청색 유기발광소자 제작 및 특성분석에 관한 연구

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)

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.

탄화수소계 연료를 이용한 냉각기술

김중연,박선희,전병희,김성현,정병훈,한정식 한국항공우주학회 2010 한국항공우주학회 학술발표회 논문집 Vol.2010 No.4

Cross-Cultural Adaptation and Measurement Properties of Korean Version of Western Ontario Shoulder Instability Index

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.

DPCM 기법을 이용한 CAN 기반의 자동 제어 장치 개발

김중연,육의수,김성호 제어로봇시스템학회 2009 제어로봇시스템학회 합동학술대회 논문집 Vol.2009 No.12

1.55μm RWG-DFB 레이저 제작에 관한 연구 ( Fabrication of 1.55μm RWG-DFB Lasers )

김중연,강명구,전현성,오환술 대한전자공학회 1998 대한전자공학회 학술대회 Vol.1998 No.7

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.

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.

염증성 대동맥류 12예의 임상 경험

김중연,문인성,박장상,김승남,고용복 대한외과학회 1997 대한외과학회 학술대회 초록집 Vol.1997 No.11

Investigation of the Influence of Induced Mood on Rehabilitation Engagement: a Study Focusing on Muscle Activity

김중연,정봉근 대한의용생체공학회 2022 의공학회지 Vol.43 No.3

Engagement is an important factor in the field of rehabilitation as it is a known factor that have a positive influence on functional gaining in people who receive rehabilitation therapy. Although a number of measurements for engagement have been recently developed, investigation of possible factors that may have influence on engagement is not well established. Currently available evidence suggests that engagement is affected by mood and it is hypothesized that a personal factor may contribute to engagement. Therefore, this study aims to test the hypothetical relationship between mood and engagement while performing a manual dexterity task through an experiment in healthy participants prior to investigation on people with medical condition who requires rehabilitation therapy. After inducing target mood (positive or negative mood) for study participants by asking them to recall autobiographical memories, change in muscle activity, which was operationalized as an indicator of engagement, was investigated. Electromyogram (EMG) was recorded from four muscle areas in non-dominant hand side to quantify muscle activity. The results show that the target moods were appropriately induced with the method. Although there were subtle differences in the level of engagement between different moods, certain variables derived from muscle activity were significantly different; mean amplitude for wrist extensor EMG showed significant difference between different moods (Z = -2.023, p < .05) indicating that muscle activities in the wrist extensor are greater for positive mood than negative mood region during manual dexterity task. Meanwhile, performance outcomes of Minnesota Manual Dexterity Test (MMDT), such as mean completion time and number of errors, between moods showed no significant difference in two different moods, resulting in MMDT administration may not be useful task in distinguishing the level of rehabilitation engagement.