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최형석,전법규,김남식,정진환 釜山大學校生産技術硏究所 2007 生産技術硏究所論文集 Vol.66 No.-
건물에 작용하는 진동하중은 구조물 자체의 성능에 영향을 미칠 뿐만 아니라 거주하는 사람이나 작업기계 동에 나쁜 영향을 가져올 수 있다. 본 연구에서는 이러한 진동에 대한 영향을 평가하는 국내외의 기준에 대하여 고찰하고 다양한 하중과 주파수 대역에서 실험이 가능한 대형지진모사 실험센터에 대한 진동영향 평가를 수행하여 사용성 저하 여부를 확인하였다.
Zygosaccharomyces rouxii OB-03과 Pediococcus halophilus BH-90 의 첨가에 의한 低食鹽된장의 개발
류병호,채영주,박법규,김동규 慶星大學校 1991 論文集 Vol.12 No.2
For the deveolpment of new technique for low salty soybean paste, this study were carried out to the large scale fermentation of soybean paste after the addition of number of mass cells of Zygosaccharomyces rouxii OB-03 and Pediococcus halophilus BH-90. Inoclum size of Z. rouxii )B-03과 P. halophilus BH-90 was adapted to the rate of 1.8*10??/ml and 1.8*10⁴/ml in large scale fermentation of soybean paste. pH and lactic acid content were not markedly changed and, total and formol nitrogen was eluted high levels in 4% and 8% NaCl concentration during fermentation of soybean paste. Z. rouxii B-03 and P. halophilus BH-90 grew well at 4% NaCl than that of 8% and 12% NaCl concentrations and ethylalcohol also produced highest level at 4% NaCl. Glutamic acid and aspartic acid of free amino acid were eluted prodiminantly at 4% NaCl acid and also lactic were high content then that of others.
진동대실험을 통한 원추형 마찰진자베어링의 내진성능 평가
전법규(Bub-Gyu Jeon),장성진(Sung-Jin Chang),김남식(Nam-Sik Kim) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.4
Existing FPS(Friction Pendulum System) is isolation system which is possible to isolate structures by pendulum characteristic from ground vibration. Structural natural frequency could be decided by designing the radius of curvature of FPS. Thus, response vibration could be reduced by changing natural frequency of structures from FPS. But effective periods of recorded seismic wave were various and estimation of earthquake characteristic could be difficult. If effective periods of seismic wave correspond to natural frequency of structures with FPS, resonance can be occurred. Therefore, CFPBS(Cone-type Friction Pendulum Bearing System) was developed for controlling the response acceleration and displacement by the slope of friction surfaces. Structural natural frequency with CFPBS can be changed according to position of ball on the friction surface which was designed cone-type. Therefore, Divergence of response could be controlled by CFPBS which had constantly changing natural frequency with low modal participation factor in wide-range. In this study, Seismic performance of CFPBS was evaluated by numerical analysis and shaking table test.
Jeon, Bub-Gyu,Son, Ho-Young,Eem, Seung-Hyun,Choi, In-Kil,Ju, Bu-Seog Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.7
Seismic qualifications of electrical equipment, such as cabinet systems, have been emerging as the key area of nuclear power plants in Korea since the 2016 Gyeongju earthquake, including the high-frequency domain. In addition, electrical equipment was sensitive to the high-frequency ground motions during the past earthquake. Therefore, this paper presents the rocking behavior of the electrical cabinet system subjected to Reg. 1.60 and UHS. The high fidelity finite element (FE) model of the cabinet related to the shaking table test data was developed. In particular, the first two global modes of the cabinet from the experimental test were 16 Hz and 24 Hz, respectively. In addition, 30.05 Hz and 37.5 Hz were determined to be the first two local modes in the cabinet. The high fidelity FE model of the cabinet using the ABAQUS platform was extremely reconciled with shaking table tests. As a result, the dynamic properties of the cabinet were sensitive to electrical instruments, such as relays and switchboards, during the shaking table test. In addition, the amplification with respect to the vibration transfer function of the cabinet was observed on the third floor in the cabinet due to localized impact corresponding to the rocking phenomenon of the cabinet under Reg.1.60 and UHS. Overall, the rocking of the cabinet system can be caused by the low-frequency oscillations and higher peak horizontal acceleration.