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.

Anti‑inflammatory effect of Rosa laevigata extract on in vitro and in vivo model of allergic asthma via the suppression of IgE and related cytokines

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.

네트워크 환경에서의 e-CRM 성과향상 전략

최윤홍,한승오 호남대학교 2003 호남대학교 학술논문집 Vol.24 No.1

In order for successful e-CRM, customer data needs to be gathered and analyzed, a long-term viewpoint is necessary and a consensus on the importance of e-CRM must be obtained. The strategies for the improvement of e-CRM in the networked environment are like the following. First, it must be approached strategically. Second, efficiency of sharing and usage of obtained information must be increased. Third, proper personification (customization) must be carried out. Fourth, goal-oriented preliminary CRM must be managed. Fifth, partners must be utilized effectively and aggressively. Proper results of CRM(Customer Relationship Management) cannot be obtained by just simply applying the system, but requires constant modification and improvement. Effective usage of CRM will only occur when constant effort and research is put into it by the company.

남은음식물 비육우 사료자원화 분석

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.

다단식 이중관기포탑내의 기액간 물질전달

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.

한우 광역브랜드 사업전략

한성일,최승철 한국농업정책학회, 한국축산경영학회 2003 농업경영정책연구 Vol.30 No.3

Consumers are demanding for good quality and safety fresh-meat. Books of brand management are popularized, but not of Hanwoo brand cases. Case studies have a long history as effective tools to business person and as an interesting way to learn how to apply analytical tools in true-to-life agri-business. This study deals with three cases of regional Hanwoo brand initiative and derives the strategy of region-level business. Regional Hanwoo brand to succeed has several tasks and solutions such as marketing mind of consumer sovereignty, management of brand product, administration of blood lines and recording-keeping, joint efforts with other all related institutions, and long-run consumer research and systematic backup.

YIG Ferrite계의 결정구조 연구

최승한 慶山大學校 基礎科學硏究所 2000 基礎科學 Vol.4 No.2

Yttruim iron garnet(YIG)인 Y₃Fe_5O_12에서 Yttruim 이온을 다양한 금속으로 치환시킨 Y_3-xFe_5+xO_12(x=0.0, 0.18, 0.33, 0.6), Y_3-xIn_xFe_5O_12(x=0.0, 0.18, 0.33, 0.6), Y_3-xGd_xIn_0.2Fe_4.8O_12(x=0.2, 0.4, 0.6)의 결정구조 및 결정학적 특성을 X-선 회절법을 통해 연구하였다. 실온에서 측정된 X-선 회절상을 분석한 결과 전체 조성비 영역에서 단일상의 garnet 구조를 가지며 Y_3-xFe_5+xO_12에서는 전반적으로 치환량이 증가함에 따라 격자상수가 감소하는 경향을 나타냈다. 그러나 Y_3-xGd_xIn_0.2Fe_4.8O_12와 Y_3-xIn_xFe_5O_12계에서는 치환량 증가에 따라 격자상수가 증가함을 알 수 있었다. 격자상수값들이 조성비가 증가함에 따라 선형적으로 변화된 것은 치환된 이온의 반경에 따른 것이며 Vegard's law로 인해 나타나는 결과로 해석할 수 있었다. The substituted yttrium iron garnet systems Y_3-xFe_5+xO_12(x=0.0, 0.18, 0.33, 0.6), Y_3-xIn_xFe_5O_12(x=0.0, 0.18, 0.33, 0.6), Y_3-xGd_xIn_0.2Fe_4.8O_12(x=0.2, 0.4, 0.6) have been investigated by means of X-ray diffraction method. The X-ray diffraction patterns at room temperature confirm the samples to have a single phase of the garnet structure over the whole composition range. The lattice constants of all the sample linearly change with increasing x due to the size of substituted ions in the dodecahedral sites, which is attributed to Vegard's law.

農地基本法(假稱) 制定의 基本方向 : 農地流動化 關聯法律을 中心으로

崔承基,韓昇熙 안성산업대학교 1993 論文集 Vol.25 No.-

In the late 1993, the Uruguay Round negotiation that had been delayed for seven years have reached an agreement dramatically. Net importer or occassionally self-sufficient in agricultual products trade, our country is tossed about in the large billows which can't help importing the 15 NTC(Non Trade Concerns) Agricultural Products involved rice by tariffs without exception. To prepare for the open-door agricultural policy, it has been requested that we must be strengthening the competition and efficiency in agricultural sectors, To achieve the goals, the laws related to a farm-land must be settled beforehand as fellows, First of all, it is desired that realistically the alienated five laws related to a farm-land must be abrogated resolutely and two or four laws be mergered into the Farm-land Law. Secondly, the three-hectare requirements must be abolished not to continuously adjust the upper limit. Thirdly, it must be prerequisite for holding fast to the principle of tiller-owned farmland. Therefore, the transaction and rent of farmland must be limited to farmers and producer's groups. Fourthly, A range of tillers must be extended into the producer's related groups for the extensive utilization of farmland. Lastly, The fertile farmland within the zone of agricultural promotion must be thoroughly pre-served as absolute farmland had been preserved.

공공도서관 이용자공간의 공간구성에 관한 연구

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.

섬유아세포 동종이식을 이용한 당뇨족부 궤양의 치료

최규진,한승규,김우경 大韓成形外科學會 2004 Archives of Plastic Surgery Vol.31 No.2