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자석 형상 최적화를 통한 축방향 이상 횡자속형 전동기의 토크 특성 향상에 관한 연구
안희태(Ahn, Hee-Tae),장건희(Jang, Gun-Hee) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.10
Transverse flux machine(TFM) has been developed to drive a machine of large input power at low-speed. However, it has complicated structure and large torque ripple due to its inherent structure. In this paper the characteristics of torque of a rotatory two-phase TFM are analyzed by using the 3-dimensional finite element method and optimal design. This research shows that one of the effective design variables is the skew angle of permanent magnet. The skew angles of permanent magnet are optimized by using a genetic algorithm. It also shows that the proposed optimal skew magnet not only increases average torque but also decreases torque ripple of a rotatory two-phase TFM.
이종희 ( Jong Hee Lee ),안희태 ( Hee Tae Ahn ),이동윤 ( Dong Youn Lee ),조광현 ( Kwang Hyun Cho ) 대한피부과학회 2001 大韓皮膚科學會誌 Vol.39 No.9
N/A Background : Seborrheic keratosis(SK) is a benign epidermal tumor histopathologically composed of basaloid cells and squamous cells. Objective : We investigated the mode of expression of various epidermal differentiation markers in SK. Methods : Twenty two cases of pathologically confirmed SK were collected from the pathologic files. The histological types included acanthotic type (19 cases) and reticulated type (3 cases). Immunohistochemical staining to various cytokerntins(CK), involucrin, loricrin and filaggrin was performed. Results : Two expression patterns of CK 1 were observed. There was diffuse homogeneous expression of CK 1 in squamous cells in 14 crises and in 8 cases heterogeneous expression with immunorective cells scattered among nonimmunoreactive cells to CK 1. Immunoreactivities to CK 14 were observed in basaloid cells. CK 6 was expressed in entire epidermis including basal layer in 19 taxes. But stronger expression of CK 6 was expressed in squamous cells than in basaloid cells. In 3 cases immunoreactive cells to CK6 were squamous cells in spinous and granular layer. CAM 5.2 was focally expressed in basaloid cells only in e case. Expression of involucrin was observed in squamous cells in upper spinous and granular layer.Loricrin and filaggrin were expressed linearly in only uppermost granular layer or with horny layer. Conclusion : CK expressions in SK suggest that differentiation process from basaloid cells to squamous cells is the same as that of from basal cells to sqamous cells in the suprabasal epidermis. Squamous cells of SK are activated keratinocytes which proceed normal keratinization with normal involucrin expression although terminal differentiation is presumptive to be slightly retarded because of decreased expression of loricrin and filaggrin.
서현석(Hyun-Seok Seo),조중열(Jung-Yol Jo),안희태(Hee-Tae Ahn),최연익(Yearn-Ik Choi) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
원통형 PN접합의 Baliga의 해석적인 항복전압에 대한 근사식을 유도하였다. 근사식은 접합깊이, r<SUB>j</SUB>와 공핍층 깊이, W<SUB>pp</SUB>의 비 (r<SUB>j</SUB>/W<SUB>pp</SUB>)가 0.1보다 작은 경우 Baliga식과 잘 일치하였다. 농도에 대한 원통형 접합의 항복전압의 민감도를 유도하였으며, 근사식을 사용한 경우가 Baliga식의 경우보다 민감도식이 더 간단하기 때문에, 민감도를 고려한 소자 설계 시 활용될 수 있으리라 기대된다. 민감도 식을 이용하여 설계한 결과 항복전압의 편차가 10%이내로 제어하기 위해서는 도핑농도가 10¹?㎝?³이고 접합깊이가 5 ㎛인 원통형 접합인 경우 농도 편차가 12.8%이내 이어야한다.
조광현,이종희,이동윤,안희태 대한피부과학회 2001 大韓皮膚科學會誌 Vol.39 No.3
We examined the amyloid deposits in seborrheic keratosis by using Dylon stain. Histochemically identified amyloid deposits in seborrheic keratosis were studied with monoclonal cytokeratin antibodies. Amyloid deposits were detected in 2 of 22 seborrheic keratosis. Anti-keratin antibody 34βE12 reacted with amyloid deposits shown by Dylon stain in 2 of 22 seborrheic keratosis. Anti-keratin antibody 34βB4 did not react with amyloid deposits