By Roger Wattenhofer (auth.), Sándor P. Fekete (eds.)
This ebook constitutes the reviewed complaints of the Fourth overseas Workshop on Algorithmic features of instant Sensor Networks, ALGOSENSORS 2008, held in Reykjavik, Iceland, Wroclaw, Poland, July 12, 2008.
The workshops geared toward bringing jointly learn contributions concerning varied algorithmic and complexity-theoretic features of instant sensor networks. the subjects contain yet aren't constrained to optimization difficulties, noise and likelihood, robots and excursions.
Read or Download Algorithmic Aspects of Wireless Sensor Networks: Fourth International Workshop, ALGOSENSORS 2008, Reykjavik, Iceland, July 2008. Revised Selected Papers PDF
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Additional info for Algorithmic Aspects of Wireless Sensor Networks: Fourth International Workshop, ALGOSENSORS 2008, Reykjavik, Iceland, July 2008. Revised Selected Papers
There are several goals for optimization, for example throughput, latency, reliability, security and energy consumption, the last one being the most important in sensor networks. Almost all of these diﬀerent approaches, however, construct one or sometimes several routing trees. There has been previous work on minimzing the time for data gathering. In  a problem similar to ours is studied, a 4-approximation algorithm is given and NP-hardness of the problem shown. A problem with variable release times is studied in .
Additionally, d(vkt , s)/σ ≤ Ck − t because otherwise k could not reach the sink by time Ck . Now for each round t ∈ [t + 1/σ, ti ] a packet in Mi (t) is sent. In particular, there must be a packet from the set ∪t∈(t ,ti ] Mi (t), call it q, that arrives at the sink Minimizing Average Flow Time in Sensor Data Gathering 25 no later than j would arrive if j were always sent from round t + 1/σ on. We have t +/σ Cq ≤ (t + 1/σ) + d(vj , vkt ) + d(vkt , s) /σ ≤ Ck + (dI + 2)/σ = Ck + γ/σ. That is, packet q ∈ S(i) arrives at most γ/σ time units after packet k ∈ J \ S(i), which contradicts the fact that q and k are in diﬀerent components.
9th Symp. on Discrete Algorithms, pp. 270–279. : Hardness and approximation of gathering in static radio networks. : An approximation algorithm for the wireless gathering problem. , Freivalds, R. ) SWAT 2006. LNCS, vol. 4059, pp. 328–338. : Minimizing ﬂow time in the wireless gathering problem. In: Proc. 25th Symp. on Theoretical Aspects of Computer Science, pp. 109–120. : Online Computation and Competitive Analysis. : Extra unit-speed machines are almost as powerful as speedy machines for competitive ﬂow time scheduling.
Algorithmic Aspects of Wireless Sensor Networks: Fourth International Workshop, ALGOSENSORS 2008, Reykjavik, Iceland, July 2008. Revised Selected Papers by Roger Wattenhofer (auth.), Sándor P. Fekete (eds.)