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- 저자 : 김우진(Woo Jin Kim) (검색결과 311 건)
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고온초전도 직류 케이블용 절연재료인 PPLP의 직류 및 임펄스 절연 특성
김우진,방만식,김해종,조전욱,김상현,Kim, Woo-Jin,Pang, Man-Sik,Kim, Hae-Jong,Cho, Jeon-Wook,Kim, Sang-Hyun 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.7
To realize the high-Tc superconducting (HTS) DC cable system, it is important to study not only high current capacity and low loss of conductor but also optimum electrical insulation at cryogenic temperature. A model HTS DC cable system consists of a HTS conductor, semi-conductor, cooling system and insulating materials. Polypropylene laminated paper (PPLP) has been widely adopted as insulating material for HTS machines. However, the fundamental insulation characteristics of PPLP for the development of HTS DC cable have not been revealed satisfactorily until now. In this paper, we will discuss mainly on the breakdown characteristics of 3 sheets PPLP in liquid nitrogen ($LN_2$). The characteristics of the diameter, location of butt-gap, distance between butt-gap length, pressure effect, polarity effect under DC and impulse voltage were studied. Also, the DC polarity reversal breakdown voltage of mini-model cable was measured in $LN_2$ under 0.4 MPa.
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Genetic Relationships of Four Korean Oysters Based on RAPD and Nuclear rDNA ITS Sequence Analyses
김우진,이정호,김경길,김영옥,남보희,공희정,정현택,Kim, Woo-Jin,Lee, Jeong-Ho,Kim, Kyung-Kil,Kim, Young-Ok,Nam, Bo-Hye,Kong, Hee-Jeong,Jung, Hyung-Taek The Malacological Society of Korea 2009 The Korean Journal of Malacology Vol.25 No.1
Random amplified polymorphic DNA (RAPD) marker and sequence analyses of the internal transcribed spacer (ITS) region of ribosomal DNA were used to assess phylogenetic relationships of four Korean oyster species. The average number of species-specific markers identified from five universal rice primers (URPs) by RAPD-PCR was 1.8 for Crassostrea gigas, 3.2 for C. nippona, 3.6 for C. ariakensis, and 4.6 for Ostrea denselamellosa. The length of the ITS (ITS1-5.8S-ITS2) region ranged from 1,001 to 1,206 bp (ITS1, 426-518 bp; 5.8S, 157 bp; and ITS2, 418-536 bp), while the GC content ranged from 55.5-61.1% (ITS1, 56.8-61.8%; 5.8S, 56-57.3%; and ITS2, 54.1-62.2%). A phylogenetic analysis of the oysters based on our RAPD, ITS1, and ITS2 sequence data revealed a close relationship between C. gigas and C. nippona and a distant relationship between the genera Crassostrea and Ostrea. Our results indicated that RAPD and ITS sequence analysis was a useful tool for the elucidation of phylogenetic relationships and for the selection of species-specific markers in Korean oysters.
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김우진,김준수,김명준,이진영,신선명,Kim, Woo Jin,Kim, Joon Soo,Kim, Myong Jun,Tran, Tam,Lee, Jin-Young,Shin, Shun-Myung 한국자원리싸이클링학회 2016 자원리싸이클링 Vol.25 No.5
본 연구는 호주산 저품위 동광의 선광실험결과로 얻은 고품위 광물의 황산화 배소 및 선택적 침출반응 조건 확립을 통해 유가 광물 중에 함유된 성분을 선별적으로 용해해냄으로써 철 성분을 비롯한 불순물을 줄이거나, 동 및 니켈 성분을 용해 혹은 잔사에 잔류시킴으로써 유가금속회수를 효과적으로 회수하고자 하는데 목적이 있다. 본 연구실험결과 얻은 최적조건은 황산화 배소시 $450^{\circ}C$, $Na_2SO_4$ 2 mole ratio 및 1.5 h이었고, 배소산물의 침출온도는 상온 및 침출제는 $H_2O$ 혹은 1M $H_2SO_4$이었다. 최적조건 하에서 Cu 성분은 90 wt.% 침출율을 Fe성분은 20 wt.%내외, Ni성분은 15 wt.% 정도를 나타내는 것으로 보아 선택적 분해침출이 가능하다.
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Ti 첨가강의 Ti와 C 함량에 따른 초기 오스테나이트 입도 변화
김우진,강남현,도형협,김성주,남대근,조경목,Kim, Woo-Jin,Kang, Nam-Hyun,Kim, Sung-Ju,Do, Hyung-Hyup,Nam, Dae-Geun,Cho, Kyung-Mox 한국재료학회 2011 한국재료학회지 Vol.21 No.4
Prior austenite grain size plays an important role in the production of high strength hot-rolled steel. This study investigated the effect of Ti and C contents on the precipitates and prior austenite grain size. Steel with no Ti solutes had prior austenite grain size of about 620 ${\mu}m$. The addition of Ti ~ 0.03 wt.% and 0.11 wt.% reduced the prior austenite grain size to 180 ${\mu}m$ and 120 ${\mu}m$, respectively. The amount of Ti required to significantly decrease the prior austenite grain size was in the range of 0.03 wt.%. However, the amount of carbon required to significantly decrease the prior austenite grain size was not present from 0.04 wt.% to 0.12 wt.%. Oxides of Ti ($Ti_2O_3$) were observed as the Ti content increased to 0.03 wt.%. The specimen containing 0.11 wt.% of Ti exhibited the complex carbides of (Ti, Nb) C. The formation of Ti precipitates was critical to reduce the prior austenite grain size. Furthermore, the consistency of prior austenite grain size increased as the carbon and Ti contents increased. During the reheating process of hot-rolled steel, the most critical factor for controlling the prior austenite grain size seems to be the presence of Ti precipitates.
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2×2 서브블록에서 최소/최대값을 이용한 가역 정보은닉기법 연구
김우진,김평한,이준호,정기현,유기영,Kim, Woo-Jin,Kim, Pyung-Han,Lee, Joon-Ho,Jung, Ki-Hyun,Yoo, Kee-Young 대한전자공학회 2014 전자공학회논문지 Vol.51 No.4
A novel reversible data hiding method using pixel value ordering and prediction error expansion in the sub-block is resented in this paper. For each non-overlapping $2{\times}2$ sub-block, we divide into two groups. In the min group, the lowest value is changed to embed a secret bit and the highest value is changed in the max group. The experimental results show that the proposed method achieves a good visual quality and high capacity. The proposed method can embed 13,900 bits on average, it is higher 4,553 bits than the previous method and the visual quality is maintained 31.39dB on average.
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Universal Rice Primer (URP)-RAPD 방법에 의한 어류 종 특이 marker의 동정
김우진,김경길,이정호,박두원,KIM Woo-Jin,KIM Kyung-Kil,LEE Jeong-Ho,PARK Doo-Won 한국수산과학회 2003 한국수산과학회지 Vol.36 No.3
Morphologically similar fish species were subjected to the random amplified polymorphic DNA (RAPD) analysis using universal rice primer (URP). The fish species tested were sea basses (Lateolabrax japonicus and L. maculatus), eels (Anguilla japonica, A. bicolor bicolor, A. rostrata, and A. anguilla), and flounders (Limanda yokohamae and L. herzensteinin). Highly reproducible RAPD patterns were observed with several potential species-specific markers. The results indicate that RAPD technique using URP is useful for distinguishing fish psecies in a rapid manner.
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난치성 신생혈관 녹내장에서 유리체강내 베바시주맙과 구후 트리암시놀론 동시 주사 효과
김우진,정진구,유인천,이동욱,Woo-Jin Kim,Jin-Gu Jeong,In-Cheon You,Dong-Wook Lee 대한안과학회 2010 대한안과학회지 Vol.51 No.4
Purpose: To identify the regression of neovascularization and relief of other symptoms after intravitreal bevacizumab and retrobulbar triamcinolone injection in neovascular glaucoma patients with no possibility of visual acuity recovery. Methods: A total of 15 eyes in 15 patients with neovascular glaucoma, who had no possibility of visual acuity recovery and could not be treated with surgical intervention despite pain from October 2008 to May 2009, were reviewed retrospectively. Changes in degree of pain, conjunctival injection, revascularization, and visual acuity were evaluated after injection. Results: Ten of the 15 (67%) neovascular glaucoma patients were male, with a mean age of 62.50±12.79 years. The most common prediposing ocular disease was diabetic retinopathy (9; 60%), and the others were central retinal vein occlusion (4: 26%), central retinal artery occlusion (1; 7%), and uveitis (1; 7%). Change in intraocular pressure was significant (p<0.001), as were decreases in the degrees of pain and conjunctival injection (p<0.001, <0.001) after the injections. Regression of neovascularization continued in 13 patients (87%) after two months. Conclusions: Intravitreal bevacizumab and retrobulbar triamcinolone injection is a safe intervention that can substantially relieve pain experienced by neovascular glaucoma patients. J Korean Ophthalmol Soc 2010;51(4):568-574
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신장이식후 피부병변엾이 폐결절로 발현한 Kaposi 육종 1 예
김우진(Woo Jin Kim),허우성(Woo Seong Heo),김재열(Jae Yeol Kim),허대석(Dae Seog Heo),김영환(Young Whan Kim),한진석(Jin Suk Han),이정상(Jung Sang Lee),서정욱(Jung Wook Suh) 대한내과학회 1998 대한내과학회지 Vol.54 No.4
The incidence of Kaposi`s sarcoma increases in renal transplant patients who had immunosuppressive therapy. In Korea, 4 cases of Kaposi`s sarcoma in renal transplant patients have been reported. All of these cases had skin lesions, We experienced pulmonary Kaposi`s sarcoma in 25- year -old man proven by open lung biopsy, He had received cyclosporine and prednisolone as immunosuppressive agent for 8 months since renal transplantation. He admitted to the hospital because of fever and pulmonary nodules on chest X-ray, and he had no skin lesion. Sputum examinations were negative for microorganisms and malignancy. He had bloody and frothy secretions on bronchoscopic study, and BAI. fluid examinations were negative for microorganisms and malignancy. Open lung biopsy was carried out which showed Kaposi`s sarcoma nodules. Immunosuppressive agents were discontinued after diagnosis but pulmonay nodules progressed. He died of respiratory failure 10 days after diagnosis. Pulmonary Knnsi`s sarcoma has to be considered in the differential diagnosis in immunosuppresed patients who present with fever and pulmonary nodules.
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