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Excited State Dynamics of Curcumin and Solvent Hydrogen Bonding
양일승,진승민,강준희,Venkatnarayan Ramanathan,김형민,서영덕,김성근 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.8
Curcumin is a natural product with antioxidant, anti-inflammatory, antiviral and antifungal functions. As it is known that the excited state intramolecular hydrogen transfer of curcumin are related to its medicinal antioxidant mechanism, we investigated its excited state dynamics by using femtosecond transient absorption spectroscopy in an effort to understand the molecule’s therapeutic effect in terms of its photophysics and photochemistry. We found that stronger intermolecular hydrogen bonding with solvents weakens the intramolecular hydrogen bonding and decelerates the dynamical process of the enolic hydrogen. Exceptions are found in methanol and ethylene glycol due to their nature as simultaneous hydrogen bonding donor-acceptor and high viscosity solvent, respectively.
양일승,지민규,전병훈 한국청정기술학회 2017 청정기술 Vol.25 No.4
The composting is a biological process that converts organic matter into useful resources such as fertilizers. It is a continuous transition of microbial communities to adapt changes in organic matter and environmental conditions (carbonation rate, temperature, humidity, oxygen supply, pH, etc.). Most of the composting plants are located in the proximity of the residential areas. It is a general scenario where government authorities receive complaints from the local residents due to release of odor from the composting, and has become a social problem in Korea. Identification of dominant microorganisms, understanding change in microbial communities and augmentation of specific microorganism for composting is vital to enhance the efficiency of composting, quality of the compost produced, and reduction of odor. In this paper, we suggest the optimum operation conditions and methods for compost depot to reduce odor generation. The selection of the appropriate microorganisms and their rapid increase in population are effective to promote composting. The optimal growth conditions of bacteria such as aeration (oxygen), temperature, and humidity were standardized to maximize composting through microbial degradation. The use of porous minerals and moisture control has significantly improved odor removal. Recent technologies to reduce odor from the composting environment and improved composting processes are also presented. 퇴비화 과정은 유기물질을 비료와 같은 유용한 자원으로 전환하는 생물학적 과정이다. 퇴비화는 유기물과 환경조건(탄질율, 온도, 습도, 산소공급, pH 등)의 변화에 적응하는 미생물 군집의 연속적인 천이과정으로 이해될 수 있다. 우리나라에서의 유기성 폐기물을 처리하는 퇴비사의 악취는 도시화 가속화에 따른 신도시개발, 공장이나 주거지역들의 생활지역 근접화에 따라 악취를 발생시키는 원인이 되어 관공서에 민원이 제기되는등 사회적인 문제가 되고 있다. 이의 저감방안으로 퇴비사에서 우점하는 미생물을 규명하고 미생물 군집의 변화를 조사, 연구하여 생장환경에 맞게 적용하는 것은 퇴비공정의 효율적인 개선과 생산된 퇴비의 품질제어, 악취저감 측면에서 매우 중요하다. 본 논문에서는 퇴비화에 있어 최적의 운용기술과악취발생을 저감하는 방법들을 중심으로 고찰하였다. 퇴비화 공정에서 부숙활동에 효과적인 올바른 미생물종의 선택과 개체수의 빠른 증가가 부숙을 촉진시킨다. 이에 따른 미생물 분해활동을 통한 부숙 극대화를 위한 공기량(산소), 온도, 습도 등박테리아의 최적 생장조건을 제시하였다. 악취제거 및 수분조절기능이 있는 다공성광물을 사용했더니 악취가 현저하게 개선되어 졌다. 미생물의 생장조건을 최적화․부숙환경을 개선, 부숙을 촉진시켜 악취를 저감하는 최근기술들도 제시하였다.
양일승,최성모 대한건축학회 2010 大韓建築學會論文集 Vol.26 No.3
<P>Metallurgical connection methods, such as stud weld and puddle weld, have been used for a long time to attach a steel beam and a steel deck. Power actuated fasteners in sort of mechanical methods have appeared to be an alternative to metallurgical methods in the connection of a structural steel member and a thin steel plate. Power actuated fasteners can be driven by power actuated tools or by pneumatically driven tools. This mechanical connection method has many advantages over metallurgical connection methods. First of all, a power supply is unnecessary and there are no concerns about an electrical accident. However, the handling of the mechanical connection method takes severs caution. Since the sound at the time of installation is loud, discretion is needed in a quiet place. Above all, when a pin is installed in a steel beam, the cross-section of the steel beam is reduced. Therefore, the effect of the pin on the tensile properties of the steel beam is the focus of this research. The main parameters are steel plate thickness, notch size, steel type, and damage types, that is, non-damage, drilled hole, and driving pin. This research supplies the fundamental data to the design criterion of this mechanical method by clarifying the influence of the mechanical method on the tensile property of the structural steel member. In a test results, the strength of specimens using driving pin was not differenced that of normal specimen but decreased deformation capacities and elongation.</P>
양일승,김순철,박완신 대한건축학회지회연합회 2014 대한건축학회연합논문집 Vol.16 No.4
This paper addresses an experimental behavior of stub columns and flexural members made of 570MPa steel pipes for aseismatic building structures as a fundamental study to enhance the applicability of high strength steel. In this study, mechanical properties(chemical compositions, mechanical test, charphy impact test, welding performance etc) and structural performance of 570MPa steel pipes in accordance with their width-thickness ratio are quantitatively estimated. A total seven specimens(stub column:3ea, flexural specimen:4ea) are tested. The main results show that : 1) maximum strength of stub columns and bending specimens are shown 1.02~1.21, 1.23~1.38 times of calculated values. 2) the final modes of stub column specimens and bending specimens are obtained by the local buckling.
드라이빙핀전용 전단연결재를 이용한 불완전 합성보의 구조성능
양일승,김순철,박완신 대한건축학회지회연합회 2013 대한건축학회연합논문집 Vol.15 No.5
합성보는 용접에 의한 전단연결재를 사용하는 것이 일반적이며, 구조물의 강성, 강도 및 안전성 향보를 위해 가장 효율적인 시스템이다. 그러나, 스터드용접은 전기 충격과 용접 결함 등의 문제가 있다. 본 논문은 수직하중 하에 드라이빙핀을 이용한 전단연결재를 사용한 불완전 합성보의 실험결과를 보여주고 있다. 실험결과, 모든 실험체에서 안정된 이력거동을 나타내고 있기때문에 기존 용접에 의한 스터드볼트 대용으로 사용할 수 있을 것으로 판단된다.