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.

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.

LTCC 보호층 형성에 따른 박막 전극패턴에 관한 연구

김용석,유원희,장병규,박정환,유제광,오용수,Kim, Yong-Suk,Yoo, Won-Hee,Chang, Byeung-Gyu,Park, Jung-Hwan,Yoo, Je-Gwang,Oh, Yong-Soo 한국재료학회 2009 한국재료학회지 Vol.19 No.7

Metal thin film patterns on a LTCC substrate, which was connected through inner via and metal paste for electrical signals, were formed by a screen printing process that used electric paste, such as silver and copper, in a conventional method. This method brought about many problems, such as non uniform thickness in printing, large line spaces, and non-clearance. As a result of these problems, it was very difficult to perform fine and high resolution for high frequency signals. In this study, the electric signal patterns were formed with the sputtered metal thin films (Ti, Cu) on an LTCC substrate that was coated with protective oxide layers, such as $TiO_2$ and $SiO_2$. These electric signal patterns' morphology, surface bonding strength, and effect on electro plating were also investigated. After putting a sold ball on the sputtered metal thin films, their adhesion strength on the LTCC substrate was also evaluated. The protective oxide layers were found to play important roles in creating a strong design for electric components and integrating circuit modules in high frequency ranges.

Hybrid Sol을 이용한 박막 유전체 제작

김용석,유원희,장병규,오용수,Kim, Yong-Suk,Yoo, Won-Hee,Chang, Byeung-Gyu,Oh, Yong-Soo 한국재료학회 2007 한국재료학회지 Vol.17 No.4

The purpose of this study is to evaluate the thin fihn dielectric made of hybrid sol, which consist of barium titanate powder, polymeric sol and other polymers. This sol will be used dielectric applied to small, thin electric passive components such as MLCC(Multi Layer Ceramic Condenser), resister, inductor. This sol is composed of mixed fine barium titanate powder and polymeric sol including Ba, Ti-precursor, solvent, chelating agent, chemical reaction catalyst, the additive sols to improve fired densification and temperature reliability. First at all, we mixed hybrid sol to be dispersed and be stabilized by ball milling for 24hrs. By spin coating method, we makes thin film dielectric on the convectional green sheet for MLCC. After heat treatments, we analyzes the structure morphology, physical, electrical properties and X5R Temperature properties.

기존선 구간에서의 탈선안전도 향상 방안 연구

김용원(Yong Won Kim),엄범규(Beom Gyu Eom),유원희(Won Hee Yoo),이희성(Hi Sung Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.6

기존선 속도향상 시에 탈선안전도를 고려한 기존선 구간별 최대 운행가능속도에 대한 실용적인 기준을 제시하여 기존선의 곡선부 및 완화곡선부 통과 시 속도를 향상시켜야 한다. 본 연구에서는 탈선의 위험도가 높은 곡선부 통과하는 열차의 고속향상을 도모하기 위하여 실제 선로조건인 동대구-남성현 상ㆍ하행 구간에서의 곡선부 구간별 통과 시 탈선안전도에 미치는 영향을 살펴보았다. 곡선반경별 주행속도를 실제 선로 조건에서의 기존 속도 대비 5-20% 향상시켜 탈선안전도 해석을 수행하였다. When a railway vehicle passing through curves & transitions, the running speed must improve by proposing the practical about maximum running possibility speed of each section on existing line considering derailment safety. In this paper, when the railway vehicle passing through curves of actual track conditions (Dongdaegoo-Namsunghyun up & down lines), the effect that has influence on the derailment safety is examined to devise the high speed of the vehicle which passing through curves which risk of the derailment is high. The derailment safety analysis is performed that the running speed by curve radius improves 5~20% compared with existing speed under actual track conditions.

마이크로파 소결법을 이용한 LTCC 기판 Post 전극 형성에 관한 연구

김용석,이택정,유원희,장병규,박성열,오용수,Kim, Yong-Suk,Lee, Taek-Jung,Yoo, Won-Hee,Chang, Byeung-Gyu,Park, Sung-Yeol,Oh, Yong-Soo 한국마이크로전자및패키징학회 2007 마이크로전자 및 패키징학회지 Vol.14 No.4

This study is focused on the effect of the surface properties for the post electrode, which is used in pad formation consisted of SMT such as IC, passive component, combined with fired LTCC substrate, We carried out the surface microstructure of sintered electrode and the basic reliability evaluations with sample fired by microwave sintering to solve the problems occurred in post electrode by electric sintering. We evaluated surface densification status of post electrode according to various conditions of microwave sintering. In additions, it is obtained strong effect on blister improvement of post electrode because of over-sintering and the insufficient out gas in bum out process. As a result of adhesion strength, we confirmed $44.3N/mm^2$ in microwave sintering and $34.5N/mm^2$ in electric sintering, respectively. This result will be used for the basic reliability test. Finally, microwave sintering seems to be economic in process time with 30 min compared to electric sintering with 10 hr. In terms of Mass production and efficiency, microwave sintering are excepted to be higher than electric sintering. LTCC 기판제작에 있어서 Post 전극형성은 실제 IC 및 수동부품을 탑재하는 Pad 형성 부분으로 전극 표면의 특성에 큰 영향을 미치게 된다. 본 연구에서는 일반적인 전기로를 이용한 post 전극 소성시 발생되는 문제점들 개선하여 마이크로파 소결을 통한 전극 미세 구조의 치밀화 및 이에 따른 신뢰성 기초 평가를 진행하였다. 일반적인 전기로와 마이크로파 소결 조건에 따른 전극과 LTCC 세라믹 상태를 평가하였다. 또한 과소성 및 탈바인더 공정시 Out gas 불충분에 의한 전극 부풀림 현상을 개선할 수 있는 효과를 얻을 수 있었으며 실제 solder ball 형성후 실장형 전극의 고착강도를 측정한 결과 기존 전기로에 비해서 30% 고착강도가 증가 하였다. 또한 소결시간을 기존 전기로 10시간에 비해 30분 정도에서 소결 공정이 이루어지므로 95%정도 시간을 단축시킬 수 있음을 확인하였다. 이는 소성로 설계를 통한 양산성, 효율성에 크게 증대되리라 예상된다.

수냉 시스템을 고려한 원통형 전자기식 액추에이터의 열특성 분석

유다영(Dayoung Yoo),우정현(Jung-Hyun Woo),박영필(Young-Pil Park),박노철(No-Cheol Park),박경수(Kyoung-Su Park),백윤수(Yoon Su Baek),최종현(Jong Hyun Choi),유원희(Won Hee You) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.4

CTOC에서 복사 전파

김기태(Kim Ki-Tae),김제민(Kim Je-min),유원희(Yoo Won-Hee) 한국컴퓨터정보학회 2007 韓國컴퓨터情報學會論文誌 Vol.12 No.1

자바 바이트코드는 다양한 장점을 갖지만, 실행속도가 느리고 분석이 어렵다는 단점이 존재한다. 따라서 네트워크와 같은 실행환경에서 효과적으로 실행되기 위해서는 최적화된 코드로 변환이 요구된다. 최적화된 코드로 변환하기 위해 CTOC가 구현되었다. CTOC는 기존의 바이트코드를 이용해서 CFG를 생성한 후 분석과 최적화를 위해 SSA Form을 생성하였다. 하지만 SSA Form으로 변환하는 과정에서 ?-함수의 삽입으로 인해 노드의 개수가 늘어나는 현상이 발생하였다. 노드의 개수를 줄이기 위한 한 가지 방법으로 SSA Form에서 적용 가능한 최적화인 복사 전파를 수행하였다. 복사 전파란 하나의 변수 값이 다른 변수의 값으로 복사하는 과정이다. 복사 전파에 의한 변환은 변환 자체로는 큰 효과를 나타내지 못하는 경우가 존재하지만 이후 최적화 과정에서 변수가 사용되지 않는 경우 해당 변수에 대한 복사식을 제거할 수 있는 가능성을 제공하기 때문에 중요한 과정이다. 본 논문은 SSA Form에서 좀 더 최적화된 코드를 얻기 위한 복사 전파 수행을 보인다. Although the Java bytecode has numerous advantages, there are also shortcomings such as slow execution speed and difficulty in analysis. Therefore, in order for the Java class file to be effectively executed under the execution environment such as the network, it is necessary to convert it into optimized code. We implements CTOC. CTOC generated CFG using the existing bytecode then created the SSA Form for analysis and optimization. However, due to insertion of the ?-function in the process of conversion into the SSA Form, the number of nodes increased. As a means of reducing the number of nodes, we performed copy propagation, which is an optimization method applicable to the SSA form. Copy propagation is the process of a value of a variable being copied to another variable. There are cases where conversion due to copy propagation alone does not yield significant effects. However, when variables are not used in the later optimization stages, copy propagation provides a means for eliminating the copy statement for the corresponding variable, making it an important step. This paper shows the copy propagation to obtain a more optimized code in SSA Form.

CTOC에서 죽은 코드 제거 구현

김기태(Kim Ki-Tae),김제민(Kim Je-min),유원희(Yoo Won-Hee) 한국컴퓨터정보학회 2007 韓國컴퓨터情報學會論文誌 Vol.12 No.2

자바 바이트코드가 많은 장점을 갖지만, 수행 속도가 느리고 분석하기 어렵다는 단점이 존재한다. 따라서 자바 클래스 파일이 네트워크와 같은 실행 환경에서 효과적으로 실행되기 위해서는 최적화된 코드로 변환이 요구된다. 최적화된 코드로 변환하기 위해 CTOC를 구현하였다. 정적으로 값과 타입을 결정하기 위해 CTOC는 변수를 배정에 따라 분리하는 SSA Form을 사용하였다. 또한 문장의 표현을 위해 트리 구조를 사용하였다. 하지만 SSA Form 변환 과정에서 ?-함수의 삽입에 의해 오히려 노드의 수가 증가하게 되었다. 본 논문은 SSA Form에서 더욱 최적화된 코드를 얻기 위해 죽은 코드를 제거하는 과정을 보인다. 각 노드에 대해 새로운 live 필드를 추가하고 트리 구조에서 죽은 코드 제거 과정을 수행한다. 실험 결과를 통해 죽은 코드 제거 후 상당한 노드의 수가 줄어든 것을 확인할 수 있다. Although the Java bytecode has numerous advantages, there are also shortcomings such as slow execution speed and difficulty in analysis. Therefore, in order for the Java class file to be effectively executed under the execution environment such as the network, it is necessary to convert it into optimized code. We implements CTOC. In order to statically determine the value and type, CTOC uses the SSA Form which separates the variable according to assignment. Also, it uses a Tree Form for statements. But, due to insertion of the ?-function in the process of conversion into the SSA Form, the number of nodes increased. This paper shows the dead code elimination to obtain a more optimized code in SSA Form. We add new live field in each node and achieve dead code elimination in tree structures. We can confirm after dead code elimination though test results that nodes decreases.

양상논리를 포함한 BML 스펙 확장

김선태 ( Seon-tae Kim ),김제민 ( Je-min Kim ),박준석 ( Joon-seok Park ),유원희 ( Won-hee Yoo ) 한국정보처리학회 2012 한국정보처리학회 학술대회논문집 Vol.19 No.1

검증에 사용하는 명세는 대부분 1차 술어 논리(First Order Logic)로 이루어져 있다. 1차 술어 논리가 자연언어 대부분을 표현하지만 표현하지 못하는 부분도 존재한다. 이를 해결하기위해 양상논리(Modal Logic)를 추가한 명세방법이 존재하지만 간접적인 방법으로만 존재할 뿐 이다. 본 논문에서는, 양상논리를 이용한 명세의 직접적인 표현을 위해 BML(Bytecode Modeling Language)을 확장한다. 이를 통해, 명세정보 표현의 정확성을 향상시킨다.