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정병균(Byung-kyun Jung),이진종(Jin-Jong Lee),정병호(Byeong-Ho Jeong) 대한전기학회 2009 전기학회논문지 P Vol.58 No.4
A number of factors combine to make ultraviolet radiation a superior means of water purification for ground water, rainwater harvesting systems and so on. Ultraviolet radiation is capable of destroying all types of bacteria. Additionally, ultraviolet radiation disinfects rapidly without the use of heat or chemical additives which may undesirably alter the composition of water. In a typical operation, water enters the inlet of a UV lamp and flows through the annular space between the quartz sleeve and the outside chamber wall. The irradiated water leaves through the outlet nozzle. Several design features are combined to determine the dosage delivered. The first is Wavelength output of the lamp, the Second is Length of the lamp - when the lamp is mounted parallel to the direction of water flow, the exposure time is proportional to the length of the lamp, the third is Design water flow rate - exposure time is inversely related to the linear flow rate, the forth is Diameter of the purification chamber - since the water itself absorbs UV energy, the delivered dosage diminishes logarithmically with the distance from the lamp. In this paper, It describe the how to design optimal UV disinfection device for ground water and rainwater. To search the optimal design method, it was performed computer simulation with 3D-CFD discrete ordinates model and manufactured prototype. Using proposed design method manufactured prototype applied to disinfection test and proved satisfied performance.
곡물류의 형질전환 유도에 관한 연구 (4) - 벼 배발생 세포의 생화학적 특징
정병균(Byung Kyun Jung),송정원(Jeong Won Song),임형탁(Hyoung Tak Im),남백희(Baek Hie Nahm),황백(Baik Hwang) 한국식물학회 1993 Journal of Plant Biology Vol.36 No.4
Rice (Oryza sativa L.) calli containing both embryogenic callus (EC) and nonembryogenic callus (NEC) regions were initiated from the mature seed on MS medium supplemented with 2.0 mg/L 2,4-D, 0.5 mg/L kinetin. The calli were developed into two callus type which can be distinguished by visual examination depending on color and appearance. In order to illucidate the polypeptide composition between EC and NEC, the total protein extracted from two types of callus was analysed by electrophoresis. By one-dimesional analysis of SDS-PAGE and Isoelectric focusing, several protein bands showed quantitative and qualitative difference in each type of callus. The further analysis of the total protein with two-dimensional electrophoresis showed at least 20 EC specific protein and 10 NE specific protein. Also 3 specific protein spots showing microheterogeneity of 90, 65, 50 kD were detected in EC, while a series of acidic heterologous protein spots were visualized in NEC.
곡물류의 형질전환 유도에 관한 연구 V. Electroporation에 의한 밀의 형질전환
송정원,정병균,배동규,임형탁,남백희,정현숙,황백,Song, Jung-Won,Jung, Byung-Kyun,Bae, Dong-Kyu,Im, Hyung-Tak,Nam, Back-Hee,Jung, Hyun-Sook,Hwang, Baek 한국식물생명공학회 1994 식물생명공학회지 Vol.21 No.4
밀의 조직절편을 직접 유전자 전이에 의해서 형질전환시켰다. 기계적으로 잘려진 뿌리조직 절편은 pBl 121 plasmid DNA와 electroporation 방법으로 형질전환시켰으며 300mg/L kanamycin을 함유하는 MS 배지에서 배양하였다. 형질전환된 캘러스는 배양한 지 5-7일이내에 개시되었으며 4주 후 선발되었다. 형질전환 효율의 최적수준은 200 V/ 800uF이었으며 2.5%로 형성되었다. GUS 분석과 southern 분석은 뿌리절편과 절편유래 캘러스로부터 외래유전자의 발현과 안정한 형질전환이 이루어졌음을 보여주었다. Wheat (Triticum aestium L.cv Cho-Kwang) explants were transformed by electrporation. Excised root segments were elechoporated with plasmid DNA of pBI121 and transferred to medium containing 300 mg/L kanamycin. Transformed calli formed within 5-7 days of culture and were selected from electroporated tissue on medium containing kanamycin after 4 weeks. The highest transformation frequency was obtained after electroporation with a pulse of 200 V/800 uF and calli formed at frequencies up to 2.5%. GUS ($\beta$-glucuronidase) assay and dot blot analysis showed that the foreign gene was capable of expressing in root explants subjected to electroporation and calli derived from the explants..
정병균 서강전문대학 2000 산업과학연구 Vol.2 No.-
Both embryogenic(EC) and nonembryogenic calli(NEC) derived from the matured seed embryo of rice (Oryza sativa L. cv Donggin) were analyzed for differences in their gene expression. Two partial cDNA of an embryogenic cell specific gene was cloned by differential display of amplified cDNAs using a 12-mers synthetic nucleotide as a single primer. The expression of these clones, designated as REC1 and REC2, respectively, was confirmed by northern blot analysis that high levels expression only in the embryogenic cells. The 250 base of the cDNA clone REC1 have no homology with known genes. The cDNA nucleotide sequenced of the clone REC2 which is 649 base in length, was identified as a partial sequence of genes in Alcaligenes eutrophus. The partial amino acid sequence deduced from the clone REC2 showed 75 to 82 % homology with cobalt-nickel resistant proteins of Alcaligenes eutrophus.