Tarun Banka

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An ad hoc grid is a heterogeneous computing and communication system without a fixed infrastructure; all of its components are mobile. Energy management is a major concern in an ad hoc grid. One important aspect of energy management is to minimize the energy consumption during a mission. In an ad hoc grid, communication and computations are deeply(More)
An ad hoc grid is a heterogeneous computing and communication system that allows a group of mobile devices to accomplish a mission, 15 often in a hostile environment. Energy management is a major concern in ad hoc grids. The problem studied here focuses on statically assigning resources in an ad hoc grid to an application composed of communicating subtasks.(More)
Out of order arrival of packets is an inevitable phenomenon on the Internet. Application performance can degrade to a great extent due to out-of-order arrival of packets. Metrics to characterize the degree of reordering will promote the evaluation of network protocols with respect to packet reordering as well as provide a uniformly defined quantitative(More)
has to be relayed to nodes interested in those events. Moreover, nodes may also generate queries to find events they are interested in. Thus there is a need to route the information about the observed events to other nodes in the network. Different routing algorithms have been developed for sensor networks. Routing algorithms that flood the network with(More)
An ad hoc grid is a heterogeneous computing system composed of mobile devices. Each computing resource is constrained in battery energy. The problem being studied is to assign statically computing resources to the subtasks of an application that has an execution time constraint, when the resources are oversubscribed. All subtasks must be executed; to(More)
A formal approach for characterizing, evaluating and modeling packet reordering is presented. Reordering is, a phenomenon that is likely to become increasingly common on Internet, and it can have an adverse impact on end-to-end performance and network resource utilization. Reorder Density (RD) is a comprehensive metric for reordering. Several properties of(More)
Increasing internal parallelism within nodes due to increase in links speeds, and external parallelism among the links due to QoS, ad hoc routing in wireless, etc., point to a significant increase in packet reordering. Application performance degrades considerably due to out-of-order arrivals as well. The concept of " Reorder Buffer-occupancy Density "(More)
—An ad hoc grid is a heterogeneous computing system composed of mobile devices. The problem studied here is to statically assign resources to the subtasks of an application, which has an execution time constraint, when the resources are oversubscribed. Each subtask has a preferred version, and a secondary version that uses fewer resources. The goal is to(More)
Many real-time distributed collaborative applications are emerging that require exchange of critical sensor data among geographically distant end users under resource-constrained network conditions. The QoS requirements, e.g., required bandwidth, latency, acceptable data quality, and reliability are interdependent, and critical to the operation of these(More)