• Title/Summary/Keyword: Chang-Ki(張機)

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Ki-Won Chang, The first specialist on the history of Korean mathematics (최초의 한국수학사 전문가 장기원(張起元))

  • Lee, Sang-Gu;Lee, Jae-Hwa
    • Communications of Mathematical Education
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    • v.26 no.1
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    • pp.1-13
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    • 2012

  • Ki-Won Chang(1903-1966) is considered as the first mathematician who made a contribution to the study of the history of Korean mathematics. In this paper, we introduce contributions of Ki-Won Chang, his discovery of old Korean literatures on mathematics, and his academic contribution on the history of Korean mathematics. Then we analyze and compare his conclusions on old Korean mathematics with recent works of others. This work shows some interesting discovery.

  • https://doi.org/10.7468/jksmee.2012.26.1.001 인용 PDF KSCI

Temperature rise calculation of a disc type motor with heat source method (열회로 방식에 의한 Disc type motor의 온도상승 계산)

  • Park, Chang-Soon;Chang, Ki-Chan
    • Proceedings of the KIEE Conference
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    • 1991.07a
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    • pp.43-46
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    • 1991

  • Nd-Fe-B Permanent Magnet, which is recently more used, has some advantages in comparison with other permanent magnet. However, for the Nd-Fe-B has higher RTC(reversible temperature coefficient), property of the Nd-Fe-B magnet is changed by temperature rise. In this paper temperature rise of a disc type motor is calculated using a heat source network method.

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