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안남식(Ahn Nam-Shik),최준호(Choi June-Ho),박덕근(Park Duk-Kun),이영학(Lee Young-Hak) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
As a trend of construction has become high-rise and larger, it is necessary to reduce the self-weight of structures and buildings. One of the alternative plans to reduce the self-weight of structures and buildings is to use the lightweight aggregate concrete. In this study, experiments to make the moderate mixing proportion of polymer modified lightweight concrete were performed. As a hardened concrete test, the resistance of freezing and thawing was performed and investigated.
SBR Latex를 이용한 폴리머 개질 경량콘크리트의 특성에 관한 실험적 연구
안남식,원동민,박노현,김희철,김관수,Ahn, Nam-Shik,Won, Dong-Min,Park, Noh-Hyun,Kim, Hee-Cheul,Kim, Kwan-Soo 한국공간구조학회 2009 한국공간구조학회지 Vol.9 No.4
As a trend of construction has become high-rise and larger, it is necessary to reduce the self-weight of structures and buildings. One of the most effective methods to reduce the self-weight of structures and buildings is to use the lightweight aggregate concrete. To complement the strength of the lightweight aggregate concrete, polymer was added to concrete's mixing. In this study, experiments to make the moderate mixing proportion of polymer modified lightweight concrete were performed. Also the hardened concrete tests were performed to investigate the physical characteristics of the polymer-modified lightweight aggregate concrete. As a result, the flexural strength was increased by a small quantity of SBR Latex. Based on the test results the estimating equation was proposed through the regression analysis. 건축물이 고층화 및 대형화 되어감에 따라 구조물 및 빌딩의 자중을 줄이는 것은 반드시 필요하게 되는데, 이러한 구조물 의 자중을 줄이기 위한 가장 효과적인 방법 중 하나는 경량콘크리트를 사용하는 것이다. 본 연구에서는 경량콘크리트의 단점인 강도를 보완하기 위하여 폴리머를 첨가하였으며, 폴리머 개질 경량콘크리트의 적절한 배합비율을 도출하기 위한 실험을 수행하였다. 또한 경화콘크리트 시험을 통하여 폴리머 개질 경량콘크리트의 물리적 특성을 고찰하였다. 그 결과 소량의 폴리머 첨가로도 휨강도가 증가하였으며, 실험결과를 바탕으로 회귀분석을 통한 압축강도 추정식을 제시하였다.
랫드와 비글에서 GC-100X 세정제의 독성에 대한 연구
강경선,조성대,안남식,정지원,양세란,박준석,박기수,홍인선,서민수,조은혜,이영순,Kang, Kyung-Sun,Cho, Sung-Dae,Ahn, Nam-Shik,Jung, Ji-Won,Yang, Se-Ran,Park, Joon-Suk,Park, Ki-Soo,Hong, In-Sun,Seo, Min-Soo,Jo, Eun-Hye,Nguyen, Ba Tiep,Lee, 대한수의학회 2004 大韓獸醫學會誌 Vol.44 No.1
Because cleaning products are part of our everyday lives, it is essential that they should not present significant risks to health. However, many petrochemicals in most soaps and detergents can be absorbed through the scalp and skin and, over time, accumulate in the organs and tissues. This accumulation may result in brain, nerve, and liver damage. Therefore, it is interested in developing non-harmful detergent. According to Korea Research Institute of Chemical Technology, GC-100X may be non-harmful and non-corrosive alkaline ionic water (pH 12). It is composed of hydroxyl radicals and supplemented with xylitol. To evaluate influence of GC-100X on rats and beagles, GC-100X was diluted with distilled water (25%, 50%, and 100% solution respectively). Each of diluted GC-100X was daily treated per oral. In body weight analysis, urinary analysis, ophthalmological test and autopsy, we did not find any significance, but in serum biochemical analysis and hematological analysis, we found some significances in middle dose group compared with control group. These significances in serum biochemical analysis and hematological analysis may be not induced by GC-100X, because it was not found to be significant from control group in histopathological examination. Thus, it is concluded that NOEL(No Observed Effect Level) of GC-100X may be higher than all treatment doses used in this study, and GC-100X may be a non-toxic detergent.
비특이 면역증강제 BARODON<sup>ⓡ</sup>의 항원성시험
조은혜,조성대,안남식,정지원,양세란,박준석,박기수,홍인선,서민수,이영순,강경선,Jo, Eun-hye,Cho, Sung-dae,Ahn, Nam-shik,Jung, Ji-won,Yang, Se-ran,Park, Joon-suk,Park, Ki-su,Hong, In-sun,Seo, Min-su,Tiep, Nguyeu Ba,Lee, Yong-soon,Kang, K 대한수의학회 2003 大韓獸醫學會誌 Vol.43 No.2
The antigenicity of nonspecific immunostimulator BARODON$^{(R)}$, a newly developed drug, was investigated by tests for passive cutaneous anaphylaxis (PCA) and active systemic anaphylaxis (ASA) in mice and guinea pigs. In ASA test using guinea pigs, there were no significant clinical symptoms in all individuals of low(0.3%) and high(3%) dose of both groups treated with only BARODON$^{(R)}$ and cotreated with BARODON$^{(R)}$ and adjuvant group. In PCA test, blue spots of Evan's were observed from $2^6$ to $2^{10}$ in homologous group and from $2^2{\sim}2^5$ dilution rate in heterologous group of BSA treated positive control group. However, intradermal sensitization with antiserum obtained from low (0.3%) and high (3%) dose of BARODON$^{(R)}$ only treatment group and treated-with-adjuvant group, followed by intravenous injection of respective antigen and Evan's blue mixture (1:1) showed no blue spot observed. In conclusion, BARODON$^{(R)}$, as showed in ASA and PCA test, did not cause anaphylatic shock when treated 3 and 10 times higher than clinically intended dose, nor induce IgE, so that might not have antigenic properties in mice and guinea pigs.
콘크리트의 인장강성을 고려한 플랫 플레이트의 처짐 해석
김민숙(Kim, Min-Sook),김희철(Kim, Hee-Cheul),안남식(Ahn, Nam-Shik),이영학(Lee, Young-Hak) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.10
A finite element model for deflection of reinforced concrete flat plates is presented. In this paper, a layered degenerated shell element was adopted for finite element analysis. The proposed finite element model account for material non-linearities, uncracked concrete is considered as an isotropic linear elastic material, and after cracking, the concrete is considered to be an orthotropic material. The finite element model of this paper was verified comparing with existing experimental results. It is shown that a good agreement between proposed model and experimental results. A parametric study also has been conducted to verification of influence of several parameters in terms of the reinforcement ratio, boundary condition, modulus of rupture. The deflection of reinforced concrete flat plates varied depending on the reinforcement ratio, boundary condition.
박덕근(Park Duk-Kun),이재홍(Lee Jae-Hong),안남식(Ahn Nam-Shik),이기학(Lee Ki-Hak),권준범(Kwun Joon-Bum) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
This study presents nonlinear analysis of under-tension structures. In the regard, the under-tensioned system enables the load of upper parts to carry to the end of beam by means of tensional force in cable. The under-tensioned system on lower part of the structures is applied in order to reduce the deflection. Structure with under-tension system redistributes member force by pretension value in the cable. Member force makes effective size of member. In this paper, nonlinear analysis using finite element method is used. This study is performed with conforming of the effect by pretension value in the cable. Dead and live loads are supposed to apply nodal load on the top member. The member force and deflection of the structure are compared with MIDAS.