abstract: country’s fiber optic network, as one of the most important communication infrastructures, is of high importance; therefore, ensuring security of the network and its data is essential. no remarkable research has been done on assessing security of the country’s fiber optic network. besides, according to an official statistics released by ertebatat zirsakht company, unwanted disconnec...

ackground: In three decades, researchers have tried to make clear epistemological foundation in the field of disability. These models play an important role in providing theoretical-practical support and services for people with special needs. The purpose of this study is to evaluate models of disability rehabilitation. Method: The research method was theoretical method. For this purpose, th...