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박수열(Soo-Yeol Park),원병연(Byung-Yeon Won),여금수(Keum-Soo Yeo),지창환(Chang-Hwan Ji),오영민(Young-Min Oh) 한국연안방재학회 2016 한국연안방재학회지 Vol.3 No.3
Light beacon structures are very essential to the maneuvering of ship especially in the night. The power is usually from the rechargeable battery connected to solar panel which generates electricity from the sunlight. There are two types of structures, one is floating and the other is fixed. In this study, we are dealing with the new power generation system motivated by the wave motion for the floating light beacon. The basic principle of new system is transforming wave motion into electricity by the solenoid that composed of circular tube coiled around and magnetic inside. We succeeded in generating electricity in the lab test using the motion actuator. On the basis of lab test experience it is applied to the real field, Samchuk port. The power unit is installed in the floating light buoy and generating electricity when the inclination of the buoy is beyond the certain limit. The amount of electricity depends on the wave height and wave period. The purpose of field test is to clarify the relationship between the wave condition and electricity.
김병화(Kim, Byeong-Hwa),여금수(Yeo, Keum-Soo),김수진(Kim, Soo-Jin) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.3
This study introduces a new technique to estimate modal parameters of a vibrating string using motion pictures. The approach requires two motion pictures for a vibrating string captured simultaneously by typical potable digital cameras or camcorders. Applying the space intersection theory and the space resection theory in photogrammetry, the steroscopic images for the string are constructed from two flat plane pictures. Then the three dimensional displacement components of the string are extracted by a multiple template matching technique. Finally the modal parameters of the string are estimated from the resulting displacement time histories. The accuracy of the approach has been examined through a small-scale mock-up of a string.
김병화 ( Kim Byeong Hwa ),김수진 ( Kim Soo Jin ),여금수 ( Yeo Keum Soo ),장정범 ( Jang Jung-bum ),이홍표 ( Lee Hong-pyo ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1
The changes in the dynamic properties of the prestressed concrete beams with grouted tendon have been experimentally investigated. Three prestressed concrete beams with different stress levels are considered. The various axial vibration tests are conducted. The changes in the axial responses of the beams with respect to the applied tensile force on the tendon has been examined. It seems that the axial vibration modes are a feasible indicator for the identification of tensile force of the grouted tendon.
김병화(Kim, Byeong Hwa),김수진(Kim, Soo Jin),여금수(Yeo, Keum Soo),장정범(Jang, Jung-Bum),이홍표(Lee, Hong-Pyo) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.1
The changes in the dynamic properties of the prestressed concrete beams with grouted tendon have been experimentally investigated. Three prestressed concrete beams with different stress levels are considered. The various axial vibration tests are conducted. The changes in the axial responses of the beams with respect to the applied tensile force on the tendon has been examined. It seems that the axial vibration modes are a feasible indicator for the identification of tensile force of the grouted tendon.
교량상판 슬래브의 동적응답을 이용한 영향선 추출 및 통행차량 축 하중의 인식
김병화(Kim, Byeong Hwa),김수진(Kim, Soo Jin),여금수(Yeo, Keum Soo),박민석(Park, Min Seok),박희구(Park, Heui Gu) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
Introducing a new algorithm to extract moment influence sequence from field data, a new identification algorithm for the axle loads of moving vehicles has been proposed. The proposed approach is based on an optimal linear filter design theory. The proposed algorithm makes use of the strain time histories of a bridge deck plate. The accuracy and practicability of the algorithm have been examined experimentally for a folded deck plate on Yongjong Grand suspension bridge. It turns out that the algorithms are feasible and economical while some further works for the accuracy improvement are expected.
교량상판 슬래브의 동적응답을 이용한 영향선 추출 및 통행차량 축 하중의 인식
김병화 ( Kim Byeong Hwa ),김수진 ( Kim Soo Jin ),여금수 ( Yeo Keum Soo ),박민석 ( Park Min Seok ),박희구 ( Park Heui Gu ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
Introducing a new algorithm to extract moment influence sequence from field data, a new identification algorithm for the axle loads of moving vehicles has been proposed. The proposed approach is based on an optimal linear filter design theory. The proposed algorithm makes use of the strain time histories of a bridge deck plate. The accuracy and practicability of the algorithm have been examined experimentally for a folded deck plate on Yongjong Grand suspension bridge. It turns out that the algorithms are feasible and economical while some further works for the accuracy improvement are expected.
프리스트레스 콘크리트 보의 긴장력과 종진동특성 사이의 관계
김병화(Kim, Byeong Hwa),김수진(Kim, Soo Jin),여금수(Yeo, Keum Soo),장정범,이홍표,Park, Min Seok,Park, Heui Gu 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
This study investigates the experimental relationship between applied prestress force level and dynamic property of a bonded prestressed concrete beam. Total six prestressed concrete beams with different stress levels have been constructed for this investigation. The various axial vibration tests have been conducted to extract dynamic characteristics of the prestressed concrete beams. It turns out that the axial frequency, elastic wave velocity and elastic modulus nonlinearly increase as the prestress force level increases.
프리스트레스 콘크리트 보의 긴장력과 종진동특성 사이의 관계
김병화 ( Kim Byeong Hwa ),김수진 ( Kim Soo Jin ),여금수 ( Yeo Keum Soo ),장정범 ( Park Min Seok ),이홍표 ( Park Heui Gu ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
This study investigates the experimental relationship between applied prestress force level and dynamic property of a bonded prestressed concrete beam. Total six prestressed concrete beams with different stress levels have been constructed for this investigation. The various axial vibration tests have been conducted to extract dynamic characteristics of the prestressed concrete beams. It turns out that the axial frequency, elastic wave velocity and elastic modulus nonlinearly increase as the prestress force level increases.