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송진규 ( Song Jin Gyu ),윤정배 ( Yoon Jeong Bae ),이철호 ( Lee Chul Ho ),최정욱 ( Choi Jung Wok ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
Using reinforced concrete intermediate moment-resisting frames(RC IMRFs), an analytical procedure is presented in this paper to establish R factor rationally. To this end, analytical R values were evaluated based on N2 Method and compared with the values recommended by IBC 2000. Overall, the analytical results correlated well with the code values. However the results also revealed that R factor might strongly depend on the system fundamental period.
박성봉 ( Park Sung-bong ),윤정배 ( Yoon Jeong-bae ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.1
The purpose of this study is to estimate the permeability coefficient of concrete using mass hydrophobation agent. Experiments were carried out by making concrete specimens with different amounts of mass hydrophobation agent. It is considered that the pores are filled in the internal structure of the concrete by the expansion of the mass hydrophobation agent.
N2 Method를 이용한 RC IMRFs의 내진성능 평가
송진규 ( Song Jin Gyu ),윤정배 ( Yoon Jeong Bae ),이철호 ( Lee Chul Ho ),최정욱 ( Choi Jung Wok ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
Code based earthquake resistance design approach has some major shortcomings linked to the current R factor though it has a conceptual background for safety. As evidenced by the interstory drift index(IDI) analysis results of this study for IMRFs, current R-factor based (or, Life Safety based) design tends to fail in fulfilling other implicit and hopeful performance objectives such as Immediate Occupancy and Collapse Prevention. Performance based design(PBD) appears to be a promising approach to meet the multi level seismic performance objectives assigned to the building structures of nowadays.
최정욱(Choi Jung-Wook),윤정배(Yoon Jeong-Bae),송진규(Song Jin-Gyu) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.6
Cracking of slabs would be caused by applied loads and volume changes during the life of a structure. And it reduces flexural stiffness of slabs and increases lateral flexibility. Thus, a stiffness reduction phenomenon due to slab cracking must be considered in stiffness assumptions for lateral drift calculations. A combined analytical and experimental study about the stiffness reduction factor of slabs in a flat plate structure is conducted. In analytical study, the stiffness reduction factor is changed by the magnitude of gravity loads and column spans, but its variation is much reduced by lateral loads. The stiffness reduction factor for combined loads ranges from a half to a quarter. This range matches the commentary specified in ACI 318-02. A test of nine-connection flat plate frames constructed at fifty percent of full scale is undertaken. This test provides data on lateral response at the service gravity load level. Based on a 0.2 percent drift criterion for building serviceability and a 0.5 percent drift criterion for story safety, the comparisons between test results and analysis results using the effective beam width model are performed. The experimental study shows that the stiffness reduction of the interior connection is much smaller than the stiffness reduction of the other connections, and the effective beam width model with a constant stiffness reduction factor of one-third gives a close stiffness estimate for the test structure.
빔 스위칭을 이용한 24 GHz 장거리 탐지용 레이다 송신기
이재은(Jae-Eun Lee),윤정배(Jeong-Bae Yoon),김동휘(Dong-Hwi Kim),송림(Reen Song),김병성(Byung-Sung Kim) 한국전자파학회 2021 한국전자파학회논문지 Vol.32 No.10
본 논문은 3차원 장거리 탐지용 24 GHz FMCW(frequency modulated continuous wave) 레이다 구현을 위한 송신기를 제안한다. 제안하는 송신기는 높은 EIRP(effective isotropic radiation power)와 고각 정보를 획득하기 위해 수직 ±15° 사이에 7개의 스위칭 팬빔을 구현한다. 손실이 크고 출력이 제한되는 전자 스위치와 부피가 큰 수동 빔포밍 회로망 대신 각 지향 각도별로 안테나를 설계하고, 각 안테나를 7개의 전력증폭기로 직접 스위칭 구동하여 빔포밍 송신기를 구현하였다. 빔당 EIRP는 48.676 dBm 내외이며, 제작된 송신기 모듈의 크기는 27.5cm×11cm이다. This paper proposes a three-dimensional 24 GHz frequency modulated continuous-wave (FMCW) radar transmitter for long-range detection. The proposed transmitter implements seven switched vertical fan beams from 15° to −15° for high effective isotropic radiated power (EIRP) and vertical angle detection. Instead of using lossy electronic switches and large passive beamforming networks, the beamforming transmitter is achieved by directly switching the power amplifier, which drives a sectoral series patch array antenna. The EIRP of each beam is approximately 48.676 dBm, and the size of the transmitter is 27.5 cm × 11 cm.