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소아 굴절검사방법에 따른 차이 비교 및 생활양식이 근시에 미치는 영향
최영호,최윤영,Young-Ho Choi,Yun-Young Choi 대한안과학회 2005 대한안과학회지 Vol.46 No.11
Purpose: We examined the several refractive errors and measured the axial length of child patients who visited Fatima Hospital and then assessed the distribution of refractive error and axial length. We also compared the patients` life-styles with refractive error and axial length. Methods: We examined automated refraction, manifest refraction, 1% Cyclogyl refraction, 1% atropine refraction and axial length with an A-scan in patients between 5 and 15 years old. We asked their parents to provide information about the life-style of the patients using a questionnaire. Results: The difference between manifest refraction and 1% Cyclogyl refraction was significant in patients under 9 years of age, but not significant in patients over 10 years of age. We found that the greater degree of myopia the patient had, the longer the total length and vitreous length. Patients who played outdoors for less than 2 hours per day, read more than 2 books per week and had 1 or more parent with myopia, had greater degrees of myopia. Conclusions: We found that 1% Cyclogyl refraction with manifest refraction is necessary for refraction examination in children, and the degree of myopia is closely related with an indoor life-style, the amount of reading books and the parents myopia.
슬관절 테이핑이 정상인의 근 피로와 고유수용성 감각에 미치는 효과
최영호,정호발,유병규,김경미,Choi Young Ho,Joung Ho Bal,Yu Byong-Kyu,Kim Kyeong-Mi 대한물리치료학회 2002 대한물리치료학회지 Vol.14 No.4
This study purposes at applying knee joint taping to preventing muscle fatigue. Twenty six subjects between the ages of 20s and 30s were randomly sampled among healthy males, with an average age of 26yr(range, 22 to 31yr). None of the subjects had a recent or remote history of significant lower extremity injury, No subjects had a history of central nervous system equilibrium problems. To develop muscle fatigue, Isokinetic exercise, which is a repetition of flexion and extension knee joint to $180^{\circ}$/sec, was performed 50 times per person. During the exercise, change of proprioception were measured by applying taping on both knee joints. Analysis has carried out by means of one-way ANOVA with repeated measures and independent t-test at the significance level of $\alpha$=0.05 to detect statistic significance. The results of this study were as follows: First, it was found that the generation of lower extremity muscle fatigue significant affects on proprioception (p < 0.05). Second, the application of taping to knee joint after the generation of lower extremity muscle fatigue significant affect proprioception (p < 0.05). Third, while continual exercise after the generation of muscle fatigue, taping group was significant differences in proprioceptive loss than non-taping group(p < 0.05).
특발성 황반원공에서 내경계막 제거함에 있어 인도사이아닌그린 염색 사용여부에 따른 수술 결과
최영호,박준우,조영욱,Young-Ho Choi,Joon-Woo Park,Young-Wook Cho 대한안과학회 2005 대한안과학회지 Vol.46 No.8
Purpose: In this study, the outcome of internal limiting membrane (ILM) peeling in idiopathic macular hole surgery with or without indocyanine green (ICG) was investigated. Methods: Thirty eyes of 28 patients with idiopathic macular hole stage 3 or 4 who underwent vitrectomy were included. Follow-up duration in all cases was longer than 6 months. We analyzed the anatomical and functional results of macular hole surgeries using ILM peeling with (15 eyes) and without ICG (15 eyes). Results: There were no significant differences in sex, age, symptom duration, hole size, preoperative corrected visual acuity, or follow-up duration between the two groups. Anatomical success rates were 93.3% (14/15 eyes) in ILM peeling with ICG and 80.0% (12/15 eyes) in ILM peeling without ICG. In the cases of anatomical success, there was a statistically- significant difference between the functional success rates of 50.0% (7/14 eyes) in ILM peeling with ICG and 91.7% (11/12 eyes) in ILM peeling without ICG. Conclusions: While there was no statistically-significant difference in the anatomic success rate for idiopathic macular hole surgery with and without ICG, our results suggest the ILM peeling using ICG might produce a negative effect on functional success. Further studies are necessary to evaluation the toxicity of ICG in the context of macular hole surgery.
등거리 스테레오 전방위 렌즈의 위치 측정 알고리듬을 위한 파라미터 측정에 관한 연구
최영호 ( Young-ho Choi ),강민구 ( Min-goo Kang ),조문신 ( Moon-shin Zo ) 한국인터넷정보학회 2007 인터넷정보학회논문지 Vol.8 No.5
전방위 렌즈(Catadioptric mirror)는 전방위 감시를 위해 널리 사용되고 있다. 대부분의 전방위 렌즈에서의 단점은 전방위 렌즈를 통하여 획득한 영상의 해상도가 위치에 따라 일정하지 않다는데 있다. 본 논문에서 사용한 등거리 전방위 렌즈는 이러한 문제를 해결할 수 있도록 설계된 렌즈이다. 실제 등거리 전방위 렌즈를 통한 거리 계산 시 오류의 원인으로는 카메라 영상 센서와 전방위 렌즈와의 축의 어긋남, 설계 시 가정한 focal length의 변화 등을 들 수 있는데 이 중 focal length의 변화는 기구의 정확한 제작으로 해결할 수 없는 문제이다. 본 논문에서는 이러한 focal length의 변화에 대처하기 위하여 focal length를 수정하는 방법을 제안한다. 영상 정합을 통해 임의로 선정된 두 개의 objects points에 대한 반대편 스테레오 영상에서 대응점을 찾은 후 이들 화소의 원점에서의 거리를 사용하여 경계에 해당하는 화소의 위치를 찾는다. 이렇게 측정된 경계의 위치가 미리 계산된 경계화소의 위치와 다를 경우 제안한 방법으로 focal length의 값을 수정한다. 제안한 방법은 매우 간단한 계산만으로 기존의 반복적 연산을 통해 수행한 focal length 수정 방법과 유사한 성능을 보인다. Catadioptric mirrors are widely used in automatic surveillance system. The major drawback of catadioptric mirror is its unequal image resolution. Equidistance catadioptric mirrir can be the solution to this problem. The exact axial alignment and the exact mount of mirror are the sources that can be avoided but the focal length variation is inevitable. In this paper, the effects of focal length variation on the computation of depth and height of object` point are explained and the effective and simple focal length finding algorithm is presented. First two object`s points are selected, and the counterparts on the other stereo image are to be found using MSE criterion. Using four pixel distance from the image center, the assumed focal length is calculated. If the obtained focal length is different from the exact focal length, 24mm, the focal length value is modified by the proposed method. The method is very simple and gives the comparable results with the earlier sophisticated method.
학술논문 : 군산거주 일본인의 귀환과정에 나타난 지역적 특성 -세화회의 조직과 활동을 중심으로-
최영호 ( Young Ho Choi ) 한일민족문제학회 2014 한일민족문제연구 Vol.26 No.-
This paper analysed the characteristics in population of Japanese people lived in Gunsan and Okgu area, and drawed the localities in formation and activities of Gunsan Sewakai as autonomous organization in relation to repatriation of colonials through the investigation on the resources written by residents there. The most important task of this paper is to find out local features of Gunsan comparing to Seoul and Busan which I had already researched. I tried to find out the localities in the memoirs of repatriates concerned as far as possible. And I tried to realize partly my critical point that we need to have multilateral sight towards repatriations of Japanese people in Korea under the definition of localities. We can confirm that Japanese community in Gunsan, in spite of distorted colonial society, had higher fixedness than other areas. Thus the fixedness made Gunsan`s colonials want to remain there even after the liberation of Korea. Duration around 6 months of Gunsan`s Sewakai was shorter than Seoul or Busan, but it sustained comparatively stable executive members. And it started its first mission procuring the ships for voluntary repatriates from Gunsan Port as notable activity. It also had to fulfill the instructions for unconditional banishment under the occupation of U.S. armed forces, but the activities can`t be seen so much in the related documents.