The cloud architecture is usually composed of several XaaS layers—including Software as a Service (SaaS), Platform as a Service (PaaS) and Infrastructure as a Service (IaaS). The previous work studies efficient resource allocation to optimize objectives of cloud users, IaaS provider and SaaS provider in cloud computing. This work proposes the composition of different layers in the cloud, such a...

Infrastructure as a service (IaaS) systems offer on demand virtual infrastructures so reliably and flexibly that users expect a high service level. Therefore, even with regards to internal IaaS behaviour, production clouds only adopt novel ideas that are proven not to hinder established service levels. To analyse their expected behaviour, new ideas are often evaluated with simulators in product...

Most commonly found as… … Indole-3-acetic acid or IAA. What is it? IAA is a weak acid similar to tryptophan. Its existence was first suggested by the Darwin brothers as a compound responsible for 'the power of movement in plants', but it was not named and chemically defined until much later. What does it do? Everything! What, everything? Yes, auxin apparently regulates almost everything in plan...

Infrastructure as a Service (IaaS) is a delivery model of cloud computing, which provides the ability to users to acquire and release resources according to their demand and pay according to their usage. Resources are provisioned from the cloud as Virtual Machines (VMs), many of which can be deployed on a single computing node, realizing a multi-tenancy model. While virtualization and multitena...

Infrastructure-as-a-Service (IaaS) is the most acceptable Cloud computing delivery model that IT managers are exploring as they relook at their IT infrastructure. Since the beginning of Cloud computing as a new and emerging paradigm, the field of Distributed Systems is amidst a stage of redefinition. Due to this, there are a wide variety of Cloud solutions, ranging from virtualization technolog...

With the advent of virtualization and Infrastructure-as-a-Service (IaaS), the broader scientific computing community is considering the use of clouds for their technical computing needs. This is due to the relative scalability, ease of use, advanced user environment customization abilities, and the many novel computing paradigms available for data-intensive applications. However, there is still...

We propose a novel Infrastructure-as-a-Service composition framework that selects an optimal set of consumer requests according to the provider’s qualitative preferences on long-term service provisions. Decision variables are included in temporal conditional preference networks represent for both short-term and consumers. The global ranking is computed using k -d tree indexing-based similarity ...

The large scale IaaS systems could store virtual appliances in several repositories. The deployment time could heavily vary depending on the connection properties of the repository storing the appliance. A virtual appliance is a virtual machine image designed to run on a virtualization platform i.e. Virtual Box, Xen, VMware Workstation. Virtual appliance delivery requires the modification of th...

The purpose of this article is to report the feasibility and preliminary results of the treatment of isolated iliac artery aneurysms (IAAs) with Anaconda limbs (Vascutek Ltd., Inchinnan, Renfrewshire, Scotland). A prospective cohort is reported of consecutive IAAs treated by two senior surgeons from May to December 2006. One or more Anaconda limbs were used, and internal iliac arteries were emb...

Security is an important concern to improve in emerging cloud computing to store, manage, analyze and share the sensitive data. Infrastructure as a Service (IaaS) is a provision cloud model attracting all business customers to use cloud by offering on-demand and pay-per-use hardware, storage, servers and other networking components. Present single cloud architectures are having numerous securit...