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간헐성외사시안의 시기능 훈련 후 편위량 감소에 대한 연구
이창선,김기홍 대한시과학회 2014 대한시과학회지 Vol.16 No.4
Purpose: This study is to investigate factors of deviation change between pre- and post-vision therapy in intermittent exotropia. Methods: A 31 extropes(males 18, females 13) who were performed with vision therapy among 38 of intermittent extropes(males 22: females 16) participated for this study, and their eye deviations were evaluated using JHC test and prism cover test at 6 months and 12 months after vision therapy. Results: Deviation angles for post-vision therapy was significantly decreased than pre-vision therapy(p<0.05), and less decrease of deviation angle for cover prism test showed than for JHC deviation test. However, deviation angle for both two methods was gradually increased as time passed after vision therapy. Conclusion: The deviation effect to vision therapy for intermittent extropia is different with deviation test method, and this decrease of deviation may be not by structural decrease but neurological decrease. 목 적: 본 연구에서는 간헐성외사시안을 대상으로 시기능 훈련 후 편위량의 변화 원인 및 기간경과로 인한 편위량 변화에 대한 요인을 알아보고자 한다. 방 법: 간헐성외사시안 38명(남: 22, 여: 16) 중 8주간 시기능 훈련을 성실히 수행한 31명(남: 18 여: 13)을 대상으로 하였으며, 훈련 전과 훈련 종료 후 그리고 훈련 후 6개월 및 12개월 경과 따라 Jedo-Hun-Changsun(JHC)편위검사 및 프리즘가림검사를 실시하여 간헐성외사시안의 시기능 훈련 후 편위량 변화를 관찰하였다. 결 과: 시기능 훈련 전과 훈련 후의 편위검사에 따른 편위량 변화에 대해서 유의적 수준으로 편위량 감소를 나타내었고(p<0.01), 두 군간의 편위 감소량 비교관찰에서 프리즘가림검사가 JHC편위검사 보다 낮은 편위감소량을 나타내었다. 그러나, 두군 간의 모든 편위검사방법에서 훈련 후 감소된 편위량이 시간경과에 따라 점진적으로 증가를 나타내었다. 결 론: 간헐성외사시안에 대한 시기능 훈련으로 인한 편위 감소효과는 편위 검사방법에 따라 다를 수 있으며, 시기능 훈련에 의한 구조적 편위 감소가 아닌 신경학적 편위 감소를 나타낼 것이다.
수직편위를 동반한 간헐성외사시 소아에 대한 시기능 훈련 후 임상 사례
이창선,김재도,손정식,김대년,장우영,김기홍,Lee, Chang-Seon,Kim, Jae-Do,Son, Jeong-Sik,Kim, Dae-Nyoun,Jang, Woo-Yeong,Kim, Ki-Hong 한국임상보건과학회 2013 한국임상보건과학회지 Vol.1 No.1
Purpose: The purpose is to study the effects of the vision training, as a non-surgically treated vision therapy, on the objective and the subjective symptoms of the patients with intermittent exotropia combined with vertical deviation. Method: For the boys at the age of eight with intermittent exotropia, who report a long-distance blurred vision, dazzling, and intermittent diplopia more than ten times a day, the vision training had been practiced for seven weeks. The objective and subjective symptoms have been examined after six months from the end of the training. Results: The objective and the subjective symptoms have been improved after the seven weeks training and the improvements lasted after six months from the end of the treatment. Conclusion: Non-surgical treatment for the patients with intermittent exotropia, including intermittent exotropia combined with vertical deviation like this case, should be considered as an auxiliary treatment and on the preferential basis.
이창선,강희모,심송용,Lee, Chang-Sun,Kang, Hee-Mo,Sim, Song-Yong 한국데이터정보과학회 2012 한국데이터정보과학회지 Vol.23 No.1
많은 조사에서 표본 크기는 유의수준 또는 제1종 오류확률만을 고려하여 결정하였으나 최근에는 다양한 분야를 중심으로 제1종 오류확률뿐만 아니라 제2종 오류확률 또는 검정력을 함께 고려하여 표본 크기를 결정하는 경우가 늘어나고 있다. 이런 경향은 표본을 많이 얻을 수 없는 연구에서 더욱 뚜렸하다. 본 연구에서는 모평균과 모비율에 대한 검정에서 제1종 오류뿐만 아닌 제2종 오류를 고려한 경우 필요한 표본 크기를 결정하는 과정을 살펴보고 이를 웹사이트를 통해 공개하였다. 또한 주어진 표본 크기와 유의수준에 의한 검정력 계산도 함께 공개하였다. There are cases when the sample size is determined based not only on the significance level but also on on the power or type II error. In this paper, we implemented the sample size and the power calculation when both the significance level and power for testing means in normal distributions and proportions in binomial distributions. The implementation is available on a web site. Alternately, we also calculate the power for a given effect size, type I error probability and sample size.
대전된 입자의 영상효과에 의한 필터효율 향상에 관한 실험적 연구
이창선,정해영,김상수,Lee, Chang-Sun,Jeong, Hae-Young,Kim, Sang-Soo 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.6
Filter efficiency of electrically charged particle in uncharged fibrous filter was measured. In previous studies, the effect of charged particle on filter efficiency was investigated but there was difficulty in measuring of image effect that is appeared at the charged small particle. We could easily measure the image effect with charging small particles by photoelectric charging. The spark discharge aerosol generator and a differential mobility analyzer (DMA) were used to generate sub-micron monodisperse particles (${\leq}200$ nm). The generated particles were charged in photoelectric charging process using ultraviolet lamp and electric field. The filter efficiency of the charged particles, classified by another DMA, was measured in filter tester using a condensation nucleus counter (CNC) as function of particle diameter, particle charge and airflow velocity. It is shown that the filter efficiency increases with increasing charge number of the particle and is affected by particle size and flow velocity. Single fiber filter efficiency mainly depends on image force parameter and peclet number. The peclet number was not considered at previous other papers. We propose a modi fied experimental correlation as function of image force parameter and peclet number.