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Simplified Effective Compressive Strengths of Columns with Intervening Floor Slabs
Seung?Ho Choi,Jin?Ha Hwang,Sun?Jin Han,Hae?Chang Cho,Jae Hyun Kim,Kang Su Kim 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.5
The current design codes discuss the effective compressive strengths of columns, which reflect a decrease in load transfer performance that can occur when columns and slabs have different concrete compressive strengths. The effective compressive strength of a column increases as it is confined by the slab, and the design codes mandate three different effective compressive strengths for interior columns (confinement on four sides), exterior columns (confinement on three sides), and corner columns (confinement on two sides). For both corner and exterior columns, the confinement effect of the slab is significantly smaller than that for the interior column, and there is a more marked decrease in load transfer performance. However, there is still a lack of theoretical studies investigating the effective compressive strengths of the corner and exterior columns. Therefore, based on the analysis model established in previous research, this study has proposed an equation for calculating the effective compressive strengths of the corner, exterior and isolated columns without any confinement effects of the slab. In addition, axial loading tests of isolated columns were conducted and the proposed equation was verified.
Seung‑Hyeon Lee,Seung‑Han Choi,In‑Seung Lee,Yumi Kim,Eun‑Jin An,Hyeung‑Jin Jang 대한독성 유전단백체 학회 2020 Molecular & cellular toxicology Vol.16 No.2
Backgrounds Exposure to a toxic stress environment leads to excessive inflammatory reactions and induces allergic asthma resulting in airway hyper-responsiveness. We investigated whether Rosa laevigata Michx. (RL) exhibits anti-inflammatory effects related allergic asthma in both an in vitro and in vivo studies. Methods To investigate the preventive effect of RL, A549 cells were pretreated with non-toxic doses of RL (500, 1000 μg/ mL) and induced by epidermal growth factor (EGF) (10 ng/mL). First, we evaluated cytotoxicity via a MTT assay. The inhibitory effects of NF-κB activity and COX-2 expression were confirmed by a western blot assay. In the in vivo study, BALB/c mice were challenged with regard to ovalbumin via an intraperitoneal injection of RL (50, 100 mg/kg) and were killed to collect bronchoalveolar lavage fluid, lung tissues and blood serum. The number of inflammatory cells, the secretion of IgE and related cytokines were monitored by ELISA and multiplex assays. Results RL significantly suppressed NF-κB activity and COX-2 expression levels in EGF-induced A549 cells. In a chronic inflammation mice model, pretreatment of RL attenuated allergic airway inflammation by reducing inflammatory cells, the secretion of IgE and related cytokines in a dose-dependent manner. Conclusions The results of this study present the possibility of RL as a therapeutic agent for allergic asthma patients via the suppression of IgE and related cytokines.
한승완,최일곤,김상렬 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1
The effect of gas houdup and volumetric liquid-phase mass transfer coeffecient in the bubble coplumn with multiple draft tube were investigated experimentally, according to gas velocity, plate interval and the diameter and plate number of draft tube at 298±0.5K. The gas holdup and volumtric liquid-phase mass transfer coeffecient increased with decreasing the interval of draft tube when the diameter ratio of draft was small but decreased when the diameter ratio of draft tube was large. Also based on these observations, correlation equations of gas holdup and volumetric liquid phase mass transfer coefficients were proposed.
농협배합사료 마케팅전략 모색 : Marketing Strategies of Agricultural Cooperative Feed
한성일,최인희,최승철 한국농업정책학회, 한국축산경영학회 2001 농업경영정책연구 Vol.28 No.2
The most burdensome thing in the production cost of Korean livestock farms is feed purchasing cost. This paper seeks feed cost advantage of Agricultural Cooperative's. Agricultural Cooperative to be a attractive seller must reconstruct marketing channel shorter and provide services of various information.
한화진,박승환,최무혁 대한건축학회 2004 대한건축학회논문집 Vol.20 No.4
The purpose of this thesis is providing basic data for making establishment of space composition for library users through satisfaction rate of using library and the requirement rate of survey about space composition in terms of library users. Conclusions are as follows. First, there are three types of space compositions considering library users such as a independent space composition(Type A), an open space using lobby(Type B), a multiple space composition(Type C). Prevalent Type B public libraries which are made since 1999 shows the fact that the public libraries space composition have been opened pretty much so far. Second, the result of satisfaction surveying according to space composition condition(Type A B C) shows that Type B and C have much more satisfaction than A has in terms of visual opening, connections with other rooms, furniture arrangements in the inside of the house. Third, on the result of perpendicular analyzing about education, information and culture space composition, the educational function plays an important role with the cultural functions in the main floor. However, at the same time, it is requested that reading space, information space, periodical journal sections should be arranged in it.
기포탑내에서 부유물 첨가에 의한 기체체류량과 물질전달계수에 관한 연구
최일곤,한승완,하종열,김상렬 東亞大學校 大學院 1994 大學院論文集 Vol.19 No.-
Gas holdup and volumeteric liquid phase mass transfer coefficient in a bubble column with granular activated carbon were measured according to partcle size and concentration of granular activated carbon and gas velocity. The results of the experiments were as follows ; 1. Gas holdup and volumetric liquid phase mass transfer coefficient increase with increasing the gas velocity. 2. Gas holdup has no effect on concentration of granular activated carbon, but volumetric liquid phase mass transfer coefficient decrease with increasing the concentration. 3. Gas holdup increase with being enlarged particle size of granular activated carbon, but volumetric liquid phase mass transfer cofficient decrease. 4. Correlations among various parameters having an influence on Gas holdup and volumetric liquid phase mass transfer coeffient were expressed by Eq.(9) and Eq.(10) respectively.
디지털카메라를 이용한 3차원 측량 기법 개발에 관한 연구
崔哲淳,崔勝弼,韓元浩,金東熙 관동대학교 1997 關大論文集 Vol.25 No.2
Photographic survey is possible that it can survey the simultaneous three-dimensional survey about so many points, therefore it is so fast and precisely. We takes a snap the objects with digital carema, and input the data to the computer from this data. We can take the three-dimensional coordinate through relative orientation, absolute orientation and have to check the merit of three-dimensional suveying. Otherwise we can get the error in one centimeter after analysis three-dimension coordinate and we can get the higher precise accuracy cause to set the camera angle of 20∼45 degrees.
방광의 이행상피암에서 p53과 PCNA 분포에 관한 연구
최은정,강상균,양승하,김대중,김의한 순천향의학연구소 1996 Journal of Soonchunhyang Medical Science Vol.2 No.2
Immunohistochemical studies were carried out to observe the expression of p53 protein and PCNA in transitional cell carcinoma (TCC), then analyzed according to the tumor grade and progression. 38 cases of TCC consist of 13 cases grade Ⅰ, 12 cases grade Ⅱ and 13 cases grade Ⅲ respectively. Results obtained are as follows. 1. p53 protein expression was seen in 60% of cases(15 out of 38 cases) In the poorly differentiated area and infiltrated lesion, tumor cell showed more strong positive reaction of p53 protein compared with well differentiated area. 2. All of 38 cases of TCC showed PCNA positive expression. The more strong positivity was seen in the poorly differentiated area and the more intense positive reaction was noted in the basal layer of the tumor nests. 3. The above results showed that positivity of p53 protein and PCNA are closely related with tumor cell differentiation(grade) and progression. It is concluded that positive reaction of p53 protein and PCNA may contribute to detection of tumor growth and prognosis of patient.
한성일,최승철 한국농업정책학회, 한국축산경영학회 2001 농업경영정책연구 Vol.28 No.3
This study focuses on the use of food residual feed, particularly the use on beef production. To analyze economic performance of the use, farmers were separated into and surveyed by two groups: food residual feeding group (group A) and common feed feeding group(group B) in Southern Yangju-Gun. Results show that farmer group A has lower feed costs only by 60% than that of group B, representing a cost advantage.