Autonomic Communication: Second International IFIP Workshop, by Pan Hui, Augustin Chaintreau, Richard Gass, James Scott, Jon

By Pan Hui, Augustin Chaintreau, Richard Gass, James Scott, Jon Crowcroft, Christophe Diot (auth.), Ioannis Stavrakakis, Michael Smirnov (eds.)

The moment IFIP Workshop on Autonomic conversation (WAC 2005) happened on October 2–5, 2005, in Athens, Greece. the former (and first) variation of WAC happened in Berlin in 2004 and its subsequent (and 3rd) variation in Paris in 2006. The workshop was once equipped by way of the nationwide and Kapodistrian collage of Athens and was once supported via the EU-funded IST-FET Autonomic verbal exchange Coordination motion (ACCA – IST-6475). extra aid was once supplied through the EU-funded IST community of Excellence E-NEXT (IST-506869). ultimately, IFIP TC6 supplied clinical sponsorship via operating teams IFIP WG6. 6 (Management of Networks and dispensed structures) and IFIP WG6. three (Performance of conversation Systems). The workshop used to be prepared at a time while the – but to be good outlined – box of autonomic communique (AC) is attracting the curiosity of either the clinical group and the study investment agencies. The latter is manifested, on one hand, by means of the various fresh appropriate study exploratory boards, workshop panels, initial forward-looking place papers, learn outlooks and frameworks and, however, by means of the dedication of the FET software of the eu fee in Europe to investment long term learn during this quarter for the subsequent 4 years. for that reason, the second one variation of WAC was once hugely exploratory and incorporated a pleasant mixture of technical paintings addressing a few already pointed out difficulties and well-articulated principles at the path this box should still take and the basic difficulties whose resolution might allow autonomicity.

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For the three examples considered above, the fitness mating function takes the following form: φ[x, y] = (x, x) , clonation mating policy, (3) φ[x, y] = (x, x + ξ) , clone-and-mutate mating policy, (4) φ[x, y] = (x, ψ · x + (1 − ψ) · y + ξ)) , combine-and-mutate mating policy, (5) where ψ accounts for the combination operator and ξ is a random variable accounting for the mutation operator. From the structure outlined in the definition, it is clear that E[ξ] = 0 and E[ψ] = 12 . We are interested is in studying the convergence properties of the aforementioned policies.

Formally, Tconv = min ⎝t : i i=1 N ≥ ξ ⎠. , Tconv = min t : min avg min (Ii (t)) ≥ ξ . Clearly, Tconv ≥ Tconv . ,N Service Evolution in a Nomadic Wireless Environment 37 1400 700 1200 600 1000 500 800 Convergence Time (s) Convergence Time (s) smaller such convergence times, the more efficient the evolution process and the ability of the service to adapt to rapidly changing environmental conditions. , the steady-state) of the distributed evolution process, we did not get any quantitative result on the convergence time, that is what in reality impacts the user’s perception of the service quality.

We first discuss the aspects related to genetic operators and other GP parameters. We then discuss future issues of resilience and on-line evolution. 26 L. Yamamoto and C. Tschudin We have modeled homologous recombination which is generally overlooked in GP. By restricting crossover to functionally compatible genes only, we have a high probability of producing viable individuals. In a few earlier experiments we had tried crossover at arbitrary points, and the result was poor score evolution combined with the well-known code bloat phenomenon in GP [2, 22], in which code tends to grow across generations, leading to large, inefficient programs in the long run.

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