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공업용 플라스틱으로 보강된 비좌굴가새의 실험적 구조성능평가
김유성,김기철,강주원,이준호,Kim, Yu-Seong,Kim, Gee-Chul,Kang, Joo-Won,Lee, Joon-Ho 한국공간구조학회 2020 한국공간구조학회지 Vol.20 No.3
In this study, the Buckling restrained braces reinforced with engineering plastics that can compensate for the disadvantages in the manufacturing process of the existing buckling restrained brace. The proposed PC-BRB was fabricated to evaluate the reinforcement effect by carrying out a structural performance test and a full-scale two-layer frame test through cyclic loading test. As a result of PC-BRB's incremental and cyclic loading test, stable hysteresis behavior was achieved within the target displacement, and the compressive strength adjustment coefficient satisfied the recommendation. As a result of the real frame experiment, the strength of the reinforced specimen increased compared to the unreinforced specimen, and the ductility and energy dissipation increased.
김유성,유인환,Kim, Yu-Song,Yoo, In-Hwan 한국정보교육학회 2006 정보교육학회논문지 Vol.10 No.1
Students should be able to find information and resources using the Internet. Also students need to have composite intellectual abilities to select information, convert to knowledge and communicate it to other people. However, most school and classroom homepages provide students with information but not contents that help them produce knowledge. This lowers the rate of connection to homepage. Thus, the purpose of this study is to develop and apply homepage, which helps students make knowledge from comprehended and interpreted information(Knowledge.Sharing Technique; KST). In this study we use 'WIKI KST' and 'Q&A KST' to share knowledge. WIKI KST is 'an encyclopedia that we make,' which means that students upload their prior knowledge or knowledge produced from comprehended and interpreted information and create new knowledge to be added to their own knowledge and others'. As a result, the abilities to comprehend and interpret acquired information are improved and the ability to change implicit knowledge to explicit knowledge is also improved. Students create new knowledge to share their knowledge and, as a result, the rate to connection to homepage gets higher.
A TECHNIQUE TO OPTICALLY DETERMINE THE STOICHIOMETRY OF $C_2$ GROWN LITHIUM NIOBATE CRYSTALS
김유성,Kim, You-Song The Korea Association of Crystal Growth 1991 韓國結晶成長學會誌 Vol.1 No.2
비균질 용융을(incongruent melting behavior)보이는 단결정제조에 있어 화학성분을 일정성분비로 유지하는 것은 매우 어렵다. $LiNbO_3$는 이러한 성질을 보이는 대표적인 예인데 넓은 고용(固溶)영역에서 일정성분비를 유지하기 힘들다 . 정밀전기/ 광학장치에 있어 이런 변수는 치명적이라 할 수 있다. 결정의 조성과 질을 결정하는 방법으로 굴절율(n)을 측정하는 광학적 방법이 수행되어 왔다. 이 방법으로 성장결정의 광학적 균질성과 화학조성을 알아낼 수 있다. 여기서는 그런 특성분석에 사용 되는 기술을 설명하고 그 결과들을 제시해 보았다 In growing single crystals, which exhibit incongruent melting behavor, it is extremely difficult to maintain the stoichiometry of its chemical compositions for given crystals. For instance, $LiNbO_3$ is a typical one which exhibits such incongruent melt, especially with a large solid solution region that makes it difficult to maintain the chemical compositions. Such a variation can then cause a serious problem for the practical applications in designing a precision electro /optic device. Of the known methods of determining its composition and quality, an optical technique of measuring refractive index of the crystals has been implemented. This technique is also capable of determining optical uniformity of the grown crystals and the chemical compositions. The technique used for such characterizations is herein described and some of results are discussed.
구조물의 회복탄력성 기반 성능평가법에 대한 고찰 및 적용 방안에 관한 연구
김유성,강주원,이준호,Kim, Yu-Seong,Kang, Joo-Won,Lee, Joon-Ho 한국공간구조학회 2020 한국공간구조학회지 Vol.20 No.4
The resilience performance evaluation method of a structure can evaluate the ability to recover after an earthquake disaster, and this study deals with the consideration and introduction of the resilience performance evaluation method. The resilience evaluation method can be expressed as a quantified number by constructing a loss estimation model and a recovery evaluation model. The recovery evaluation model should consider downtime in addition to the repair time, and the loss estimation model should consider not only direct loss to structures and non-structures, but also indirect loss due to functional loss of the building. In addition, to build a loss estimation model, the structure should be simplified to perform an efficient analysis. Therefore, in this study, the equivalent terminal induction system proposed cantilever-type and rahmen-type SDOF, and it is evaluated somewhat conservatively compared to the example structure, and it is judged that there is a need to improve the hysteresis characteristics by applying the stiffness reduction factor of the SDOF model.
공업용 플라스틱의 선조립형 비좌굴가새로 보강한 건축물의 내진 성능 평가
김유성,박병태,이준호,Kim, Yu-Seong,Park, Byung-Tae,Lee, Joon-Ho 한국공간구조학회 2021 한국공간구조학회지 Vol.21 No.4
The precast-buckling restrained braces(PC-BRB) reinforced with engineering plastics that can compensate for the disadvantages in the manufacturing process of the existing buckling restrained brace. In this study, to examine the applicability of PC-BRB to actual structures, example structures similar to school facilities were selected and the reinforcement effect was analyzed analytically according to the damping design procedure of PC-BRB. Load-displacement curve through the incremental loading test appeared similar to the bilinear curve. Applying test result, Analytical model of PC-BRB model was constructed and applied to the example structure. As a result of the analysis, the PC-BRB showed stable hysteresis behavior without lowering the strength, and the inter story drift ratio and the shear force were reduced due to the damping effect. In addition, the reduction ratio of the shear force was similar to the reduction ratio assumed when designing the damping device.
김유성,고태금,김용석,Kim Yoo-Seong,Koh Tae-Gum,Kim Yong-Seog 한국분말야금학회 2006 한국분말재료학회지 (KPMI) Vol.13 No.3
In an attempt to reduce processing cost and to improve resolution of PDPs, micro mold transfer processing route for barrier ribs of plasma display panel was attempted. In this study, the parameters that may cause defects during the process were identified, which include the shrinkage during UV curing process, stress due to evaporation of organic components, and sintering shrinkage. Considering such parameters, UV curable paste was developed and barrier ribs of PDPs were successfully processed via the process. This work demonstrated the possibility of build-up route in manufacturing barrier ribs of PDP.
틸트로터 항공기의 탑재장비 상세 지지구조 형상을 고려한 전산진동해석 및 평가
김유성 ( Yu Sung Kim ),김동현 ( Dong Hyun Kim ),김동만 ( Dong Man Kim ),양건명 ( Jian Ming Yang ),이정진 ( Jung Jin Lee ) 한국항공운항학회 2007 한국항공운항학회지 Vol.15 No.4
In this study, computational structural vibration analyses of a smart unmanned aerial vehicle (SUAV) with tilt-rotors due to dynamic hub loads have been conducted considering detailed supporting structures of installed equipments. Three-dimensional dynamic finite element model has been constructed for different fuel conditions and tilting angles corresponding to helicopter, transition and airplane flight modes. Practical computational procedure for modal transient response analysis is successfully established. Also, dynamic loads generated by rotating blades and wakes in the transient and forward flight conditions are calculated by unsteady computational fluid dynamics technique with sliding mesh concept. As the results of present study, transient structural displacements and accelerations of the vibration sensitive equipments are presented in detail. In addition, vibration characteristics of structures and installed equipments of which safe operation is normally limited by the vibration environment specifications are physically investigated for different flight conditions.