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남광현,오위영,Nam, Kwang-Hyun,Oh, Wee-Yeong 한국해양과학기술원 2003 Ocean and Polar Research Vol.25 No.4
The purpose of this paper is to investigate economic feasibility of creating artificial tidal flats using cost-benefit analyses. We assumed that the cost factors are associated with designing, construction and monitoring, and the benefit factors are associated with fisheries production, habitation, prevention of disasters, water purification, aesthetic value and existence value. First, for analyzing economic feasibility, the scenario suggests that a design can be made in a year, construction can be completed in three years and monitoring must be made for 20 years. Assuming the discount rate of 7.5%, economic feasibility analyses showed that B/C was 2.26 and IRR was 14.50. This study indicated there is economic validity of implementing creation of artificial tidal flat. In addition, we carried out a sensitivity analysis at the change of discount rate and restoration rate. The result of sensitivity analysis clearly showed that economic validity is low when discount rate is over 15%, and changes in restoration rate did not significantly effect on the economic validity.
밀도법 및 피부두겹법에 의한 중년 남자의 총지방량 측정
남광현(Nam, Kwang-Hyun),신동훈(Shin, Dong-Hoon) 대한생리학회 1974 대한생리학회지 Vol.8 No.1
Formulas for the prediction of total body fat from skinfold thickness in middle aged men were presented. Hydrostatic weighing was made on 35 middle-aged men (age: 40 ~ 50 years) sad corrected for residual volume in lung. Skinfold thickness at four sites, namely, arm, back, waist and abdomen were compared with total fat calculated from the formula given by Keys and Brozek and regression equations were derived. In middle-aged men the observed values were: Body density, 1.07478 ; total body fat, 10.51% body weight; lean body mass, 89.49% body weight; arm skinfold thickness, 4.85mm; back, 10.4 ; waist, 7.72; abdomen, 7.62 and mean skinfold thickness of the four sites, 7.59 mm. The correlations between skinfold thickness and body density were high. The correlations between skinfold thickness and total body fat were also high. The coefficient of correlation between total body fat and arm skinfold, mean skinfold thickness were r=0.839 and r=0.862, respectively. Arm and mean skinfold thicknesses (x, mm) could be used as the representative value for the prediction of total body fat (y, % body weight). The regression equations were: On arm y=2.00x+0.99, With mean skinfold y=1.20x+1.41 The coefficient of correlation between body weight (kg) and mean skinfold thickness was r=0.733. The ratio of mean skinfold thickness (mm) to body weight (kg) in middle-aged men was 0.132.
남광현(Kwang-Hyun Nam),홍영식(Young-Sik Hong) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.2Ⅲ
인터넷의 대중화로 컴퓨터 네트워크의 사용자 보편화 되었고, 그룹통신 기법이 화상회의등 많은 응용분야에서 활용되고 있다. 분산 실시간 시스템에서 그룹 통신의 신뢰성을 보장하는 일은 매우 중요하다. 또, 그룹 통신에서 효과적으로 그룹을 관리할 필요가 있고, 현재 실시간 환경에서의 그룹통신은 네트워크의 부하 때문에 생기는 패킷의 손실과 노드의 고장 같은 여러 가지 문제점들을 가지고 있다. 본 논문에서는 이러한 문제점들을 개선시켜 보고자 고장이 발생했을 때에도 그룹 변경을 가능하게 하는 분산 실시간 환경을 위한 신뢰성 있는 그룹관리기법을 제안하고, 실시간 시뮬레이션을 통해 제안된 기법을 평가한다.
임상원저 : 관절원판 유착을 동반한 악관절 내장증 환자의 수술후 증상의 변화
박광호(Kwang Ho Park),김형곤(Hyung Gon Kim),남광현(Kwang Hyun Nam),허종기(Jong Ki Huh),김일수(Il Soo Kim),최희수(Hee Soo Choi) 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.3
Purpose: The aim of this study was to find the clinical characteristics of the patients who had temporomandibular joint internal derangement (ID) with disc adhesion (adhesion group) compared to only disc displacement without discadhesion, perforation, hyperemia, and so on (ID group). Materials and methods: Thirty seven joints were included in adhesion group and 54 joints in ID group of all 174 patients (174 joints) treated surgically and had been checked periodically over 12 months at TMJ clinic of Yongdong Severance Hospital, Yonsei University, between 1992 and 1997. Mouth opening range, pain during mouth opening and biting, headache, neck/shoulder pain and TMJ sound were checked his/her every visit before and after surgery. Results: The maximum mouth opening was improved significantly after postoperative 3 months in two groups (p<0.01), but adhesion group was less improved. Pain during mouth opening was improved significantly over 3 months after surgery in adhesion group (p<0.01), but in ID group 1 month after surgery. Biting pain was improved and maintained it after surgery and not significant difference between two groups. Headache and neck/shoulder pain were much improved after surgery (p<0.01), but slight relapse was found in adhesion group after 12 months. TMJ sound was more found in adhesion group after 1 month (p<0.05), but after 3 months, no significant difference was found between two groups. Conclusions: The postoperative results of adhesion group were worse than ID group. Therefore, it is considered more carefully to diagnose and treat in cases of internal derangement with adhesion.
김학선,이승수,남광현,김용달,홍창문,심규철,김응철,Kim. Hak-Sun,Lee. Sung-Su,Nam. Kwang-Hyun,Kim. Yong-Dal,Hong. Chang-Moon,Shim. Kyu-Cheoul,Kim. Eung-Chul 한국방재학회 2007 한국방재학회 학술발표대회논문집 Vol.2007 No.1
Damages induced typhoons have been increased and super-typhoons have occurred frequently. In our study, we propose a storm risk assessment technique based on CFD for the industrial structures and equipment located in the coastal regions. Inflow wind speeds are obtained through the information of geography and meteorology in considering regions before pressures of wind-environment and structures corresponding to different winds are calculated with wind speed multiplier and pressure coefficient. The results are applicable to evaluate a warning wind speed or regions vulnerable to debris in a considering region and to examine the safety of structures and their exteriors.