Sadegh Feizollahi Articles List

List of Articles Sadegh Feizollahi

Open Access Article
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1 - Development of oil projects scheduling model and modification of project portfolio costs by balancing cost, time, quality and environmental impact objectives and solving it with metahistorical algorithms
Sadegh Feizollahi

Today, the use of new methods of project management and scheduling is an inevitable matter in oil projects. On the other hand, in classic scheduling case, the focus is on balance between time and cost of carrying out projects, which in such a situation, one of possible More

Today, the use of new methods of project management and scheduling is an inevitable matter in oil projects. On the other hand, in classic scheduling case, the focus is on balance between time and cost of carrying out projects, which in such a situation, one of possible solutions to shorten time of implementing project is to accelerate activities. In addition to imposing more costs, this acceleration can also affect the quality of performance and environmental effects. Therefore, in this study, the environmental effects and the quality of the activities were also considered as new indicators the cost-time balancing issue of the project. A new mathematical model with four indicators; cost, time, performance quality and environmental effects are provided. Unlike the traditional models in which only one execution mode was considered to perform the activities and one type of prerequisite relationship between the activities, the execution modes of the activities are multi-mode and the dependency relationships between the activities are generalized from the type of prerequisite relationships and including these types of relationships, brings the issue closer to the real world. Because the problem is NP-hard in large dimensions, meta-heuristic algorithms were used to solve the model. Manuscript profile
Open Access Article
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2 - Development of multi-objectives closed loop supply chain, Emphasizing on saving recycling costs in uncertainty
Sadegh Feizollahi Hosseinali Heydari
20.1001.1.22519165.1400.12.46.25.1

Today, the debate on the recovery and reuse of consumer products has become particularly important. Since the closed loop supply chain is not only a stream of forward but also a reverse flow, therefore, companies are succeeding to create a direct and reverse supply chai More

Today, the debate on the recovery and reuse of consumer products has become particularly important. Since the closed loop supply chain is not only a stream of forward but also a reverse flow, therefore, companies are succeeding to create a direct and reverse supply chain of integrity. In the present study, after reviewing the subject literature, a more completed and comprehensive model is presented than the previous models. The model is multi-objective, multi-level, and single-product with product return in the uncertain conditions. The objective functions of the model include minimizing costs, increasing the profit from the quality of the recycled product, increasing the cost savings from recycling and environmental impacts. In order to solve the multi-objective problem approach (TH) is used, which is one of the methods for converting multi-objective functions to single-objective. To validate the proposed model, a numerical example of the design was solved and for analyzed using the GAMS software. And the results of the sensitivity analysis are described below. Manuscript profile

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List of Articles Sadegh Feizollahi