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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
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
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
TPM에서 명령어 인가에 대한 오프라인 사전 공격과 대응책
오두환(Oh, Doo-Hwan),최두식(Choi, Doo-Sik),김기현(Kim, Ki-Hyun),하재철(Ha, Jae-Cheol) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.4
TPM(Trusted Platform Module)은 신뢰 컴퓨팅 환경을 구성하기 위해 근간이 되는 하드웨어 칩으로서 이 칩 의 주요 기능들을 사용하기 위해서는 명령어에 대한 사전 인가 과정이 필요하다. TPM 명령어 인가 과정은 명령어 사용자가 정당한 비밀 정보(usage secret)를 알고 있는 사용자인지를 TPM에게 인지시키는 과정이다. 명령어 인가에 사용되는 비밀 정보는 패스워드 형식이어서 공격자가 사용자와 TPM간의 전송 메시지를 도청할 수 있다면 오프 라인 사전 공격을 통해 유추될 가능성이 있다. 본 논문에서는 이론적으로 제시된 오프라인 사전 공격(off-line dictionary attack)이 가능한지 실제 TPM 칩을 장착한 PC 환경에서 그 가능성을 검증하고 이 공격을 방어하기 위한 새로운 대응 책을 제안하였다. 제안하는 대응책은 현재 사용 중인 TPM 칩의 명령어 구조를 바꾸지 않은 상태에서 바로 응용할 수 있어 이전의 대응책보다 효과적으로 적용할 수 있다. The TPM is a hardware chip for making a trusted environment on computing system. We previously need a command authorization process to use principal TPM commands. The command authorization is used to verify an user who knows a usage secret to TPM chip. Since the user uses a simple password to compute usage secret, an attacker can retrieve the password by evasdropping messages between user and TPM chip and applying off-line dictionary attack. In this paper, we simulate the off-line dictionary attack in real PC environment adopted a TPM chip and propose a novel countermeasure to defeat this attack. Our proposed method is very efficient due to its simplicity and adaptability without any modification of TPM command structures.