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IEEE Conference on Vehicular technology (VTC)

作者： Sung-Hong Wie Dong-Ho Cho Communication and Information System Laboratory Department of Electrical Engineering & Computer Science Korea Advanced Institute of Science and Technology Taejon South Korea

In wireless multimedia networks, there exists traffic asymmetry between uplink and downlink channels. The CDMA/TDD system can alleviate this problem, however, previous work in this area can not manage efficiently the traffic, asymmetry among cells. In this paper, we propose a new time slot allocation scheme that considers the traffic pattern of each cell. To solve the inter-cell interference problem, we divide a cell's area into two regions and we allocate the resource of crossed slots to mobile stations which are existing in the inner-region. This proposed scheme increases the resource utilization and decreases the blocking probability of the system as a whole. And our DARD (Different time slot Allocation based on a Region Division) scheme outperforms conventional SA (Same time slot Allocation) scheme in the heterogeneous traffic environment.

关键词： Multiaccess communication Resource management Downlink Interference Multimedia systems Intelligent networks Information systems Laboratories computer science Web and internet services

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A 2-V CMOS 455-kHz FM/FSK demodulator using feedforward offset cancellation limiting amplifier

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IEEE Journal of Solid-State Circuits 2001年第1期36卷 135-138页

作者： Po-Chiun Huang Yi-Huei Chen Chorng-Kuang Wang Circuit Design Engineering Division MediaTek Inc. Hsinchu Taiwan System-on-Chip Technology Center Industrial Technology and Research Institute Hsinchu Taiwan Department of Electrical Engineering College of Electrical Engineering and Computer Science National Taiwan University Taipei Taiwan

This paper presents a low-voltage low-power IF 455-kHz signal processor that contains a three-stage limiting amplifier and an FM/FSK demodulator. The limiting amplifier uses an on-chip feedforward offset cancellation circuit. The FM/FSK demodulator employs a quadrature detector that is composed of an on-chip phase detector and an external tank phase shifter. The demodulation constant is 20 mV/kHz with masimum /spl plusmn/10-kHz frequency deviation. The IF signal processor that consumes 2.3 mW from a single 2-V power supply demonstrates a high sensitivity of -72 dBm. It occupies an active area of 0.2 mm/sup 2/ using 0.6-/spl mu/m digital CMOS technology.

关键词： Frequency shift keying Demodulation Limiting Detectors Signal processing Phase detection CMOS technology Integrated circuit technology Automatic control Communication system control

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A comparative performance analysis of a DDR-SDRAM, a D-RDRAM, and a DDR-FCRAM using a POPeye simulator

A comparative performance analysis of a DDR-SDRAM, a D-RDRAM...

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2001 IEEE International Symposium on Circuits and systems, ISCAS 2001

作者： Lee, Kangmin Yoon, Chi Weon Woo, Ramchan Kook, Jeong-Hun Koo, Ja-Il Jung, Tae-Sung Yoo, Ho-Jun Semiconductor System Laboratory Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology 373-1 Yusong-gu Taejon 305-701 Korea Republic of Samsung Electronics San #24 Nongseo-ri. Kiheung-eup Yongin Kyungki-do 449-900 Korea Republic of

ISBN: (纸本)0780366859

We implemented POPeye (Probe of Performance+eye), a system analysis simulator to evaluate DRAM performance in a personal computer environment. When running any real-life application programs such as Microsoft Office and Paint Shop Pro on Windows OS, POPeye simulates detailed transactions between a CPU and a memory system. Using this tool, we comparatively analyzed the performance of a DDR-SDRAM, a D-RDRAM, and a DDR-FCRAM. © 2001 IEEE.

关键词： Dynamic random access storage

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A real-time color-based object tracking robust to irregular illumination variations

A real-time color-based object tracking robust to irregular ...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Yong-Beom Lee Bum-Jae You Seong-Whan Lee Department of Computer Science & Engineering Korea University Seoul South Korea Intelligent System Control Research Center Korea Institute of Science and Technology Seoul South Korea

ISBN: (纸本)0780365763

Color-based object tracking is an important issue since color is an efficient and robust visual cue for characterizing one object from the other objects. Color segmentation is, however, suffered from color variations induced from irregular illumination variations and the viewing geometry of a camera. This paper proposes a reliable color modeling approach including intensity information in HSI color space using B-spline curves based on the fact that the color distribution of a single-colored object, even in a hue-saturation plane, is not invariant with respect to brightness variations in practical cameras. By using the approach, our color-based visual tracker is able to adapt to irregular illumination variations and abrupt changes of brightness. The approach is applied to real-time face tracking under various illumination conditions in a PC-based vision system.

关键词： Robustness Lighting Face detection Brightness Cameras Histograms Clustering algorithms Tracking Geometry Spline

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Vision expert system 3D-IMPRESS for automated construction of three dimensional image processing procedures 7

Vision expert system 3D-IMPRESS for automated construction o...

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7th International Conference on Virtual systems and Multimedia, VSMM 2001

作者： Zhou, Xiang-Rong Shimizu, A. Hasegawa, J. Toriwaki, J. Hara, T. Fujita, H. Virtual System Laboratory Gifu University Gifu-shi501-1193 Japan Graduate School of Bio-Applications and Systems Engineering Tokyo University of Agriculture and Technology Tokyo184-8588 Japan School of Computer and Cognitive Sciences Chukyo University Toyota-shi470-0393 Japan Department of Information Engineering Nagoya University Nagoya-shi464-8603 Japan Department of Information Science Gifu University Gifu-shi501-1193 Japan

ISBN: (纸本)0769514022

In this paper a three dimensional (3D) image processing expert system called 3D-IMPRESS is presented. This system can automatically construct a 3D image processing procedure by using pairs of an original input image and a desired output figure called sample figure given by a user This paper describes the outline of 3D-IMPRESS and presents a method of procedure consolidation for generating a procedure commonly applicable to some other 3D gray images. Finally, we show segmentation results of 3D chest CT images by using the procedures generated by 3D-IMPRESS and discuss the performance of the system. © 2001 IEEE.

关键词： Expert systems

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Separated role of on-chip and on-PCB decoupling capacitors for reduction of radiated emission on printed circuit board

Separated role of on-chip and on-PCB decoupling capacitors f...

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IEEE International Symposium on Electromagnetic Compatibility (EMC)

作者： Jonghoon Kim Baekkyu Choi Hyungsoo Kim Woonghwan Ryu Young-hwan Yun Seog-heon Ham Soo-Hyung Kim Yong-hee Lee Joungho Kim Terahertz Media and System Laboratory Division of Electrical Engineering Korea Advanced Institute of Science and Technology Daejeon South Korea Department of Electrical Engineering and Computer ScienceKorea Advanced Institutes of Science and Technology Samsung Electronics Company Limited Daejeon South Korea

The power/ground fluctuation is known as a significant source of radiated emission. We discuss the separated functions of on-PCB and on-chip decoupling capacitors on the suppression of electromagnetic radiated emission. Due to the different ranges of parasitic inductance and the different locations of the on-chip current drivers, on-PCB and on-chip decoupling capacitors exhibit separated frequency characteristics in terms of suppression efficiency of radiation. The roles of on-PCB and on-chip decoupling capacitors are estimated by circuit simulation and a simple antenna model, and are confirmed by experiments. It is found that the on-chip decoupling capacitors are mainly effective for the suppression of radiated emission over 100 MHz frequency. Increase of the on-chip decoupling capacitance and decrease of the parasitic inductance of the package produce an improved suppression ratio at high frequency range. Combined placement and sizing of the decoupling capacitors have achieved more than 10 dB suppression of the electromagnetic radiated emission over a wide spectrum range.

关键词： Capacitors Frequency Packaging Inductance Electromagnetic radiation Network-on-a-chip Parasitic capacitance Digital circuits Voltage fluctuations Printed circuits

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A comparative performance analysis of a DDR-SDRAM, a D-RDRAM, and a DDR-FCRAM using a POPeye simulator

A comparative performance analysis of a DDR-SDRAM, a D-RDRAM...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： Kangmin Lee Chi Weon Yoon Ramchan Woo Jeong-Hun Kook Ja-Il Koo Tae-Sung Jung Ho-Jun Yoo Semiconductor System Laboratory Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea Samsung Electronics Company Limited Kiheung South Korea

ISBN: (纸本)0780366859

关键词： Performance analysis Computational modeling Probes Performance evaluation Analytical models computer simulation Random access memory Microcomputers Application software Paints

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Design approach for biomedical smart sensors

Design approach for biomedical smart sensors

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Midwest Symposium on Circuits and systems (MWSCAS)

作者： R.L. Ewing H.S. Abdel-Aty-Zohdy Air Force Research Laboratory Inforamation Directorate Adjunct Professor Department of Electrical and Computer Engineering Air Force Institute of Technology USA Microelectronics System Design Laboratory Department of Electrical and Systems Engineering Oakland University Rochester MI USA

ISBN: (纸本)078037150X

system-on-Chip solid state circuits that sense, receive, transmit, and process signals are the sensors, or eyes and ears, of the medical field of the millennium. The goal and design of the system-on-Chip (SOC) program for industry will be to provide affordable, reproducible, and reliable front-end instrumentation, components and subsystems for medical systems. To process/store/analyze the signals acquired from these medical sensors, analog/digital systems are used to provide data fusion and information extraction. These biomedical smart sensors cover the hybrid domains of mixed-technology (electrical, mechanical, optical, thermal, biochemical) and mixed-concept (electrical, control, digital signal processing). These significant domain design differences impose robust design challenges for medical sensor technology.

关键词： Intelligent sensors Biosensors system-on-a-chip Signal processing Sensor systems Mechanical sensors Solid state circuits Eyes Ear Instruments

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Kinematic modeling of mobile robots by transfer method of augmented generalized coordinates

Kinematic modeling of mobile robots by transfer method of au...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Wheekuk Kim Do Hyung Kim Byung-Ju Yi Bum Jae You Department of Control and Instrumentation Engineering Korea University South Korea School of Electrical Engineering and Computer Science Hanyang University South Korea Intelligent System Control Research Center Korea Institute of Science and Technology South Korea

ISBN: (纸本)0780365763

A kinematic modeling method is proposed which uses augmenting variables to match the dimensions of the input vector and output vector of each serial subchain of the mobile robots. Firstly, kinematic models of various type of wheels are derived including skidding and sliding velocities. Then the method of augmented generalized coordinates is applied to obtain inverse and forward kinematic models. The kinematic models derived by the direct inverse of the augmented matrices provide an accurate solution, which was not achievable by the modeling method based on the pseudo-inverse method which provides an approximate solution. Lastly, two kinematic models for typical, differential-driven mobile robots are presented to show the effectiveness of the proposed modeling method.

关键词： Mobile robots Wheels Electric variables control Intelligent robots Robot kinematics Instruments computer science Intelligent systems Intelligent control Control system synthesis

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An anti oscillation strategy for the regenerative braking control of permanent magnet synchronous motor with insufficient load power consumption

An anti oscillation strategy for the regenerative braking co...

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Annual Conference of Industrial Electronics Society

作者： F. Yusivar K. Uchida T. Kihara S. Wakao K. Kondo K. Matsuoka Department of Electrical Electronics and Computer Engineering Waseda University Tokyo Japan Electric Drive System Group Vehicle Technology Development Division JR Railway Technical Research Institute Kokubunji Tokyo Japan

In a DC-fed motor drive system that implements a regenerative braking control strategy, the oscillation phenomenon in electrical system occurs due to the regenerative power regulating to prevent a DC-link overvoltage condition. In this paper the oscillation phenomenon of electrical system in the PMSM drive of railway vehicle system with a light-load regenerative braking control is pointed out. First, a simulation is carried out to confirm the oscillation phenomenon occurrence. The investigated model is then derived and its stability analysis is elucidated. Base on the analysis results a novel anti-oscillation strategy is proposed. A downsized experimental system is used for validation purposes. It is verified that the proposed strategy eliminates the oscillation effectively.

关键词： Permanent magnets Control systems Rail transportation Lighting control Voltage control Vehicle driving Electric vehicles Power system modeling Filters Capacitors

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