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Green Cloud Computing
Published in Matthew N. O. Sadiku, Emerging Green Technologies, 2020
Cloud computing provides three service models and four deployment models. The available service models are classified as SaaS (Software-as-a-Service), PaaS (Platform-as-a-Service), and IaaS (Infrastructure-as-a-Service). Virtualization plays a crucial role in managing these services. Cloud infrastructures use virtualization techniques for sharing of resources. The cloud deployments are classified mainly into four types: Public Cloud, Private Cloud, Community Cloud, and Hybrid Cloud, as illustrated in Figure 9.1 [8]. A public cloud is characterized by public availability of the cloud services. It describes cloud computing in the traditional mainstream sense. It is a pay-as-you-go implementation for the public, while a private cloud is not made available to the public. A community cloud is utilized via a collection of organizations that have common interest. A hybrid cloud is a combination of a public cloud and a private cloud [9].
Evaluation Criteria to Run Scientific Applications in the Cloud
Published in Olivier Terzo, Lorenzo Mossucca, Cloud Computing with e-Science Applications, 2017
Eduardo Roloff, Alexandre da, Silva Carissimi, Philippe Olivier, Alexandre Navaux
In a community cloud, the users are members of one organization, and this organization has a set of resources that are connected to resources in other organizations. A user from one of the organizations can use the resources of all other organizations. The advantage of this model is the provision of access to a large set of resources without charging because the remote resources belong to other organizations that form the community and not to a provider. In other words, the pay-per-use model may not be applicable to this type of cloud. One disadvantage of the model is the limited number of resources; they are limited to the number of machines that are part of the community cloud. The interconnection between all the members constitutes a bottleneck for the application’s execution. If the application needs more machines than are available in single site (a single member), the machines need to be allocated among two or more members.
The Cloud and Cloud Computing
Published in Stephan S. Jones, Ronald J. Kovac, Frank M. Groom, Introduction to COMMUNICATIONS TECHNOLOGIES, 2015
Stephan S. Jones, Ronald J. Kovac, Frank M. Groom
The cloud can be deployed to you in many variations. In a private cloud, you have access only if you are a member of that corporation, organization, or group. In a public cloud, everybody who has Internet access can avail themselves of the delivery models available. A hybrid cloud is a combination of both the private and public cloud and is the fastest growing model of deployment. A community cloud is a private cloud that is made available to a group of people from different organizations that sign up for its use.
A Survey on Cloud Computing Applications in Smart Distribution Systems
Published in Electric Power Components and Systems, 2018
Jeovane V. de Sousa, Denis V. Coury, Ricardo A. S. Fernandes
In a private cloud, the infrastructure is provisioned for exclusive use by a single organization. It is typically owned, managed, and operated by the organization itself, by a third party, or some combination of them. On the other hand, in a public cloud, the infrastructure is provisioned for open use by the general public. It may be owned, managed, and operated by a service provider. A community cloud is similar to the private cloud but serves a group of organizations who have similar type of requirements or shared concerns, and may be owned, managed, and operated by one or more of the organizations in the community, a third party, or some combination of them. At last, a hybrid cloud is a composition of two or more distinct clouds (private, community, or public) that remain as distinct entities but are bound together by standardized or proprietary technology that enables data and application portability.
Taxonomy for Identification of Security Issues in Cloud Computing Environments
Published in Journal of Computer Information Systems, 2018
Monjur Ahmed, Alan T. Litchfield
Cloud Computing is categorized either as a private, public, hybrid, or community Cloud [13, 62, 82]. Private Cloud: The Cloud infrastructure that is operated and managed by private organizations or by some outsourced specialist third party. It could be either off-premise or on-premise.Public Cloud: The Cloud infrastructure or services open for the public. It is normally operated and managed by single Cloud service provider and services are open to be subscribed by any entity (Cloud users).Hybrid Cloud: A mix of any of the Clouds above (at least two). The Cloud environment retains distinct characteristics of private and public sectors, but provides portability through load balancing and options to switch services.Community Cloud: Is shared by more than one organization and is intended for use by a community of entities with common concerns, interests, or goals.
A Comparative Review on Homomorphic Encryption for Cloud Security
Published in IETE Journal of Research, 2021
Ganesh Kumar Mahato, Swarnendu Kumar Chakraborty
A Community cloud refers to the collaboration efforts of several organizations from a particular community having similar concerns such as jurisdiction, security, etc. It can be hosted internally or externally and can be maintained internally by an organization or by a third party. Several organizations have used it and have shared their interest because the cost is spread over fewer users, which thereby minimizes the expenses.