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Guarantee of service expectation level and fairness by precise queue weight allocation in AF PHB

Guarantee of service expectation level and fairness by preci...

引用

IEEE Conference on Wireless Communications and Networking

作者： Sangkil Jung Sangjin Hong Mobile Systems Design Laboratory Department of Electrical and Computer Engineering Stony Brook University-SUNY Stony Brook NY USA

Assured forwarding per-hop behavior (AF PHB) is a forwarding scheme for providing QoS in DiffServ networks. It defines four classes and three drop precedence, where buffer space and bandwidth are defined as forwarding resources for each AF class (J. Heinanen et al., 1999). RIO (D.D. Clark and W. Fang, 1998) could be used as drop policy in a DiffServ router. AF PHB could be implemented by WRR, WFQ, CBQ, etc. When network managers provide AF PHB using the scheduling mechanisms, they want to guarantee accurate achievement of service expectation level, which results from precise queue weight allocation to each AF class with respect to forwarding resources, i.e., buffer space and bandwidth. In order to provide a guideline for the precise queue weight allocation, this paper proposes a simple analytical model for AF PHB designed on RIO and M/M/1 queue, and uses this model to obtain queue weight equation (QWE), which performs fine calculation of queue weight for AF classes. Average buffer space and bandwidth allocated for each AF class are used in derivation of QWE. The model verification is performed by simulation in which we use WRR for simplicity. Simulation results show that the QWE supports an accurate allocation of the forwarding resources, and, as a result, makes four AF classes achieve fairness as well as service expectation levels

关键词： Bandwidth Queueing analysis Resource management Quality of service Diffserv networks Mobile computing Laboratories computer networks design engineering Guidelines

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VoMESH: voice over wireless MESH networks

VoMESH: voice over wireless MESH networks

引用

IEEE Conference on Wireless Communications and Networking

作者： Kyungtae Kim Sangjin Hong Mobile Systems Design Laboratory Department of Electrical and Computer Engineering Stony Brook University-SUNY Stony Brook NY USA

In this work, we focus on increasing network utilization to support real-time applications, especially voice over IP, in 802.11b wireless mesh network. For increasing capacity, we investigate on two directions: use of packet aggregation and utilize of header compression. Although aggregation reduces 802.11 MAC overhead, it also increases delay. We present a distributed multihop aggregation algorithm that uses the "natural" waiting time in the interface queue of packets in a loaded network. Header compression can relax the VoIP protocol overhead, but it also introduces the signaling overhead. In our work, we propose a zero-length header compression algorithm integrated with packet aggregation, which doesn't need to depend on the signaling mechanism to recover the context discrepancy between compressor and decompressor. The above performance optimization techniques are experimented in the NS2 simulator. The experimental results show an increase of 12 times for a six hop string when all optimizations are used

关键词： Wireless mesh networks Internet telephony Protocols Mesh networks Costs Delay Spread spectrum communication Telecommunication traffic Traffic control Communication system security

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A new structure for capacitor-mismatch-insentive multiply-by-two amplification

A new structure for capacitor-mismatch-insentive multiply-by...

引用

ISCAS 2006: 2006 IEEE International Symposium on Circuits and systems

作者： Zare-Hoseini, Hashem Shoaei, Omid Kale, Izzet Applied DSP and VLSI Research Group Department of Electronic Systems University of Westminster London Applied DSP and VLSI Research Centre Eastern Mediterranean University KKTC Mersin 10 Gazimagusa IC Design Laboratory Electrical and Computer Engineering Department University of Tehran Tehran Iran

ISBN: (纸本)0780393902

A new approach to achieve a switched-capacitor multiply-by-two gain-stage with reduced sensitivity to capacitors' mismatches is presented in this paper. It is based on sampling fully differential input signals onto both plates of the input capacitors rather than sampling onto one plate of the capacitors with the other tied to a reference. It uses one operational amplifier (op-amp) in two phases to produce the gain of two (×2). Comparing to the conventional multiply-bytwo gain-stage, the mismatches between the capacitors has a much smaller influence on the accuracy of the gain of two (×2). Analytical and circuit-level analysis of the architecture and the conventional structure are presented using a generic 0.35μm CMOS technology. © 2006 IEEE.

关键词： Capacitors

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design of Compliant MEMS Grippers for Micro-Assembly Tasks

Design of Compliant MEMS Grippers for Micro-Assembly Tasks

引用

2006 IEEE/RSJ International Conference on Intelligent Robots and systems

作者： Byoung Hun Kang John T. Wen Department of Mechanical Design Engineering Korea Polytechnic University Kyunggi South Korea Mechanical AeroSpace and Nuclear Engineering Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

Due to their monolithic construction and superior wear and loss properties, flexure joints have been used to reduce the mechanism size and increase the positioning accuracy. The compliance of flexure joints, however, can affect the static and dynamic characteristics of the overall mechanism. To design mechanisms containing flexure joints, we have proposed a multi-objective optimization approach to take into account the multitude of performance metrics and design constraints. A Pareto frontier is first computed, and secondary design criteria, such as sensitivity and dynamic characteristics, are then applied to select the final design. To reduce the computation load and facilitate design iteration, a lumped spring approximation, the Paros-Weisbord model, is used to characterize the flexure joints and the pseudo-rigid-body model is used as an approximate description of mechanisms. This paper presents this approach applied to the design of a micro-gripper. The performance metrics are chosen to be the manipulability of the gripper opening and the decoupling of a stiffness matrix (reflecting the remote center of compliance criterion). Different design and initial fabrication results are included

关键词： Micromechanical devices Grippers design optimization Topology Stress design engineering Fabrication Assembly Aerodynamics Measurement

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Scalability Evaluation of a Hybrid Routing Architecture for Multi-FPGA systems

Scalability Evaluation of a Hybrid Routing Architecture for ...

引用

International Conference on Microelectronics, ICM

作者： Mohammed A. S. Khalid Viktor Salitrennik Department of Electrical and Computer Engineering University of Windsor Windsor ONT Canada Cadence Design Systems Inc. San Jose CA USA

Multi-FPGA systems (MFSs) are used as custom computing machines, logic emulators, and rapid prototyping vehicles. A key aspect of these systems is their programmable routing architecture which is the manner in which wires, FPGAs, and Field-Programmable Interconnect Devices (FPIDs) are connected. Several routing architectures for MFSs have been proposed and previous research has shown that the partial crossbar is one of the best existing architectures. A new routing architecture, called the Hybrid Complete-Graph and Partial- Crossbar (HCGP), was proposed by Khalid and was shown to provide superior speed and cost compared to partial crossbar. In this paper we address the issue of scalability of the HCGP routing architecture. The motivation for this work was to evaluate the suitability of the HCGP architecture for a future rapid prototyping system product that was being developed at Cadence. Experimental results show that the HCGP architecture is scalable and can be used with the state-of-the-art, high gate count FPGAs.

关键词： Scalability Routing Field programmable gate arrays computer architecture Costs Switches Prototypes Integrated circuit interconnections Wires Reconfigurable logic

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Latency Insertion Method with Frequency Dependent Effect

Latency Insertion Method with Frequency Dependent Effect

引用

Electronics System-Integration Technology Conference, ESTC

作者： Z. Deng J. Schutt-Aine J. Tan C. Kumar D. Milosevic Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign Urbana IL USA Cadence Design Systems Inc. Chelmsford MA USA

This paper presents an extension of the latency insertion method (LIM) to the treatment of circuits with frequency-dependent parameters. In particular, the skin effect of conductors is modeled in the formulation and t... 详细信息

关键词： Delay Frequency dependence Skin effect Conductors Circuit simulation Voltage Finite difference methods Time domain analysis Space technology Dielectric losses

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Modular-Based Classifier for Phoneme Recognition

Modular-Based Classifier for Phoneme Recognition

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IEEE International Symposium on Signal Processing and Information Technology (ISSPIT)

作者： Abbas Ahmadi Fakhri Karray Mohamed Kamel Systems Design Engineering Department Pattern Analysis and Machine Intelligence Laboratory Waterloo ONT Canada Electrical and Computer Engineering Department Pattern Analysis and Machine Intelligence Laboratory Waterloo ONT Canada

This paper proposes a modular-based classifier for the problem of phoneme recognition. This is carried out by the use of a two-level classification approach including, high and low levels. We propose a new concept called phoneme family. To obtain phoneme families, we employ k-mean clustering method. A given unknown phoneme is first classified into a phoneme family at high level classification. Then, the exact label of the phoneme is determined at low level classification. We have used a combined framework of statistical and neural network based classifiers. Encouraging results are obtained by applying the proposed method on TIMIT database and its performance is compared against other methods

关键词： Neural networks Speech recognition Recurrent neural networks Pattern recognition design engineering Databases Network topology Signal processing Information technology Pattern analysis

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Opposition-based Q(λ) algorithm

Opposition-based Q(λ) algorithm

引用

International Joint Conference on Neural Networks 2006, IJCNN '06

作者： Shokri, Maryam Tizhoosh, Hamid R. Kamel, Mohamed Pattern Analysis and Machine Intelligence Laboratory Department of Systems Design Engineering University of Waterloo 200 University Avenue West ON N2L 3G1 Canada Pattern Analysis and Machine Intelligence Laboratory Department of Electrical and Computer Engineering University of Waterloo 200 University Avenue West ON N2L 3G1 Canada

ISBN: (纸本)0780394909

The problem of delayed reward in reinforcement learning is usually tackled by implementing the mechanism of eligibility traces. In this paper we introduce an extension of eligibility traces to solve one of the challenging problems in reinforcement learning. The concept of opposition traces is proposed in this work to deal with large state space problems in reinforcement learning applications. We combine the idea of opposition and eligibility traces to construct the oppositionbased Q(λ). The results are compared with the conventional Watkins' Q(λ) and reflect a remarkable performance increase. © 2006 IEEE.

关键词： Reinforcement learning

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Evaluating Cisco e-learning Courses Modified for the Vision Impaired

Evaluating Cisco e-learning Courses Modified for the Vision ...

引用

International Conference on Information Technology Based Higher Education and Training, ITHET

作者： Helen L. Armstrong Iain D. Murray Ruchi R. Permvattana School of Information Systems Curtin University of Technology Australia Department Electrical & Computer Engineering Curtin University research into multimodal HCI Australia Research Associate with the Department Electrical & Computer Engineering research in the design of on-line environments for the vision impaired Curtin University of Technology Australia

The needs of vision impaired students are quite different to sighted students. The increasing use of e-learning means higher education must move to multi-modal user interfaces in order to make e-learning materials accessible to all students. E-Learning materials (particularly in the sciences and technology) are predominantly visual, presented via computer keyboard and screen. Software and devices designed to aid the vision impaired are unable to decipher most images and visual- centric objects contained in e-learning materials. This paper discusses a project undertaken over the past two years to modify the content and presentation of Cisco certification e-learning courses to enable accessibility by vision impaired and blind students. These modifications necessitated rewriting the learning materials so they could be effectively presented via multi-modal user interfaces to vision impaired students, involving speech, audio, haptics and force-feed devices and methods. Evaluation of sections of the project by the vision impaired students using a model based upon Stufflebeam's CIPP model and Kirkpatrick's Four-Level training program evaluation model has been carried out and the results are presented.

关键词： Electronic learning User interfaces Educational programs computer science education computer vision Graphics Face detection Materials science and technology Keyboards Software design

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On the reliability issues of RF CMOS devices

On the reliability issues of RF CMOS devices

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ICSICT-2006: 2006 8th International Conference on Solid-State and Integrated Circuit Technology

作者： Wong, Hei Fu, Yue Liou, J.J. Yue, Yun Iwai, Hiroshi Dept. of Electronic Engineering City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong Frontier Collaborative Research Center Tokyo Institute of Technology Nagatsuta Yokohama 226-8502 Japan Department of Electrical and Computer Engineering University of Central Florida Orlando FL 32816 United States RF/MS Design Group Conexant Systems Palm Bay FL 32905 United States

ISBN: (纸本)1424401615

Although multi-finger MOS structures have demonstrated very attractive behaviors for high-frequency analog circuit applications, the shared drain and source regions for adjacent gate fingers have led to current crowding and results in the finger number-dependent current-voltage characteristics. In addition, the high current density spots near the drain region would deteriorate the MOS reliability in several aspects. Present results suggest that the common drain regions should be wider and more heavily doped in order to alleviate these effects. © 2006 IEEE.

关键词： CMOS integrated circuits

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