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차준용,이정민,모상영,이재달,배기서,홍영기 忠南大學校 産業技術硏究所 1996 산업기술연구논문집 Vol.11 No.2
Fiber-reinforced composite materials are used in a wide variety of applications in the advanced field of industries such as electric clutch, motor, car, space and aviation etc. It is well known that the brake lining made of fiber-reinforced composites show excellent friction and wear properties compared to the conventional asbestos brakes and also are known to have high absorption energy and excellent high temperature properties in braking. In order to endow high friction and wear stability to the commercial brake lining, the waste fiber such as cotton, PAN, PET, nylon,kevlar, glass and it's binary mixture fibers were used the fiber reinforcements. The fiber/phenolic resin system has been carried out by preform molding method. The friction tester was especially designed and prepared for evaluation of frictional properties such as friction coefficient and stability. The physical properties of fiber reinforced composites were investigated in terms of the 3-point bending strength, the properties of friction, and morphology. The results obtained from the work are as follows ; 1. The friction properties of the cotton fiber reinforced composites were similar to those of the commercial brake linings, but in the cases of reinforcement of kevlar, glass. we can improve those properties, 2. The proper amount of organic and inorganic fiber mixtures can improve the properties of friction and the mechanical properties, 3. It is more desirable to manufacture hybrid fiber reinforced composites because single cotton or synthetic fiber reinforced composites aren't improved frictional properties, and 4. On evaluating frictional properties of waste fiber reinforced composites, frictional properties of waste fiber reinforced composites are superior to commercial disc lining. Therefore we can confirm practical possibility of waste fiber reinforced disc lining.
차달관,임준홍 한양대학교 공학기술연구소 1993 공학기술논문집 Vol.2 No.1
A survey on modeling and analysis methods of discrete event dynamic systems(DEDSs) is performed. The notion of stability in DEDS is introduced and the control method, which can stabilize the system, is presented. The modeling of DEDS and the notion of stability are being studied in various methods. We introduce the linguistic approach in which the dynamics are modelled by state transition and the language is defined in the event set. The state-based approach in which the notion of system state is defined and the stability of the system is analysed. Also, we show that this mndeling method and stability analysis can be applicable to the real manufacturing system.
章基弘,宋承達,鄭濬,楊洪準,李永吉 慶北大學校 自然科學大學 1982 自然科學論文集 Vol.1 No.-
The flora of Tsushima Islands consists of total 250 species. The major natural forests are coastal shrub forest, low-land forests, mountain forests, secondary forests, and planted forests. The vegetation maps of Tsushima Islands are similar to those of Jeju Islands, Ulreung Islands and the South-coastal districts of Korean Peninsula. The fresh water algae of Korea listed total 8 classes, 20 orders, 47 families, 122 genera and 618 kinds (including 459 species, 1 subspecies and 31 kinds). The fauna of fresh water fishes comprises 25 families, 83 genera, and 132 species in South Korea and 9 families, 20 genera and 22 species in Tsushima Islands, respectively. The Late 0ligocene sedimentation recorded in the Taishu Group reveals an unstable shallow marine depositional environment as shown in sole marks and other sedimentary features. Previous studies on directional features of the Taishu Group have shown that the Paleo-Tsushima Strait and the East Sea originated during the Taishu sedimentation. The provenances of the Taishu Group appear to be the Korean Peninsula and the Early Paleogene sedimentary rocks of Yellow Sea floor and the sea floor between Yellow Sea and the Tsushima Island. The Early Miocene uplift and folding of the Taishu Group must have closed the Paleo-Tsushima Strait connecting Korea and the Japanese Islands. According to previous studies, the Korean Peninsula and the Japanese Islands were connected during the end of the Miocene and the Late Pleistocene. The last isolation commenced during the Riss-Wu¨rm Interglacial age.
Hong, Su-Myeong,Kwon, Oh-Kyung,Choi, Dal-Soon,Kim, Jin-Hyo,Choi, Geun-Hyoung,Cho, Nam-Jun The Korean Society for Applied Biological Chemistr 2014 Applied Biological Chemistry (Appl Biol Chem) Vol.57 No.3
The objective of this study was to analyze mycotoxin contents in Korean barley and wheat infected with Fusarium sp. The major contaminant was determine among deoxynivalenol, nivalenol (NIV), and zearalenone, as well as diminution rate of mycotoxin contents by milling, washing, and boiling processes. NIV was found as a major mycotoxin contaminant in Korean barley and wheat, and bran showed higher contamination level than the inner part in whole infected cereal. The results indicate that the milling process of the diseased barley and wheat showed dramatic diminution rate of 84.4%. Furthermore, the washing on barley reduced mycotoxin infection up to 81.0%, and boiling showed 82.7% diminution effect.
형질전환 벼 현탁세포 배양에서 hCTLA4Ig의 in situ 회수
최홍열(Hong-Yeol Choi),전수환(Su-Hwan Cheon),권준영(Jun-Young Kwon),윤보름(Boreum Yun),홍석미(Seok-Mi Hong),김선달(Sun-Dal Kim),김동일(Dong-Il Kim) 한국생물공학회 2016 KSBB Journal Vol.31 No.4
In this research, recombinant human cytotoxic Tlymphocyte antigen 4-immunoglobulin (hCTLA4Ig) was produced by transgenic rice cells. RAmy3D promoter was used for overcome the limitation of low expression level in transgenic plant cells, and the secretion of target protein was accomplished by signal peptide. However, the RAmy3D promoter system which can be induced only by sugar starvation causes the decrease of cell viability. As a result, cell death promotes the release of protease which degrades the target proteins. The protein stability and productivity can be significantly influenced by proteolysis activity. Therefore, development of new strategies are necessary for the in situ recovery of target proteins from cell culture media. In this study, in situ recovery was performed by various strategies. Direct addition of Protein A resin with nylon bag leads to cell death by increased shear stress and decrease in production of hCTLA4Ig by protease. Medium exchange through modified flask could recover hCTLA4Ig with high cell viability and low protease activity, on the other hand, the productivity was lower than that of control. When in situ recovery was conducted at day 7 after induction in air-lift bioreactor, 1.94-fold of hCTLA4Ig could be recovered compared to control culture without in situ recovery. Consequently, in situ recovery of hCTLA4Ig from transgenic rice cell culture could enhance productivity significantly and prevent degradation of target proteins effectively.