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Quasi-Zenith Satellite System (QZSS)-Outline and its time related mission
Hama, shinichi,Takahashi, Yasuhiro,Amagai, Jun,Ito, Hiroyuki,Morikawa, Takao,Yokota, Shouichirou,Fujieda, Miho,Kimura, Kazuhiro 통신위성우주산업연구회 2005 Joint Conference on Satellite Communications Vol.2005 No.-
Japan has started a project of Quasi-Zenith Satellite System (QZSS) since FY2003. QZSS will be highly useful not only for communications but for complement of the modernized GPS in urban canyon and mountainous area with its high visibility brought out by its inclined orbits. National Institute of Information and Communications Technology, Japan (NICT) is to develop a Space-borne Hydrogen Maser (SHM) and time management system, and carry out experiments using them. A breadboard model (BBM) of the SHM was developed to overcome the issues such as size, weight and life time, which are required in space environment. Basic design was carried out for time management system to achieve nano second level time transfer. The design and the manufacturing of the engineering models (EM) of the on-board equipment have been carried out since 2004. The first satellite is planned to be launched in FY 2008.
Evaluation of On-Board Ship Handling Training Using Salivary Amylase Activity
Kousaku Hama,Yui Matsuo,Koji Murai,Laurie C.Stone,Shin-ichi Wakida,Takashi Miyado,Keiichi Fukushi,Yuji Hayashi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In Japan, an evaluation of on-board ship handling training depends on professionals who have a lot of experience on board. This style is common for human skill practices worldwide. However, it is difficult for a cadet to understand his progress, because real ship training includes every distraction; the same case never happens in his student life. On the other hand, the knowledge is easy to learn. We are looking for an evaluation method to support instructors’teaching methods and cadets’ progress. Salivary amylase activity shows stress levels in cadets, and we can measure it for one minute. This paper shows the cadet’s and the instructor’s salivary amylase activity together and demonstrates that the salivary amylase activity is a useful index.
Katsuhiro Hama 한국방사성폐기물학회 2013 방사성폐기물학회지 Vol.11 No.2
미즈나미 지하처분연구시설 프로젝트는 일본원자력연구개발기구가 결정질암 내의 심부 지하 환경에 관해 종 합적으로 연구하는 프로젝트이다. 미즈나미 프로젝트는 3개의 중첩되는 단계로 구성된다: 지표기반 조사단계 (단계 1), 건설단계 (단계 2), 운영단계 (단계 3)의 총 20년. 미즈나미 프로젝트의 1단계에서 3단계까지의 전체 목표는 1) 심부지질환경을 조사, 분석, 평가하기 위한 기술 정립, 2) 심부 지하 활용을 위한 일련의 공학적 기 술 개발이다. 전체 목표 1을 달성하기 위하여, 1단계 목표를 굴착 전에 지질환경을 모사하고 굴착거동을 예측 하는 모든 지표기반 조사결과로부터 지질환경 모델을 구축하는 것으로 설정하였다. 전체 목표 2를 달성하기 위하여, 2단계 목표는 지하시설을 위한 상세 설계 개념과 건설 계획을 수립하는 것으로 설정하였다. 본 논문은 결정질암내 지하수의 수리지화학적 특성을 조사하고 평가하기 위한 지질통합적 방법을 소개한다.
Novel and Compact Thermomagnetic Actuator Using Temperature-Sensitive Magnetic Materials
Tadashi Hama,Kaiji Sato 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.12
This paper describes the structure and characteristics of a novel compact actuator that uses a combination of temperature-sensitive magnetic materials (TSMMs) and permanent magnets (PMs). The actuator has the potential to generate a large force per volume, while the absence of a coil structure makes it easy to downsize. The structure and driving principles of the actuator were determined to exploit the advantages of this combination, and thrust force characteristics were examined through numerical analysis. The thrust force generated was measured based on the temperature of the TSMMs. The temperature characteristics were investigated experimentally and theoretically. In addition to thrust force, the energy consumption was experimentally examined with respect to the TSMM temperature. The results indicate that the proposed actuator performed better than a conventional electromagnetic actuator in generating a large continuous thrust force.
Small Left Atrium: An Adjunctive Sign of Hemodynamically Compromised Massive Pulmonary Embolism
Yukihiro Hama,Tadayuki Yakushiji,Yoshie Iwasaki,Tatsumi Kaji,Naoei Isomura,Shoichi Kusano 연세대학교의과대학 2005 Yonsei medical journal Vol.46 No.5
Pulmonary embolism (PE) is a common disease with a high mortality rate due to right ventricular dysfunction and underfilling of the left ventricle. We present a case of a 33-year-old man with hemodynamically compromised massive PE. His left atrium was collapsed with marked dilatation of the right atrium and ventricle on multi-detector-row CT scans. The patient was treated with an intracatheter injection of a mutant tissue-type plasminogen activator and subsequently showed clinical and radiological improvements. The small left atrial size in combination with a right ventricular pressure overload was considered to be an adjunctive sign of hemodynamically compromised massive PE.
Prediction of Yield Loci for a Magnesium Alloy Sheet using Crystal-Plasticity Finite-Element Method
Takayuki HAMA,Hitoshi FUJIMOTO,Hirohiko TAKUDA 한국소성가공학회 2011 기타자료 Vol.2011 No.8
This paper presents the prediction of yield loci for an AZ31 magnesium alloy sheet using a rate-dependent crystal-plasticity finite-element method. A differential work-hardening behavior was clearly observed; the contour of plastic work was initially rather flattened in the vicinity of equi-biaxial tension, but thereafter severely bulged. The variation of the relative activity of each family of slip systems was examined to investigate the mechanism of the differential work-hardening behavior. During uniaxial tension, the work hardening was determined mainly by the basal slip in the very beginning, while by both the prismatic slip and the basal slip in the subsequent deformation. On the other hand, during equi-biaxial tension, the activity of the basal slip systems was predominant throughout the deformation, while the relative activity of the prismatic slip systems was smaller than that in the uniaxial tension. We concluded that this difference in the relative activities of the slip systems depending on the biaxial-stress ratio eventually resulted in the differential work-hardening behavior of the contour of plastic work. The mechanism that the activity of the prismatic slip systems decreased as the biaxial-stress ratio approached to one was also discussed using a simple analytical model.
Crystal Plasticity Finite Element Analysis of Loading-Unloading Behaviour in Magnesium Alloy Sheet
Takayuki Hama,Hitoshi Fujimoto,Hirohiko Takuda 한국소성가공학회 2010 기타자료 Vol.2010 No.6
Magnesium alloy sheets exhibit strong inelastic response during unloading. In this study crystal plasticity finite element analysis of loading-unloading behaviour during uniaxial tension in a rolled magnesium alloy sheet was carried out, and the mechanism of this inelastic response was examined in detail in terms of macroscopic and mesoscopic deformations. The unloading behaviour obtained by the simulation was in good agreement with the experiment in terms of variation with stress of instantaneous tangent modulus during unloading. Variations of activities of each family of slip systems during the deformation showed that the activation of basal slip systems is the largest during unloading, and the slip direction during unloading is opposite from during loading. These results indicated that one of the factors of the inelastic behaviour during unloading is the fact that the basal slip systems are easily activated during unloading because of their low strengths.