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졸-겔 코팅법에 의한 티타늄과 스테인리스표면위의 무기질 내스크래치 보호막
김호형,김균탁,이흥렬,황태진 한국표면공학회 2009 한국표면공학회 학술발표회 초록집 Vol.2009 No.10
티타늄과 스테인리스 기판위에 졸-겔 코팅법으로 무기질 보호막을 형성하였고 기계적 특성을 테스트 하였다. 무기질 보호막은 금속 표면위에 졸-겔 코팅용액을 스프레이 코팅하여 제작하였다. 티타늄과 스테인리스 기판위에 적용한 무기질 보호막은 현저한 내스크래치성 향상을 보였다. 또한 실리카 나노입자의 첨가에 따른 무기질 보호막의 경도향상을 보였다. 그러나 실리카 나노입자가 2 wt% 이상 첨가됨에 따라 보호막의 경도가 감소함을 알 수 있었다
중증외상환자에서 알코올 섭취에 따른 중증도와 예후에 대한 연구
정호형 ( Ho Hyung Jung ),한상균 ( Sang Kyoon Han ),이성화 ( Sung Wha Lee ),박성욱 ( Sung Wook Park ),박순창 ( Soon Chang Park ),염석란 ( Seok Ran Yeom ),민문기 ( Moon Gi Min ),김용인 ( Yong In Kim ),류지호 ( Ji Ho Ryu ) 대한외상학회 2014 大韓外傷學會誌 Vol.27 No.4
Purpose: Alcohol ingestion is a significant risk factor for injuries. However, the influence of high blood alcohol concentration about the severe traumatic injury is controversial. The aim of study was to analyze the injury severity, prognosis in severe traumatic patients according to alcohol ingestion. Methods: This study was performed retrospectively with severe traumatic patients (Injury Severity Score≥16) who visited the emergency department at Pusan National University Hospital from January 2013 to December 2013. Results: In total 98 severe traumatic patients, blood alcohol concentration (BAC) positive group (BAC>30 mg/dl) is 42 (42.90%) patients and BAC negative group (BAC≤30 mg/dl) is 56 (57.10% )patients. Head and neck injury is significantly high in BAC positive group (35 patients, 83.3%) compared to BAC negative group (33 patients, 58.9%). Comparison of injury severity, outcome and mortality is not significantly different between two groups. Conclusion: In severe traumatic patients, head and neck injury occurred high in BAC positive group. Alcohol ingestion did not influence injury severity, outcome in severe traumatic patients. However, effort to decreasing injury related to alcohol ingestion and prospective multi-center study is needed. [ J Trauma Inj 2014; 27: 108-14 ]
이종무,김호형,D. H. Lee,홍순선 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Porous silicon (PS) with thin silver (Ag) coatings was prepared using a two-step method of electrochemical anodization of silicon followed by sputter-deposition of a silver film. The photoluminescence (PL) and the transmittance properties of the Ag/PS samples were evaluated by using PL spectroscopy and UV/VIS spectrometry, respectively. Fourier-transform infrared (FTIR) spectroscopy and X-ray photoelectron emission spectroscopy (XPS) analyses were also performed to investigate the origin of the PL enhancement caused by the Ag deposition. The PL intensity for the PS was increased by deposition of an Ag film. The optimum Ag lm thickness for enhancement of the PL from PS was 9.2 nm and the net increase in the intensity of the light emitting from the Ag-coated PS was about 78 %. FTIR and XPS analysis results suggest that the PL enhancement caused by Ag the film's deposition is attributed to a change in the bond structure from Si-H bonds to Si-Ag bonds and to an increase in the charge carrier concentration. The deterioration of the PL from the Ag-coated PS by thermal annealing is ascribed to coalescence of the PS layer.
홍찬석,김호형,김현우,이종무 대한금속·재료학회 2010 METALS AND MATERIALS International Vol.16 No.2
Optoelectronic devices based on porous silicon (PS) undergo substantial degradation in luminescence with aging due to atmospheric oxidation. The passivation of PS has been reported with a transparent conducting material or a semi-transparent metal. In this paper, we report enhancement of the photoluminescence (PL)of PS by the passivation of PS with ultrathin metal films such as silver (Ag), aluminum (Al), and gold (Au). It has been found that Ag and Au are respectively most and least effective in enhancing the PL of PS among those three different metals. The highest PL enhancing effect of Ag is mostly attributed to the high electrical conductivity of Ag, whereas the lowest PL enhancing effect of Au is due to the lowest optical transmittance of Au. The details of the PL enhancing effect of metal passivation are discussed with the aid of FTIR analysis results.