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전력전자기술을 활용한 전기자동차 급속충전기 개발 및 소개
전성수(Sung-Soo Jeon),이교범(Kyo-Beum Lee) 대한전기학회 2020 전기의 세계 Vol.69 No.5
본 고에서는 전력전자기술을 활용한 전기자동차 급속충전기의 구성 및 고효율 전력변환 장치를 소개한다. This article introduces the configuration and high-efficiency power conversion devices of the electric vehicle (EV) fast charger using the power electronics technology
Back-to-Back 컨버터를 이용한 수차 발전 시스템의 직류단 전압 변동 저감
전성수(Sung-Soo Jeon),박영수(Yeongsu Bak),이교범(Kyo-Beum Lee) 대한전기학회 2019 전기학회논문지 Vol.68 No.9
This paper proposes minimization method of DC-link voltage variation in a hydraulic turbine generation system using back-to-back (BTB) converters. When the generation power is drastically changed, it causes the variation of the DC-link voltage. It deteriorates stability and efficiency of the hydraulic turbine generation system. This paper describes how the compensation current is calculated to reduce the variation of the DC-link voltage. The stability and efficiency of the hydraulic turbine generation system can be improved through the proposed compensation current. The proposed method was verified through the simulation and experimental results.
Predictive Factors for Acute Urinary Retention After Transperineal Template-Guided Mapping Biopsy
Si Hyun Sung(성시현),Chung Un Lee(이충언),Jae Hoon Chung(정재훈),Wan Song(송완),Minyong Kang(강민용),Hyun Hwan Sung(성현환),Byong Chang Jeong(정병창),Seong Il Seo(서성일),Seong Soo Jeon(전성수),Hyun Moo Lee(이현무),Hwang Gyun Jeo 대한비뇨기종양학회 2021 대한비뇨기종양학회지 Vol.19 No.3
Purpose: We investigated the predictive factors for acute urinary retention (AUR) after transperineal template-guided mapping biopsy (TTMB). Materials and Methods: We retrospectively reviewed the records of 459 patients who had undergone TTMB between May 2017 and July 2020. Overall complications after TTMB were analyzed and categorized according to the Clavien-Dindo classification. Factors that were likely to affect AUR were analyzed using a logistic regression model. Results: Overall complications after TTMB were observed in 95 of the 459 patients (20.7%), of which AUR was the most commonly reported (17.4%, n=80), followed by hematuria (3.1%, n=14). Hematuria in one patient was categorized as Clavien-Dindo grade IIIa. All remaining complications were Clavien-Dindo grade I. In the multivariate regression model, age ≥65 (odds ratio, 2.44; 95% confidence interval [CI], 1.42–4.17; p=0.001), prostate volume ≥30 mL (odds ratio, 3.72; 95% CI, 1.19–11.62; p<0.02), and number of biopsy cores ≥30 (odds ratio, 2.89; 95% CI, 1.29–6.43; p=0.01) were identified as the predictors for AUR after TTMB. Conclusions: AUR is the most common complication after TTMB. Age ≥65 years, prostate volume ≥30 mL, and number of biopsy cores ≥30 were significant predictors of AUR following TTMB.
단일기관에서 시행한 1,002예의 로봇보조복강경하 부분신장절제술의 주술기 및 종양학적 결과
김태진(Taejin Kim),정재훈(Jae Hoon Chung),성현환(Hyun Hwan Sung),전황균(Hwang Gyun Jeon),정병창(Byong Chang Jeong),전성수(Seong Soo Jeon),이현무(Hyun Moo Lee),강민용(Minyong Kang),서성일(Seong Il Seo) 대한비뇨기종양학회 2021 대한비뇨기종양학회지 Vol.19 No.3
Purpose: To analyze and compare the results of robotic partial nephrectomy (RPN) at a single center with the previous large-scale studies in terms of perioperative and oncological outcomes. Materials and Methods: We retrospectively evaluated 1,013 cases of RPN in our center database from December 2008 to August 2018. Total 11 cases were excluded in final analysis. We evaluated perioperative outcomes as the Trifecta achievement, which is defined as no positive surgical margin (PSM), no perioperative complications greater than Clavien-Dindo classification I and a warm ischemia time of <25 minutes. In addition, we analyzed pathological and oncological outcomes; recurrence, metastasis, all-cause deaths, cancer-specific deaths, and 5-year survival rates. Results: In 1,002 cases, the Trifecta achievement was 61.1% (n=612). The postoperative complication was 18.4% (n=184) but most were grade 2 or less (14.9%, n=145). Ninety-three cases (9.28%) had benign and 907 cases (90.5%) had malignant pathologies. A local recurrence were 14 cases (1.54%) and distant metastasis were 20 cases (2.2%) during follow-up periods. All-cause death rate was 1.2% (n=11) and cancer-specific death rate was 0.2% (n=2). The median follow-up period was 39 months. A 5-year recurrence-free survival rate, cancer-specific survival rate, and overall survival rate were 95.2%, 99.7%, and 98.4%. Conclusions: In summary, our data shows comparable perioperative outcomes to other large-scale studies of RPN in terms of the Trifecta achievement with similar baseline characteristics. In terms of oncological outcomes, there was lower rate of PSM and similar recurrence free survival rate.