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비강내 누낭비강문합술시 시행한 양막충전술의 단기 임상 결과
최영재,황상준,이태수,Young Jae Choi,Sang Jun Hwang,Tae Soo Lee 대한안과학회 2008 대한안과학회지 Vol.49 No.3
`Purpose: To evaluate the short-term surgical results of Merocel? nasal packing wrapped with human amniotic membrane on the internal ostium during endonasal dacryocystorhinostomy (DCR). Methods: Sixty patients who underwent endonasal DCR to treat nasolacrimal duct obstruction from October 2005 to April 2006 were enrolled in this prospective study. The patients were divided into two groups: 30 patients treated with Merocel? packing wrapped with amniotic membrane were assigned to group 1, and the remaining 30 patients were assigned to group 2. During the follow-up period, the authors evaluated surgical wound healing, the incidence of granuloma, and the patency of the internal ostium. Results: Success rates at 6 months after surgery were higher in group 1 than in group 2, but these rates showed no statistically significant difference between the two groups (group 1: 93.3%, group 2: 86.7%, p=0.67). The time for mean wound healing in group 1 was significantly shorter than that in group 2 (group 1: 4.8±1.5 weeks, group 2: 7.3±1.5 weeks, p<0.001). The incidence of granuloma in group 1 was lower than that in group 2 at 2 months after surgery (group 1: 13% (4/30), group 2:33% (14/30), p=0.04). However, there was no difference of granuloma formation between the two groups at 6 months postoperatively (group 1: 33% (11/30), group 2: 46% (14/30)). Conclusions: The authors believe that the use of Merocel? packing wrapped with amniotic membrane after endonasal DCR might decrease postoperative inflammation, accelerate wound healing, and decrease granuloma formation in the early postoperative period.`
강구조 부재의 피로균열성장에 미치는 제인자에 관한 연구( II ) -표면잔류응력이 균열닫힘에 미치는 영향-
최영재,경갑수,Choi, Young Jae,Kyung, Kab Soo 한국강구조학회 1996 韓國鋼構造學會 論文集 Vol.8 No.3
To investigate the effect of fatigue crack growth due to the surface residual stress, it is measured the residual stress distribution by x-ray diffraction at the crack tip each constant crack growth in the notch specimens, and quantitively assessed the effect of crack closure caused to the distribution of compressive stress at the crack tip from evaluating crack openning stress using the finite element analysis. It is concluded that the degree of the residual stress distribution at the crack tip is decreased with increasing the crack length. From the fact that it is similar to the crack openning stress ratio, it is found that the compressive residual stress distribution and size is related to the crack closure effect and surface residual stress field with propagating crack in the notch specimens depends on the stress intensity factor range at the crack tip.
2000년대 국내 항공기 사고·준사고 발생유형 사례연구
최영재,안재형,유경인,박정권,Choi, Young-Jae,Ahn, Jae-Hyung,You, Kyung-In,Park, Jung-Gown 한국항공운항학회 2013 한국항공운항학회지 Vol.21 No.4
Since year 2001 to the present time, the aircraft accidents and serious incidents in our country have surpassed 150 occurrences. The Boeing has published the statistical summary of commercial jet airplane accidents annually for the past 10 years on the basis of the occurrence categories defined by the CICTT(CAST/ICAO Common Taxonomy Team), and the number of occurrences is in order of loss of control(LOC-I), controlled flight into terrain(CFIT) and runway excursion (RE). Like the NTSB and the EASA, when fatal and non-fatal accidents are aggregated, though fatality rate is low, abnormal runway contact(ARC), system/component failure(SCF-PP/NP), ground handling(RAMP) rank high in the CICTT occurrence categories. With the less occurrence frequency, it is difficult to statistically analyze the aircraft accidents in our country, thus customarily the accidents and the serious incidents on aggregate are consolidated, and the statistical analysis is performed. This study categorizes the accidents and serious incidents to the domestic transportation aircraft in the past 10 years according to the CICTT occurrence categories, that is compared with foreign practices, and the implications have been discussed. From years 2001 through 2010, the accidents to the domestic transportation aircraft occurred in order of system failure(SCF-NP), ARC and power plant failure(SCF-PP), and when the accidents and the serious incidents are consolidated and analyzed, it is verified that a distribution appears similar to the European accident occurrence categories defined from 300 accident occurrence data.
증식당뇨망막병증 환자에서 유리체절제술시 일상적인 내경계막제거술의 효과
최영재,김성우,오인경,오재령,허걸.Young Jae Choi. M.D.. Sung Woo Kim. M.D.. In Kyoung Oh. M.D.. Jaeryung Oh. M.D.. Kuhl Huh. M.D.. Ph.D. 대한안과학회 2008 대한안과학회지 Vol.49 No.4
Purpose: To evaluate the efficacy of internal limiting membrane (ILM) removal during vitrectomy in proliferative diabetic retinopathy (PDR) patients. Methods: Seventy-four eyes of 74 PDR patients who underwent vitrectomy were enrolled. All patients had been followed for at least one year. Thirty-three patients who underwent vitrectomy without ILM peeling from January 2004 to February 2005 were assigned to Group A and 41 patients who underwent vitrectomy with ILM peeling from March 2005 to October 2005 were assigned to Group B. Visual acuity (LogMAR), central macular thickness measured by optical coherent tomography (OCT), and presence or absence of macular edema were compared between the two groups at six months and one year after surgery. Results: Postoperative mean best corrective visual acuity (BCVA; LogMAR) were improved significantly in both groups at six months and one year after surgery. However, the overall amount of improvement in vision was not different between the two groups. The mean central forveal thickness in Group B was significantly thinner than in Group A at six months and one year after surgery. There was no difference between the two groups in macular edema incidence at that time. There were no serious complications in Group B by one year after surgery. Conclusions: There was no difference in visual acuity between the Group A and Group B However, the central forveal thickness measured by OCT was thinner in the ILM peeling group, and there were no serious complications in ILM peeling group. Routine ILM peeling during vitrectomy in PDR will help to maintain the structural stability of the macula postoperatively.
최영재(Choi, Young-Jae) 한국언론법학회 2016 언론과 법 Vol.15 No.3
이 연구는 한국의 뉴스통신 제도에서 국가기간뉴스통신사 형태의 공영뉴스통신사가 배태되는 역사적 연원을 추적하고, 그 과정에서 치열한 국익 경쟁이 전개되는 국제뉴스시장에서 국가정보 주권 수호 등이 공영뉴스통신사의 공적 책무로 부여되는 과정을 고찰함으로써 궁극적으로는 한국의 공영뉴스통신의 정체성을 드러내 보고자 했다. 한국의 공영뉴스통신 정체성의 연원은 군부독재정권에 의한 언론통폐합이 단행된 1980년 체제로까지 거슬러 올라간다. 당시 권위주의적 정권은 공영적 뉴스통신인 연합통신에 ‘전국 유일의 뉴스통신사’라는 독점적 지위를 부여하는 정책적 지원과 정부구독료 방식의 재정적 지원을 제공하는 대신, 국익과 공익 추구에 부응하는 공적 역할 수행의 책무를 요구했고, 그것은 공영뉴스통신의 정치적 종속이라는 부작용을 낳았다. 한국의 공영뉴스통신은 2000년대 들어 국력의 신장에 따른 국제뉴스시장에서의 국가정보주권 수호 등의 공적 역할을 부여받으면서 국가기간뉴스통신사라는 법적 지위를 받았지만, ‘1980년 체제’가 배태한 공영뉴스통신의 정치종속의 문제, 그리고 사영 뉴스통신과 경쟁에서 혼탁한 시장 질서 문제를 해결과제로 남겨두고 있다. 결론에서는 공영뉴스통신의 공적 역할과 책무 방안과 사영뉴스통신과의 시장경쟁 방안을 논의했다. This research explores the identity of public news agency in Korea, by reviewing the historical trace of formulating the public news agency institution, as the form of nation news agency in Korea, through which normative public roles, including the defense of national sovereignty of information, have been bestowed to the public news agency. The fomulation of the public news agency’s indentity have originated from the ‘1980 regime’, when military authoritative political regime forced diverse private news agencies to be merged into ‘the only one national news agency’, the Yonhap News Agency. Since then, the identity of the public news agency in Korea consists of performance of normative public role, in stead of having monopoly position in market. However around 2000, several private news agencies have entered into the hitherto public-dominant news agency market, then competitions in market and performance of public norm began to conflicting values for the public news agency.