nowadays, with technology progress and the emergence of new business models, increased levels of competition and changing demands and expectations of customers, using multi channels of distribution is growing rapidly. the coordination and integration of these channels with high efficiency and the elimination of these challenges requires more discussion. the purpose of this study is to investiga...

this paper is aimed at an identification of a farmer's sustainable activities and factors affecting sustainable behavior of farmers. a survey was conducted using a stratified random sampling method to collect data from 370 corn producers in khuzestan province. validity and reliability of the questionnaire was tested and data were analyzed using spss software. based upon the results, it was...

Opportunistic spectrum access is based on channel state information and can lead to important performance improvements for the underlying communication systems. On the other hand adaptive modulation is also based on channel state information and can achieve increased transmission rates in fading channels. In this work we propose the combination of adaptive modulation with opportunistic spectrum...

In modern computer transmission networks the information is transferred by non-cable and cable communication channels, the latter are divided into three fundamental classes: cables on the basis of twisted pairs, coaxial cables and fiber optic communication channels. The fiber optic channels are unidirectional, therefore the full connectivity of a network can be achieved with the help of double ...

The forthcoming mobile communication systems are expected to provide a wide variety of services, from high-quality voice to high-definition videos, through high-data-rate wireless channels anywhere in the world. The high data rate requires broad frequency bands, and sufficient broadband can be achieved in higher frequency bands such as microwave, Ka-band, and millimeter-wave. Broadband wireless...

In the first part of this two-part letter, we introduced methods to study impact dependency on expected value functions two random variables. second part, present tools derive worst- and best-case bounds outage probability multi-user communication systems, including multiple access channels, wiretap reconfigurable intelligent surface-assisted channels.

Scalable, hierarchical, all-optical WDM networks for processor interconnection in multiprocessor systems have been recently considered. The principal objective of this paper is to introduce an access protocol for this type of network which supports a distributed shared memory (DSM) environment. The objectives of the protocol are reduced averagelatency per packet, support of broadcast/multicast,...

IEEE 802.11b networks are becoming more ubiquitous. While roaming through access points, a mobile node is often required to perform a link layer handover. This mechanism causes connection losses and breaks in time-sensitive communication, especially if a network layer handover follows the link layer handover. In this paper, we propose to reduce handoff latency for IEEE 802.11 wireless networks ...

Capacity analysis and computation for communication channels with side information at the receiver is an important area of research. Cover-Chiang have proved the increment of capacity with non-causal information at the receiver. We investigate this capacity increment for the channel with causal side information and proposed an efficient algorithm for computing the capacity of discrete memoryles...