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M. Arata,N. Takahashi,M. Fujita,M.Mochizuki,T.Araki,T.Hanai 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
According to electrical output up rating of a permanent magnet motor and request to operate for a large variable speed range, resonance between structural natural vibration and electromagnetic force inside the motor can take place and make noise. This paper describes the mechanism of a resonance between them and noise lowering procedure by frequency shift when they are applied to the reluctance torque largely employed new motor named Permanent magnet Reluctance Motor (PRM).
Choi, M.Y.,Mochizuki, A.,Henry, C.S. 한국응용곤충학회 2015 Journal of Asia-Pacific Entomology Vol.18 No.2
Chrysoperla nipponensis s. lat. were collected as eggs or adults at five sites in Korea, and larvae were purchased from a Korean insectary (Osang-Kinsect Co.). A minimum of five complete courtship songs (= shortest repeated units or SRUs, the phrase exchanged between partners while duetting) of each specimen of C. nipponensis s. lat. were digitally recorded and the mitochondrial cytochrome oxidase I (COI) gene was analyzed, confirming that both cryptic species, types A and B, live in Korea. Within a population of C. nipponensis s. lat. sold by a commercial insectary in Korea, individuals whose larval head markings are type A, but whose mitochondrial sequence is type B were found. We also demonstrated that although most individuals derived from the commercial insectary had type A songs, several produced songs exhibiting key elements from type B, suggesting that mixture of the two species at the time the colony was established, or possibly later.