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반응표면법을 이용한 집중권선 동기 릴럭턴스 전동기의 토크 리플 저감에 관한 회전자 설계
박중민(Jung-Min Park),김성일(Sung-Il Kim),홍정표(Jung-Pyo Hong),이중호(Jung-Ho Lee) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
This paper deals with the optimum rotor design solution on torque ripple reduction for a SynRM with concentrated winding using response surface methodology (RSM). The RSM has been achieved to use the experimental design method in combination with finite element method (FEM)and well adapted to make analytical model for a complex problem considering a lot of interaction of design variables. Comparisons are given with characteristics of a SynRM according to flux barrier number, flux barrier width variation, respectively.
반응표면법을 이용한 집중권선 동기 릴럭턴스 전동기의 토크 리플 저감에 관한 회전자 설계
朴重民(Jung Min Park),李重浩(Jung Ho Lee) 대한전기학회 2006 전기학회논문지 B Vol.55 No.12
This paper deals with the optimum rotor design solution on torque ripple reduction for a SynRM with concentrated winding using response surface methodology (RSM). The RSM has been achieved to use the experimental design method in combination with finite element method (FEM)and well adapted to make analytical model for a complex problem considering a lot of interaction of design variables. Comparisons are given with characteristics of a SynRM according to flux barrier number. flux barrier width variation. respectively.
장유진,박중민,김종한,박성수,김종석,목영재,Jang, You-Jin,Park, Jung-Min,Kim, Jong-Han,Park, Sung-Soo,Kim, Chong-Suk,Mok, Young-Jae 대한위암학회 2006 대한위암학회지 Vol.6 No.4
목적: 수술 전 측정이 가능한 종양의 크기는 위암의 중요한 예후 인자로 생각되고 있으며 크기가 큰 위암은 주위 장기 침범, 광범위 림프절 전이, 원격 전이 등을 동반한 진행성 위암으로 예후가 불량하다고 알려져 있다. 본 연구에서는 종양의 크기를 기준으로 하여 대형위암의 임상 병리학적 분석과 생존율에 영향을 주는 인자들을 분석하였다. 대상 및 방법: 1983년 9월부터 2001년 12월까지 고려대학교 외과학교실에서 위암으로 진단되어 절제술을 시행받은 2,260명을 대상으로 후향적 연구를 시행하였다. 대상군을 장경 8 cm를 기준으로 대형위암 335 (14.8%))예 소형위암 1,925예(85.2%)의 두 군으로 나누어 분석하였다. 대형위암의 임상 병리학적 특성을 분석하기 위하여 두 군 간의 임상 병리학적 인자들을 다변량 분석과 단변량 분석을 시행하였으며 생존은 COx proportional hazards model을 사용하였다. P<0.05인 경우를 통계학적으로 유의한 것으로 판정하였다. 결과: 종양의 위치(P<0.001), 수술 방법(P<0.001), 근치도(P<0.001), 위벽침윤도(P<0.001), 림프절 전이(P<0.001), 분화도(P<0.001) 그리고 타장기의 합병절제율(P<0.001)이 두 군간의 통계학적 차이를 보였다. 대형 위암의 생존율을 Cox proportional hazards model로 분석한 결과 림프절 전이(P<0.001), 근치도(P<0.001), 위벽 침윤도(P=0.010), 수술 방법(P=0.018)과 나이(P=0.033)가 통계적으로 유의한 독립적인 위험인자였다. 결론: 대형위암은 소형위암에 비해 진행된 소견을 보였다. 대형 위암에서 근치절제는 생존율을 향상시키는 매우 중요한 인자로 근치적 절제를 위해 노력이 필요하며 근치적 수술 가능성에 대한 좀더 정확한 수술 전 병기결정에 주의를 기울여야 할 것이다. Purpose: Tumor size has been reported to be one of the prognostic factors in the preoperative setting and 8 cm has been confirmed as a cut-off value for large gastric tumors with respect to postoperative complications. The aim of this study was to investigate the clinicopathologic features and the prognosis in patients with tumors larger than 8 cm in diameter. Materials and Methods: We retrospectively studied 2,260 patients with gastric cancer who underwent a gastrectomy from 1983 to 2001 at the Department of Surgery, Korea University College of Medicine. For a comparative analysis we divided the cases into the large and the small groups according to tumor size. The clinicopathological factors associated with large gastric tumors were analyzed by using univariate and multivariate analyses. To determine which variables were independent prognostic factors for overall survival, we applied the Cox proportional hazards model and we used P<0.05 as the cutoff value for statistical significance. Results: Univariate and multivariate analyses disclosed that tumor location (P<0.001), resection type (P<0.001), curability (P<0.001), depth of invasion (P<0.001), number of metastatic lymph nodes (P<0.001), differentiation (P<0.001) and combined resection (P<0.001) were significantly different between the two groups. The independent factors for survival identified by using the Cox proportional hazards model for large gastric tumors were nodal status (P<0.001), curative resection (P<0.001), depth of invasion (P=0.010), type of resection (P=0.018) and age (P=0.033). Conclusion: Large gastric tumors showed more aggressive local findings than their smaller counterparts. In patients with large gastric tumors, a curative resection was the most important factor for the prognosis. Therefore, we suggest that every effort should be made to do a curative gastrectomy and an accurate preoperative examination. (J Korean Gastric Cancer Assoc 2006;6:244-249)
유한요소법(FEM)과 프라이자흐모델을 사용한 동기형 릴럭턴스 모터의 센서리스 백터제어 제정수 산정
김홍석(Hong Seok Kim),박중민(Jung Min Park),이민영(Min Myung Lee),이중호(Jung Ho Lee),천장성(Jang-Sung Chun) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
This study investigates the dynamic characteristics of Synchronous Reluctance Motor (SynRM), with segmental rotor structure, using finite element method in which the moving mesh technique is considered. The focus of this paper is the sensorless vector control parameters estimation of SynRM under saturation and iron loss. Comparisons are given with dynamic characteristics of normal single B-H nonlinear solutions and those of proposed FEM & Preisach model of synchronous reluctance motor, respectively.
한국 유방암 환자의 체질량지수(BMI) 분포 및 부가 치료로서의 호르몬 치료에 미치는 영향
민연기(Youn Ki Min),박중민(Choong Min Park),김완배(Wan Bae Kim),조성진(Sung Jin Cho),김애리(Aeree Kim),김남렬(Nam Ryeol Kim),조민영(Min Young Cho),정석인(Suk In Jung),배정원(Jeoung Won Bae),구범환(Bum Hwan Koo) 대한외과학회 2002 Annals of Surgical Treatment and Research(ASRT) Vol.62 No.4
이도환(Do Hwan Lee),박성근(Sung-Geun Park),이선기(Sun Ki Lee),박중민(Jung Min Park) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
In this study, the applicability of Acoustic Emission(AE) for the detection of incipient pump cavitations IS examined. Two AE transducers are installed on casing and inlet pipe surfaces to look at which place is more sensitive to cavitations. For three fixed flow rate conditions. the AE RMS and variance signatures are obtained by varying NPSH. The possibility of AE RMS and variance features to identify the cavitation inception and starting of head drop points is demonstrated. Comparisons of RMS and variance signatures are made in the aspect of the appropriateness of cavitation detection. A digital high pass filtering technique is proposed to facilitate the detection of cavitations.