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갈릴레이와 세극등 빛간섭단층촬영기로 측정한 전안부계측치의 반복성 및 비교
이원혁,황영훈,김세종,이상목,유정권,김용연,이주화,Won Hyuk Lee,Young Hoon Hwang,Se Jong Kim,Sang Mok Lee,Chungkwon Yoo,Yong Yeon Kim,Joo Hwa Lee 대한안과학회 2011 대한안과학회지 Vol.52 No.1
Purpose: To evaluate the repeatability and comparability of anterior chamber depth (ACD) and central corneal thickness (CCT) measurements obtained by Galilei dual Scheimpflug analyzer (Ziemer, Port, Switzerland) and slit-lamp optical coherence tomography (SL-OCT; Heidelberg Engineering, Dossenheim, Germany). Methods: ACD and CCT were measured by Galilei and SL-OCT in 68 eyes of 68 healthy young subjects. Each measurement was performed 3 times by a single examiner, and the repeatability of 3 consecutive measurements was analyzed. ACD and CCT measurements were compared between the 2 devices. Results: Both Galilei and SL-OCT showed high repeatability (ICCs ≥ 0.994) for ACD and CCT measurements. The mean ACD and CCT measured by Galilei were greater than SL-OCT measurements by 0.11 ± 0.09 mm and 14.01 ± 7.38 μm, respectively. The 95% limit of agreement values for ACD and CCT measurements were 0.36 mm, 27.66 μm, respectively, and were highly correlated (correlation coefficients ≥ 0.89, p < 0.001). Conclusions: Although the repeatability of each device was high, ACD and CCT obtained by Galilei and SL-OCT were significantly different. These differences should be considered when interpreting ACD and CCT measurements obtained by the 2 devices. J Korean Ophthalmol Soc 2011;52(1):53-59
이원혁,강용석,황영훈,성미선,신준우,이주화,Won Hyuk Lee,Yong Suk Kang,Young Hoon Hwang,Mi Sun Sung,Jun Woo Shin,Joo Hwa Lee 대한안과학회 2011 대한안과학회지 Vol.52 No.1
Purpose: To report a case of fibrin pupillary block diagnosed by ultrasonic biomicroscopy (UBM) and treated by argon– neodymium:YAG (Nd:YAG) laser in a patient with uveitis. Case summary: A 56-year-old man visited the hospital for decreasing visual acuity and a sudden onset of pain in the right eye. Best corrected visual acuity was 0.02 in the right eye and 1.0 in the left eye. Intraocular pressure (IOP) was 48 mm Hg in the right eye and 18 mm Hg in the left eye. Slit-lamp examination revealed diffuse corneal stromal edema with Descemet's folds and uniform shallowing of the anterior chamber, with 360 degrees of peripheral iridocorneal touch in the right eye. A fibrin membrane was present across the pupil. UBM showed a fibrin membrane across the pupil, uniform shallowing of the anterior chamber, and peripheral angle closure. The lens was displaced posteriorly. A sequential Nd:YAG laser membranectomy was performed that same day, with immediate deepening of the anterior chamber and normalization of the IOP. Conclusions: UBM can play an invaluable role in the diagnosis of fibrin pupillary block by showing the presence of a fibrin pupillary membrane, accumulation of aqueous in the posterior chamber, and a clear separation between the iris and the lens. Nd:YAG laser membranectomy can be performed effectively in a fibrin pupillary block. J Korean Ophthalmol Soc 2011;52(1):117-121
정상안압녹내장에서 시간에 따른 망막신경섬유층 두께변화와 시야변화의 비교분석
이원혁,성미선,신준우,이주화.Won Hyuk Lee. MD. Mi Sun Sung. MD. Jun Woo Shin. MD. Joo Hwa Lee. MD 대한안과학회 2010 대한안과학회지 Vol.51 No.12
Purpose: To evaluate longitudinal changes in retinal nerve fiber layer thickness (RNFL) and visual field in patients with normal tension glaucoma (NTG). Methods: Thirty eyes of 30 NTG patients and 30 eyes of 30 normal control subjects were enrolled in the present study. RNFL thickness was measured using optical coherence tomography (OCT), and visual field tests were performed using a Humphrey visual field analyzer at baseline and 23.3 ± 15.3 months later. Changes in RNFL thickness at each clock-hour segment and visual field sensitivities were analyzed. The rates of change in RNFL thickness were also calculated. Results: Significant differences in RNFL thickness were observed between NTG patients and normal control subjects at the 5, 6, 7 and 12 o’clock positions at baseline (p < 0.001). At follow-up, the RNFL thickness change was not significant for normal control subjects, although it was significant for NTG patients at the 4, 5, 6, 7, 11 and 12 o'clock positions (p < 0.001). Visual field parameters did not change significantly in the normal control subjects or NTG patients. The reduction rates of RNFL thickness were 0.38 μm/month for the NTG patients and 0.11 μm/month for the normal control group, displaying a 3.5-fold faster reduction rate for NTG patients. Conclusions: The NTG group showed greater reductions in RNFL thickness in the upper and lower sectors over time; however, the visual field parameters did not change significantly. The results suggest that progression of glaucoma can be detected in an earlier stage using OCT than can be detected using a visual field test. J Korean Ophthalmol Soc 2010;51(12):1606-1613
계층적 관리 구조를 갖는 정보 자원 관리 시스템의 설계 및 구현
이원혁,안성진,정진욱,Lee, Won-Hyuk,Ahn, Seong-Jin,Chung, Jin-Wook 한국정보처리학회 2002 정보처리학회논문지 C : 정보통신,정보보안 Vol.9 No.3
본 논문에서는 PC나 라우터, 서버 장비 등 모든 정보자윈 시스템을 통합 관리하기 위한 시스템을 제안한다. 이 시스템은 PC 및 라우터의 회선에 대한 성능 분석 항목을 정의하고 분석하며, 서버 장비에 대한 자산 관리를 수행한다. 관리자는 분석된 데이터를 바탕으로 현재 시스템이나 회선에 대한 상태를 파악하기 위한 자료로 활용할 수 있다. 시스템의 구조는 차후 관리 도메인의 증설이 쉽고, 효율적으로 관리하기 위해 3계층으로 구분하여 관리하고자 한다. In this paper, we propose the integrated management system for computing resource such as personal computers, the interface of router, and server equipment. IRMS defines and analyzes the performance factors for system such as pc and router, also it manages assets for server equipment. Manager can make use of data for understanding conditions whether system is normal or not. We suggest a hierarchical integrated management architecture for resolving problems of scalability and managing efficiency in large domain networks.
최근 5년간 치성감염으로 인한 구강악안면부 근막간극에 발생한 농양환자의 임상 통계학적 검토
이원혁(Won-Hyuk Lee),안경미(Kyung-Mi Ahn),장보영(Bo-Young Jang),안미라(Mi-Ra Ahn),이중엽(Jung-Yub Lee),손동석(Dong-Suk Sohn) 대한구강악안면외과학회 2004 대한구강악안면외과학회지 Vol.30 No.6
One of the most difficult problems to damage in dentistry is an odontogenic infection. These infections may range from low-grade, well-localized infections that require only minimal treatment to a severe, life-threatenig fascial space infection. Although the overwhelming majority of odontogenic infections are easily managed by minor surgical procedures and supportive medical therapy that includes antibiotic administration, the practitioner must constantly bear in mind that these infections may become severe in a very short time. We made an investigation was targeting on 78 male and 47 female patients (125 patients in total) who had been hospitalized because of the fascial space abscess on the oral and maxillofacial area and gained a complete recovery in Daegu Catholic University Hospital, Oral & Maxillofacial Surgery from January 1999 to December 2003. By tracing their charts, we could grasp the characteristics such as age, gender, the time of breakout and specific areas of the attacks, making a conclusive study of the statistical analysis and finally, we could reach conclusions. Now, we report the conclusion from the investigation with the literature. The proportion of males and females was approximately 3 to 2, and in age group, patients under 10 years old marked the highest, 22.4%. The patients between the age of 10 and 40 were only 14.4%, yet those who were between 40 and 80 marked 53.6% in contrast. In the monthly distribution, the order was Dec.(13.6%)-Sep.(12%)-Jan.(10.4%) and in seasonal distribution, it was winter(30.4%)-fall(28%)- summer(24.4%)- spring(19.2%). Considering the medical history, D.M. was the highest which was 30.3%, hypertension marked 24.4%, and the patients with both D.M. and hypertension were 9.0%. The major cause of infection of oral and maxillofacial areas was odontogenic infection, which marked about 96%, and especially the cases related to dental caries occurred most frequently, which was 51.2%. In the number of relaxed fascial space, single fascial space was 81.6%, and in the degree of relaxation of fascial space, the buccal space abscess marked 40.8%, following submandibular space abscess, which was 30.4%.
이원혁(Lee, Won-Hyuk) 신영어영문학회 2012 신영어영문학 Vol.53 No.-
This paper investigates on teaching English grammar in an EFL setting. English grammar instruction has recently gained more attention than it used to. Moreover, much research on grammar instruction focuses on the choice of forms and the importance of timing of focus on form. With this in mind, this paper first stresses the importance of the word order between Korean and English as the difference of the word order may result in interlanguage. This paper then suggests that grammar instruction should pay much more attention to the role of a verb in a sentence. Another concern is the importance of discourse context in grammar teaching. In terms of the timing of grammar instruction, this paper deals with how students’ developmental readiness is related to the timing of instruction. Moreover, this paper suggests that it is important to go beyond the teachability hypothesis by stressing that learners do not benefit only from developmentally appropriate instruction.
이원혁(Won-Hyuk Lee),임성환(sung-Hwan Yim),강광희(Kwang-Hwe Kang),권호상(Ho-Sang Kwon) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The Radar is to find the target with radiating signal and taking reflected signal. Commonly the automotive radar use higher frequency range than another radar. The conventional automotive radar detects the nearby obstacle. Currently being developed automotive radar has bigger size and high power than the existing automotive radar because of detection angle and angular resolution of high performance. Automotive radar needs size reduction to be mounted a car and thermal stability for the stable operation of the electronic component. Find the suitable structure for size reduction and thermal stability through changing structure inner radar and using numerical analysis.