| Abstract [eng] |
The purpose of this thesis is to solve the network flow problem of 12 road construction sites. The thesis includes six main parts. In the first section a literature review is conducted to find the research gaps, the trending topics related to optimization of logistics, and to investigate the flow of research through the years on this topic. In this part of the thesis, a total of 52 papers were summarized and classified by the optimization method used. At the beggining of this chapter shows the PRISMA flowchart. After choosing the optimization method of linear programming, the section related to it is expanded further compared to other optimization methods. The second part is methodology, and the mathematical aspects of linear programming are studied. It is very crucial to know every aspect of the problem so that the errors can be managed. The third part is the research and results. Three logistic scenarios are introduced and the mathematical models and corresponding results are presented. The scenarios differ in the arrangement of the logistic nodes and edges, and for each scenario, the transportation cost, the CO2 emission cost, and the loading and unloading of aggregates are calculated. In the fourth section conclusions are drawn based on the analysis and findings in the previous sections. The fifth section is the list of references, and finally, the last section is the Appendix for the codes. |
