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조광현(Kwang Hyun Cho),조미경(Mi Kyung Cho),이유신(Yoo Shin Lee),함의근(Eu Keun Ham) 대한피부과학회 1989 대한피부과학회지 Vol.27 No.4
A total of 68 primary melanorna cases diagnosed at Seoul National University Hospital for the past 10 years from 1978 to 1987 were included for this clinico pathological study. Among the 31 primary cutaneous melanomss, 19 cases (61.3%) occurred on hands or feet, especially on the plantar surfaces. The average age of patients with acral melanomas was 49.3 years at the tirne of diagnosis and the male to female ratio of 19 cases was 3.8 to 1. The clinical and histopathologic findings showed that most ecral melanomas, if not all, were the acral lentiginous type. A high incidence of metastasis (73.7%) was recognized in acral melanomas.
조광현 ( Kwang Hyun Cho ),박현선 ( Hyun Sun Park ) 대한피부과학회 2010 대한피부과학회지 Vol.48 No.7
Acral lentiginous melanoma (ALM) is the most common subtype of melanoma in Asian countries including Korea. ALM was considered more aggressive than other subtypes, but recent reports suggest that it was because of late detection or delayed diagnosis, rather than a true biological difference. Therefore, early diagnosis of ALM is important for a better prognosis but its diagnosis is not always easy. There are scarce reports upon ALM in situ, probably due to its rarity and diagnostic difficulty, which makes in depth understanding and proper management of ALM in situ complicated. Therefore, we have reviewed our experience for twenty years with acral pigmented lesions showing intraepidermal proliferation of melanocytes which was diagnosed or suspected as ALM in situ. (Korean J Dermatol 2010;48(7):551∼557)
조광현(Kwanghyeon Cho),김재관(Jae kwan Kim),최성훈(Sunghoon Choi),이상훈(Sang hoon Lee),박일우(Ill-woo Park) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.11
본 연구는 자전거의 속도를 이용하여 자동으로 기어변속을 하는 시스템 개발에 관한 연구이다. 본 논문은 자전거의 기어변속 메커니즘을 활용하여 기어 변속기를 개선함으로써 진행속도에 맞추어 자동으로 기어 변속을 수행하는 시스템의 설계 및 개발에 관하여 서술하였다. 상세하게는 뒷바퀴에 속도 측정장치를 설치하여 회전수에 따라 자전거의 진행하는 속도를 감지하며, 기존 자전거의 변속기에 개발된 전자제어장치를 탑재하여 운행자의 진행속도에 맞추어 자동변속을 구현한다.
조광연(Kwang Yun Cho) 한국식품영양과학회 1989 한국식품영양과학회지 Vol.18 No.1
쌍화차의 제조공정중 추출은 용매를 50% etanol로 하고 그 첨가량은 원료량의 10배로 하였을 때 가장 수율이 높았고, 추출온도 및 시간은 90℃ water bath에서 8시간 추출하는 방법이 가장 효과적으로 생산비를 절감할 수 있었다. 또한 특수성분의 HPLC분석 결과는 50% etanol로 추출한 제품이 물로 추출한 것보다 높은 양을 나타내었고 특히 Decursinol성분의 경우에 물추출로는 38.59 PPM, 50% etanol추출로는 298.02PPM으로 가장 현저한 차이를 나타내었다. During the preparation of Ssang Wha tea it was observed that the highest yield was obtained when it was extracted with 50% ethanol, of which guantity was added 10 times more then that of Sample. The most effective extraction temperature and time was 90℃ and 8hours on the water bath, which was resulted in saving of production cost. From the HPLC Analysis, it was also observed that product extracted with 50%ethanol give higher yield than that of exfrac ted with water.