Download Algorithmic Aspects of Wireless Sensor Networks: 5th by Erik D. Demain (auth.), Shlomi Dolev (eds.) PDF

By Erik D. Demain (auth.), Shlomi Dolev (eds.)

ISBN-10: 364205434X

ISBN-13: 9783642054341

This e-book constitutes the reviewed complaints of the fifth foreign Workshop on Algorithmic facets of instant Sensor Networks, ALGOSENSORS 2009, held in Rhodes, Greece, July 10-11, 2009.

The 21 complete papers and short bulletins have been conscientiously chosen from forty-one submissions. This workshops geared toward bringing jointly study contributions relating to different algorithmic and complexity-theoretic points of instant sensor networks. the subjects comprise yet aren't restricted to optimization difficulties, noise and chance, robots and tours.

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The exact resilience of A seems much more difficult to compute in general. t s s t (a) (b) (c) Fig. 1. (a) An st-path in a disk arrangement A. (b) Dual of A with corresponding path highlighted. (c) An arrangement with thickness 2 and resilience 1 (bold disks correspond to double sensors). Our motivation is to extend the analysis of what we call barrier resilience beyond the restricted contexts (regions separated by either open or closed belts) examined by Kumar et al. [12]. While there is evidence to suggest that determining the exact resilience of an arbitrary sensor configuration with arbitrary regions S and T is hard, we show that for configurations of sensors with identical disk coverage regions there is a close relationship between thickness and resilience.

The battery charge decreases with each transmission. The network lifetime is the number of rounds performed from network initialization to the first node failure due to battery depletion. We assume that all the nodes share the same frequency band, and time is divided into equal size slots that are grouped into frames. Thus, our MAC layer is based on TDMA scheduling [5,6,7], such that collisions and interferences do not occur. Many papers considered fractional version of the problem when splitting of packets into fractional portions is allowed.

4 Matching Upper Bound for Two Processors We now show the upper bound. That is, we give the deterministic algorithm for two devices. In particular, for any initial offset of at most n, we show a schedule where two processors meet √ with probability equal to one inside a “time-window” of length W = 2n + 4 n + 2. √ Theorem√2. For any n, there exists a string of length W = 2n + 4 n + 2 with at most 4 n + 4 ones such that this string will overlap itself for all shifts from 1 to n. We remark that the bound that we prove in the above section is in fact more general than the subsequent independent work of [12], which appeared after our report [8].

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