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Competitive Analysis for the On-line Truck Transportation Problem

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Abstract

In this paper, the on-line k-truck transportation problem (k-OLTTP) whose objects are to be transported between the vertices of a given graph on which there are k mobile trucks to be scheduled is proposed. It is motivated by the research concerning on-line k-truck problem and on-line transportation problem. The goal is to minimize the makespan which is consumed to complete some on-line request sequence. Some preliminary knowledge is introduced and the model of k-OLTTP is established firstly. Two versions of a special case of k-OLTTP, namely 1-OLTTP, have been studied and some results are obtained. For the first version, Open-1-OLTTP, a lower bound of competitive ratio 2 is presented and two optimal on-line algorithms, Reschedule Strategy (RS) and Lay Over Strategy (LOS) respectively, are analyzed. For the second version, Close-1-OLTTP, a lower bound of competitive ratio \({1 \over 2} + {1 \over 2} \cdot \sqrt{1 + {4\over\theta}}\), where θ is the ratio between the time consumed by the loaded truck and the empty truck to travel the same distance, is also developed and on-line algorithms RS and LOS are proved to have competitive ratio 2. Finally, some interesting remarks concerning OLTTP and its future research are discussed.

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Correspondence to James N. K. Liu.

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Ma, W., Liu, J.N.K., Chen, G. et al. Competitive Analysis for the On-line Truck Transportation Problem. J Glob Optim 34, 489–502 (2006). https://doi.org/10.1007/s10898-005-2849-1

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