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백태경 ( Tae Kyung Baek ),山下三平 ( Sampei Yamashita2 ) 한국지리정보학회 2013 한국지리정보학회지 Vol.16 No.1
본 연구는 아시아 각국 중 활발히 경관계획이 수립되고 있는 일본과 우리나라를 대상으로 경관데이터베이스를 구축함과 동시에 경관제도를 비교하고 분석함을 목적으로 했다. 경관법 제정후의 우리나라의 경관법(2008.3)과 일본의 경관법(2004.6) 그리고 그 조례와 시행사례를 한국과 일본을 대상으로 비교하여 특징을 파악했다. 일본에서는 2010년 12월 1일 현재 472개의 지자체가 경관행정단체이며 우리나라는 2010년 3월 1일 현재 83지자체가 경관행정단체임을 알 수있었다. 한일 양국의 경관법은 전체적으로 보면 유사한 구조로 구성되어 있으나 우리나라의 경우 부칙과 벌칙규정이 없고 일본의 경관법에는 경관지구조항이 있다는 점 등이 특징이라 할 수 있다. 본 연구에서 도출된 결과들은 앞으로 동아시아지역의 경관계획 또는 경관제도의 확립 및 발전에 기초자료로서 활용할 수 있으리라 기대된다. This study is to compare and analyze the current status of landscape planning system in Korea and Japan by establishing the landscape database utilizing geographic information system(GIS). Specifically, landscape laws and their ordinances enacted in Korea and Japan and their implementation cases were compared to identify the characteristics. As of December 1, 2010, landscape administrative bodies are composed of 472 local governments in Japan while as of March 1, 2010, they are 83 local governments in Korea. The landscape laws in Korea and Japan have a similar structure overall. However, there are no supplementary provision and penal provision in the Korean landscape law whereas there is landscape district provision in the Japanese landscape law. The results of this study would be used as a base for building up the landscape planning and policy in the East Asian region.
Effect of ammonia treatment on white birch wood
Yamashita, Daichi,Kimura, Satoshi,Wada, Masahisa,Samejima, Masahiro,Takabe, Keiji Walter de Gruyter und Co 2018 Holzforschung Vol.72 No.1
<P><B>Abstract</B></P><P>Transverse sections of white birch (<I>Betula platyphylla</I>) were treated with anhydrous ammonia at 60-140°C (ammonia treatment, AT). As a result, the crystal structure of cellulose in the AT samples changed to cellulose III<SUB>I</SUB>, and acetamide was produced. The surface area of the AT samples, the amount of sugar released upon acid hydrolysis and the lignin content were not changed. However, a small amount of lignin became acid soluble. Mäule color reaction, indicative of the presence of syringyl lignin, showed decreasing color intensities with increasing temperature of AT. The results can be easily interpreted that AT affects ester linkages and side chains of hemicelluloses and syringyl lignin. In addition, AT was carried out on 1-μm thick transverse sections and block specimens. Xylanase treatment and immunolabeling revealed that AT enhances xylan degradation, but ray cells are resistant to xylanase even after AT. On the block sample, a deposited xylan layer appeared on the inner surface of fiber cell walls. Apparently, xylan moved to the surface in contact with the fluid ammonia during AT. The vessel cell wall did not show a similar migration effect, indicating a cell wall-specific interaction with ammonia.</P>
Yamashita, Hiromi,Kawasaki, Shinichi,Ichihashi, Yuichi,Takeuchi, Masato,Harada, Masaru,Anpo, Masakazu,Louis, Catherine,Che, Michel 한국화학공학회 1998 Korean Journal of Chemical Engineering Vol.15 No.5
Titanium-silicon (Ti/Si) binary oxides having different Ti content were prepared by the sol-gel method and utilized as photocatalysts for the hydrogenation and hydrogenolysis of CH₃CCH with H₂O. The photocatalytic reactivity and selectivity of these catalysts were investigated as a function of the Ti content and it was found that the hydrogenolysis reaction (C₂H_6 formation) was predominant in regions of low Ti content, while the hydrogenation reaction (C₃H_6 formation) proceeded in regions of high Ti content. The in situ photoluminescence, diffuse reflectance absorption, FT-IR, XAFS (XANES and EXAFS), and XPS spectroscopic investigations of these Ti/Si binary oxides indicated that the titanium oxide species are highly dispersed in the SiO₂ matrices and exist in a tetrahedral coordination exhibiting a characteristic photoluminescence spectrum. The charge transfer excited state of the tetrahedrally coordinated titanium oxide species plays a significant role in the efficient photoreaction with a high selectivity for the hydrogenolysis of CH₃CCH to producea mainly C₂H_6, and CH₄, while the catalysts involving the aggregated octahedrally coordinated titanium oxide species show a high selectivity for the hydrogenation of CH₃CCH to produce C₃H_6, being similar to reactions of the powdered TiO₂ catalysts. The good parallel relationship between the yield of the photolumunescence and the specific photocatalytic reactivity of the Ti/Si binary oxides as a function of the Ti content clearly indicates that the high phatocatalytic reactivity of the Ti/Si binary oxides having low Ti content is associated with the high reactivity of the charge transfer excited state, of the isolated titanium oxide species in tetrahedral coordination, [Ti^(3+)-O^-]^*.
Multi-Carrier Multi-Rate Modem for Universal FDMA/TDMA system
Yamashita, Fumihiro,Tabata, Masaaki,Kobayashi, Kiyoshi,Kazama, Hiroshi 통신위성우주산업연구회 2006 Joint Conference on Satellite Communications Vol.2006 No.-
We introduce a new multi-carrier multi-rate modem (MCMRM) module designed to support Universal FDMA/TDMA systems. Universal FDMA/TDMA is a new system that flexibly supports MF-TDMA and TDMA as well as multi-rate FDMA. We believe that the Universal FDMA/TDMA system will allow both system operators and customers to utilize frequency and/or time resources more efficiently than is possible with conventional systems. To implement this system, we have developed a new MCMRM module. This module has advanced functions such as a novel frequency multiplexer/demultiplexer, multi-carrier frequency decomposition/regeneration, and multi-carrier burst demodulation. This paper provides a detailed outline of the recently developed functions and an experimental evaluation of their performance. Measured results from the experiments demonstrate the feasibility of developed MCMRM module.
Therapeutic Uses of the Radioactive Isotope
Yamashita, Hisao 대한핵의학회 1971 핵의학 분자영상 Vol.5 No.1
Therapeutic uses of the radioactive isotope can be devided in 3 groups, i.e. 1) Brachytherapy. 2) Multicurie teletherapy and 3) Internal use of naked radioisotope. By utilizing their radioactivity, radioisotopes can be well adapted as effective means to radiaton therapy. From the beginning of the 20th century, natural radioactive substances, like radium, have been widely used for the purpose of the treatment of cancer and other diseases, and have been giving pretty good effects. In the present case of artificial radioisotopes, their applicable fields are not the same with radium, but reach far out to such broader extents, and larger amounts with varieties almost unthinkable with radium. New fields were also cultivated for application of radioisotope directly into human body, and thereby to bring out desirable therapeutic effects. $quot;
Yamashita, Yasuhiko,Kushima, Soichiro,Okuno, Yuuichirou,Morishita, Taisei Council on Tall Building and Urban Habitat Korea 2018 International journal of high-rise buildings Vol.7 No.3
This paper introduces three distinctive means for the use of a 189-meter high damped structure ensuring safety against earthquake: 1. Realization of L-shaped elevational structural planning: The bottom and top of the tower have belt trusses and hat trusses respectively to restrain the bending deformation. Furthermore, large-capacity oil dampers (damping force 6,000 kN) are installed in the middle part of the tower to restrain the higher-mode deformation. 2. Realization of L-shaped planar structural planning: We devised a means of matching the centers of gravity and rigidity by adjusting planar rigidity. Moreover, viscous damping devices are located at the edges of the L-shaped plan, where torsional deformation tends to be amplified. We call this the "Damping Tail" system. 3. Composite foundation to equalize deformations under different loading conditions: We studied the vertical and horizontal deformations using sway-rocking and 3D FEM models including the ground, and applied multi-stage diameter-enlarged piles to the tower and a mat foundation to the podium to keep the foundations from torsional deformations and ensure structural safety.
Fundamental Characteristics of Onboard Bandwidth-Variable FFT Filter Bank
Yamashita, Fumihiro,Kazama, Hiroshi,Nakasuga, Yoshinori,Ueba, Masazumi 통신위성우주산업연구회 2000 Joint Conference on Satellite Communications Vol.2000 No.-
Voice service is currently the main service in mobile satellite communications, but in the future, there will be a demand for high-data rate services offering multimedia contents. Therefore, an onboard processor capable of handling services of various data rates is required. In the present study, it is assumed that a non-regenerative onboard processor will be used. The onboard processor must have functions to filter signals and convert their frequencies in a channel-by-channel manner. An FFT filter bank satisfies these requirements. However, the conventional onboard FFT filter bank is only applicable to signals of constant bit rate. Hence, the onboard bandwidth-variable filter bank that can handle many signals of various bit rates is proposed. The principle of operation of the bandwidth-variable FFT filter bank is described, then the BER performance of an FPGA-implemented design is evaluated.