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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.`
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.
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.
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.
다중지능이론에 기초한 과학수업활동이 초등학새의 창의성과 과학탐구능력에 미치는 영향
최영재 ( Young Jae Choi ),김주영 ( Joo Young Kim ) 서울교육대학교 초등교육연구원 2002 한국초등교육 Vol.13 No.2
다중지능이론에 기초한 과학수업활동이 초등학새의 창의성과 과학탐구능력에 미치는 영향 Effects of Science Instruction based on Multiple Intelligence Theory On the Creativity and Science Inquiry Ability of Elementary School Students
순환 신경망 모델에 따른 재실 인원 예측모델 개발 및 성능비교
최영재(Choi, Young Jae),박보랑(Park, Bo Rang),현지연(Hyun, Ji Yeon),문진우(Moon, Jin Woo) 대한건축학회 2022 대한건축학회논문집 Vol.38 No.10
An accurate occupancy prediction is essential for occupant-centric control (OCC) that saves energy while providing a comfortable indoor environment. Various machine learning-based approaches are being tried to develop an occupancy prediction model. Among these approaches, the performance of the recurrent neural network (RNN) based models, showed strength in time series forecasting and were found to be superb. However, studies related to performance comparison between RNN based models are insufficient; although the model performance had possibility for improvement through optimization. Therefore, in this study the RNN, long short-term memory (LSTM), and gated recurrent unit (GRU) models were developed to predict the number of occupants after 15, 30, and 60 minutes. The optimal models for each prediction horizon were derived through optimization and performance evaluation. As a result, the GRU model presented the best performance. The root mean squared error (RMSE) and mean absolute error (MAE) of the prediction model after 15 minutes was 0.8073, 1.5301, the prediction model after 30 minutes was 1.2841, 2.3386, and 2.0769, 3.3685, for the prediction model after 60 minutes. These results show superior performance compared to the existing RNN based models and signify that it is possible to provide accurate values for various prediction horizons. Thus, if outlier supplementation and addition of the adaptation function are implemented through an algorithm in the future, the developed models are expected to be utilized as a key element for OCC.
손 동작 상호작용을 이용한 가상 화재안전 교육에 관한 연구
최영재(Yeongjae Choi),권승준(Seungjun Kwon) 한국정보기술학회 2021 Proceedings of KIIT Conference Vol.2021 No.11
본 논문에서는 가상환경을 이용한 화재안전 교육에서 몰입감 있는 체험자-가상환경 상호작용을 위해 HMD에 내장된 카메라로 취득된 영상 기반의 손 동작 상호작용 구현 기술에 대한 방법을 제안한다. 제안된 시스템은 DNN기반 MLP로 구현된 사용자 손 모양 인식기와 FSM기반 손 제스처 인식기를 통해 손 동작 상호작용을 제공한다. 시스템이 제공하는 손 동작 상호작용은 Unity 기반의 가상 화재안전 교육 서비스에 적용되어 가상 화재안전 교육 콘텐츠 내에서 체험자의 공간이동 기능과 가상객체조작 기능으로 적용되었다. In this paper, we propose hand gesture-based interaction using HMD-embedded camera which provides immersive interaction between user and virtual objects in virtual fire safety education system. The proposed interaction system consists of DNN-based MLP hand pose recognizer and FSM-based hand gesture recognizer. The interaction system is integrated into the Unity-based virtual fire safety education service as a user movement function and virtual object manipulation function.