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연성 개폐식 구조물 케이블 설치 위치 검증을 위한 드론 활용방안
조한광(Cho, Hankwang),권나현(Nahyun Kwon),김상환(Kim, Sangwan),조재윤(Cho, Jaeyoun),안용한(Yonghan Ahn) 한국퍼실리티매니지먼트학회 2020 한국퍼실리티매니지먼트학회지 Vol.15 No.2
Indoor gymnasiums and dome stadiums are mostly made of fixed hard structures, which leads to economic loss due to the continuous operation of ventilation and lighting equipment. When the roof of a large space is installed by retractable method, it secures comfortable environment by natural light during the daytime and reduces ventilation costs. The retractable spaces can be constructed in hard and soft structures. In the case of soft structures, cables and membrane are the primary components. In order to install the cables, it is necessary to determine the location of the central part where each cable meets. However, the existing approach depending on only some workers shows a limited ability in investigating the appropriateness of the installed cables. Therefore, this study aims to propose a method to determine the installation location of the soft retractable structure cables based on the numerical data derived from drones. Factors that can inspect the construction quality of cables and membrane materials in the construction stage and construction completion stage were identified. Based on the construction guidelines of the Ministry of Land, Infrastructure and Transport of Korea (MOLIT), standard specifications, and relevant similar cases, the applicability of the method using the numerical data of the drone was investigated.
조상환 ( Sang Hwan Jo ),김건형 ( Gun Hyung Kim ),조민정 ( Min Jeong Cho ),한명완 ( Myung Wan Han ),강경석 ( Kyung Suk Kang ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.1
PET는 자연 미생물에 의해서는 완전히 분해되지 않고, 산업의 발달과 소비 증가에 따른 PET의 광범위한 사용과 보급에 의한 많은 PET 폐기물의 발생은 심각한 환경문제를 야기한다. 이를 처리하기 위한 매립 및 소각은 소중한 화학자원의 경제적 손실이기도 하다. 이러한 환경 및 경제적 문제들을 다룰 수 있는 PET의 재활용 및 재처리에 관한 다양한 방법들을 제시하였다. 그 중 폴리에스터 폐자원의 화학원료화가 매력적인 방법으로 각광받고 있다. 화학 원료화는 화학반응을 통해 고분자 PET 사슬을 분해시키고, 그 후 분리 정제과정을 통해 단량체와 같은 원료 화합물을 만드는 것이다. 이 원료 화합물로부터 새로운 폴리에스터를 재합성할 수 있기 때문에 폐 PET의 처리에 좋은 대안이라 할 수 있다. Wide spread application and non-biodegradability of the poly(ethylene terephthalate) generate a huge amount of waste and disposal, posing serious environmental problems. Disposal of the PET wastes also can be thought as an economic loss of valuable chemical resources. We present various ways of feedstock recycling of PET waste to deal with environmental and economic problems. Feedstock recycling is one of promising technologies. It is based on the concept of depolymerizing the condensation polymer such as PET through solvolytic chain cleavage into low molecular products which can be purified and reused as raw materials for the production of high quality chemical products.
조상환(Sanghwan Cho),남연우(Younwoo Nam),최유열(Yoo youl Choi),이원남(Wonnam Lee) 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.2013 No.12
The characteristic of soot formation from the newly developed high-temperature flow reactor type soot generator furnace has been experimentally investigated. The possibility of control of primary particle size and soot concentration was confirmed by experiments using propylene and n-hexane, which are gaseous and liquid fuels. The competition between reaction (soot formation) time scale and flow (residence) time scale seem to be the most important factor for the soot primary particle size and concentration. The desired primary particle size and soot concentration could be obtained by controlling the fuel concentration and residence time at the nominal operating temperature of 1300˚C.