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MEA 수용액으로부터 PDMS-PE 복합막 접촉기를 이용한 이산화탄소 감압탈거
김정훈,안효성,김정훈 한국막학회 2012 멤브레인 Vol.22 No.1
본 연구에서는 석탄 화력발전소의 연소 후 CO2 회수 기술인 알칸올 아민 수용액을 이용한 아민흡수법에서 전체 운전비의 80% 가량을 차지하는 탈거에너지의 저감을 위해 새로운 탈거기술인 분리막을 이용한 감압탈거 기술을 제시하고자 한다. 막의 소재로는 소수성막인 PE (polyethylene)를 지지체로 하고 5mum 두께의 PDMS (polydimethylsiloxane)를 코팅한 복합막을 제조하여 적용하였으며, 흡수액으로 MEA (monoethanolamine) 30 wt% 수용액을 사용하였다. 온도의 변화에 따른 영향을 알아보기 위하여 흡수액 온도를 25~80℃로 변화시켜 이산화탄소의 탈거특성을 살펴보았으며, 흡수용액의 CO2 함량(CO2 loading)에 따른 영향을 고찰하기 위하여 CO2 함량을 변화시켰다. 또한 감압탈거 시 탈거측 압력을 60~360 mmHg(abs.)로 변화시켜 진공도에 따른 탈거특성을 연구하였다. 아민수용액의 온도가 증가할수록, 이산화탄소 부하량이 증가할수록 이산화탄소의 탈거량은 증가하는 경향을 보이고 있으며, 감압이 감소함에 따라 이산화탄소의 탈거량 역시 증가하고 있는 것을 확인하였다. 막의 안정성 실험 결과 PTFE 단일막에 비하여 PDMS-PE 복합막의 경우 감압탈거 막공정에 적용하기 안정한 막이라고 판단된다. Low-temperature carbon dioxide stripping by a vacuum membrane stripping technology was studied as a substitute for the stripping process in a conventional aqueous amine process. Composite membranes with 5mum thickness of PDMS (polydimethylsiloxane) dense layer on a PE (polyethylene) support layer were prepared by a casting method and used as a membrane contactor for CO2 stripping. Aqueous amine solutions of 30 wt% MEA (monoethanolamine) were used as absorbents. CO2 flux was examined under various operating conditions by varying the vacuum pressure (60~360 mmHg (abs.)), stripping temperature (25~80℃), CO2 loading (0.5~0.7). CO2 stripping flux increased with increasing temperature and CO2 loading as well as decreasing vacuum pressure. PDMS-PE composite membrane has stability for vacuum stripping process compared with PTFE porous membrane.
드론의 안정적 비행을 위한 핵심요소와 도시 수평 공간구획
김정훈,김홍배 대한국토·도시계획학회 2018 國土計劃 Vol.53 No.7
The purpose of this study is to verify the stable flight conditions of drones within a limited urban area by using the ICAO(International Civil Aviation Organization) reich model which is using to evaluate civil aircraft stability. The results of the study are summarized as follows. First, in order for the drones flying stably, the horizontal safety separation distance between a drone and another should be at least 1,852M. Second, assuming that no obstacles within 1,852M of horizontal space, two drones can be fly into upper and lower spaces. However there are obstacles such as buildings, it is impossible to secure a 1,852M distance between drones. Third, sensitivity analysis point out that the separation interval() of drone aviation has the greatest influence on the TLS(Target Level of Safety). If future research is conducted to lower the numerical values, the safety distance between a drone and another drone will be drastically reduced, allowing more detailed urban space division, and will be presented as a scientific numerical value for establishing a dedicated path for the drones. 드론 도입을 위한 도시 입체계획의 이슈와 과제에서는 항공법에 의한 드론 운항 가능 고도인150M 이내에서 국제민간항공기구(이하 ICAO)의 안전 목표(이하 TLS, Target Level of Safety)를 만족하며 비행 가능한 드론 수량은 2대로서, 도시 공간을 2개의 수직 공역으로 분리하여 운영되어야 함을 제시하였다(김정훈·김홍배, 2018). 그러나 도시는 3차원 공간으로서 수직 공간 외에 수평 공간에서의 드론의 비행에 대해서도 논하여야 한다(유상형·전종우·조광수, 2018). 이는 차량이 이동하기 위하여 도로망을 설계하고 건설하듯이 향후 드론의이동을 위한 비행로를 구획하고 지정하기 위한 중요하고 필수적인 단계이다(이수미·김용진, 2017). 따라서 본 논문에서는 도시 공간에서 드론의 안전한 비행을 위한 드론 간 최소 수평 분리 간격을검증하고, 검증된 수치를 기준으로 도시 공간을 수평적으로 분리하고자 한다.
Down's Syndrome(몽고증)의 세포유전학적 연구
김정훈,오선경,김정구,문신용,이진용,장윤석,Kim, Chung-Hoon,Oh, Sun-Kyung,Kim, Jung-Koo,Moon, Shin-Yong,Lee, Jin-Yong,Chang, Yoon-Seok 대한생식의학회 1986 Clinical and Experimental Reproductive Medicine Vol.13 No.2
The purpose of this study is to investigate the cytogenetic characteristics of Down's syndrome in Korea. For this study, selected were 92 patients who were diagnosed as Down's syndrome by the chromosomal analyses, among 115 patients who were supected of Down's syndrome and referred to the Cytogenetic Laboratory, Institute of Reproductive Medicine and Population, Seoul National University, for 2 years from January 1984 to December 1985. Among 92 patients with Down's syndrome 83 (90.2%) had G-trisomy, 4 (4.3%) had translocation, and 2 (2.2%) had mosaicism of normal and G-trisomic cell lines. Two patients of the remaining 3 had both G-trisomic and translocation, 47, XX, t (1:21) (p32:q22), +21, 47, XX, t (9:11) (q34:q14), +21. The remaining 1 patient had 47, XY, +mar.
김정훈,이준경,신현규,Kim, Jung-Hoon,Lee, Jun-Kyoung,Shin, Hyeun-Kyoo 대한한방안이비인후피부과학회 2011 한방안이비인후피부과학회지 Vol.24 No.1
Objective : To establish the fundament for EBM of Traditional Korean Medicine, the papers on Bangpungtongseong-san (Fangfengtongsheng-san) frequently used in medical institutions of Traditional Korean Medicine were analyzed through researching domestic and international papers. Methods : The papers were classified by the registration of domestic or international journals, the year of publishment, experimental fields and the kinds of studies on biological activities. Results : Among 324 volumes of papers on Bangpungtongseong-san (Fangfengtongsheng-san), 38 volumes were selected according to selective criteria. 18 volumes were published in domestic journals, 20 volumes were in Japanese journal. The papers on instrumental analyses reported the quantification of standard compounds of herbal medicines in Bangpungtongseong-san (Fangfengtongsheng-san) using HPLC method. The papers on biological activities of Bangpungtongseong-san (Fangfengtongsheng-san) showed inhibitory effect to obesity, arteriosclerosis, allergic response, inflammation, pain, hyperlipidemia, hypertension, atopy, diabete mallatus and improvement of gastrointestinal activity and cerebral blood circulation. Among biological activities, papers on anti-obesity effect were reported mostly. Conclusions : Further studies including anti-obesity activity need to be preceeded to establish the fundament for EBM of Bangpungtongseong-san (Fangfengtongsheng-san).