• 제목/요약/키워드: Lee In-bok

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수직 접지전극의 정n각형배열의 합성 접지임피던스 (Combined ground impedance of equally-spaced n-vertical ground rods on circle)

  • 성창훈;이규선;김기복;김유하;이복희
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2011년도 제42회 하계학술대회
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    • pp.1572-1573
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    • 2011
  • 접지 저항을 줄이기 위해서 접지전극을 병렬로 시공할 경우 보다 쉽게 원하는 접지저항을 얻을 수 있다. 그러나 근접된 접지전극이 병렬로 매설되어 있을 경우 전위간섭의 영향으로 인해 합성 접지저항은 크게 감소하지 않는다. 현재의 전위간섭을 고려한 병렬접지전극의 합성 접지저항 및 합성 접지임피던스에 관한 연구는 많이 이루어지지 않았다. 본 논문에서 수직 접지전극을 정4각배열로 매설하였을 경우에 모의해석 방법을 제안하였으며 그 정확도를 평가하기 위해 실측값과 비교하였다.

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절삭공정의 적응제어에 관한 연구 (A Study on the Adaptive Control in Machining Process)

  • 송지복;이만형;이시복
    • 한국정밀공학회지
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    • 제2권3호
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    • pp.77-83
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    • 1985
  • Adaptive control technique for a milling process is developed and implemented in an NC milling machine retrofitted to enable the micro-computer control. The control algorithm has the objects to guarantee the optimal tool life which can give the predetemined allowable lower limit of surface roughness. The experimental results show 1) that the extended tool life equation has good reliability in normal tool wear conditions. 2) and that the proposed adaptive control technique, which determine the optimal cutting condition by basing on the tool life equation modified continually according to the tool wear measured in real time, performs well.

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Synthesis and hypoglycemic Activity of the Substituted Pyrrolidine Thiazolidinedione Derivatives

  • Kim, Bok-Young;Ahn, Joong-Bok;Lee, Hong-Woo;Shin, Jae-Soo;Moon, Kyoung-Sik;Kim, Joon-Kyum;Lee, Do-Young;Ahn, Soon-Kil;Hong, Chung-Il
    • 대한약학회:학술대회논문집
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    • 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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    • pp.342.3-343
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    • 2002
  • Non-insulin dependent diabetes mellitus (NIDDM) is characterized by hyperglycemia, hyperinsulinemia. and impaired insulin action. Insulin resistance is considered to be the underlying mechanism in the pathogenesis of type 2 diabetes. which also leads to dyslipidemia, hypertension. and obesity. Thazolidinediones are a class of oral insulin-sensitizing agents that improve glucose utilization without increasing insulin release. They significantly reduce glucose, lipid and insulin levels in rodent models of NIDDM and obesity, and recent clinical data support theri efficacy in obese diabetic patients. (omitted)

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수직접지전극의 임계길이 산정 (Computation of Critical Length for Vertical Grounding Electrode and Counterpoise)

  • 이복희;조정현;이봉;김종호;이승주;이강수;김기복;김태기
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2009년도 제40회 하계학술대회
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    • pp.1491_1492
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    • 2009
  • The impedance of a vertical grounding electrode is not lowered by expanding the dimension of the grounding electrode, and the length of thr vertical grounding electrode which shows the minimum value of the grounding impedance for each condition of frequency and soil characteristics is existent, and it is defined as Critical length. In this paper, the critical lengths for the vertical grounding electrodes are calculated by using the distributed parameter circuit model. The adequacy of the simulations has been confirmed by comparing the simulated results with the measured results.

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