Rashid Mehmood

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Solving sparse systems of linear equations is at the heart of scientific computing. Large sparse systems often arise in science and engineering problems. One such problem we consider in this paper is the steadystate analysis of Continuous Time Markov Chains (CTMCs). CTMCs are a widely used formalism for the performance analysis of computer and communication(More)
In this paper, a multiple-input multiple-output (MIMO) technique for indoor optical wireless (OW) communication is proposed. The scheme is called optical spatial modulation (OSM). The key concept is based on spatial modulation (SM) technique. At each time instant, only one transmitter is active and the others are inactive. Each transmitter index corresponds(More)
Vehicular Ad-hoc Networks (VANETs) are the most prominent enabling network technology for Intelligent Transportation Systems. VANETs provide many new exciting applications and opportunities albeit transportation safety and facilitation applications are their core drivers. Security of vehicular networks remains the most significant concern in VANETs(More)
BACKGROUND Alcohol abuse is a leading cause of pancreatitis in humans. However, rodent models suggest that alcohol only sensitizes the pancreas to subsequent insult, indicating that additional factors play a role in alcohol-induced pancreatic injury. The goal of this study was to determine if an absence of MIST1, a transcription factor required for complete(More)
Wireless ad hoc networks are characterized by frequent topology changes, unreliable wireless channel, network congestion and resource contention. Multimedia applications usually are bandwidth hungry with stringent delay, jitter and loss requirements. Designing ad hoc networks which support multimedia applications, hence, is considered a hard task. In this(More)
BACKGROUND Secretion of calcium in saliva depends upon salivary flow rates in non-tobacco users and greater is the rate, lower is the concentration and vice versa. In long-term tobacco users the taste receptors, a primary site for salivary secretion, are constantly exposed to tobacco for long time thus presumably affecting the salivary reflex. Therefore the(More)
We characterize the previously unrecognized phenomenon of axotomy-induced axonogenesis in rat embryonic hippocampal neurons in vitro and elucidate the underlying mechanism. New neurites arose from cell bodies after axotomy and grew. These neurites were Tau-1-positive, and the injured axons showed negative immunoreactivity for Tau-1. Axonogenesis was delayed(More)
In this paper, we discuss and evaluate our two metro wavelength division multiplexing (WDM) ring network architectures for variable-length packet traffic. The paper begins with a brief review of the relevant architectures and protocols in the literature. Subsequently, the network architectures along with their medium access control (MAC) protocols are(More)