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PBL Based Engineering Education to Cultivate Leadership Spirit in Postgraduate Students
Kazutaka Yokota,Masatomo Maruoka,Junji Takaki,Shinichi Watanabe 한국공학교육학회 2012 공학교육연구 Vol.15 No.5
Utsunomiya University started a 3-year project to develop an education program for postgraduate students to cultivate leadership spirits. The program is centered on a PBL in which each group of students is required to find an engineering or social problem themselves and start a project to solve the problem. Projects vary widely, from a straight product development to a summer program for children or local area development. Student groups are advised by senior engineers from industries. They give advice as to how a project should be managed and run, but will not give instructions. The PBL is compulsory for all students in the engineering master course students. The new education program also includes a series of lectures by engineers to show engineers’ job, activities, and career in the industry. Internship programs are also provided, in which students will be given opportunities to actively apply their knowledge and skills to real engineering tasks offered by the industry. The students are expected to gain something more than just experiences.
Avalanche-like Quenches in Cable in Conduit Conductors
Kazutaka Seo,Arata Nishimura,Yoshimitsu Hishinuma 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Superconducting conductors carrying large currents of more than several tens of kA are required for magnetic confinement fusion apparatuses. A cable-in-conduit conductor (CICC), which has around a thousand parallel and twisted thin superconducting strands in a stiff conduit, is a promising candidate for such large and high-magnetic-field superconducting systems. We developed a numerical code AQUAPS (Avalanche-like QUench Analysis for Parallel Superconducting strands) simulating electromagnetic and thermal phenomena in a conductor consisting of parallel superconducting strands. A specific phenomenon in the CICC is so-called avalanche-like quench. When one strand becomes resistive due to current saturation or a mechanical disturbance, e.g. frictional heating, it loses the transport current and the current re-distributes into neighboring strands. Neighboring strands are electromagnetically well coupled and electrically contact each other. Therefore, neighboring strands receive supplemental current from the original strand and this results in a following quench. We call this phenomenon ’avalanche-like quench’. With the newly developed numerical code AQUAPS, we have simulated quenches in multi-strand cables with both Nb3Sn and NbTi strands and compared these. For the Nb3Sn cable, the critical temperature (Tc) may be much larger than the liquid-helium bath temperature (T0), in spite of the fact that current sharing temperature (Tcs) is almost equal to T0. This situation is very different from that in the NbTi cable. We analyzed this issue intensively and present some discussion.0chh9mu
A Bureaucrat’s Vision of a Modernized Japan
Kazutaka Kojima 계명대학교 사회과학연구소 2018 한국사회과학연구 Vol.37 No.1
In this paper I present a picture of Sensai Nagayo, the first Director of the Central Hygiene Bureau in the Home Ministry. Today Nagayo is well known as the first Director of the Bureau, but in fact, researchers do not know how he understood the Western-style public health system, and what kind of public health system he envisaged. Nagayo recognized the importance of the public health system for a modernized Japan. The system he discovered was sanitation or Gesundheitspflege. When Nagayo realized their importance, he proposed seimu- teki- unyo (the application of policies) based on medical science and associated sciences (e.g., natural science, engineering, meteorology, statistics). During the implementation of these health protection policies, Nagayo started to think two functions were important: the first one being the government, which was led by staff in towns and villages, police officers, and doctors under the Home Ministry; and the second being the residents or Eisei kumiai (the association for public health in each area). In conclusion, Nagayo realized he had to work on the creation of a cooperative system between the government and the residents. Public health for a modernized Japan was formed out of the bureaucratic vision of a technocratic government official, Sensai Nagayo.
A Detection of Airborne Particles Carrying Viable Bacteria in an Urban Atmosphere of Japan
Kazutaka Hara,Daizhou Zhang,Maromu Yamada,Hiromi Matsusaki,Koji Arizono 한국대기환경학회 2011 Asian Journal of Atmospheric Environment (AJAE) Vol.5 No.3
Viable bacteria on water-insoluble airborne particles were detected in the urban atmosphere of Kumamoto (134^ㅇ45′E, 32^ㅇ28′N), Japan, in autumn 2008. Airborne particles were collected onto film-covered Cu meshes under clear weather conditions. The samples were stained by fluorescent stains, and then viewed and photographed with an epifluorescent microscope. Non-biological and bacterial parts in particles larger than 0.8 μm were distinguished by their morphologies,fluorescent colors and fluorescent intensities. Bacterial viable statuses were discriminated according to cell membrane damage. In total, 2681 particles were investigated and it was found that 78 airborne particles were associated with bacteria. Viable bacteria were identified on 48 particles. A few particles carried multiple viable bacteria. These results provide the evidence that airborne particles act as carriers of viable bacteria in the atmosphere.