Materials and Energy Research CenterInternational Journal of Engineering1025-249518120050401Resource Investment Problem With Discounted Cash Flows516271574ENS.T.A.NiakiIndustrial Engineering, Sharif University of TechnologyA. A.NajafiChemical & Petroleum Engineering, Sharif University of TechnologyJournal Article19700101A resource investment problem is a project-scheduling problem in which the availability levels of the resources are considered decision variables and the goal is to find a schedule and resource requirement levels such that some objective function optimizes. In this paper, we consider a resource investment problem in which the goal is to maximize the net present value of the project cash flows. We call this problem as Resource Investment Problem with Discounted Cash Flows (RIPDCF) and we develop a heuristic method to solve it. Results of several numerical examples show that the proposed method performs relatively well.http://www.ije.ir/article_71574_6908d8cdfbff6a13e818e3c12e03c7cc.pdf