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5th Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim 2003

作者： Tanaka, Y. Asano, T. Akahane, Y. Song, B.S. Noda, S. Department of Electronic Science and Engineering Kyoto University Kyoto606-8501 Japan Core Research for Evolutional Science and Technology Japan Science and Technology Corporaton Kyoto606-8501 Japan Itami Research Laboratories Sumitomo Electric Industries Ltd. Japan

The effects of vertical structural asymmetries in two-dimensional photonic crystal slab waveguides are investigated. It is shown that coupling between TE-like and TM-like modes occurs, which results in large propagati... 详细信息

ISBN: (纸本)0780377664

关键词： Photonic crystals

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Collinear holography 5

Collinear holography

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5th Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim 2003

作者： Horimai, Hideyoshi OPTWARE Corporation 2-5-1 Shin-Yokohama Kohoku-ku Yokohama Kanagawa222-0033 Japan Japan Science and Technology Corporation Core Research for Evolutional Science and Technology Kawaguchi Saitama332-0012 Japan

ISBN: (纸本)0780377664

Collinear Holographic Memory is proposed and demonstrated. "Reference beam" and "signal beam" are bundled on the same axis, and irradiated on the recording medium through a single objective lens. This method enables us to reconstruct the hologram image with a collinear optical configuration. © 2003 IEEE.

关键词： Holograms

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Detection of mitomycin C-induced testicular toxicity by micronucleus assay in mice

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Reproductive Medicine and Biology 2003年第2期2卷 69-73页

作者： Nakagawa, Soichi Mori, Chisato Department of Bioenvironmental Medicine Graduate School of Medicine Chiba University Chiba Japan Toxicology Research Laboratories Fujisawa Pharmaceutical Company Co. Ltd Osaka Japan Core Research for Evolutional Science and Technology (CREST) Saitama Japan

Background, Aims and Methods: Mitomycin C is a promising cancer agent that has been shown to inhibit DNA synthesis. Our previous study showed that mitomycin C induces spermatogenic cell apoptosis in the mouse testis. By using TdT-mediated dUTP-biotin nick-end labeling in the study, we confirmed that apoptotic cell death was most commonly found in the spermatogonia and less frequently found in spermatocytes in mitomycin C-treated mice. We therefore hypothesized that the spermatogenic cell apoptosis induced by mitomycin C occurred as the result of a mechanism to eliminate male germ cells with DNA damage or chromosomal aberrations. To test our hypothesis, we used a micronucleus assay for the detection of chromosomal damage induced in the spermatogonia or spermatocyte stages. Results and Conclusions: The frequency of micronuclei was clearly increased in the mitomycin C-treated animals, and the number of micronuclei was greater at the spermatogonia or early spermatocyte stage than at the secondary spermatocyte stage. These results revealed that apoptosis and chromosomal aberration in the mouse testis after mitomycin C treatment occurred in the same cell types, that is, spermatogonia and spermatocytes. These findings indicate that chromosomal aberration of the spermatogenic cells induced by mitomycin C may have caused the spermatogenic cell apoptosis. (Reprod Med Biol 2003;2: 69–73). © 2003, John Wiley and Sons Ltd. All rights reserved.

关键词： acridine mice micronucleus mitomycin C testis

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Study on the surface reaction kinetics of InGaAs related materials MOCVD through analyses of growth rate distribution in the selective area growth

Study on the surface reaction kinetics of InGaAs related mat...

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2003 International Conference on Indium Phosphide and Related Materials, IPRM 2003

作者： Oh, H.J. Im, I.T. Sugiyama, M. Nakaro, Y. Shimogaki, Y. Department of Materials Engineering School of Engineering University of Tokyo Japan Department of Electronic Engineering School of Engineering University of Tokyo Japan Research Center for Advanced Science and Technology University of Tokyo Japan Core Research for Evolutional Science and Technology Japan Science and Technology Corporation Japan

ISBN: (纸本)0780377044

Wide stripe selective area growth was proposed as a tool for getting information on surface kinetics in the metalorganic chemical vapor deposition (MOCVD). GaAs and InP were grown over patterned substrates using SiO2 mask. The characterized growth-rate enhancement profiles were successfully fitted with 2-dimensional simulation taking only gas phase diffusion into account except for the profiles in the vicinity of mask edge, which seemed to reflect surface diffusion. Considering that gas phase diffusion coefficient can be estimated by observing a reactor-scale growth-rate profile, the only parameter determining growth-rate enhancement profile was sticking probability of a film precursor on the surface of GaAs. The estimated sticking probability was 0.05 - 0.4 for GaAs and 0.26 - 0.5 for InP. The information on the surface reaction was gathered in various conditions, such as temperature, group V partial pressure. The study on polycrystalline growth over mask was also carried out using the information of SAG analysis. It is shown that polycrystals was generated when the concentration of a film precursor just above the mask exceeded a critical value. This information is important not only for the design of selective area growth process but also for constructing more realistic reaction model of MOCVD. © 2003 IEEE.

关键词： Indium phosphide

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Control of indium surface segregation in GaAs layer on InGaP grown by MOVPE

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MRS Online Proceedings Library 2003年第1期744卷 1-6页

作者： Fukushima, Y. Nakano, Y. Shimogaki, Y. School of Engineering University of Tokyo Bunkyo-ku Japan CREST (Core Research for Evolutional Science and Technology) JST (Japan Science and Technology Corporation) USA

In order to fabricate good hetero-interface of GaAs/InGaP system by metal-organic vapor phase epitaxy (MOVPE), we studied the indium atom distribution by X-ray photoelectron spectroscopy (XPS). The systematic XPS depth profile analyses of InGaP/GaAs revealed that InGaP surface contains an excess amount of indium atoms. The excess indium atoms diffuse into GaAs layer and cause surface segregation. We have developed a novel gas switching sequence to switch the growth from InGaP to GaAs. That is, after the growth of InGaP, trimethylgallium (TMGa) was pre-introduced to the reactor to terminate the excess amount of indium atoms on InGaP layer. Then tertiarybutylarsine (TBAs) was allowed to flow on the InGaP surface to initiate GaAs growth. This new sequence reduced the amount of indium atoms at the interface and contributed to suppress the inter-diffusion and surface segregation of indium atoms.

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Association of testicular undescent induced by prenatal flutamide treatment with thickening of the cremaster muscle in rats

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Reproductive Medicine and Biology 2003年第3期2卷 109-113页

作者： Matsuno, Yoshiharu Komiyama, Masatoshi Tobe, Toyofusa Toyota, Naoji Adachi, Tetsuya Mori, Chisato Departments of Bioenvironmental Medicine Japan Urology Graduate School of Medicine Chiba University Chiba Japan Department of Social Welfare and Environment Kumamoto Gakuen University Kumamoto Japan Center for Research and Development of Bioresources Research Institute for Advanced Science and Technology Osaka Prefecture University Osaka Sakai Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Corporation (JST) Kawaguchi Japan

Background and Aims: Previously, in cryptorchid rats, which were induced by prenatal exposure to flutamide, we found a thickening of the cremaster muscle. This study was undertaken to quantify the increase of the cremaster muscle thickness in the cryptorchid rats, and to examine its possible relationship with the proliferation of muscle cells. Methods: To obtain cryptorchid rats, pregnant Wistar rats were subcutaneously injected with flutamide (100 mg/kg per day) during gestational days 16–17. Serial sections of the scrotum, containing the testis and cremaster muscle, were prepared from the control and cryptorchid rats that were 2–6 weeks of age, and stained with hematoxylin–eosin for morphometry, or stained with antibody against the proliferating cell nuclear antigen (PCNA) to analyze the cell proliferation ability. Results: The thickened cremaster muscle was always associated with cryptorchid testis and, in the case of unilateral cryptorchidism, the cremaster muscle of the contralateral (descended testis) side exhibited normal thickness. The average thickness of the affected cremaster muscle was 0.80 and 1.89 mm at 4 and 6 weeks of age, respectively, although that of the normal muscle was 0.28 and 0.33 mm at the same time period, respectively. Conclusion: Our results showed that the cremaster muscle of the cryptorchid rats was significantly thicker than that of the control rats. The immunohistochemical analysis revealed that a thickened cremaster muscle contained many PCNA-positive nuclei even at 4 weeks of age, in contrast to the control, which had only a few positive nuclei. Our present study indicates that continuous proliferation of the muscle cells associated with cryptorchid testis increases the thickness of cremaster cells in rats exposed to flutamide prenatally. (Reprod Med Biol 2003;2: 109–113). © 2003, John Wiley and Sons Ltd. All rights reserved.

关键词： cremaster muscle cryptorchidism flutamide rat testicular descent

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A new method on assigning function types to line segments for function approximation-based image coding

A new method on assigning function types to line segments fo...

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IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： F. Kawazoe K. Toraichi P.W.H. Kwan Donoral Program Graduate School of Systems and lnformation Engineering University of Tsukuba Japan Institute of Information Science and Electronics University of Tsukuba Japan Core Research for Evolutional Science & Technology Program Japan Science and Technology Corporation Japan

This paper proposes a new method to determine the types of function for approximating line segments using an algorithm based on binary search. In the function approximation-based image coding, it is essential that the joint points between different types of line segment be extracted precisely. Through experiments, it is verified that the proposed method extracts straight lines and arcs more precisely than the earlier method.

关键词： Image segmentation Function approximation Image coding Paper technology Flowcharts Systems engineering and theory Information science Electronic mail Pixel Target tracking

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A method on tracking common boundaries of color regions in function approximation-based image coding

A method on tracking common boundaries of color regions in f...

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IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： T. Sugiyama P.W.H. Kwan K. Toraichi K. Katagishi Doctoral Program Graduate School of Systems and Information Engineering University of Tsukuba Japan Core Research for Evolutional Science & Technology Program Japan Science and Technology Corporation Japan Institute of Information Sciences and Electronics University of Tsukuba Japan

A boundary tracking method crucial to function approximation-based image coding is proposed that solves the problems caused by duplicate tracking the common boundaries of color regions when methods conventionally applied to bilevel raster images are inappropriately used. Experimental evaluation is performed to verify its effectiveness.

关键词： Function approximation Image coding Colored noise Color Image reconstruction Systems engineering and theory Electronic mail Performance evaluation Spline Internet

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Reconstructions and predictions of nonlinear dynamical systems by Rao-Blackwellised sequential Monte Carlo

Reconstructions and predictions of nonlinear dynamical syste...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： T. Soma K. Yosui T. Matsumoto Core Research for Evolutional Science and Technology(CREST) Department of Electrical Electronics and Computer Engineering Waseda University Tokyo Japan

Sequential Monte Carlo (SMC) is a powerful sampling based inference/learning algorithm for Bayesian scheme. The purpose of this paper is two fold. It first attempts to reconstruct and predict nonlinear dynamical systems from one dimensional data which arrives in a sequential manner instead of batch manner. Second purpose is to test the performance of the Rao-Blackwellisation in reconstructing and predicting nonlinear dynamical systems. We demonstrate that Rao-Blackwellised sequential Monte Carlo (RBSMC) on a chaotic time series prediction problem outperforms generic SMC.

关键词： Nonlinear dynamical systems Monte Carlo methods Bayesian methods Uncertainty Equations Sliding mode control Chaos Power engineering computing Power engineering and energy Sampling methods

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All-optical signal processing using polarization bistable VCSELs for ultrafast photonic networks

All-optical signal processing using polarization bistable VC...

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International Conference on Advanced Optoelectronics and Lasers (CAOL)

作者： H. Kawaguchi Fuculty Engineering Yamagata University Yonezawa Yamagata Japan Core Research for Evolutional Science and Technology CREST Japan Science and Technology Corporation Kawaguchi Saitama Japan

Experimental demonstrations of an all-optical demultiplexing and all-optical format conversions, using an ultrafast polarization bistable VCSEL are presented. 3R regeneration using the VCSEL is proposed and numericall... 详细信息

关键词： Signal processing Vertical cavity surface emitting lasers Optical polarization Optical buffering Repeaters Optical bistability Optical pulses Bit rate Degradation Paper technology

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