Authors: Guiwu Xiong, Yong Wang
Addresses: School of International Business, Sichuan International Studies University, Lieshimu, Shapingba 400031, Chongqing, China; School of Economics and Business Administration, Chongqing University, Chongqing 400044, China. ' School of Economics and Business Administration, Chongqing University, Chongqing 400044, China
Abstract: This study investigates the optimal model of Job Integration of Multi-agent in Multimodal Transportations with Time Windows (JIMMTTW). The model is formulated firstly using the graph structure. The problem is NP-Hard. An optimal strategy including two layers is proposed after analysing the characteristics of the formulated model. At the first layer, a combination of shift move, swap move and loop move is adopted to effectively assign jobs to agents. At the second layer, a genetic algorithm based on Taguchi method is adopted to find the optimal route with multimodal transportations through K-shortest paths. A numerical example with different time windows is performed to validate the formulated model and the proposed algorithm. The results indicate that the integration of jobs can only be carried out among several jobs for the same agent due to the effect of time window, and the total cost will increase with the restraint increment of time window, which is similar to the practical application. The results also demonstrate that the proposed algorithm can effectively and efficiently solve the JIMMTTW.
Keywords: time windows; multi-agent systems; MAS; job integration; Taguchi methods; genetic algorithms; neighbourhood search; agent-based systems; multimodal transportation.
International Journal of Services, Economics and Management, 2010 Vol.2 No.3/4, pp.307 - 321
Available online: 01 Jun 2010 *Full-text access for editors Access for subscribers Purchase this article Comment on this article