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복수 화물터미널을 갖는 택배 서비스 네트워크 재설계를 위한 최적화/시뮬레이션 반복 기법
이희정(Hee Jeong Lee),고창성(Chang Seong Ko) 한국SCM학회 2010 한국SCM학회지 Vol.10 No.1
As express courier market expands rapidly, companies are exposed to fierce competition. To cope with struggle for their survival, the express courier companies are continuously making their every effort to improve their service system. Network design is usually constructed based on the initial investment and operating costs for terminals and service centers in express couriers. However, continuous reconfiguration for network design is required according as the service environment is rapidly changing. This study suggests a hybrid optimization/simulation approach to reconfiguring an express courier service network with respect to assignments of service centers to consolidation terminals, adjustments of their cutoff times and extensions of terminal capacities. With the hybrid procedure the ynamic nature of the express courier service network can be integrated into the optimization model. The optimal values of network reconfiguration parameters are found while complying with the desired performance level of the service network.
고창성(Chang Seong Ko),정기호(Ki Ho Chung) 한국SCM학회 2021 한국SCM학회지 Vol.21 No.2
Due to the increasing demand for parcel delivery, the amount of parcel delivery that couriers have to handle exceeds the current terminal capacity. To solve this problem, a new terminal will be built in addition to the existing terminal, or the terminal will be jointly used through alliances with competing courier companies. In this case, a hub terminal that can be used by courier companies is physically composed of several terminals. At this time, when a vehicle departing from a sub terminal arrives at the hub terminal, the decision to which terminal in the hub to allocate becomes a very important issue for parcel delivery companies for efficient terminal operation. In a situation where the capacity that can be handled per day in the hub terminal is limited, minimizing the travel distance of vehicles between terminals in the hub plays a decisive role in increasing the efficiency of hub terminal operation. This study presented a mathematical model for determining which terminal in the hub should be allocated to vehicles arriving at the hub from each sub terminal, and from which terminal the vehicle going to the destination sub terminal should be released. A solution method using Excel is presented and in order to find out the possibility of practical application, 12 example problems are solved, and the results are analyzed and presented.
고창성 ( Chang Seong Ko ),최은진 ( Eun Jin Choi ),이해경 ( Hae Kyeong Lee ) 한국로지스틱스학회 2006 로지스틱스연구 Vol.14 No.2
최근 e-commerce의 급속한 성장과 함께 택배서비스에 대한 수요가 급증하고 있으나, 이로 인한 택배업체의 난립에 따른 치열한 경쟁을 이겨내야 하는 택배업체들은 끊임없는 택배 프로세스의 개선 전략을 도모하고 있다. 택배서비스의 성공 여부는 화물의 집하, 분류 기능을 담당하고 있는 크로스도킹 택배 터미널의 성능에 좌우된다. 최근, 많은 업체들이 제품을 저장하기 위해 사용하던 창고 또는 물류센터들을 재고비용 절감과 신속한 고객 서비스 제공을 위해 크로스도킹 터미널 형태로 전환하고 있다. 크로스도킹터미널의 성능은 자동분류기를 활용함으로써 많이 향상되었지만 출고차량에 대한 상차 작업은 여전히 수작업으로 수행되기 때문에 여전히 터미널 작업에서의 애로공정으로 남아 있다. 본 연구에서는 터미널에서의 출고차량에 대한 상차 작업자 수의 최소화와 작업자 간의 작업 부하량 불균형율을 최소화하기 위하여 발송지점의 출차 도크 위치 결정을 하기 위한 방법론을 제시한다. 이를 위해 본 연구에서는 수리적 모형을 개발하고 이를 해결할 수 있는 유전 알고리듬과 라인밸런싱 휴리스틱을 제안한다. 마지막으로, 실험 문제테스트를 통해 제안 해법의 적용성 및 성능을 평가한다. There has been an increasing demand for direct shipment via express couriers over the last few years. The success of express courier services may largely be attributed to the performance of cross-docking consolidation terminal. Recently, many distribution centers are also converting to the cross-docking terminal which may provide better responsiveness by significantly reducing handling and storage of inventory. Although the performance of cross-docking terminals has been improved by utilizing automated sorting conveyor, loading into the outgoing trucks still remains a bottleneck process. This study presents an approach for assigning destinations to shipping dock doors in order to minimize both the number of workers engaged in loading operation and the imbalance ratio among the workers. For this purpose, a mathematical model is developed and a genetic algorithm procedure is suggested to solve it with a line balancing heuristic. The applicability and validity of the solution heuristic are demonstrated through experimental problems.