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RISS 인기검색어
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- 저자 : Toshiya Nakamura (검색결과 6 건)
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Aeronautical Research Activities For Civil Transport in JAXA
Toshiya Nakamura 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
One of the goals of JAXA’s Aviation Program Group (APG) is to develop the cutting-edge technologies and make them available in the development of competitive aircraft in the world market. To achieve this, JAXA launched a research project in 2003 which covers wide variety of aeronautical science and technology: computational fluid dynamics (CFD), advanced optical measuring methods in wind tunnel test, aero-acoustic analysis (computational aero-acoustics, CAA) to reduce airframe noise, computational tool to analyze transonic flutter behavior, analysis and test of crashworthiness, composite materials and structures, and control systems. This article describes JAXA’s efforts conducted in the project in some details. Some of these activities have been contributing to the development of MRJ, the first jet passenger aircraft under development in Japan.
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Toshiya Nakamura 한국언론학회 2009 한국언론학회 심포지움 및 세미나 Vol.2009 No.8-2
Newspapers are in crisis on a global scale; Japan's newspaper publishers that have been known as a giant are also in adversity. Diffusion of the new media is altering how people consume the news. Readership of newspapers in Japan is in a continuous downward trend. Also, digital technologies challenge Japan's newspapers to reconsider their way of news flows, production and distribution. Additionally, the global economic crisis that emerged since last year prompted Japanese major industries to reduce their advertisement on newspapers. Accordingly, financial states of newspaper publishers were influenced because of reduction of advertisement incomes, and some major publishers, including Asahi Shimbun, one of the most influential national dailies, went into the red for the first time. Thus, newspapers are confronted with the strongest challenge in decades and are forced to grapple with restructuring. This paper firstly reviews the crisis with which Japan's newspapers are now faced. It then analyses the factors of difficulties both in the long and short terms, by highlighting demographic trends and changing behaviour of news consumption. The article also illustrates newspaper publishers' restructuring efforts in terms of news production and distribution. By doing so, the paper discusses the prospect whether and how the newspaper industry might overcome the crisis.
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Electroluminescence from n-Zn(Mg,Cd)O/ p-4H-SiC:Al Heterojunctions
Kenji Yamamoto,Toshiya Ohashi,Atsushi Nakamura,Temmyo Jiro 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Electroluminescence (EL) from n-Mg0:18Zn0:82O/ n-Zn(Mg,Cd)O/ p-4H-SiC:Al heterojunction diodes fabricated by using remote-plasma-enhanced metal-organic chemical-vapor deposition was measured to investigate some recombination processes of hole injection by changing the bandgap of n-Zn(Mg,Cd)O. EL emissions from the heterojunction utilizing n-Zn1-xCdxO (x > 0.07) were observed to coincide with the photoluminescence (PL) emission energy of the corresponding alloy content due to hole injection from the p-4H-SiC:Al to the n-Zn1-xCdxO layer in the type-I het-erojunctions. However, broad EL emissions from the type-II heterojunctions utilizing n-ZnO and n-Mg0:12Zn0:88O were observed at around 2.8 eV. These broad ELs were caused by the recombination of carriers in p-4H-SiC:Al due to electron injection from n-Zn(Mg,Cd)O to p-4H-SiC:Al and by the recombination of spatially separated carriers at the heterointerface.
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Saito, Yoko,Nakamura, Toshiya,Urushizaka, Mayumi,Kitajima, Yu,Itaki, Chieko,Terashima, Shingo,Hosokawa, Yoichiro The Korean Association for Radiation Protection 2016 방사선방어학회지 Vol.41 No.4
Background: Although nuclear disaster is considered rare, its effects are serious, and we must prepare a system to enable an effective response. Materials and Methods: Since 2010, we have been offering a two-day seminar to provide current nurses and radiological technologists with basic knowledge and train them in radiation emergency medicine (REM) techniques. This training offers lectures to deepen each specialty from the perspective of REM, as well as exercises on ways to handle irradiated and/or contaminated patients. Participants were expected to treat patients according to the concept of REM. Results and Discussion: All participants learn to assess and decontaminate contaminated wounds through drills. The questionnaire survey for participants indicated that participants were satisfied with this training and wanted to attend again. Conclusion: We believe that this training course will provide a valuable opportunity for medical professionals to gain knowledge and expertise in REM.
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Fabrication and EL Emission of ZnO-Based Heterojunction Light-Emitting Devices
Sandip Gangil,Atsushi Nakamura,Kenji Yamamoto,Toshiya Ohashi,Jiro Temmyo 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1
Nitrogen-doped p-type MgZnO films were successfully realized on a-plane sapphire substrates and were used in an n-MgyZn1-yO/n-Zn1-xCdxO/p-MgyZn1-yO:N/p-SiC heterojunction structure to act as barrier layer leading to sharpening of the electroluminescence (EL) in terms of reducing the full width at half maximum (FWHM). The X-ray photoelectron spectroscopy (XPS) analysis of the c-axis-oriented nitrogen-doped MgZnO film confirmed the presence of Mg2+ at 49.8 eV in Mg (2p region) in the ZnO:N lattice, replacing Zn2+. Zn-N formations were clearly visible in the Zn (2p3=2) region and the signal for nitrogen-replacing oxygen (NO) emerged at 396.9 eV. With respect to ZnO:N polar films (n-type in as-grown conditions), as-grown polar MgZnO:N films had the upper hand by holding a p-type nature due to Mg incorporation ascribed to the formation of Mg- related (interactions of Mg with N) tri-atomic acceptor-donor-acceptor-configured p-type supportive complexes. The nitride formations were noticeable in the X-ray diffraction (XRD) spectra. The formation of complexes and their effects are discussed in this paper. Nitrogen-doped p-type MgZnO films were successfully realized on a-plane sapphire substrates and were used in an n-MgyZn1-yO/n-Zn1-xCdxO/p-MgyZn1-yO:N/p-SiC heterojunction structure to act as barrier layer leading to sharpening of the electroluminescence (EL) in terms of reducing the full width at half maximum (FWHM). The X-ray photoelectron spectroscopy (XPS) analysis of the c-axis-oriented nitrogen-doped MgZnO film confirmed the presence of Mg2+ at 49.8 eV in Mg (2p region) in the ZnO:N lattice, replacing Zn2+. Zn-N formations were clearly visible in the Zn (2p3=2) region and the signal for nitrogen-replacing oxygen (NO) emerged at 396.9 eV. With respect to ZnO:N polar films (n-type in as-grown conditions), as-grown polar MgZnO:N films had the upper hand by holding a p-type nature due to Mg incorporation ascribed to the formation of Mg- related (interactions of Mg with N) tri-atomic acceptor-donor-acceptor-configured p-type supportive complexes. The nitride formations were noticeable in the X-ray diffraction (XRD) spectra. The formation of complexes and their effects are discussed in this paper.
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