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유원희(You Won-Hee),신유정(Shin Yu-Jeong) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Nonlinear dynamic systems are well known to contain special additional phenomena compared with linear dynamic systems. Railway wheelsets are good example to explain such a special phenomena. Generally railway wheelset has two kinds of limit speed. One is linear limit speed and the other is nonlinear limit speed. The nonlinear limit speed is lower than linear limit speed. The methods to obtain nonlinear limit speed, experimental approach and analytical one based bifurcation theory. But the bifurcation theory is not simple. In this study, the perturbation method was introduced to nonlinear limit speed of wheelset. Moreover, the parametric study for limit speed was conducted.
유산소 운동이 비만유전자(β3-AR gene) 다형성 특성이 다른 비만아동의 체력요인에 미치는 영향
유원희(Yoo Won-Hee),이재구(Lee Jae-Koo) 한국체육과학회 2007 한국체육과학회지 Vol.16 No.3
The purpose of this study is to identify the effects of aerobic exercise as the polymorphism in the β3-AR gene of obese children. For this study, 30 children, who is over 25% BMI and do not regularly exercise, were randomly assigned to 2groups. One group is normal group(Trp64Trp, 23children) and the other one is mutation group(Trp64Arg, 7children). Body composition factors and physical abilities were measured before and after exercise program. Blood was collected from vein about 10㎖ and blood analyses were requested. Paired t-test and one-way repeated measured ANOVA were used as the statistical analysis, and significance was accepted at p<.05. From the statistical analysis results for the body composition, and physical fitness, the following conclusions could be obtained. After aerobic exercise, body compositions of obese children are significantly changed in height (+0.4%), BMI (-1.3%), body fat mass (-2.3%), percent body fat(-2.0%)(p<.05). Physical fitness of obese children are significantly changed in muscular strength (+12.9%), muscular endurance (+23.3%), flexibility(+11.8%)(p<.05). After aerobic exercise, there was significantly changed in hight(+0.4%), BMI (-1.2%), body fat mass (-2.4%), percent body fat(-2.0%), muscular strength (+16.2%), muscular endurance (+16.0%), flexibility (+14.0%), cardiovascular endurance (-3.7%), The difference within groups was only muscular strength. In this study, aerobic exercise was found more effective for the enhancement of body composition, blood lipid, physical fitness The β3-AR in normal group was more different after exercise to compare with gene alteration group so that obese is more influence for gene.
유원희(You Won-Hee),구동회(Koo Dong-Hoi),서정원(Seo Jeong-Won) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
In relation to the connection of South-North railway(Kyongui-Line), the operating speed of the train in Kyongui-Line was reviewed. Due to the insufficient maintenance to support on the track of north section of Kyongui-Line, it is very old. The plan that the train run in the north section faster than present time was studied. Finally, the electric power required in the north section was predicted.
유원희(Won Hee You),한성호(Song Ho Han),김남포(Nam Po Kim),김길동(Gil Dong Kim),박광복(Kwang Bok Park) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
This report was studied about system design of tilting car for speed up for conventional railroad of KNR. The maximum operating speed of Kyun-Pu line was recorded a 140Km/h by saemaul train at 1985 and the average speed its is 107Km/h now. The chungang line, janghang line and honam line of KNR had rebuilt to the electrified line for operation of tilting train. This report was described about the operation status of advanced countries, the operation situation of trains of KNR, system design for operation and speed up by EMU tilting train on the conventional railroad in the future.
유원희 ( Won Hee Yu ),임희석 ( Heui Seok Lim ) 한국컴퓨터교육학회 2015 한국컴퓨터교육학회 학술발표대회논문집 Vol.19 No.1
실제 온라인 학습 시스템에서 획득되는 로그데이터들 중에서 사용자 프로파일로 사용될 수 있는 요소를 선택하였다. 로그데이터들은 사용자들이 학습시스템에서 활동한 내역으로 구성되어있으며, 다양한 로그데이터들 중에서 실제 중요한 요소를 선택하기 위하여 의미 없다고 생각되어지는 로그들과 중복성이 강한 로그데이터를 제거하였다. 선택된 요소를 검증하기 위하여 분류기를 사용하여 선택된 요소들이 전체 로그데이터들에 비해서 어느 정도의 성능향상과 신뢰도향상을 가져오는지에 대하여 검증하였다. 실험결과 분류기의 성능이 2%정도 증가 하였으며, 신뢰도가 유의미한 신뢰수준까지 증가하였음을 보였다.
FIDIC Silver Book을 활용한 해외건설공사 계약단계 리스크 평가모델
유원희(Yoo, Won-Hee),현창택(Hyun, Chang-Taek),문현석(Moon, Hyun-Seok),김종협(Kim, Jong-Hyeob) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.11
As orders for industrial plant projects increase, mainly in the Middle East and Africa, many domestic Korean companies are entering the international construction market. The total value of orders that domestic companies received from overseas is increasing due to participation in huge Engineering, Procurement and Construction EPC projects. The ability to manage potential risks is essential in maximizing revenue through overseas construction projects. Contractors need to scrutinize the contract documents, since the risks are distributed to each party through them. However, if there is insufficient expertise in overseas construction contracts, it is impossible to assess systematic risk thoroughly. Therefore, a Contractual Risk Evaluation Model that is based on the conditions of FIDIC Silver Book contract was proposed in this study to evaluate contractual risks of EPC/Turnkey construction projects received by Korean companies from overseas. The model proposed in this study can be used as a decision making tool in the contracting stage of international construction projects on a EPC/Turnkey basis. In addition, the assessment items and evaluation criteria presented in the model development process are expected to be used as checklist by contractors.
유원희(You, Won-Hee),허현무(Hur, Hyun-Moo),고효인(Koh, Hyo-In),박준혁(Park, Joon-Hyuk),최용운(Choi, Yong-Woon) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.1
There are many curves in Seoul subway system. Therefore, the noise from subway system in curved line gives displeasure to passenger. The subway noise in curved line is affected not only by rail condition but also wheel condition and dynamic characteristics. The railway curving noise can be divided into 2 categories. The first is the noise due to stick-slip between wheel tread and rail head, and the second is one by wheel flange contact on rail side. Because of these phenomena - stick-slip and wheel flange contact - wheels are worn seriously. In this study the curving noise was reviewed by using eigen-mode of wheel and waterfall plot which shows noise level in time-frequency domain. And also those were reviewed in viewpoint of stick-slip noise and wheel flange contact noise. Finally, the relationship between curving noise and wheel wear was studied.