Nikolay Grozev

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Although Cloud computing itself has many open problems, researchers in the field have already made the leap to envision Inter-Cloud computing. Their goal is to achieve better overall Quality of Service (QoS), reliability and cost efficiency by utilizing multiple clouds. Inter-Cloud research is still in its infancy, and the body of knowledge in the area has(More)
Cloud data centers are becoming the preferred deployment environment for a wide range of business applications because they provide many benefits compared to private in-house infrastructure. However, the traditional approach of using a single cloud has several limitations in terms of availability, avoiding vendor lock-in, and providing legislation-compliant(More)
A significant number of Cloud applications follow the 3-tier architectural pattern. Many of them serve customers worldwide and must meet non-functional requirements such as reliability, responsiveness and Quality of Experience (QoE). Thus the flexibility and scalability offered by clouds make them a suitable deployment environment. Latest developments show(More)
Cloud data centres have become the preferred hosting environment for large-scale web-facing applications. They allow unprecedented scalability in response to a dynamic and unpredictable workload. However, many applications need to scale beyond the boundaries of a single data centre to multiple geographically dispersed clouds sites (i.e. a Multi-Cloud) to(More)
The paper presents our approach to the systematic and tool-supported source code measurement for quality analysis. First, we describe the results of the performed thorough study about the use of some static measurement tools. We classify them as reporting and combining and manage to elucidate the main requirements for a feasible framework, supporting a set(More)
Autoscaling is a hallmark of cloud computing as it allows flexible just-intime allocation and release of computational resources in response to dynamic and often unpredictable workloads. This is especially important for web applications whose workload is time dependent and prone to flash crowds. Most of them follow the 3-tier architectural pattern, and are(More)
Cloud computing facilitates flexible on-demand provisioning of IT resources over the Internet. It has proven to be very advantageous for a wide range of industries in the emerging markets by allowing them to match the infrastructure capabilities of their already established competitors. However, Cloud computing also poses several unique challenges in terms(More)
Cloud computing is a model of acquiring and using preconfigured IT resources on demand. Cloud providers build and maintain large data centres and lease their resources to customers in a pay-as-you-go manner. This enables organisations to focus on their core lines of business instead of building and managing in-house infrastructure. Such inhouse IT(More)
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