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작교이방성 판이론을 적용한 바닥판 활하중 모멘트 산정식 개발
안예준(Ahn Ye Jun),남석현(Nam Suk Hyun),박장호(Park Jang Ho),신영석(Shin Yung Seok) 대한토목학회 2007 대한토목학회논문집 A Vol.27 No.5A
교축과 교축직각 방향의 철근비가 다른 철근콘크리트 바닥판은 두 방향의 휨 강성이 다르기 때문에 직교이방성의 재료성질을 가진다. 이러한 철근콘크리트 바닥판의 직교이방성 성질은 교량의 바닥판 휨모멘트에 영향을 미친다. 2004년 개정된 AASHTO LRFD Bridge Desi맑 Specification은 활하중에 의해 바닥판에 작용하는 휨모멘트를 산정하는데 휨 강성비를 고려하고 있지만, 국내의 도로교설계기준(건설교통부, 2005)는 휨강성비를 고려하지 않고 있다. 또한 도로교 표준시방서 하중저항계수 설계편(대한토목학회, 1996)의 활하중 모멘트 값은 휨강성비를 고려하고 있으나, 단일 하중만을 고려하고 있기 때문에 안전한 값으로 보기 힘들다. 본 연구에서는 국내 설계기준에 제시된 트럭 하중모델과 승용차 전용 고가도로 설계용 활하중모델에 대하여 휨 강성비와 다수의 윤하중을 고려한 바닥판 활하중 모멘트 산정식을 제안하고자 한다. 직교이방성 판이론을 이용하여 철근콘크리트 바닥판에 작용하는 휨모멘트를 산정하였다. 바닥판 활하중 모멘트 산정식에는 국내 설계기준 및 시방서에 제시된 하중계수, 동시재하계수, 및 트럭하중모델을 각각 적용하였다. Because of the orthotropic elastic properties and a significant two-way bending action, orthotropic plate theory may be suitable for describing the behavior of concrete-filled steel grid decks. In AASHTO LRFD Bridge Design Specification(2004), the equations for live load moment consider a ratio of flexural rigidity between longitudinal and transverse directions, but not in the Korea design specification of highway bridge (2005). The Korea LRFD bridge standard specification of highway(1996) includes an orthotropic plate model with single load to estimate effects induced by live load moments of concrete-filled steel grid decks. However, the orthotropic plate model considering only single patch load may not be conservative. This paper presents live load moment equations for truck and passenger car, based on the classical orthotropic plate theory, which includes multiple patch loads. Design factors and live load models of Korea standard specification of highway bridge is applied to proposed formulations.
돼지감자 에탄올 추출물의 구강편평세포암 YD-10B 사멸효과
안예준, 김은정 상지대학교 한의학연구소 2022 尙志韓醫論文集 Vol.10 No.1
Jerusalem artichoke (Helianthus tuberosus L.) is a perennial plants, its natural compound is known to exhibit blood sugar control. In this study, we investigated the growth inhibitory effect of ethanol extract of Jerusalem artichoke on oral squamous carcinoma YD-10B cells. Jerusalem artichoke tubers were extracted by ethanol and treated for cell viability. The ethanol extract of Jerusalem artichoke showed the most significant growth inhibitory effect at 1000 Lg/ml concentrations. It was confirmed that apoptosis was induced in the Sub-G1 step by treating the ethanol extract of Jerusalem artichoke, at a concentration of 1000 Lg/ml. As a result, it was more than twice as high as that of the control group. In conclusion, it is suggested that the ethanol extract of Jerusalem artichoke exhibits high inhibition of proliferation and apoptosis of YD-10B cells, and thus has a possibility as an anticancer drug.
돼지감자 덩이줄기와 잎 추출물의 구강암세포 성장 억제 활성 비교
정현규, 안예준, 김유정, 김지훈, 반효은,이은비, 정하영, 오준희, 이승윤, 김은정1,2 상지대학교 한의학연구소 2020 尙志韓醫論文集 Vol.8 No.1
Jerusalem artichoke (Helianthus tuberosus L.) is a perennial plants, its natural compound is known to exhibit blood sugar control. In this study, we investigated the growth inhibitory effect of ethyl acetate extract of the leaves and tubers of Jerusalem artichoke on oral squamous carcinoma YD-10B cells. Jerusalem artichoke leaves and tubers were extracted by ethyl acetate and treated for cell viability. The extract of the leaves of Jerusalem artichoke had the highest extraction yield at 3.30%. The viability of YD-10B cells treated with 300 ㎍/㎖ Jerusalem artichoke tubers extract or 25 μg/㎖ Jerusalem artichoke leaves extract were significantly inhibited. In conclusion, these results showed a yield of 20 times higher in Jerusalem artichoke leaves and showed the same cell viability at 12 times less concentration than Jerusalem artichoke tubers.
박장호,신영석,안예준,이광균,Park, Jang-Ho,Sin, Yeong-Seok,An, Ye-Jun,Lee, Gwang-Gyun 한국건설안전협회 2011 建設 安全技術 Vol.52 No.-
This study presents an algorithm to select the best alternative plane among various bridge superstructure types (Steel box girder, Rational girder, PSC-I girder) using Value Engineering (VE). Economical efficiency, landscape, constructability, maintenance, stability, function of bridge superstructure were taken into consideration in the designing of bridge. Economical efficiency was evaluated for each alternative plan with optimal design considering Life Cycle Cost (LCC), Repair and rehabilitation histories and some factors were set to get reasonable results. In the application of Analytic Hierarchy Process (AHP), consistency of Pairwise Comparisons Matrix was evaluated and the best plan was determined.
박장호,신영석,안예준,이광균 한국안전학회 2009 한국안전학회지 Vol.24 No.6
This study presents an algorithm to select the best alternative plane among various bridge superstructure types(Steel box girder, Rational girder, PSC-I girder) using Value Engineering(VE). Economical efficiency, landscape, constructability, maintenance, stability, function of bridge superstructure were taken into consideration in the designing of bridge. Economical efficiency was evaluated for each alternative plan with optimal design considering Life Cycle Cost(LCC). Repair and rehabilitation histories and some factors were set to get reasonable results. In the application of Analytic Hierarchy Process(AHP), consistency of Pairwise Comparisons Matrix was evaluated and the best plan was determined.