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Quadratic 복수 컨테이너 적재 문제에 관한 연구
여기태(Gi-Tae Yeo),석상문(Sang-Moon Soak),이상욱(Sang-Wook Lee) 한국경영과학회 2009 韓國經營科學會誌 Vol.34 No.3
The container packing problem is one of the traditional optimization problems, which is very related to the knapsack problem and the bin packing problem. In this paper, we deal with the quadratic multiple container packing problem (QMCPP) and it is known as a NP-hard problem. Thus, it seems to be natural to use a heuristic approach such as evolutionary algorithms for solving the QMCPP. Until now, only a few researchers have studied on this problem and some evolutionary algorithms have been proposed. This paper introduces a new efficient evolutionary algorithm for the QMCPP. The proposed algorithm is devised by improving the original network random key method, which is employed as an encoding method in evolutionary algorithms. And we also propose local search algorithms and incorporate them with the proposed evolutionary algorithm. Finally we compare the proposed algorithm with the previous algorithms and show the proposed algorithm finds the new best results in most of the benchmark instances.
여기태(Gi-Tae Yeo) 한국항만경제학회 2009 韓國港灣經濟學會誌 Vol.25 No.2
본 연구는 AHP(Analytic Hierarchy Process)법을 이용하여 우리나라 물류시스템를 구성하는 분석요소인 ‘내부 구성요소’와 ‘외부 요구항목’을 추출하고, 이들 요소의 가중치 및 우선순위 제시하여 우리나라 물류시스템 효율화에 시급한 개선점 제시를 연구의 목적으로 하였다. 연구의 결과, ‘내부 구성요소’는 도로, 철도, 해운, 항공, 파이프라인의 총 5가지 요소로 구성됨을 확인하였다. AHP법을 이용한 분석결과, 설문에 응답한 전문가들은 도로(0.312)를 가장 중요한 내부 구성요소로 판단하고 있으며, 해운(0.269)을 2순위, 철도(0.239)을 3순위, 항공(0.118)을 4순위, 파이프라인(0.063)을 5순위로 중요하게 고려하고 있었다. 한편, 물류시스템 ‘외부 요구항목’은 기반시설, 운영효율성, 정보시스템, 인적자원, 비즈니스환경, 정치적환경, 연계성 등 총 7가지 요소로 구성됨을 확인하였다. ‘외부 요구항목에 대하여 AHP법을 적용한 결과 설문에 응답한 전문가들은 요구항목 중 기반시설(0.322)을 1순위, 운영효율성(0.206)을 2순위, 정보시스템(0.151)을 3순위, 인적자원(0.121)을 4순위, 비즈니스환경(0.075)을 5순위, 연계성(0.073)을 6순위, 정치적환경(0.052)을 가장 낮은 순위로 판단함을 알 수 있었다. The aim of this paper is to evaluate weight and priority values for 'inner consisted factors' and 'outer requested factors' of logistics system using the AHP(Analytic Hierarchicy Process) method. As for analysis regarding inner consisted factors, the results were shown as follows: a road transportation (0.312) as first rank; a marine transportation (0.269) as second rank; a railway transportation (0.239) as third rank; an air transportation (0.118) as fourth rank, and a pipeline transportation (0.063) as fifth rank. In terms of analysis regarding outer requested factors, the results were came out as follows: an infrastructure (0.322) as first rank; a performance (0.206) as second rank; an information system (0.151) as third rank; a human resources (0.121) as fourth rank, a business environment (0.075) as fifth rank; a connectivity (0.073) as sixth rank, and a political environment (0.052) as seventh rank.
국내 해상관광 항로활성화를 위한 효율성 분석에 관한 연구
여기태(Gi tae Yeo),조건식(Geon sik Jo),이진규(Jin kyu Lee),왕영(Ying Wang) 한국국제상학회 2014 國際商學 Vol.29 No.4
본 연구는 자료포락분석(DEA)방법 중 투입중심 CCR 모형과 BCC 모형 및 Malmquist 지수 모형을 활용하여 국내 12개 해상관광항로의 효율성을 분석하는 것을 목적으로 하였다. 국내 12개 해상관광항로는 2012년 관광객 수송실적 341,422명, 운항거리 33.55해상마일을 평균적으로 기록하였다. 효율성 분석을 위해 속력, 총톤수, 운항거리를 투입변수로, 여객수송 실적을 산출변수로 선정하였다. 분석 결과, 2007년~2012년까지 모슬포-마라도 항로가 CCR, BCC, 규모 효율성 모두 1로 나타났다. 동기간 정적 BCG 분석에서도 모슬포-마라도항로는 "Star"군에 위치하고 있는 것으로 나타났다. 향후 관광항로의 활성화를 위해서는 공적지원확장, 선박금융제도 지원 등 정부의 적극적인 지원정책과 이용자의 요구가 반영된 관광 상품 개발 등을 통한 운영 효율성 향상이 필요하다. Purpose : This paper aims to analyze the relative efficiency within the Korean Tourism Sea Routes(KTSRs), to select the relatively low effective Decision Making Units(DMUs), and to suggest the activation strategies for those. Research design, data, methodology : As a research methodology, input oriented CCR and BCC models of Data Envelopment Analysis(DEA) and Malmquist Index Model were applied to 12 KTSRs. To draw out the efficiency of targeted KTSRs, 'ships' speed', 'total tonnage' and 'operation distance' are used as input variables while the 'total number of tourists' is represented as output variables. Results : As a result, Moseolpo-Marado is the most efficient sea route which is scored CCR and BCC 1. Conclusions : For an activation of tourism routes in the near future, government's policies such as public supports, and ship's financial assistance are urgently needed. In addition, the enhancement of operational efficiency is required through the development of tourism contents based on customers' needs.
전라북도 지역발전을 위한 물류진단시스템구축 및 개선방안 제시에 관한 연구
여기태(Gi-Tae Yeo),박준배(June-Bae Park) 한국항만경제학회 2006 韓國港灣經濟學會誌 Vol.22 No.1
The aim of this paper is to establish the evaluation system of improving urban logistics using the QFD(Quality Function Deployment) model which can facilitate to grasp the improving degree of realizing the system conforming to the relationship of all process and the process improvement. At the first stage, the established system through the QFD method will be used to evaluate and diagnosis the level of urban logistics in Cheonbuk District. The second stage is to investigate the important components that can make prompt improvement of urban logistics. Then, the sensitivity analysis is to be performed and the degree of improving urban logistics will be presented according to the rising degree of the relevant components.
인천항만의 물류수준 평가 및 개선방안 도출에 관한 연구
여기태(Yeo, Gi Tae) 인하대학교 정석물류통상연구원 2008 인하대학교 정석물류통상연구원 연구총서 Vol.- No.-
The aim of this paper is to establish the evaluation system of improving port logistics using the QFD(Quality Function Deployment) model which can facilitate to grasp the improving degree of realizing the system conforming to the relationship of all process and the process improvement. The research methodology is consisted of four phases. The first step is to investigate the important factors consisting the port logistics of Incheon and then calculate the weighting of factors by Analytic Hierarchy Process (AHP). The second step is to draw out the degree of inter-relation among factors by Fuzzy Subordination Relations (FSR). At the third step, the established system through the QFD method using results of the first and second steps will be used to evaluate and diagnosis the level of port logistics in Incheon. Finally, the sensitivity analysis is to be performed and the degree of improving port logistics will be presented according to the rising degree of the relevant factors. As a result, overall system level of Port of Incheon will be 54.33% for year 2007, 68.99% for year 2015, and 77.35% for year 2020. The critical factors increasing the system level largely from requested factors are port service, logistics cost and convenience while port logistics information system, storage and cargo handling system, and hinterland connecting system from consisted factors.
여기태(Gi Tae Yeo),박성일(Sung Il Park),정현재(Hyun Jae Jung),전준우(Jun Woo Jeon) 한국물류학회 2013 물류학회지 Vol.23 No.1
전국에서 약 20%의 비중을 차지하고 있는 인천의 원목산업은 인천지역에서 상당히 중요한 산업으로 위치하고 있다. 이러한 화물의 중요성으로 인하여 인천항은 원목관련 화물을 전용으로 취급하는 부두를 인천항 북항에 개발하는 계획을 추진하였다. 하지만 최근 급변하는 무역환경과 다양한 환경변수에 따라 인천항의 원목 물동량이 점차 감소하는 추세를 보이고 있다. 이러한 측면에서 인천항 원목에 대한 정확한 수요예측이 시급한 실정이다. 본 연구는 경제성장률, 벌크운임지수, 환율과 같은 경제 요인과 부동산 경기, 허가면적, 건설수주와 같은 부동산 요인을 영항변수로 선정하고 이들을 고려하여 인전항의 원목 수출입 물동량을 예측하였다. 분석결과, 국내 원목 생산량은 2015년까지 꾸준히 증가하는 반면에 국외원목 수입량은 지속적으로 감소할 것으로 나타났으며 민감도 분석결과, 국내외원목 수급량 모두 부동산요인보다는 경제요인에 보다 민감하게 반응하는 것으로 나타났다. The log business of Incheon which accounts for about 20% in country became significantly important business in Incheon. Due to importance of these cargoes, Incheon port carried forward plans to develop docks which can handle log cargoes exclusively to the north port. However, recent log cargoes in Incheon port is decreasing steadily. So Incheon port needs accurate demand forecasting about log cargoes now in order to promote the log business. Thus, this study took into account economy factors such as GDP, BDI and the exchange rate and property factors such as real estate economy, permit area and construction as the important factor. Also by considering these factors, this study forecasted log cargoes in Incheon port. The result of analysis shows that domestic log cargoes increase to 2015 steadily but external log cargoes decrease to 2015 continuously. Also, the result of sensitive analysis shows that domestic and external log cargoes respond to economy factors more sensitively than property factors.
퍼지이론을 도입한 동북아 항만물류 거점간 경쟁 및 협력현상의 구조분석에 관한 연구
여기태(Yeo, Gi-tae) 한국물류학회 2007 물류학회지 Vol.17 No.2
최근 동북아시아에서 일어나고 있는 폭발적인 물류증가세는 동 지역 내 항만물류 거점간 경쟁 및 협력현상을 유발하고 있다. 특히, 중국항만의 확장 및 신흥항만의 급성장에 대비하기 위하여 한국 및 일본의 항만은 다양한 전략마련에 부심 하고 있다. 이러한 측면에서 본 연구는 경쟁 및 협력현상을 중심으로 동북아시아 항만을 체계적으로 분류하기 위하여, FCM (Fuzzy C-Mean)법을 사용하여 분석을 수행하였다. 그 결과 대상지역 21개 주요 항만은 총 5개의 독자적인 위상을 갖는 항만군으로 분류됨을 확인하였다. 가장 경쟁에서 우위를 점하는 항만은 A 군집에 속하는 홍콩항만이 차지하였으며 이를 근접한 위치에서 추격하는 항만군은 부산, 상하이, 선전 항만이 속한 B 군집으로 확인되었다. 또한,A와 B군 집에 이어 경쟁력을 갖춘 것으로 판단되는 중간그룹은 칭다오, 닝보, 텐진항이 포함되는 C군집으로 나타났다. 한편, 기장 하위에 위치하는 D군집(요코하마, 다렌, 고베, 나고야)과 E군집(타이충, 인천, 푸저우)은 협력항 전략과 직기항유도 전략이 필요한 군집으로 분석되었다. 한편, 기존 연구결과에 비교를 통하여, 시계열변화에 따른 동북아시아지역 항만의 위상변화를 제시하였다. The aim of this research is to classify the 21 container ports in Northeast Asia regioin using components of competition and co-operation under the well-known methodology" FCM(Fuzzy C-Mean). Through this approach, those 21 ports were classified into five port groups, and also membership degree of each port within the five port groups were suggested. As results, Honk Kong which positioned Group A, was turned out the most competitive independent port. The next competitive group was found out as Group B which consisted of port of Busan, Shanghai and Shenzen. The Group C, which located in the middle level in terms of competitiveness and seemed to have potential to compete to Group A and B, included the three ports i.e., Qingdao, Ningbo and Tianjin. Finally, the lowest competitive port groups in the targeted area were shown as Group D (Yokohama, Dalian, Kobe, Nagoya, Osaka) and Group E (Taichung, Inchon, Fuzhou), which have five and three ports respectively, were needed to search the co-operation strategies.
부산항의 재개발 대상지 선정 및 재개발 방향설정에 관한 연구
여기태 ( Yeo Gi Tae ) 한국경제지리학회 2003 한국경제지리학회지 Vol.6 No.2
Busan Port, Korea, is a region that must take integrated measures against problems such as the excessive handling of cargo volume, the intensification of port congestion, and the construction of a new port to improve port competitive power. In particular, if a great deal of function in the existing area of Busan Port transfers to a new port, then the problems of port redevelopment will occur as shown in the cases of port developed countries explained hereafter. For Korean ports, port redevelopment in a port zone is implemented for improving the port productivity that targets a local area, but the entire and systematic port redevelopment is not accounted for. Focused on this point, the paper is to present the directions for full-scale port redevelopment of the existing zone of Busan Port. The findings are as follows: First, the region of Busan is divided according to a regional classification that is necessary for port redevelopment. Thereby, 4 zones, total 26 regions of redevelopment were selected. Second, overseas case studies were considered for port redevelopment. From these same studies, appropriate types of port development in Korea were extracted and presented. Third, the status and problems of the selected redevelopment regions were analyzed, and types of port redevelopment were assigned. This study was not applied to the strict evaluation technique by quantitative analysis, but the concept and directions for unprecedented port redevelopment were first defined and established. It is significant to select target areas for redevelopment by regional classification and present directions for developing each region by choosing Busan Port as a real case study. This initiation will greatly contribute to the succeeding study.