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A wireless ad-hoc network is a decentralized type of wireless network. The network is ad hoc because it does not rely on a preexisting infrastructure, such as routers in wired networks or access points in managed (infrastructure) wireless networks. Now a day in fast growing world, use of internet is increasing popularly and at the same time Location-based(More)
Transaction scheduling is an important performance issue in parallel database systems. Here we study the impact of transaction scheduling in the shared-nothing type of architecture. We do not model a particular database system in OUT study. Rather. we use an abstract model of the shared-nothing type of architecture. We consider four transaction scheduling(More)
Mobile devices users in Participatory Sensing Systems (PSS) are required to collect information from their nearby data collection points (DCs). A query normally reveals the identity (id), location, and user profile (e.g., race domain). This information facilitates an adversary PS server to infer over time a comprehensive user location summary with a high(More)
Locking granularity refers to the size of a lockable data unit, called a "granule", in a database system. Fine granularity improves system performance by increasing concurrency level but it also increases lock management overhead. Coarse granularity, on the other hand, sacrifices system performance but lowers the lock management cost. This paper explores(More)
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