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김경호,조성익,이재식,원광연,Kim, Kyong-Ho,Cho, Sung-Ik,Lee, Jae-Sik,Wohn, Kwang-Yun 한국시뮬레이션학회 2009 한국시뮬레이션학회 논문지 Vol.18 No.4
Navigation system providing route-guidance and traffic information is one of the most widely used driver-support system these days. Most of the navigation system is based on the 2D map paradigm so the information is ed and encoded from the real world. As a result it imposes a cognitive burden to the driver to interpret and translate the ed information to real world information. As a new concept of navigation system, augmented-reality navigation system (AR navigation) is suggested recently. It provides navigational guidance by imposing graphical information on real image captured by camera mounted on a vehicle in real-time. The ultimate goal of navigation system is to assist the driving task with least driving workload whether it is based on the abstracted graphic paradigm or realistic image paradigm. In this paper, we describe the comparative studies on how map navigation and AR navigation affect for driving tasks by experimental research. From the result of this research we obtained a basic knowledge about the two paradigms of navigation systems. On the basis of this knowledge, we are going to find the optimal design of navigation system supporting driving task most effectively, by analyzing characteristics of driving tasks and navigational information from the human-vehicle interface point of view.
황반부 망막전막 환자에서 내경계막 제거 후 발생한 시야 결손
김경호,이지웅,이지은,엄부섭,Kyong Ho Kim,Ji Woong Lee,Ji Eun Lee,Boo Sup Oum 대한안과학회 2011 대한안과학회지 Vol.52 No.3
Purpose: To report a case of visual field defect developed after internal limiting membrane (ILM) peeling in a patient with macular epiretinal membrane (ERM). Case summary: A 33-year-old female without a history of specific diseases presented with a gradually decreased visual acuity in the right eye for 3 years. The patient was diagnosed as having macular ERM and underwent vitrectomy. During ILM peeling, retinal hemorrhage occurred in the superior region of macula, which spontaneously disappeared 2 weeks after surgery. Transmission electron microscopy showed Müller cell end feet with damaged appearance adherent to the ILM. At 3 months after surgery, the patient developed retinal nerve fiber layer (RNFL) defect in the area where the spot retinal hemorrhage had occurred. Optical coherence tomography showed focal RNFL thinning in the superotemporal region. The automated perimetry revealed corresponding inferior nasal step and scotomas in the right eye. Intraocular pressure was normal throughout the follow-up period and there was no evidence of glaucomatous optic disc change. Conclusions: The results obtained from the patient in the present study indicated that visual field defect may be the result of a mechanical damage to the RNFL during ILM peeling. J Korean Ophthalmol Soc 2011;52(3):378-384
김경호(Kyong Ho Kim),정재우(Jae Woo Jung),박성후(Sung Who Park),변익수(Ik Soo Byon),이지은(Ji Eun Lee) 대한안과학회 2015 대한안과학회지 Vol.56 No.12
목적: 크기가 큰 황반원공의 수술적 치료로서 내경계막 자가이식술을 시행한 환자 5명의 수술방법과 결과를 알아보고자 한다. 대상과 방법: 크기가 400 μm 이상인 큰 황반원공 환자를 대상으로 유리체절제술을 시행하고 0.025% Briliant blue G로 내경계막을 염색하였다. 원공 주변의 내경계막을 약 2.5 유두직경의 크기로 벗겨낸 뒤, 원공 속에 내경계막 절편을 이식하고, 추가적으로 약 1.5 유두직경 정도의 내경계막을 더 제거하였다. 액체공기교환을 하고 가스를 충전하였다. 수술 후 빛간섭단층영상으로 원공 폐쇄를 조사하였다. 결과: 5안의 평균 나이는 65.0 ± 11.8 (52-77)세였다. 평균 수술 전 교정시력(logMAR)은 0.80 ± 0.27이었고, 평균 구면대응 굴절값은 -2.0 ± 2.2디옵터였다. 원공 크기는 평균 수평직경 701.4 ± 129.4 μm, 수직 직경 630.2 ± 202.8 μm였다. 기저부는 1,043.4 ± 225.0 μm, 높이는 464.4 ± 218.9 μm였다. 4안은 수술 후 1일째, 1안은 수술 후 4-7일 사이에 원공이 완전히 폐쇄되었다. 경과관찰기간 동안 중심와의 해부학적 모양은 더욱 개선되었다. 2안에서는 시력호전이 되었으나, 3안은 술 전과 차이가 없었다. 결론: 내경계막 자가이식술을 통해 수술 후 빠른 기간에 성공적인 원공의 폐쇄를 얻을 수 있었다. 크기가 큰 황반원공에서 시행해 볼 만한 유용한 수술 술기라고 생각한다 Purpose: To evaluate the surgical outcome of autologous transplantation of internal limiting membrane (ILM) for the treatment of large macular hole. Methods: Twenty-five gauge pars plana vitrectomy was performed for the treatment of patients with full thickness macular hole larger than 400 μm. ILM was stained using 0.025% brilliant blue G. ILM around the hole was circumferentially peeled as large as 2.5 disc diameter (DD) in size and then transplanted inside the hole. ILM was peeled out additionally approximately 1.5 DD in size. Fluid-air exchange and gas injection were performed. After surgery, the hole was scanned using spectral domain optical coherence tomography. Results: A total of 5 eyes were included in the present study. The mean age was 65.0 ± 11.8 years (52-77) and mean best corrected visual acuity (log MAR) was 0.80 ± 0.27. The mean refractive error was -2.0 ± 2.2 diopter, mean horizontal size of hole was 701.4 ± 129.4 μm, mean vertical size was 630.2 ± 202.8 μm, mean hole base size was 1,043.4 ± 225.0 μm and hole height was 464.4 ± 218.9 μm. At the first day after surgery, transplanted ILM was detected inside the hole in all 5 eyes and complete closure of the hole occurred in 4 eyes. One hole was closed between postoperative days 4 and 7. Foveal contour improved gradually but photoreceptor integrity did not during the follow-up period. Two eyes showed visual improvement but 3 did not after surgery. Conclusions: Macular hole was closed successfully and quickly using the autologous ILM transplantation technique. Based on our results, the autologous ILM should be considered the treatment of choice for large macular holes.