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풍계현,최원석,남우호,신영주,Chi Shian Feng,Won Seok Choi,Woo Ho Nam,Young Joo Shin 대한안과학회 2013 대한안과학회지 Vol.54 No.5
Purpose: To report a case of retained Descemet’s membrane after penetrating keratoplasty (PKP). Case summary: A 64-year-old man visited our clinic, complaining of visual disturbance and corneal opacity in his right eye 40 years in duration. On the first visit, his best corrected visual acuity was hand movement on the right eye, and he underwent an uneventful PKP. On the postoperative first day, the patient’s visual acuity was 20/200 and slit lamp examination showed a retained Descemet’s membrane and pseudo-chamber behind the corneal graft. The corneal graft was edematous, but no intraocular inflammation was observed. The retained Descemet’s membrane was surgically removed a quarter at a time. Sutures in one quadrant were removed; the retained Descemet’s membrane was lifted with forceps, removed with scissors and knife, and then sutured again. Two months after PKP, the corneal graft remained clear and no intraocular inflammation was observed. An extracapsular cataract extraction (ECCE) was then successfully performed with posterior chamber lens implantation for the senile cataract in his right eye. After the 1-year follow-up, the status of the corneal graft remained clear with a single anterior chamber and best corrected visual acuity improved to 20/100. Conclusions: Careful post-operative slit-lamp examination is considered important for diagnosis of retained Descemet’s membrane after undergoing PKP, and surgical removal can be helpful for maintaining the corneal graft clear.
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Performance Comparison of Korean Dialect Classification Models Based on Acoustic Features
Young Kook Kim(김영국),Myung Ho Kim(김명호) 한국컴퓨터정보학회 2021 韓國컴퓨터情報學會論文誌 Vol.26 No.10
말소리의 음향 특징을 이용하여 화자에 대한 중요한 사회, 언어학적 정보를 얻을 수 있는데 그 중 한 가지 핵심 특징은 방언이다. 화자의 방언 사용은 컴퓨터와의 상호작용을 방해하는 주요 요소이다. 방언은 발화의 음소, 음절, 단어, 문장 및 구와 같이 다양한 수준에서 구분할 수 있지만 이를 하나하나 식별하여 방언을 구분하기는 어렵다. 이에 본 논문에서는 음성 데이터의 특성 중 MFCC만 사용하는 경량화된 한국어 방언 분류 모델을 제안한다. 한국인 대화 음성 데이터를 통해 MFCC 특징을 활용하는 최적의 방법을 연구하고, 8가지 머신 러닝 및 딥러닝 분류 모델에서 경기/서울, 강원, 충청, 전라, 경상 5개의 한국어 방언 분류 성능을 비교한다. MFCC를 정규화하는 방법으로 대부분의 분류 모델에서 성능을 향상시켰으며, MFCC를 정규화하기 전 분류 모델의 최고 성능과 비교하여 정확도는 1.07%, F1-score는 2.04% 향상된 성능을 기록하였다. Using the acoustic features of speech, important social and linguistic information about the speaker can be obtained, and one of the key features is the dialect. A speaker"s use of a dialect is a major barrier to interaction with a computer. Dialects can be distinguished at various levels such as phonemes, syllables, words, phrases, and sentences, but it is difficult to distinguish dialects by identifying them one by one. Therefore, in this paper, we propose a lightweight Korean dialect classification model using only MFCC among the features of speech data. We study the optimal method to utilize MFCC features through Korean conversational voice data, and compare the classification performance of five Korean dialects in Gyeonggi/Seoul, Gangwon, Chungcheong, Jeolla, and Gyeongsang in eight machine learning and deep learning classification models. The performance of most classification models was improved by normalizing the MFCC, and the accuracy was improved by 1.07% and F1-score by 2.04% compared to the best performance of the classification model before normalizing the MFCC.
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다양한 원인에 의한 황반하 출혈에서 유리체강내 가스 주입술 여부에 따른 임상양상의 비교
김동욱,풍계현,배소현,김하경,남우호,Dong Wook Kim,Chi Shian Feng,So Hyun Bae,Ha Kyoung Kim,Woo Ho Nam 대한안과학회 2012 대한안과학회지 Vol.53 No.11
Purpose: To assess the clinical course of submacular hemorrhage (SMH) due to various chorioretinal diseases with or without pneumatic displacement and the factors related with the final visual outcome. Methods: The authors of the present study retrospectively reviewed the charts of 12 eyes (group 1) which underwent pneumatic displacement for SMH and the charts of 14 eyes (group 2) which did not receive pneumatic displacement. Best-corrected visual acuity (BCVA) at baseline was compared with the BCVA at 1, 3, and 6 months and on the final visit. Association between final BCVA and other clinical features was analyzed including age, baseline BCVA, duration of symptoms, and size of SMH. Results: In group 1, log MAR BCVA was 1.22 ± 0.66 at baseline and there was a significant BCVA improvement of 0.77 ± 0.57 at 6 months compared with baseline (p = 0.045). On the final visit, 6 eyes (50%) had gained 2 Snellen lines or more. In group 2, BCVA was significantly improved from 1.29 ± 0.70 at baseline to 1.06 ± 0.84 at 1 month (p = 0.045). Ten eyes (71.4%) had gained 2 Snellen lines or more on the final visit. In group 1, there were no factors correlated with final BCVA (p > 0.05), while the final BCVA was significantly correlated with age and baseline BCVA in group 2. Conclusions: Clinicians may expect conservative treatment to lead to significant improvement of BCVA in patients with SMH due to various chorioretinal diseases who did not undergo any procedures to displace the hemorrhage.
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배석현,강신희,풍계현,박주현,정재훈,이가영 대한안과학회 2016 Korean Journal of Ophthalmology Vol.30 No.5
Purpose: To investigate optic nerve head size and retinal nerve fiber layer (RNFL) thickness according to refractivestatus and axial length. Methods: In a cross-sectional study, 252 eyes of 252 healthy volunteers underwent ocular biometry measurementas well as optic nerve head and RNFL imaging by spectral-domain optical coherence tomography. Correlationand linear regression analyses were performed for all subjects. The magnification effect was adjustedby the modified axial length method. Results: Disc area and spherical equivalent were positively correlated (r = 0.225, r2 = 0.051, p = 0.000). RNFLthickness showed significant correlations with spherical equivalent (r = 0.359, r2 = 0.129, p = 0.000), axiallength (r = -0.262, r2 = 0.069, p = 0.000), disc radius (r = 0.359, r2 = 0.129, p = 0.000), and radius of the scancircle (r = -0.262, r2 = 0.069, p = 0.000). After adjustment for the magnification effect, those relationships werereversed; RNFL thickness showed negative correlation with spherical equivalent and disc radius, and positivecorrelation with axial length and radius of the scan circle. The distance between the disc margin and the scancircle was closely correlated with RNFL thickness (r = -0.359, r2 = 0.129, p = 0.000), which showed a negativecorrelation with axial length (r = -0.262, r2 = 0.069, p = 0.000). Conclusions: Optic disc radius and RNFL thickness decreased in more severely myopic eyes, but they increasedafter adjustment for magnification effect. The error due to the magnification effect and optic nervehead size difference might be factors that should be considered when interpreting optical coherence tomographyresults.
KCI
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