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金錫中 강원대학교 산업기술연구소 1984 産業技術硏究 Vol.4 No.-
Buckling is a significant behavior to be considered whenever we design steel structures. In the case of H-shape beams, the lateral buckling occured by bending moment must be considered, Because of the lateral buckling of H-shape beams, the bending strength of the beams are determined by the lateral buckling stress instead of the allowable bending stress. lateral buckling stress equation, consisting of two terms, i. e. ***** , has been using, but for the practical purpose of use the following equations are using two, i. e. ***** . When we use the above equations, the results are different according to the shape of beam section, and they are rather complex. In this study lateral buckling stress equation is derived, and the proposed formula ***** is compared with above mentioned two basic and practical equations. To verify the proposed formula experimentaly, 16 H-shape beams which have different slender ratios are tested by applying pure bending momet. Through the experiments the buckling behavior of H-shape beams is clarified, and the results shows that the proposed formula ***** is accurate enough for practcal purpose.
우유의 소비행태 변화에 관한 연구 : 의사결정나무분석기법을 이용하여
김석중,신인자,이병오 한국농업정책학회, 한국축산경영학회 2000 농업경영정책연구 Vol.27 No.1
Milk consumption pattern was analyzed using the decision tree method, one of the data mining techniques. Raw data of annual report on the family income and expenditure survey performed by National Statistical Office in 1988 and 1998 were used for analysis. The results showed that the milk consumption pattern was affected by an economical factor in 1988, but by social factors in 1998.
金錫中 江原大學校 産業科學硏究所 1981 産業技術硏究 Vol.1 No.-
In the steel Structural design, buckling is the main factor to determine size, particularly in compression member. Buckling may sometimes occur in the form of wrinkles in thin elements, such as webs, flanges, and other parts that make up a section. This phenomenon is called local buckling. The strength of the steel and the rigidity of the frame are considerably deteriorated by the local buckling. The specimens used for this experiments, H-Shape Steel beams composed by filletwelding, are dessified classified into two groups, ie one for web test and another for flange fest. The aim of this study is to define the influences by the local bucking on the vesisting forces, deformation and the phenomena of the internal forces in the section, and to collect the basic data for design of steel beams.
김석중,박재현,김명모 한국지반공학회 2014 한국지반공학회논문집 Vol.30 No.11
Load and Resistance Factor Design (LRFD) is one of the limit state design methods, and has been used worldwide,especially in North America. Also, the study for LRFD has been actively conducted in Korea. However, the data forLRFD in Korea were not sufficient, so resistance factors suggested by AASTTO have been used for the design in Korea. But the resistance factors suggested by AASHTO represent the characteristics of bedrocks defined in the US, therefore,it is necessary to determine the resistance factors for designs in Korea, which can reflect the characteristics of bedrocksin Korea. Also, the calculated probabilities of failure from conventional reliability analyses which commonly uselog-normal distribution are not realistic because of the lower tail that can be extended to zero. Therefore, it is necessaryto calibrate the resistance factors considering the lower-bound resistance. Thus, this study calculates the resistance factorsusing thirteen sets of drilled shaft load test results, and then calibrates the resistance factors considering the lower-boundresistance corresponding to a target reliability index of 3.0. As a result, resistance factors from conventional reliabilityanalyses were determined in the range of 0.13-0.32 for the shaft resistance, and 0.19-0.29 for the base resistance,respectively. Also, the lower bounds of resistance were determined based on the Hoek-Brown failure criteria (2002)and GSI downgrading. Considering the lower-bound resistances, resistance factors increased by 0~8% for the shaft,and 0~13% for the base, respectively.