이청준 소설의 비판적 담론 연구

학위논문(석사)--서울대학교 대학원 :국어국문학과 현대문학전공,1999.Maste

Hybrid Position Detection Method Combining Hall Sensors and Sensorless Control for PMSM Drive

DoctorThis paper presents the transition method between Hall sensors based position detection method in a low speed region and back EMF based sensorless control in a high speed region. Thereby, the estimated rotor position has good attributes of the two methods. To achieve the seamless transition, the Gopinath model is considered. However, the general 2nd order Gopinath model does not provide the fast transition. In this paper, the 3rd order Gopinath model is proposed and phase compensation is added. As a result, a smooth and fast transition can be obtained, and the interference between two position detection methods is reduced. The effectiveness of the proposed method is demonstrated through simulation and experimental results

(A) study on mobility of Korean security analysts : perspectives on the sponsored mobility and contest mobility

Thesis(masters) --서울대학교 대학원 :경영학과(인사조직전공),2010.8.Maste

악성 소장 폐쇄 환자에서의 경공장 스텐트 설치술의 효용성

학위논문 (석사)-- 서울대학교 대학원 : 의과대학 임상의과학과, 2018. 2. 윤창진.목적: 악성 소장 폐쇄 (malignant small bowel obstruction)로 경공장 스텐트 설치술 (trans-jejunostomy stent placement) 을 받은 환자에서 임상적 효용성을 평가하고자 한다. 대상 및 방법: 2009 년 3 월부터 2016 년 12월까지 악성 소장 폐쇄로 진단 받은 23 명의 환자를 대상으로 한다. 20 명은 한 군데, 3 명은 두 군데 소장 폐쇄가 있었다. 우선 악성 소장 폐쇄 부위의 30–100 cm 상방에 공장 창냄술을 시행했고, 직후 해당 창냄술 부위를 통해 스텐트 설치술을 시행했다. 기술적 성공 여부, 소장의 감압 여부, 장 폐쇄 증상 호전 (3 단계 평가) 및 식이 진행 여부 (4 단계 평가), 시술 부작용 여부에 대해 후향적 관찰 연구를 시행했다. 결과: 스텐트 설치술은 22명의 환자에서 기술적으로 성공했다 (95.7%). 장 폐쇄 증상은 시술 2 주 후 부분 호전 (9명) 혹은 완전 호전 (13 명) 되었다. 소장의 감압은 소장조영술 (21명) 과 전산화단층촬영 (16명) 에서 확인되었다. 식이 진행은 세 단계 (1명), 두 단계 (7명), 한 단계 (14명) 호전되었다 (P<0.0001). 중등도 부작용은 3명의 환자에서 발생했으며 (13.0%), 2 명의 환자에서 국소 복막염, 1명의 환자에서 장 천공이 발생했고 보존적 치료 후에 호전되었다. 결론: 경공장 스텐트 설치술은 악성 소장 폐쇄 환자에서 높은 치료 효과를 보였다. 95.7%의 환자에서 기술적 성공을 보였으며, 이에 따른 임상 증상의 호전도 보였다. 시술 부작용은 드물지 않지만, 보존적 치료로 호전되었다.Purpose: To evaluate the clinical effectiveness of trans-jejunostomy stent placement in patients with malignant small bowel obstructions (MSBO). Materials and Methods: Between March 2009 and December 2016, 23 patients (20–81 years) with one (n=20) or two (n=3) MSBO from advanced abdominal and pelvic malignancies were enrolled. Percutaneous jejunostomy was created at 30–100cm upstream to MSBO, immediately followed by stent placement through the jejunostomy stoma at the same session. A retrospective analysis was conducted for technical success, bowel decompression, improvement of obstructive symptoms (3-point scale) and food intake capacity (4-point scale), and procedure-related complications. Results: Stent placement was technically successful in 22 patients (95.7%). Obstructive symptoms improved by partially (n=9) or completely (n=13) within 2 weeks after the procedure. Bowel decompression was confirmed by enterography (n=21) and CT (n=16). Food intake capacity improved by 3 (n=1), 2 (n=7), and 1 point (n=14) (p<.0001). Major complications (n=3, 13.0%) including localized peritonitis (n=2) and bowel perforation (n=1), which were successfully treated conservatively. Conclusions: Trans-jejunostomy stent placement is an effective treatment in patients with MSBO. It is technically feasible in most patients (95.7%) and provides substantial symptomatic improvement. Procedure-related complications are not uncommon, but can be managed conservatively.I. Introduction 1 II. Materials and methods 4 A. Patients 4 B. Procedures 5 C. Follow-up 7 D. Analysis 8 III. Results 10 A. Technical and clinical success 10 B. Complications 11 C. Follow-up 12 IV. Discussion 14 V. Reference 19 VI. Abstract (in Korean) 38Maste

3-D line reconstruction from large relative displacement

Maste

Dynamic Overmodulation Method for Fast Current Response of IPMSM

MasterPI current controllers constrain the voltage command in a linear region for stable operation. However, a sudden current command let the voltage command be out of the linear region. In this situation, an inverter cannot produce enough voltage so that current control is seriously unstable, thus, the overmodulaton method is necessary. The overmodulation method modifies the voltage command on the hexagon shaped voltage limit. Even though the overmodulation method is used, if the voltage command is out of the limit for a long time, errors are accumulated in the current controllers so that current control becomes unstable. Therefore, the overmodulation method for fast current response is essential, but most conventional overmodulation methods do not consider fast current response. In this paper, new dynamic overmodulation for fast current response using unbalanced voltage. The method is considered on the rotating frame, and q-axis is reduced in priority, which is effective for fast current response. The proposed method is verified through simulations and experimental results

Speed ripple reduction of PMSM with eccentric load using sinusoidal compensation method

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Direct observation of sub-ns frequency correlation decay component in dye dissolved solution system

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