Effect of Polymer Aggregation on Photovoltaic Performance in Polymer Solar Cell

Juwon Oh(오주원) 한국고분자학회 2023 한국고분자학회 학술대회 연구논문 초록집 Vol.48 No.1

KTX용 2경간 연속교량의 동적거동 및 공진감소

오주원(Oh Juwon) 대한토목학회 2008 대한토목학회논문집 A Vol.28 No.1A

본 연구에서는 경부고속철도상의 대표적인 교량인 2경간 연속보 형태의 고속철도 교량에 대하여 동적거동을 해석하고 공진발생의 감소방안을 제시하였다. 하중은 한국형 고속철도하중인 총길이 380.15m의 TGV-K 열차(2P+18T)가 일정한 속도로 이동하는 것으로 하였다. 동적거동을 모사하는 지배방정식은 질량과 강성이 분포된 연속계에서 만들어진 편미분방정식을 이용하여 구하였으며 Duhamel 적분을 이용한 모달계수의 처리를 수반하는 모드중첩법을 이용하여 동적해석을 수행하였다. 열차의 주행속도에 관계없이 동적거동을 급격히 감소시킬 수 있는 지간장이 존재하였으며 지금까지 연구된 단순보 형태의 교량에서 분석된 결과와는 달랐다. 열차의 주행속도에 의존하여 동적응답이 급격히 증가되어 공진현상을 일으키는 경우에도 공진을 감소시킬 수 있는 여러 방안들을 제시하였다. Dynamic behaviors of the two-span continuous bridge which is one of prototypes on Gyoung-Bu high-speed railway are analyzed and some methods for reducing the resonance of the bridge are proposed. The bridge is modeled as a two-span continuous beam and the load is a vehicle of TGV-K (2p+18T) with length of 380.15 meter traveling on the railway bridge at some constant velocity. The equations governing the dynamic behaviors of the bridge are partial differential equations produced by using a system with distributed mass and elasticity. The analysis of the governing equations is performed by the mode superposition method which has modal coordinates solved by Duhamel's integral. Without considering the train velocity the dynamic reponses can be greatly reduced at some special lengths of bridge. It is different from the results of simple bridges researched so far. When the dynamic responses increase rapidly to make a resonance phenomenon depending on the train velocities, the several methods are proposed to deduce the resonance.

구조물의 손상평가를 위한 인공신경망의 특성평가

오주원(Oh, Juwon),허광희(Heo,Gwanghee),정의태(Jung,Euitae),손동진(Sohn, Dongjin),오지윤(oh,,Jiyoun) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2

If you receive a damaged structure that will change the dynamic characteristics of structures. The dynamic nature of these structural changes for the structure damaged by using an artificial neural network to identify the location and size were. In this paper, an artificial neural network training and validation for the same damage as a change of load when using the given input for damage assessment have seen a good looking magazine. Artificial neural networks for learning, and qualified by the same load location and size of the damages it seeks. However, due to load changes regarding the location and size of the damage did not find it.

모달 Updating을 통한 소형 모형 사장교의 Structural Integrity 개발

허광희(Heo, Gwanghee),오주원(Oh, Juwon),정기수(Jung, Kisoo),정의태(Jung, Euitae) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.1

The dynamic characteristics of bridge structures acquired by modelling are determined by their rigidity and mass calculated on their geometrical dimension. In the case of a small model bridge, a tiny bit of change in its rigidity and mass makes a big difference in its structural features. Normally a cable-stayed bridge is designed to have the load of the mid-part of its main span supported by the rigidity of cables, which thus absolutely determines its dynamic characteristics. So, an exact FE modelling is required, but there are some errors due to the limit of numerical analysis, which accordingly necessitates an experimental modal updating as a complement. This particular research aims to improve the structural integrity by the modal updating as a result of comparing two sets of different dynamic characteristics, one from a FE analysis, the other from an experiment. That improvement was evaluated by the MAC value which resulted from the analysis of the relationship between error possibilities in proper vibration and their modes both before and after modal updating. The evaluation proved that the modal updating was valid as a way to improve the structural integrity of a small model cable-stayed bridge..

턴키 제도를 모사한 환경공학 설계과목의 협동학습 적용사례

김건하(Geonha Kim),오주원(Juwon Oh),이학수(Hacksoo Lee) 한국공학교육학회 2006 공학교육연구 Vol.9 No.4

본 논문에서는 한남대학교 토목환경공학과 4 학년 전공선택 과목인 상하수도공학에서 진행한 협동학습을 소개하였다 . 도시 비점원 처리시설을 설계하는 문제중심 학습을 실시하면서 토목구조물의 설계 - 시공 - 감리를 통합하여 수주하는 턴키 ( turn - key ) 제도를 모사하여 수업을 진행하였다 . 수강생 25 명을 4 개 조로 나누었으며 각 조를 각각 하나의 회사로 가정하여 사장 - 임원 - 사원에 이르는 직급을 정하게 하였다 . 발주 공사에 대한 설계개념 정립에서부터 공사비용의 산정 , 공정 계획 , 설계 , 응찰에 이르는 전 과정을 수업중 설명하였으며 비점원오염물질 처리시설물 수주를 위하여 각 조간 경쟁하도록 하였다 . 설계가 가장 우수하면서 입찰금액을 낮게 쓴 조가 공사를 수주하되 1 인당 예상 이익으로 과목의 성적을 평가하였다 . 강의 진행과 효과분석을 위하여 각 팀별로 1 명씩을 초점그룹으로 선택하였으며 중점적으로 학기 중 면담을 실시하여 수업에 반영하였다 . 학생들은 턴키 제도의 운용 , 인사고과에 대한 인식이 향상되었으며 수업의 긴장감을 효과적으로 높일 수 있었으며 , 복잡한 설계과제를 수행할 수 있었다 . In this research , a case study for cooperative learning practiced in a design class for environmental engineering was presented . Designing a treatment facility for urban diffuse pollution was a main problem given to the participants . Turn - key system for civil works were simulated throughout class works . Twenty five students were grouped into four virtual companies and assigned own position from chairperson to workers . Each group competed throughout establishing design concept regarding order , expense calculation , process distribution , actual calculation . Best design with lowest bidding won the first place . For evaluating class effectiveness , one student from each group were monitored thorough semester . Participants were improved for their understanding about company establishment , turn - key system management , awareness about personal management , and presentation skills . Tension of the class was effectively elevated as well .

모달 Updating을 통한 소형 모형 사장교의 Structural Integrity 개발

허광희 ( Heo Gwanghee ),오주원 ( Oh Juwon ),정기수 ( Jung Kisoo ),정의태 ( Jung Euitae ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1

The dynamic characteristics of bridge structures acquired by modelling are determined by their rigidity and mass calculated on their geometrical dimension. In the case of a small model bridge, a tiny bit of change in its rigidity and mass makes a big difference in its structural features. Normally a cable-stayed bridge is designed to have the load of the mid-part of its main span supported by the rigidity of cables, which thus absolutely determines its dynamic characteristics. So, an exact FE modelling is required, but there are some errors due to the limit of numerical analysis, which accordingly necessitates an experimental modal updating as a complement. This particular research aims to improve the structural integrity by the modal updating as a result of comparing two sets of different dynamic characteristics, one from a FE analysis, the other from an experiment. That improvement was evaluated by the MAC value which resulted from the analysis of the relationship between error possibilities in proper vibration and their modes both before and after modal updating. The evaluation proved that the modal updating was valid as a way to improve the structural integrity of a small model cable-stayed bridge..

트럭 실내 조명의 감성적 효과 확인을 위한 VR 환경의 타당성 검토

김태수(Taesu Kim),박민정(Minjung Park),오주원(Juwon Oh),김혜나(Heana Kim),임희천(Heecheon Lim),석현정(Hyeon-Jeong Suk) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5

실시간 Feedback 준능동 제어 시스템의 성능평가

허광희(Heo, Gwanghee),전준용(Jeon, Joonryong),김충길(Kim, Chunggil),오주원(Oh, Juwon) 한국구조물진단유지관리학회 2010 한국구조물진단학회 학술발표회논문집 Vol.2010 No.1

This paper is concerned with an experimental research to control of random vibration caused by external loads specially in cable-stayed bridges which tend to be structurally flexible. For the vibration control, we produced a model structure modelled on Seohae Grand Bridge, and we designed a shear type MR damper. Also, we inflicted a reduced form of El-centro wave on the model structure to a proper proportion. On the center of its middle span, we placed a shear type MR damper which was to control its vibration and also acquire its structural responses such as displacement and acceleration at the same site. The experiments concerning controlling vibration were performed according to a variety of theories including un-control, passive on/off control, clipped-optimal control, and Lyapunov stability theory. Its control performance was evaluated in terms of the peak absolute displacements, the peak absolute accelerations, and the total power required to control the bridge which differ from each different experiment method. Among all the methods applied in this paper, clipped-optimal control and Lyapunov control method turned out to be the most effective to reduces of displacements, accelerations, and external power. Finally, It is proven that the clipped-optimal control method and Lyapunov control method was effective and useful in the vibration control employing a semi-active devices such MR damper.

실시간 Feedback 준능동 제어 시스템의 성능평가

허광희 ( Heo Gwanghee ),전준용 ( Jeon Joonryong ),김충길 ( Kim Chunggil ),오주원 ( Oh Juwon ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1

This paper is concerned with an experimental research to control of random vibration caused by external loads specially in cable-stayed bridges which tend to be structurally flexible. For the vibration control, we produced a model structure modelled on Seohae Grand Bridge, and we designed a shear type MR damper. Also, we inflicted a reduced form of El-centro wave on the model structure to a proper proportion. On the center of its middle span, we placed a shear type MR damper which was to control its vibration and also acquire its structural responses such as displacement and acceleration at the same site. The experiments concerning controlling vibration were performed according to a variety of theories including un-control, passive on/off control, clipped-optimal control, and Lyapunov stability theory. Its control performance was evaluated in terms of the peak absolute displacements, the peak absolute accelerations, and the total power required to control the bridge which differ from each different experiment method. Among all the methods applied in this paper, clipped-optimal control and Lyapunov control method turned out to be the most effective to reduces of displacements, accelerations, and external power. Finally, It is proven that the clipped-optimal control method and Lyapunov control method was effective and useful in the vibration control employing a semi-active devices such MR damper.

무선시스템을 이용한 구조물 진동제어시스템 설계

허광희(Heo, Gwanghee),김충길(Kim, Chunggil),전준용(Jeon, Joonryong),오주원(Oh, Juwon),전승곤(Jeon, Seunggon) 한국구조물진단유지관리학회 2010 한국구조물진단학회 학술발표회논문집 Vol.2010 No.2

This paper aims to design a wireless control & communication system for the control of structural vibration and prove its functional effectiveness. This system is composed of a wireless measurement system acquiring the response of structure and a control system which analyzes the response signals of structure and thus controls the structural vibration. Essentially it as a central administration manages and controls the overall system. Also it wirelessly transmits data. In order to prove the effectiveness of the wireless control & communication system, the functions of analogy input and analogy output were verified. Especially the experiments for the test of analogy input and analogy output were performed ten times under each different condition. The comparison of the data from the experiments with those of a wired measurement system proved its outstanding effectiveness. It was thus found that the wireless control & communication system developed in this research would possibly control the vibration with the feedback signals after sending out proper output signals to the vibration control of structure.