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RISS 인기검색어
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- 저자 : 강민영(M. Y. Kang) (검색결과 2 건)
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대형유도전동기용 단락고리 제조를 위한 구리의 냉간 링롤링 공정설계 연구
이성원(S. W. Lee),조재완(J. W. Jo),강민영(M. Y. Kang),이정민(J. M. Lee) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
The large end rings for generators have been mostly manufactured by bending in a circle, welding and machining of a long copper square bar in order. However, these welded parts can not only occasionally contain various welding defects that are hydrogen embrittlement, residual stresses, cracks and inclusions but also lead to electrical discontinuity within the end ring. To solve these problems, this study proposed the new manufacturing method which contains a ring rolling process to make an initial material into a ring preform. The initial material is produced into ring shape by a centrifugal casting method and a subsequent machining. The ring preform is machined into final desired dimensions. The typical defects of the ring rolling process are the uniform deformations of ring shape and the fishtail of its section. They are very sensitive to the process variables like an initial and a desired ring geometry, a ring-growth-rate, an axial stand and a rolling curve (ratio between height reduction rate in axial gap and mandrel feed rate). Thus, this paper was design to investigate the effect of the different process parameters on the dimensions of the ring preform during ring rolling process using Finite element analysis.
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손시환,권오섭,백규흠,정원,조은정,강민영 한국동물자원과학회 2003 한국축산학회지 Vol.45 No.6
Using the G-, C-, and NOR-banding techniques, a karyotyping for Korean native Pig was performed. Blood samples were collected from 50 male Korean Native Pigs that had been bred at the National Livestock Research Institute and then blood cells were prepared from in vitro cultures followed by karyotyping ; G-, C-, and NOR-banding patterns of metaphase chromosomes were analyzed. The karyotype of Korean Native Pig is 38, XX or XY which consists of 5 pairs of submetacentric chromosomes(Group Ⅰ), 2 pairs of acrocentric chromosomes with short p-arm(Group Ⅱ), 5 pairs of medium metacentric chromosomes(Group Ⅲ), 6 pairs of acrocentic chromosomes(Group Ⅳ) and metacentric X and Y sex chromosomes. On GTG-banding, the Korean Native Pig exhibited a typical and identical banding pattern in each homologous chromosomes. Overall chromosomal morphology and positions of typical landmarks of the Koreans Native Pig were virtually identical chromosomal morphology and positions of typical landmarks of the Korea Native Pig were virtually identical to those of Committee for the Standardized Karyotype of the Domestic Pig(CSKDP). However, numbers of G-bands of the Korean Native Pig chromosomes were more than those of CSKDP. In chromosomes 1, 3, 5, 6, 7, 8, 13, 14, 15, 16, 17, 18 and X, the Korean Native Pig exhibited more separated bands as compared with CSKDP. In C-banding patterns, although the quantity of heterochromatin was variable in each chromosome, most of the Korean Native Pig chromosomes had heterochromatic C-bands on centromeres. However, the heterochromatic C-band was constantly observed on the whole Y chromosome. In AgNOR staining, the NORs were located at centromeres on the chromosomes 8 and 10. The number of NORs per metaphase ranged from 2 to 4 giving a mean value of 2.13. The number of NORs wer distributed on all chromosome pair 10 but not on chromosome 8. The sizes of NORs were also differed between homologous chromosomes 8. Numbers of NORs of Korean Native Pig were significantly higher than those of Yorkshire. The pattern of pig NORs was polymorphic in breeds, individuals and cells, especially on chromosome 8.
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