• Title/Summary/Keyword: E-J characteristic

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Operating Characteristic of a User Defined Distance Relay Model in PSS/E during Voltage Instability (전압 불안정시 PSS/E 사용자 정의모델로 구현된 거리계전기 응동 특성)

  • Lee, D.G.;Kang, S.H.;Yang, J.J.;Oh, H.W.;Jang, B.T.
    • Proceedings of the KIEE Conference
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    • 2003.11a
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    • pp.82-84
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    • 2003

  • This paper presented a method to develop a relay model by the user-written model function of PSS/E. As for the voltage instability, although generator current limiters, transformer's tap-changers and dynamic loads have been considered as the dominant components, the protection system is also very important because it may influence the system's dynamic behaviour. Hence a distance relay model implemented with the suggested method was added, and then the operating characteristics of the distance relay under the voltage instability condition were investigated.

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Characteristic of Additional Lateral Force Induced by Freight Car Loading CWR When Passing over Turnout and Curves (장대레일 화차의 분기부 및 곡선구간 통과시 추가횡압 발생에 관한 연구)

  • Kim, E.;Yang, S.C.;Lee, J.H.;Lee, J.D.
    • Proceedings of the KSR Conference
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    • 2002.05a
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    • pp.242-249
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    • 2002

  • This research suggests the assessment method of the additional lateral force caused bending moment of CWR when a freight car loading it is passing over turnout system or curves. The characteristics of lateral lone are analyzed by calculating the lateral pressure acting on the rails of conventional railway.

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A PROOF OF STIRLING'S FORMULA

  • Park, June-Sang
    • Communications of the Korean Mathematical Society
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    • v.9 no.4
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    • pp.853-855
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    • 1994

  • The object of present note is to give a very short proof of Stirling's formula which uses only a formula for the generalized zeta function. There are several proofs for this formula. For example, Dr. E. J. Routh gave an elementary proof using Wallis' theorem in lectures at Cambridge ([5, pp.66-68]). We can find another proof which used the Maclaurin summation formula ([5, pp.116-120]). In [1], they used the Central Limit Theorem or the inversion theorem for characteristic functions. In [2], pp. Diaconis and D. Freeman provided another proof similarly as in [1]. J. M. Patin [7] used the Lebesgue dominated convergence theorem.

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