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김정훈,이준규,안영수,여정구,이진석,강기환,조철희,Kim, Jeong-Hun,Lee, Jun-Kyu,Ahn, Young-Soo,Yeo, Jeong-Gu,Lee, Jin-Seok,Kang, Gi-Hwan,Cho, Churl-Hee 한국재료학회 2019 한국재료학회지 Vol.29 No.11
In this study, we investigate the relationship between the peeling behavior of the backsheet of a photovoltaic(PV) module and its surface temperature in order facilitate removal of the backsheet from the PV module. At low temperatures, the backsheet does not peel off whereas, at high temperatures, part of the backsheet remains on the surface of the PV module after the peeling process. The backsheet material remaining on the surface of the PV module is confirmed by X-ray diffraction(XRD) analysis to be poly-ethylene(PE). Differential scanning calorimetry(DSC) is also performed to investigate the interfacial characteristics of the layers of the PV module. In particular, DSC provides the melting temperature($T_m$) of laminated ethylene vinyl acetate(EVA) and of the backsheet on the PV module. It is found that the backsheet does not peel off below the $T_m$ of ethylene of EVA, while the PE layer of the backsheet remains on the surface of the PV module above the $T_m$ of the PE. Thus, the backsheet is best removed at a temperature between the $T_m$ of ethylene and that of PE layer.
김정훈(Joung-Hun Kim),김창영(Chang-Young Kim),장중진(Joong-Jin Chang),장인기(In-Ki Chang),전병규(Byung-Kyu Jun) 한국항공우주학회 2014 韓國航空宇宙學會誌 Vol.42 No.8
항공기의 연료량 지시계는 비행동안 잔여 연료량을 시현해주는 장치로 비행 중에는 정상적으로 성능을 발휘해야 한다. 한국형 기동헬기 연료량 지시계는 비행 중에 결함코드 “8888”을 시현하여 잔여 연료량을 확인하지 못해 비행안전에 영향을 끼쳤으며 고장탐구 과정에서 개발과정 시 미흡하게 설계된 EMI/EMC 성능을 확인하였다. 본 논문에서는 비행 중 결함코드를 시현하는 원인인 전자기 외란에 의한 전원 불안정 및 CAN 통신 오류를 확인하고 이와 연관된 연료시스템의 개선 및 설계 적합성을 입증하였다. Aircraft fuel indicator is a device to indicate the amount of fuel remained during flight, where accurate and consistent operation of the indicator should be maintained. Previously the Korean Utility Helicopter fuel indicator sporadically displayed abnormal sign by 8888 during flight, jeopardizing flight safety. Inappropriate EMI/EMC performance was detected during trouble shooting process. The cause of the abnormal display was found to be resulted from unstable power induced by electro-magnetic disturbance and CAN communication error. The aircraft fuel indicator design was improved and the design compatibility was verified to avoid abnormal display.
EBM 기반구축을 위한 귀비탕(歸脾湯) 연구 문헌 분석
김정훈 ( Jung Hoon Kim ),이준경 ( Jun Kyoung Lee ),하혜경 ( Hye Kyoung Ha ),서창섭 ( Chang Seob Seo ),이미영 ( Mi Young Lee ),이호영 ( Ho Young Lee ),정다영 ( Da Young Jung ),이남헌 ( Nam Hun Lee ),이진아 ( Jin Ah Lee ),황대선 ( D 대한한방신경정신과학회 2009 동의신경정신과학회지 Vol.20 No.3
Objectives: To establish the fundaments for EBM of Traditional Korean Medicine, the papers on Guibi-tang(Guipitang) which were frequently used in medical institutions of Traditional Korean Medicine were analyzed through researching domestic and international literatures. Methods: The papers were classified by the year of publishment, by experimental methods, by laboratory animals used in biological experiment and by the kinds of studies on biological efficacy. Results: Of total 39 papers were registered in domestic journals. Since 1980, publishments of papers have continuously increased. The papers on biological studies were 34 volumes, clinical studies were 5 volumes. Biological studies mainly showed the effects of anti-stress, anti-oxidant, hemostasis, anti-osteoporosis, gastroprotection, reproductive ability, brain cell activity, radioprotection. And clinical studies showed improvements of fearful throbbing, memory and orientation, insomnia, vericose vein, schizophrenia. Conclusions: Guibi-tang(Guipitang) could be used to fortify the spleen, nourish the heart and then control the blood. However biological studies need to be conducted in accordance with clinical study and further clinical studies on randomized controlled trials should be proceeded.