List of Articles ورودی- خروجی Open Access Article Abstract Page Full-Text 1 - Classifying Flexible Factors Using Fuzzy Concept S. Saati N. Imani Open Access Article Abstract Page Full-Text 2 - Total and Partial efficiency indexes in data envelopment analysis S. Kordrostami A.R Amirteimoori Open Access Article Abstract Page Full-Text 3 - Productivity changes of units: A directional measure of cost Malmquist index G. Tohidi S. Tohidnia Open Access Article Abstract Page Full-Text 4 - Efficiency Optimization Control of IPM Synchronous Motor Drives with Online Parameter Estimation Sadegh Vaez-Zadeh Mehran Zamanifar