Download e-book for iPad: An Introduction to Models of Online Peer-to-Peer Social by George Kesidis, Jean Walrand

By George Kesidis, Jean Walrand

ISBN-10: 1608450791

ISBN-13: 9781608450794

This booklet issues peer-to-peer functions and mechanisms working on the web, quite those who aren't totally computerized and contain major human interplay. So, the world of curiosity is the intersection of dispensed platforms and on-line social networking. often, basic versions are defined to elucidate the information. starting with brief overviews of caching, graph concept and online game conception, we disguise the fundamental principles of dependent and unstructured seek. We then describe an easy framework for reputations and for iterated referrals and consensus. This framework is utilized to an issue of sybil identification administration. the basic outcome for iterated Byzantine consensus for a comparatively vital factor can also be given. ultimately, a straight-forward epidemic version is used to explain the propagation of malware online and for BitTorrent-style file-sharing. This brief booklet can be utilized as a initial orientation to this material. References are given for the scholar to papers with reliable survey and educational content material and to these with extra complex remedies of particular themes. For an teacher, this e-book is appropriate for a one-semester seminar direction. on the other hand, it can be the framework for a semester's worthy of lectures the place the teacher might complement every one bankruptcy with extra lectures on comparable or extra complicated subject material. A simple heritage is needed within the components of desktop networking, chance idea, stochastic tactics, and queueing. desk of Contents: Networking evaluate / Graphs / video games / seek in based networks / seek in unstructured networks / Transactions, reputations, and referrals / fake Referrals / Peer-to-peer dossier sharing / Consensus in dynamical trust platforms / Byzantine consensus / Epidemics

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Additional resources for An Introduction to Models of Online Peer-to-Peer Social Networking

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20 2. , P(d = x) ∝ x −ρ for some ρ > 0 and for all sufficiently large integers x. , with specific values of ρ) has been empirically observed in many networking settings [25, 49, 53]. In [25, 139], the following preferential-attachment iteratively generative graph model was described employing a single strictly positive parameter α < 1. , the new vertex has out-degree one and is connected to an existing vertex selected at random. , after iteration k = 1, to have one vertex and one selfedge. As a consequence of the following result, the out-degree distribution of Gk = (Vk , Ek ) approaches a power law with parameter ρ = 1/(1 − α) as k → ∞.

Exponentials with mean 1, and let Sn = X1 + · · · + Xn . Then, (A1 , . . , AN ) ∼ (X1 , . . XN |SN = 1) by conditional uniformity [157]. From this one can directly compute E(A1 + · · · + Ak |SN ) and var(A1 + · · · + Ak |SN ) and then evaluate at SN = 1. To compute the density fB of B, note that B ∼ (Sk |SN = 1), implies P(B ∈ dx) = P(Sk ∈ dx, SN ∈ dt) . P(SN ∈ dt) t=1 Let fm (x) be the density of Sm (which is gamma): fm (x) = x m−1 −x e . (m − 1)! 4. DISCUSSION Hence, fB (x) = 47 fk (x)fN −k (1 − x) ∝ x k−1 (1 − x)(n−1)k−1 fN (1) which is beta distributed with parameters α=k and β = (n − 1)k.

Ch. 2 of [53] for the classical Erdos-Renyi random graph (with the parameters |V | and η, each of the |V2 | possible bidirectional edges is independently present with probability η/(|V | − 1)). 2. 1 So, we choose to bias our measurement of diameter to path-lengths centered on more popular vertices. 20 2. , P(d = x) ∝ x −ρ for some ρ > 0 and for all sufficiently large integers x. , with specific values of ρ) has been empirically observed in many networking settings [25, 49, 53]. In [25, 139], the following preferential-attachment iteratively generative graph model was described employing a single strictly positive parameter α < 1.

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An Introduction to Models of Online Peer-to-Peer Social Networking by George Kesidis, Jean Walrand


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