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Lithium Ion Polymer Electrolyte Based on Poly(ethylene oxide)와 Poly(vinyl chloride)
류광경 선문대학교 중소기업기술지원연구소 1997 선문공대 연구/기술 논문집 Vol.2 No.1
The level of awareness and actual implementation of integration and computerization in the construction industry is growing. However, it is not clear at this point how to assess the extent of their impact and to identify in which ways they better support the construction projects related to their success. The objectives of this research are the development of a model to evaluate the impact of integration and computerization on construction projects and the recommendation of guidelines for companies in identifying suitable ways for them to incorporate integration and computerization into their operation. The developed conceptual model has been found robust enough to be used as a benchmarking tool in evaluating the performance of the construction process and to strategize its future operation.
PAN-PVDF-PEGME Blend계 고분자전해질의 전기화학적 특성
류광선,이계중,류광경,강성구,장순호,Ryu, Kwang Sun,Lee, Gye Joong,Liou, Kwang Kyoung,Kang, Seong Gu,Chang, Soon Ho 대한화학회 1999 대한화학회지 Vol.43 No.2
PAN-PVDF-PEGME 블랜드(blend)계의 고분자전해질을 만들어 전기화학적인 특성을 조사하였으며 PEGME의 첨가에 따른 물성변화를 측정하였다. PEGME가 첨가되면서 PVDF의 결정성은 감소하고, 이온 전도도는 대부분 $∼10^{-3}S/cm$의 이온전도도를 나타내므로 고분자전해질로 사용이 가능하다. 또한 이온전도도의 온도의존성으로부터 PEGME의 첨가양이 증가할수록 효과적으로 높은 이온전도도를 갖는 통로가 생겨 이온전도도가 증가하는 것으로 예상할 수 있다. SPE 2(10 wt% PEGME)에서 가장 큰 양이온 수율을 나타내고 있으며 PEGME의 양이 증가할 수록 감소하는 것을 알 수 있다. PEGME를 첨가하지 않은 SPE 1(PAN-PVDF계) 고분자전해질의 전기화학적으로 안정한 영역은 ∼4.3 V인 반면에 PEGME를 첨가한 SPE 2-4(PAN-PVDF-PEGME계) 고분자전해질은 ∼4.6 V까지 전기화학적으로 안정한 것을 알 수 있다. 또한 이 고분자전해질을 사용하여 전지를 구성하여 충방전 성능을 비교하여 보면 PEGME를 첨가함에 따라 방전 용량이 증가함을 알 수 있다. 즉 PEGME를 첨가함에 따라 이온전도도가 증대되며, 전기화학적으로 안정한 영역이 넓어질뿐만 아니라 전지구성시 방전 성능도 향상됨을 알 수 있다. The electrochemical properties of PAN-PVDF-PEGME blend polymer electrolyte system are investigated and the physical properties are also measured with varying the content of PEGME. This PEGME partially reduces the crystallinity of PVDF. The ionic conductivities of the polymer electrolytes are about $10^{-3}S/cm$, which may be applicable to a constituent of lithium secondary battery. From the temperature dependence of ionic conductivity, it is suggested that the ionic conductivity increases with the PEGME content due to the fomation of effective ion-conducting path. The cation transference number reaches its maximum value for the electrolytes (SPE 2) with 10 wt% PEGME and then decreases for further increase of PEGME contnet. The electrochemically stable range of SPE 1 (without PEGME) is about 4.3 V, but SPE 2-4 (PAN-PVDF-PEGME system) is about 4.6 V. When these polymer electrolyte are used as electrolyte in rechargeable battery and the cell performances are tested, the discharge capacity increses with the amount of PEGME. Therefore, PEGME increases the ionic conductivity, extends the electrochemical stable range, and finally improves the discharge capacity of cell adopting the electrolyte system.
Gopal Prasad Ghimire,오태진,류광경,송재경 한국분자세포생물학회 2008 Molecules and cells Vol.26 No.4
We identified a 1,134-bp putative type III polyketide synthase from the sequence analysis of Streptomyces peucetius ATCC 27952, named Sp-RppA, which is characterized as 1,3,6,8-tetrahydroxynaphthalene synthase and shares 33% identity with SCO1206 from S. coelicolor A3(2) and 32% identity with RppA from S. griseus. The 1,3,6,8-tetrahydrox-ynaphthalene synthase is known to catalyze the sequential decarboxylative condensation, intramolecular cyclization, and aromatization of an oligoketide derived from five units of malonyl-CoA to give 1,3,6,8-tetrahydroxynaphthalene, which spontaneously oxidizes to form 2,5,7-trihydroxy-1,4-naphthoquinone (flaviolin). In this study, we report the in vivo expression and in vitro synthesis of flaviolin from purified gene product (Sp-RppA).
Streptomyces sp GCA0001로부터 Cystocin의 생산 및 분리 정제
김동현,이희찬,우진석,송재경,류광경,김대희,강선엽 호서대학교 반도체제조장비국산화연구센터 2001 반도체장비학술심포지움 Vol.2001 No.-
Cystocin을 생산하는 Streptomyces sp GCA0001균주를 screenig하였으며, Streptomyces sp GCAO001를 배양하고 분리정제를 통하여 흰색 분말의 Cystocin을 얻을 수 있었다.Cystocin은 Streptomyces alboniger에서 생산되는 Puromycin과 매우 유사한 구조의 항생물질로 확인되었다.Cystocin은 Puromycin과 마찬가지로 단백질 합성시 폴리펩티드 사슬의 elongation을 조기 종결함으로써 생체내에서 항박테리아, 항종양 및 항바이러스 활성을 나타낸다. Cystocin is identified from the screening of Streptomyces sp GCAO001.It is isolated from the culture of Streptomyces sp GCAO001.A white coloured cystocin is structurally similar to puroinycin, an antibiotic produced by streptomyces alboniger.Like puromycin, cystocin possesses an antibacterial, antitumour and antiviral activity.It impairs the protein synthesis by inhibiting polypeptide chain elongation.