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CRST 증후군에 대한 Reserpine 의 동맥내 주사효과
박재우,신실,손숙자 대한피부과학회 1981 大韓皮膚科學會誌 Vol.19 No.6
The CRST syndrome, first reported by Winterbauer, represents a benign variant of scleroderma and consists of calcinosis(C), Raynauds phenomenon(R), sclerodactyly(S) and telangiectasia(T). The authors report a case of CRST syndrome confirmed by both clinical and histopathological findings. A 62-year-old female developed subcutaneous nodules on both elbow and knee joints, Raynauds phenomenon, sclerodactyly with acrosclerosis and scleroderrnatous changes on both hands and forearms and telangiectasia on the face, neck, and hands of 15 years duration, but she had no difficulty in swallowing. The authors treated a case of CRST syndrome with weekly intra-arterial administration of reserpine and were impressed not only by the marked loosening of the skin but also by the striking effect on the Raynauds phenornena; the latter disappeared within a few weeks of treatment.
사회연결망 분석을 이용한 국방 강소벤처 Tech-Fi Net 기술동향 분석
박재우,이일로,권재욱,변기식,조성용 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.12
The purpose of this research was to analyze technological trends of 「Military Small Giant Venture Tech-Fi Net」 from Defense Technology Information Service via social network analysis. 「Military Small Giant Venture Tech-Fi Net」, which was constituted for their fine technology for application to the military field, registered 847 technologies of 388 companies. In this research, we analyzed 847 technologies for the relations between "Military System" and "Military Technology Category" via centrality measurement, one of the social network analysis methods. The results indicate that the major technologies of domestic military small giant venture companies were "Sensor" and "ICT" for "C4I System" and "Surveillance and Reconnaissance System" and "Platform/Structure" for "Land System", "Aeronautical System" and "Naval Sea System". In contrast, we recognized inadequate technologies, such as "Propellant" and "Material" for "Missile and Ammunition system" and "Sensor" and "ICT" for "Defense System", We hope that our results and method will be conducive to the technological development of Small Giant Venture companies. 본 연구에서는 국방기술정보통합서비스(Defense Technology information Service)에서 제공하는 「국방 강소벤처 Tech-Fi Net」에 등록된 데이터를 대상으로 사회연결망 분석을 통해 국방 강소벤처 기업에 대한 기술동향을 분석하고자 하였다. 「국방 강소벤처 Tech-Fi Net」은 국내 중소·벤처 기업의 우수한 기술을 국방분야에 적극적으로 활용하기 위하여 구축된 데이터베이스로서, 2019년 전반기까지 총 388개 업체에서 보유하고 있는 847개의 기술에 대한 정보가 수록되어 있다. 본 연구에서는, 847개의 기술을 대상으로 사회연결망 분석 방법론 중에서도 중심성 분석기법을 적용하여 기업 보유 기술을 기반으로 한 무기체계 및 국방기술분류 간 관계도를 분석하였다. 분석결과, 국내 중소·벤처 기업이 보유하고 있는 기술은 크게 ”감시/정찰체계“ 및 ”지휘통제·통신체계“에 적용되는 ”센서“ 및 ”정보통신“ 기술과 ”기동체계“, ”함정체계“, ”항공체계“에 적용되는 ”구조/플랫폼“ 기술인 것으로 파악되었다. 반면에 ”화력체계“에 적용되는 ”추진“과 ”소재“ 기술은 발전이 요구되며, ”방호체계“에 있어서도 ”센서“ 및 ”정보통신“ 기술의 적용이 미흡한 것으로 식별되었다. 우리는 본 연구의 결과 및 방법론이 향후 중소·벤처 기업 기술 개발 시 방향성 제시를 위한 참고자료로서 활용되기를 기대한다.
나노다공체 물성 측정을 위한 극저온(20K) 수소 BET 개발 및 응용
박재우,오현철,Park, Jaewoo,Oh, Hyunchul 한국재료학회 2017 한국재료학회지 Vol.27 No.9
With the matters of climate change, energy security and resource depletion, a growing pressure exists to search for replacements for fossil fuels. Among various sustainable energy sources, hydrogen is thought of as a clean energy, and thus efficient hydrogen storage is a major issue. In order to realize efficient and safe hydrogen storage, various porous materials are being explored as solid-states materials for hydrogen storage. For those purposes, it is a prerequisite to characterize a material's textural properties to evaluate its hydrogen storage performance. In general, the textural properties of porous materials are analyzed by the Brunauer-Emmett-Teller (BET) measurement using nitrogen gas as a probe molecule. However, nitrogen BET analysis is sometimes not suitable for materials possessing small pores and surfaces with high curvatures like MOFs because the nitrogen molecule may sometimes be too large to reach the entire porous framework, resulting in an erroneous value. Hence, a smaller probe molecule for BET measurements (such as hydrogen) may be required. In this study, we describe a cost-effective novel cryostat for BET measurement that can reach temperatures below the liquefaction of hydrogen gas. Temperature and cold volume of the cryostat are corrected, and all measurements are validated using a commercial device. In this way, direct observation of the hydrogen adsorption properties is possible, which can translate directly into the determination of textural properties.