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기술사마당: 기술자료 -초고층(超高層) 건물(建物) 내(內)에서 누설동축케이블을 이용한 무선통신(無線通信)네트워크 구축(構築) 방안-
이순종,이문호,Lee, Soon-Jong,Lee, Moon-Ho 한국기술사회 2011 技術士 Vol.44 No.5
Currently, wireless communication environment in high-rise buildings are limited in the basement and ground floor facilities are not in common use do not part, in case of disaster is difficult for efficient repression. In this paper, wireless communication facilities on the ground floor of the skyscraper by building infrastructure, wireless communications is proposed to eliminate shadows. That the presence of various wireless communication systems, wireless communication system proposed by this paper, TPS laying coaxial cable seals leak, and the propagation shades in place by installing indoor antenna is the solution to eliminate shadows. The wireless communications solutions reveal the advantages and features, a method of constructing the proposed design.
이순종(Soon-Jong Lee),최수현(Su-Hyun Choi),조영태(Young-Tae Cho),정윤교(Yoon-Gyo Jung),정종윤(Jong-Yun Jung) Korean Society for Precision Engineering 2016 한국정밀공학회지 Vol.33 No.12
In today’s manufacturing industries, the demand for light non-ferrous materials is considerable due to the need to improve productivity and manufacturability. Since the surface roughness of a material is important for improving the functionality of machined parts, various techniques for surface treatments have been developed to obtain non-ferrous materials with low roughness. A superfinishing method utilizing polishing films is generally applied to the anodized surface of Al7075 in order to improve its roughness. The objective of this research is to determine through experiment the parameters that facilitate the shortest processing time, using a superfinishing method, for reaching a roughness of Ra 0.2㎛. This objective is met by applying the Taguchi method in the experiments. Through the experiments of superfinishing, the effectiveness of the parameters adopted for the surface treatment is demonstrated.