List of Articles Resource optimization Open Access Article Abstract Page Full-Text 1 - Combination of Data Envelopment Analysis and Non-Linear Programming: A Novel Hybrid for Optimizing the Allocation of the Fixed-Cost in the Project Portfolio Farhad Khazaeli Hosein Arman Mohammadreza Zare Open Access Article Abstract Page Full-Text 2 - Relationship between e-learning and integrated management with the mediating role of human resource optimization with the performance of secondary school principals city in Neka fatemeh soghra sina Open Access Article Abstract Page Full-Text 3 - The Role of Enterprise Resource Planning Systems (ERP) in Organizational Productivity Case Study: Tabriz Tractor Manufacturing Company batool zareie