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디스플레이형 자판기 사용자 분석을 위한 이중 단계 검출 및 분류 망
서지원,김미경,Seo, Ji-Won,Kim, Mi-Kyung 한국정보통신학회 2022 한국정보통신학회논문지 Vol.26 No.5
Machine learning techniques using visual data have high usability in fields of industry and service such as scene recognition, fault detection, security and user analysis. Among these, user analysis through the videos from CCTV is one of the practical way of using vision data. Also, many studies about lightweight artificial neural network have been published to increase high usability for mobile and embedded environment so far. In this study, we propose the network combining the object detection and classification for mobile graphic processing unit. This network detects pedestrian and face, classifies age and gender from detected face. Proposed network is constructed based on MobileNet, YOLOv2 and skip connection. Both detection and classification models are trained individually and combined as 2-stage structure. Also, attention mechanism is used to improve detection and classification ability. Nvidia Jetson Nano is used to run and evaluate the proposed system.
이차성 부갑상선 기능항진증과 연관되어 발생한 상완골의 갈색종 1예
서지원,고태경,홍종철,박헌수,Ji Won Seo,Tae Kyung Koh,Jong Chul Hong,Heon Soo Park 대한갑상선-내분비외과학회 2013 The Koreran journal of Endocrine Surgery Vol.13 No.2
Brown tumor is a bone disease that arises in the setting of increased osteoclastic activity and fibroblastic proliferation in the involved bone. It is well recognized as serious complication of hyperparathyroidism. Brown tumor is uncommon, and brown tumor with secondary hyperparathyroidism resulting from chronic renal failure has rarely been reported. We recently experienced a case of a 28-year-old Korean woman with chronic renal failure caused by chronic glomerulonephritis, on hemodialysis for nine years. She has been hospitalized with left shoulder pain for two years. Image studies showed multiple cystic masses, and both suspicious marked thinning and partial destruction of the cortex on the head of the left humerus. Histopathologic analysis of the mass lesion showed a fibrotic capsule, hemosiderin pigmentation, and giant cell, all characteristic of brown tumor. A subtotal parathyroidectomy was done without surgery of the bony lesion (brown tumor), with successful results. We report this case with a brief review of the literature.
4세 이상의 부분조절내사시에서 수술방법에 따른 결과 비교
서지원,이주연,백혜정,Ji Won Seo,Joo Yeon Lee,Hae Jung Paik 대한안과학회 2013 대한안과학회지 Vol.54 No.7
Purpose: To compare postoperative outcomes according to surgical method in partially accommodative esotropia in patients over 4 years of age. Methods: We compared motor and sensory outcomes between conventional and augmented surgery in 66 patients. The postoperative follow-up period was at least 24 months. The formula for the amount of the rectus muscle recession was based on the distant angle deviation after hyperopic correction in the conventional group and the average amounts of the distant angle deviation with and without full correction of hyperopia in the augmented group. In addition, the conventional group was divided into 2 sub-groups to compare surgical outcomes. The A group consisted of patients who underwent surgery with the amount of surgical correction based on distant angle deviation after full hyperopic correction. The B group consisted of patients under the same condition after reduced hyperopic correction to achieve best corrected visual acuity (BCVA). Results: Among the patients who had an ocular alignment less than 10 PD, orthophoria was significantly higher in the conventional group than in the augmented group on the last follow-up. When comparing the 2 conventional sub-groups, the postoperative stereoacuity was better in group B than in group A. Among patients with a postoperative overcorrected alignment of more than 10 PD who underwent augmented surgery, 75% showed decreased postoperative stereoacuity compared to preoperative stereoacuity. Conclusions: In partially accommodative esotropia in patients over 4 years of age, conventional surgery compared to augmented surgery after reduced hyperopic correction is better in order to achieve BCVA for postoperative stereoacuity as well as ocular alignment.
서지원 ( Ji-won Seo ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.2
다수의 개발자들이 참여하는 프로젝트에서 개발자들의 의해 동일한 기능유사한 코드가 생성된다. 이것은 시스쳄 전체적으로 중복 코드가 생성되어 시스템 성능에 영향을 준다. 또한 개발자의 능력에 따라 화며늬 응답속도 및 제이터베이스 처리 속도에 타이가 나게 되어 결국 시스템에 악영향을 끼티게 된된다. 이러한 문제는 개발자들의 의사소통을 위한 표준개발 도구를 활용함으로써 헤결가능 하다. DBC Editor 는 이클립스 플러그인 기반으로 기동되어 OS 에 영향을 받지 않고 기느별로 독립적인 플러그인을 구성하여 확장 가능하다. 또한쿼리만을 관리하므로 시스템이 유연해지며 개발자들은 표준화 된 코드개발이 가능하여 개발 생산성을 향상시킬수 있다.
서지원(Ji-Won Seo),양정직(Jeong-Jik Yang),김진호(Jin-Ho Kim),임종완(Jong-Wan Lim) 한국가스학회 2017 한국가스학회지 Vol.21 No.3
국내 CNG Bi-fuel Kit를 개조한 차량들은 대부분 Diaphragm 감압방식을 적용한 기계식 레귤레이터를 장착하여 운행 중에 있다. 하지만 Diaphragm의 재질 특성 및 기계식 압력제어 방식의 특성 상 다양한 문제점들이 발생되고 있으며, 이를 개선하기 위한 연구들이 진행되고 있다. 본 연구에서는 CNG 차량용 레귤레이터의 압력제어방식에 따른 성능특성 확인 및 비교 분석 진행을 통해 개선방안을 도출하고자 하였다. 실험 결과에 따르면 Diaphragm을 적용한 감압방식이 Piston을 적용한 방식보다 일반적인 성능에서 유리하였으나 주변 온도환경 변화에 따른 변동 폭이 큰 것을 확인하였다. 또한 전자식 압력제어를 통해 레귤레이터의 일반적인 성능을 향상시킬 수 있음을 확인하였다. The domestic vehicles remodeling the “CNG Bi-fuel Kit” are mostly in operation with installing the mechanical regulator applying the Diaphragm. However, due to the material characteristics of Diaphragm and characteristics of mechanical pressure control method, various problems are happening. This study tries to deduce the improvement plan through the checking of performance characteristics according to the pressure control method of CNG regulator and progress of comparative analysis. According to the test result, the decompression method applying the Diaphragm has advantage compared to the method applying the Piston. Furthermore, it was confirmed that through the electronic pressure control, it is possible to improve the general performance of the regulator.