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최영원(YW CHOI),김문욱(MW Kim) 대한산부인과학회 1984 Obstetrics & Gynecology Science Vol.27 No.3
Balantidium coli is the only ciliated protozoon infecting man. The great majority of infections are noninvasive, asymptomatic, and self-limited. However the infection causes balantidial dysentery occassionally and rarely may lead to extraintestinal balantidiasis. We report a 58-year-old woman with vulvovaginal balantidiasis developing hyperemia on the vgina and multiple erosions on the posterior part of vestibule. To the best of our knowledge, it is the first report of this disease in Korea. And we suppose that Balantidium coli is a new another protozoon causing vulvovaginitis.
CNN 모델 평가를 위한 이미지 데이터 증강 도구 개발
최영원(Youngwon Choi),이영우(Youngwoo Lee),채흥석(Heung-Seok Chae) 한국정보과학회 소프트웨어공학 소사이어티 2020 소프트웨어공학회지 Vol.29 No.1
CNN 모델이 이미지 분류와 객체 탐지 등 여러 분야에 활용됨에 따라, 자율주행자동차와 같이 안전필수시스템에 사용되는 CNN 모델의 성능은 신뢰할 수 있어야 한다. 이에 CNN 모델이 다양한 환경에서도 성능을 유지하는지 평가하기 위해 배경을 변경한 이미지를 생성하는 이미지 데이터 증강 도구를 개발한다. 이미지 데이터 증강 도구에 객체가 존재하는 이미지를 입력하면, 해당 이미지로부터 객체 이미지를 추출한 후 수집한 배경 이미지 내에 객체 이미지를 합성하여 새로운 이미지를 생성한다. CNN 모델 성능 평가 방법으로 개발한 도구를 사용하여 기존 테스트 이미지로부터 새로운 테스트 이미지를 생성하고, 생성한 새로운 테스트 이미지로 CNN 모델을 평가한다. 사례 연구로 Pascal VOC2007 테스트 데이터로부터 새로운 테스트 이미지를 생성하고, 새로운 테스트 이미지로 YOLOv3 모델을 평가하였다. 그 결과 기존 테스트 이미지의 mAP보다 새로운 테스트 이미지의 mAP가 약 0.11 더 낮아지는 것을 확인하였다. As CNN model is applied to various domains such as image classification and object detection, the performance of CNN model which is used to safety critical system like autonomous vehicles should be reliable. To evaluate that CNN model can sustain the performance in various environments, we developed an image data augmentation apparatus which generates images that is changed background. If an image which contains object is entered into the apparatus, it extracts an object image from the entered image and generate s composed images by synthesizing the object image with collected background images. As a method to evaluate a CNN model, the apparatus generate s new test images from original test images, and we evaluate the CNN model by the new test image. As a case study, we genera ted new test images from Pascal VOC2007 and evaluated a YOLOv3 model with the new images. As a result, it was detected that mAP of new test images is almost 0.11 lower than mAP of the original test images.
원전 격납건물 내 공극 검출을 위한 비파괴평가 기법 연구
최영원(Yeong-Won Choi),염윤택(Yun-Taek Yeom),김학준(Hak-Joon Kim),송성진(Sung-Jin Song),류승우(Sung-Woo Ryu),김훈희(Hun-Hee Kim),박재석(Jae-Suk Park),권성덕(Sung-Duk Kwon) 한국비파괴검사학회 2020 한국비파괴검사학회지 Vol.40 No.6
원전 격납건물(Containment liner plate; CLP)은 원통형 벽체와 상부 덮개인 돔으로 구성된 구조물로서 사고에 의한 방사성 물질의 누설을 막기 위해 콘크리트 및 라이너 플레이트로 구성되어 있다. 원전 격납건물에서 발생하는 결함은 주로 라이너 플레이트의 부식 및 콘크리트의 공극이며, 그중 콘크리트 내 공극 검사에 대한 연구는 미흡한 실정이다. 본 논문에서는 원전 격납건물의 콘크리트 공극을 검출하기 위해 원전 격납건물 모사 시험편을 제작하였고, 위상배열 초음파기법(Phased array Ultrasonic Testing; PAUT) 및 충격반향기법(Impact echo)을 이용하여 원전 격납건물의 콘크리트 공극 검사 연구를 진행하였다. 위상배열 초음파기법에서는 신호의 세기를 비교 · 분석하였고, 충격반향기법에서는 비접촉식 센서를 이용하여 데이터를 수집하였으며 주파수 스펙트럼의 비교 · 분석을 통해 원전 격납건물의 콘크리트 공극 검출을 위한 비파괴평가 기법 연구를 시도하였다. The containment liner plate (CLP) is a structure consisting of a cylindrical wall and dome acting as an upper cover and which is composed of concrete and liner plate to prevent leakage of radioactive materials resulting from accidents. Defects in CLP are primarily corrosion of liner plate and void in concrete and among them, a study of inspecting void in concrete is insufficient. In this study, a CLP specimen was fabricated to inspect the concrete voids of a CLP, and a void inspection study was conducted using phased array ultrasonic testing (PAUT) and impact echo. In PAUT, the intensity of the signal was compared and analyzed. With the impact echo method, data were acquired using a non-contact sensor, and a non-destructive evaluation method was used to detect concrete voids in the CLP through comparison and analysis of the frequency spectrum.
수첨 포스파티딜콜린을 이용한 콜라겐 리포좀의 제조 및 특성
최영원 ( Young Won Choi ),장부식 ( Boo Sik Jang ),정노희 ( Noh Hee Jeong ) 한국유화학회 2012 한국응용과학기술학회지 Vol.29 No.2
콜라겐 성분을 최대로 보호하면서 안정하게 체내로 흡수 될 수 있도록 고순도 수첨 포스파티딜콜린과 용매사출방법을 이용하여 콜라겐 리포좀을 제조하였다. 리포좀 막의 안정성을 높이기 위해 포스파티딜콜린에 콜레스테롤을 혼합하여, 에탄올과 프로필렌글리콜 혼합용매에 용해하였으며, 이온의 안정화를 위하여 PBS Buffer를 사용하였다. 다양한 변수에 의해 제조된 콜라겐 리포좀의 특성은 동적광산란광도계(DLS), 주사현미경(SEM), 편광현미경(POM)로 분석하였다. The collagen-liposomes were prepared with hydrogenated phosphatidylcholine and by solvent injection method for maximum protection and stable absorption of collagen into the body. Cholesterol was added to phosphatidylcholine to increase the stability of liposome membrane. The mixture was dissolved in ethanol and propylene glycol and PBS Buffer was used to Stabilize ions. The properties collagen-liposome were analyzed by DLS, SEM and POM.
최영원(YW CHOI) 대한산부인과학회 1985 Obstetrics & Gynecology Science Vol.28 No.6
This study was undertaken for the clinical evaluation and statistical analysis on the 29 women with ectopic pregnancy after tubal sterilization who were admitted and treated at the Department of Obstetrics and Gynecology of the Wonkwang University Hospital from January 1, 1980 to September 30, 1984. The results were as follows: 1. 29 cases (12.9%) of 225 women with ectopic pregnancy had previous tubal sterilization. The importance of tubal sterilization had been increasing as an etiologic factor in ectopic pregnancy. 2. The ectopic pregnancy after tubal sterilization was found to occur most frequency in 25~39 years of age, comprising 89.7%. 3. The mean parity was 2.9. The mean number of artificial abortion was 1.5. The average interval between L.M.P. and onset of symptoms was 7.4 weeks. 4. As to symptomatology, lower abdominal pain was encountered in 93.1%, vaginal bleeding or spotting in 65.3%, bearing down sensation in 58.6% and dizziness and fainting in 44.8% respectively. 5. As to interval between tubal sterilization and ectopic pregnancy, 72.4% within 3 years with the shortest interval being 5 months and the longest 8 years. 6. In themethod of tubal sterilization, laparoscopic electrocoagulation was 69%, laparoscopic ring was 17.2% and minilaparotomy was 13.8%. In the time of tubal sterilization, postabortion was 51.7%, interval was 38% and postpartum was 10.3%. 7. The mean hemoglobin level was 8.9gm%, hematocrit was 26.5% and intraperitoneal blood loss was 1,500cc. The mean amount of transfused blood was 2.8 pints. 8. In the location of the ectopic pregnancy, ampullar and isthmic protion were detected in 58.7%, 34.5% respectively. The tubal pregnancy was terminated by rupture in 75.9%, by abortion in 24.1%. 9. 58.6% of total cases were treated by salpingectomy, 24.2% by adnexectomy and 13.8% by hysterectomy. 10. Of total 29 cases, there was no death.
일측성 폐쇄질과 동측의 무신장을 동반한 완전중복자궁 1예
변지수(JS Pyun),강훈(H Kang),최영원(YW CHOI),진소자(SJ Jin) 대한산부인과학회 1981 Obstetrics & Gynecology Science Vol.24 No.6
A case of uterus didelphys associated with unilateral imperforate vagina is reported with a review of the literature. In all cases investigated, ipsilateral renal agenesis was found on the affected side. A summery of the embryologic development of the female reproductive tract is reviewed.
김종덕(JD Kim),노효섭(HS Ro),최영원(YW CHOI),진소자(SJ Jin) 대한산부인과학회 1981 Obstetrics & Gynecology Science Vol.24 No.1
It was not infrequent that we have found primary malignant tumor developed in fallopian tube. But we have rarely experienced teratoma and benign cystic moreover. We have experienced one of the benign dermoid cyst primarily developed in fallopian tube and we are to report it with literary review.