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하지운 大韓成形外科學會 1986 Archives of Plastic Surgery Vol.13 No.3
Tissue expansion is an alternative in reconstruction by providing donor tissue of the same color, texture, similar thickness, sensation with minimal scar formation and minor donor site morbidity. Adjacent flap development by tissue expansion is the mechanical enlargement of the donor tissue by internal pressure induced through the expander, which is intermittenly and forcefully injected with normal saline. The modern ear of soft tissue expansion began following the pioneering efforts of Dr. Chedomir Radovan. His work was first present in 1976. Recently. It is widely and successfully used in various soft tissue defect or deformities. I successfully applied the tissue expander in 6 patients. The first case was a 25 year old woman, who had multiple depressed scars in left lower extremity. The second case was a 30 year old man who had suffered from neck scar contracture following flame burn. The third case was a 13 year old boy with extensive depressive scars on both thing following degloving injury. The fouth case was a 25 year old womal, who had a burn scar on chin and neck. In the fifth case, 20 year old woman with Pland's syndrom, who had unilateral breast agenesis with absence of pectoralis muscle, was reconstructed with transfer of latissums dorsi muscle flap and permannent breast implant insertion after temporary chest skin expansion. The sixth case was a 14 year old girl, who had a wide anterior tibial scar contracture. All cases were successfully reconstructed without complications.
하지운,김상욱,권순형,박선주 한국정보과학회 2013 데이타베이스 연구 Vol.29 No.1
인터넷 상거래가 활성화됨에 따라 추천 시스템의 연구 분야로서의 중요도 및 실용적 비즈니스 도구로써의중요도가 증가하고 있다. 사용자에게 실제로 아이템을 추천하기 위해서는 사용자가 선호하는 순으로 아이템에순위를 정하고, 그로부터 일정 개수의 아이템을 선정하는 것이 중요하다. 본 논문에서는 타겟 사용자가 각아이템들을 얼마나 선호하는지를 확률적으로 예측하는 새로운 top-n 추천 방안을 제안한다. 타겟 사용자가각 아이템을 선호할 확률을 예측하기 위해 신뢰 파급 (belief propagation) 을 사용한다. 본 논문에서는 신뢰파급을 위한 그래프를 생성하는 과정에서 에지 인정 기준과 노드 초기값에 따른 추천의 정확도의 변화를 분석하고, 기존 방안들과의 비교를 통해 제안하는 방안의 성능을 평가하여 추천 정확도가 기존 random walk with restart 기반 방안 대비 최고 약 40% 증가하였음을 보인다. As the vitalization of e-commerce, the importance of recommender systems as a research area and a practical business tool has grown. In order to recommend items to a target user, it is important to rank the items in order of the preference of the target user and pick a specific number of items from them. In this paper, we propose a novel top-n recommendation method probabilistically determines the preference of the target user on each item. We employ Belief Propagation to infer the preference of the target user's preference on each item. We analyze changes of the accuracy of the proposed method according to edge threshold settings and node priors settings while graph construction. Also, by experiments, we show that the proposed method is about maximum 40% more accurate than a existing method based on Random Walk with Restart.
Depressor Septi Nasi Muscle의 비후에 의한 비축주 변형의 치험례
하지운 大韓成形外科學會 1993 Archives of Plastic Surgery Vol.20 No.1
The columella is penetrated by the paired depressor septi nasi muscles which arise from the incisive fossa of the maxilla and insert into the caudal portion of the septum and have a few fibers into the cephalic portion of the ala of nose. Its principal function is to tense the membranous septum. The author present a case of congenital columella deformity due to hypertrophy of depressor septi nasi muscle, which is initially misdiagnosed as a soft tissue tumor such as lymphangioma. Exploration though a columella base incision revealed a distinct columella muscle(5㎜ wide by 5㎜ thick)with is origin at the nasal spine and insertion on the upper septum. The hypertrophic muscle and the excess columella tissue were excised. A pathologic examination demonstrated a normal skeletal muscle. There was noticeable improvement in the columella contour after the operation.