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심부 각막 궤양 및 천공 환자에서 시행한 다섯 겹 강화형 양막 이식술
오두환,권민석,김재찬,Doo Hwan Oh,Min Seok Kwon,Jae Chan Kim 대한안과학회 2011 대한안과학회지 Vol.52 No.10
Purpose: To evaluate the efficacy of five-layered reinforced amniotic membrane (AM) transplantation for treating deep corneal ulcer or perforation. Case summary: We performed a five-layered reinforced AM transplant in three cases of corneal ulceration or perforation using mechanical compressed lyophilized AMs. In all cases, the perforated cornea healed with re-epithelization within 2 weeks and the ocular surface was stabilized for more than 1 year. Conclusions: Five-layered reinforced AM transplantation may be an alternative method for treating deep corneal ulcers or perforations. J Korean Ophthalmol Soc 2011;52(10):1232-1237
오두환,김재찬,전연숙,Doo Hwan Oh,Jae Chan Kim,Yeoun Sook Chun 대한안과학회 2010 대한안과학회지 Vol.51 No.4
Purpose: To report a case of drug-resistant Fusarium deep keratitis following sclera graft. Case summary: A 48-year-old woman, who underwent excision of the pterygium nine years previous, received a scleral graft for scleromalacia and ocular pain. After surgery, due to melting of the scleral graft and the presence of Fusarium deep keratitis, she received surgical and intensive medical treatment including three intracameral injections of antifungal agent, administration of topical voriconazole 1%, scleral re-graft, autologous conjunctival graft, and amniotic membrane transplantation. Nevertheless, the patient’s ocular condition deteriorated with increased hypopyon, corneal opacity, and perforation. Enucleation was ultimately performed. J Korean Ophthalmol Soc 2010;51(4):606-610
사체와 전산화 단층촬영을 이용한 깊은 안와 외벽의 수술적 해부구조
오두환,이정규,Doo Hwan Oh,Jeong Kyu Lee 대한안과학회 2011 대한안과학회지 Vol.52 No.8
Purpose: We investigated the surgical anatomy of the deep lateral orbital wall via dissection of Korean cadavers and analysis of the orbit in normal adults using computed tomography. Methods: Twelve cadavers were used to determine the exact anatomic index of the orbital lateral wall, and computed tomography images of 20 patients were used for surgical anatomic measurements during deep lateral orbital wall decompression. Additionally, the anatomic indexes measured in the cadavers and in the computed tomography study were compared and analyzed. Results: In the cadaver study, the mean distance from the orbital rim to the end of the superior orbital fissure was 36.7 ± 1.98 mm, to the rim of the frontosphendoial suture was 18.2 ± 1.92 mm, and from the end of the superior orbital fissure to the inferior orbital fissure was 17.1 ± 1.19 mm. In the computed tomography study, the mean value from the orbital rim to the end of the superior orbital fissure was 39.2 ± 2.46 mm, and from the rim to the frontosphenoidal suture was 17.8 ± 1.56 mm. Conclusions: The present study regarding the surgical index of the lateral orbital wall in Koreans will assist surgeons to safely and confidently perform deep lateral orbital wall decompression. J Korean Ophthalmol Soc 2011;52(8):964-969
소아 백색증 환자의 임상양상과 이에 따른 저시력 기구의 임상효과
오두환,박신혜,이정규,문남주,Doo Hwan Oh,Shin Hae Park,Jeong Kyu Lee,Nam Ju Moon 대한안과학회 2011 대한안과학회지 Vol.52 No.4
Purpose: To assess clinical features and efficacy of spectacles and low vision devices in pediatric patients with albinism. Methods: A retrospective study was performed of 15 pediatric patients with albinism for whom glasses and low vision devices had been prescribed to determine subjective satisfaction and objective improvement in visual acuity (VA), strabismus, contrast sensitivity, number of reading letters during 1 minute with refractive correction and low vision devices. Results: The median refractive correction was +0.12 ± 5.45 diopter (D) spherical equivalent with -0.71 ± 3.62 D astigmatism. Most patients complained of reading difficulty and photophobia. Hand-held magnifier and Keplerian telescope were commonly prescribed low vision devices. In addition, VA, strabismic deviation, contrast sensitivity and number of reading letters during 1 minute significantly improved after wearing glasses and low vision devices. Conclusions: The present study showed a significant improvement in corrected VA, alignment and subjective symptoms in pediatric patients with albinism by wearing glasses and low vision devices. Additionally, high compliance can improve final patients’ satisfaction through using training of low vision devices. J Korean Ophthalmol Soc 2011;52(4):466-471
병렬 및 분산 컴퓨팅 : 동영상 스트리밍 서비스의 QoS유지를 위한 듀얼 트랜스코딩 기법
오두환 ( Doo Hwan Oh ),노원우 ( Won Woo Ro ) 한국정보처리학회 2014 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.3 No.7
스트리밍 서비스에 사용되는 트랜스코딩 서버는 동시에 다수의 트랜스코딩 요청을 처리한다. 하지만 트랜스코딩 연산의 부하가 높기 때문에 단일 서버가 수용할 수 있는 요청 개수는 제한적일 수밖에 없다. 본 논문에서는 단일 서버의 트랜스코딩 성능을 높이고자 CPU 기반 트랜스코더와 GPU 기반 트랜스코더를 동시에 사용하는 듀얼 트랜스코딩 방법을 제안한다. 듀얼 트랜스코딩 방법은 트랜스코딩 요청을 처리하기 전에 워크로드를 예측하여 해당 요청에 대한 QoS유지가 가능한지 판단한다. QoS유지가 가능하다고 판단되면 CPU 또는 GPU 트랜스코더 중 보다적합한 타입의 장치에 작업을 할당함으로써 연산 자원의 효율성을 높인다. 성능 평가 결과 듀얼 트랜스코딩 기법은 기존 방식 대비 최대 1.84배의 성능 향상을 이루었다. 결과적으로 단일 서버가 보다 많은 사용자의 요청을 QoS 유지 하에 제공할 수 있게 되었다. Video transcoding techniques provide an efficient mechanism to make a video content adaptive to the capabilities of a variety of clients. However, it is hard to provide an appropriate quality-of-service(QoS) to the clients owing to heavy workload on transcoding operations. In light of this fact, this paper presents the dual transcoding method in order to guarantee QoS in streaming services by maximizing resource usage in a transcoding server equipped with both CPU and GPU computing units. The CPU and GPU computing units have different architectural features. The proposed method speculates workload of incoming transcoding requests and then schedules the requests either to the CPU or GPU accordingly. From performance evaluation, the proposed dual transcoding method achieved a speedup of 1.84 compared with traditional transcoding approach.
ID 기반 암호 기법을 이용한 SCADA 시스템에서 비밀 키관리 및 복구 방안
오두환(Doo-Hwan Oh),최두식(Doo-Sik Choi),나은성(Eun-Sung Na),김상철(Sang-Chul Kim),하재철(Jae-Ceol Ha) 한국정보보호학회 2012 정보보호학회논문지 Vol.22 No.3
SCADA(Supervisory Control and Data Acquisition)시스템은 국가의 중요한 기반 망인 전력, 가스, 상하수도 등을 제어하기 위해 사용된다. 이전의 폐쇄적인 통신 환경과 달리 최근 개방 통신 환경을 사용함에 따라 안전한 통신을 위한 키 관리 기술이 연구되고 있다. 본 논문에서는 SCADA시스템을 구성하는 MTU(Master Terminal Unit), Sub-MTU, RTU(Remote Terminal Unit)에 각각 페어링을 이용한 ID 기반의 키 관리 방안을 제시한다. 또한, 예상치 못한 사고나 악의적인 공격들로 인하여 장치들의 개인 키가 노출되거나 또는 KMS(Key Management System)의 마스터 키가 노출되었을 경우에도 SCADA의 키 관리 시스템을 복구할 수 있는 방법을 제시한다. The SCADA(Supervisory Control and Data Acquisition) systems are used to control some critical national infrastructures such as electricity, gas, and water distribution systems. Recently, there are many researches on key management scheme for secure communication due to change to the open network environment. We propose a new key management method which is established on ID-based cryptosystem using pairing on MTU(Master Terminal Unit), Sub-MTU, and RTU(Remote Terminal Unit). Furthermore, we present a redistribution protocol of private key of each device and a system recovery protocol as a countermeasure of exposure of KMS(Key Management System) master key which is occurred by some unexpected accidents or malicious attacks.