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Consumer ratings are widely used in online marketplaces—helping vendors in assessing the quality of offerings and consumers in discovery and purchase decisions. To build trust in a marketplace, which has a direct impact on sales, an accurate assessment of ratings is essential in determining the quality of offerings. This paper proposes novel extensions to consumer Rating as a Service (RaaS)—a rating...
Nowadays, cloud computing is an emerging technology thanks to its ability to provide on-demand computing services (hardware and software) with less description standardization effort. Multiple issues and challenges in discovering cloud services appear due to the lack of the cloud service description standardization. In fact, the existing cloud providers describe, their similar offered services in...
The currently dominating market mechanism for selling IaaS resources is the so called supermarket approach: Consumer buy resources from providers without negotiation. The recent development of Amazon EC2 spot market shows that dynamic market mechanisms are becoming increasingly popular. The so called Bazaar approach is such a dynamic market mechanism. On a Bazaar-base market consumer and provider...
This paper reports on the results of the survey regarding the Research and Education (R&E) clouds in a number of world regions covered by the CHAIN-REDS project, including the sub-Saharan Africa. The survey includes the technical aspects of R&E clouds, as well as issues related to interoperation, interoperability, compatibility, orchestration and federation. Results obtained show a high interest...
Cloud computing (the delivery of computing as services rather than products) creates new challenges with respect to openness. Existing approaches such as open source licensing of software products have proven inadequate in a service-oriented world; attempts to address the limitations by closing the “service provider loophole” have failed to gain traction. Similarly, multiple providers are yet to fully...
As the sector of SaaS is being evolved, the need of portability and effective orchestration of Cloud-enabled applications over virtualised infrastructures is more apparent. In this paper we present a proof of concept (PoC) project together with industry partners which deals with the management of portable Cloud applications. Experimentation with a multi-tier Cloud application use case gives insights...
Monitoring and reconfiguration are critical issues in Cloud environments. Monitoring allows to detect violations and specific events, while reconfiguration allows to activate corrective mechanisms or runtime modifications. In this paper we propose an extension for Open Cloud Computing Interface (OCCI) to enable monitoring and reconfiguration. The extension describes the needed elements to manage (i...
Cloud infrastructures provide compelling features for scientific and engineering applications. Federated clouds additionally promise improved scalability via access to a larger pool of resources and improved service availability through geographically distributed redundant servers. Effective use of federated clouds requires the creation of portable appliances and consistent appliance management techniques...
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