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오승엽(Seung Yeop Oh),최새별(Sae Byul Choi),김애리(Ae Ree Kim),엄준원(Jun Won Um),문홍영(Hong Young Moon) 대한외과학회 2007 Annals of Surgical Treatment and Research(ASRT) Vol.72 No.4
Primitive neuroectodermal tumors (PNET) usually arise in the brain and central nervous system, but rarely occur outside of the brain, such as in the limbs, pelvis, paravertebral region or chest wall. Herein, a case of PNET on the buttocks is reported. A 24-year-old female was admitted for evaluation of a mass on her left buttock. An incisional biopsy revealed a primitive neuroectodermal tumor, with focal neural differentiation histologically. Preoperative MRI demonstrated the tumor was located in the subcutaneous layer of the left perineum, and extended to the ischiorectal fossa. The lesion showed an irregular, but well defined border; however, the differentiation from the left posterior wall of anus was focally obliterated. On operation, the tumor was not adhered to the surrounding structure, except for the external anal sphincter. The mass was completely resected. The tumor was about 8×9×5.8 ㎝ in size, and the pathological evaluation confirmed a PNET, with a free anal sphincter margin. Therefore, chemoradiation therapy was planned, but the tumor recurred two months later. It was recommended the patient undergo a re-resection, but was lost before the procedure could be undertaken.
오승엽 ( Seung-yeop Oh ),김나연 ( Na-yeon Kim ),이유림 ( Yu-rim Lee ),이수빈 ( Su-bin Lee ),장진이 ( Jin-lee Jang ),이기영 ( Ki Young Lee ) 한국정보처리학회 2023 한국정보처리학회 학술대회논문집 Vol.30 No.2
드럼 연습 및 연주를 쉽게 배우고 즐기기 위한 시각적 가이드를 제공한다. CNN과 OpenCV를 활용하여 악보의 음표 이미지를 처리하고, 데이터 수집, 전처리, 모델 학습, 서버와 안드로이드 애플리케이션 연동 등 다양한 과정으로 구현된다. '드럼라이트'는 드럼 연주의 접근성을 높이고, 다른 악기와 음악 학습 분야에도 확장 가능한 가능성을 제시한다.
오승엽(Seung-Yeop Oh),최재성(Jae-Sung Choi),손병락(Byung-Rak Son),이동하(Dong-Ha Lee),유준혁(Joonhyuk Yoo) 한국정보과학회 2012 한국정보과학회 학술발표논문집 Vol.39 No.1A
생체모방로봇은 인간을 비롯하여 새, 곤충, 물고기 등 동물들의 기본구조, 행동원리 및 메커니즘을 모방한 로봇이다. 정찰, 수색, 테러진압 등 군사작전에서부터 인명구조까지 생체모방로봇은 인간의 눈과 발을 대신하여 인간이 접근할 수 없는 오염 지역을 면밀히 탐지하는 데에도 유용하리라 예상된다. 이와 같은 생체모방로봇이나 MAV등을 실시간으로 원격에서 모니터링하고 제어할 수 있는 DAQ 시스템의 중요성이 커지고 있다. 본 논문에서는 생체모방로봇인 가오리를 원격 관제 센터에서 RF무선통신을 이용하여 안정적인 제어 및 모니터링이 가능한 DAQ(Data AcQuisition) 시스템을 제안한다.
오승엽(Seung Yeop Oh),김도윤(Do Yun Kim),박종민(Jong Min Park),박승현(Seung Hyun Park),서광욱(Kwang Wook Suh) 대한외과학회 2008 Annals of Surgical Treatment and Research(ASRT) Vol.74 No.3
Purpose: This study was conducted to determine whether a learning curve is necessary to obtain a successful total mesorectal excision (TME) for mid or low rectal cancer. Methods: We retrospectively reviewed the records of 80 patients that underwent a total mesorectal excision for mid or low rectal cancer between 1994 and 1998 and between 1999 and 2002. We compared the results between the two period groups. Endpoints were postoperative urological functions and the local recurrence rate. Results: There was no significant difference for age, gender, tumor differentiation and stage between patients in the two groups. Local recurrence (LR) developed in 23% of patients in the early group and 7.5% of patients in the late group. The cumulative LR risk at 60 months was 27.5% for the early period group and 9.9% for the late period group (P=0.082) and the difference between the two groups was significant for TNM Ⅲ stage (29.8% vs. 9.8%, P=0.049). Postoperative urological complications were not significantly different between the two groups (P=0.75). Conclusion: Based on these results, TME seemed to require a learning curve. In clinical trials for rectal cancer surgery, the learning curve for qualified surgery from the standpoint of oncological outcome should be considered to minimize bias due to surgeon-associated factors. A more broad application of the TME concept to a larger number of patients with mid or low rectal cancer is warranted.
이승환(Seung Hwan Lee),오승엽(Seung Yeop Oh),백옥주(Ok Joo Baek),김영배(Young Bae Kim),서광욱(Kwang Wook Suh) 대한외과학회 2009 Annals of Surgical Treatment and Research(ASRT) Vol.77 No.4
Purpose: Adequate lymph node analysis is critical for appropriate staging in colorectal cancer. The aim of this study is to determine whether 12 or more nodes recovered in stage Ⅲ rectal cancer results in improved oncologic outcomes. Methods: Two hundred and forty-eight patients with stage Ⅲ rectal cancer from 1995 through 2004 were reviewed. They were categorized into 2 subgroups by the number of nodes retrieved (<12 and ≥12), and oncologic outcomes in terms of 5-year overall and disease-free survival were analyzed for all patients, patients with American Joint Committee on Cancer (AJCC) N1 disease (N=145), and those with AJCC N2 (N=103). Results: Five-year overall and disease-free survival was 79.0% and 58.4%, respectively. There was no significant difference in clincopathologic features between <12 retrieval group and ≥12 group. Although there was significant difference in overall survival and disease-free survival between the number (<12 and ≥12) of lymph nodes removed in N2 disease (P=0.043; P=0.022) in univariate analysis, the total number of lymph nodes retrieved was not a prognostic factor affecting survival in multivariate analysis. The N2 stage and lateral margin involvement were prognostic factors affecting survival in multivariate analysis. Conclusion: This study showed that the total number of lymph nodes analyzed for stage Ⅲ rectal cancer is not a prognostic factor on overall or disease-free survival in multivariate analysis.
근위부 조기위암에서 복강경보조 위전절제술식과 개복하위전절제술식의 비교
박종민(Jong-Min Park),오승엽(Seung-Yeop Oh),차진우(Jin-Woo Cha),최수윤(Su-Yun Choi),이호원(Ho-Won Lee),김홍(Hong Kim),정인호(In Ho Jeong),진성호(Sung-Ho Chin),김명욱(Myung-Wook Kim),조용관(Yong Kwan Cho),한상욱(Sang-Wook Han) 대한외과학회 2007 Annals of Surgical Treatment and Research(ASRT) Vol.72 No.4
Purpose: The purpose of this study was to compare the short-term clinical outcomes of laparoscopy-assisted total gastrectomy (LATG) with conventional open total gastrectomy (OTG) for treating proximal early gastric cancer and to determine the usefulness of the LATG procedure. Methods: The records of 21 patients who underwent LATG for proximal early gastric cancer from January 2004 to August 2006 were retrospectively reviewed and compared with those records of 20 patients who underwent OTG during the same period. Results: The patient characteristics, including gender, age, body mass index and comorbidities, were similar between the two groups. Combined resections were more frequently done in the OTG group than in the LATG group. The blood loss in the LATG group was significantly less than that in the OTG group. The operating time, time to first flatus and initial oral intake and the postoperative hospital stay were significantly shorter in the LATG group. The number of resected lymph nodes, lymph node metastasis, histologic type, TNM stage, complications, leukocyte counts and serum lactic acid levels were not significantly different between the two groups. Conclusion: LATG is a technically safe and feasible procedure for treating proximal early gastric cancer. Prospective multi-center trials are necessary to establish LATG as the standard treatment for proximal early gastric cancer.