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DO-WF2Q: Delay-optimised WF2Q packet scheduling

DO-WF2Q: Delay-optimised WF2Q packet scheduling

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作者： Fei, X. Marshall, A. Luo, J. Advanced Telecommunications Systems Lab. School of Electrical and Electronic Engineering Queen's University of Belfast United Kingdom Computer Communications and Networks Group Department of Computer Science and Engineering Southeast University China

Packet scheduling is an essential element of any QoS enabled packet-switched network. (QoS provisioning and packet scheduling play important roles in present and future Internet applications.) In terms of packet fair queueing, worst case fair WFQ (WF2Q) is better than weighted fair queueing (WFQ) in that it can provide a bounded worst-case fairness index (WFI). The delay property of these two queueing schemes are studied. To do this, the delay index (DI) and the worst-case delay index (WDI) are defined to measure the discrepancy between the delay using these queueing schemes and that obtained using generalised processor sharing (GPS). Simulations show that in some circumstances WF2Q has higher DI than that using WFQ. The reason why WF2Q sometimes experiences higher DI is analysed, and based on this, an adaptive packet queueing algorithm termed delay-optimised WF2Q (DO-WF2Q) is proposed. This algorithm aims to improve the delay index (DI) while maintaining the WFI bound provided by WF2Q. Verifications and simulations show that DO-WF2Q can reduce the DI while maintaining the WFI bound, and at the same time retaining the same complexity as WF2Q. © IEE, 2005.

关键词： Packet networks

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Communication strategies for shared-bus embedded multiprocessors

Communication strategies for shared-bus embedded multiproces...

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5th ACM International Conference on Embedded Software, EMSOFT 2005

作者： Bambha, Neal K. Bhattacharyya, Shuvra S. US Army Research Lab. Adelphi MD United States Dept. of Electrical and Computer Engineering Institute for Advanced Computer Studies University of Maryland College Park United States

ISBN: (纸本)1595930914

This paper explores the problem of efficiently ordering inter-processor communication operations in both statically and dynamically-scheduled multiprocessors for iterative dataflow graphs with probabilistic execution times. In most digital signal processing applications, the throughput of the system is significantly affected by communication costs. We explicitly model these costs within an effective graph-theoretic analysis framework. We show that ordered transaction schedules can significantly outperform both self-timed schedules and dynamic schedules for moderate task execution time variability. As the task execution time variability increases, we show that first self-timed and then dynamic scheduling policies are preferred. We perform an extensive experimental comparison on both real and simulated benchmarks to gauge the effect of synchronization and communication over-head costs on these crossover points. Copyright 2005 ACM.

关键词： Communication systems

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Performance characterization of IP network-based control methodologies for DC motor applications - Part I

Performance characterization of IP network-based control met...

引用

IECON 2005: 31st Annual Conference of IEEE Industrial Electronics Society

作者： Richards, Tyler Chow, Mo-Yuen Advanced Diagnosis Automation and Control Lab. Department of Electrical and Computer Engineering North Carolina State University Raleigh NC 27695 United States

ISBN: (纸本)0780392523

Using a communication network, such as an IP network, in the control loop is increasingly becoming the norm. This process of network-based control (NBC) has a potentially profound impact in areas such as: teleoperation, healthcare, military applications, and manufacturing. However, limitations arise as the communication network introduces delay that often degrades or destabilizes the control system. Four methods have been investigated that alleviate the IP network delays to provide stable real-time control. This paper presents the four methodologies, while the companion paper presents a case study on a DC motor with a networked proportional-integral (PI) speed controller with various network delays and noise levels. The four methodologies are gain scheduling middleware (GSM), optimal stochastic methodology, queuing methodology, and robust control methodology. Simulation results show that NBC combined with these techniques can successfully maintain system stability, allowing control of real-time applications. ©2005 IEEE.

关键词： Control systems

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Design and implementation of open MPI over Quadrics/Elan4

Design and implementation of open MPI over Quadrics/Elan4

引用

19th IEEE International Parallel and Distributed Processing Symposium, IPDPS 2005

作者： Yu, Weikuan Woodall, Tim S. Graham, Rich L. Panda, Dhabaleswar K. Network-Based Computing Lab. Dept. of Computer Sci. and Engineering Ohio State University Advanced Computing Laboratory Computer and Computation Sci. Division Los Alamos National Laboratory

ISBN: (纸本)0769523129

Open MPI is a project recently initiated to provide a fault-tolerant, multi-network capable implementation of MPI-2 [16], based on experiences gained from FT-MP1 [7], LA-MPI [10], LAM/MPI [23], and MVAPICH [18] projects. Its initial communication architecture is layered on top of TCP/IP. In this paper, we have designed and implemented Open MPI point-to-point layer on top of a high-end interconnect, Quadrics/Elan4 [21]. The restriction of Quadrics static process model has been overcome to accommodate the requirement of MPI-2 dynamic process management. Quadrics Queued-based Direct Memory Access (QDMA) and Remote Direct Memory Access (RDMA) mechanisms have been integrated to form a low-overhead, high-performance transport layer. Light-weight asynchronous progress is made possible with a combination of Quadrics chained event and QDMA mechanisms. Experimental results indicate that the resulting point-to-point transport layer is able to achieve comparable performance to Quadrics native QDMA operations, from which it is derived. Our implementation provides an MPI-2 compliant message passing library over Quadrics/Elan4 with a performance comparable to MPICH-Quadrics.

关键词： Multiprocessing systems

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Formal verification of robot movements - A case study on home service robot SHR100

Formal verification of robot movements - A case study on hom...

引用

2005 IEEE International Conference on Robotics and Automation

作者： Kim, Moonzoo Kang, Kyo Chul Lee, Hyoungki Computer Science and Engineering Department Pohang University of Science and Technology Pohang Korea Republic of Interaction Lab. Samsung Advanced Institute of Technology Suwon Korea Republic of

ISBN: (纸本)078038914X

Home service robots have received much attention from both academia and industry because home service robots have wide range of potential applications such as home security, cleaning, etc. The robots need to add or update services frequently according to the changing needs of human users. Furthermore, reactive nature of the robots add complexity to develop robot applications. These challenges raise safety issues seriously. Considering that safe operation of home service robots is crucial, current practice of validating robot applications is, however, not mature enough for wide deployment of home service robots. In this paper, we present our experience of developing and formally verifying discrete control software of Samsung Home Robot (SHR) using Esterel. We give a brief background on Esterel, then illuminate our result in formally verifying stopping behavior of SHR. Through the verification, we could detect and solve a feature interaction problem which caused the robot not to stop when a user commanded the robot to stop. © 2005 IEEE.

关键词： Motion planning

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Performance of adaptive precoding for wireless MIMO broadcast channels with limited feedback 62

Performance of adaptive precoding for wireless MIMO broadcas...

引用

62nd Vehicular Technology Conference, VTC 2005

作者： Kim, James S. Nam, Haewoon Kim, Hojin Department of Electrical and Computer Engineering Seoul National University Seoul Korea Republic of Department of Electrical and Computer Engineering University of Texas AustinTX78712 United States Communication and Network Lab. Samsung Advanced Institute of Technology Suwon Korea Republic of

ISBN: (纸本)0780391527

The capacity region of multiple-input multipleoutput (MIMO) broadcast channel (BC) has attracted considerable attention recently. The greedy block MMSE QR decomposition with dirty paper coding (greedy block MMSE-DP) scheme is a solution to achieves extremely close to channel capacity with limited feedback of channel state information at transmitter (CSIT). In this paper, we analysis the performance and consider the reconfigurable implementation of greedy block MMSE-DP. Numerical results indicate that the greedy block MMSE-DP approach significantly outperforms the TDMA-MIMO approach in terms of the system throughput even when a large amount of quantization error is added to the feedback information (e.g., when signal-to-quantization-error ratio (SER) values are 14, 10, and 6 dB). The scheme is shown to be appropriate for reconfigurable implementation. © 2005 IEEE.

关键词： Channel state information

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Analysis of movement detection process for IPv6 mobile nodes

引用

2nd International Workshop on Mobility Aware Technologies and Applications, MATA 2005

作者： Han, Youn-Hee Hwang, Seung-Hee Communication and Network Lab. Samsung Advanced Institute of Technology Yongin Kyungki-do Korea Republic of Department of Computer Science and Engineering Korea University Seoul Korea Republic of

ISBN: (纸本)3540294104

IETF Mobile IPv6 allows nodes to perform an IP handover without breaking their active sessions. In Mobile IPv6, after re-associating a new attachment of point, it is generally the responsibility of a mobile node to detect that it has moved to a new IP subnet. Determining whether or not a node has moved to a new IP subnet is not always a simple issue. In this paper, we analyze the movement detection process of IPv6 mobile nodes based on standards, i.e. IETF RFC documents and IETF Working Group Internet-drafts. We model the movement detection process and provide our results of performance analysis for the model in terms of latency caused by the process. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Mobile telecommunication systems

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Double side control of wound rotor induction machine for wind energy application employing half controlled converters

Double side control of wound rotor induction machine for win...

引用

2005 IEEE Industry Applications Conference, 40th IAS Annual Meeting

作者： Panda, Debiprasad Lipo, Thomas A. Rockwell Automation Advanced Technology Lab. Richmond Heights OH 44143 United States Department of Electrical and Computer Engineering University of Wisconsin Madison WI 53706 United States

ISBN: (纸本)0780392086

A double side converter fed wound rotor induction machine control for a wind energy application is proposed in this paper. In order to reduce the cost of a wind generator system, a new configuration using half controlled converters for both the stator and rotor circuit as well as for the line side is proposed. The proposed controller reduces the required KVA rating of both machine side and line side converters, improves the efficiency of the wind generator, helps operating over a wide speed range and supports near unity power factor interface with the grid. It is shown that the combined KVA rating of both the machine side converters are even less than that of the machine side converter for a conventional rotor side control configuration. Also, both stator and rotor side being connected to the grid through two power stages, the system will be least affected by the fault or disturbances in the gird. The proposed configuration is simulated for a 30kW wound rotor machine in SABER and the simulation results are presented. © 2005 IEEE.

关键词： Induction motors

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LRC-RED: A self-tuning robust and adaptive AQM scheme

LRC-RED: A self-tuning robust and adaptive AQM scheme

引用

6th International Conference on Parallel and Distributed Computing, Applications and Technologies, PDCAT 2005

作者： Xiong, Naixue Yang, Yan Défago, Xavier He, Yanxiang School of Information Science Japan Advanced Institute of Science and Technology 1-1 Asahidai Nomi Ishikawa Japan State Key Lab of Software Engineering Computer School Wuhan University China Computer School Wuhan University of Science and Technology China

ISBN: (纸本)0769524052

In this paper, we propose a novel active queue management (AQM) scheme based on the Random Early Detection (RED) of the loss ratio and the total sending rate control, called LRC-RED, to regulate the queue length with small variation and to achieve high utilization with small packet loss. This scheme measures the latest packet loss ratio, and uses it and the total sending rate as complements to queue length in order to dynamically adjust packet drop probability. Further, we also provide the design rules for this scheme based on the well-known TCP control model. On the basis of the design rules, we develop a simple, scalable and systematic rule for tuning the control parameters which can be adaptive to dynamic network conditions. Through ns 2 simulations, we show the faster response time and better robustness of the proposed LRC-RED as compared with the Loss Ratio based RED (LRED) [5] algorithm.

关键词： Adaptive systems

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A new approach for service-oriented architecture

A new approach for service-oriented architecture

引用

ITI International Conference on Information and Communications Technology (ICICT)

作者： A. Talaei-Khoei A.H. Sheriffian M.K. Akbari J.F. Verdom Advanced IT Development Lab Department of Computer Engineering and IT Amirkabir University of Technology슠 Iran

Service providing as an important activity in service-oriented architecture, which is the most popular architecture for applications of distributed environments needs a change to obtain better efficiency, so in this paper we present neighbor providing and extended neighbor providing (ENP) methods, which are apply the neighborhood computing in traditional methods. As evaluation of these methods we use the efficiency, scalability, and reliability metrics obtained from the results of omnet++ simulation and we measured the users' satisfactions with their opinions about the quality of implemented ENP system

关键词： Service oriented architecture Application software computer architecture Distributed computing Scalability Computational modeling Java Web sites Surges Information technology

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