By Viktor K. Prasanna (auth.), Sotiris E. Nikoletseas, José D. P. Rolim (eds.)

This quantity comprises the contributed papers and invited talks offered on the 1stInternationalWorkshoponAlgorithmicAspectsofWirelessSensorNetworks (ALGOSENSORS 2004), which used to be held July sixteen, 2004, in Turku, Finland, - situated with the thirty first overseas Colloquium on Automata, Languages, and Programming (ICALP 2004). instant advert hoc sensor networks became a crucial study topic because of their power to supply different providers in several appli- tions. the conclusion of sensor networks calls for in depth technical examine and improvement e?orts, specifically in power-aware scalable instant advert hoc c- munications protocols, as a result of their strange software standards and serious constraints. nonetheless, a superb theoretical heritage turns out beneficial for sensor networks to accomplish their complete strength. it's an algorithmic problem to accomplish e?cient and strong realizations of such huge, hugely dynamic, advanced, n- traditional networking environments. positive aspects, together with the large variety of sensor units concerned, the serious strength, computational and reminiscence limi- tions, their dense deployment and widespread mess ups, pose new layout, research and implementation demanding situations. This occasion is meant to supply a discussion board for researchers and practitioners to give their contributions on the topic of all features of instant sensor networks. subject matters of curiosity for ALGOSENSORS 2004 have been: – Modeling of speci?c sensor networks. – tools for advert hoc deployment. – Algorithms for sensor localization and monitoring of cellular clients. – Dynamic sensor networks. – Hierarchical clustering architectures. – Attribute-based named networks. – Routing: implosion matters and source administration. – verbal exchange protocols. – Media entry keep watch over in sensor networks. – Simulators for sensor networks.

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A SNR of 14 dB is chosen in order to declare a packet received without errors. If the source of the transmission is 40 meters away (node 40), this results in an interference range of 100 meters, as illustrated by the dashed circle around the node number 41. e. the range up to which a transmission is detected, and the medium is declared nonidle. A transmission is initiated by node 40 only if the medium is found idle, corresponding to the situation where none of the 37 nodes located within the dotted circle is transmitting.

26. Leslie G. Valiant and Vijay V. Vazirani. NP is as easy as detecting unique solutions. Theoretical Computer Science, 47(1):85–93, 1986. 27. Roy Want, Andy Hopper, Veronica Falc˜ ao, and Jonathan Gibbons. The active badge location system. 1, Olivetti Research Ltd. (ORL), 24a Trumpington Street, Cambridge CB2 1QA, 1992. 28. A. Ward, A. Jones, and A. Hopper. A new location technique for the active office. IEEE Personal Communications, 4(5):42–47, 1997. 29. M. Weiser. Some computer science problems in ubiquitous computing.

Such an algorithm can be used to solve UNIT DISK GRAPH RECONSTRUCTION by applying it to an instance of the problem (that may or may not have a solution). After reaching its polynomial time bound, the algorithm will either have returned a solution or not. In the first case, we can check if the solution returned is consistent with the distance constraints in the UNIT DISK GRAPH RECONSTRUCTION instance in polynomial time, and accept if and only if the check succeeds. In the second case, we can reject the instance.

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