The Internet has billions of web pages and these web pages are attached to each other using URL(Uniform Resource Allocation). Web crawler is a main module of Search engine that gathers these documents from WWW. Most of the web pages present on Internet are active and changes periodically. Thus, Crawler is required to update these web pages to update database of search engine. In this paper, pri...

We study resource synchronization in multiprocessor hard real-time systems. Speciically, we propose a multiprocessor resource control protocol which allows a job to simultaneously lock multiple global resources, removing a restriction from previous protocols. Allowing nested critical sections may permit a ner granularity of synchronization, increasing parallelism and throughput. All the protoco...

This paper addresses the problem of coordinating multiple robots travelling through an intersection along fixed paths with positive velocities and kinodynamic constraints. The approach relies on a novel tool: a priority graph that encodes the relative order of the robots at the intersection. The overall planning approach can be decomposed into two key components as follows. The entry of robots ...

Several works published over the last two decades have shown for a stylized set-up with homogeneous users that metering-based priority (MBP) schemes may generate Pareto improving departure time adjustments similar to those induced by congestion pricing, but without any financial transaction. We investigate whether MBP (i) still generates significant savings and (ii) remains Pareto-improving, va...

Several distributed mutual exclusion algorithms define the order in which requests are satisfied based on the priorities assigned to requests. These algorithms are very useful for real-time applications ones or those where priority is associated to a quality of service requirement. However, priority based strategies may result in starvation problems where high priority requests forever prevent ...

the present study intended to determine the priority areas for nature-based tourism in isfahan province, iran. considering the components in question, this study was applied-developmental in nature and its methodology was descriptive-survey based on a systematic analysis of the potentials utilization, potential assessment and identification of priority areas and their combination. to carry out ...