and the ERF (explicit rate feedback) rate-based flow control algorithms for the available bit rate (ABR) service in ATM networks. The factors under consideration are: (1) distance from source to destination and (2) rate of resource management (RM) cells. Although no significant fairness throughput problem has been identified in both EFCI and ERF, sources with high end-to-end propagation delay will experience higher queueing delay and loss probability. In this paper, we have also shown that although EFCI can lead to considerably lower utilisation than ERF if the parameters are set arbitrarily, it can perform as good as or close to ERF if there were complementary software which can compute the optimal parameters for EFCI based on the on-line measurement of traffic streams.

关键词： Traffic control Propagation delay Communication system traffic control Feedback Bit rate Resource management Throughput Propagation losses Performance evaluation Software performance

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A new multiuser detector for optical code division multiple access communications systems

A new multiuser detector for optical code division multiple ...

引用

IEEE International conference on Communications (ICC)

作者： J.T.K. Tang K.B. Letaief Electrical and Electronic Engineering Department Hong Kong University of Science and Technology Hong Kong China

Optical code division multiple access has been proposed as an alternative multiple access scheme for multiuser fiber-optic communication systems. Many previous works on the receivers for such systems have focused on the correlation receiver which is optimal in the single user case. However, it has been shown that the performance of the correlation receiver is unsatisfactory when there is a large number of interferers. Multiuser detection becomes an appealing method to improve the system performance. In this paper, a new multiuser detector for optical code division multiple access communication systems, referred to as the multistage decorrelating receiver, is proposed. Its structure is much simpler than the optimal multiuser detector at the expense of slight performance degradation. Both simulation and analysis of the receiver are carried out. Comparison of the proposed detector with several other receivers is also presented.

关键词： Optical detectors Multiaccess communication Optical receivers Multiple access interference Decorrelation Optical fiber communication Multiuser detection Degradation Spread spectrum communication Intensity modulation

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Force propagation models in laparoscopic tools and trainers

Force propagation models in laparoscopic tools and trainers

引用

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

作者： S. Payandeh Experimental Robotics Laboratory (ERL) School of Engineering Science Simon Fraser University Burnaby BC Canada

Most of the tools that are used in performing manipulation tasks in laparoscopic surgery are graspers and needle drivers. Although the operation of such basic tools is rather simple, their combination with remote access to the surgical site and an indirect field of view makes the usage of such mechanisms challenging. This means that surgeons have to undergo a series of training sessions in order to gain proper hand/eye coordination. In addition, due to the structure of these mechanisms, the sense of touch has been reduced to a minimum. One challenge of research and development has been to design a force-reflective grasper that can reflect the sense of touch back into the handle. In addition, considerable efforts are being focused on developing a virtual laparoscopic trainer where the sense of touch in manipulating virtual tissues and organs can be reflected back to the hand of the surgeon through the proper design of haptic interfaces. This paper presents force propagation models which can be used in the modelling, design and interpretation of the force sensing system and reflecting devices. The proposed models agree with the experimental observation previously published in the literature for describing the relationships between the magnitude of the grasping force and the applied force at the handle.

关键词： Laparoscopes Grasping Force measurement Haptic interfaces Computational modeling Kinematics Minimally invasive surgery Needles Computer simulation Robots

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Performance of alternate routing methods in all-optical switching networks

Performance of alternate routing methods in all-optical swit...

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IEEE Annual Joint conference: INFOCOM, IEEE Computer and Communications Societies

作者： H. Harai M. Murata H. Miyahara Department of informatics and Mathematical Science Graduate School of Engineering Science Osaka University Toyonaka Osaka Japan

We study routing methods in all-optical switching networks. In all-optical switching networks, the connection with more hops encounters more call blocking, and it is especially true in optical networks with no wavelength conversions. We therefore consider an alternate routing method with limited trunk reservation in which connections with more hops are prepared more alternate routes. Through developing an approximate analytic approach, we show that our method keeps good performance when compared with the existing alternate routing methods, and also that the fairness among connections can be improved. Further performance improvement is investigated by introducing a wavelength assignment policy and a dynamic routing method. An effectiveness of the proposed method is investigated through simulation.

关键词： Intelligent networks Optical wavelength conversion Optical fiber networks High speed optical techniques Stimulated emission Wavelength routing Degradation Communication switching Informatics Wavelength assignment

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Application-driven synthesis of core-based systems 97

Application-driven synthesis of core-based systems

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proceedings of the 1997 IEEE/ACM international conference on Computer-aided design

作者： Darko Kirovski Chunho Lee Miodrag Potkonjak William Mangione-Smith Computer Science Department University of California Los Angeles CA Electrical Engineering Department University of California Los Angeles CA

ISBN: (纸本)9780818682001

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： application-specific system-level synthesis system modeling and performance evaluation cache line coloring

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Optimal loop bandwidth design for low noise PLL applications

Optimal loop bandwidth design for low noise PLL applications

引用

Asia and South Pacific Design Automation conference

作者： Kyoohyun Lim Seunghee Choi Beomsup Kim Department of Electrical Engineering Korea Advanced Institute of Science and Technology Taejon South Korea Techno-Economics Department Electronics and Telecommnications Research Institute Taejon South Korea

ISBN: (纸本)0780336623

This paper presents a salient method to find an optimal bandwidth for low noise phase-locked loop (PLL) applications by analyzing a discrete-time model of charge-pump PLLs based on ring oscillator VCOs. The analysis shows that the timing jitter of the PLL system depends on the jitter in the ring oscillator and an accumulation factor which is inversely proportional to the bandwidth of the PLL. Further analysis shows that the timing jitter of the PLL system, however, proportionally depends on the bandwidth of tile PLL when an external jitter source is applied. The analysis of the PLL timing jitter of both cases gives the clue to the optimal bandwidth design for low noise PLL applications. simulation results using a C-language PLL model are compared with the theoretical predictions and show good agreement.

关键词： Bandwidth Phase locked loops Clocks Phase noise Circuits Voltage-controlled oscillators Working environment noise Timing jitter Noise reduction Data mining

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Centralized failure injection for distributed, fault-tolerant protocol testing

Centralized failure injection for distributed, fault-toleran...

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International conference on Distributed Computing Systems

作者： G.A. Alvarez F. Cristian Department of Computer Science and Engineering University of California San Diego USA

We describe a centralized approach to testing that distributed fault-tolerant protocols satisfy their safety and timeliness specifications in the presence of the very failures they are designed to tolerate. CESIUM is a testing environment based on the centralized simulation of distributed executions and failures. Processes are run in a single address space while providing the appearance of a truly distributed execution. The human tester can force the occurrence of arbitrary failures and security attacks. The implementations under test are not instrumented for testing purposes, and their source codes need not be available. We prove that CESIUM can execute exactly the set of runs feasible in the real distributed system being simulated. We also show that there are safety and timeliness properties in the specifications of many existing distributed protocols that cannot be tested in practical distributed systems. All of these properties can, however, be accurately tested by CESIUM without introducing any perturbation in test experiments.

关键词： Fault tolerance Protocols System testing Clocks Safety Vehicle crash testing Humans Security Instruments Delay

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Recovery in a shared disk parallel database system using DFeRAM

Recovery in a shared disk parallel database system using DFe...

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International conference on High Performance Computing in the Asia-Pacific Region

作者： Yong Keol Kim Young Sik Baek Seong II Jin Sung Hyun Cho Department of Office Automation Taejon Medical Junior College South Korea System Technology Section Electronics and Telecommunications Research Institute South Korea Department of Computer Science Chungnam National University South Korea Division of Electronics and Computer Engineering Hongik University South Korea

A nonvolatile memory called FeRAM (Ferroelectronic Random Access Memory) is one of the promising memory devices. This paper presents a dual plane FeRAM (DFeRAM) architecture for recovery in the shared disk parallel database system. This paper also presents a recovery algorithm based on a shadow paging method using a DFeRAM architecture. We compare the performance of the log based method and that of our method based on simulation results, which show that our method is better than the log based method when both methods use a nonvolatile memory.

关键词： Database systems Nonvolatile memory Random access memory Ferroelectric films Transaction databases Object oriented modeling Maintenance Discrete event simulation Communication system control Flash memory

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New low loss quasi-parallel resonant DC-link inverter with lossless variable zero voltage duration

New low loss quasi-parallel resonant DC-link inverter with l...

引用

International conference on Industrial Electronics, Control and Instrumentation

作者： Kyung-Ahn Kwon K.H. Kim Yong-Chae Jung Mignon Park The Department of Electronic Engineering Yonsei University Seoul South Korea Living System Research Laboratory LG Electronics Inc. Seoul South Korea Korea Institute of Science and Technology South Korea Living System Research Lab LG Electronics Inc. Seoul South Korea The Department of Electronic Engineering Yonsei University South Korea

A new low loss quasi-parallel resonant DC-link (NLQPRDCL) inverter which shows highly improved PWM capability, low loss characteristic and low voltage stress is presented. A method to minimize freewheeling interval, which is able to largely decrease DC-link operation losses and to steadily guarantee soft switching in the wide operation region is proposed. In addition, lossless control of zero voltage duration of the DC-link makes the proposed inverter maintain the advanced PWM capability even under a very low modulation index. simulation and experiment are performed to verify the validity of the proposed inverter.

关键词： Resonance Pulse width modulation inverters Inductors Stress Capacitors Pulse width modulation Voltage control Topology Zero voltage switching Circuits

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