http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Laser를 이용한 새로운 미세혈관 문합술의 실험적 연구
조진환,임재호,박승하,김우경,Cho, Jin-Hwan,Lim, Jae-Ho,Park, Seung-Ha,Kim, Woo-Kyung 대한미세수술학회 1993 Archives of reconstructive microsurgery Vol.2 No.1
A comparative study was undertaken to evaluate the contact Neo-dymium : yttrium aluminum garnet(Nd:YAG) laser system for vascular anastomosis of small caliber blood vessels(diameter 0.5-1.2 mm) in the animal model. In this study 40 femoral arteries and 40 femoral veins of Sprague-Dawley rats were anastomosed by contact laser assisted microvascular anastomosis(LAMA) utilizing 3 stay sutures which were placed 120 degrees apart and the intervals welded with contact Nd:YAG laser unit, conventionally sutured anastomosis(CSA) served as controls. The time needed for vascular anastomosis, patency rate(immediate postoperative, postoperative 2nd day, postoperative 1 week, postoperative 4 weeks), gross and microscopic evaluations were compared to conventional microsurgical suture technique. The results are as follows: 1. Postoperative patency rate was 82.5% for femoral artery and 75% for femoral vein by contact LAMA technique compared to 90% and 75% by CSA technique at postoperative 4 weeks. 2. Less time-consumed for arterial anastomosis by 6 minutes 23 seconds and venous anastomosis by 8 minutes 55 seconds with contact LAMA technique compared to CSA technique. 3. Grossly almost complete healing had taken place by postoperative 1 week by contact LAMA technique. 4. Aneurysm formation was 5% for femoral artery and 15% for femoral vein by contact LAMA technique compared to 5% and 10% respectively by CSA technique. 5. Microscopically, re-endothelization was complete by postoperative 7th day by contact LAMA technique. There was less medial hypertrophy and hyperplasia and also less inflammatory response compared to CSA.
조진환(Jin-Hwan Cho),장시웅(Si-Woong Jang) 한국정보통신학회 2021 한국정보통신학회 종합학술대회 논문집 Vol.25 No.2
최근 딥러닝 환경의 확산으로 인하여 데이터셋 생성의 중요성이 높아지고 있어, 효율적인 데이터셋 생성을 위하여 GAN을 활용하여 데이터를 증강시키고 있다. 그러나 GAN을 활용하여 생성되는 데이터에는 학습 초기 발생하는 문제점 및 생성되는 영상 내에 픽셀 깨짐 현상이 발생하는 등 여러 문제점이 발견되고 있다. 본 논문에서는 기존 GAN에서 발생하는 여러 문제점을 해결하기 위하여 파손 영상 데이터 선별 알고리즘을 구현하고자 한다. 파손 영상 선별 알고리즘은 영상 내의 히스토그램 분포를 분석하고 해당 결과값이 지정한 임곗값에 만족하는지에 따라 생성된 영상의 저장 여부를 결정하도록 구현하였다. Recently, the spread of deep learning environments has increased the importance of dataset generation. Therefore, data is being augmented using GAN for efficient data set generation. However, several problems have been found in data generated using GAN, such as problems that occur in the early stages of learning and pixel breakage occurring in the generated image. In this paper, we intend to implement an image data selection algorithm to solve various problems arising from the existing GAN. The broken image screening algorithm was implemented to analyze the histogram distribution in the image and determine whether to store the generated image according to whether the result value satisfies the specified threshold value.
曺晋煥(Jin Hwan Cho) 대한정형외과학회 1968 대한정형외과학회지 Vol.3 No.4
75 cases of fractures in the dorsal and lumbar spine treated at the Orthopedic Department of the 17th Army Hospital in the year of 1966 to 1967 was analyzed and discussed. 1) Falling was the most common type of the fracture in this series and it was 50 cases out of 75. 2) Incidence of the fracture was higher in L-l vertebra including 32 out of 115 vertebrae and 74 out of 115 vertebrae were included in dorsolumbar junction. 3) Compression fracture was most common in this series as 99 out of 115 vertebral fractures, among them mild compression fracture was 67 cases. 4) 58 cases out of 75 were stable fractures and 17 cases were unstable fractures. 5) Calcaneal fracture were associated with in six cases of spine fractures caused by falling and Colle’s fracture. fracture of the malleoli. pelvis and neck of the femur were associated with in two cases respectively. Paraplegia in six cases, ileus in five cases. cerebral hemorrhage in two cases. occured as early complication. Infection in urinary tract in three cases. kindney stone in two cases. occurred as late complication. 6) Of the 58 cases of stable fractures 55 were treated by simple bed rest followed by active exercise of the back muscles in average of two weeks and three cases were teated. by manual reduction followed by hyperextension cast immobilization for three to four months. Of the 17 cases of unstable fractures included nine case of fracture dislocations. nine cases were treated by posterior spinal fusion. four were treated by laminectomy and two were treated by laminectomy and simultaneous spinal fusion. 7) Stable fractures treated by bed rest had better results than those treated by reduction and hyperextension cast. In unstable fracture and fracture dislocation in all of nine cases treated by early spinal fusion was asymptomatic, but four of five cases treated by hyperextension cast had lumbago.
생산 라인에서의 제품 생산량 카운트를 위한 시스템 설계
조진환(Jin-Hwan Cho),장시웅(Si-Woong Jang) 한국정보통신학회 2020 한국정보통신학회 종합학술대회 논문집 Vol.24 No.1
기존에는 공장의 제품 생산 라인에서 제품이 생산되는 것을 카운트하기 위해서 사람을 쓰는 경우가 많다. 이러한 시스템은 사람이 눈으로 직접 확인을 하고 카운트를 진행하기 때문에 실수로 인해 정확도가 떨어질 수 있고, 사람을 고용하기 때문에 인건비도 증가한다는 단점이 있다. 이보다 조금 더 고도화된 시스템으로 PLC 접점의 기능을 이용하여 PLC 설비 위에서 일정 이상의 힘을 가해 제품 생산을 카운트하는 시스템도 있지만, 일정 이상의 힘을 가하지 못할 정도로 가벼운 제품의 경우 정확한 카운트가 어렵다는 단점이 있다. 본 논문에서는 거리 감지 센서를 라인의 양쪽에 배치하여 서로의 거리를 탐지하고 있고 각 센서까지의 거리보다 작을 경우, 제품이 생산되었다고 판단하여 신호를 주게 되고, 해당 신호 발생 시 라인 상단에 배치되어 있는 카메라에서 지정된 제품의 데이터 셋에 따른 영상 처리를 통해 제품을 인식하여 제품의 생산량을 카운트하고 더 나아가 불량품 검사까지 진행하여 생산량 카운트에 따른 인건비 절감 및 정확도 향상을 목표로 하는 제품 생산량 카운트 시스템을 설계한다.