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철도교량 단부 콘크리트 궤도 사용성 검토 비선형 해석법에 대한 소고
장성규 ( Chang Seong Kyu ),이창주 ( Lee Chang Ju ),성덕룡 ( Sung Deok Yong ),이성우 ( Lee Sung Woo ),김두기 ( Kim Doo Kie ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.1
In this study, a nonlinear analysis method was proposed to investigate serviceability of rail fastening system in concrete track at the railway bridge end. The serviceability investigation method of the fastening system in concrete track is time consuming and is complex in design because of the many decks and fastening systems. In addition, there is also a case where an expensive special fastening device is installed due to the stiffness of the rail fastening device assumed to be linear and the excessive design result by the linear analysis method. Therefore, in this study, the clamping force test was performed to confirm the nonlinearity of fastener. The conventional linear analysis method and the proposed nonlinear analysis method were performed for the railway bridge model specimen with concrete tracks, and the uplift forces acting on the fastening systems were compared and analyzed.
김동현(Kim, Dong-Hyawn),장성규(Chang, Seong-Kyu),권순덕(Kwon, Soon-Duck),김두기(Kim, Doo-Kie) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.7
A new neuro-control scheme for active control of structures is proposed. It utilizes lattice pattern of state vector as training data of probabilistic neural network(PNN). Therefore. it is the so-called lattice probabilistic neural network(LPNN). PNN makes control forces by using all the training patterns. Therefore, it takes much time to obtain a control force in application. This inevitably may delay the control action. However. control force of LPNN is calculated by using only the adjacent information of LPNN input. So, the response of LPNN is greatly faster than PNN. The proposed control algorithm is applied for three story building under California and El Centro earthquakes. Also, control results of the LPNN are compared with those of the conventional PNN. The structural responses have been suppressed effectively by the proposed algorithm.
구엔반동 ( Nguyenvan Dong ),이창주 ( Lee Chang Ju ),백건휘 ( Baek Geon Hwi ),장성규 ( Chang Seong Kyu ),김두기 ( Kim Doo Kie ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.1
The mechanical behavior of the fasting system on the clamping forces has not been fully studied because of structural complexity. The goal of this research is studying the effect of nonlinear of the rail fastening system on the clamping forces in the railway bridges. A numerical model is proposed to analyze the problem of fasteners. The model is conducted by using a code in FORTRAN. In this study, fasteners are modelled as springs. The calculated results show a good agreement with values referred from manufacturer. As a result, the numerical simulation is believed to indicate an approximate value of clamping force considering the nonlinear behavior of fastening system.
김두기(DOO-KIE KIM),김동현(DONG-HYAWN KIM),장성규(SEONG-KYU CHANG),장상길(SANG-KIL CHANG) 한국해양공학회 2006 韓國海洋工學會誌 Vol.20 No.5
A Probabilistic neural network (PNN) technique for predicting the stability number for the armor blocks of breakwaters is presented. A PNN is prepared using the experimental data of van der Meer and is then compared with the empirical formula and previous artificial neural network (ANN) model. This comparison shows that a PNN can effectively predict the stability numbers in spite of data complexity, incompleteness, and incoherence, and can be an effective tool for the designers of rubble mound breakwaters to support their decision process and to improve design efficiency.
PVK:Ir(ppy)₃ 발광부를 갖는 고분자 인광 발광다이오드의 특성평가
백승준(Baek, Seung-Jun),공수철(Gong Su-cheol),이호섭(Lee, Ho-Sub),장성규(Jang, Seong-Kyu),장호정(Chang Ho Jung) 한국산학기술학회 2010 한국산학기술학회 학술대회 Vol.- No.-
고분자 발광다이오드(polymer light emitting diode, PLED)는 초박막화, 초경량화가 가능하며 간단한 용액공정 으로 향후 휨성(flexible) 디스플레이로의 응용이 가능할 것으로 기대되고 있다. 본 연구에서는 녹색 고분자 유기 발광다이오드를 제작하고, 효율을 향상 시키고자 이중 발광층을 두어 전기·광학적 특성을 평가하였다. ITO/Glass기판 위에 정공주입층으로 PEDOT:PSS [poly(3,4-ethylenedioxythiophene):poly(styrene sulfolnate)]를 발광물질로는 형광 발광물질인 PVK(poly-vinylcarbazole)와 인광 발광 물질인 Ir(ppy)3[tris(2-phenylpyridine) iridium(III)]를 각각 host와 dopant로 사용하였다. 정공 차단층 및 전자 수송층 두 개의 역할로 사용 가능한 TPBI(1,3,5-tris(2-N-phenylbenzimidazolyl) benzene)를 진공 열증착법으로 막을 형성하였다. 전자주입층으로 LiF(lithium flouride)와 음극으로 Al(aluminum)을 증착하여 최종적으로 ITO/PEDOT:PSS/PVK:Ir(ppy)3/TPBI/LiF/Al 구조를 갖는 녹색 형광:인광 혼합 유기 발광 다이오드를 제작하였다.