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백승혁,최홍락,김경석,Baek, Seung-Hyeok,Choi, Hong-Rak,Kim, Kyung-Seok 한국인터넷방송통신학회 2021 한국인터넷방송통신학회 논문지 Vol.21 No.5
The urinalysis, which is universally accessible to the general public, has disadvantages of being less objective using sight and purchasing a separate portable urinalysis machine. However, due to the high penetration rate and performance improvement of smartphone created by the development of mobile communication technology, research on urinalysis services using smartphone has been conducted. In this paper, a new urinalysis screening application based on smartphone was developed by supplementing the limitations of the previously studied urinalysis services. The key technology of the application is urinalysis recognition algorithm and urinalysis pad color determination algorithm through image-processing and contour detection. In order to confirm the performance of the developed application, urinalysis strip was photographed and analyzed from various backgrounds and angles. 일반인이 보편적으로 접근할 수 있는 요검사는 사람의 눈으로 판단하여 객관성이 떨어지고 별도의 휴대용 요검사기를 구매해야 하는 단점이 있다. 하지만 이동 통신 기술의 발전으로 탄생한 스마트폰의 높은 보급률과 성능 향상으로 스마트폰을 활용한 요검사 서비스에 관한 연구가 진행되었다. 본 논문에서는 앞서 연구된 요검사 서비스들에 대한 제한 사항을 보완하여 새로운 스마트폰 기반 요검사 스크리닝 애플리케이션을 개발하였다. 애플리케이션의 핵심 기술은 이미지 처리와 윤곽선 검출을 통한 요검사지 인식 알고리즘과 요검사 패드 색상 판별 알고리즘이다. 개발한 애플리케이션의 성능을 확인하기 위하여 다양한 배경과 각도에서 요검사지를 촬영하고 분석하였다.
원위부 직장암의 괄약근 보존 술식: 초저위전방절제술 및 대장항문 수기 문합술의 치료 경험
백승혁,김남규,이강영,손승국,조장환 대한대장항문학회 2004 Annals of Coloproctolgy Vol.20 No.6
Purpose: As the oncologic safety of coloanal anastomosis (CAA) has been proven by many other authors, the incidence of CAA following a ultra-low anterior resection has increased. The purpose of this study is to evaluate the functional outcomes and complications for patients who underwent an ultra-low anterior resection and CAA for distal rectal cancer. Methods: 57 patients underwent CAA following an ultra-low anterior resection between July 1997 and November 2003. 44 patients, who were followed up for more than 6 month after diverting ileostomy repair were evaluated for recurrence pattern, complications, and functional outcomes. Results: The median follow-up period was 32.0±22.8 (8∼83) months. The mean age of the patients was 54.3±10.4 (23∼74) years. The types of anastomosis were straight CAA (n=20) and J pouch CAA (n=37). The mean tumor size was 4.1±1.9 (2∼8) cm, the mean distal resection margin was 1.3±0.9 (0.2∼4) cm. Six months later, the anastomosis distance following diverting ileostomy repair was measured at 3.24±0.6 (2∼4) cm from the anal verge. The complications were multiple fistulas (n=3), fistula with anal stenosis (n=1), local recurrence with anal stenosis (n=1), anal stenosis (n=7). Anal incontinence (Kirwan grade III) was noted in 14 patients, and bowel movements more than 6 times per day were observed in 16 patients. Overall recurrence occurred in 6 patients (13.6%). The 5-years survival rate was 84.4%, and the 5-year disease-free survival was 68.9%. Conclusions: Although CAA in patients with rectal cancer provides excellent long-term survival, a low risk of recurrence, in tolerable function, complications, and poor functional outcomes have been observed with CAA; therefore, the choice of this method should be considered carefully.
계층적 폐색 모델링을 통한 미학습 물체의 아모달 인스턴스 분할
백승혁,이주순,김태원,이규빈 제어로봇시스템학회 2021 제어로봇시스템학회 각 지부별 자료집 Vol.2021 No.12
Instance-aware segmentation of unseen objects is essential for a robotic system in an unstructured environment. Although previous works achieved encouraging results, they were limited to segmenting the only visible regions of unseen objects. For robotic manipulation in a cluttered scene, amodal perception is required to handle the occluded objects behind others. This paper addresses Unseen Object Amodal Instance Segmentation (UOAIS) to detect 1) visible masks, 2) amodal masks, and 3) occlusions on unseen object instances. For this, we propose a Hierarchical Occlusion Modeling (HOM) scheme designed to reason about the occlusion by assigning a hierarchy to the feature fusion and prediction order. We evaluated our method on various benchmarks and achieved state-of-the-art performance. Robot demos for picking up occluded objects, codes, and datasets are available at http://sites.google.com/view/uoais.
백승혁,최홍락,김경석,Baek, Seung-Hyeok,Choi, Hong-Rak,Kim, Kyung-Seok 한국인터넷방송통신학회 2021 한국인터넷방송통신학회 논문지 Vol.21 No.6
요검사는 물리적 성상 검사, 화학적 검사, 현미경 검사 세 가지가 있다. 이 중에서 화학적 요검사는 일반인이 쉽게 접근하는 방법으로 요검사지의 화학반응을 눈으로 표준비색표와 비교하거나 휴대용 요검사기를 별도로 구매하여 검사를 진행한다. 현재는 스마트폰의 보급이 대중화되어 스마트폰을 활용한 요검사 서비스 연구가 높아지고 있다. 요검사 스크리닝 애플리케이션은 스마트폰을 활용한 요검사 서비스 중 하나이다. 그러나 요검사 스크리닝 애플리케이션으로 촬영한 요검사 패드 RGB 값은 조명영향으로 인해 큰 편차가 발생한다. 요검사 패드 RGB 값의 편차는 요검사 판별의 정확도를 떨어뜨린다. 따라서 본 논문에서는 스마트폰 기반 요검사 스크리닝 애플리케이션으로 촬영한 요검사지를 검사 항목별 요검사 패드로 분류한 후 CNN을 통해 요검사 패드 이미지 판별의 정확도를 높인다. 요검사지는 다양한 배경에서 촬영하여 CNN 이미지를 생성하였으며 ResNet-50 CNN 모델을 사용하여 요검사 판별을 분석하였다. There are three types of urinalysis: physical test, chemical test, and microscopic test. Among these, the chemical urinalysis is an easily accessible method of the general public to compare the chemical reaction of urinalysis strip with a standard colorimetric table by sight or purchase the portable urinalysis machine separately. Currently, with the popularization of smartphone, research on the urinalysis service using smartphone is increasing. The urinalysis screening application is one of the urinalysis services using a smartphone. However, the RGB values of the urinalysis pad taken by the urinalysis screening application have large deviations due to the effect of lighting. Deviation of RGB value debases the accuracy of urinalysis discrimination. Therefore, in this paper, the accuracy of urinaylsis pad image discrimination is improved through CNN after classifying urinalysis strips taken by the urinalysis screening application based on smartphone by urinalysis pad items. Urinalysis strip was taken from various backgrounds to generate CNN image, and urinalysis discrimination was analyzed using the ResNet-50 CNN model.
백승혁,이경석,정승용,박영규,김홍수,이동호,오한진,김병천 대한의학회 2009 Journal of Korean medical science Vol.24 No.-
A systematic and effective welfare system for people with digestive system impairments is required. In Korea, an objective and scientific rating guideline does not exist to judge the digestive system impairments. Whether the impairments exist or not and the degree of it need to be examined. Thus, with these considerations we need a scientific rating guideline for digestive system impairments to fit our cultural and social background. In 2007, a research team, for the development of rating impairment guidelines, was organized under the supervision of Korean Academy of Medical Sciences. The rating guidelines for digestive system impairments was classified into upper and lower gastrointestinal tracts impairments and liver impairment. We developed objective rating guidelines for the upper gastrointestinal tract, the impairment generated after surgery for the stomach, duodenum, esophagus, and for the lower gastrointestinal tract, the impairment generated after construction and surgery for colon, rectum, anus, and intestinal stomas. We tried to make the rating impairment guidelines to include science, objectivity, convenience, rationality, and actuality. We especially emphasized objectivity as the most important value. We worked to make it easy and convenient to use for both the subjects who received the impairment ratings and the doctors who will give the ratings.