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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Initialization for optimization of real world vehicle routing problem
 Volf, Robin ; Klhůfek, Jan (referee) ; Sedlák, David (advisor)
The goal of this work is to optimize the initialization phase in solving the rich vehicle routing problem on a specific dataset which comes from a czech logistics company's data. This dataset has characteristics of VRPTW, VRPSPD and HFVRP. A modified cheapest insertion heuristic was chosen for the solution. Cost calculation consists of six partial costs which reflect individual constraints. Proposed heuristic is able to solve the instances in a matter of few seconds. Construction heuristic which generates valid solutions in short time enables more effective optimization in latter parts of solution.
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Vehicle routing problem with heterogeneous fleet
 Künzelová, Barbora ; Pelikán, Jan (advisor) ; Borovička, Adam (referee)
The master's thesis deals with the new modification of vehicle routing problem -- 3PL vehicle routing problem with heterogeneous fleet and split delivery. In addition to classical vehicle routing problem, we consider a heterogeneous suppliers fleet and also external carrier, which charges a fixed value per unit of transported goods. The reader is first introduces to vehicle routing problem, its history and possible solutions. Furthermore, the reader is acquainted with logistics and logistics providers. In the main part of this thesis is described 3PL vehicle routing problem and its mathematical model. At first we try to get optimal solution via CPLEX solver. But since this is an NP-hard task, heuristic method is proposed (in two variants) for solving this problem. The heuristic is then tested on the selected test tasks. Results obtained using the proposed heuristics are compared with the optimal solution. Even larger problems are then solved using this heuristics. In the end other modifications and possible improvements of this heuristic method are proposed.
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