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2007 International Conference on Parallel Processing Workshops, ICPPW 2007

作者： Eom, Minyoung Oh, Jaegeun Seon, Wook Kim Compiler and Embedded System Laboratory Department of Electronics and Computer Engineering Korea University Seoul Korea Republic of

ISBN: (纸本)0769529348

As 3G became the general tendency of mobile industry, new mobile handsets are challenged to show more and more functions. In order to process high-resolution images, the high-speed data transfer technology that was originally used in communication system or server system started to be adopted in mobile handsets. It is the purpose of this paper to describe and compare some technologies for high-speed data transfer between camera and ISP(Image Signal Processor) focusing on specifications in the PHY layer, after going over the structural features of the mobile handsets. Most of these technologies are based on serial interface and they show excellence in terms of power, bandwidth and EMI in comparison to the conventional parallel interface based on the LVCMOS technology. In order to verify this fact, this paper presents a comparison of the SMIA interfaced camera module which represents the serial interface (as an example of the subLVDS technology) and the parallel interfaced camera module which represents the parallel interface (as an example of a general LVCMOS technology). © 2007 IEEE.

关键词： Cameras

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Energy-saving coil excitation of electromagnetic levitation system using divided iron core type hybrid magnet

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IEEJ Transactions on Industry Applications 2007年第9期127卷 935-941+2页

作者： Kakinoki, Toshio Yamaguchi, Hitoshi Sinohara, Katsuji Department of Computer System Technology Faculty of Computer and Information Sciences Sojo University 4-22-1 Ikeda Kumamoto 860-0082 Department of Electrical and Electronics Engineering Kagoshima University 1-21-40 kourimoto Kagoshima 890-0065 Sojo University Kagoshima University

Energy saving control is desirable for magnetically levitated (MAGLEV) vehicles. Hybrid magnets controlled with zero power control system was able to reduce the exciting power. But such a conventional system needed to feed bipolar current and then the excitation system was complicated. To achieve a simple excitation system, a hybrid magnet with permanent magnets and divided cores was made. The magnet was a salient-pole type magnet and the poles were placed in two rows. Each pole of the iron cores was equipped with a coil to control both levitation force and lateral damping force. The coils of one side of the divided core were excited with a direct current driver so as to produce the same polarity as the permanent magnet and the others were excited the opposite polarity. The two sets of the coils were excited with direct current drivers each of which had one IGBT. The system needed only two IGBTs per magnet while the conventional zero power systems needed four IGBTs per magnet. According to our test results, the energy consumption was very small and the levitation part was able to start levitating from both upper and lower touch-down positions. In this paper, the characteristics of the proposed excitation system are shown.

关键词： Electric vehicles

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A distributed wearable system based on multimodal fusion

A distributed wearable system based on multimodal fusion

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3rd International Conference on Embedded Software and systems, ICESS 2007

作者： Cho, Il-Yeon Sunwoo, John Jeong, Hyun-Tae Son, Yong-Ki Ahn, Hee-Joong Lee, Dong-Woo Han, Dong-Won Lee, Cheol-Hoon Digital Home Research Division Electronics and Telecommunications Research Institute Daejeon Korea Republic of System Software Laboratory Department of Computer Engineering Chungnam National University Daejeon Korea Republic of

ISBN: (纸本)3540726845

Wearable computer can be worn anytime with the support of unrestricted communications and variety of services which provides maximum capability of information use. Key challenges in developing such wearable computers are level of comfort that users do not feel what they wear, easy and intuitive user interface and power management technique. This paper suggests a wearable system that consists of a wristwatch-type gesture recognition device and a personal mobile gateway that functional input/output modules can be freely plugged in and taken out. We describe our techniques implemented during our wearable system development: 1) multimodal fusion engine that recognizes voice and gesture simultaneously, 2) power management technique and 3) gesture recognition engine. Finally, we evaluate the performance of our multimodal fusion engine, and show the power consumption measurement data of our system built with the power management technique. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Distributed computer systems

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Camera interface method in mobile handset and its performance comparison

Camera interface method in mobile handset and its performanc...

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International Conference on Parallel Processing Workshops (ICPPW)

作者： Minyoung Eom Jaegeun Oh Seok Wook Kim Compiler and Embedded System Laboratory Department of Electronics and Computer Engineering Korea University Seoul South Korea

As 3G became the general tendency of mobile industry, new mobile handsets are challenged to show more and more functions. In order to process high- resolution images, the high-speed data transfer technology that was originally used in communication system or server system started to be adopted in mobile handsets. It is the purpose of this paper to describe and compare some technologies for high-speed data transfer between camera and ISP (image signal processor) focusing on specifications in the PHY layer, after going over the structural features of the mobile handsets. Most of these technologies are based on serial interface and they show excellence in terms of power, bandwidth and EMI in comparison to the conventional parallel interface based on the LVCMOS technology. In order to verify this fact, this paper presents a comparison of the SMIA interfaced camera module which represents the serial interface (as an example of the subLVDS technology) and the parallel interfaced camera module which represents the parallel interface (as an example of a general LVCMOS technology).

关键词： Cameras Mobile handsets Electromagnetic interference Bandwidth Telephone sets Energy consumption Displays Signal processing Multimedia systems Clocks

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A preliminary study of medical image distributed intelligent access integrated with electronic medical records system for brain degenerative disease

A preliminary study of medical image distributed intelligent...

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HEALTHCOM 2007: Ubiquitous Health in Aging Societies - 2007 9th International Conference on e-Health Networking, Application and Services

作者： Su, Mei-Ju Chen, Heng-Shuen Yang, Chung-Yi Chen, Sao-Jie Lee, Wen-Jeng Cheng, Po-Hsun Yip, Ping-Kung Liu, Hon-Mon Lai, Fei-Pei Racoceanu, Daniel Graduate Institute of Electronics Engineering College of Electrical Engineering and Computer Science National Taiwan University Department of Medical Informatics College of Medicine National Taiwan University Department of Family Medicine National Taiwan University Hospital Department of Medical Imaging National Taiwan University Hospital Information System Office National Taiwan University Hospital Department of Neurology National Taiwan University Hospital Department of Computer Science and Information Engineering College of Electrical Engineering and Computer Science National Taiwan University IPAL Institute for Infocomm Research National Taiwan University Taipei Taiwan

ISBN: (纸本)142440942X

As the computer data storage capacity increases and technology of digital imaging progresses rapidly, today we can access and manipulate huge image database on the Internet. How to search and access intelligently on content based image database become an important focus in the field of multimedia research. In this study, a preliminary system of grid-distributed, contextual and semantic based, intelligent information access framework for medical images database was designed to integrate with radiology reports and clinical department information. A prototyping was established with a model of intelligent diagnostic and therapeutic decision support for brain degenerative diseases among radiologist and neurologist. Dementia was the first disease selected for implementation. In the future, the system will extend its spectrum of diseases and more clinical specialties. © 2007 IEEE.

关键词： Medical imaging

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Efficient GTS allocation algorithm for IEEE 802.15.4

Efficient GTS allocation algorithm for IEEE 802.15.4

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7th International Conference on Computational Science, ICCS 2007

作者： Youngmin, Ji Woojin, Park Sungjun, Kim Sunshin, An Department of Telecommunication System Technology Korea University 5Ga 1 Anamdong Sungbukku Seoul 136-701 Korea Republic of Department of Electronics and Computer Engineering Korea University 5Ga 1 Anamdong Sungbukku Seoul 136-701 Korea Republic of

ISBN: (纸本)9783540725893

Recently issued standard IEEE 802.15.4 is a novel standard to achieve some critical features of wireless sensor networks. In this paper, we propose the algorithm to allocate GTSs according to the packet arrival rate from end devices and the number of devices in beacon enabled mode of IEEE 802.15.4 star topology networks. From simulation results, we show that our proposed algorithm enhances throughput comparing with the original IEEE 802.15.4 that uses only CAP duration for transmission1. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Wireless sensor networks

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Quarter-pel Interpolation Architecture in H.264/AVC Decoder

Quarter-pel Interpolation Architecture in H.264/AVC Decoder

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International Conference on Intelligent Pervasive Computing (IPC)

作者： Jongwoo Bae Neungsoo Park Seong-Won Lee System LSI Division Samsung Electronics Company Limited Suwon South Korea Department of Computer Engineering Konkuk University South Korea Department of Computer Engineering Kwangwoon University South Korea

ISBN: (纸本)9780769530062;0739530060

In this paper, to reduce the computation amount of the quarter-pel interpolation in H.264 motion compensation, two-step interpolation approach is proposed: the first step is the half-pel interpolation and the other is the quarter-pel interpolation using the previous results. The quarter-pel interpolation is performed selectively according to the motion vector. The half-pel interpolation can be performed by simple row shift operation of the data stored in the register. Therefore, the proposed approach can be implemented as an simple hardware architecture which can perform a fast interpolation enough to process high-definition videos.

关键词： Interpolation Automatic voltage control Decoding Hardware Motion compensation Video coding Pervasive computing computer architecture Registers IEC standards

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Lower Power Consumption and Wider Bandwidth of a LNA for Wireless Communication Technology at 5 GHz Band

Lower Power Consumption and Wider Bandwidth of a LNA for Wir...

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International Conference on Advanced Communication Technology (ICACT)

作者： L. Lee R. M. Sidek S. S. Jamuar S. Khatun Department of Electrical and Electronics Engineering Faculty of Engineering Universiti Putra Malaysia Selangor Malaysia Department of Computer and Communication System Engineering Faculty of Engineering Universiti Putra Malaysia Selangor Malaysia

A lower power consumption and wider bandwidth low noise amplifier (LNA) operating at 5 GHz frequency band has been designed and simulated in a standard 0.18 mum CMOS technology. The proposed topology uses a capacitor to decouple the AC and DC currents, isolating the circuit elements that are connected in series and share a common DC current. This is followed by the application of a varactor to create a wideband frequency response. The varactor has been swept with voltages stepped at 0.1, 0.5 and 0.9 V to create a wideband LNA working in the frequency range of 5.150 to 5.825 GHz. The LNA simulated provides a high gain of 36.69 dB, noise figure of less than 1.87 dB and draws current at 168.8 mA from a 1.8 power supply.

关键词： Energy consumption Bandwidth Wireless communication Communications technology CMOS technology Isolation technology Frequency Varactors Wideband Circuit noise

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Implementation of Memory-Centric NoC for 81.6 GOPS object recognition processor

Implementation of Memory-Centric NoC for 81.6 GOPS object re...

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IEEE Asian Conference on Solid-State Circuits (ASSCC)

作者： Donghyun Kim Kwanho Kim Joo-Young Kim Seungjin Lee Hoi-Jun Yoo Semiconductor System Laboratory Department of Electronics Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

An 81.6 GOPS object recognition processor based on memory-centric NoC (MC-NoC) is implemented in a 0.18-mum CMOS technology. The MC-NoC facilitates data transactions among 10 SIMD processing elements (PEs) by exploiting 8 visual image processing (VIP) memories. The 10 PEs implement special SIMD instructions to perform Gaussian filtering at 16 GOPS. The 8 VIP memories provide one cycle local maximum pixels search operation performing 65.6 GOPS. The chip dissipates 1.4 W at 200 MHz operating frequency.

关键词： Network-on-a-chip Object recognition Parallel processing CMOS technology Image processing Intelligent robots Energy consumption Pixel Memory management Communication channels

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Terahertz excitation of the higher-order plasmon modes in field-effect transistor arrays with common and separate two-dimensional electron channels

Terahertz excitation of the higher-order plasmon modes in fi...

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作者： Popov, V.V. Tsymbalov, G.M. Teperik, T.V. Fateev, D.V. Shur, M.S. Saratov Branch of Institute of Radioengineering and Electronics Russian Academy of Sciences ul. Zelenaya 38 Saratov 410019 Russia Department of Electrical Computer and System Engineering RPI/IBM Center for Broadband Data Transfer Rensselaer Polytechnic Institute Troy NY 12180 United States

Using a rigorous electrodynamic approach, the spectra of the terahertz response of periodically ordered arrays of field-effect transistors with two-dimensional electron channel were calculated. It was shown that the higher-order plasmon resonances can be excited in such structures at frequencies above 10 THz. © Allerton Press, Inc. 2007.

关键词： Plasmons

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