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기체레이저의 여기를 위한 용량결합고주파(ccrf) 방전시스템
최상태,Choi, Sang-Tae 한국조명전기설비학회 2006 조명·전기설비학회논문지 Vol.20 No.1
용량결합고주파(ccrf)방전은 홀로우음극방전이나, 직류방전에 비해서 방전관의 구조가 간단하고 균질한 플라즈마를 발생시키는 장점을 가지고 있다. 본 논문에서는 ccrf-방전을 기체레이저의 여기에 적용하기 위한 목표를 가지고 방전시스템을 선계, 제작하여 연속운전의 균질한 방전을 실현하였다. 13.56[MHz]의 rf-전력을 방전 내부로 효율적으로 결합하기 위해서 내부직경 5[mm]의 레이저방전관에 특수하게 제작된 rf-전극을 사용하였다. 또한 방전관의 임피던스가 rf-발생기의 풀력저항 50[$\Omega$]에 정합을 이루는 임피던스 정합회로를 개발하였다. The ccrf-discharge has in comparison with the hollow-cathode discharge and DC-discharge some advantages: Simple design of the tube and homogeneous plasma. The ccrf-discharge was researched with the goal, to use on the excitation of the gas laser. In this work a rf-exciting system was planned and developed. With it a homogeneous discharge was produced in the cw operation. To supply the rf-power with the frequency 13.56[MHz] effectively in the discharge, laser tube were used with inner diameter of 5[mm] and the specially developed rf-electrodes. A matching circuit was composed also. Thereby the impedance of the discharge tube was adjusted to the 50[$\Omega$] output resistance of the rf-source.
DC 중첩형 CCRF 여기 헬륨-아연방전에서 자외선 250.199nm의 광이득 특성 연구
최상태(Sang Tae Choi) 한국조명·전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.7
On 250.199nm uv-line, witch has the potential to emit as a laser line, from a ccrf-excited He-Zn discharge with overlapped DC was carried out optimization of the discharge parameters and measurement of the optical gain. In this study the optical gain of the 250.199nm uv-line has been optained 4% for the first time. At a rf-power of 400W with the frequency 13.56MHz the optimal He-pressure indicated 2kPa.
최상태(Sang-Tae Choi) 한국조명·전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.1
직류방전이 추가로 인가된 용량결합고주파(CCRF)여기에 의한 아연증기레이저에서 6개의 레이저선들이 방출되었다. 이들의 파장은 491.162[㎚]와 492.403[㎚]의 청색선과 589.433[㎚]의 오렌지선 그리고 747.879[㎚], 758.848[㎚], 3.25[㎚]의 적외선 영역에 분포되어 있다. 최적의 레이저운전을 위해서 방전파라미터들이 결정되었다. 13.56[㎒]의 고주파전력 400[W]에서 오븐온도 780~800[K], 헬륨압력 3.5~5.5[㎪] 최적화 되었다. From a CCRF-excited zinc vapour laser with overlapped DC-discharge were emitted following 6 laser lines: two blue at 491.162[㎚] and 492.403[㎚], an orange at 589.433[㎚] and three infrared lines at 747.879[㎚], 758.848[㎚] and 773.25[㎚]. The discharge parameters were determined for an optimal laser operation. At a RF-power of 40[W] with the frequency 13.56[㎒] the optimal temperature of the oven lay between 780[K] and 800[K], the He-pressure between 3.5[㎪] and 5.5[㎪].
최상태(Sang-Tae Choi) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.7
A spectroscopic measuring system was developed in order to determine optical gain of gas laser discharge for any optical transitions between 190[nm] and 800[nm] without laser resonator. With an image optical system and a feedback optical system emission light of laser discharge are entered in a monochromator and received at a photomultiplier. Subsequently optical gain and line intensity are measured.
반복적인 투침으로 인해 인조혈관과 자가 정맥 사이에 발생한 의인성 동정맥루 환자들에서의 임상적 특징
최상태(Sang Tae Choi),김건국(Keon Kuk Kim),이운기(Woon Ki Lee),이정남(Jung Nam Lee),강진모(Jin Mo Kang),백정흠(Jeong-Heum Baek),이원석(Won Suk Lee),서우형(Woo Hyung Seo) 대한외과학회 2010 Annals of Surgical Treatment and Research(ASRT) Vol.78 No.1
Purpose: Failure of hemodialysis access is the main medical problem in chronic renal failure patients. This resulted from complications such as thrombosis, infection, pseudoaneurysm, steal syndrome and so on. This study was undertaken in an attempt to describe the clinical characteristics and significances of dialysis failure due to iatrogenic fistula between prosthetic graft and native vein at puncture site. Methods: During 5 years between Feb. 2005 and Feb. 2009, five Iatrogenic fistulas were identified in a retrospective review of 133 patients performed 220 times fistulography due to dialysis failure in PTFE (polytetrafluoroethylene) graft. Results: Overall incidence is 3.8 % in PTFE graft cases. Mean age is 50 (28~75) years, male to female ratio 2:3. Median 1st patency period is 20 months (6~36). All iatrogenic fistula is usually located in not venous but arterial limb of forearm loop, combined with the stenosis in venous limb and anastomosis site. More than 70% venous anastmotic stenosis in 4 cases (80%) and diffuse stenosis of venous limb in 3 cases (60%), revised concomitantly either by patch angioplasty or ballooning. Medial follow-up period is 8 months (5~12), graft occlusion occurred in one case. Conclusion: All iatrogenic fistula usually occurs in not venous but arterial limb of forearm loop graft. Most iatrogenic fistula is combined with the stenosis in venous limb and anastomosis sites, must be revised concomitantly either by patch angioplasty or ballooning. Close assessment to superficial vein and graft is needed for early detection. Fistulography is the most useful diagnostic tool. Careful cannulation method is required to prevent the occurrence of iatrogenic fistula in chronic renal failure patients.