입력전류 파형 개선형 단상 정류기의 토폴로지

이상현(Sang-Hyun Lee),박진민(Jin-Min Park),문상필(Sang-Pil Mun),서기영(Ki-Young Suh) 한국조명·전기설비학회 2003 한국조명·전기설비학회 학술대회논문집 Vol.2003 No.-

For small capacity rectifier circuits such as these for consumer electronics and appliances, capacitor input type rectifier circuits are generally used. Consequently, various harmonics generated within the power system become a serious problem. Various studies of this effect have been presented previously. However, most of these employ switching devices, such as FETs and the like. The absence of switching devices makes systems more tolerant to over-load, and brings low radio noise benefits. We propose a power factor correction scheme using a LC resonant in commercial frequency without switching devices. In this method, it makes a sinusoidal wave by widening conduction period using the current resonance in commercial frequency, Hence the harmonic characteristics can be significantly improved, where the lower order harmonics, such as the fifth and seventh order are much reduced. The result are confirmed by the theoretical and experiment implementations.

비만 여성을 대상으로 한 해조류 추출물의 국부처치와 운동 병행을 통한 지방분해 효과의 임상적 검정

서태수,이인숙,변재철,김규호,박승한,김유영,김상국,김현정,김상기,신동철,성미영,박종석,김종기,박언휘 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.3

This study was carried out to test the body fat breakdown during topical seaweed extract treatment and in combination with the aerobic exercise. Of 20 female obesity subjects, ten treated a cream types of seaweed extract(control group) and ten treated a placebo cream(placebo group). Topical treatment of each sample was designed for 4 weeks, and treated with 2 times a day about 10ml on the abdomen and the thigh, respectively. All subjects were participated aerobic dance half hour a day and four times a week. After 4 weeks of topical treatment and exercise, they were measured body fat, skinfold thickness, body circumference. Then venous blood samples were taken and analyzed blood cells, serum enzymes, and serum lipids. There were reduction of body weight, % of body fat, antebrachium, brachium, chest, waist, thigh circumference and abdomen thickness between pre and post treatment in both group. Especially, body weight and % of body fat significantly reduced in the subjects treating the seaweed extract than those treating the placebo. There were significant decrement in total cholesterol and LDL whereas increment in HDL and TBIL in the control group, but no significant difference in the placebo group. In conclusion, there were 7.6% of body fat reduction during 4 weeks of aerobic exercise and 21% of body fat reducement in combination of topical seaweed treatment and exercise, respectively. These results suggest that the topical treatment of seaweed extract should be very effective for fat breakdown. Especially, the body fat breakdown maximized in the combination with the topical seaweed extracts treatment and the aerobic exercise.

인체 유방암종에서 Cyclic-Dependent Kinase Inhibitor, p27^Kip1 발현의 의의

송상용,김덕환,서연림,고영혜,김대식,남석진,양정현 대한병리학회 1998 Journal of Pathology and Translational Medicine Vol.32 No.12

어린이公園 利用者 特性에 關한 硏究 : 서울市 瑞草江南區를 中心으로

徐周煥,崔現翔 慶熙大學校 1993 論文集 Vol.22 No.-

For this study a survey was carried out about Seocho 3 children´s playground, Bangbae 1 children´s playground, Hakdong children´s playground, Yeoksam 3 children´s playground, Yeoksam 5 children´s playground which was located in Seocho-Gu and GangNam-Gu. This study had valued the facility level of park by means of Diversity Indices and had analysed the individual consciousness and the use characteristic of users, the change of enticing area and maximal service distance of each park by analysis of using route, the satisfaction level of user. The chief factors to tell on the utilization of park have been extracted as follows: In the result of analysis about satisfaction level by Diversity Indices(D.I.) is showed that the facilities of Bangbae, Yeoksam5 and Hakdong park are relatively various in the kind and figure. The using rate within 300m of all the park users is higher than the occurence rate. And the enticing area of the school age is clearly longer than the pre-school age. The enticing area of each park is decided into the sphere that is showed radical change of the enticing rate. The reasons which decides use satisfaction level on the each park are showed the use satisfaction level, the kind and the number of play facilities. The reasons which decide use satisfaction level of children´s playgrounds are showed use satisfaction of play facilities, D.I. of park facilities and D.I. of play facilities.

수목장(樹木葬)의 특성에 관한 고찰

서주환,최현상,정해천,승지현 경희대학교 디자인연구원 2005 예술· 디자인학연구 Vol.8 No.2

To secure a space for graveyard in a funeral has become one of the new issues in Korea. This caused the problems of graveyard shortage, destruction of national landscape, inroad of territory, and ecological environment. However, In eco-friendly method of funeral, the Woody Plant Funeral is a new form of Funeral to bury the ashes of the deceased under the wood so it participate with eternal life in wood and forest by provision of nature(wood and people return to nature to be born in nature). The purpose of this paper is to explain one of the counterplan which the Woody Plant Funeral solve graveyards problem.

비집속빔을 이용한 CO_2 레이저 빔 조사강화

서정,이제훈,강희신,김정오,이문용,오상진,이규현 한국레이저가공학회 2003 한국레이저가공학회지 Vol.6 No.2

Defocused CO_2 laser beam irradiation strengthening of 60kgf/㎟ grade steel sheet was investigated to obtain the tensile strength similar to that of fully penetrated one by the focused beam. The melted line width by the defocused beam was 3∼4 times larger compared to that of the focused beam. However, the increase of tensile strength with 1 line irradiation by the defocused beam was similar to that of 2∼3 lines by the focused beam. The increase(37.6%) of bending strength with 1 line by the defocused beam was higher than the increase(12.9%) of tensile strength. Also, the effect of cooling gas to strengthening was observed.

GIS를 활용한 효율적인 농촌경관관리구역 설정에 관한 연구

서주환,최현상,변성진,안재홍,양희승 경희대학교 부설 디자인연구원 2002 예술· 디자인학연구 Vol.5 No.1

Land use and social, cultural and environmental safety, which are adapted to natural environment, based on the traditional agricultural society, are on the verge of collapse because our rural community was developing around economy value. Rural landscape has not been certified compared with urban and natural landscape in importance by the standard of functional aspect, economic value and use demand, so cultural, historical, traditional and agricultural landscape native to rural community are not evaluated exactly. The Purpose of the study is a efficient plan and management for a essential rural landscape. Therefore We Make out a landscape diagram for efficient landscape plan and management and Selection of the Rural Landscape Management Area.

브러시리스 DC 모터의 코킹토크 저감 대책

서기영,이현우,문상필,강욱중 慶南大學校 附設 工業技術硏究所 1999 硏究論文集 Vol.17 No.-

본 연구에서는 정밀, 소형제동에 사용되는 브러시리스 DC모터의 정밀 운전시 문제가 되는 코킹 토크의 저감을 위하여 코킹 토크 형성에 관한 특정식을 유도하여 그 성질을 파악하고 특정식을 토대로 코킹 토크저감을 위한 설계법을 제안하였다. The Paper characteristics equation of cogging torque is induced to learn this characteristics and on the ground of this equation, the design method is proposed for reducing cogging torque which is the problem to precisely drive DC brushless motor used in precise control system.

간호사의 임상 실무 경험

서문자,손행미,강현숙,권성복,김주현,박영숙,이은희,임난영,조경숙,지성애 성인간호학회 2002 성인간호학회지 Vol.14 No.4

purpose: This study was conducted to describe qualitatively the entities of nurse's experiences in general hospitals and to suggest basic data guiding research on developing Standards of clinical nursing practice in Korea. Method: Fourteen nurses working at general hospitals with over 300 beds in Seoul were interviewed in-depth until saturation using tape-recorders and transcription. Result: The central theme of clinical nursing practice experienced by subjects was "being with clients" that means accepting client's personal character, solving client's needs and providing client-centered nursing. A also "being with clients" was felt to be the responsibility of nurses which was learned from their nursing schools. The nursing strategies performed in order to be with patients were proving skillful nursing techniques, accepting, educating, emotional support, advocating, and self-reflecting, the subjects experienced somewhat problematic affects such as difficulties in interpersonal relationship, work overload, negative image of nursing, deficit of self-confidence for nursing actions, poor working conditions, and unfair treatment. Nurses at the hospital practiced with pride when they felt that they were accepted by clients. Conclusion: Further research is needed to analysis problems in clinical practice and the comparison of nurses' experiences of clinical practice, with nurses' experiences in various settings.

의정부시의 도시경관 기초자료 도출을 위한 주민의식 조사

서주환,최현상,승지현,박대우 경희대학교 디자인연구원 2004 예술· 디자인학연구 Vol.7 No.1

As various values become respected with changing paradigm. Our modern cities are characterized by indetermination ever. Change of life style make people concerned more about city environment. Our contemporary society has gradually respected and sportlighted the importance of human being as principal, and conventional awareness about urban environment has been changing owing to higher interest in 'a life quality in the city' than ever, We have beer preferred an urban environment planning to make city more sustainable and agreeable scape. But nowaday, resident's demands actively reflect on city planning them ever to make satisfaction in city life. This study aims to investigate positive landscape factors and create urban image-map in order to find out instinctive data use on urban environment planning. It can be introduce sustainable and agreeable city scape in Uijung-Bu.