21,227 research outputs found
Synchronization on community networks
In this Letter, we propose a growing network model that can generate
scale-free networks with a tunable community strength. The community strength,
, is directly measured by the ratio of the number of external edges to
internal ones; a smaller corresponds to a stronger community structure.
According to the criterion obtained based on the master stability function, we
show that the synchronizability of a community network is significantly weaker
than that of the original Barab\'asi-Albert network. Interestingly, we found an
unreported linear relationship between the smallest nonzero eigenvalue and the
community strength, which can be analytically obtained by using the
combinatorial matrix theory. Furthermore, we investigated the Kuramoto model
and found an abnormal region (), in which the network has even
worse synchronizability than the uncoupled case (C=0). On the other hand, the
community effect will vanish when exceeds 0.1. Between these two extreme
regions, a strong community structure will hinder global synchronization.Comment: 4 figures and 4 page
Support Service for Reciprocal Computational Resource Sharing in Wireless Community Networks
In community networks, individuals and local organizations from a geographic area team up to create and run a community-owned IP network to satisfy the community's demand for ICT, such as facilitating Internet access and providing services of local interest. Most current community networks use wireless links for the node interconnection, applying off-the-shelf wireless equipment. While IP connectivity over the shared network infrastructure is successfully achieved, the deployment of applications in community networks is surprisingly low. To address the solution of this problem, we propose in this paper a service to incentivize the contribution of computing and storage as cloud resources to community networks, in order to stimulate the deployment of services and applications. Our final goal is the vision that in the long term, the users of community networks will not need to consume applications from the Internet, but find them within the wireless community network
Towards distributed architecture for collaborative cloud services in community networks
Internet and communication technologies have lowered the costs for communities to collaborate, leading to new services like user-generated content and social computing, and through collaboration, collectively built infrastructures like community networks have also emerged. Community networks get formed when individuals and local organisations from a geographic area team up to create and run a community-owned IP network to satisfy the community’s demand for ICT, such as facilitating Internet access and providing services of local interest.
The consolidation of today’s cloud technologies offers now the possibility of collectively built community clouds, building upon user-generated content and user-provided networks towards an ecosystem of cloud services. To address the limitation and enhance utility of community networks, we propose a collaborative distributed architecture for building a community cloud system that employs resources contributed by the members of the community network for provisioning infrastructure and software services. Such architecture needs to be tailored to the specific social, economic and technical characteristics of the community networks for community clouds to be successful and sustainable. By real deployments of clouds in community networks and evaluation of application performance, we show that community clouds are feasible. Our result may encourage collaborative innovative cloud-based services made possible with the resources of a community.Peer ReviewedPostprint (author’s final draft
Growing community networks with local events
The study of community networks has attracted considerable attention
recently. In this paper, we propose an evolving community network model based
on local processes, the addition of new nodes intra-community and new links
intra- or inter-community. Employing growth and preferential attachment
mechanisms, we generate networks with a generalized power-law distribution of
nodes' degrees.Comment: 9 pages, 2 figures, Latex Styl
Prototyping Incentive-based Resource Assignment for Clouds in Community Networks
Wireless community networks are a successful example of a collective where communities operate ICT infrastructure and provide IP connectivity based on the principle of reciprocal resource sharing of network bandwidth. This sharing, however, has not extended to computing and storage resources, resulting in very few applications and services which are currently deployed within community networks. Cloud computing, as in today's Internet, has made it common to consume resources provided by public clouds providers, but such cloud infrastructures have not materialized within community networks. We analyse in this paper socio-technical characteristics of community networks in order to derive scenarios for community clouds. Based on an architecture for such a community cloud, we implement a prototype for the incentive-driven resource assignment component, deploy it in a testbed of community network nodes, and evaluate its behaviour experimentally. Our evaluation gives insight into how the deployed prototype components regulate the consumption of cloud resources taking into account the users' contributions, and how this regulation affects the system usage. Our results suggest a further integration of this regulation component into current cloud management platforms in order to open them up for the operation of an ecosystem of community cloud
A look at energy efficient system opportunities with community network clouds
Community networking is an emerging model of a shared communication infrastructure in which communities of citizens build and own open networks. Community networks offer successfully IP-based networking to the user. In addition, some hosts are connected to the network nodes in order to provide network management and end user services. Recently, clouds have been proposed for community networks. Some research projects such as Clommunity have started deploying computational infrastructure to enable cloud computing within community networks. In this paper we propose different options for such community clouds to contribute to energy efficient systems, in particular regarding cloud-based services and in relation to Smart Grid. Further discussion and interaction with the research initiatives on energy efficient systems should identify the most promising approach and outline possible ways for implementation.Peer ReviewedPostprint (published version
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