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Successful Endoscopic Mucosal Resection of a Low Esophageal Carcinoid Tumor
임창섭,박선자,박무인,문원,김형훈,이준식,김봉진,구동영 대한소화기내시경학회 2013 Clinical Endoscopy Vol.46 No.5
Esophageal carcinoid tumors remain some of the rarest of all carcinoid tumors, with only several cases previously reported in the literature. The endoscopic mucosal resection of selected carcinoid tumors has been shown to be a valid, safe, and effective method of treatment. Endoscopic ultrasonography is the technique of choice to select patients eligible for endoscopic resection. Here, we report successful endoscopic mucosal resection of a low esophageal carcinoid tumor and review the relevant literature. The present case is the first reported case of esophageal carcinoid tumor in Korea.
새로운 방식의 PFC Single Stage Full Bridge AC/DC Converter
임창섭,권순걸 한국융합신호처리학회 2002 융합신호처리학회 논문지 (JISPS) Vol.3 No.3
본 논문은 새로운 단일 전력단 역률보상 풀 브리지 컨버터를 제안하였다. 제안된 컨버터는 역률보상을 위하여 앞단에 2개의 인덕터, 2개의 다이오드, 2개의 자성결합 변압기를 가진 2VS 풀브리지 DC/DC 컨버터로 구성되어 있다. 이러한 구성방법에 의해 전력은 전원에서 분리되고, 안정된 직류출력전압을 얻을 수 있다. 이 토폴로지에서 주소자의 전압스트레스는 영전압스위칭에 의해서 감소되며, 또한 제안된 컨버터는 능동 역률보정 스위치와 제어 및 게이팅 보드와 같은 보조회로가 필요치 않게되어 규격과 단가를 낮출 수 있을 뿐 아니라 효율을 증가시킬 수 있다. This paper proposes new single stage power factor correction (PFC) full bridge converter. The proposed converter is combined previous ZVS full bridge DC/DC converter with two inductors, two diodes, two magnetic coupling transformer for PFC. This process of power is isolated from the source and also regulate stable DC output voltage in a category. In this topology, the voltage stress of main switches is reduced by zero voltage switching. Moreover, the proposed converter doesn't need active PFC switch and auxiliarly circuits, like control and gating board, so it could decrease the size and cost and increase the efficiency.
임창섭,권순걸 慶南大學校 附設 工業技術硏究所 2002 硏究論文集 Vol.20 No.-
연구한 단일전력단 역률보상컨버터는 풀브리지 DC/DC컨버터와 두 개의 변압기 보조권선과 그리고 두 개의 소형 인턱터와 다이오드로 구성되어 있다. 본 회로는 부가적인 능동 스위치나 제어회로를 첨가하지 않고서도 역률조정기능을 수행하게 되어 제작비가 저렴하게 된다. 제안된 회로를 컴퓨터 시뮬레이션과 1.2KW, 100KHz의 실험장치로 실험을 통하여 그 타당성을 입증하였다. This paper proposes a new single stage power factor correction (PFC) full bridge converter which operates at continuous conduction mode(CCM). The proposed single stage PFC consists of typical zero voltage switching(ZVS) full bridge DC/DC converter, two transformer auxiliary windings, and two small inductors, and two diodes. Neither additional active switch nor any control circuit are added for PFC resulting in very low cost. The proposed converter provides input power factor correction with CCM control and tight output voltage regulation. Operation principle and analysis are explained and verified with computer simulation and experimental results on a 1.2kW, 100kHz prototype.
임창섭,이승은,윤유석,안영준,한호성,김선회,김상걸,윤영국,한성식,박상재,임태진,강구정,심문섭,최성호,허진석,최동욱,허경열,이동식,윤성수,김홍진,조철균,김현종,유희철,조백환,송인상,장진영 대한의학회 2011 Journal of Korean medical science Vol.26 No.6
Prediction of malignancy or invasiveness of branch duct type intraductal papillary mucinous neoplasm (Br-IPMN) is difficult, and proper treatment strategy has not been well established. The authors investigated the characteristics of Br-IPMN and explored its malignancy or invasiveness predicting factors to suggest a scoring formula for predicting pathologic results. From 1994 to 2008, 237 patients who were diagnosed as Br-IPMN at 11tertiary referral centers in Korea were retrospectively reviewed. The patients’ mean age was 63.1 ± 9.2 yr. One hundred ninty-eight (83.5%) patients had nonmalignant IPMN (81adenoma, 117 borderline atypia), and 39 (16.5%) had malignant IPMN (13 carcinoma in situ, 26 invasive carcinoma). Cyst size and mural nodule were malignancy determining factors by multivariate analysis. Elevated CEA, cyst size and mural nodule were factors determining invasiveness by multivariate analysis. Using the regression coefficient for significant predictors on multivariate analysis, we constructed a malignancy-predicting scoring formula: 22.4 (mural nodule [0 or 1]) + 0.5 (cyst size [mm]). In invasive IPMN, the formula was expressed as invasiveness-predicting score = 36.6 (mural nodule [0 or 1]) +32.2 (elevated serum CEA [0 or 1]) + 0.6 (cyst size [mm]). Here we present a scoring formula for prediction of malignancy or invasiveness of Br-IPMN which can be used to determine a proper treatment strategy.