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저전압구동 ZnS:Mn EL device의 제작 및 전기 광학적 특성조사
김재범,김도형,장경동,배종규,남경엽,이상윤,조경제,장훈식,이현정,이동욱,Kim, Jae-Beom,Kim, Do-Hyeong,Jang, Gyeong-Dong,Bae, Jong-Gyu,Nam, Gyeong-Yeop,Lee, Sang-Yun,Jo, Gyeong-Je,Jang, Hun-Sik,Lee, Hyeon-Jeong,Lee, Dong-Uk 한국재료학회 2000 한국재료학회지 Vol.10 No.4
ZnS:Mn TFEL device를 전자선 진공증착법으로 제작하여 전기광학적 특성에 관하여 조사하였다. $Ta_2O_5$ 박막의 산소 결핍에 따른 정전용량을 측정하기 위하여 산소분위기에서 열처리에 따른 AES(Auger electron spectroscopy)와 C-F를 측정하였다. 제작한 EL 소자의 전기장 발광 파장은 550~650nm 였으며 이것은 $Mn^{2+}$ 이온의 $3d^5$ 여기준위인 $^4T_1(^4G)$ 에서 $3d^5$ 기저준위인 $^6A_1(^S)$로의 내각전자전이 피크이다. 열처리를 수행하지 않은 $Ta_2O^5$를 절연층으로 사용한 EL 소자의 발광시작전압은 24~28V이고 색도 좌표값 X=0.5151, Y=0.4202인 황등색 발광을 하였다. $Ta_2O_5$를 절연층으로 사용한 소자가 저전압에서 구동이 가능하므로 EL 소자의 실용화가 기대된다. ZnS:Mn TFEL devices were fabricated by electron-beam evaporation method and then the electro-optical properties were investigated. To investigate the capacitance which was due to oxygen vacancy at the $Ta_2O_5$ thin film, AES(Auger Electron Spectroscopy) and C-F(capacitance-frequency) measurements were used. It was found that the capacitance was decreased by annealing the $Ta_2O_5$ film in oxygen ambience. From EL emission measurement, we observed the EL emission spectrum which had the peak range from 550nm and 650nm. This emission is associated with the transition from $^4T_1(^4G)$ first excited state to $^6A_1(^6S)$ ground state in the $3d^5$ energy level configuration of $Mn^{2+}$ occurs. The threshold voltage of EL device with $Ta_2O_5$ insulator layer was found to be 24V~28V. The CIE color coordinates of these emission are X=0.5151, Y=0.4202 which is yellowish orange emitting. The EL device using $Ta_2O_5$ insulator layer can be driven with a low voltage which is beneficial to the practical application.
장훈(Jang Hun),성백섭(Back-Sub Sung),차용훈(Yong-Hoon Cha),김덕중(Duck-joong Kim),이연신(Youn-sin Lee) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.5
In the super slow speed die casting process, the casting defects due to melt flow should be controlled in order to obtain sound casting products. The casting defects that are caused by molten metal were cold shut formation, entrapment of air, gas, and inclusion. But the control of casting defects has been based on the experience of the foundry engineers. The calculation of simulation can produce very useful and important results. The calculation data of die casting process condition from the computer simulation by the Z-CAST is made to insure that the liquid metal is injected at the right velocity range and that the filling time is small enough to prevent premature solidification. The parameters of runner shape that affected on the optimized conditions that was calculated with simple equation were investigated. These die casting process control techniques of automobile valve body mid-plate have achieved good agreement with the experimental data of tensile strength, hardness test, and material structure photographies satisfactory results.
열을 동반한 첫 번째 경련 환아에서의 요추 천자 검사의 유용성
임장훈 (Jang Hun Lim),사공영(Young SaKong),이균우(Kyun Woo Lee),배상남(Sang Nam Bae),남상욱(Sang Ook Nam) 대한소아신경학회 2003 대한소아신경학회지 Vol.11 No.2
목 적 : 열성 경련은 임상에서 가장 흔히 경험하는 소아 신경 질환의 하나이다. 이 연구에서는 열을 동반한 첫 번째 경련 환아의 임상 양상과 요추 천자 검사의 유용성과 검사시기에 관하여 조사하였다. 방 법 : 1999년 4월부터 2003년 3월까지 열을 동반한 첫 번째 경련을 주소로 내원하여 요추 천자 검사를 시행 받았던 열을 동반한 첫 번째 경련 환아 220명을 대상으로 하였으며 임상 양상 및 요추 천자 검사결과를 후향적으로 분석하였다. 결 과 : 1) 열을 동반한 첫 번째 경련 환아 220명 중 남아가 129례(58.6%), 여아가 91례(41.4%)이었다. 2) 연령은 6개월 이상 3세가 180례(81.7%)로 가장 많았단(P<0.05). 3) 가족 중에 열성 경련의 병력을 가졌던 환아는 67례(30.5%)이었다. 4) 경련의 형태는 강직-간대성이 160례(72.7%)로 가장 많았고 강직성 39례(17.7%), 간대성 14례(6.4%) 순이었다. 5) 발열의 원인으로는 인두편도염이 40.5%로 가장 많았고, 위장관염, 폐렴 또는 기관지염, 중이염, 요로 감염, 돌발진 순이었으며 뇌수막염은 9.1%를 차지하였다. 6) 뇌수막염 환아 20례 중 18례가 3세 미만이었다. 결 론 : 요추 천자 검사는 열을 동반한 첫 번째 경련 환아에서 뇌수막염을 감별할 수 있는 유용한 검사이며 특히 3세 미만의 모든 열을 동반한 첫 번째 경련 환아에서는 뇌수막염을 감별하기 위하여 요추 천자 검사를 꼭 시행하여야 할 것으로 사료된다. Purpose : This study was performed to find out the role of routine lumbar puncture in children presented with their first seizure with Fever. Methods : This study included 220 children, over a 5 year period, from April 1999 to March 2003, who visited or were admitted at Dae Dong Hospital with their first febrile convulsion. Lumbar puncture was performed in all children. We analyzed their age, family history, type of seizure, duration of seizure, cause of fever, and the results of lumbar puncture. Results : In the sex distribution, males(58.6%) outnumbered females(41.4%) and the ratio was 1.2:1. 81.7% of the patients had febrile convulsion from 6 months- to 3 years of age(P<0.05). 30.5% also had family history of febrile convulsion. The types of seizure were generalized tonic-clonic(72.7%), generalized tonic(17.7%), and generalized clonic(6.4%). For the duration of seizure, 90.4% of the patients were estimated less than 15 minutes(P<0.05). The causes of fever were pharyngotonsilitis(40.5%), gastroenteritis(19.1%), pneumonia or bronchitis(13.2%), meningitis(11%), otitis media, urinary tract infection, and exanthem subitum. However, 9.1% of the patients were diagnosed meningitis, with 18 of 20 patients under 3 years of age. Conclusion : In the first seizure with fever, lumbar puncture is a useful method for meningitis, especially under 3 years of age.
이장훈,Lee, Jang-Hun 대한에이즈예방협회 2006 레드리본 Vol.71 No.-
레드리본은 HIV에 감염되지 않은 사람들이 에이즈에 대해 어떻게 생각하는지 알아보기 위해 연령대별,성별로 한 명씩 에이즈에 대한 솔직한 의견을 싣고 있다. 이번 호에서는 그 네번쨰로 40대의 생각을 들어본다.
인가 전류가 구리 도금 피막과 폴리이미드 필름의 접합력에 미치는 영향
이장훈(Jang-hun Lee),한윤성(Yoonsung Han),이호년(Ho-Nyun Lee),허진영(Jin-Young Hur),이홍기(Hong Kee Lee) 한국표면공학회 2013 한국표면공학회지 Vol.46 No.1
The effect of the additionally applied electrical current on the adhesion strength between electroless Cu and polyimide films was investigated. Peel tests were performed after applying electrical current within the range from 0.1 to 100 ㎃ for the duration from 1 to 30 minutes. Sample with more than 1 ㎃ of additional electrical current for 1 minute showed higher adhesion strength than that without additional electrical current. However, samples with 10 ㎃ of additional electrical current for more than 10 miniutes showed the degradation of adhesion strength. Ra and RMS values of the peeled polyimide surface were proportional to the adhesion strength though there were no significant changes in the morphology of the peeled surfaces with varied amount and time-length of additional electrical current. Applying electrical current could increase the density of chemical bonding, which results in increase of the adhesion strength between copper and polyimide. However, in the case of applying additional electrical current for excessive amount or time, the degradation of the adhesion strength owing to the formation of copper oxide at the interface could occur.