This is a special issue of the Iranian Journal of Operations Research that includes some of the invited talks presented at the 11th international conference of the Iranian Operations Research Society (IORS), organized jointly by IORS and Razi University of Kermanshah and held at the Razi University, Kermanshah, Iran, May 2-4, 2018. The IORS conference is held annually and is the main event ...

During recent years, there has been an emerging, upward trend in research and publication of studies on the effects of Ramadan fasting on the healthy population as well as on the populace diagnosed with various diseases and conditions. To publicize the outcomes of these research works, many awareness programs, symposia and conferences are being organized globally. International coordination gro...