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윤제정 ( Je Jung Yun ),이재욱 ( Jae Wook Lee ),한은미 ( Eun Mi Han ) 조선대학교 공학기술연구원 2008 공학기술논문지 Vol.1 No.2
So far, as a electron donor Poly (3-hcxyl-thiophene) (P3HT) and acceptor [6,6]-phenyl-C61 butyric acid methyl ester (PCBM) are the best combination in the bulk heterojunction organic semiconducting solar cell. P3HT based organic solar cell has much attractive to offer important technological potential advances owing to its advantageous properties: electron rich, high charge carrier mobility, relatively small band gap (~2.l eV), relatively good thermal stability, soluble in organic solvent and etc. In this paper, photovoltaic effects are directly affected by the active layer thickness which proportional to the series resistance. Another characteristics are inverse portional to the shunt resistance, short circuit current and fill factor with increase of active layer thickness: 240 nm(1 wt%), 430 nm(2 wt%), 720 nm(3 wt%), 895 nm(4 wt%) and 1095 nm(5 wt%). Active layer were blended with P3HT and PCBM. The highest photon to current conversion efficiency was the one which active layer thickness was 240nm. These result could be driven that the optimum condition of high efficiency strongly related the limitation factors of absorption of photons and electron path as resistances.
임순호 ( Soon Ho Yim ),윤제정 ( Je Jung Yun ),강웅일 ( Ung Ii Kang ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.4
신생혈관은 일반적으로 성장과 상처 치유 과정에 포함되는 중요한 현상이다. 성장인자의 불균형이 이 과정에 포함되지만 악성안구 염증 질환 같은 여러 개의 질환을 야기한다. 경로를 방해하는 것을 통해 신생혈관을 억제하는 것은 이들 질병의 진행을 막는 참신한 방법론이다. 신생혈관에서 나노입자(Nanoparticles, 이하 NPs)의 기능과 기작은 현재까지 명료하게 밝혀지지 않았다. 본 연구서 NPs가 종양, 성장, 침습력과 전이에서 중추적인 단계인 신생혈관을 억제하는 능력을 가지고 있음을 확인하였다. NPs가 세포증식, 이주, 소망막내피세포(Bovine Retinal Endothelium Cell, 이하 BRECs)의 모세관 형성을 유도하는 혈관내피증식인자(Vascular endothelial growth factor, 이하 VEGF)를 억제할 수 있었다.
김경문 ( Kyung Moon Kim ),김선암 ( Sun Am Kim ),김홍기 ( Hong Gi Kim ),오병준 ( Byoung Jun Oh ),윤제정 ( Je Jung Yun ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.1
Biotech crops have been grown commercially for thirteen years since 1996. This paper describes current status and prospects of the biotech crops and the impact of plant biotechnology on the global agriculture from both economic and environmental perspectives. The 125 million hectares of biotech crops in 2008 by 25 countries represent 8% of the 1.5 billion hectares in the world. There have been net economic benefits at the farm level amounting to $44 billion for the thirteen-year period in both the developing countries and industrialized countries. During 1996-2007, the technology has accumulatively reduced agro-chemicals applying by 360 thousand tons and as a result, decreased the environmental impact associated with the use of agro-chemicals on these crops. In addition, deployment of biotech crops has also significantly reduced the release of 14.2 million tons of greenhouse gas emissions from cropping area. Biotech crops has been used as bioenergy crops for the production of biofuels and as bioreactors for the production of the food/feed ingredients in tile nutrient level as well as biopharmaceuticals. Biotech crops have been mostly issued in the public, thus, need for appropriate regulatory systems that are responsible and rigorous.