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김정근,박해웅,장영철 한국기술교육대학교 2006 論文集 Vol.12 No.1
In the process of ingot pulling of the Si single crystal, the pulling velocity of the single crystal silicon should be faster than the dislocation propagation velocity in order to have uniform resistivity in (100) plane. The (100) plane has no dislocation when single crystal seed is contacted and seperated from the melt. Oxygen content of the Si ingot should be controlled by melting Si in Ar gas atmosphere with magnetic field to increase the viscosity of the melt. The efficiency of the Si wafer solar cell can be enhanced by (1) removing the defects in the Si wafer, (2) minimizing the recombination and thermalization of the atoms which lead to energy loss, (3) forming pyramid structure on the cell surface to reduce reflection of the light. The shading of the cell can be minimized via controlling of the finger width of the solar cell. the atoms which lead to energy loss, (3) forming pyramid structure on the cell surface to reduce reflection of the light. The shading of the cell can be minimized via controlling of the finger width of the solar cell.
Considering Cell-based Assays and Factors for Genome-wide High-content Functional Screening
Chung, Chul-Woong,Kim, In-Ki,Jung, Yong-Keun The Korean Society for Integrative Biology 2009 Animal cells and systems Vol.13 No.2
Recently, great advance is achieved in the field of genome-wide functional screening using cell-based assay. Here, we briefly introduce well-established and typical cell-based assays of GPCR and some parameters which should be considered for genome-wide functional screening. Because of characters and importance of GPCR as drug targets, several ways of assay systems were devised. Among them, high-content screening (HCS) that is based on the analysis of image by confocal microscope is becoming favorite choice. The advances in this technology have been driven exclusively by industry for their convenience. Now, it is turn for academy to define more detail signaling networks via HCS using cDNA or siRNA libraries at genome-wide level. By isolating novel signaling mediators using cDNA or siRNA library, and postulating them as new candidates for therapeutic target, more understanding about life science and more increased chances to develop therapeutics against human disease will be achieved.
정철웅(Chung, Chul-Woong) 역사학회 2013 역사학보 Vol.0 No.220
This is a book review on Prof. Kim Sung-woo’s The Transition of Regional Hegemony in Kyongsang-do during Chosun Dynasty: Yongnam Farming Method and Regional Development in Korea. This book deals with transformations of flatland into dry field and of mountainous areas into paddy field, both of which developed in Kyongsang-do during Chosun Dynasty, and consequent transition of regional hegemony, and relationship between Confucianism and agriculture. Besides, by adopting foreign scholars’ theories, it also intends to explain the characteristics of agricultural communities during that period. It seems to be a very challengeable approach for the book to analyze socio-economical factors in terms of transition of hegemony or a spatial-political method. I believe this is an effort to look into a local history in the macroscopic frame. His book is very noteworthy in that it daringly tries to combine the study of the meaning of farmers as a universal presence existing in any historical ages and the study of their roles in each of their own local communities. Another merit of this book is also to be found in that it makes possible a new synchronic debate on agriculture and farmers. However, I’d like to suggest that this book provide more diverse examples to more completely answer the questions of transformations of flatland into dry field and of mountainous areas into paddy field. Besides, it needs to more seriously investigate the possibility of applying the foreign scholars’ theories on farmers to actual historical realities.
Ok-Chul Chung,Hong-Gyu Kang,Tae-Woong Bae,Hyeon-Jin Sun,Jeong-Keun Choi,Pyung Ok Lim,Hyo-Yeon Lee 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07
Daily shedding pattern and longevity of pollen are important consideration for the evaluation of gene flow of transgenic plants. During the day, the pollen shedding pattern of zoysiagrass was determined in the lawn by using a device to collect airborne pollen on a glass slide, resulting that the pollen grains were released predominantly between 7:00 and 9:00. The result was also supported by in vitro pollen germination test, which was performed with pollens collected from 1:00 through 24:00 at 1h interval. Influence of temperature and humidity on pollen longevity was determined by germinating pollen at 25°C after incubating them for 10, 30, 60, and 180 min under different temperatures and humidity with pollen of zoysiagrass that opened freshly at about 9:00. The result showed that pollen longevity of zoysiagrass was sensitive to change of temperature and humidity and longest under the temperture and humidity of 15-20°C and 80-99%, respectively. Under natural conditions with the same method as upper controlled conditions, was determined pollen longevity. Under sunny atmospheric conditions, pollen longevity decreased to 20% in 60 min, with a complete extinction in 120 min. Under cloudy atmospheric conditions, pollen remained viable up to 450 min, with about 20% longevity after 360 min. No significant difference was found between GM and non-GM plants in their pollen longevity.