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Effects of Electron Irradiation on the Properties of ZnO Thin Films
김승홍,김선경,김소영,김대일,최대한,이병훈,김민규 한국전기전자재료학회 2013 Transactions on Electrical and Electronic Material Vol.14 No.4
ZnO films were deposited on glass substrates by radio frequency (RF) magnetron sputtering and exposed to intense electron beam irradiation to investigate the effects of electron irradiation on the properties of the films. Although all of the films had ZnO (002) textured structure regardless of electron irradiation, the grain sizes of the films decreased with electron irradiation. Surface roughness also depended on electron irradiation. The surface roughness varied between 2.3 and 1.6 nm, depending on the irradiation energy. Based on photoluminescence (PL) characterization,the most intense UV emission was observed from ZnO films irradiated at 900 eV. Since the intensity of UV emission is dependent upon the stoichiometric of ZnO films, we conclude that 900 eV was the optimum electron irradiation energy to achieve the best stoichiometric of ZnO films in this study.
김승홍,김한구 중앙대학교 의과대학 의과학연구소 2003 中央醫大誌 Vol.28 No.1
Traffic accidents are on an increasing trend and the patients associated with accident are also increasing alarmingly. But, there is room for debate in appropriate compensation and treatment for post-accident injury. The objective of this article is to present primary treatment of accident injury, posttraumatic scar revision, and appropriate presumption of operative fee. It is not mandatory for all the patient, but we believe that this will be a very useful recommendation to estimate compensation.
확장된 가토피부의 경피산소분압 및 피판생존에 관한 실험적 연구
이상목,윤병일,김승홍 大韓成形外科學會 1989 Archives of Plastic Surgery Vol.16 No.5
Tissue expansion is a new clinical technique of providing donor tissue in modern reconstructive surgery. This technique is an alternative in reconstruction by providing tissue of the same color, texture, similar thickness, sensation with minimal scar formation, and minor donor site morbidity. An increase in vascularity, as well as vasodilatation, was seen in the angiograms of skin that was expanded. This increase in vascularity is undoubtedly important in the augmented survival found in the flaps elevated in the expanded tissue. The purpose of this study is to investigate the changes of transcutaneous PO₂ and viability of expanded skin flaps. In this study with a modified Clark-type transcutaneous PO₂ monitoring equipment, transcutaneous PO₂ of the expanded skin flaps and undelayed flaps were measured in10 rabbits. And then the flap survival rates of expanded skin flaps were compared with those of undelayed flaps. The following results were obtained; 1. The mean transcutaneous PO₂ of the normal rabbit skin was 55.75±6.17 mmHg. 2. The mean transcutaneous PO₂ of the flap was 26.55??5.06 mmHg in the undelayed group and 36.65±5.67 mmHg in the expanded group. Being compared with preoperative level, postoperative mean transcutaneous PO₂ of the flap was 47.45±5.13% in the undelayed group and 65.65±7.01% in the expanded group respectively. The mean transcutaneous PO₂ of the flap in the expanded group was about 38% higher than that of the undelayed group. 3. The mean skin flap surviving area was 46.20±7.13% in the undelayed group and 62.20±7.03% in the expanded group.
백서에서 임의형 국소 피판 처치 후 실리콘 박판을 이용한 드레싱의 효과에 대한 조직학적 연구
민대홍,김미경,이기룡,조철현,김승홍 大韓成形外科學會 1994 Archives of Plastic Surgery Vol.21 No.3
Silicone gel sheet is elastic, controls evaporative water loss, and conforms to wound surface. This property provide proper pressure on the flap, moist wound environment and effective bacterial barrier, therefore it is effective for wound healing process and scar formation on the incised bed. The purpose of our study is to evaluate the effect of silicone gel sheet dressing in the process of wound healing and scar formation on skin flap in rat by comparing with histologic findings and thickness of scar of conventional dry gauze dressing control group. In 36 rats, the skin flaps were elevated on both sides of back and sutured to their original sites. On left side the silicone gel sheet dressing was applied as an experimental group, and on right side, conventional dry gauze dressing was applied as a control group. We compared the histlogic findings between two groups by observing for changes in contact surface of flap with wound bed at 3rd, 7th and 15th postoperative day and measured thickness of scar at 15th postoperative day respectively. The histologic findings include inflammatory cell infiltration, vascular ingrowth, appearance of fibroblast, collagen synthesis. As a result, the experimental group showed that less inflammatory cell infiltration, more abundant capillary ingrowth and the large amount of fibroblast production and collagen synthesis and less scar formation than the control group. With the above results, we concluded that silicone gel sheet dressing can promote wound healing processes and help early safe flap 'take' and it can decrease scar formation in the contact surface of flap on the wound bed.