• Title/Summary/Keyword: 한국대지

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Improving on Planting in Small Scale Development - The Case of Seoul - (소규모 대지의 조경 개선방안에 관한 연구 - 서울시를 사례로 -)

  • Cho, Yong-Hyeon
    • Journal of the Korean Institute of Landscape Architecture
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    • v.37 no.5
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    • pp.31-41
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    • 2009
  • Under the Korea Building Act, anyone planning to build a building or buildings on a site over $200m^2$ must plant plants over a specific area. In large scale development this rule is adhered to well, but such is not the case in small scale development. Therefore, special attention must be given to small scale development. Thus, the purpose of this research is to analyze the current situation and practice of planting at small scale development sites in Seoul, and then suggest policies for improving them. In this study using the data covering Seongbuk-Gu and Gangnam-Gu, which was surveyed in 2002, the current situation and practice of planting at small scale development sites was analyzed. After a questionnaire survey was conducted with government officers and building owners, the same analysis was made. Then the policies for improvement were extracted. The results are as follows: 1. In superordinate planning stage, because the minimum standards are too low, those must be strengthened. Any district plan does not control planting in private building lots. This requests active application of planting in private building lots as a design control measure in district planning. 2. In the building design stage, there are no guidelines. The obligation of building set-back between adjacent buildings by the Korean Building Act produces mass shaded and inferior planting beds. The act also is blocking landscape architects' participation in small scale development. And wall installations deteriorate the streetscape and growth of plants with shading. Therefore guidelines must be made. 3. In each stage of the building permit, the permit for building completion, and maintenance the Korean Building Act is blocking landscape architects' participation in small scale development, so the planting plan is completely handled by nonprofessional persons. Therefore, the act should be amended in order to make way for landscape architects' participation in each stage of the small scale development process.

Characteristics on the Neutral Point Potential of Line-to-Ground Voltage according to Line-to-Ground Fault in Resistance Ground System for Ships (선박의 저항접지 시스템에서 지락 고장에 따른 대지전압 중성점 전위 특성)

  • Lee, Yun-Hyung;Ryu, Ki-Tak
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.5
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    • pp.689-696
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    • 2018
  • System grounding is applied to the neutral point of a power source to secure the from any abnormal voltage and/or grounding fault. System grounding, which is applied mainly in ships is an ungrounded and resistance grounded system. Vessels using the MV power system with 3.3kV, 6.6kV, and 11kV mainly adopt a high resistance grounding system among the resistance grounding systems. The ground fault accounts for 95% of all faults occurring in the electrical system and when a fault occurs, the line-to-ground voltage of the power system is increased excessively, which adversely affects the onboard insulation system. This study analyzed the variation characteristics of the line-to-ground voltage neutral point according to the degree of ground fault in a resistance ground system applied in vessels. For this purpose, the characteristics of the grounding system were first explained, and the modeling of the neutral point potential of the line-to-ground voltage of the resistance grounding system in the vessels was derived. Finally, this study examined how the line-to-ground voltage, line voltage, and neutral point change according to various variable environments through MATLAB simulations.

접지설계 기술 기준 및 시공기술

  • 이규복
    • Electric Engineers Magazine
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    • v.222 no.2
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    • pp.37-44
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    • 2001
  • 접지는 전기설비와 대지의 사이에 확실한 전기적 접지를 실현하려는 기술이다. 언뜻 보기에는 간단한 기술인 것처럼 보이지만 실은 쉽지 않다. 접지는 탐구하면 할수록 깊어지는 기술이다.

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