In this paper, a slotted ALOHA-based cognitive radio (CR) network is proposed and the throughput performance of the proposed CR network model under Rayleigh fading channels is examined. Our CR network contains two special groups of users, primary users (PUs) and CR users (CRUs), and they are considered to be sharing a timeslotted-based common communication channel. While PUs can access the chan...

The purpose of this research was to assess the role of educational factors in protecting urbanlandscapes in Tehran Metropolitan. This is a quantitative research, applied and descriptivecorrelationmethod was used. The research population consisted of all participants in educationalcourses held by Tehran municipality (N=300) and 172 of them selected by using simple randomsampling method. To gathe...

We focus on an opportunistic communication system consisting of multiple independent channels with time-varying states. With limited sensing, a user can only sense and access a subset of channels and accrue rewards determined by the states of the sensed channels. We formulate the problem of optimal sequential channel selection as a restless multi-armed bandit process, for which a powerful index...

The Network-on-Chip (NoC) paradigm is currently known as an alternative solution for the on chip communication in the next SoC generation, especially, asynchronous NoCs. One of the challenges for asynchronous NoC-based systems design is testing asynchronous network architectures for manufacturing defects. To improve the testability of asynchronous NoCs, we have developed a scalable and configur...