한국인에서 광간섭단층촬영술 수치의 나이에 따른 차이

하성우,노세현,Sung-Woo Ha,Sae-Heun Rho 대한안과학회 2005 대한안과학회지 Vol.46 No.12

지오그리드 유무에 따른 조립토의 전단거동 특성

하성우(Sung-Woo Ha),김대현(Daehyeon Kim),박경호(Kyeong-Ho Park),정신규(Sin-Kyu Jung),전상주(Sang-Joo Jeon) 한국지반신소재학회 2012 한국지반신소재학회 학술발표회 Vol.2012 No.11

In this study, large direct shear tests on two types of coarse grained soils were performed to understand the effects of particle size on the shear behavior of coarse grained soils with/without geogrid reinforcements. In the case of coarse grained soil without geogrid, the maximum shear stress increased with an increase in normal stress for medium and large particle size.

스마트 빌딩을 위한 M2M/IOT 기반 하수도 맨홀 모니터링 시스템 설계 및 구현

하성우 ( Sung-woo Ha ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.2

스마트빌딩에서는 시설물에 대한 효과적인 관리체계 및 안전관리체계를 구축하는 것이 매우 중 요하다. 지하 매설관의 경우에는 유속, 유량계 등의 센서를 설치하여 관로 흐름을 상시 감시하며, 노후되거나 슬러지가 축적된 관로는 문제가 발생하기 전에 교체 공사를 지시 할 수 있어야 한다. 본 논문에서는 하수(오수,우수)도 맨홀 내 정보를 감지하여 실시간으로 전달, 판단, 처리 및 제어 할 수 있는 M2M/IOT 기반의 하수(오수,우수)도 맨홀 내 모니터링 시스템을 설계 구현한다.

결막 뮬러근 절제술의 임상 결과와 수술 성공에 미치는 요인

박대일,하성우,유혜린,Dae Il Park,Sung Woo Ha,Helen Lew 대한안과학회 2011 대한안과학회지 Vol.52 No.11

Purpose: To investigate clinical outcomes and to analyze the factors of successful treatment of conjunctiva-Müller muscle resection (CMMR) in patients with mild to moderate ptosis. Methods: The medical records of 22 patients (30 eyes) with upper lid ptosis were retrospectively reviewed. All patients underwent conjunctiva-Müller muscle resections, and four patients (seven eyes) underwent concurrent upper lid blepharoplasty. The mean follow-up period was 81.62 ± 21 days. Pre- and post-operative MRD1, IPF and pupil to brow distance were measured using the Image J program. A preoperative phenylephrine test and a pathologic examination were performed to analyze the presence of Müller’s muscle and the tear secreting glands from the CMMR specimens. Results: The overall success rate of the procedure was 93%. Postoperatively, the MRD1 increased on average by 1.47 mm (p = 0.00) and increased by an average of 1.72 mm when the phenylephrine test response was greater than 2 mm and by 0.99 mm when the response less than 2 mm. The Müller muscle was observed in every specimen. Conclusions: Conjunctiva-Müller muscle resection is an effective and safe method for treating mild to moderate ptosis, for which the preoperative phenylephrine test result is the most important factor for surgical success. J Korean Ophthalmol Soc 2011;52(11):1263-1268

안경 착용 후 호전된 간헐성 외사시 환자들의 임상적 특징

이재연,하성우,유혜린,Jae Yeun Lee,Sung Woo Ha,Helen Lew 대한안과학회 2012 대한안과학회지 Vol.53 No.6

Purpose: To evaluate clinical features of patients who have experienced decreased exodeviation after refractive error correction. Methods: Thirty-four patients who experienced decreased exodeviation after refractive error correction between 2003 and 2010 were evaluated. Visual acuity, refractive errors, reported age at onset, duration of wearing glasses, stereopsis, and function of fusion were evaluated. Results: The present study included 34 patients with intermittent exotropia. Before correcting refractive errors, the mean visual acuity was 0.34 ± 0.27 for the right eye and 0.37 ± 0.27 for the left eye according to log MAR. After refractive error correction, mean visual acuity improved to 0.12 ± 0.11 for the right eye and 0.11 ± 0.11 for the left eye according to log MAR. Before correcting refractive errors, the amount of deviation was 18.1 ± 7.4 PD at near and 13.5 ± 8.4 PD at far. However, after correcting refractive errors, the amount of deviation decreased to 5.8 ± 8.6 PD at near and 4.5 ± 7.6 PD at far (p < 0.05). Conclusions: The clinical characteristics of children who have decreased exodeviation after correcting refractive errors is shown by a greater amount of deviation at near than at distance and good fusional vergence and stereoacuity. Because correcting refractive errors by wearing appropriate glasses can decrease exodeviation, the authors of the present study recommend correcting refractive errors as the initial management for exotropia. J Korean Ophthalmol Soc 2012;53(6):819-824

위눈꺼풀이완증 환자에서 피부와 결막의 조직학적 소견

박종서,하성우,유혜린,Jong-seo Park,Sung-Woo Ha,Helen Lew 대한안과학회 2011 대한안과학회지 Vol.52 No.5

Purpose: To evaluate histopathologic properties of eyelid skin and conjunctiva and the association between clinical manifestation and histopathologic findings. Methods: A prospective study was conducted on the histologic findings of the upper eyelid skin and conjunctiva performed from November 2009 to February 2010 in 27 patients for upper eyelid blepharoplasty procedures. Histopathologic studies were performed for specimens collected from the upper eyelid skin and inferotemporal bulbar conjunctiva. Preoperative photographs of the upper eyelid and conjunctiva were taken to grade clinical severity of dermatochalasis and conjunctivochalasis. Results: Decrease of collagen density and elastic degeneration in the eyelid skin and conjunctiva were significantly associated with aging (p < 0.001, p = 0.001, p = 0.001, p < 0.001). Clinical severity of dermatochalasis was correlated with a decrease of collagen density and elastic degeneration in the eyelid skin, and clinical severity of conjunctivochalasis was associated with a decrease of collagen density, elastic degeneration and lymphangiectasia in conjunctiva (p < 0.001). Conclusions: Change of collagen fiber and elastic fiber in the eyelid skin and conjunctiva was observed with aging. Relaxation of the eyelid skin and conjunctiva was correlated with histologic findings. J Korean Ophthalmol Soc 2011;52(5):582-588

성인 코눈물관협착 환자에서 실리콘관 삽입술의 장기적인 결과에 영향을 미치는 요인

박종서,하성우,유혜린,Jong-seo Park,MD,Sung-Woo Ha,MD,Helen Lew,MD 대한안과학회 2011 대한안과학회지 Vol.52 No.2

Purpose: To evaluate factors affecting the outcome of silicone tube intubation in patients with nasolacrimal duct obstruction. Methods: A retrospective study of the outcome of silicone tube intubation performed from August 2001 to August 2009 in 98 patients (132 eyes) with nasolacrimal duct obstruction was conducted. Improvement was defined as the disappearance of epiphora after silicone tube intubation and success was defined as maintenance of improvement by the time of the final patient follow-up. Recurrence was also defined as appearance of epiphora after silicone tube extubation. Results: The success rate was 76.5% (101 eyes), failure rate was 8.3% (11 eyes), and recurrence rate was 15.2% (20 eyes). Preoperative canaliculus irrigation test was significantly correlated with symptomatic improvement and recurrence after silicone tube intubation (p = 0.003 and 0.045, respectively). The mean time that patients experienced recurrence was 43.7 months after silicone tube intubation, according to Kaplan-Meier survival analysis. Conclusions: Preoperative canaliculus irrigation test is a simple and effective tool to estimate the outcome of silicone tube intubation. This outcome should be considered in the stage of planning treatment in nasolacrimal duct obstruction patients. J Korean Ophthalmol Soc 2011;52(2):129-135

S-1 전신 항암 요법 후 발생한 눈물길 폐쇄 2예

박종서,하성우,유혜린,Jong-Seo Park,Sung Woo Ha,Helen Lew 대한안과학회 2010 대한안과학회지 Vol.51 No.6

Purpose: To report two cases of lacrimal drainage obstruction associated with the anticancer drug S-1 (tegafur, gimeracil, oteracil ; TS-1Ⓡ, Taiho Pharmaceutical, Japan). Case summary: (Case 1) A 34-year-old male who had previously undergone a total gastrectomy for treatment of gastric cancer visited with epiphora in both eyes that had developed 6 months after S-1 treatment. On examination, a right canalicular obstruction and left punctal and nasolacrimal partial obstruction were noted. Endoscopic dacrycystorhinostomy with lacrimal trephinization was done in the right eye and punctoplasty with punctal membrane removal and silicone tube intubation were performed in the left eye and the epiphora were successfully treated. (Case 2) A 60-year-old male who was treated with S-1 for gastric cancer presented with tearing in both eyes that had developed 2 months after S-1 treatment. Ophthalmic examinations revealed a right nasolacrimal partial obstruction in the right eye and lacrimal sac obstruction in the left. Silicone intubations were performed on both sides and the epiphora were successfully treated. Conclusions: Lacrimal drainage obstructions may develop after S-1 treatment. Therefore, ophthalmologic evaluations should be performed in patients treated with S-1 to detect lacrimal drainage obstruction. J Korean Ophthalmol Soc 2010;51(6):890-894

미숙아의 안축장에 영향을 미치는 요인에 대한 분석

박대일,하성우,박성배,윤영수,Dae Il Park,MD,Sung Woo Ha,MD,Seong Bae Park,MD,Young Soo Yun,MD 대한안과학회 2010 대한안과학회지 Vol.51 No.1

Purpose: To analyze the effect of presence with or absent of retinopathy of prematurity (ROP) and its stage, birth weight, conceptual age and associated diseases on the axial length of premature infants’ eye. Methods: A total of 102 eyes of 51 premature infants less than 36 weeks of conceptual age were evaluated in this study. Fundus examination for ROP and axial length measurement were conducted at 40, 52 and 64 weeks of postconceptual age. The medical records were reviewed retrospectively. Independent t-test analysis, simple regression analysis, and one-way ANOVA were performed to assess the influence of each factor on axial length. Results: The mean axial length at 40, 52 and 64 weeks were 17.35, 18.80 and 19.78 mm, respectively. The mean axial length with and without ROP at 40 weeks were 17.10 mm and 17.54 mm, respectively, which were statistically significant (p=0.000). There was a significant decrease in axial length at 40 weeks in the higher ROP stage (p<0.05). Axial length and birth weight showed positive correlation with statistical significance at 40 weeks, while these parameters showed no significant correlation at 64 weeks. Axial length and conceptual age showed a positive correlation with statistical significance at 40 weeks (p=0.000), yet a negative correlation at 64 weeks with no statistical significance (p=0.306). A significant difference was not observed between sex and the associated diseases. Conclusions: The factors that affect the axial length of an infants’eye at 40 weeks were ROP and its stage, birth weight, and conceptual age. Additionally, there was no significant relationship between sex and the associated diseases. J Korean Ophthalmol Soc 2010;51(1):81-87

스마트 무드등 블라인드 개발

송준호(Jun-Ho Song),안성우(Sung-Woo An),이진형(Jin-Hyung Lee),최환희(Hwan-Hee Choi),하태형(Tae-Hyung Ha),강태구(Tae-Koo Kang) 대한전기학회 2019 대한전기학회 워크샵 Vol.2019 No.7