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Performance improvements of data-link layer protocol in WATM

Performance improvements of data-link layer protocol in WATM

引用

IEEE International Conference on Communications (ICC)

作者： Sungchun Park Sungwon Lee Young-Jae Song Dong-Ho Cho Yong-Bae Dhong Technical research and Development Korea Data Communications KDC Corporation Anyang South Korea IMT-2000 system developmmt group Samsung Electronics Company Limited South Korea Department of Computer Engineering Kyung Hee University South Korea Department of Electrical Engineering Korea Advanced Institute of Science and Technology South Korea Korea Electronics and Technology Institute South Korea

In these days, a mobile communication service has high-speed and multimedia characteristics. Due to the high error ratio of wireless link environments, a DLC protocol that is optimized for a wire network could not be used in wireless link environments. Thus, the DLC protocol that is suitable for mobile communication environments is required. To solve these problems, we propose an efficient WATM DLC layer protocol. The proposed DLC protocol could support various traffic attributes of high-speed multimedia services. That is, the proposed DLC layer protocol provides a piggyback response, the multiple-ack, and a multiple retransmission mechanism based on SR-ARQ. Also, an outband retransmission scheme using dynamic bandwidth is provided for the delay sensitive service and multi-copy transmission is applied in seriously faded radio environments such as handover. According to the simulation results, the suggested schemes show a better performance than the conventional SR-ARQ protocol in view of the cell transmission delay and throughput.

关键词： Wireless application protocol Delay Forward error correction Data communication Throughput Wireless sensor networks Automatic repeat request Mobile communication Error correction Testing

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Electromagnetic field characteristics of radial line slot antennas for surface wave coupled plasma production

Electromagnetic field characteristics of radial line slot an...

引用

Antennas and Propagation Society International Symposium

作者： T. Yamamoto M. Ono M. Ando N. Goto N. Ishii Y. Yasaka Department of Electrical Engineering and Computer Sci. Faculty of Eng Yamagata University Yonezawa Yamagata Japan Department of Electrical and Electronic Engineering Faculty of Eng Tokyo Institute of Technology Meguro Tokyo Japan Department of Electronics and System Faculty of Engineering Takushoku University Hachioji Tokyo Japan Corporate R&D Central Research Laboratory Tokyo Electron Limited Nirasaki Yamanashi Japan

In plasma processing systems for large sized wafer, quick evacuation of reaction gas by making the process space gap narrow is required to realize higher productivity and better quality of microelectronic devices. The wafer must be placed closely to the antenna aperture in this case. A radial line slot antenna (RLSA) for surface wave coupled plasma (SWP) is a promising candidate to this end. A novel slot arrangement in the aperture, which consists of densely arrayed transverse slots, was fabricated and tested. A uniform, high electron density of 3/spl times/10/sup 11/ cm/sup -3/ and large-area plasma under the condition of low electron temperature has already been realized by experiments. It dispenses with DC magnetic fields required in ECR systems. For further development of slot design as well as the mechanism extraction of plasma generation, this paper evaluates the electromagnetic near fields of SWP RLSAs. As the first step, antennas in free space without the plasma as well as the glass vacuum window, is analyzed using the periodic array model. The predicted near field distribution is compared with the experiments and reasonable agreement is reported.

关键词： Electromagnetic fields Slot antennas Plasma temperature Plasma devices Apertures Plasma density Plasma waves Electrons Plasma properties Plasma materials processing

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RAPTOR: A single chip multiprocessor 1

RAPTOR: A single chip multiprocessor

引用

1st IEEE Asia Pacific Conference on ASICs, AP-ASIC 1999

作者： Lee, Sang-Won Song, Yun-Seob Kim, Soo-Won Oh, Hyeong-Cheol Hahn, Woo-Jang ASIC Laboratory Department of Electronics Engineering Korea University Korea Republic of Parallel Computation Lab. Department of Information Engineering Korea University Korea Republic of Computer System Research Department ETRI 15-ka Anam-dong Sungbuk-ku Seoul136-701 Korea Republic of

ISBN: (纸本)0780357051

A microarchitecture of a processor named RAPTOR is described. RAPTOR is a single chip multiprocessor developed for exploiting thread-level parallelism. RAPTOR includes four identical processors, a graphics coprocessor, and an external cache controller. Each processor has a 16 KB primary cache and implements SPARC version 9 instruction set architecture. The external cache controller provides direct connection to a large external second level cache. RAPTOR is designed as a building block of multiprocessor systems such as symmetric multiprocessor machines. © 1999 IEEE.

关键词： computer architecture

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Robust output feedback control of a doubly-fed induction machine

Robust output feedback control of a doubly-fed induction mac...

引用

Annual Conference of Industrial electronics Society

作者： S. Peresada A. Tilli A. Tonielli Department of Electrical Engineering Kiev Polytechnic Institute Kiev Ukraine Department of Electronics Computer and System Sciences University of Bologna Bologna Italy

In this paper a new output feedback control of a doubly-fed induction machine is presented. It provides robust regulation of the primary side active and reactive currents and it is suitable for both electric energy generation and drive applications. The control algorithm is designed in the stator (line) voltage vector oriented reference frame using only stator currents and rotor speed/position as feedback signals. Robustness properties with respect to inaccurate rotor angle position measurement and resistances variations are demonstrated by simulation and experimental tests.

关键词： Robust control Output feedback Induction machines Robustness Stators Rotors Induction generators Voltage control Signal design Algorithm design and analysis

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Automatic face recognition using neural networks

Automatic face recognition using neural networks

引用

International Conference on Microelectronics, ICM

作者： H.M. El-Bakry M.A. Abo-Elsoud M.S. Kamel Faculty of Computer Science &Information System Mansoura University Egypt Electronics & Elec. Comm. Department Faculty of Engineering Mansoura University Egypt System Design Engineering Department University of Waterloo Canada

Automatic recognition of individuals is a significant problem in the development of pattern recognition. In this paper, we introduce a simple technique for personal identification of human faces in cluttered scenes based on neural nets. In the detection phase, neural nets are used to test whether a window of 20/spl times/20 pixels contains a face or not. A major difficulty in the learning process comes from the large database required for face/nonface images. We solve this problem by dividing the data into two groups. Such division results in reduction of computational complexity, thus decreasing the time and memory needed during the image test. For the recognition phase, feature measurements are made through Fourier descriptors. Such features are modified to reduce the number of neurons in the hidden layer. Simulation results for the proposed algorithm show good performance compared with previous results.

关键词： Face recognition Neural networks Face detection Pattern recognition Testing Humans Layout Phase detection Image databases Spatial databases

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Dynamic output feedback linearizing control of a doubly-fed induction motor

Dynamic output feedback linearizing control of a doubly-fed ...

引用

IEEE International Symposium on Industrial electronics (ISIE)

作者： S. Peresada A. Tilli A. Tonielli Department of Electrical Engineering Kiev Polytechnic Institute Kiev Ukraine Department of Electronics Computer and System Sciences (DEIS) University of Bologna Bologna Italy

In this paper a controller for doubly-fed induction motor is presented. It guarantees speed tracking and reactive power regulation at the stator side. A current-fed rotor is assumed and the speed measurement is required as feedback. An original approach is used to design the controller. It is based on the decomposition of the machine model in two coupled subsystems: the stator-flux and the speed subsystems. With the proposed solution, the controlled flux subsystem is exponentially stabilized independently of the speed behavior and the speed subsystem is asymptotically linearized and decoupled from the flux dynamics. The global asymptotic stability of the overall system is theoretically proven. Simulation results confirm the good quality of the proposed controller.

关键词： Output feedback Linear feedback control systems Stators Induction motors Reactive power Rotors Velocity measurement Power system modeling Couplings Asymptotic stability

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Analysis of the snubberless operation of the emitter turn-off thyristor (ETO)

Analysis of the snubberless operation of the emitter turn-of...

引用

International Conference on Power electronics and Drive systems (PEDS)

作者： Yuxin Li A. Huang K. Motto Center for Power Electronics System The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

The emitter turn-off thyristor (ETO) is a GTO-MOSFET hybrid power semiconductor device that turns off the GTO under the unity turn-off gain condition. This paper analyzes the failure mechanism in the snubberless turn-off of the ETO and proposes solutions that extend the snubberless switching capability to the theoretical limitation of the device. Theoretical analysis and experimental results are presented.

关键词： Thyristors Failure analysis Power semiconductor switches Voltage Snubbers Power semiconductor devices Temperature Equivalent circuits Turning Cathodes

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MTO/sup TM/ thyristor: an efficient replacement for the standard GTO

MTO/sup TM/ thyristor: an efficient replacement for the stan...

引用

Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： A.Q. Huang Y. Li K. Motto B. Zhang Center for Power Electronics System Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

The MOS turn-off (MTO/sup TM/) thyristor is a novel hybrid MOS-bipolar high power semiconductor device with the advantages of the gate turn-off thyristor's (GTO) high voltage and high current capabilities, and the ease of control of a MOS gate. Voltage controlled turn-off of the GTO is realized by turning on the MOSFET. Significant simplification in the drive circuit is therefore expected for the MTO/sup TM/. Reduction or elimination of the dV/dt snubber is also demonstrated for the MTO. This paper analyzes the performance of the MTO/sup TM/ and compares that with the conventional GTO.

关键词： Thyristors Insulated gate bipolar transistors Power semiconductor devices Voltage control Snubbers Power electronics Control systems Turning MOSFET circuits Performance analysis

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RAPTOR: a single chip multiprocessor

RAPTOR: a single chip multiprocessor

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IEEE Asia-Pacific Conference on ASIC (AP-ASIC)

作者： Sang-Won Lee Yun-Seob Song Soo-Won Kim Hyeong-Cheol Oh Woo-Jang Hahn Department of Electronics Engineering ASIC Laboratory Korea University Seoul South Korea Department of Information Engineering Parallel Computation Lab Korea University Seoul South Korea Computer System Research Department Electronics and Telecommunications Research Institute Seoul South Korea

关键词： Coprocessors Yarn Parallel processing Graphics Concurrent computing Microarchitecture Multiprocessing systems Circuits Hardware Operating systems

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The design and performance evaluation of high-speed packet data MAC protocol for CDMA based IMT2000

The design and performance evaluation of high-speed packet d...

引用

Seamless Interconnection for Universal Services. Global Telecommunications Conference. GLOBECOM'99. (Cat. No.99CH37042)

作者： Sungwon Lee Young-Jae Song Dong-Ho Cho Hyunsuk Lee So-Dong Park Youngky Kim IMT2000 System Development Group Samsung Electronics Inc. South Korea Department of Computer Engineering Kyung Hee University South Korea Department of Electrical Engineering Korea Advanced Institute of Science and Technology South Korea IMT 2000 System Development Group Samsung Electronics Inc.

We propose and evaluate the performance of CDMA (code division multiple access) based high-speed packet data service MAC (medium access control) protocol for IMT2000 system. This proposed MAC supports a smooth evolution from the conventional IS-95 based system to IMT2000. Also, the proposed MAC supports connectionless packet transmission over wireless channels. Channel utilization is maximized by using discontinuous transmission mode technology and efficient channel re-use property. Most of all, a 5 ms-size message structure based control mechanism provides a fast MAC management scheme. Then a sleep-mode based physical channel control function is provided to support the power save effect and fast channel activation method. Also, channel related information is minimized by using the state transition characteristics of the proposed MAC. Especially, the proposed MAC is admitted by TR45.5 as a part of the cdmaOne standard, and proposed to ITU-R as a CDMA based IMT2000 radio transmission technology candidate.

关键词： Media Access Protocol Multiaccess communication Communication system traffic control Character generation Size control Control systems Wireless communication Telecommunication control Mobile communication High performance computing

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