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Hiroki Yamaguchi,Yasunao Matsumoto,Tsutomu Yoshioka 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.15 No.3
Structural health monitoring of steel truss bridge based on changes in modal properties wasinvestigated in this study. Vibration measurements with five sensors were conducted at an existing Warrentruss bridge with partial fractures in diagonal members before and after an emergency repair work. Modalproperties identified by the Eigensystem Realization Algorithm showed evidences of increases in modaldamping due to the damage in diagonal member. In order to understand the dynamic behavior of the bridgeand possible mechanism of those increases in modal damping, theoretical modal analysis was conductedwith three dimensional frame models. It was found that vibrations of the main truss could be coupledinternally with local vibrations of diagonal members and the degree of coupling could change with structuralchanges in diagonal members. Additional vibration measurements with fifteen sensors were then conductedso as to understand the consistency of those theoretical findings with the actual dynamic behavior. Modalproperties experimentally identified showed that the damping change caused by the damage in diagonalmember described above could have occurred in a diagonal-coupled mode. The results in this study implythat damages in diagonal members could be detected from changes in modal damping of diagonal-coupledmodes.
Yamaguchi, Hiroki,Matsumoto, Yasunao,Yoshioka, Tsutomu Techno-Press 2015 Smart Structures and Systems, An International Jou Vol.15 No.3
Structural health monitoring of steel truss bridge based on changes in modal properties was investigated in this study. Vibration measurements with five sensors were conducted at an existing Warren truss bridge with partial fractures in diagonal members before and after an emergency repair work. Modal properties identified by the Eigensystem Realization Algorithm showed evidences of increases in modal damping due to the damage in diagonal member. In order to understand the dynamic behavior of the bridge and possible mechanism of those increases in modal damping, theoretical modal analysis was conducted with three dimensional frame models. It was found that vibrations of the main truss could be coupled internally with local vibrations of diagonal members and the degree of coupling could change with structural changes in diagonal members. Additional vibration measurements with fifteen sensors were then conducted so as to understand the consistency of those theoretical findings with the actual dynamic behavior. Modal properties experimentally identified showed that the damping change caused by the damage in diagonal member described above could have occurred in a diagonal-coupled mode. The results in this study imply that damages in diagonal members could be detected from changes in modal damping of diagonal-coupled modes.
Yamaguchi, Hiroki,Gurung, Chandra B.,Yukino, Teruhiro Techno-Press 2005 Wind and Structures, An International Journal (WAS Vol.8 No.2
Wind-induced vibrations measured in the Tsuruga Test Line are characterized in this paper by single-channel data analysis based on piecewise application of Prony's method. Some of events were identified as galloping, while most of events were buffeting responses, which were confirmed partly by the buffeting analysis. Effects of end condition etc. on the response characteristics are also discussed.
Masaki Yamaguchi,Hiroki Yamamuro,Masayuki Takashiri 한국물리학회 2018 Current Applied Physics Vol.18 No.12
Bismuth telluride (Bi2Te3) thin films were prepared with various electrolyte temperatures (10°C–70 °C) and concentrations [Bi(NO3)3 and TeO2: 1.25–5.0 mM] in this study. The surface morphologies differed significantly between the experiments in which these two electrodeposition conditions were separately adjusted even though the applied current density was in the same range in both cases. At higher electrolyte temperatures, a dendrite crystal structure appeared on the film surface. However, the surface morphology did not change significantly as the electrolyte concentration increased. The dendrite crystal structure formation in the former case may have been caused by the diffusion lengths of the ions increasing with increasing electrolyte temperature. In such a state, the reactive points primarily occur at the tops of spiked areas, leading to dendrite crystal structure formation. In addition, the in-plane thermoelectric properties of Bi2Te3 thin films were measured at approximately 300 K. The power factor decreased drastically as the electrolyte temperature increased because of the decrease in electrical conductivity due to the dendrite crystal structure. However, the power factor did not strongly depend on the electrolyte concentration. The highest power factor [1.08 μW/(cm·K2)] was obtained at 3.75 mM. Therefore, to produce electrodeposited Bi2Te3 films with improved thermoelectric performances and relatively high deposition rates, the electrolyte temperature should be relatively low (30 °C) and the electrolyte concentration should be set at 3.75 mM.
Motion Analysis of Mother's Embracing and Rocking a Baby and Development of Excitation Apparatus
Kohei Yamaguchi,Hiroki Kobayashi,Yoshihumi Morita,Yuki Sakaida,Ryojun Ikeura,Kiyoko Yokoyama 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
Recently, the people who are under a lot of stress have increased. Too much stress may cause various physical and/or mental disorders. The final aim of our project is to develop a relaxation machine for reducing stress by using rocking vibration. As rocking vibration, motion of a mother"s embracing and rocking of a baby is adopted. In this paper, we analyze the motion of the mother"s embracing and rocking of a baby using a 3D motion capture system, and design and manufacture an excitation apparatus simulating the mother"s motions. It is found from the experimental analysis that there are two types of the mother"s motions. The both motions consist of linear motion and rotational motion. The excitation apparatus has two degrees-of freedom for linear and rotational motions.
Static behaviors of self-anchored and partially earth-anchored long-span cable-stayed bridges
Xie, Xu,Yamaguchi, Hiroki,Nagai, Masatsugu Techno-Press 1997 Structural Engineering and Mechanics, An Int'l Jou Vol.5 No.6
In this paper, three dimensional static behaviors of the self-anchored and partially earth-anchored cable-stayed bridges, with a span of 1400 meters, under wind loading are studied by using a 3D geometrical nonlinear analysis. In this analysis, the bridges both after completion and under construction are dealt with. The wind resistant characteristics of the both cable-stayed systems are made clear. In particular, the characteristics of the partially earth-anchored cable systems, which is expected to be a promising solution for extending the span of the cable-stayed systems further, is presented.
( Hitoshi Kuramae ),( Norio Tatsumi ),( Keiko Sugaki ),( Atsushi Naito ),( Hiroki Kawai ),( Ikuo Yamaguchi ),( Mitsuhiro Hori ),( Kazuhisa Inuzuka ) 대한임상병리사협회 2015 임상미생물검사학회 발표자료집 Vol.2015 No.-
Introduction Recently, several bacteria isolated in a clinical setting have drug-resistance, which has become a serious problem. Particularly, extended-spectrum β- lactamase (ESBL) producing Enterobacteriaceae(ESBLPE) have spread not only in-hospital infection but also community-acquired infection. In 2006, we established a meeting which is called "Mikawan-kai" for the purpose of establishment and the standardization of the method for detection criteria of ESBLPE with 17 institutions in east area of Aichi prefecture. We report about the situation and trend of ESBLPE detection in this area. Materials and Methods This study was carried out by 7 institutions (190-836 bed) in east area of Aichi prefecture from January to December in 2013. The judgment of ESBLPE was conducted by the routine method in each institution. Results The range of detection rates identified or suspected ESBLPE were E. coli : 8-13%, K. pneumoniae : 3-6%, K. oxytoca : 0-17%, and P. mirabilis : 6-22%, respectively. And the results of antimicrobial susceptibility tests of E. coli showed that the rates of resistance to CPDX, CTX, and CAZ, which were recommended as a screening of identification for ESBLPE, were 12-18%, 8-13%, and 2-6%. Discussion and conclusion The highest frequency of detection of ESBLPE was E. coli, which was about 10% in each institution and has been increasing as compared with that of previous research in 2009 (4-9%). The results of ESBLPE detection in K. oxytoca and P. mirabilis showed some differences among institutions. Resistance rate for antimicrobial drug seems to be higher in CPDX, which is lower in CAZ. The detection rate of ESBLPE has not steeply increased for recent 5 years, whereas it still accounts for a high rate. For the prevention to further expansion of ESBLPE in this area, we intend to develop our activity through standardization of detection methods and criterion of identification for ESBLPE and share information.
Impact of sarcopenia on biliary drainage during neoadjuvant therapy for pancreatic cancer
Kunio Kataoka,Eizaburo Ohno,Takuya Ishikawa,Kentaro Yamao,Yasuyuki Mizutani,Tadashi Iida,Hideki Takami,Osamu Maeda,Junpei Yamaguchi,Yukihiro Yokoyama,Tomoki Ebata,Yasuhiro Kodera,Hiroki Kawashima 대한소화기내시경학회 2024 Clinical Endoscopy Vol.57 No.1
Background/Aims: Since the usefulness of neoadjuvant chemo(radiation) therapy (NAT) for pancreatic cancer has been demonstrated, recurrent biliary obstruction (RBO) in patients with pancreatic cancer with a fully covered self-expandable metal stent (FCSEMS) during NAT is expected to increase. This study investigated the impact of sarcopenia on RBO in this setting. Methods: Patients were divided into normal and low skeletal muscle index (SMI) groups and retrospectively analyzed. Patient characteristics, overall survival, time to RBO (TRBO), stent-related adverse events, and postoperative complications were compared between the two groups. A Cox proportional hazard model was used to identify the risk factors for short TRBO. Results: A few significant differences were observed in patient characteristics, overall survival, stent-related adverse events, and postoperative complications between 38 patients in the normal SMI group and 17 in the low SMI group. The median TRBO was not reached in the normal SMI group and was 112 days in the low SMI group (p=0.004). In multivariate analysis, low SMI was the only risk factor for short TRBO, with a hazard ratio of 5.707 (95% confidence interval, 1.148–28.381; p=0.033). Conclusions: Sarcopenia was identified as an independent risk factor for RBO in patients with pancreatic cancer with FCSEMS during NAT.