• Title/Summary/Keyword: Yoon-Sang

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Heuristic rule-based coordination of Distance Relaying in Transmission System (경험적 룰에 의한 송전계통의 거리계전 방식 협조)

  • Lee, Seung-Jae;Lee, Byeong-Chil;Yoon, Sang-Hyun;Yoon, Man-Chul;Lee, Sang-Ok
    • Proceedings of the KIEE Conference
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    • 1990.07a
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    • pp.121-124
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    • 1990
  • Distance relaying is one of the most commonly used protection schemes in the high voltage transmission systems. In this scheme, coordination between the primary and backup relays is very critical for the power system security. This paper reports an rule-based methodology for checking and correction of miscoordination problems in the distance relaying. Diagnosis rules achieving an accurate but simple checking have been developed through the geometric analysis of the impedance characteristics of the distance relays. Heuristic rules having the pratical power for miscoordination correction are suggested. The proposed method has proved very effective through the several case studies on the actual systems.

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DISCO: A COMPUTER PROGRAM FOR PROTECTION COORDINATION OF DISTRIBUTION SYSTEMS (DISCO: 배전 계통 보호 기기 정정 프로그램)

  • Lee, Seung-Jae;Park, Young-Moon;Lee, Jeoung-Won;Yoon, Sang-Hyun;Yoon, Man-Chul;Lee, Sang-Ok
    • Proceedings of the KIEE Conference
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    • 1990.07a
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    • pp.125-128
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    • 1990
  • A program for the protection coordination of distribution systems is reported. The developed program nailed DISCO, consisting of two modules has a capability of selling the overcurrent relays, reclosers, sectionalizers, fuses which are commonly used in the primary feeder systems. Setting is performed in a downstream fashion starting from the substation, and coordination rules are applied identifying the pattern of the primary-backup devices based on the depth-first search. T/C curves of various devices are handled by digitization for accuracy and various graphics and windows are adopted for user-friendly interface.

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A study on the Yoon Gil-Young's theory of classification in the "syndrome differentiation" (윤길영(尹吉榮)의 병증(病證) 대분류에 대한 고찰)

  • Kim, Gyeong Cheol;Lee, Jeong Won
    • The Journal of the Society of Korean Medicine Diagnostics
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    • v.19 no.1
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    • pp.55-63
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    • 2015
  • Objectives In order to the review of the Yoon Gil-Young's theory on the "differentiation of syndromes", we studied on the his method and system of classification on the "differentiation of syndromes". Methods We reviewed on "The Clinical Formula Science Traditional Korean Medicine 東醫臨床方劑學", "A study on the Methodology of Traditional Korean Medicine 東醫學의 方法論硏究" "The theory of SaSang Constitution Medicine 四象體質醫學論". From a connected standpoint with the basic theory and clinical medicine, considered on the Yoon Gil-Young's theory of "differentiation of syndromes". Results Yoon Gil-Young's theory of differentiation of syndromes and treatment was widespread so much that he studied on the learning field of Traditional Korean Mediciine and ingenious as well. The main principles of differentiation of syndromes was summarized the three representative syndrome-complexes; BON-HER(original deficiency syndrome), BON-HAN(orginal cold excess syndrome), BON-YEOL(original heat excess syndrome). And also the three representative syndrome-complexes was previously carried out the details of differentiation of syndromes and assigned represent prescription one by one. Conclusions As the results, Yoon Gil-Young insisted the system of differentiation of syndromes closely connecting with Traditional Korean Medical physiology, pathology, diagnosis and prescriptions. And therefore he was a frontier of the field of Traditional Korean Medicine.

RFID Mutual Authentication Protocol with Security and Performance Improvements (안전성과 성능을 개선한 RFID 상호인증 프로토콜)

  • Hong, Sung-Hyuk;Park, Jong-Hyuk;Yeo, Sang-Soo;Ha, Kyung-Jae
    • Journal of Advanced Navigation Technology
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    • v.13 no.6
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    • pp.876-883
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    • 2009
  • In 2008, Kim-Jun proposed RFID Mutual Authentication Protocol based on One-Time Random Numbers which are strong in Eavesdropping Attack, Spoofing attack and Replay attack. However, In 2009, Yoon-Yoo proved that it was weak in Replay attack and proposed a protocol which can prevent Replay attack. But Yoon-Yoo's protocol has problems that efficiency on communication and Brute-force attack. This paper shows weak points of Yoon-Yoo's protocol and proposes an RFID mutual authentication protocol with security and performance improvements.

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