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تعداد نتایج: 120811 فیلتر نتایج به سال:
To enhance the saturation throughput in Vehicular Ad-hoc NETworks (VANETs), one of solutions is a variable Control CHannel Interval (CCHI) multichannel Medium Access Control (MAC) scheme. Recently, the HER-MAC is more reliable and efficient in both the safety message broadcast and the service channel utilization. HER-MAC which requires lower time for reservation period than IEEE 1609.4 improves...
The use of directional antennae in ad-hoc networks has received growing attention in recent years. However, most directional MAC protocols assume interchangeable directional and omni-directional modes of operation. Such operation reduces the spatial gain and introduces the asymmetry in gain problem. In this paper, we propose a directional-to-directional (DtD) MAC protocol for ad-hoc networks th...
The Cognitive Radio Sensor Network (CRSN) is considered as a viable solution to enhance various aspects of the electric power grid and to realize a smart grid. However, several challenges for CRSNs are generated due to the harsh wireless environment in a smart grid. As a result, throughput and reliability become critical issues. On the other hand, the spectrum aggregation technique is expected ...
1Biomedical Genetics Section and 2Division of Hematology/Oncology, Department of Medicine, Boston University School of Medicine, Boston, MA; 3Department of Pediatrics and Adolescent Medicine, University of Hong Kong Li Ka Shing Faculty of Medicine, and Queen Mary Hospital, Hong Kong, China; 4Department of Pediatrics and Adolescent Medicine, Chinese University of Hong Kong Faculty of Medicine, a...
Decreasing quality of forest habitats is among the major factors leading to a loss of epiphytic lichen diversity. However, there is little information about how this factor influences the diversity of terricolous lichens, which do not grow over living trees and could be less susceptible to such disturbances. In this work we describe the genetic diversity of Peltigera terricolous cyanolichens an...
This paper presents an analytical model for estimating energy consumption in Y-MAC protocol for Wireless Sensor Networks (WSN). This protocol has been proposed to reduce the energy consumption of a node when involved in unicast or broadcast transmission of frames. In WSN a node consumes energy in transmitting and receiving of data, listening transmissions of other nodes, and in sleep mode. Ther...
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