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도시계획이 토지가격에 미치는 영향에 관한 연구 - 상봉 재정비촉진지구를 중심으로
전석기,김형주 한국도시부동산학회(구 도시정책학회) 2014 도시정책연구 Vol.5 No.2
The purpose of this study is to analyze the influence of urban planning on the land prices focused on Sangbong redevelopment promotion area and to find out a major determinant in pricing the land. According to the analysis, land prices are rising sharply by the development plan such as redevelopment promotion plan rather than by management plan. Also the increase in land prices is becoming larger by the following conditions of land : a long distance to subway station, a narrow width of frontal road, a small number of attached road. It’s contrast to general change of land prices, and it means the plan of the district-unit can leads to a accidental profit. Therefore, when establishing the development plan or district unit plan, it‘s necessary to tread very carefully in handling land prices issue. In addition, reasonable management approaches to a accidental profit are needed for land prices stabilization.
전석기,김정일,김근주 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.3
We report a reflex klystron in which an embedded planar cold cathode is used to generate a secondary electron beam. By using secondary electron cathode with a high secondary electron yield, the number of secondary electrons can be sufficiently increased and adjusted to activate the reflex klystron. In our three-dimensional particle-in-cell simulations, oscillation of the device was demonstrated at 100 GHz when using a secondary electron cathode with a maximum yield of 20 while a primary electron beam with a current density less than 5 A/cm2 was irradiated to create secondary electrons. The current density of the primary electron beam is achievable with typical field emission cathodes if they are equipped with an electron beam focusing lens, and a maximum yield of 20 can be obtained if magnesium oxide is used for the secondary electron emission.
전석기(Sukky Jun),조영삼(Young-Sam Cho),임세영(Seyoung Im) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The moving least square (MLS) basis is implemented for the real-space band-structure calculation of 2D<br/> photonic crystals. The value-periodic MLS shape function is thus used in order to represent the periodicity of<br/> crystal lattice. Any periodic function can properly be reproduced using this shape function. Matrix eigenequations,<br/> derived from the macroscopic Maxwell equations, are then solved to obtain photonic band<br/> structures. Through numerical examples of several lattice structures, the MLS-based method is proved to be a<br/> promising scheme for predicting band gaps of photonic crystals.