영남문집해제 : 공산집 (公山集)

채성원 영남대학교 민족문화연구소 1988 민족문화연구소 자료총서 Vol.4 No.-

Synthesis of Polyacrylonitrile by emulsion polymerization

채성원,이정민,박수진 한국고분자학회 2008 한국고분자학회 학술대회 연구논문 초록집 Vol.33 No.2

컴퓨터 단층촬영 영상에서 3번 요추부 슬라이스 검출을 위한 최적화 기반 딥러닝 모델

채성원,조재현,박예은,정진형,김성진,최안렬 한국정보전자통신기술학회 2023 한국정보전자통신기술학회논문지 Vol.16 No.5

본 논문에서는 근감소증의 발병 여부와 정도를 확인하기 위해 3번 요추부 (L3) CT 영상을 검출하는 딥러닝 모델을 제안하는 것이다. 또한, CT 데이터 내에 L3 레벨과 L3 레벨이 아닌 부분의 데이터 불균형으로 인한 성능 저하의 문제점을 오버샘플링 비율과 클래스 가중치를 설계변수로 하는 최적화 기법을 제시하고자 한다. 모델 학습 및 검증을 위하여 강릉아산병원에 내원한 전립선암 환자 104명, 방광암 환자 46명의 총 150명의 전신 CT 영상이 활용되었다. 딥러닝 모델은 ResNet50을 활용하였으며, 최적화기법의 설계변수로는 모델 하이퍼파라미터 5종과 데이터 증강비율 및 클래스 가중치로 선정하였다. 제안하는 최적화 기반의 L3 레벨 추출 모델은 대조군 (하이퍼파라미터 5종만을 최적화한 모델)과 비교하여 중간 L3 오차가 약 1.0 슬라이스 감소한 것을 확인할 수 있었다. 본 연구결과를 통하여 정확한 L3 슬라이스 검출이 가능하며, 추가적으로 데이터 증강을 통한 오버 샘플링과 클래스 가중치 조절을 통해 데이터 불균형 문제를 효과적으로 해결할 수 있는 가능성을 제시할 수 있다. In this paper, we propose a deep learning model to detect lumbar 3 (L3) CT images to determine the occurrence and degree of sarcopenia. In addition, we would like to propose an optimization technique that uses oversampling ratio and class weight as design parameters to address the problem of performance degradation due to data imbalance between L3 level and non-L3 level portions of CT data. In order to train and test the model, a total of 150 whole-body CT images of 104 prostate cancer patients and 46 bladder cancer patients who visited Gangneung Asan Medical Center were used. The deep learning model used ResNet50, and the design parameters of the optimization technique were selected as six types of model hyperparameters, data augmentation ratio, and class weight. It was confirmed that the proposed optimization-based L3 level extraction model reduced the median L3 error by about 1.0 slices compared to the control model (a model that optimized only 5 types of hyperparameters). Through the results of this study, accurate L3 slice detection was possible, and additionally, we were able to present the possibility of effectively solving the data imbalance problem through oversampling through data augmentation and class weight adjustment.

급성 자발현훈

채성원 대한평형의학회 2008 Research in Vestibular Science Vol.7 No.2

반고리관 기능의 이학적 검사

채성원 대한평형의학회 2009 Research in Vestibular Science Vol.8 No.2

The semicircular canals sense angular acceleration and are arranged in roughly parallel pairs. The vestibuloocular reflex (VOR) is responsible for maintaining binocular fixation and stabilizing binocular foveal images during head movements. The VORs are divided into two types: angular and linear. Angular reflexes are initiated by activation of the semicircular canals. There are several kinds of test for semicircular canal function such as caloric test, rotation test, and pulse step sine test. Caloric testing remains the most useful laboratory test in determining the responsiveness of a labyrinth. It is one of the few tests that allow one labyrinth to be studied independently of the other. The stimulus can be applied relatively easily with techniques that are commonly available. Caloric testing relies on stimulating or cooling the vestibular system by alternately heating and cooling the external auditory canal with water or air. Rotational tests analyze the responses of both labyrinths together. They require a high-torque motor-driven chair and relatively advanced software to analyze the results. Rotatory chair testing is useful in assessing vestibular function in patients with suspected bilateral vestibular hypofunction and children. Step changes in head velocity can be used instead of sinusoidal rotations to identify vestibular hypofunction. Time constant are determined by the time after onset of the stimulus at which slow phase eye velocity has decreased by 67% of its initial value. The use of a novel “pulse-step-sine” (PSS) rotational stimulus can identify abnormal function of the horizontal semicircular canals in human subjects with unilateral and bilateral vestibular deficits. The semicircular canals sense angular acceleration and are arranged in roughly parallel pairs. The vestibuloocular reflex (VOR) is responsible for maintaining binocular fixation and stabilizing binocular foveal images during head movements. The VORs are divided into two types: angular and linear. Angular reflexes are initiated by activation of the semicircular canals. There are several kinds of test for semicircular canal function such as caloric test, rotation test, and pulse step sine test. Caloric testing remains the most useful laboratory test in determining the responsiveness of a labyrinth. It is one of the few tests that allow one labyrinth to be studied independently of the other. The stimulus can be applied relatively easily with techniques that are commonly available. Caloric testing relies on stimulating or cooling the vestibular system by alternately heating and cooling the external auditory canal with water or air. Rotational tests analyze the responses of both labyrinths together. They require a high-torque motor-driven chair and relatively advanced software to analyze the results. Rotatory chair testing is useful in assessing vestibular function in patients with suspected bilateral vestibular hypofunction and children. Step changes in head velocity can be used instead of sinusoidal rotations to identify vestibular hypofunction. Time constant are determined by the time after onset of the stimulus at which slow phase eye velocity has decreased by 67% of its initial value. The use of a novel “pulse-step-sine” (PSS) rotational stimulus can identify abnormal function of the horizontal semicircular canals in human subjects with unilateral and bilateral vestibular deficits.

급성 자발 현훈

채성원 대한평형의학회 2012 Research in Vestibular Science Vol.11 No.-

Vertigo is an illusion of rotation, which results from an imbalance within the

대한이비인후과학회지와 연구출판윤리

채성원 대한이비인후과학회 2009 대한이비인후과학회지 두경부외과학 Vol.52 No.3

Preparation and Characterization of Electrospun Polyacrylonitrile-Based Copolymer

채성원,박수진,이정민 한국고분자학회 2009 한국고분자학회 학술대회 연구논문 초록집 Vol.2009 No.4

Effects of Comonomer on Emulsion Polymerization of Acrylonitrile

채성원,박수진,이정민 한국고분자학회 2009 한국고분자학회 학술대회 연구논문 초록집 Vol.2009 No.4

타액선 상피성 종양 387례에 대한 연구

채성원,최건,최종상,송재준,정광윤,최종욱,Chae, Sung-Won,Choi, Geon,Choi, Jong-Sang,Song, Jae-Jun,Jung, Kwang-Yoon,Choi, Jong-Ouck 대한기관식도과학회 1998 大韓氣管食道科學會誌 Vol.4 No.2

There have been few large scale surveys of salivary gland tumors, because the salivary gland tumors comprised less than 3 percent of all neoplasms of the head and neck. Also there is a problem that the incidences of specific types of tumors have the variation according to the geographic regions. ]'nother Korean reports about salivary gland tumor, they only treated about 100 cases only. Objectives : The purpose of this study is to identify the frequency and clinical characteristics of salivary gland tumors and to compare with other Korean reports. Materials and Methods : We had performed to analyze 387 cases of salivary gland tumors from 1983 to June 1997, were reviewed in histopathological and clinical aspects. The diagnoses of individual tumors were based on the World Health Organization classification. Tumors were analyzed according to the histologic type site, age and sex. Results : The majority (79.1%) of cases occurred in the major salivary glands and 20.9% in the minor. The parotid gland was the most frequent site with 52.4% and submandibular glands with 26.3%. Benign tumors were 79.3% of the tumors and malignant tmon were 20.7%. The most frequent tumor was pleomorphic adenoma occupied 63.8% of the total and frequency percent of histologic type of 98 malignant tumors showed 35.7% of mucoepidermoid carcinomas, 24.5% of adenoid cystic carcinomas. Overall gender with female predominance with 1 : 1.4 of male to female ratio. The average age of patients was 42.8 years. The most frequent chief complaint was a palpable mass. The duration of the symptom was shorter in the malignant salivary gland tumors (26.7 months) than in the benign salivary gland tumors (38.2 months). Conclusion : Comparing to the previous Korean reports, the present study confirms that the incidence of salivary gland tumor was lower in the parotid gland, and was higher in the submandibular and minor salivary glands.