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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...

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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

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.

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...

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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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Access region locality for high-bandwidth processor memory system design

Access region locality for high-bandwidth processor memory s...

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IEEE/ACM International Symposium on Microarchitecture (MICRO)

作者： Sangyeun Cho Pen-Chung Yew Gyungho Lee MCU Team System LSI Division Samsung Electronics Company Limited Yongin si South Korea Department of Computer Science and Engineering University of Minnesota Minneapolis MN USA Department of Electrical and Computer Engineering Iowa State University Ames IA USA

This paper studies an interesting yet less explored behavior of memory access instructions, called access region locality. Unlike the traditional temporal and spatial data locality that focuses on individual memory locations and how accesses to the locations are inter-related, the access region locality concerns with each static memory instruction and its range of access locations at run time. We consider program's data, heap, and stack regions in this paper. Our experimental study using a set of SPEC95 benchmark programs shows that most memory reference instructions access a single region at run time. Also shown is that it is possible to accurately predict the access region of a memory instruction at run time by scrutinizing the addressing mode of the instruction and the past access region history of it. A simple run-time access region predictor is developed that is similar to a branch predictor in structure. We describe and evaluate a superscalar processor with two distinct sets of memory pipelines, driven by the access region predictor. Experimental results indicate that the proposed mechanism is very effective in providing high memory bandwidth to the processor, resulting in comparable or better performance than a conventional memory design with a heavily multi-ported data cache that can lead to much higher hardware complexity.

关键词： Bandwidth Hardware Delay computer aided instruction Microprocessors Cache memory Large scale integration History Runtime Pipelines

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Wireless ATM MAC layer protocol using WDWEDF and two-phase scheduling algorithm

Wireless ATM MAC layer protocol using WDWEDF and two-phase s...

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

作者： Sungwon Lee Young-Jae Song Dong-Ho Cho Yong-Bae Dhong Jung-Won Yang 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 Korea Electronics and Technology Institute South Korea

We propose and evaluate the performance of the wireless ATM MAC layer protocol to support efficiently various ATM traffic, such as CBR, VBR, ABR and UBR, in wireless ATM network environments for the reverse and forward link. The proposed MAC protocol could extend efficiently the service discipline of ATM traffic from wired network to wireless ATM network environments. Thus, the available bandwidth, which is remaining except the bandwidth for CBR and VBR traffic, could be effectively allocated to ABR and UBR traffic. Especially, in view of the reverse link, a two-phase scheduling algorithm supports successfully the variable characteristics of VBR traffic. Also, in view of the forward link, 'wireless dynamic weighted earliest deadline first' scheduling algorithm minimizes the mean cell delay and required buffer size. Simulation results show that proposed method provides effective performance in wireless ATM environments.

关键词： Media Access Protocol Wireless application protocol Scheduling algorithm Telecommunication traffic Bandwidth Traffic control Wireless networks Delay Multimedia communication Mobile communication

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Exciton localization in InGaN quantum well devices

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Journal of Vacuum Science & Technology B: Microelectronics Processing and Phenomena 1998年第4期16卷 2204-2204页

作者： Chichibu, Shigefusa Sota, Takayuki Wada, Kazumi Nakamura, Shuji Materials Department University of California Santa Barbara California 93106 Faculty of Science and Technology Science University of Tokyo Noda Chiba 278-8510 Japan Department of Electrical Electronics and Computer Engineering Waseda University Shinjuku Tokyo 169-8555 Japan Compound Semiconductor Materials Research NTT System Electronics Laboratories Atsugi Kanagawa 243-0198 Japan Department of Research and Development Nichia Chemical Industries Limited Kaminaka Anan Tokushima 774-8601 Japan

Emission mechanisms of a device-quality quantum well (QW) structure and bulk three dimensional (3D) InGaN materials grown on sapphire substrates without any epitaxial lateral overgrown GaN base layers were investigated. The InxGa1−xN layers showed various degrees of in-plane spatial potential (band gap) inhomogeneity, which is due to a compositional fluctuation or a few monolayers thickness fluctuation. The degree of fluctuation changed remarkably around a nominal InN molar fraction x=0.2, which changes to nearly 0.08–0.1 for the strained InxGa1−xN. This potential fluctuation induces localized energy states both in the QW and 3D InGaN, showing a large Stokes-like shift. The spontaneous emission from undoped InGaN single QW light-emitting diodes (LEDs), undoped 3D LEDs, and multiple QW (MQW) laser diode (LD) wafers was assigned as being due to the recombination of excitons localized at the potential minima, whose lateral size was determined by cathodoluminescence mapping to vary from less than 60 to 300 nm in QWs. Those structures are referred to as quantum disks (Q disks) or segmented QWs depending on the lateral size. Blueshift of the emission peak by an increase of the driving current was explained to be combined effects of band filling of the localized states by excitons and Coulomb screening of the quantum confined Stark effect induced by the piezoelectric field. The lasing mechanisms of the continuous wave In0.15Ga0.85N MQW LDs having small potential fluctuations can be described by the well-known electron-hole-plasma (EHP) picture. However, the inhomogeneous MQW LDs are considered to lase by EHP in segmented QWs or Q disks. It is desirable to use entire QW planes with small potential inhomogeneity as gain media for higher performance LD operation.

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Robust active-reactive power control of a doubly-fed induction generator

Robust active-reactive power control of a doubly-fed inducti...

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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 (DEIS) University of Bologna Bologna Italy

In this paper a torque tracking and reactive-power regulating controller for doubly-fed induction generator is developed. This solution doesn't need stator current measurements and shows good robustness with respect to parameter uncertainties and measurement errors. Hence machine characterization is not critical and a standard position/velocity sensor (encoder) can be used. The Lyapunov-like method and back-stepping procedure are used to design the controller. A particular starting procedure has been developed in order to minimize initial transient after connection of the generator to the line grid.

关键词： Robust control Power control Torque control Induction generators Stators Current measurement Robustness Uncertain systems Measurement errors Sensor phenomena and characterization

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Indirect field-oriented control of induction motor: new design leads to improved performance and efficiency

Indirect field-oriented control of induction motor: new desi...

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Annual Conference of Industrial electronics Society

A new design strategy is proposed for the development of indirect field-oriented induction motor controllers. It allows achieving global asymptotic speed-flux tracking in presence of unknown load torque and it combines improved robustness and energy efficiency, with a simple procedure for controller parameters' tuning and low implementation complexity.

关键词： Induction motors Control systems Algorithm design and analysis Inverters Robust control Energy efficiency Torque control Stability system performance Feedback control

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An Effective Cell Scheduler Guaranteeing Fairness for Input-queued ATM Switch

An Effective Cell Scheduler Guaranteeing Fairness for Input-...

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1998 International Conference on Communication Technology

作者： Mihye Lee Sungjin Moon Heasook Park Kwangsuk Song Boseob Kwon Daeyoung Kim Processor System Team Electronics and Telecommunication Research Institute Department of Computer Engineering Education Andong National University Department of Information and Communication Engineering Chungnam National University

ISBN: (纸本)7800908275

High-speed input queued switches are known to more economical and simpler than output queued ***,they suffer from HOL blocking which degrades throughput *** queued switches can achieve higher throughput if they use random access input queues and cell scheduling ***, input queued ATM switches employing the cell- scheduling algorithm can increase the throughput by preventing output ***-firing cell scheduling algorithm in input queued ATM switches has been proposed but it is unfair in the sense that the throughputs from various input ports differ by significant *** this paper, we propose cell scheduler that has inherent fairness property under any traffic pattern and prove that the proposed cell scheduler guarantee fairness even if traffic is not uniform pattern by computer simulation.

关键词： ATM An Effective Cell Scheduler Guaranteeing Fairness for Input-queued ATM Switch

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