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IEEE International Symposium on Electromagnetic Compatibility (EMC)

作者： A. Nishizawa M. Shimazaki S. Tanabe Advanced Technology R&D Center Mitsubishi Electric Corporation Limited Amagasaki Hyogo Japan Design System Engineering Center Mitsubishi Electric Corporation Limited Yokohama Japan

Ground bouncing noise was analyzed by a link program of finite difference time domain (FdTd) and SPICE. In this program, the electric characteristics of buffer ICs is computed by SPICE, whereas the distributed parameter of a printed circuit board (PCB) and electromagnetic (EM) wave radiation to the open air are computed by FdTd. Typical bouncing voltage and current waveforms can be obtained by this program. The computed results agree with the measurement results.

关键词： Joining processes Finite difference methods Time domain analysis SPICE distributed computing Electromagnetic radiation Circuit noise Electric variables Printed circuits Electromagnetic scattering

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Image analysis of quick phase eye movement in nystagmus

Image analysis of quick phase eye movement in nystagmus

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： A. Iijima A. Ueno M. Nishimura N. Ishikawa H. Hosaka H. Minamitani Institute of Biomedical Engineering Graduate school of Science and Technology Keio University Yokohama Kanagawa Japan Department of R&D Center Nihon Kohden Corporation Japan

A high speed video camera was used for analysis of quick phase eye movement in nystagmus. The frame rate of the camera was 250 Hz. Using a rotary slit-light projection system, optokinetic nystagmus (OKN) was easily evoked and the consequent eye movement was analysed by an image processing system. The high velocity component in nystagmus can be precisely detected with 250 Hz video rate while those with 30 Hz conventional rate showed a poor result in which the high velocity component declined significantly. The high speed video system was suitable for the analysis of the quick phase of nystagmus, especially in clinical diagnosis.

关键词： Image analysis Cameras Phase detection Charge-coupled image sensors Image processing Clinical diagnosis Charge coupled devices Electrodes Biomedical engineering Educational institutions

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Fabrication of accelerometer using single-step electrochemical etching for micro structures (SEEMS)

Fabrication of accelerometer using single-step electrochemic...

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IEEE International Conference on Micro Electro Mechanical Systems

作者： H. Ohji P.T.J. Gennissen P.J. French K. Tsutsumi Advanced Technology R&D Center Mitsubishi Electronic Corporation Amagasaki Hyogo Japan DIMES Faculty of Electrical Engineering Delft University of Technnology Delft Netherlands

This paper presents a new wet etching technique for micromachining called SEEMS (Single-step Electrochemical Etching for Micro Structures). An accelerometer structure can be achieved using this SEEMS process. However, some problems which are involved in the SEEMS process had to be solved. The two main problems are: firstly, over etching can be seen at the clamping point of freestanding beam, and secondly, from the theoretical point of view, it is difficult to remove large region or to make one hole in a large area. These problems can be considerably reduced by improved mask layout and perforated mass supported by single cantilever can be achieved. Additionally, new initial pit formation is demonstrated to make structures which are free from crystal orientation of silicon substrate.

关键词： Fabrication Accelerometers Silicon Micromachining Wet etching Mechanical factors research and development Clamps Temperature Micromechanical devices

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Pulsed laser deposition of diamondlike carbon films on gated Si field emitter arrays for improved electron emission

Pulsed laser deposition of diamondlike carbon films on gated...

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International Conference on Microprocesses and Nanotechnology

作者： O. Yavas T. Hashimoto N. Suzuki M. Takai Y. Higuchi M. Kobayashi A. Hosono S. Okuda Research Center for Materials Science at Extreme Conditions and Graduate School of Engineering Science Osaka University Toyonaka Osaka Japan Advanced Technology R&D Center Mitsubishi Electric Corporation Limited Amagasaki Hyogo Japan

Pulsed laser deposition of thin dLC films with a thickness of up to 6 nm was observed to increase the emission current and stability from niobium-gated Si field emitter arrays. Thicker films, on the other hand, caused... 详细信息

关键词： Pulsed laser deposition Optical pulses diamond-like carbon Semiconductor films Field emitter arrays Optical arrays Electron emission Surface emitting lasers Stability Carbon dioxide

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Evaluation of a high power ArCP voltage source inverter with IGCTs

Evaluation of a high power ARCP voltage source inverter with...

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

作者： S. Bernet r. Teichmann J. Weber P.K. Steimer ABB Corporate Research Center Heidelberg Germany Department of Electrical Engineering Dresden University of Technology Dresden Germany R&D Drives and Power Electronics ABB Industrie AG Turgi Switzerland

An evaluation and comparison of a two-level conventional voltage source inverter (VSI) and an auxiliary resonant commutated pole voltage source inverter (ArCPVSI) featuring IGCTs for a 3 MVA application is presented. design issues of both topologies are addressed. The IGCT loss approximations are based on extensive measurements of the devices under hard and soft switching conditions. The results show that the ArCPVSI with IGCTs is a highly competitive alternative to conventional VSIs in this power range.

关键词： Voltage Thyristors Pulse width modulation inverters Insulated gate bipolar transistors resonance Topology Power semiconductor switches Commutation Costs Protection

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Barrier properties of Ta–ruO2 diffusion barrier for dynamic random access memory capacitor bottom electrodes

Journal of Vacuum Science & Technology B: Microelectronics a...

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Journal of Vacuum Science & technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena 1999年第4期17卷 1470-1476页

作者： dong-Soo Yoon Hong Koo Baik Sung-Man Lee Sang-In Lee Department of Metallurgical Engineering Yonsei University Seoul 120-749 Korea Department of Materials Engineering Kangwon National University Chuncheon Kangwon-Do 200-701 Korea Development of Technology Semiconductor R&D Center Samsung Electronics Co. San#24 Nongseo-Lee Kiheung-Eup Yongin-City Kyungki-Do 449-900 Korea

We proposed the Ta–ruO2 diffusion barrier for oxygen in the dynamic random access memory capacitor bottom electrode, and investigated the barrier and electrical properties of the developed diffusion barrier. The Ta–ruO2/TiSi2/poly-Si/SiO2/Si contact system deposited with and without the SiO2 capping layer showed the lower total resistance and ohmic characteristics up to 800 °C. For the Ta–ruO2/TiSi2/poly-Si/SiO2/Si contact system, no other phases observed except for the formation of conductive ruO2 phase in the barrier film by reaction with the indiffused oxygen after annealing in air, but the thin oxidized layer at the Ta–ruO2/TiSi2 interface was formed by external oxygen. However, a large number of the crystallites in the annealed samples compared to that of as-deposited film were observed even after depth profile. The crystallites consisted of ru and O containing a small amount of Ta. In addition, the embedded ruO2 crystalline phase was observed in the thin oxidized TiSi2 surface layer. Correspondingly, we suggest that the ohmic mechanism of the Ta–ruO2/TiSi2/poly-Si/SiO2/Si contact system is an embedded ruO2 crystalline phase involving a small amount of Ta in a Ta amorphous structure.

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On the use of LSF intermodel interlacing property for spectral quantization

On the use of LSF intermodel interlacing property for spectr...

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IEEE Workshop on Speech Coding Proceedings

作者： Mi Suk Lee Hong Kook Kim Seung Ho Choi Hwang Soo Lee Department of Electrical Engineering Korea Advanced Institute of Science and Technology Daejeon South Korea AT and T Research Laboratories Florham Park NJ USA Human & Computer Interaction Laboratory Samsung Advanced Institute of Technology Gyeonggi South Korea Central R&D center SK Telecom Daejeon South Korea

The line spectral frequencies (LSFs) extracted from successive analysis orders are interlaced with each other. This intermodel interlacing property gives a new relationship between the closeness of LSFs and their spectral sensitivities, which enables us to propose a weighting function for LSF distortion measurement. By applying the proposed weighting function to an LSF quantizer, we can achieve better performance than when using the conventional heuristic functions. Moreover, the complexity of the proposed weighting function is much lower than that of the optimal weighting function, while their performances are almost the same.

关键词： Quantization Frequency Covariance matrix distortion measurement Linear predictive coding Euclidean distance Weight measurement Polynomials reflection Humans

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Intelligent Monitoring System for Grinding Process by recurrent Fuzzy Inference -Evaluation of Inferred Surface roughness Using degree of Fuzziprsss-

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Journal of robotics and Mechatronics 1999年第5期11卷 423-430页

作者： Kobayashi, Futoshi Arai, Fumihilo Fukuda, Toshio Onoda, Makoto Hottav, Yuzo Department of Micro System Engineering Nagoya University 1 Furo-cho Chikusa-ku Nagoya464-8603 Japan Center for Cooperative Research in Advanced Science & Technology Nagova University 1 Furo-cho Chikusa-ku Nagoya464-8601 Japan Production Machinery R&D Center NTN Corporation 1578 Higashi-Kaizuka Iwata438-8510 Japan

Grinding process is frequently used to produce a smooth surface in the manufacturing system. recently, for using a super-abrasive wheel economically, grinding system needs to measure the surface roughness. However, it is difficult to measure surface roughness in process because it takes a long time to measure it. We have to infer the surface roughness in process by online sensor information and evaluate the reliability of inferred surface roughness. We have proposed recurrent Fuzzy Inference (rFI) for estimating it. But, rFI cannot evaluate the reliability of inferred surface roughness. In this paper, we evaluate the reliability of inferred surface roughness by the degree of fuzziness that shows the lack of difference between the fuzzy set and the fuzzy complement. We show the experimental result of inferring, and evaluating the surface roughness in grinding process. © 1999, Fuji technology Press. All rights reserved.

关键词： Surface roughness

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View synthesis by assembling parts of pre-acquired images

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Systems and Computers in Japan 1999年第9期29卷

作者： Katsuyuki Kamei Minoru Maruyama Kazuo Seo Advanced Technology R&D Center Mitsubishi Electric Corporation Amagasaki Japan Faculty of Engineering Shinshu University Nagano Japan

This paper presents a newly developed image-based rendering technique for constructing a virtual environment. The method synthesizes a new view by splitting source images and assembling the divided sections (stripes) according to the viewing rays. The most important feature of the method is that it does not need a precisely-captured large set of source images. Instead, it focuses on the object and synthesizes a new image by selecting the most suitable stripe among the pre-acquired source images. This makes it possible to use only a limited set of source images. Also, it eliminates preliminary processes, such as obtaining correspondences between multiple images. As a result, it makes it easier to input a natural scene into the computer and to reproduce it as a virtual environment. We also describe improvements in image quality obtained by smoothing, examination of errors in the synthesized image, and a technique for arranging input points of source images. Moreover, an efficient method for data management is investigated. Fine images can be synthesized for a viewpoint that moves in any horizontal direction, so that a virtual environment with powerful walkthrough operations can be easily constructed. © 1998 Scripta Technica, Syst Comp Jpn, 29(9): 1–12, 1998

关键词： virtual environment view synthesis image-based rendering image stripe Peano scan

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Effect of gas ambient on improvement in emission behavior of Si field emitter arrays

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Journal of Vacuum Science & technology B: Microelectronics Processing and Phenomena 1998年第2期16卷 799-799页

作者： Takai, Mikio Morimoto, Hiroji Hosono, Akihiko Kawabuchi, Shinji Research Center for Materials Science at Extreme Conditions and Graduate School of Engineering Science Osaka University Toyonaka Osaka 560 Japan Advanced Technology R&D Center Mitsubishi Electric Corporation 1-1 Tsukaguchi-Honmachi 8 Amagasaki Hyogo 661 Japan

Gated Si field emitter arrays (FEAs) have been operated in various gas atmospheres such as air, H2 , O2 , and Ar at 10−7 Torr to improve the emission behavior. The electron emission from the FEAs was enhanced by a factor of up to 10 during or after gas ambient emission with H2 , O2 , and Ar, while the improvement was not observed by a process with air. Fowler–Nordheim plots indicated a drastic change in slope only for H2 processes, in which hydrogen atoms would adsorb to Si tip surfaces. An emission pattern with a fourfold symmetry was observed for a single-tip emitter after hydrogen ambient emission, indicating the tip surface crystallinity after gas ambient emission.

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