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탄소섬유시트를 사용한 고강도 콘크리트 구조물의 보강에 관한 연구
곽계환,박종건,석인수 원광대학교 2001 論文集 Vol.27 No.-
In recent years the research and development about the new material proceeds rabidly and actively in the building industry. As building structures become biger, higher and more soecialized, so does the demand for material with higher strength. The repair of initially leaded high-strength reinforced concrete structures using carbo fiber sheet(CFS) was investigated experimentally. The test results indicate that CFS is is very effective for strengthening the damaged structures and controlling deflections of the repaired structures. When carbon fiber sheet rehabilitation of high strength concrete structures haven diagonal crack the increase in the number of CFS layers didn,t effect the increase in the strength of concrete.
곽영기,윤순동,박종환 木浦海洋大學校 1999 論文集 Vol.7 No.1
Mokpo area has natural advantages for ship building and good Infra-Structure such as railroad, harbor(construction of a new output), the west coast highwasy, Muan international airport nearby. This good Infra-Structure will enable Mokpo a nucleus city of the distribution industry in the Yellow sea rimland with the steady increasing trade with China and this will stimulate the shipping industry to leads to a demand for ships. To prepare for this need, the analysis of the international shipbuilding market conditions and the investigation of the present state of domestic and Mokpo area's shipbuilding industry are performed ahead of the futre growth plan of Mokpo area's shipbuilding industry. In this study, by examining the state of small and midium sized shipbuilding yards in Japan, the problems and the solutions of those in Korea is clearly found. Moreover, the problems are listed and th counterplans of ship production technique which the small and medium sized shipbuilding yards have in common in Korea and the manpower supply plan in Mokpo area are suggested. Under the aim of having small and medium sized shipbuiling yards which have the strenthened competitiveness and a sound base of the shipping and distribution industry in the near future, the action plans are proposed and the direction of the future growth study are presented.
Kwak, Jae-Hwan,NamGoong, Kwon,Jung, Jae-Kyung,Han, Sang-Bae,Cho, Jung-Sook,Kim, Hwan-Mook,Park, Song-Gyu,Lee, Ki-Ho,Kang, Jong-Soon,Lee, Hee-Soon 대한약학회 2010 Archives of Pharmacal Research Vol.33 No.5
A series of 2-alkyl-2,3-dihydro-1H-2,6-diazacyclopenta[b]anthracene-5,10-diones (4a-f) was synthesized and their in vitro cytotoxic activities were evaluated against six human cancer cell lines (HCT15, SK-OV-3, SNB19, A549, MCF7 and MCF7/ADR). They all appeared to be less potent than doxorubicin against all doxorubicin sensitive human cancer cell lines tested. However, these compounds retained considerable cytotoxic activity against the doxorubicinresistant cell line MCF7/ADR, implying their therapeutic potential to treat doxorubicin-resistant tumors. The most active compound 4c was equipotent with doxorubicin against HCT15 cell line.
Kwak, Jong Hwan,He, Yanxia,Yoon, Byungkwon,Koo, Seyoung,Yang, Zhigang,Kang, Eun Ju,Lee, Bong Ho,Han, Seung-Yun,Yoo, Yung Choon,Lee, Kyung Bok,Kim, Jong Seung The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.86
<P>Rhodamine-labelled dieckol (<B>1</B>) synthesized through a click reaction was found to be localized in the endoplasmic reticulum (ER) of RAW 264.7 cells. Anti-inflammatory activity of compound <B>1</B> was considerably greater than that of dieckol itself.</P> <P>Graphic Abstract</P><P>Rhodamine-labelled dieckol localized in the ER of RAW cells. Anti-inflammatory activity of the compound was greater than that of dieckol. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc04270k'> </P>
강섬유 혼입 폴리머 시멘트 고강도 콘크리트 보의 전단거동
곽계환 ( Kwak Kae Hwan ),박종건 ( Park Jong Gun ),곽경헌 ( Kwak Kyung Hern ) 한국농공학회 2002 韓國農工學會誌 : 전원과 자원 Vol.44 No.1
Steel fiber and polymer are used widely for reinforcement material of RC structures because of its excellences of the durability, serviceability as well as mechanical properties. The purpose of this study is to investigate the shear behavior of polymer cement high strength concrete beams mixed with steel fiber. The compressive strength of concrete was based on the 100×200 mm cylinder specimens. The compressive strength of concrete are 320 kgf/㎠, 436 kgf/㎠ and 520 kgf/㎠ in the 28 days. The static test was carried out to measure the ultimate load, the initial load of flexural and diagonal cracking, crack patterns and fracture modes. Also, load-strain and load-deflection examined. During the test cracks were sketched against the load values according to the growth of crack. Result are as follows; (1) The failure modes of the specimens are increased in rigidity and durability with mixing steel fiber and polymer. (2) The load of initial crack was similar a theory of shear-crack strength. (3) The deflection and strain at failure load of Polymer-steel fiber high strength concrete beams were increased, improving the brittleness of the high strength concrete.
곽계환,박종건,곽광옥 圓光大學校大學院 1991 論文集 Vol.8 No.-
The sutdy found that so far, our nations current standard Code for Reinforced Concrete design consist of two conventional desingn part, so called WSD and USD, which are based on ACI 318-83 or 318-89 Code provisions. Thus, design criteria of our WSD and USD which are taken from ACI Code standard are proved to be not appropriate compared to our country construction practices. On top of that, even the ACI safety rate are not determined from probabilistic study but merely from experiences and practicalitys. Therefore, in order to design of economical and rational and reliablity purpose to do investigates on the problems of sheardesign by comparing as numerical analysis on computer method of the difference of reinforced concrete bending beam in WSD between the present projects of Korean society of Engineers and a serious of experiments.
<i>In vitro</i> 3D skin model using gelatin methacrylate hydrogel
Kwak, Bong Shin,Choi, Wonho,Jeon, Joong-won,Won, Jong-In,Sung, Gun Yong,Kim, Bumsang,Sung, Jong Hwan Elsevier 2018 Journal of industrial and engineering chemistry Vol.66 No.-
<P><B>Abstract</B></P> <P>Interests in <I>in vitro</I> skin models have been growing. Collagen, which is a main scaffold material for in vitro 3D skin models, has weak mechanical properties, often resulting in undesirable contraction. The physiological characteristics of the skin models often depend on the matrix in which cells are cultured. In this study, we developed a 3D skin model using gelatin methacrylate. The mechanical and transport properties were studied, and attachment and growth of fibroblasts and keratinocytes were examined. Fibroblasts preferred softer matrix, whereas HaCaT cells preferred harder matrix of gelatin methacrylate. This study provides information for developing <I>in vitro</I> skin models.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>