<tex> ${\rm TmBa}_{2}{\rm Cu}_{3}{\rm O}_{7-{\rm x}}$</tex> Superconducting Thin Films Grown by Pulsed Laser Deposition

Rock-Kil Ko,O-Jong Kwon,Kyu-Jeong Song,Ahmad, D.,Chan Park,Joon-Ho Lee,Seung-Su An,Nam-Jin Lee,Sang-Soo Oh,Young-Cheol Kim Institute of Electrical and Electronics Engineers 2007 IEEE transactions on applied superconductivity Vol.17 No.2

<P>TmBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> <SUB>-</SUB> <SUB>x</SUB> films which is one of the (Rare earth)Ba<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> <SUB>-</SUB> <SUB>x</SUB> high temperature superconductors with small ionic radius of rare earth element, were deposited on STO (100) single crystal substrates and Y<SUB>2</SUB>O<SUB>3</SUB>/YSZ/CeO<SUB>2</SUB> buffered metal substrates by pulsed laser deposition. The J<SUB>c</SUB> (77 K) and the value of onset of Tc TmBCO thin film on STO substrate was 4.5 MA/cm<SUP>2</SUP> and 86 K, respectively. The of J<SUB>c</SUB> TmBCO coated conductor on metal substrate was 1 MA/cm<SUP>2</SUP> . In-field property measurement was carried out at temperatures between 10 K and 77 K in magnetic filed up to 6 T in PPMS system. This is the first report, to the best of our knowledge, of TmBCO thin films and coated conductors with TmBCO film as the superconducting layer which have critical current densities at 77 K of 4.5 MA/ cm<SUP>2</SUP> and 1 MA/cm<SUP>2</SUP> , respectively. The superconducting properties of TmBCO films and the possibility of using TmBCO film as the superconducting layer of the HTS coated conductor, were investigated.</P>

전복느타리버섯(Pleurotus cystidiosus O.K.Miller) 의 인공재배에 관한 연구

장갑열 ( Jang Gab Yeol ),전창성 ( Jeon Chang Seong ),신철우 ( Sin Cheol U ),박정식 ( Park Jeong Sig ),오세종 ( O Se Jong ),최선규 ( Choe Seon Gyu ),성재모 ( Seong Jae Mo ) 한국균학회 2003 韓國菌學會誌 Vol.31 No.3

증례보고 : Charcot-Marie-Tooth병 환자에서 발생한 Rocuronium에 의한 근이완에서의 회복 지연

정용관 ( Yong Kwan Cheong ),이철 ( Cheol Lee ),손용 ( Yong Son ),송윤강 ( Yoon Kang Song ),김태요 ( Tai Yo Kim ),김대중 ( Dea Jung Kim ),오세리 ( Se Ri O ) 대한마취과학회 2007 Korean Journal of Anesthesiology Vol.53 No.1

Charcot-Marie-Tooth disease, which is also known as hereditary motor and sensory neuropathy, is a heterogenous group of inherited diseases of the peripheral nerve. The spectrum of severity varies from asymptomatic individuals to those with severe limb abnormalities requiring corrective surgery. We report two brothers who had previously been diagnosed with Charcot-Marie-Tooth disease 3 years earlier and were scheduled to undergo a correction osteotomy of both feet under general anesthesia. General anesthesia was induced with propofol 2 mg/kg, rocuronium 0.8 mg/kg and was maintained with O2-N2O-Sevoflurane. The younger brother showed no delay in recovery of the neuromuscular blockade but the elder brother showed a delay. (Korean J Anesthesiol 2007; 53: 145~9)

잠제의 형상 변화에 따른 반사파 및 투과파의 거동특성

이철응,오원택 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.A

A numerical model is represented to calculate the wave fields such as the reflected waves, the transmitted waves, and depth averaged velocities over submerged breakwaters for the normally incident wave trains of nonlinear monochromatic wave. The numerical model is correctly formulated by using both the finite amplitude shallow water equations with the effects of bottom friction and the explicit dissipative Lax-Wendroff finite difference scheme, also satisfactorily verified by comparison with the other results. The behaviors of reflected and transmitted waves with respect to geometric parameters of submerged breakwater such as the slope, crest depth, and crest width are numerically analyzed in this study. In particular, the reflection and transmission coefficients are quantitatively calculated as the function of geometric parameter of submerged breakwater. It is found that the crest depth among parameters related to practical design may be the most important parameter in designing the submerged breakwater. Therefore, the effective and economic performances of submerged breakwater should be depended on the determination of optimal crest depth.

Apoptosis의 분자적 특징과 조절 기작

김진우,조철오 아주대학교 의과학연구소 1998 아주의학 Vol.3 No.1

모든 생명체를 이루고 있는 세포는 생명현상이 이루어지는 가장 기본적인 단위이다. 생명체 내에는 이러한 세포들의 수를 적당 수준으로 유지하는 기작이 존재하고 있어서 원활한 생명현상을 수행하도록 하고 있다. 만일 세포 숫자의 조절이 여러 요인들에 의해 깨어지면 생명체에 치명적인 결과를 가져올 수 있다. 따라서 이들 세포들의 적절한 수를 조절하는 정밀한 기작들이 생명체에는 존재하고 있는데, 이 중의 하나가 죽음에 의한 조절이다. 죽음에 의한 생명의 조절 현상은 다세포 생물의 발생과정이나 조직의 분화, 또는 암이나 면역결핍 들의 질병에서 볼 수 있게 되는데. 대부분의 경우 apoptosis라는 특이한 세포의 능동적인 기작을 통하여 이루어지게 된다. Apoptosis에 대한 연구는 1970년대의 현미경학적인 접근에서 그 특이한 형태적인 특징으로 구분되어 졌다. 1980년대 이후 분자생물학과의 접목으로 본격적인 연구가 이루어져 현재 생물학계에서 가장 활발한 연구분야의 하나가 되었다. 이 분야의 연구는 다양한 관심 분야에서 다각적인 접근이 이루어지고 있다. 이를 통해 최근 몇 년 동안에는 apoptosis 과정에 관여하는 여러 유전자들의 발견과 이들의 상호 연관성에 대한 연구 결과들이 보고되고 있어 apoptosis의 신비를 풀어 줄 실마리를 제공하고 있다.

기니픽에서 Salicylate에 의한 유발이음향방사의 변화

박찬일,장재웅,신광철,이오영 충남대학교 의과대학 지역사회의학연구소 1999 충남의대잡지 Vol.26 No.2

A Reversible hearing loss and tinnitus have been known resulting from large doses or longterm use of salicylate. The exact cause of salicylate ototoxicity is unknown. Cochlear electrophysiology and otoacoustic emission studies suggest that the drug may interfere with outer hair cell clectromotility. The changes in transiently evoked otoacoustic emission(TEOAEs) were observed in guinea pigs after the intramuscular injection of salicylate(150, 300, 450 mg/kg). TEOAEs decreased slowly after the injection salicylate in a dose-dependent manner. Absence of echo response was detected 3 hours after the injection of 300mg/kg in 2 of 5 guinea pigs, 2 hours after the injection of 450mg/kg in 3 of 6 guinea pigs, 3 hours after the injection of 450mg/ kg in 3 of 6 guinea pigs. Echo response returned to control level in 6 hours after injection of 300mg/kg, in 7 hours after infection of 450 mg/kg. Findings support that salicylate affect electromotility of outer hair cells.

진폐진행정도에 따른 혈청내 구리와 아연 농도의 변동

박정래,박종욱,이수일,이철호,오차재,김창원,조병만,김돈균 大韓産業醫學會 2000 대한직업환경의학회지 Vol.12 No.3

목 적 : 진폐증은 분진으로 인해 인체의 면역기전이 작용하여 폐섬유화가 진행되는 질환으로, 인체의 면역기전에 작용하는 구리와 아연은 진폐증의 병리적인 진행과정인 폐섬유화에 관여한다. 본 연구의 목적은 초기진폐증 유소견자와 진행된 진폐증 환자의 혈청 구리와 아연의 농도를 정상인과 비교함으로써 체내 구리와 아연의 농도가 진폐증의 섬유화의 진행정도에 따라 변동함을 밝히고, 이를 이용하여 폐섬유화의 진행정도를 추정할 수 있는 지표를 제시하고자 한다. 방 법 : 진폐정밀기관에 내원한 초진내 원자 100명과 진폐요양기관에 입원한 진폐증 환자 100명을 선정한 후 흥부사진소견을 ILO 분류법의 진폐진행정도에 따라 각각 세 군(Stage Vl, V2, V3 & Stage Pl, P2, P3)으로 구분한 후 각 군의 혈청구리와 아연의 농도를 비교분석하였다. 대조군으로는 폐결핵, 심근경색, 뇌경색을 경험한 적이 없는 일반인 100명을 선정하였다. 결 과 : 초진내 원자군의 혈청 구리농도는 섬유화의 진행단계에 따른 유의한 차이를 보였으며, Stage V3에서 가장 높았다. 입원환자군에서는 혈청 구리농도가 대조군과 유의한 차이를 보이지 않는데 (p=0, 152), 이는 입원환자의 불량한 영양상태와 건강상태 때문인 것으로 추정된다. 초진내원자군과 입원환자군의 혈청 아연농도는 섬유화의 진행에 따라 통계적인 차이를 보였으며, Stage V2와 Stage P2, P3에서 각각 대조군에 비해 유의하게 낮았다. 혈청 아연과 구리농도의 비또한 양군에서 섬유화의 진행에 따라 의미있게 높았는데, 섬유화가 현저히 진행된 단계 (Stage V3, Stage P2, P3)에서 대조군과 의미있는 차이를 보였다. 결 론 : 초진내 원자와 입원환자의 혈청 Cu/zrl 비는 섬유화의 진행정도가 현저할수록 대조군에 비해 유의하게 높게 나타났다. 진폐증 환자들의 혈청 Cu/zn 비는 진폐증의 폐섬유화의 진행정도를 추정함에 있어 상당히 유용한 지표로 이용될 수 있으며, 폐섬유화의 진행과정에서의 혈청 구리와 아연의 작용기전을 이용한 치료방법의 마련에도 도움이 될 것으로 판단한다. Objectives : Copper and Zinc, the trace elements of a living body, take a part in immunologic mechanism and induce the pulmonary fibrosis which is the pathologic progress of pneumoconiosis. This study was performed to assist the identification of the pathologic process of pulmonary fibrosis in pneumoconiosis. Methods : The subjects of thls study was 200 diagnosed persons as pneumoconiosis, of whom 700 persons was the visitors in the outpatients departments of pneumoconiosis and 100 admissive pneumoconiosis patients. The serum copper and zinc are measured and compared. Results : The mean serum copper concentration of visitor group was significantly higher than that of control group, and that of stage V3 subgroup of visitor group was highest because of their advanced fibrosis. But, there was not the difference of serum copper concentration between patient and control group. We thought that the reason was poor nutritional and health status of the patient. The mean of serum zinc concentration of visitor and patient control was lower than that of control group. As the degree of pulmonary fibrosis was more severe from stage Vl, V2, V3 of visitor to stage Pl, P2, P3 of patient, the mean of serum zinc concentration was lower. The ratio of serum copper/zinc of visitor and patient was higher than that of control, and that of patient was higher than that of visitor. Those results showed that the ratio of serum copper/zlnc ratio more greatly expressed the degree of progression of pneumoconiosis than only copper or zinc concentration by adjustment of nutritional and health status of the patient. Conclusions : As above study results, the degree of pulmonary fibrosis of pneumoconiosis could be estimated by means of serum copper/zinc ratio.

대한산업보건협회 산업보건연구소의 미국 정도관리 참여결과

이선주,최호춘,박찬우,오미순,이준승,전수경,박화미,정규철,Lee, Seon-Ju,Choe, Ho-Chun,Park, Chan-U,O, Mi-Sun,Lee, Jun-Seung,Jeon, Su-Gyeong,Park, Hwa-Mi,Jeong, Gyu-Cheol 대한산업보건협회 1995 산업보건 Vol.88 No.-

PAT program(The Proficiency Analytical Testing Program)은 미국산업위생협회(American Industrial Hygiene Association AIHA)와 미국산업안전보건연구원(National Institute for Occupational Safety and Health NIOSH)에서 공동주관하는 정도관리로서 일년에 4회 실시하고 있다. 실시항목은 금속(납, 카드뮴, 크롬, 아연), 유리규산, 석면, 유기,용제(Benzen, O-Xylene, Toluene, Carbon Tetrachloride, 1, 1, 1-Trichloroethane, Chloroform, Tetrachloroethylene, 1, 2-Dichloroethane, methanol, p-Dioxane)이다. 대한산업보건협회 산업보건연구소에서는 위의 4가지 항목을 모두 신청하여 1995년 1월에 실시된 120회 부터 참여하였는데 다음은 본 연구소의 120화에 대한 분석방법과 NIOSH로 부터 받은 결과이다.

고온 용융염에서 Fe기 및 Ni기 초합금의 부식거동 및 합금원소의 영향

조수행,장준선,정명수,오승철,신영준,Jo, Su-Haeng,Jang, Jun-Seon,Jeong, Myeong-Su,O, Seung-Cheol,Sin, Yeong-Jun 한국재료학회 1999 한국재료학회지 Vol.9 No.10

Incoloy 800H, KSA (Kaeri Superalloy)-6, Inconel 600 및 Hastelloy C-276 합금의 용융염에서의 부식거동을 650~85$0^{\circ}C$ 온도범위에서 조사하였다. LiCl-Li$_2$O혼합용융염에서의 부식은 Li$_2$O에 의한 염기성 용해 기구에 의해 진행되며, 부식속도가 LiCl에서보다 훨씬 빠르게 나타났다. 혼합용융염 LiCl-Li$_2$O에서는 Ni기 합금의 부식속도가 Fe기 합금보다 빠르고, Mo와 W의 함량이 높은 Hastelloy C-276이 가장 빠른 부식속도를 나타내었다. 용융염 LiCl에서는 LiCrO$_2$의 단일 부식층이 형성되고, LiCl-Li$_2$O 혼합용융염에서는 산화물과 Ni의 2상구조의 다공성 부식층이 형성되었다. Corrosion behaviors of Incoloy 800H, KSA(Kaeri Superalloy)-6, Inconel 600 and Hastelloy C-276 in molten salts were investigated in the temperature range of 650 ~ $850^{\circ}C$. Due to $\textrm{Li}_{2}\textrm{O}$-induced basic fluxing mechanism, the corrosion rates of the alloys in mixed molten salt of LiC1-$\textrm{Li}_{2}\textrm{O}$ were significantly higher than those in molten salt of LiCl. In the mixed molten salt, Fe-base alloys showed higher corrosion resistance than the Ni-base alloys. and Hastelloy C-276 with high Mo and W contents exhibited the highest corrosion rate among the examined alloys. The single layer of $\textrm{LiCrO}_{2}$ was formed in molten salt of LiCl and two phase structure of a scale consisted of oxides and Ni was formed in the mixed molten salt.

Digital Implementation of Optimal SR ON-time Control and Asymmetric Duty Control in LLC Resonant Converter

Cheol-O Yeon,Dong Kwan Kim,Jae-Bum Lee,Jong-Woo Kim,Cheon-Yong Lim,Gun-Woo Moon 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6

In this paper, a half-bridge (HB) LLC resonant converter which has been used for server power supply, is controlled by digital controller. In order to increase the entire load efficiency of HB LLC converter, a synchronous rectifier (SR) should has a robust control at any condition such as PFC noise or the lack of current sensing. For these reason, digital controller with LLC SR control is preferred in server power supply market. In this paper, the optimal SR ON-time control which operates as a constant ON-time at below region, and the same ON-time of primary switch at above region, is implemented. However, the problems of optimal SR ON-time control still exist. Because of senseless operation, when the ON-time of SR is larger than the half period of LLC resonant tank, the current of converter flows reversely and it will make the big surge current which damage to active devices. From this result, the ON-time of SR should be shorter than the half period of LLC resonant tank. Moreover, in the case of current unbalance in center-tapped rectifier, the conducting time of rectifiers is different due to the parasitic components. Since the powering periods of two SR are different, the SR ON-time of HB LLC resonant converter should be determined by minimum conducting time of rectifiers. This result causes a large conduction loss of body diodes which makes the low efficiency or the reliability problem of LLC resonant converter. Therefore, HB LLC resonant converter with optimal SR ON-time control is implemented and the asymmetric duty control is proposed in this paper, which solves the current unbalance problem in center-tapped rectifier. Therefore, the LLC resonant converter which has wide input variation, can achieve the high efficiency with optimal SR ON-time control and eliminate the current unbalance problem with asymmetric duty control.