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박순옥(Soonok Park),유정훈(Jeonghoon Yoo),민승재(Seungjae Min) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.7
본 논문은 밀도법을 기반으로 한 자기포화 효과를 고려한 수직자기 기록장치의 위상최적 설계 방법을 제안한다. 자기장 내의 위상최적화 과정에서 자기 저항률의 값은 민감도 해석 결과에 따른 요소의 밀도값 변화에 의거하여 결정된다. B-H 곡선에 따른 자기 저항률의 값은 물성치의 비선형성을 나타낸다. 일반화된 응답 함수의 민감도는 자기장의 비선형 특성을 고려하여 보조 변수법에 의해 표현되고, 설계의 목적 함수는 기록 영역의 자기에너지를 최대화하는 것으로 설정된다. 선형과 비선형의 최적화의 수치 연구의 결과는 비선형의 효과를 나타내고 있다. This paper proposes a density method based topology optimization of a perpendicular magnetic recording system design in which the saturation effect is taken into account. During the topology optimization process in magnetic fields, the magnetic reluctivity is updated in accordance with the changes in element density determined by a sensitivity analysis. The magnetic reluctivity is determined from a B-H curve and is used to represent nonlinear material property, i.e., the saturation effect. The sensitivity for a generalized response functional is formulated using the adjoint variable method in which the nonlinear property is taken into account and the objective function is set such that the magnetic energy in the media is maximized. Effects due to the nonlinear property can be observed from a numerical study in which the linear and the nonlinear topology optimization results are compared.
박순옥(SO Park),김원기(WK Kim),강희운(HW Kang),김창이(CY Kim) 대한산부인과학회 1977 Obstetrics & Gynecology Science Vol.20 No.12
저자들은 1975년 2월 가톨릭의과대학 부속 성모자애병원에서 수술후 병리학적으로 확진된 원발성 난관암을 치료하였기에 문헌고찰과 함께 보고한다. Primary carcinoma of the fallopian tube is the rarest tumor of the female reproductive organs. We expenienced a patient of primary carcinoma of the fallopian tube who was admitted to our Ob. & Gy. Dept. under the impression of the ovarian tumor. After laparotomy, we confirmed pathologically egg-sized primary carcinoma on the right fallopian tube. We present this tumor with brief review of literatures.
박순옥(Soonok Park),최재석(Jae Seok Choi),유정훈(Jeonghoon Yoo) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The magnetic recording system shows the difference of the magnetic recording density according to the direction of the magnetic field. The yoke shape of the recording system affects the magnetic field direction; therefore, the recording density may be raised by changing the shape. This paper intends not only to increase the magnetic flux density of the record region but also to reduce the recording loss of a specific region through the simultaneous design of the yoke and the magnet. The recording loss can be reduced by minimizing the magnetic flux of the adjacent area to the recording region. The topology optimization method is used to obtain the optimal shape both of the yoke and the magnet. And the commercial package, Maxwell is used to verify the result.