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MIVB 용접용 개폐형 자속발생기에 의한 자원밀도분포의 수치해석
구진모,김재웅,Ku Jin-Mo,Kim Jae-Woong 대한용접접합학회 2004 대한용접·접합학회지 Vol.22 No.6
MlAB(magnetically impelled arc butt) welding is a sort of pressure welding method by melting two pipe sections with high speed rotating arc and upsetting two pipes in the axial direction. The electro-magnetic force, the driving force of the arc rotation, is generated by interaction of arc current and magnetic field induced from the magnetic flux generator in the welding system. In this study, an openable coil system for the generation of magnetic flux and a 3-dimensional numerical model for analyzing the electro-magnetic field were proposed. Through the fundamental numerical analyses, a magnetic concentrator was adopted for smoothing the magnetic flux density distribution in the circumferential direction. And then a series of numerical analysis were performed for investigating the effect of system parameters on the magnetic flux density distribution in the interested welding area.. Numerical quantitative analyses showed that magnetic flux density distribution generated from the proposed coil system is mainly dependent on the exciting current in the coil and the position of coil or concentrator from the pipe outer surface. And the gap between pipe ends and arc current are also considered as important factors on arc rotating behavior.
구진모,박창민,임정기,Gu, Jin-Mo,Park, Chang-Min,Im, Jeong-Gi 대한영상의학회 2003 대한영상의학회지 Vol.49 No.4
심 혈관종은 매우 드문 양성 심 종양이다. 저자들은 호흡 곤란을 주소로 내원한 환자에서 좌심방의 심근에 발생한 해면 혈관종을 경험하였다. 수술 전 조기 동맥기 CT에서 내부에 반점양 조영 증강의 병소를 갖는 좌심방에 부착된 경계가 좋은 종괴가 보였다. 지연기 CT에서는 주변의 혈관과 비슷한 정도의 강한 주변부 조영증강이 보였다. 종양 절제 후 2년 동안의 추구 관찰에서 환자의 임상 경과는 이상이 없었다. 저자들은 수술전 CT 소견과 함께 이 증례를 보고하고자 한다. Cavernous hemangioma is an uncommon benign tumor, with rare cardiac involvement. We encountered a patient with dyspnea in whom a cavernous hemangioma was located in the myocardium of the left atrium, and in whom preoperative CT demonstrated a well-demarcated mass attached to the left atrium. During the arterial phase, speckled enhancing foci were seen, and delayed-phase CT images depicted dense peripheral enhancement, similar to that of adjacent vessels. Mass resection of the tumor resulted in a satisfactory clinical course during the two-year follow-up period. We report this case, describing its preoperative CT findings.