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The elastic provisioning of Virtual Infrastructures (VIs) enables a dynamic management of cloud resources (computing and communication) in order to meet the hosted application's requirements. Thus, to perform elasticity requests, providers usually rely on reallocation mechanisms and policies. The concerns regarding the environment and the operational costs indicate energy consumption of the data centers...
With the incredible growth of OSNs (online social networks), users have numerous choices every moment. However, due to the limit of time and resources, only a small part of OSNs are chosen to remain social and active by users. The dynamic changes of users' interests entail user migration. Understanding user migration behavior is important to improve business intelligence and retain users. In this...
The feasibility of large-scale decentralized networks for local computations, as an alternative to big data systems that are often privacy-intrusive, expensive and serve exclusively corporate interests, is usually questioned by network dynamics such as node leaves, failures and rejoins in the network. This is especially the case when decentralized computations performed in a network, such as the estimation...
On-demand computing, Software-as-a-Service, Platform-as-a-Service, and in general Cloud Computing is currently the main approach by which both academic and commercial domains are delivering systems and content. Nevertheless there still remains a huge segment of legacy systems and application ranging from accounting and management information systems to scientific software based on classic desktop...
In clusters of servers like cloud computing systems, computation resources like CPUs and storages are virtualized. Virtual machines are now widely used to support applications with virtual computation service on computation resources. Application processes are performed on virtual machines independently of which servers of which architectures are used. Furthermore, a virtual machine can migrate from...
Cloud computing is the much sought after technology as it solves large computational problems by using various resources and also offers many other services through the internet. The computational offloading and the increased demand for timely and appropriate response for real time applications has resulted in the need to improve the performance of the cloud. In addition to this, the tremendous growth...
The advances in cloud computing have presented the global vision of utility computing with promising trends to a new world of information and communication technology. The legacy systems built on the obsolete and older technologies are typically addressed for the modification and alteration processed to leverage the benefits of cloud. Migrating to the cloud deployment models and re-engineering the...
Changing the development environment can have severe impacts on the system behavior such as the execution-time performance. Since it can be costly to migrate a software application, engineers would like to predict the performance parameters of the application under the new environment with as little effort as possible. In this paper, we concentrate on model-driven development and provide a methodology...
Scalable and fault-tolerant information systems like cloud systems are realized in server cluster systems. Server cluster systems are equipped with virtual machines to provide applications with scalable and fault-tolerant services. Scalable and fault-tolerant application services can be provided by balancing processing load among virtual machines to perform application processes. On the other hand,...
Cloud computing has expressed the global vision of utility computing with promising trends to a new world of information and communication technology. The transformation of the already existing systems into new ones compatible with target cloud computing framework is one of the most important cloud computing issues. Reengineering and migration are the popular and efficient approaches to be deployed...
Cloud computing is offering utility oriented IT services to users worldwide. Based on a pay per use model, it provides a variety of computing resources, enterprise applications while enabling their hosting from consumer, scientific and business domains through a three layered architecture and different cloud types. The proliferation of cloud computing has resulted in the establishment of large-scale...
There are often low-level migration policies that are enforced by the platform providers to reduce the cost associated with the consumption of energy. There are also high-level policies produced by the enterprises that own the virtual machines. For example, enterprises can impose location-oriented policies to stop the execution of tasks in a given country. The policies can also be aimed at boosting...
In Model-Driven Engineering, analogously to any software artifact, metamodels are equally prone to evolution. When a metamodel undergoes modifications, all the related artifacts must be accordingly adapted in order to remain valid. Manual co-evolution of models after these metamodel changes is error-prone. In this setting, this paper introduces a semi-automatic process for the co-evolution of models...
Based on two-way wave equation, prestack reverse time migration (RTM) overcomes dip limitation, and can image complicated geological body with high precision. However, since the massy storage, large amount of computation, low frequency noise, the industrialization process of this approach develops slowly. High order finite difference algorithm is used to calculate reverse time migration in the paper...
In recent years, cloud computing has emerged as an enabling technology, in which virtual machine migration and dynamic resource allocation is one of the hot issues. During the migration of virtual machine, access requests from end users coming constantly. So how to schedule these requests to ensure the performance of cloud storage system is the key issue. In this paper, we focus on scheduling access...
Nowadays, multi-agent techniques are widely used in developing scalable and flexible software applications. Distributed simulation based on multi-agent system is very useful due to the inherent property of scalability and autonomy of agent system. Load balancing is an important issue in distributed simulation which distributes the jobs among the PCs so as to balance the load. This paper proposes a...
Cloud data centers and virtualization are being highly considered for enterprises and industries. However, elastic fine-grained resource provision while ensuring performance and SLA guarantees for applications requires careful consideration of important and extremely challenging tradeoffs. In this paper, we present RPPS (Cloud Resource Prediction and Provisioning scheme), a scheme that automatically...
A meta-model comprising knowledge(K), objectives(Q), resource(R) and locations(L) is proposed as habitat of a person. The model is used for scheduling of person activities to achieve its goal. The activities mainly include knowledge acquisition, resource generation and migration. And the model can also be used to reason on minimal requirements of a person, testing achievement of a goal and deciding...
Cloud Computing is seeing an increasing attention and this will drive business to build new application and also drive the migration of existing on-premise applications onto cloud. As part of a real work experience, a Unified Cloud Migration Framework has been defined with a factory based approach to drive the application development on cloud. This can be certainly treated as a systematic approach...
In cloud computing era, datacenter can be organized by resources distributed geographically on demand into a dynamic logical entity. All these virtualized datacenters (VDCs) migrate transparently to another resources set for the best cost-effectiveness. Open storage architecture is one of the basic infrastructures in Cloud. This paper introduces a scheduling model of access request in open storage...
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