한국인 간질환에서 TT virus 감염의 유병률

원선영(Sun Young Won),서동진(Dong Jin Suh),송병철(Byung Cheol Song),이한주(Han Chu Lee),정영화(Young Hwa Chung),이영상(Yung Sang Lee) 대한내과학회 2000 대한내과학회지 Vol.59 No.6

N/A Background : TT virus (TTV), an unenveloped single-stranded DNA virus, has been reported in patients with non A-G posttransfusion hepatitis in Japan. Since it has been distributed globally afterward, it was suggested to be a possible causative agent in a proportion of cases with cryptogenic acute and chronic hepatitis. Therefore, we investigated the prevalence and clinical significance of TTV infection in Korean patients with acute and chronic liver diseases. Methods : TTV DNA was determined by polymerase chain reaction with semi-nested primers in sera of 94 patients with liver diseases: 38 with non-ABC liver diseases, 33 with HBV infection and 23 with HCV infection. Results : TTV DNA was detected in 7.9% of non-ABC group, 6.1% of HBV group and 13.0% of HCV group. The positive rates of TTV DNA among three groups were not different statistically. The prevalences of TTV in acute and chronic liver disease were not different. For our study, six out of eight patients with positive TTV DNA had a past history of transfusion. Conclusion : Although TTV infection exists in Korea, it seems unlikely that the virus is responsible for liver diseases of unknown etiology.(Korean J Med 59:612-617, 2000)

1N 단일추진제 추력기 개발모델 인수수준 진동시험

원수희(Su-hee Won),김수겸(Su-kyum Kim),채종원(Jong-won Chae),한조영(Cho-young Han),전형열(Hyoung-yoll Jun),이준희(Jun-hui Lee),박수향(Su-hyang Park),이재원(Jae-won Lee) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.5

1N급 단일추진제 하이드라진 추력기 개발모델에 대한 인수수준 랜덤 진동시험이 수행되었다. 랜덤 진동시험은 기존 항공우주연구원의 1lbf 추력기의 시험절차를 참고하여 진행되었다. 랜덤 진동시험 결과로부터 1N급 추력기 개발모델로 구성된 이중추력기모듈의 고유진동수는 기준치를 훨씬 상회하였으며, 구조적으로 강건하다는 것을 확인하였다. 또한 진동시험 동안 추력기 내부 촉매의 손상은 없었으며, 이로 인한 연료공급 유로의 막힘 현상도 발생하지 않았다. Acceptance level random vibration test for development model of 1N-class monopropellant thruster has been performed. The random vibration test was carried out based on the KARI test procedure for 1lbf thruster. From the test results of random vibration, the natural frequency of the dual thurst module composed of 1N-class development model thrusters was much higher than the standard and the structural robustness was verified. The catalyst damage during the vibration test was not observed and the plugging phenomenon was not occurred either.

인공위성용 단일추력기 현황

한조영(Han, Cho-young),김수겸(Kim, Su-kyum),원수희(Won, Su-hee),채종원(Chae, Jong-won) 한국항공우주연구원 2013 항공우주산업기술동향 Vol.11 No.2

단일추진제 추력기는 우주개발 초창기인 1960년대부터 개발/사용되기 시작하였으나 상대적으로 높은 성능과 안정성으로 현재까지도 세계적으로 가장 널리 활용되고 있다. 대표적인 단일추진제로는 하이드라진, 과산화수소, HAN, ADN 등이 있는데 현재까지는 하이드라진 추력기가 대부분을 차지고 있으나 최근에 들어 친환경 추진제에 대한 연구도 활발하게 진행되고 있다. 본 논문에서는 향후 단일추진제 추력기 연구 방향을 결정하기 위한 기초자료로서 인공위성용 단일추력기 중 하이드라진 및 친환경 추력기에 대한 개발 현황을 소개하였다. Monopropellant thruster is a very old technology that has been used from 1960s, however, because of the relatively high performance and high reliability, monopropellant thrusters are still widely used for space propulsion system. The representative monopropellant is hydrazine, hydrogen peroxide, HAN and ADN. Until now most of the monopropellant thrusters use hydrazine but, recently many studies for green propellant are in proceeding. In this paper, development status of hydrazine and green propellant thrusters for satellite propulsion system will be introduced as a baseline data for monopropellant thruster development.

다관원통형 열교환기의 성능평가 방법 개발에 관한 연구

원세열(Won Se Youl),윤은섭,이한희(Lee Han Hee),Park Young Sheop 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5

As the operation time of heat exchangers is increased, the thermal performance of them is gradually decreased because of tube plugging in terms of fouling generated by water-borne deposits which is known to reduce the thermal efficiencies. Currently, thermal performance management of heat exchangers is more importantly presented. In nuclear power plants, the thermal performance evaluation has been analyzing in some safety related heat exchangers only. The performance evaluation method for shell and tube heat exchanger is required to improve the present method of performance criterion and film heat transfer coefficient calculation. This paper describes the developed thermal performance evaluation method for shell and tube heat exchangers and presents the result of performance evaluation applied for a regenerative heat exchanger in a nuclear power plant.

P-기법을 이용한 터보분자펌프 로터의 구조해석 및 형상최적설계

원보름(Bo Reum Won),정해영(Hae Young Jung),한정삼(Jeong Sam Han) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.10

터보분자펌프는 회전하는 로터 블레이드의 고속회전을 통해 진공을 생성하는 고진공, 고청정 펌프로 로터의 고속회전에 따른 구조적 안전성이 우선 평가되어야 한다. 본 논문에서는 터보분자펌프의 배기성능 및 구조적 안전성에 영향을 미치는 인자 중에서 블레이드 각도, 길이, 블레이드가 시작되는 부분의 라운드 크기, 회전속도를 선정하여 그들의 변화에 대한 변위 및 응력 응답을 관찰하는 민감도 평가 및 최적설계를 수행하였다. 일반적인 유한요소해석기법인 H-기법이 아닌 형상요소해석기법인 P-기법을 사용함으로써 복잡한 형상의 유한요소생성 모델링 시간을 단축시켜 해석의 효율성을 높일 수 있었다. In recent times, turbomolecular pumps (TMPs) have been used frequently to generate and maintain high and clean vacuum. Because of the high-speed rotation of the rotor, its structural safety should be treated as the first design concern. This paper presents the structural analysis and optimization of rotor blades of a TMP. To increase the numerical efficiency in the finite element modeling and analysis, the P-method provided in Pro/ENGINEER was used for simulation. The structural responses for several types of rotor blades were investigated, and the effects of the blade angle, blade length, and round size are thoroughly studied for each type of TMP blade. In addition, structural optimization to reduce and even the maximum stress at each stage of the TMP by changing the size of rounds between the blade and the hub was performed very successfully by using the P-method.

Pulsed Load에서 DC/DC컨버터의 출력필터 구현

원유준(Won Yu-June),이시형(Lee Si-Hyoung),한수영(Han Su-Young) 대한전자공학회 2019 대한전자공학회 학술대회 Vol.2019 No.11

고구마 기계화 표준재배모델 개발을 위한 농가 실태조사 - 정식, 제초, 방제 -

원진호 ( Jin Ho Won ),한준영 ( June Young Han ),조용진 ( Yongjin Cho ),김대철 ( Dae Cheol Kim ) 한국농업기계학회 2023 한국농업기계학회 학술발표논문집 Vol.28 No.2

고구마는 우리나라에서 대표적인 식량작물로써 큰 인기를 누리고 있는 작물 중 하나이다. 통계청 자료에 따르면 고구마는 최근 5년간 생산량과 재배면적이 증가하는 추세이며, 2021년 기준 경기·충남·전북·전남 지역에서 우리나라 고구마 생산량의 약 75%를 점유하고 있다. 한편 물가 상승으로 인한 인건비의 상승과 농업인구의 감소 및 고령화 문제가 발생함에 따라 고구마 농업에도 큰 문제로 야기되고 있는 실정이다. 이와 같은 문제점을 해결하기 위해 고구마 기계화의 가속화가 필요하다. 따라서 본 연구에서는 고구마 기계화 가속화를 위한 정식, 제초, 방제 과정의 실태조사를 실시하였다. 정식과정 전에는 본 밭 준비과정을 수행하는데, 본 밭 준비의 경우 트랙터에 로터베이터를 장착하여 경운작업과 트랙터 부착형 시비기를 이용한 시비를 수행한다. 시비 후 토양경운을 재수행하여 토양 교반을 실시하며, 경우에 따라 토양 진압을 수행한다. 그 후 트랙터에 두둑성형기를 장착하여 두둑 성형을 실시하고 고구마 정식을 수행하게 된다. 고구마 정식의 경우 고구마의 수확량을 늘리기 위해 고구마 순을 눕혀서 정식하는 개량수평심기의 형태로 정식을 수행하기 때문에 기계화가 어려워 대부분 인력으로 수행하게 된다. 정식 후 비닐 멀칭기를 이용하여 비닐 멀칭을 수행하며, 배토기를 이용하여 비닐 멀칭 고정 작업을 수행한다. 비닐 멀칭 3 ~ 4일 후 정식 된 고구마 순의 뿌리가 안정화되면 멀칭 비닐을 뜯고 고구마 순 꺼내기 작업을 수행한다. 정식 후 관리는 제초 및 방제로, 제초제 및 인력을 이용하여 제초작업을 수행하고, 방제기를 이용하여 방제작업을 수행하게 된다. 본 연구를 통해 고구마 기계화 표준재배모델 개발 전농가 현황조사자료로써 활용 가능 할 것으로 판단되며, 추후 정식 단계까지의 건의 및 애로사항을 취합하여 고구마 기계화의 가속화에 활용 할 것이다.

아위느타리버섯 발이량 조절을 위한 병재배사의 상대습도 및 CO₂농도 조절 효과

원선이(Seon Yi Won),주영철(Young Chul Ju),김정한(Jeong Han Kim),박경열(Kyeong Yeol Park) 한국생물환경조절학회 2008 한국생물환경조절학회 학술발표논문집 Vol.17 No.1

대학 교직원의 동호인 활동에 따른 생활 만족도에 관한 연구

한장우(Han Jang Woo),권욱동(Kwon Wook Dong),원영신(Won Young sin) 한국여성체육학회 1998 한국여성체육학회지 Vol.12 No.-

The purpose of this study was to subdivide the consciousness and an attendance type for which is the part of the staff of university. Also, it was to compare and analyze the life satisfaction for the staff of university along the kind of the work. To achieve the purpose of this study, self-administered questionnaire was used. The subjects were 393 from 7 private universities. The factor of the life satisfaction was divided 4 categories into the degree of the satisfaction in the work, relation, leisure and health. The Mean, Frequency and Standard deviation were analyzed using SPSS software program. In addition, T-test, ANOVA were used to inspect the hypothesis of this study, and Duncan multiple comparison for the post-inspection. We had the following results. 1. The background for the staff of university is following(sex, period of office, pay, status and university). 1) There was the significant difference between the groups for the degree of life satisfaction in the category of work, relation and health, but no leisure along the sex. 2) There was the significant difference among the groups between groups for the degree of lived-satisfaction in the category of work, leisure and health. but no relation along the status. 3) There was the significant difference among the groups for the degree of life satisfaction in the category of work, leisure and but no relation and health along the period of office. 4) There was the significant difference among the groups for the degree of life satisfaction in the category of work, leisure and health, but no relation along the pay. 5) There was the significant difference among the groups for the degree of life satisfaction in the 4 categories along the university. 2. There was no significant difference among the groups for the degree of life satisfaction in along the type of work. 3. There was the significant difference among the groups for the degree of life satisfaction in the category of relation, leisure and health but, no work along the type of an association of like-minded persons.

중년여성의 건강증진을 위한 단기교육과 강화요법 프로그램의 효과

김원옥 ( Won Ock Kim ),원정숙 ( Jeong Sook Won ),현경선 ( Kyung Sun Hyun ),한상숙 ( Sang Sook Han ),김귀분 ( Kwuy Bun Kim ),이명희 ( Myung Hee Lee ),박영미 ( Young Mi Park ) 경희대학교 동서간호학연구소 2004 동서간호학연구지 Vol.10 No.1

The purpose of this study was to examine the effects of the short term education and reinforcement program to health promotion in women in mid-life. This study has been done between February and April, 2004 and the subjects of the study were 26 women in mid-life. The treatment intervention was applied during total 8 weeks as 5 days for the short term education and 7 weeks for reinforcement with 1 time per a week. The short term education included health education for menopause, effect of exercise, healthy diet, management of stress and management of chronic illness and stretching exercise and recreation. The collected data were processed using the SPSS Win(12.0) program and analyzed using Wilcoxon Signed Ranks Test. The result of this study are as follows: 1. The short term education and reinforcement program significantly effected on the total cholesterol, HDL-cholesterol, triglyceride. 2. The short term education and reinforcement program significantly effected on the anxiety, but not depression. 3. The short term education and reinforcement program non significantly effected on the sleep disturbance and self-efficacy of exercise. 4. The short term education and reinforcement program significantly effected on the practice of healthy life. In conclusion, the short term education and reinforcement program effected on the physical health index, anxiety and practice of healthy life.