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최문식,김보영 단국대학교 2000 論文集 Vol.35 No.-
To study on the shear lag effect in the block shear rupture of joints under tension force, in this report analyzed the research results on block shear rupture of H-shape. CT-shape and L-shape. When computing the block shear internal force in the joints under tension force, by comparing the block shear equations of the Limited State Design criteria. AISC(which do not include the shear lag) with Epstein's equations(which do), the results on the propriety of shear lag reduction coefficient are as follows. 1) Block shear equations of the LRFD(1993) of the AISC do not include the shear lag in the joints under tension force. In the study results, the professional factors of H-shape, CT-shape and L-shape are 1.07, 0.96 and 0.97. Therefore the results show that the block shear equations of the LRFD(1993) of the AISC are not appropriate. 2) In the LRFD(1993) of the AISC and the Limited State Design criteria, when real block shear rupture length and the smaller value of the two reduction coefficient are applied, CT-shape's and L-shape's professional factor is 1.04 and H-shape's is 1.17. Therefore, applying the reduction coefficient to the block shear equation under tension force is quite appropriate for the CT-shape and L-shape. For the H-shape, the results show that a little excessive but safe. 3) In the Adidam and Epstein's equation(1992), when real block shear rupture length and the larger value of the two reduction coefficient are applied, CT-shape's professional factor is 0.98, L-shape's is 1.03, and H-shape's is 1.07. Therefore, it is thought that applying the reduction coefficient is necessary in the block shear equation under tension force and it should be corrected when applying the U factor. 4) From the above results, when computing the block shear internal force, it is thought that reduction coefficient for the shear lag should be considered.
인장력을 받는 CT형강 고력볼트 접합부의 감소계수 U값에 관한 연구
윤성호,김진숙,김원식,신영록,김보영,최문식 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
The purpose of this experimental study is to investigate the validity of code equation and table to calculate the reduction coefficient for effective net area in the limit state design code of steel structure and offer the basic research data for the effective net area of tee shape members in tension. The experimental tests were performed by loading the specimens through the flange with high strength bolt. Length of connection, number of bolt and the eccentricity are the parameters in test. According to result, the failure loads in test is less than predicted loads and it well showed when the predicted loads are based on reduction coefficient of the table in code. The lateral buckling of stem occurred in the members with big eccentricity and it reduce the failure loads. Therefore, we thought that an additional tests and research on the factors of effective net area is required.
노만택,조양자,김용식,최용,조보현,최장원,정용훈 大韓免疫學會 1996 大韓免疫學會誌 Vol.18 No.4
CTLA-4, a T cell activation antigen and a homologue of CD28, was originally identified as a gene by a series of reverse genetic approaches. While CD28 molecule has been characterized well as a stimulator of T-cell function via enhanced lymphokines production and stablilization of those mRNA, most of the functions of CTLA-4 remain unknown. It has been widely accepted that CTLA-4 functions as an immune suppressor which is down-regualting the function of CD28. We previously showed that 34 KD form of this antigen mainly expressed CD8+ subset, a cytotoxic or suppressor, of activated peripheral blood lymphocyte. Based on our previous finding this study was conducted to further characterize immunological function of CTLA-4 especially in terms of involvement of this molecule in T-cell effector function mediating target cell cytotoxicity. 4 human T cell clones with different target cytotoxicities were employed in this study. NBL46 (CD4+) and NBL77 (CD8+) were cytotoxic and NBL32 (CD4+) and NBL58 (CD 8+) were non-cytotoxic to target LBF cell in target cell chromium release assay. And in Western blot assay 34 kD antigen was detected in NBL46 (CD4+) and NBL77 (CD8+) clones but not in NBL32 (CD4+) and NBL58 (CD8+) clones. It was summarized that expression of the CTLA-4 antigen was associated with cytotoxicity but not with subset phenotypes of T cells. In conclusion CD8+ T subset of PHA-stimulated PBL was major and only CTLA-4 producer and this molecule was induced during mid to late stage of T cell activation. The cytotoxicity of T cell clones to its target cell was directly correlated with its CTLA-4 production and vice versa. And it was highly suggested that primary function of CTLA-4 may involved in T cell effector function which mediates target cell killing.
인장력을 받는 ㄱ형강 접합부의 감소계수 U값에 관한 연구
표영석,윤성호,나승욱,신영록,김보영,최문식 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
This study focuses on the inspect of effective net area design code, according to limited state design criteria of steel structures, recently established in Korea, by an experiment on the joint of angle tension members on the ground. reduction factor. The methods of this study were to compare other study results on effective net area rupture mode and ultimate capacity, and to evaluate the propriety of the criteria design code. The result is that code in force limited state design criteria of steel structures and AISC-LRFD joint of angle tension members predicted load and experiment depend on ultimate capacity difference. Therefore, it is thought that there is need for supplemental test and study to effective net area of tension joint focused on bolted connection of angle.
인장력을 받는 ㄷ형강 고력볼트 접합부의 감소계수 U값에 관한 연구
김진숙,표영석,나승욱,신영록,김보영,최문식 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
The purpose of this paper is to examine the influence of reduction coefficient according to the limit state design of steel structures in the bolted joints of tension members. It was carried out the tensile testing about high strength bolted connections performed in structural steel channels. Considered parameters are the number and row of bolts, the connection length, connection eccentricity of the specimen. The test results showed that failures generally came (a) classic net section, (b) block shear failures. We found that the professional factor, obtained by calculating the test failure load divided by the nominal specification strength, is lower than 1.00. We thought that the reason was the moment produced by eccentric loading depends upon the connection geometry as well as the rotational stiffness of the connection.
Evaluation on the Energy Performance of PAS Wall Applying Vacuum Insulation
Choi, Bo Hye,Choi, Gyeong Seok,Kang, Jae Sik,Lee, Seung Eon Trans Tech Publications, Ltd. 2013 Advanced materials research Vol.689 No.-
<P>This study evaluates the insulation performance of the PAS so as to analyze the exterior insulation system, PAS(Panel Approach System), which is fixed to the structure by conducting a mock-up test and then calculates the linear thermal transmittance of the interior insulation and PAS-applied areas through a 3-dimensional steady state heat transfer analysis so as to conduct a comparison analysis of heat performance on the interior insulation system in thermal bridge areas. According to the results of the mock-up test conducted to evaluate the insulation performance of the PAS, the thermal transmittance value measured 0.15W/㎡K which shows outstanding insulation performance when compared to the Korean outer wall standard of apartment buildings that is 0.27~0.36W/㎡K. Moreover, as a result of calculating the linear thermal transmittance of the PAS in contrast to the interior insulation system through a heat transfer analysis of thermal bridge areas, the interior insulation measured 0.851W/mK, and 0.029W/mK when the PAS was applied. Thus, the insulation performance in thermal bridge areas was reduced by 96.6% in contrast to the interior insulation when the PAS was applied.</P>
Design of the Envelope System to Implement the Zero-Energy on High Rise Multi-Unit Dwelling in Korea
Choi, Bo Hye,Choi, Gyeong Seok,Kang, Jae Sik,Song, Seung Yeong Trans Tech Publications, Ltd. 2014 Applied Mechanics and Materials Vol.525 No.-
<P>The market size of green building is presumed to be occupying about 5% on construction market in 2008. Since then, the green building market kept enlarged up to about $3.7 trillion. Eventually, the market is forecast to grow about $78 trillion in 2020. According to the case of Passive House in Germany, the house is no longer high cost and future-oriented dwelling form but customer can afford like an existing house due to a drop in prices. Therefore, it is predicted to obtain a competitive price on the Green Home market soon in Korea. This research demonstrates the possibility to secure economics at this stage when the Zero-Energy on High Rise Multi-Unit Dwelling is fulfilled with a commercialization and consisted of expended incentive policy.</P>