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화학습식공정법을 이용한 용액 농도 및 시간에 따른 ZnS 완충층 특성에 대한 분석
손경태,김종완,김민영,신준철,조성희,임동건,Son, Kyeongtae,Kim, Jongwan,Kim, Minyoung,Shin, Junchul,Jo, Sunghee,Lim, Donggun 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.5
In this study, chemical bath deposition method was used to grow Zinc sulfide(ZnS) thin films from $NH_3/SC(NH_2)_2/ZnSO_4$ solutions at $90^{\circ}C$. ZnS thin films have been prepared onto ITO glass. The concentrations of $ZnSO_4$ and $NH_3$ were varied while the concentration of Thiourea was fixed in 0.52 M. Structural, optical, electrical characteristic of ZnS thin films were measured. The physical and optical properties of different ZnS thin films were influenced severely by the concentration of the two reacting chemicals. The optimal concentration of $ZnSO_4$ and $NH_3$ was 0.085 M and 1.6 M, respectively.
CIGS 박막 태양전지의 조성 최적화를 통한 셀 특성 개선
손경태,김민영,신준철,조성희,양계준,임동건 한국교통대학교 2014 한국교통대학교 논문집 Vol.49 No.-
Cu(In,Ga)Se2 (CIGS) thin films were fabricated with varying Ga and Cu compositions. Ga/(In+Ga) were varied between 0.1 and 0.41. Cu/(In+Ga) were varied between 0.4 and 0.97. Solar cells were fabricated by co-evaporation using the CIGS layers as absorbers. The influence of composition on the CIGS layer structural, chemical properties were studied. The CIGS thin films were characterized by scanning electron microscopy, energy-dispersive spectroscopy. Grain size in the films increased with increasing Cu composition. At a Cu/(Ga+In) of 0.85 and Ga/(In+Ga) of 0.33, CIGS layer has the optimized contents with Cu 23.88 at%, In 18.05 at%, Ga 9.01 at% and Se 49.06 at%. Optimizing the compositions of CIGS layer resulted in a CIGS solar cell with an efficiency of 13.61%.
투명 전도막 개선을 통한 CIGS 박막태양전지 효율 향상
김민영,손경태,조성희,신준철,임동건,양계준 한국교통대학교 2014 한국교통대학교 논문집 Vol.49 No.-
In this study, sputtering method was used to grow Ga-dopes ZnO films on a CIGS absorber layer, in order to examine the effect of TCO on properties of CIGS solar cell devices. Structural, electrical and optical properties were investigated by varied thickness of Ga-dopes ZnO films. Also, relation to the application as a window layer in CIGS thin film solar cell were studied. It was found that the electrical and structural properties of ZnO:Ga film improved with increasing its thickness. However, the optical properties degraded. Jsc of the fabricated CIGS based solar cells was significantly influenced by the variation of the ZnO:Ga window layer thickness. Because ZnO:Ga window layer is one of the Rs factors in CIGS solar cell. Rs has the biggest influence on efficiency characteristic. In order to obtain high efficiency of CIGS solar cell, ZnO:Ga window layer should be fabricated with electrically and optically optimized.
투명 전도막 개선을 통한 Cu(In<sub>x</sub>,Ga1<sub>-x</sub>)Se<sub>2</sub> 박막태양전지 효율 향상에 관한 연구
김기림,손경태,김민영,조성희,신준철,임동건,Kim, Kilim,Son, Kyeongtae,Kim, Minyoung,Shin, Junchul,Jo, Sunghee,Lim, Donggun 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.4
In this study, Sputtering method was used to grow Al-dopes ZnO films on a CIGS absorber layer, in order to examine the effect of TCO on properties of CIGS solar cell devices. Structural, electrical and optical properties were investigated by varied thickness of Al-dopes ZnO films. Also, relation to the application as a window layer in CIGS thin film solar cell were studied. It was found that the electrical and structural properties of ZnO:Al film improved with increasing its thickness. However, the optical properties degraded. Jsc of the fabricated CIGS based solar cells was significantly influenced by the variation of the ZnO:Al window layer thickness. Because ZnO:Al window layer is one of the Rs factors in CIGS solar cell. Rs has the biggest influence on efficiency characteristic. In order to obtain high efficiency of CIGS solar cell, ZnO:Al window layer should be fabricated with electrically and optically optimized.
골반골 치골지 골절의 동반손상에 관해서 : 컴퓨터 단층촬영의 필요성 The Role of Computerized Tomography
이충길,권진우,손경태,신승호,박준욱 대한골절학회 1999 대한골절학회지 Vol.12 No.1
Pelvic fractures in general can be divided into two major types, based on the amount of energy involved: low-energy mechanisms are usually fractures of individual bones of the pelvic ring and high-energy mechanisms results in more severe injury to the pelvic ring, generally producing pelvic ring disruption. Pelvic fractures resulting from low-energy mechanism are usually fractures of individual bones of the pelvic ring that do not damage the true integrity of the ring structure. These include avulsion fractures, isolated fractures of the sacrum, and iliac wing fracture. Computerized tomography permits confirmation of findings noted on plain film and delineates injury to the posterior ring. It facilitates subclassifying the fracture according to degree of severity, as in the Young classification. The purpose of this study is to evaluate the role of CT, which is to identify the combined injuries of pubic ramus fractures. The sacrum impacted fracture and sacroiliac joint injury are often unidentified and diagnosed as an isolated fracture to the pubic ramus. The 42 cases of pubic ramus fractures on conventional radiography were simultaneously performed CT from June 1996 to February 1998. The results of associated injuries were as follows. 1. In 34 cases (81%) posterior pelvic ring injuries (sacral fractures 28 cases, anterior sacroiliac joint widening 6 cases) were observed. 2. CT was very useful to diagnose the posterior pelvic injury and to determine the mechanisms of injury.
이충길,권진우,손경태,신승호,이우세 대한슬관절학회 1997 대한슬관절학회지 Vol.9 No.1
Local anesthesia for arthroscopic procedure of the knee is an increasingly popular technique that avoids the use of general anesthesia and the associated risks of respiratory depression, aspiration, and postoperative sedation. Many authors, for example McGinty etc., Martin, Yoshiya etc., advocated local anesthesia as safe and efficient method for arthroscopic procedures of the knee. We performed arthoroscopy of the knee under local anesthesia on 150 patients for diagnostic and operative purposes between January l993 and December l996. The technique of local anesthesia that we used was that 20cc of 0.5%; bupivacaine with 1:200,000 epinephrine was injected into superolateral portal of the knee joint and additional 10-20cc ot 1% lidocaine into the arthroscopic portals. Pnevmatic tourniquet was not applied in all cases. We analysed the 150 cases and the results were as follows; The diagnostic arthroscopy was performed in 50 cases and the operative arthroscopy was in 100 cases. The duration of local anethesia was from 4 hours to 12 hours, with an average of 6 hours. In 35 cases arthroscopy was performed as outpatient procedure and average hospital stay excluding other problem was 5 days. No complication related to systemic toxicity by local anesthetics was observed. Conclusively arthroscopy of the knee under local anesthesia is safe and effective procedure to avoid the risks of general anesthesia but patients selection is very important.
골수강내 금속정을 이용한 경골 근위간부 골절치료의 문제점
김재일,권진우,손경태,신승호 대한골절학회 1999 대한골절학회지 Vol.12 No.1
Proximal shaft fractures of the tibia have a high incidence of complication and often result in poor outcomes. Plate fixation and locked intramedullary nailing are the most common methods of treatment, but now the latter is more popular because of soft tissue problem, osteomyelitis etc.. The purpose of this study is to evaluate the results of locked intramedullary nailing in the treatment of proximal shaft fractures of the tibia and to draw a conclusion that what type of fracture patterns are the appropriate indication of nailing. We analyzed 18 proximal shaft fractures of the tibia which were treated by locked intramedullary nailing from October 1991 to March 1997 and followed more than 12 months. The results were as follows; The complications were occurred in 12 cases(66.6%); 4 cases of delayed or non-union, 8 of angular deformity, 1 of leg length discrepancy. Delayed or non-unions were caused by fracture site comminution and bone defect. 5 anterior angular deformities were due to the pulling of the knee extensor mechanism and 3 valgus deformities were due to medially located entry portal. In conclusion, since locked intramedullary nailing in proximal tibial fractures causes a high incidence of complications, it is recommended in transverse or undisplaced fractures. And plate fixation and bone graft will be recommended in comminuted or displaced oblique fractures, if soft tissue condition is permitted.
Bent Semitubular Plate 를 이용한 상완골 근위부 골절의 치료
이충길,권진우,손경태,신승호,김완업 대한골절학회 1997 대한골절학회지 Vol.10 No.3
There is no consensus on the best way to treat complicated fractures of the proximal humerus. Open reduction and internal fixation with plate is one of the most popular method, but it has several disadvantages. Thus we used bent semitubular plates to fix the proximal humeral fractures, which were reported by Szabo and Sehr, Moda etc.. This method provided relatively firm fixation and then early ROM exercise was possible even in case of osteoporotic or severely comminuted fractures. We treated 9 cases of proximal humerus fractures which were with bent semitubular plates from January 1992 to June 1996 and followed up more than 6 months. The following results were obtained.: 1. The bent semitubular plate fixation was useful method even in treatment of comminuted or osteoporotic proximal humerus fractures. 2. The mean duration of radiologic bone union was postoperative 10 weeks. 3. Complications developed in 2 cases; one case was plate failure and the other was humeral head penetration by blade portion. 4. According to Neer criteria 5 cases were excellent, 2 cases satisfactory, l case unsatisfactory and 1 case failure.