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동해안 지역 재생에너지원 접속에 따른 과도안정도 여유 분석 및 발전제약 산정 연구
신정훈,정인주,오승찬,송지영,구현근,배문성,곽은섭,민재현 대한전기학회 2022 전기학회논문지 Vol.71 No.11
Increasing renewable energy resources can lead to critical stability problems in power systems. Specially in Korean power system, since the power generation complex is concentrated on the coast, there are constraints on transmitting to the load. If a connection of renewable energy resources near generator buses continues to grow, specially in the east cost, transient stability problems may arise due to shortage of transmission lines. Therefore, it is necessary to evaluate how much renewable energy access at each site can affect the power system by some stability index such as critical clearing time. This paper shows how to assess or calculate the margin of dynamic stability and verify the methodology through assessment of a practical power system. Based on the methodology, this paper analyzes the practical system and draws conclusions.
컨테이너터미널 트랜스퍼 크레인의 배정 및 이동경로 최적화 모델
신정훈,유성진,장명희 한국항해항만학회 2008 한국항해항만학회지 Vol.32 No.6
As the excessive competition between container terminals has been deepening, not only productivity, but also cost economic of the terminals has been raised. With regard to this, the competitiveness of the terminals is limited because of inefficiency operation of transfer crane(T/C) which needs large amount of energy consumption. Therefore, it is possible that the improvement in the T/C operation leads to saving cost for resources and energy as well as increasing the productivity of the terminals. This study provides ‘the K-Means Clustering based Optimized Decision Model for Transfer Crane Operation', referring to ‘RFID & RTLS based Port Logistics Initiative’ of Ministry of Land, Transportation and Maritime Affairs and estimates the efficiency through simulating. 최근 컨테이너터미널 간의 경쟁이 심화되면서 생산성 측면뿐 만 아니라 비용경제성 측면에도 관심이 부각되고 있다. 특히, 에너지 소모량 및 장비투입 규모가 큰 트랜스퍼 크레인 부문에 대한 비효율적인 작업요소가 컨테이너터미널 경쟁력 제고에 있어서 걸림돌이 되고 있으며 이에 대한 개선은 인적, 물적 운영비용의 절감과 함께 생산성의 향상에도 긍정적인 영향을 미칠 것으로 기대된다. 따라서 본 연구에서는 현재 국토해양부 주관으로 진행 중인 ‘RFID를 활용한 RTLS 기반 항만물류효율화 사업’을 통하여 제공 가능한 컨테이너터미널 반ㆍ출입 대상 컨테이너의 시간적 가시성을 토대로 트랜스퍼 크레인의 배정 및 이동경로에 대한 클러스터링 기반 최적화모델을 제안하고 시뮬레이션 기법을 통하여 기대효과수준을 확인하였다.
高句麗 廣開土王代의 稗麗 征討와 後燕과의 冊封이 가진 의미
신정훈 중앙대학교 중앙사학연구소 2013 중앙사론 Vol.0 No.37
In 395 A.D., King Gwanggaeto of Goguryo conquered Paeryo in the area of Siramuren river. In that time, Later-Yan gone into war with Northern Wei. Northern Wei invaded territory of Later-Yan in march of 395 A.D. Northern Wei defeated utterly Later-Yan in Chamhabpa of Eastern Mongolia. In 385 A.D., Goguryo had a war with Later-Yan for taking Yodong.. After the war between Goguryo and Later-Yan, both countries became potential enemies for each other. Later-Yan had a battle with Northern Wei In 395 A.D. At that time, King Gwanggaeto conquered Paeryo without check of Later-Yan. Goguryo obtained flocks of sheep, horses and cattle. These material resources were used attack on Baekje. After conquest of Paeryo, King Gwanggaeto of Goguryo made a round of Yodong for hunting. In that time, Yodong was territory of Later-Yan. Later-Yan raise an large scale army against Northern Wei. In the face of these situations, the Goguryo forces could understand topograpies and planimetric feat1ures of Yodong area. Meanwhile, this theses takes note of relationship between Goguryo and Later-Yan. Goguryo employed a foreign policy in which it maintained the installation relationship with Later-Yan in 396 A.D.. At this time, Later-Yan was consistently attacked by Northern Wei. In this situation, if Goguryo had invaded in Later-Yan, Later-Yan had to raise the tomahawk with Goguryo and Northern Wei. On this reason, Later-Yan used installation relationship as a safety device. On one hand, Goguryo accepted installation relationship. Why did accept Goguryo installation relationship from Later-Yan? Because Goguryo was admitted the dominium in the region of Pyeongju, Yodong and Daebang by Later-Yan. Also, It had relevance to a relation with Baekje. Goguryo captured 58 castles and 700 country of Baekje in 396 A.D. In this situation, Goguryo could concentrated on attacking Baekje without unawaring of Later-Yan.