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A Model for the Mechanism of Container Ports' Cooperation Networks in Northeast Asia
고용기,임종섭,이희용 한국무역학회 2007 Journal of Korea trade Vol.11 No.2
This paper is aimed at developing a relevant mathematical model for the mechanism of cooperation networks between container ports in Northeast Asia. The model may be utilized to identify more effective development for cooperation networks between container ports in specific regions and to evaluate the cooperation network system. The procedure enables determination of the optimal capacities and time of container port development as well as the optimal container cargo flow through en route between major ports in the region. A new algorithm was developed for the purpose of evaluating effective development plans. Dynamic and linear programming methods are applied to each of the two planning problems: the former for the optimum container port capacity development problem and the latter for the optimal allocation of container traffic movement.
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기상재해 대비 간척지 논 범용화를 위한 저비용 고효율 암거 품질 성능 평가
고용기,이재영,김태희,차상선,김현태,박영준,박찬기 경상대학교 농업생명과학연구원 2021 농업생명과학연구 Vol.55 No.6
본 연구는 플라스틱 재료를 사용한 유공관 암거의 품질성능시험을 통해 간척지 농지 범용화에 적용가능 여부를 판단하였다. 직경 30mm, 50mm, 55mm의 폴리에틸렌 재질의 유공관을 사용하였으며, 품질성능평가 항목은 밀도시험, 인장강도시험, 충격강도시험, 투수시험을 실시하였다. 밀도시험결과는 모든 시험편에서 유공관 품질기준인 밀도 0.94g/㎤이상의 결과를 보였으며, 인장강도 시험은 직경 30mm와 직경 55mm는 24.5MPa이상으로 품질기준을 만족하지만, 직경 50mm 유공관에서 24.4MPa로 품질기준인 24.5MPa에 미흡하므로 보강이 필요한 것으로 나타났다. 충격강도시험은 모든 시험편에서 파괴도 5미만으로 품질기준을 만족하는 결과를 보였으며, 내면에도 이상이 없는 것으로 분석되었다. 투수시험 결과는 모든 시험편에서 품질기준인 0.1㎝/sec 이하를 만족하는 결과를 보였다. 본 연구에 적용한 주름유공관은 간척지 범용농지 에 지하배수암거로 사용이 가능한 것으로 평가되었다. 하지만 제품의 공장생산 시 품질관리가 미흡할 소지가 있으므로 현장반입 전 사전품질 관리가 필요하다고 판단된다. In this study, the quality performance of the perforated pipe culvert material was evaluated as a material for generalization of reclaimed land farmland through the performance experiment of perforated pipe culvert using plastic material. The perforated tubes of polyethylene materials with a diameter of 30mm, 50mm, and 55mm were used. The quality performance evaluation items were conducted in density test, tensile strength test, impact strength test, permeability test. As a result, all test pieces showed results of 0.94g/㎤ or more, which is the quality standard for perforation tubes. In the tensile strength test, the quality standard was 24.4 MPa in a perforated tube with a diameter of 50mm, which was less than the quality standard of 24.5MPa, but 25.25MPa in a diameter of 30mm and 25.73MPa in a diameter of 55mm, which satisfied the quality standard. In the impact strength test, all test pieces showed satisfying results in quality standards with less than 5 destruction, and it was analyzed that there was no abnormality in the inner surface. The results of the pitching test showed that all test pieces met the quality standard of 0.1cm/sec or less. The results of discharge capacity test differed from the theoretical calculation results using the Manning formula, but these results were judged to have resulted in a loss at the joint between the tank and the perforated pipe, and the reason for the difference was assumed to be a full water channel at the time of formula calculation. The results of the quality test of the perforated pipe culverts are expected to be used in the reclamation land general purpose.
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해외물류거점확보를 통한 국제물류시스템 구축방안에 관한 연구 : 동북아지역권의 항만인프라시설을 중심으로 With reference to Northeast Asian Ports
고용기,김승철 한국유통정보학회 2001 유통경영학회지 Vol.4 No.1
This study is to develop intra regional international logistics strategies between ports and its annex industrial complex in Northeast. It begins with a description of the needs of and prospects for trade between Korea, Japan, China, and North Korea following explanation of the current economic status of these countries as well as trade and investment trends in the region. The following viewpoints are suggested for intra regional development strategies based on the current circumstances. First cooperation strategies and economic investment for promoting the mutual concerns and interests of these countries were developed. Second, a practical way of utilising the port development plans was devised to stimulate industrial and investment cooperation. Third, a method of building a network among major ports in Northeast was developed. Fourth, and international logistics system that makes connection between sea, land and air easier through logistics standardisation was suggested in preparation for the changing environment of logistics and production control. Finally, methods of improving neighboring feeder port facilities are suggested.
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