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철골조 고층건물의 하프파워법과 RD법에 의한 감쇠율 비교
윤성원,주영규,신상준,Yoon, Sung-Won,Ju, Young Kyu,Shin, Sang Jun 한국강구조학회 2007 한국강구조학회 논문집 Vol.19 No.1
본 논문에서는 상시진동계측에서 얻은 시계열파형에서 하프파워법과 RD법을 통하여 감쇠율을 산정하여 해석법에 따른 감쇠율의 변동성을 분석하였다. 상시진동계측은 국내 철골조 건물 2개동과 철골철근콘크리트조 건물 1개동을 대상으로 실시하였다. 하프파워법(half- power bandwidth method)의 변수는 앙상블 데이터수를 1024, 2048, 4096, 8192로 변화시키면서 감쇠율의 변화 경향을 분석하여 하프파워법의 적용성을 검토하였다. 상시진동계측 데이터에서 앙상블의 데이터 사이즈를 1024 에서 8192로 증가함에 따라서 하프파워법에 의한 감쇠율은 감소하면서 일정한 값으로 수렴하면서 RD법에 의한 감쇠율과 비슷해짐을 확인하였다. 또한 하프파워법에 대한 감쇠율은 일반적으로 RD법에 의한 감쇠율보다 다소 큰 것을 확인하였다. In this paper, the damping ratios of two methods, namely the half-power bandwidth method and random decrement method from the vibration measurement were examined. Ambient vibration tests were conducted on two steel-framed and one composite tall building ranging from 27 to 36 stories. The performance of the half-power bandwidth method was investigated using four sample sizes, such as 1024, 2048, 4096 and 8192. Damping by the half-power bandwidth method is slightly more overestimated than the random decrement method due to insufficient record length. Damping evaluation by the half-power bandwidth method was found to be enhanced when using the narrower bandwidth with long recorded data.
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국부 및 혼합 Lagrange 승수법을 이용한 영역분할 기반 유한요소 구조해석 기법 개발
곽준영,조해성,신상준,올리비에 보쇼,Kwak, Jun Young,Cho, Hae Seong,Shin, Sang Joon,Bauchau, Olivier A. 한국전산구조공학회 2012 한국전산구조공학회논문집 Vol.25 No.6
In this paper, a finite element domain decomposition method using local and mixed Lagrange multipliers for a large scal structural analysis is presented. The proposed algorithms use local and mixed Lagrange multipliers to improve computational efficiency. In the original FETI method, classical Lagrange multiplier technique was used. In the dual-primal FETI method, the interface nodes are used at the corner nodes of each sub-domain. On the other hand, the proposed FETI-local analysis adopts localized Lagrange multipliers and the proposed FETI-mixed analysis uses both global and local Lagrange multipliers. The numerical analysis results by the proposed algorithms are compared with those obtained by dual-primal FETI method.
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일반한식업의 사회공헌활동 영향요인과 구매의도에 관한 연구
양정영 ( Yang Jeong Yeong ),신상준 ( Sang Jun Shin ) 대한관광경영학회 2014 관광연구 Vol.29 No.5
The purpose of this study is to provide implications for planning and application of corporate social responsibility in Korean style restaurant. The results of the analysis of the causal relationship between cause-company fit, cause-involvement, CSR(corporate social responsibility: cause-related marketing, philanthropy activities) attitude, corporate attitude, purchase intention are as follows:First, it is presented that cause-company fit has a positive impact on CSR attitude(CRM and PA) and cause-involvement has a positive impact on PA attitude. Second, CSR attitude has a positive impact on corporate attitude. Finally, corporate attitude has a positive impact on purchase intention. Based on the results of the above analysis, implications for planning and application of corporate social responsibility are as follows:First, because the high cause-company fit has a positive impact on CSR attitude, it is necessary to plan the CSR activities of the high cause-company fit. Second, to increase the cause-involvement, the effort to appeal to customer on the needs and meaningfulness of the CSR activities is needed. Finally, because CSR activities have a positive impact on corporate attitudes, and purchase, it is necessary to utilize CSR activities as the PA strategies and CRM tactics for the continuous competitiveness in Korean style restaurant.
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유영국(Young-Kuk You),신상준(Sang-Jun Shin),박영성(Yeong-Seong Park) 대전대학교 환경문제연구소 2013 환경문제연구소 논문집 Vol.17 No.-
H2S adsorption characteristics of adsorbent made by fallen leaves were investigated. For analyses of the manufactured adsorbent, various methods such as scanning electron microscope(SEM) and measurements of BET surface area were adopted. As major adsorption characteristics, adsorption equilibrium capacity was measured by using a batch type experimental apparatus for operating variables such as adsorption temperature(25~45℃) and adsorbent types. The experimental result showed that the H2S adsorption equilibrium capacity of adsorbent made by fallen leaves decreased with increasing adsorption temperature due to physical adsorption phenomena. It was also found that the H2S adsorption capacity of the adsorbent increased remarkably by an acid treatment with HCl solution.
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강현구(Hyeon-koo Kang),신상준(Sang-jun Shin) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
Center joint acts as a transporter to supply the oil from the upper body to the lower track driving motor in the construction machineries. Regardless of a turning operation of the upper body, the oil of upper has to be supplied to the hydraulic components in lower body. During the transporting the oil pressure drop should be minimized. In this study we calculated the oil pressure and pressure drop according to the flow channel shapes. The results show the similar values to the experimental results of the former research. And this results can be used the design of flow channel shape in the center joint.
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박은숙 ( Eun Sook Park ),김성구 ( Sung Koo Kim ),신선희 ( Seon Hee Shin ),윤혜선 ( Hae Sun Yoon ),신상준 ( Sang Jun Shin ) 대한소아알레르기호흡기학회 2002 Allergy Asthma & Respiratory Disease Vol.12 No.4
Pulmonary sequestration is a rare congenital mass of nonfunctional pulmonary tissue that lacks of a normal connection with the bronchial tree or pulmonary artery. It may be clinically asymptomatic but may be complicated by recurrent infection. The classic
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OoA (Out-of-Autoclave) 프리프레그를 이용한 항공기용 복합재 일체형 부품 제작 및 평가
홍성진 ( Sungjin Hong ),송민환 ( Min-hwan Song ),송근일 ( Keunil Song ),백상문 ( Sang-moon Baik ),신상준 ( Sang-jun Shin ) 한국복합재료학회 2016 Composites research Vol.29 No.5
Conventionally, composite aircraft structures are fabricated within autoclave at high pressure. However, autoclave process has several disadvantages including high curing costs and limitation of part size. Recently, out-ofautoclave (OoA) processes have been investigated in many studies to replace conventional autoclave process. A newly developed OoA prepreg, using conventional ovens, can significantly reduce the curing costs and produce autoclavequality parts. Nevertheless, manufacture of void-free complex shape structure using OoA process presents significant challenges because of the low consolidation pressure. In this study, integrated skin-spar-rib composite part was fabricated using OoA prepreg. And cross-sectional macro- and micro-graphs of the part were examined in order to assess the possibility of replacing conventional autoclave process.
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샌드위치와 적층판을 접착한 단일겹침 체결부의 고온습도 강도특성 연구
최배현(Bae-Hyun Choi),권진회(Jin-Hwe Kweon),최진호(Jin-Ho Choi),신상준(Sang-Jun Shin),송민환(Min-Hwan Song) 한국항공우주학회 2010 한국항공우주학회지 Vol.38 No.11
본 논문에서는 샌드위치-적층판 단일겹침 접착 조인트의 정적강도를 시험을 통해 연구하였다. 접착제의 두께(3종류 : 0.2, 2, 4 ㎜)와 환경조건(2가지 : 상온, 고온흡습)을 변화시키면서 총 38개의 시편을 제작하여 시험을 수행하였다. 시험 결과, 접착제의 두께가 0.2㎜에서 2 ㎜ 와 4 ㎜로 증가함에 따라 체결부의 파손강도가 각각 16% 와 30% 정도 감소하는 것으로 나타났다. 반면 고온흡습 환경에서의 파손강도는, 접착제의 두께가 0.2 ㎜인 경우를 제외하면, 접착제의 열화현상이 적층판과 샌드위치 면재의 층간분리 혹은 층내분리 파손을 지연시켜, 상온건조 환경에 비해 약 12% 가량 높게 나타났다. 접착제의 두께가 얇은 0.2 ㎜의 경우 시험환경의 효과는 나타나지 않았다. The main objective of this study is to experimentally investigate the effect of adhesive thickness and environmental conditions on the failure and strength of sandwich-to-laminate bonded joints. Three different adhesive thicknesses (t=0.2, 2 and 4 ㎜) and two different environmental conditions were considered. Environmental conditions include the RTD(room temperature and dry condition) and ETW(elevated temperature and wet condition). Test results show as the adhesive thickness increases from 0.2 ㎜ to 2 and 4 ㎜, the joint strength decreases 16 and 30%, respectively. Regarding the effect of environmental conditions, except for one case, the joint strength in the ETW conditions turned out to be 12% higher than those in the RTD conditions. In the joints with adhesive thickness of 0.2 ㎜, remarkable difference from RTD condition was not found.
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