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김중연,노병규,강명구,오환술 대한전자공학회 2002 電子工學會論文誌 IE (Industry electronics) Vol.39 No.1
본 논문은 청색 유기 EL 소자를 진공증착법으로 제작하여 그 특성을 분석하였다. 발광층 물질(A1q/sub 3/)에 게스트물질(Type I-TPB와 Type II-DPA)의 도핑농도(0.5∼2 wt%)를 변화시켜 청색발광소자를 제작하여 전기적, 광학적 특성을 조사하였다. Alq3에 도펀트의 농도를 증가함에 따라 청색에 해당하는 색좌표 점으로 이동하였다. Type I이 Type II의 경우보다 동작개시전압 및 구동전압이 낮게 나타났으며 휘도에서는 Type II가 밝게 나타났다. Alq/sub 3/에 DPA(2wt%)를 도펀트로 사용한 소자의 경우 인가전압 15V에서 휘도는 1282cd/m/sup 2/, 최대발광 파장은 476nm, 색좌표는(0.1273, 0.0672)으로 우수한 특성을 나타내었다. In this thesis, blue emission organic light emitting devices were fabricated by using vacuum deposition method. Two types of device were employed to realize blue emission. Type I had an emitting layer containing TPB-doped $Alq_3$ and type II had an emitting layer containing DPA-doped $Alq_3$. The variable dopant concentration was 0.5 ~2 wt%. The electrical and optical characteristics of these devices have been investigated. The more dopant concentration increased, the nearer the blue coordinate. Type I than type II had a lower turn on voltage and driving voltage. The emission luminescence of type II was brighter than that of type I. When we applied 15V to type II with DPA(2wt%)-doped $Alq_3$, we have achived the emission luminescence of 1282cd/$m^2$, the emission wavelength of 476nm and the blue emission CIE coordination of (0.1273, 0.0672)
김중연,이지영,지은규,이상헌 대한보조공학기술학회 2023 대한보조공학기술학회지 Vol.15 No.2
Background : Western Ontario Shoulder Instability Index (WOSI) is a disease specific questionnaire to measure quality of life with regards to shoulder instability. This study aimed to enable cross-cultural adaptation of Western Ontario Shoulder Instability Index into Korean and investigate its reliability and validity. Methods : Translation was completed in accordance with the translation and backward translation guideline that development team recommend. The Korean WOSI (K-WOSI) and Korean Quick Disabilities of the Arm, Shoulder and Hand for Koreans (K-QuickDASH) were answered by subjects for reliability and validity test. K-WOSI was filled out again after the first evaluation after mean 2 days. In addition, floor and ceiling effects were evaluated. Results : Total 16 patients waiting for shoulder stabilizing surgery recruited. Internal consistency was high (Cronbach‘s alpha = 0.97 for total score of K-WOSI). Test-retest reliability measured by Pearson’s r and Intraclass Correlation Coefficient for total score were 0.86 and 0.92 respectively, confirming excellent reliability. And total scores of K-WOSI and K-QuickDASH showed high correlation (Pearson’s r = 0.88). Also, there were no floor and ceiling effects observed in the K-WOSI. Conclusions : The study findings confirmed that K-WOSI is a reliable and valid tool that assesses patients‘ quality of life with shoulder instability.
사과 주 재배지 경북 청송 지역 사과 탄저병원균의 살균제에 대한 감수성 조사
김중연,김흥태,전용호 한국식물병리학회 2023 식물병연구 Vol.29 No.2
Apple grower in the Cheongsong region, Korea has reported the increased loss of apple yield due to severe bitter rot incidence. We noticed that this indience is because the Colletotrichum population has developed resistance to commonly used fungicides. We isolated 39 Colletotrichum isolates from 13 orchards in Cheongsong, and all the isolated Colletotrichum species were identified as C. siamense or C. fructicola. These 39 strains were tested for mycelial growth and conidial germination against 12 fungicides. trifloxystrobin (30–55% in recommended concentrations) was shown lower inhibitory effect on mycelial growth. However, the inhibition of conidial germination was shown higher than mycelial growth (62–100%). Kresoxim-methyl was shown lower inhibitory effect on mycelial growth (29–55%). conidial germination inhibitory effect was shown 51% to 96%. dithianon was shown diversity response to inhibition of mycelial growth (43–100%). tebuconazole was shown high inhibitory effect on mycelial growth (84–100%) and conidial germination inhibitory effect was shown to be 64 to 100%. metconazole has been found to display with high inhibitory effect on mycelial growth (79–100%) and conidial germination (70–80%). fluazinam was shown to possess high inhibitory effect on mycelial growth (87–100%) and conidial germination (94–100%). This study provides basic information for the effective management of apple bitter rot.
고효율 OLED 제작을 위한플라즈마 조건 변화에 따른 ITO 특성 분석
김중연,강명구 대한전자공학회 2007 電子工學會論文誌 IE (Industry electronics) Vol.44 No.2
This paper aims to analyze the characteristics of ITO which are caused by variation of plasma condition to fabricate the OLED of high efficiency. We treated N2 gas and O2 gas plasma on the surface of the ITO by changing their RF plasma power into 100 W, 200 W, 400 W and by changing their gas pressure into 12 mTorr, 120 mTorr. The work function of ITO that plasma treatment was done by using N2 gas had value of 4.88~5.07 eV, and that by using O2 gas, 4.85~4.97 eV. The characteristics of the ITO were most efficient in the N2 gas plasma with the RF power of 200 W and gas pressure of 120 mTorr. The rms roughness of ITO surface is the value from AFM image. In this case, ITO obtained 25.2 Å and 30.5 Å in the N2 and O2 gas plasma respectively when it had the RF power of 200 W. But ITO that didn't have plasma treatment was 44.5 Å. The variation of ITO transmittance was almost not discovered by the change of N2 gas and O2 gas pressure. 본 논문에서는 고효율의 유기발광소자 제작을 위해 플라즈마 조건 변화에 따른 ITO 특성을 분석하였다. N2와 O2 가스로 RF 플라즈마 출력은 100 W, 200 W, 400 W로 가스압력은 12 mTorr, 120 mTorr로 변화실험을 하였다. N2 가스를 이용하여 플라즈마 처리한 ITO의 일함수는 4.88~5.07 eV의 값을 나타내었고 O2 가스를 이용하여 플라즈마 처리한 ITO는 4.85~4.97 eV의 일함수를 나타내었다. N2 가스에서 가스의 압력이 120 mTorr이면서 플라스마 출력이 200 W의 조건에서 RF 플라즈마 처리한 ITO의 특성이 우수하였다. ITO 표면의 rms roughness는 AFM 이미지에서 계산하여 나타낸 수치로써 N2 와 O2 가스가 주입된 플라즈마로 처리된 ITO는 플라즈마 출력이 200 W일 때 각각 25.2 Å과 30.5 Å로 나타났으며 플라즈마 처리되지 않은 ITO는 44.5 Å이었다. ITO 박막의 투과율 측정에서는 N2와 O2 가스의 압력을 변화시켜도 ITO의 투과율은 거의 변동이 없었다.
플라즈마 조건 변화에 따른 ITO 특성 분석 및 유기발광소자의 제작에 관한 연구
김중연,강성종,조재영,김태구,오환술,Kim, Joong-Yeon,Kang, Seong-Jong,Cho, Jae-Young,Kim, Tae-gu,Oh, Hwan-Sool 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.10
In this experiment, OLEDs(Organic Light Emitting Diodes) was fabricated to confirm effect of Plasma treatment which increase the hole injection characteristic from anode. Device structure was $ITO/2-TNATA/{\alpha}-NPD/DPVBi/BAlq/Alq_3/Al:Li$. We used DPVBi (4, 4 - Bis (2,2-diphenylethen-1-yls) - Biphenyl) as a blue emitting material. To optimize the process condition of plasma treatment, we used 2 gases of the oxygen and nitrogen gas under 120 mTorr with 100 W, 200 W, and 400 W plasma power. The current efficiency of $N_2$ plasma is more efficient than that of $O_2$ plasma. At $1000 cd/m^2$, we obtained the maximum current efficiency of 6.45 cd/A using $N_2$ gas with 200 W plasma power.
김중연,강성종,로병규,강명구,오환술,Kim, Jung-Yeoun,Kang, Seong-Jong,Roh, Byeong-Gyu,Kang, Myung-Koo,Oh, Hwan-Sool 대한전자공학회 2002 電子工學會論文誌 IE (Industry electronics) Vol.39 No.2
In this paper, single-layer white organic light emitting device was fabricated on ITO glass substrate using PVK as host, Bu-PBD as electron transport layer, Nile Red, Coumarin 6, TPB as red, green, blue color fluorescent dyes. The red, green, blue organic light emitting devices were fabricated respectively. After the characteristic analysis of each color device, the white organic light emitting device was fabricated with optimized condition of each color device by spin coating method. we obtained white emission CIE coordination of (0.32, 0.34) and luminescence of 785cd/$m^2$ at driving voltage of 20V with condition of PVK(70wt%), Bu-PBD(30wt%), Nile Red(0.015mol%), Coumarin 6(0.04mol%), TPB(3mol%).? 본 논문은 백색유기발광소자를 구현하기 위해서 빛의 3원색인 적, 녹, 청색의 형광색소를 적절하게 배합하여 단일층 백색광을 얻었다. 개별적인 적색, 녹색, 청색 유기고분자 발광소자의 성능이 가장 우수한 특성을 조사한 후 최적화된 값으로 백색유기발광소자를 제작하였다. PVK와 Bu-PBD를 각각 70wt%, 30wt%로 혼합한 용액에 Nile Red(0.015mol%), Coumarin6(0.04mol%), TPB(3mol%)를 각각 첨가하여 백색발광소자를 제작하였을 때 구동전압이 20V에서 휘도 785cd/$m^2$, 색좌표가 (0.32, 0.34)인 백색광을 얻었다