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전기-광 변환소자 응용을 위한 적색 유기 EL 소자의 광변조 특성
김주승,구할본,Kim, Ju-Seung,Gu, Hal-Bon 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.6
We fabricated red organic light emitting diodes(OLEDs) utilizing tis(8-hydroxyquinoline) aluminum $(Alq_3)$ doped with $5\%$ of (4-(dicyanomethylene)-2-i-propyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran) (DCJTI) and investigated the driving and modulation characteristics for applying to the electro-optical conversion device. To improve the driving characteristics of red OLEDs, 3 V of offset voltage, which is equal to the turn on voltage, Is applied to the device. Offset voltage enhanced the optical EL output and reduced the rise time of EL waveforms of red OLEDs, and hence the cutoff frequency is increased with increasing applied voltage. The optical pulse of 100 MHz has been obtained from red OLEDs. Therefore, we confirmed that the red OLEDs can be applied to the fields of optical communication as an electro-optical conversion device.
유두주위게실이 내시경유두큰풍선확장술을 이용한 총담관 결석 치료에 미치는 영향
이지원 ( Ji Won Lee ),김정호 ( Jung Ho Kim ),김연석 ( Yeon Suk Kim ),최현석 ( Hyun Seok Choi ),김주승 ( Ju Seung Kim ),정석후 ( Seok Hoo Jeong ),하민수 ( Min Su Ha ),구양서 ( Yang Suh Ku ),김연수 ( Yun Soo Kim ),김주현 ( Ju Hyun K 대한소화기학회 2011 대한소화기학회지 Vol.58 No.4
Background/Aims: Periampullary diverticulum (PAD) causes difficulty in the extraction of common bile duct (CBD) stones with conventional endoscopic therapy. Our study was designed to evaluate the effect of PAD on endoscopic large balloon dilation (EPLBD) with/without limited endoscopic sphincterotomy (EST) for CBD stone treatment. Methods: We retrospectively reviewed cases of 141 patients treated CBD stones by EPLBD with/without limited EST at Gachon Gil Medical Center from September 2008 to February 2010. PAD were classified into three groups according to the location of the papilla and diverticulum. Clinical parameters, endoscopic parameters, and procedure outcomes were analyzed. Results: PAD were identified in 46.1% (65/141), with 23 male (35.4%) and 42 female (64.6%) and a mean age of 72.9±11.1 years. Mean diameter of the stones was 14.8±6.0 mm and mean diameter of CBD was 21.6±7.7 mm. PAD group was significantly older than control group (72.9 vs. 68.6, p=0.043) and the incidence of large stone (≥15 mm) was higher in PAD group (60.0% vs. 42.1%, p=0.034). Success rate of complete removal of stones in the first session was 32/65 patients (49.2%) and overall successful complete stone removal rates was 63/65 (96.9%). There was no significant difference between the PAD and control groups in success rate. Major complications were similar between two groups. Conclusions: PAD is associated with an increased incidence of large bile duct stones and older age. PAD seems to not increase technical failure rate or complication risk on EPLBD with/without limited EST. (Korean J Gastroenterol 2011;58:201-207)
에너지전달을 이용한 가시광 Light Source의 발광특성에 관한 연구
구할본,김주승,김종욱,Gu, Hal-Bon,Kim, Ju-Seung,Kim, Jong-Uk 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.11
Red organic electroluminescent (EL) devices based on tris(8-hydroxyquinorine aluminum) (Alq$_3$) doped with red emissive materials, 4-(dicyanomethylene)-2-t-butyl -6-(l,1,7,7-tetramethyljulolidyl-9-enyl)4H-pyran (DCJTB). poly(3-hexylthiophene) (P3HT). rubrene and 4-dicyanomethylene-2-methyl-6[2-(2,3.6.7-tetrahydro-lH,5H-benzo-[i,j]quinolizin-8yl)vinyl]-4H-pyran (DCM2) were fabricated for applying to the red light source, The photoluminescence (pL) intensities of red emissive materials doped in Alq$_3$ are limited by the concentration quenching with increasing the doping ratio and the doping concentration of DCJTB, DCM2, P3HT and rubrene measured at the maximum intensity showed 5, 1, 0.5 and 2 wt%, respectively. Time-resolved PL dynamic results showed that the PL lifetime of red emissive materials doped in Alq$_3$ were increased more than the value of material itself. It means that the efficient energy transfer occurred in the mixed state and Alq$_3$ is a suitable host materials for red emissive materials, The device which was used DCJTB as a dopant achieved the best result of the maximum luminance of 594 cd/$m^2$ at 15 V and showed the chromaticity coordinates of x=0,624, y=0,371.
수술 후 발생한 Corynebacterium Striatum 복강 내 감염
최현석 ( Hyun Seok Choi ),김주승 ( Ju Seung Kim ),정을식 ( Eul Sik Jung ),김애진 ( Ae Jin Kim ),정한 ( Han Jung ),박윤수 ( Yoon Soo Park ),서일혜 ( Yiel Hea Seo ) 대한내과학회 2012 대한내과학회지 Vol.82 No.4
Corynebacterium striatum is an aerobic, Gram-positive bacillus that is part of the resident flora of skin and mucosal membranes. C. striatum is usually considered a non-pathogenic contaminant, although infective endocarditis and respiratory infection, and less frequently arthritis and meningitis, due to C. striatum have been reported. C. striatum has been particularly associated with catheter-related infections and infections following conditions that resulted in disruption of the skin barrier in both immunocompromised and immunocompetent hosts. We describe a case of post-operative intra-abdominal infection caused by the rare pathogen, C. striatum. (Korean J Med 2012;82:516-519)
소화기; 조기위암에서 내시경점막하박리술 후 국소 재발의 위험인자
김정호 ( Jung Ho Kim ),이정현 ( Jung Hyun Lee ),정준원 ( Jun Won Chung ),안정석 ( Jung Suk An ),원인식 ( In Sik Won ),이지원 ( Ji Won Lee ),하민수 ( Min Su Ha ),김주승 ( Ju Seung Kim ),안홍대 ( Hong Dae Ahn ),박재찬 ( Jae Chan Par 대한내과학회 2013 대한내과학회지 Vol.85 No.3
Background/Aims: Endoscopic submucosal dissection (ESD) is a widely accepted method of treatment for early gastric cancer (EGC) without lymph node metastasis. However, there have been few studies about factors associated with local recurrence. The aim of our study was to evaluate the risk factors for local recurrence in patients with EGC after ESD. Methods: We retrospectively analyzed medical records of patients who underwent ESD of EGC at Gachon University Gil Medical Center. From February 2008 to July 2011, ESD for EGC was performed in 222 cases involving 214 patients. Patients with additional treatment after ESD, patients with recurred EGC, and patients with endoscopic follow-up of < 12 months were excluded. After exclusions, a total of 150 cases were included. Results: The mean age of the patients was 63.9 ± 9.8 years, and 74.3% were male. The en bloc resection rate was 139/150 (92.7%), and the complete resection rate was 131/150 (87.3%). Local recurrence at the ESD site was found in 5 cases (5/150, 3.3%) during a mean follow-up period of 24 months. In multivariate analysis, tumor involvement at the lateral resection margin [HR: 13.12 (1.19 - 145.10); p = 0.036], piecemeal resection [HR: 25.31 (1.24 - 517.57); p = 0.036], and lymphovascular invasion [HR: 485.06 (2.30 - 102449.79); p = 0.024] were associated with local recurrence after ESD. Conclusions: Local recurrence after ESD was significantly associated with involvement of the lateral resection margin, piecemeal resection, and lymphovascular invasion. Therefore, patients who have these risk factors should be followed up more carefully to detect local recurrence. (Korean J Med 2013;85:285-293)