Saif ur Rehman

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IEEE 802.11 uses Distributed Coordination Function (DCF) as default channel access method which is based on Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) where all the nodes compete for the channel access. Based on this mechanism a node cannot transmit until the medium is free. Collision can occur if two or more stations within each(More)
The sale of counterfeit medicine is a continuously growing global problem costing billions of dollars and effecting hundreds of thousands of precious human lives annually. Consumers of medicine have no reliable and simple way of distinguishing genuine medicine from counterfeit. In this paper we analyzed existing techniques of counterfeit medicine(More)
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