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송재용(Jae Yong Song),변태강(Tae Gang Byun),김범수(Beom Soo Kim) 한국생물공학회 2012 KSBB Journal Vol.27 No.3
When iron oxide magnetic nanoparticles were synthesized by co-precipitation method using aqueous ammonia as reducing agent, the synthesized particles were aggregated and thus precipitation occurred. Using Magnolia kobus leaf extract as reducing agent, spherical nanoparticles of 50~200 nm were synthesized with low yield. By using both Magnolia kobus leaf extract and aqueous ammonia as reducing and stabilizing agents, smaller nanoparticles of 40~120 nm could be synthesized with various shapes. The synthesized magnetic nanoparticles were characterized with field emission transmission electron microscopy (FE-TEM) and scanning electron microscopy (SEM). TEM and SEM images showed that the magnetic nanoparticles are a mixture of triangles, tetragons, rods and spherical structures.
Aniline Terminated Waterborne Polyurethane과 PEDOT/PSS의 블렌딩에 의한 대전방지 코팅용액의 제조
홍민기 ( Min Gi Hong ),허우영 ( Woo Young Huh ),변태강 ( Tae Gang Byun ),송기창 ( Ki Chang Song ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.4
Polyurethane prepolymers were prepared from poly (carbonate diol), isophrone diisocyanate and dimethylol propionic acid. Then, aniline terminated waterborne polyurethane dispersion (ATPUD) was synthesized by capping the NCO group of the prepolymer with aniline monomer. Subsequently, ATPUD and waterborne polyurethane dispersion (PUD), respectively, were blended with conducting polymer, poly (3,4-ethylenedioxythiophene)/polystyrene sulfonate [PEDOT/PSS], to yield antistatic coating solutions, and the mixture was coated on the polycarbonate substrates. At adequate addition amounts of PEDOT/PSS less than or equal to 2.5 g, the surface resistances (1.0×1011~2.5×108 Ω/ cm2) of coating films from ATPUD showed better electronic conductivities than those (5.0×1011~6.3×109 Ω/cm2) from PUD. However, at excess amount of PEDOT/PSS of 3.0 g, the surface resistance from ATPUD showed similar electronic conductivity with that from PUD.
Hydroxyethyl Methacrylate와 Methyl Methacrylate의 첨가량 변화가 수분산 폴리우레탄-아크릴 혼성 용액의 물성에 미치는 영향
김병석 ( Byung Suk Kim ),유병원 ( Byung Won Yoo ),이명구 ( Myung Goo Lee ),변태강 ( Tae Gang Byun ),송기창 ( Ki Chang Song ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.4
Waterborne polyurethane dispersions (PUD) were synthesized from isophorone diisocyanate (IPDI), polycarbonate diol (PCD) and dimethylol propionic acid (DMPA) as starting materials. Subsequently, waterborne polyurethane- acrylic hybrid solutions were prepared by reacting the PUD with different amounts of the mixture of acrylate monomers, HEMA (2-hydroxyethyl methacrylate) and MMA (methyl methacrylate). As a result, the average particle size of waterborne polyurethane-acrylic hybrid solutions was increased with increasing the addition amounts of acrylate monomers. Also, the prepared coating films from waterborne polyurethane-acrylic hybrid solutions showed better abrasion resistance and chemical resistance than those of pure PUD.
Aminopropyl Triethoxysilane과 아크릴 단량체를 이용한 Silylated Acrylic Polyurethane Dispersion의 제조
김병석 ( Byung Suk Kim ),윤동구 ( Dong Gu Yun ),유병원 ( Byung Won Yoo ),이명구 ( Myung Goo Lee ),변태강 ( Tae Gang Byun ),송기창 ( Ki Chang Song ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.4
Waterborne polyurethane dispersion (PUD) was synthesized by capping the NCO groups of polyurethane prepolymers, prepared from isophorone diisocyanate, polycarbonate diol and dimethylol propionic acid, with aminopropyl triethoxysilane (APS), Subsequently, silylated acrylic polyurethane dispersion was synthesized by reacting the PUD with the mixture of acrylate monomers, 2-hydroxyethyl methacrylate and methyl methacrylate, The average particle size of silylated acrylic polyurethane dispersion, measured by the dynamic light scattering method, was increased from 39.0 nm to 399.8 nm by increasing the addition amounts of APS. Also, the pencil hardness of coating films of silylated acrylic polyurethane dispersion was enhanced from B grade to F grade with increasing APS content.
차성한 ( Seong Han Cha ),인명원 ( Myeong Won Ahn ),이정식 ( Jung Shik Lee ),김영숙 ( Young Suk Kim ),김동욱 ( Dong Uk Kim ),변태강 ( Tae Gang Byun ),박권필 ( Kwon Pil Park ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.4
Properties of fucoidan used for functional cosmetic ingredients and the effect of fucoidan molecular weight on the cosmetic functions were studied. Fucoidan was extracted from Undaria pinnatifida sporophylls and molecular weight (35~160kDa) of fucoidan was controlled by contact glow discharge electrolysis (CGDE). To test possibility of fucoidan as a cosmetics material, tyrosinase inhibition property, water-holding property, elastase activity inhibition property and DPPH free radical scavenging property were measured. Water-holding property of fucoidan was higher than that of hyaruronic acid, which is known as the one of the best water-holding material. The water-holding strength of fucoidan slightly increase as molecular weight of fucoidan decrease, Elastase activity inhibition (anti wrinkle effect) of fucoidan was higher than that of adenosine using standard material for anti wrinkle test. Optimum molecular weight of fucoidan to obtain highest tyrosin inhibition effect, elastase inhibition effect and radical scavenger effect is 100kDa.
배양액 혼합상태가 미생물 대사와 2,3-butanediol 생산성에 미치는 영향
변태강 建陽大學校 1996 建陽論叢 Vol.- No.4
2,3-butanediol 생산에 사용된 균주 (E. aerogenes)는 산소에 예민하게 반응하므로 reactor 내의 hydrodynamics (mixing) 과 물질전달 (특히 산소전달) 기작에 영향을 받는다. 발효조의 종류와 교반상태가 혼합에 영향을 주며 혼합이 불충분한 경우 조내의 국부적인 산소농도 차이를 가져오게 된다. 이 결과 미생물 대사에 영향을 미쳐 부산물인 ethanol의 농도가 증가되고 생산성이 저하된다.
버섯 균사체의 심부배양에 의한 버섯향료 생산을 위한 우수 균주의 선별
변태강 建陽大學校 1999 建陽論叢 Vol.- No.7
Recently, there is a tendency to replace synthetic flavors by natural ones. This trend can be ascribed to increasing health and nutrition conscious life-styles. The term 'natural flavor' includes enzymic and fermentative processes. Edible mushrooms are known for their unique and subtle flavor characteristics and have wide application as a food flavoring additive in the production of soups, sauces and instant products. 1-octen-3-ol is the main chemical responsible for the mushroom flavor. Submerged culture of mushroom mycelium is a faster and more easily controllable method than the established growth of fruiting bodies by solid-state fermentation. Although a number of mushrooms give good yields of mycelium biomass in submerged culture, a satisfactory flavor has been found in only a few cases. Among the nine strains tested, Agaricus bisporus 705 showed the greatest production of mushroom flavor.
Agaricus bisporus 705 균사체 배양에 의한 1-octen-3-o1 생산에 있어 생물반응기 종류의 영향
변태강 建陽大學校 2000 建陽論叢 Vol.- No.8
In airlift fermentor the effects of aeration rate and mycelium morphology on the productivity of 1-octen-3-ol was investigated in the submerged culture of Agaricus bisporus 705. Maximum 1-octen-3-ol concentration was obtained when aeration rate was 1.0vvm. The performance of airlift fermentor is compared with that of stirred tank. Air circulation in airlift fermentor causes less fragmentation of the mushroom mycelia than the mechanical agitation in stirred tank. The high 1-octen-3-ol concentration(840μg/L) was obtained, which was more than 2 times higher than that of culture in stirred fermentor.