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RIE 공정 조건에 의한 피라미드 구조의 블랙 실리콘 형성
조준환 ( Jun Hwan Jo ),공대영 ( Dae Young Kong ),조찬섭 ( Chan Seob Cho ),김봉환 ( Bong Hwan Kim ),배영호 ( Young Ho Bae ),이종현 ( Jong Hyun Lee ) 한국센서학회 2011 센서학회지 Vol.20 No.3
In this study, pyramid structured black silicon process was developed in order to overcome disadvantages of using wet etching to texture the surface of single crystalline silicon and using grass/needle-like black silicon structure. In order to form the pyramidal black silicon structure on the silicon surface, the RIE system was modified to equip with metal-mesh on the top of head shower. The process conditions were: SF6/O2 gas flow 15/15 sccm, RF power of 200 W, pressure at 50 mTorr~200 mTorr, and temperature at 5℃. The pressure did not affect the pyramid structure significantly. Increasing processing time increased the size of the pyramid, however, the size remained constant at 1 μm~2 μm between 15 minutes~20 minutes of processing. Pyramid structure of 1 μm in size showed to have the lowest reflectivity of 7 %~10 %. Also, the pyramid structure black silicon is more appropriate than the grass/needle-like black silicon when creating solar cells.
표대승 ( Dae Seong Pyo ),조준환 ( Jun Hwan Jo ),홍표환 ( Pyo Hwan Hong ),이종현 ( Jong Hyun Lee ),김봉환 ( Bong Hwan Kim ),조찬섭 ( Chan Seob Cho ) 한국센서학회 2013 센서학회지 Vol.22 No.6
In this paper, we found surface shapes are affected by several parameters of RIE, such as RF power, pressure, temp, and process times. The reflectance of pyramid and half sphere structures show differences among shapes, size, height, and depth of those structures. We made about 1㎛ pyramid and half sphere shapes of silicon surface with RIE. For comparing the reflectance, pyramid and half sphere structures are fabricated with same height. Pyramid structure cell shows higher cell efficiency of 12.5% by 1.1% than one of half sphere structure of 11.4%. The light absorption is more increased through the pyramid structure than half sphere structure.
TNF-α 억제제 사용 후 비장 결핵이 발생한 류마티스관절염 환자의 Rituximab 치료
김진수 ( Jin Su Kim ),최정란 ( Jung Ran Choi ),송정수 ( Jung Soo Song ),김경준 ( Kyung Joon Kim ),박윤수 ( Youn Su Park ),조준환 ( Jun Hwan Cho ),한민지 ( Min Jee Han ),최상태 ( Sang Tae Choi ) 대한류마티스학회 2013 대한류마티스학회지 Vol.20 No.2
One of the most important adverse effects of a tumor necrosis factor (TNF)-α inhibitor is the reactivation of tuberculosis. Most of them occur in the lung, but sometimes they can be found in other organs. Moreover, the proper management of active rheumatoid arthritis (RA) in patients with anti-TNF-α associated tuberculosis is still in debate. We present the case of a seropositive RA patient who showed good response with rituximab, an anti-CD20 monoclonal antibody, after developing splenic tuberuculosis, following treatment with TNF-α inhibitor. Confirming a diagnosis of splenic tuberculosis is difficult and can be delayed due to its nonspecific symptoms and rare occurrence. This case suggests that splenic tuberculosis should be doubted in RA patients treated with TNF-α inhibitor, and that rituximab may be considered as an alternative treatment option in RA patients with anti-TNF-α associated tuberculosis.
식도 정맥류에 대한 내시경적 정맥류 결찰 요법의 임상적 고찰
이재동,조준환,곽성진 대한소화기내시경학회 1994 Clinical Endoscopy Vol.14 No.4
The endoscopic variceal ligation(EVL) has been adopted as a new treatment for acute hemorrhage from esophageal varices that ranks the highest mortality rate in upper gastrointestinal tract bleedings. This treatment method has good effects for the urgent treatment and eradication of varices from acute variceal bleeding in repeated sessions. We enrolled 34 patients with an acute or chronic variceal bleeding episode at the time of admission in this study from Apr. 8, 1992 to June. 2, 1994. Among 34 patients, there were 31 males and 3 females, at ages between 45-66(mean: 52 years). The incidence of symptoms on admission was 10 in tarry stool, 9 in hematemesis 8 in ascites, 4 in hepatic encephalopathy and 3 in nonspecific symptoms. Varices were eradicated or reduced to grade I in 30(88.2%) of the 34 patients by 4-25 bands (mean: 10.8 bands) in 1-7 EVL sessions(mean: 3.1 sessions). After EVL, there are complicated by active bleeding in 3 patients, dysphagia in 3 patienta and transient chest discomfort in 5 patients but subsided during 24 hours. These results indicated that EVL is a safe method for treatment of bleeding from esophageal varices.