• Title/Summary/Keyword: Chung-Sang

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Comparison of High-Speed Slotless Brushless Machines with Permanent Magnet Array Rotor (회전자의 영구자석 배열에 따른 초고속 슬롯리스 브러시리스 기기의 특성 비교)

  • Jang, Seok-Myeong;Jeong, Sang-Sub;Ryu, Dong-Wan;Cha, Snag-Do;Choi, Sang-Kyu
    • Proceedings of the KIEE Conference
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    • 2000.07b
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    • pp.650-652
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    • 2000

  • Proposed slotless PM machine is constructed without stator winding slots. Its stator magnetic material is in the form of a ring and winding have a toroidal configuration and its rotor consists of a 4-pole Halbach array or radially magnetized PM rotor. Thus, airgap flux density distribution and induced emf waveform are essentially sinusoidal. Open circuit magnetic fields and developed torque of each type are presented from the analytical method and finite element method.

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Statistical analysis of the employment future for Korea

  • Lee, SangHyuk;Park, Sang-Gue;Lee, Chan Kyu;Lim, Yaeji
    • Communications for Statistical Applications and Methods
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    • v.27 no.4
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    • pp.459-468
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    • 2020

  • We examine the rate of substitution of jobs by artificial intelligence using a score called the "weighted ability rate of substitution (WARS)." WARS is a indicator that represents each job's potential for substitution by automation and digitalization. Since the conventional WARS is sensitive to the particular responses from the employees, we consider a robust version of the indicator. In this paper, we propose the individualized WARS, which is a modification of the conventional WARS, and compute robust averages and confidence intervals for inference. In addition, we use the clustering method to statistically classify jobs according to the proposed individualized WARS. The proposed method is applied to Korean job data, and proposed WARS are computed for five future years. Also, we observe that 747 jobs are well-clustered according to the substitution levels.

  • https://doi.org/10.29220/CSAM.2020.27.4.459 인용 PDF KSCI

Phytosterols and Lignans from the Sesame Dregs of Sesamum indicum

  • Kim, Hye-Min;Lee, Jeong-Min;Park, Jun-Yeon;Lee, Sul-Lim;Han, Saem;Kim, Hyun-Young;Son, Dong-Wook;Choi, Sang-Yoon;Lee, Sang-Hyun P.
    • Korean Journal of Plant Resources
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    • v.21 no.6
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    • pp.420-426
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    • 2008

  • Phytochemical investigation of the sesame dregs of Sesamum indicum was conducted by open column and prep-HPLC chromatography. Two phytosterols (1 and 2) and two lignans (3 and 4) were isolated from the MeOH extracts of sesame dregs, and identified as ${\beta}$-sitosterol (1), daucosterol (2), sesamin (3), and sesamolin (4) by spectral analysis. Although these compounds were already isolated from sesame, it is important that they were still main phytochemical components in the sesame dregs.

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