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Body Characteristics of Professional Japanese Keirin Cyclists： Flexibility, Pelvic Tilt, and Muscle Strength

Journal of Sports Science 2016年第6期4卷 341-345页

作者： Yuto Tashiro Satoshi Hasegawa Shu Nishiguchi Naoto Fukutani Daiki Adachi Takayuki Hotta Saori Morino Hidehiko Shirooka Yuma Nozaki Hinako Hirata Moe Yamaguchi seishiro tasaka Tomohumi Matsushita Keisuke Matsubara Tomoki Aoyama Human Health Sciences Graduate School of Medicine Kyoto University Kyoto 606-8501 Japan Research Fellow of the Japan Society for the Promotion of Science Tokyo 102-0083 Japan

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Nonlinear Vibration Induced by the Water-film Whirl and Whip in a Sliding Bearing Rotor System

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Chinese Journal of Mechanical Engineering 2016年第2期29卷 260-270页

作者： ZHAI Liming LUO Yongyao WANG Zhengwei KITAUCHI seishiro MIYAGAWA Kazuyoshi State Key Laboratory of Hydroscience and Engineering Tsinghua University Department of Thermal Engineering Tsinghua University Department of Applied Mechanics and Aerospace Engineering Waseda University

Many industrial applications and experiments have shown that sliding bearings often experience fluid film whip due to nonlinear fluid film forces which can cause rotor-stator rub-impact failures. The oil-film whips have attracted many studies while the water-film whips in the water lubricated sliding bearing have been little researched with the mechanism still an open problem. The dynamic fluid film forces in a water sliding bearing are investigated numerically with rotational, whirling and squeezing motions of the journal using a nonlinear model to identify the relationships between the three motions. Rotor speed-up and slow-down experiments are then conducted with the rotor system supported by a water lubricated sliding bearing to induce the water-film whirl/whip and verify the relationship. The experimental results show that the vibrations of the journal alternated between increasing and decreasing rather than continuously increasing as the rotational speed increased to twice the first critical speed, which can be explained well by the nonlinear model. The radial growth rate of the whirl motion greatly affects the whirl frequency of the journal and is responsible for the frequency lock in the water-film whip. Further analysis shows that increasing the lubricating water flow rate changes the water-film whirl/whip characteristics, reduces the first critical speed, advances the time when significant water-film whirling motion occurs, and also increases the vibration amplitude at the bearing center which may lead to the rotor-stator rub-impact. The study gives the insight into the water-film whirl and whip in the water lubricated sliding bearing.

关键词： rotor system sliding bearing vibration water-film whip nonlinear

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Expression of the tumor suppressor gene maspin and its significance in intraductal papillary mucinous neoplasms of the pancreas

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Hepatobiliary & Pancreatic Diseases International 2008年第1期7卷 86-90页

作者： Kyoko Kashima Nobuyuki Ohike seishiro Mukai Masashi Sato Manabu Takahashi Toshio Morohoshi Department of Pathology Showa University School of Medicine Department of Internal MedicineShowa University Toyosy Hospital Department of Pathology Showa University School of Medicine Department of Pathology Showa University School of Medicine Department of SurgeryShowa University School of Medicine Division of Pathology Ebara HospitalTokyo Japan

BACKGROUND: Maspin is a member of the serpin family of protease inhibitors and is thought to inhibit carcinoma invasion, metastasis, and angiogenesis and induce apoptosis. We examined maspin expression immunohistochemically and assessed its significance in intraductal papillary mucinous neoplasm (IPMN) of the pancreas. METHODS: We examined 39 surgically resected specimens of IPMN that included 17 adenomas (IPMAs), 5 borderline tumors (IPMBs), 4 non-invasive carcinomas (non-invasive IPMCs), and 13 invasive carcinomas (invasive IPMCs). Immunostaining was performed according to the EnVision ChemMate method. The degree of maspin expression was scored and assessed according to the percentage and staining intensity of positive cells. RESULTS: Maspin expression was minimal in normal pancreatic duct epithelium, whereas in IPMNs, maspin was expressed in neoplasms of all stages. Maspin expression increased with increasing grade from IPMAs, IPMBs, to non-invasive IPMCs but decreased significantly in invasive IPMCs. No specific association between maspin expression and mucin type was found. Analysis of maspin expression with respect to clinicopathologic factors in cases of invasive IPMC revealed a greater extent of invasion in cases of low maspin expression and significantly fewer apoptotic cells in the ***: Maspin was expressed at high levels in IPMNs at various stages from adenoma to invasive carcinoma, and our results suggest that maspin may be involved in the occurrence and progression of IPMN. In addition, our data suggest that the apoptosis-inducing action of maspin suppresses invasion and progression of IPMN.

关键词： maspin intraductal papillary mucinous neoplasm pancreas apoptosis immunohistochemistry

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Suppression of Log-Normal Distributed Weather Clutter Observed by an S-Band Radar

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Wireless Engineering and Technology 2013年第3期4卷 125-133页

作者： Shuji Sayama seishiro Ishii Department of Communications Engineering National Defense Academy Yokosuka Japan Department of Information Networks Sendai National College of Technology Sendai Japan.

We have observed weather clutter containing targets (ships) using an S-band radar with a frequency 3.05 GHz, a beam width 1.8°, and a pulsewidth 0.5 μs. To investigate the weather clutter amplitude statistics, we introduce the Akaike Information Criterion (AIC). We have found that the weather clutter amplitudes obey the log-normal, Weibull, and log-Weibull distributions with the shape parameters of 0.308 to 0.470, 4.42 to 4.51, and 15.91 to 16.44, respectively, for small data within the beam width of an antenna. We have proposed the log-normal/CFAR circuit modified a Cell-Averaging (CA) LOG/CFAR circuit. It is found that weather clutter is suppressed with improvement of 51.58 dB by log-normal/CFAR. As a result, we have showed that weather clutter observed by S-band radar does not obey the Rayleigh distribution and our log-normal/CFAR circuit has an effect on suppression of clutter and detection of target, while conventional LOG/CFAR circuit does not. In addition, if our circuit can be realized, we will have an advantage economically.

关键词： CFAR S-Band Radar Weather Clutter Log-Normal Distribution

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Measurement of Rain Attenuation in Terahertz Wave Range

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Wireless Engineering and Technology 2011年第3期2卷 119-124页

作者： seishiro Ishii Syuji Sayama Toshihisa Kamei 不详

Rain attenuation at 355.2 GHz in the terahertz wave range was measured with our new 355.2 GHz measuring system under rainfall intensities up to 25 mm/hr. Rain attenuation coefficients were also calculated using four raindrop-size distributions, e Marshall-Palmer (M-P), Best, Polyakova-Shifrin (P-S) and Weibull distributions, and using a specific rain attenuation model for prediction methods recommended by ITU-R. Measurements of a terahertz wave taken at 355.2 GHz were compared with our calculations. Results showed that the propagation experiment was in very good agreement with a calculation from a specific attenuation model for use in prediction method recommended by ITU-R.

关键词： Terahertz Wave Rain Attenuation Raindrop-Size Distribution M-P Distribution Weibull Distribution ITU-R

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Effect of Changes in Sea-Surface State on Statistical Characteristics of Sea Clutter with X-Band Radar

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Wireless Engineering and Technology 2011年第3期2卷 175-183页

作者： seishiro Ishii Syuji Sayama Koichi Mizutani Department of Communications Engineering National Defense Academy Yokosuka Japan Department of Intelligent Interaction Technology University of Tsukuba Tsukuba Japan

We have made observations of X-band radar sea clutter from the sea surface and sea-surface state in the Uraga Suido Traffic Route, which is used by ships entering and leaving Tokyo Bay, and the nearby Daini Kaiho Sea Fortress. We estimated the distributions of reflected amplitudes due to sea clutter using models that assume Weibull, Log-Weibull, Log-normal, and K-distributions. We then compared the results of estimating these distributions with sea-surface state data to investigate the effects of changes in the sea-surface state on the statistical characteristics of sea clutter. As a result, we showed that observed sub-ranges not containing a target conformed better to the Weibull distribution regardless of Significant Wave Height (SWH). Further, sub-ranges conforming to the Log-Weibull or Log-normal distribution in areas contained a target when the SWH was large, and as SWH decreases, sub-ranges conforming to a Log-normal. We also showed that for observed sub-ranges not containing a target, the shape parameter, c, of both Weibull and Log-Weibull distribution correlated with SWH. The correlation between wave period and shape parameters of Weibull and Log-Weibull distribution showed a weak correlation.

关键词： X-Band Radar Sea Clutter Significant Wave Height Weibull Distribution Log-Normal Distribution

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A Linear Array Antenna of Microstrip Patch Antennas Fed by the Open-End of Coplanar Waveguides

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Wireless Engineering and Technology 2017年第2期8卷 37-49页

作者： Toshihisa Kamei Hiromi Shima Syotaro Fukuda seishiro Ishii Department of Communications Engineering National Defense Academy Yokosuka Japan Kamakami Architecture Design and Quantity Surveying Office Yamagata Japan

In this study, we constructed a 4-element linear array antenna using four 20 GHz band microstrip patch antennas with a structure such that the signal is fed to the patch antennas from open-end coplanar waveguides without contact. We investigated factors related to the design of linear array patch antennas. To adjust the maximum radiation direction and reduce return loss, we optimized the spacing between the elements and their shape. With an element spacing of 11.50 mm, patch width of 3.90 mm, and patch length of 4.15 mm, we obtained a resonance frequency of 20.05 GHz and a return loss of -29.59 dB at the resonance frequency. However, in the case of a 4-element linear array antenna structure, undesired resonances occurred in frequency bands other than the design resonance frequency band of 20 GHz. To suppress these undesired resonances and obtaining stable operation at the design frequency, we propose a new structure in which the feed line is loaded with a short stub, and show through computer simulations that the occurrence of undesired resonances can be sufficiently suppressed. Furthermore, we demonstrate the problem of radiation gain reduction caused by introducing a short stub, propose a design method for a new structure in which the feed line has slits between the stubs, and show improvement of the antenna gain by 0.5 dBi.

关键词： Microstrip Patch Antenna Coplanar Waveguide Linear Array Antenna Short Stub Undesired Resonance Suppression

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Two-and Three-Layered Dissolving Microneedles for Transcutaneous Delivery of Model Vaccine Antigen in Rats

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Journal of Biomaterials and Nanobiotechnology 2012年第3期3卷 325-334页

作者： Asuka Ikejiri Yukako Ito seishiro Naito Kanji Takada Department of Pharmacokinetics Kyoto Pharmaceutical University Kyoto Japan Department of Safety Research on Blood and Biological Products National Institute of Infectious Diseases Tokyo Japan.

Purpose: Comparison of transcutaneous immunization of ovalbumin (OA) between two-and three-layered dissolving microneedles (MN) in rats. Methods: We prepared 500 μm long two-layered and three-layered dissolving microneedle (2-MN and 3-MN, respectively) arrays from chondroitin sulfate as the base, and OA as the model antigen. The 2-MN containing OA at the acral portion and 3-MN with OA at the second portion were administered to rat skin transcutaneously. As a positive control, OA solution was injected subcutaneously (sc). The OA delivery and diffusion in the rat skin were studied using confocal microscopy with fluorescein-conjugated OA (FL-OA). Results: The formulated positions of OA were 0-155 ± 5 μm for 2-MN and 175 ± 4 – 225 ± 5 μm for 3-MN. The administered doses of OA were 2.2 ± 0.1 μg, 12.0 ± 0.2 μg and 22.0 ± 0.2 μg for 2-MN, 1.8 ± 0.2 μg, 12.6 ± 0.7 μg, and 20.4 ± 0.3 μg for 3-MN, 10 μg, 100 μg and 1000 μg for sc injection. At 4 weeks after the first administration, 3-MN showed about 2.5-7.0 fold and 5.4 fold higher total Ig (G + A + M) antibody than 2-MN and sc injection of the OA solution. Conclusions: The 3-MN, which delivered OA to the epidermis, is a useful drug delivery system for transcutaneous antigen delivery.

关键词： Dissolving Microneedles (Mns) Two-Layered Mns Three-Layered Mns Transcutaneous Vaccine Ovalbumin Fl-Ovalbumin (Fl-Oa)

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Rain Attenuation in the Microwave-to-Terahertz Waveband

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Wireless Engineering and Technology 2016年第2期7卷 59-66页

作者： seishiro Ishii Masahiro Kinugawa Shunichiro Wakiyama Shuji Sayama Toshihisa Kamei Department of Information Networks National Institute of Technology Sendai College Sendai Japan Department of Communication Engineering National Defense Academy Yokosuka Japan

In recent years, there has been increased interest in the terahertz waveband for application to ultra-high-speed wireless communications and remote sensing systems. However, atmospheric propagation at these wavelengths has a significant effect on the operational stability of systems using the terahertz waveband, so elucidating the effects of rain on propagation is a topic of high interest. We demonstrate various methods for calculating attenuation due to rain and evaluate these methods through comparison with calculated and experimental values. We find that in the 90 - 225 GHz microwave band, values calculated according to Mie scattering theory using the Best and P-S sleet raindrop size distributions best agree with experimental values. At 313 and 355 GHz terahertz-waveband frequencies, values calculated according to Mie scattering theory using the Weibull distribution and a prediction model following ITU-R recommendations best agree with experimental values. We furthermore find that attenuation due to rain increases in proportion to frequency for microwave-band frequencies below approximately 50 GHz, but that there is a peak at around 100 GHz, above which the degree of attenuation remains steady or decreases. Rain-induced attenuation increases in proportion to the rainfall intensity.

关键词： Terahertz Wave Microwave Rain Attenuation Weibull Distribution ITU-R

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Millimeter-Wave Absorption Properties of Thin Wave Absorber in Free Space with New Porous Carbon Material

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Wireless Engineering and Technology 2017年第3期8卷 51-58页

作者： Toshihisa Kamei Hiromi Shima Takashi Yamamoto Satoshi Ogino seishiro Ishii Department of Communications Engineering National Defense Academy Yokosuka-shi Japan Department of Materials Science Osaka Prefecture University Osaka Japan Microwave Absorbers Inc. Tokyo Japan KamakamiArchitecture Design and Quantity Surveying Office Yamagata Japan

In this paper, we focus on PHYTOPOROUS, a porous carbon material made entirely from plant-based ingredients, as a new broadband-wave absorber material that acts in the millimeter wave band. We created prototypes of thin rubber-sheet wave absorbers that contain porous carbon (PHYTOPOROUS) made from rice chaff and soybean hulls, which are both agricultural residue products that are generated in large quantities. We investigated the permittivity and reflectance characteristics of this material using the free-space time-domain method. The thin rubber-sheet wave absorber that contained PHYTOPOROUS made from soybean hulls exhibited a frequency band that was approximately 18 GHz wide and centered at 90 GHz. The return loss for this material was greater than −20 dB. This demonstrates that the material provides nearly constant reflection absorption over a wide frequency band.

关键词： Microwave Absorber Millimeter Wave Porous Carbon Material Free-Space Method Reflection Loss

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