Routing in delay tolerant networks (DTN) is a challenging problem because at any given time instance, the probability that there is an end-to-end path from a source to a destination. Opportunistic delay tolerant networks are organized by the sporadic connectivity between their nodes and the lack of stable paths from sender to receiver. Future connections are mostly unknown in these networks sen...

The underwater acoustic channel features long and variable propagation delay, high bit error rate and limited bandwidth. Moreover, underwater mobile networks consisting of Autonomous Underwater Vehicles (AUVs) for surveillance and monitoring applications often suffer from intermittent connectivity as nodes move around the area of operations. Therefore, this scenario is appropriately modeled as ...

We address exponential stability of switched nonlinear singular systems with time-delay in which delay is time varying and presents in the states. For switched nonlinear singular time-delay systems with average dwell-time switching signals, we provide sufficient conditions, in terms of linear matrix inequalities (LMIs) to guarantee the exponential stability of such systems. By using Lyapunov–li...

| In an on-demand video system, requests for a video le arriving within a period of time can be batched together and served with a single multicast stream; thereby reducing the bandwidth requirement compared with the un-batched case. In this paper, we study various batching schemes to meet delay and prootability requirements | in the window-size based and moving-average schemes, maximum and ave...

We investigate the impact of delay announcements on the coordination within hospital networks using a combination of empirical observations and numerical experiments. We offer empirical evidence which suggests that patients take delay information into account when choosing emergency service providers and that such information can help increase coordination in the network, leading to improvement...

A description is given of the application of the Synchronous Detector technique for eleciroretinographic (ERG) measurements (cone function) in patients with retinitis pigmentosa. The results obtained, in terms of average amplitudes and average "delay time," are compared with the results obtained by conventional waveform averaging processes. Time delay measurements with the Synchronous Detector ...

Most of prior works optimize caching policies based on the following assumptions: 1) every user initiates request according to content popularity, 2) all users are with the same activity level, and 3) users are uniformly located in the considered region. In practice, these assumptions are often not true. In this paper, we explore the benefit of optimizing caching policies for base stations by e...

The residual range delay error due to an incompletely modelled tropospheric propagation delay can usually be ignored by the average user of wide-area differential GPS. In general the atmosphere is “well behaved” and the use of standard range delay algorithms supplied with standard atmosphere parameter values will adequately model the “average” atmospheric conditions. It is possible however, for...

We consider the problem of minimizing average paging cost subject to delay constraints in a wireless system. Previous work assumed the unit to be found did not move during the paging process whereas here the unit may change location during polling events. We show that the conditionally most probable locations, given that the unit has not yet been found, should be searched first. We find the opt...