محسن اميربيگي

Creating an optimal portfolio for projects is one of the main issues discussed in the projects portfolio management. selec‎ting the right portfolio projects guarantees the excellent performance of the project portfolio management and the organization mission achievement becomes more probable if this combination is chosen more suitably. Two bi-objective models are proposed in this research based on the strategic goals, cost and the time for the optimal selection of the projects portfolio which, by being solved, leads to obtaining a suitable combination of the projects for achieving the maximum value of strategic goals with the minimum cost in the determined time horizon. Different sections of the Iran Railways Company should select and manage their investment for achieving the strategic goals in the 2021 horizon and wisely choose and execute their projects, one of the most important sections of the Iran Railways Company is the signaling and telecommunication section, in where 120 projects are defined. In order to obtain the best combination of the projects and their scheduling in this section of the Iran Railways Company, the models proposed in this paper are implemented and solved by cplex (ver 12.8), gurobi (ver 8), xpress (ver 32.01) and scip (ver 5). Results showed the new model is better. Considering the time overlap and the projects predecessor interrelationship and also considering the contract price adjustment for executing the projects in various periods are of the proposed model’s features. This model was implemented on 120 projects of the signaling and telecommunication section of the Iran Railways Company and after solving by the Pre-emptive priorities method, 81 projects were chosen and scheduled in a way that the Iran railways Company will have the minimum distance with its strategic goals with the minimum cost until the end of 2021.