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인장력을 받는 ㄱ형강 접합부의 감소계수 U값에 관한 연구
표영석,윤성호,나승욱,신영록,김보영,최문식 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
This study focuses on the inspect of effective net area design code, according to limited state design criteria of steel structures, recently established in Korea, by an experiment on the joint of angle tension members on the ground. reduction factor. The methods of this study were to compare other study results on effective net area rupture mode and ultimate capacity, and to evaluate the propriety of the criteria design code. The result is that code in force limited state design criteria of steel structures and AISC-LRFD joint of angle tension members predicted load and experiment depend on ultimate capacity difference. Therefore, it is thought that there is need for supplemental test and study to effective net area of tension joint focused on bolted connection of angle.
인장력을 받는 ㄷ형강 고력볼트 접합부의 감소계수 U값에 관한 연구
김진숙,표영석,나승욱,신영록,김보영,최문식 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
The purpose of this paper is to examine the influence of reduction coefficient according to the limit state design of steel structures in the bolted joints of tension members. It was carried out the tensile testing about high strength bolted connections performed in structural steel channels. Considered parameters are the number and row of bolts, the connection length, connection eccentricity of the specimen. The test results showed that failures generally came (a) classic net section, (b) block shear failures. We found that the professional factor, obtained by calculating the test failure load divided by the nominal specification strength, is lower than 1.00. We thought that the reason was the moment produced by eccentric loading depends upon the connection geometry as well as the rotational stiffness of the connection.
Total Synthesis of Laetevirenol A
Choi, Young Lok,Kim, Bum Tae,Heo, Jung-Nyoung American Chemical Society 2012 Journal of organic chemistry Vol.77 No.19
<P>The first complete synthesis of laetevirenol A was performed in nine steps via intramolecular Friedel–Crafts alkylation in a <I>trans</I>-selective manner. The key phenanthrene intermediate was synthesized by a one-pot Suzuki–Miyaura coupling and an aldol condensation cascade reaction.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/joceah/2012/joceah.2012.77.issue-19/jo301345a/production/images/medium/jo-2012-01345a_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jo301345a'>ACS Electronic Supporting Info</A></P>
Choi, Young Lok,Lim, Hye Sun,Lim, Hwan Jung,Heo, Jung-Nyoung American Chemical Society 2012 Organic letters Vol.14 No.19
<P>A one-pot transition-metal-free, base-mediated synthesis of dibenzo[<I>b</I>,<I>f</I>]oxepins was developed. The reaction of 2-halobenzaldehydes with (2-hydroxyphenyl)acetonitriles proceeds via a sequential aldol condensation and intramolecular ether formation reaction in the presence of Cs<SUB>2</SUB>CO<SUB>3</SUB> and molecular sieves in toluene.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/orlef7/2012/orlef7.2012.14.issue-19/ol302371s/production/images/medium/ol-2012-02371s_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ol302371s'>ACS Electronic Supporting Info</A></P>
Paenibacillus jamilae BRC15-1의 Cellulase 생산 최적화
차영록(Young-Lok Cha),윤영미(Young-Mi Yoon),윤하얀(Ha-Yan Yoon),김중곤(Jung Kon Kim),양지영(Ji-Young Yang),나한별(Han-Beur Na),안종웅(Jong-Woong Ahn),문윤호(Youn-Ho Moon),최인후(In-Hu Choi),유경단(Gyeong-Dan Yu),이지은(Ji-Eun Lee),안기 한국생물공학회 2015 KSBB Journal Vol.30 No.6
In this study was selected the cellulolytic microorganism and investigated optimum condition of cellulase production for the cellulosic bioethanol production. A bacterial strain Paenibacillus jamilae BRC15-1, was isolated from soil of domestic reclaimed land. For optimizing cellulase production from the selected strain, various culture parameters were investigated such as culture medium, pH (pH 4~10), temperature (25~50℃) and culture time (2~72 h). As a result, P. jamilae BRC15-1 efficiently produced cellulase from cellulosic biomass under following conditions: 24 h of culture time (pH 7, 40℃) in manufactured media of CMC (carboxymethyl cellulose) with peptone. Optimum saccharifying condition of crude enzyme produced from P. jamilae BRC15-1 was identified on pH 6 and 40℃ of reaction temperature, respectively. This crude enzyme from P. jamilae BRC15-1 was used for saccharification of pretreated sweet sorghum (Sorghum bicolor var. dulciusculum Ohwi) bagasse under the optimal condition. Finally, pretreated sweet sorghum bagasse including 0.1 g of glucan was saccharified by crude enzyme of P. jamilae BRC15-1 into 2.75 mg glucose, 0.79 mg xylose and 1.12 mg arabinose.
Cha, Young-Lok,Yang, Jungwoo,Ahn, Jong-Woong,Moon, Youn-Ho,Yoon, Young-Mi,Yu, Gyeong-Dan,An, Gi Hong,Choi, In-Hu Springer Berlin Heidelberg 2014 BIOPROCESS AND BIOSYSTEMS ENGINEERING Vol.37 No.9
<P>A CO<SUB>2</SUB>-added ammonia explosion pretreatment was performed for bioethanol production from rice straw. The pretreatment conditions, such as ammonia concentration, CO<SUB>2</SUB> loading level, residence time, and temperature were optimized using response surface methodology. The response for optimization was defined as the glucose conversion rate. The optimized pretreatment conditions resulting in maximal glucose yield (93.6 %) were determined as 14.3 % of ammonia concentration, 2.2 MPa of CO<SUB>2</SUB> loading level, 165.1 °C of temperature, and 69.8 min of residence time. Scanning electron microscopy analysis showed that pretreatment of rice straw strongly increased the surface area and pore size, thus increasing enzymatic accessibility for enzymatic saccharification. Finally, an ethanol yield of 97 % was achieved via simultaneous saccharification and fermentation. Thus, the present study suggests that CO<SUB>2</SUB>-added ammonia pretreatment is an appropriate process for bioethanol production from rice straw.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1007/s00449-014-1165-x) contains supplementary material, which is available to authorized users.</P>