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1.
  • Abramowicz, Konrad, et al. (creator_code:aut_t)
  • Multivariate piecewise linear interpolation of a random field
  • 2011
  • swepub:Mat_publicationother_t (swepub:level_scientificother_t)abstract
    • We consider a multivariate piecewise linear interpolation of a continuous random field on a-dimensional cube. The approximation performance is measured by the integrated mean square error. Multivariate piecewise linear interpolator is defined by N field observations on a locations grid (or design). We investigate the class of locally stationary random fields whose local behavior is like a fractional Brownian field in mean square sense and find the asymptotic approximation accuracy for a sequence of designs for large N. Moreover, for certain classes of continuous and continuously differentiable fields we provide the upper bound for the approximation accuracy in the uniform mean square norm.
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2.
  • Arvidsson, Viktor, 1984- (creator_code:aut_t)
  • Towards efficient and effective E-Service Delivery : Addressing the matter of intricacy in service evaluation
  • 2011
  • swepub:Mat_publicationother_t (swepub:level_scientificother_t)abstract
    • The great promises of e-government have proven to be harder than expected to realise. Effective and efficient e-service delivery is dependent on making sound choices as to which e- services to implement; consequently, accountability in the use of ICT-resources have become of increasing importance. This generates a need to identify what constitutes a suitable e-service, and to devise models capable of evaluating available options. As public services reach beyond the business rationale of the private sector, such considerations must deal with the complexity of public value. Additionally, due to the heterogeneous nature of local government it is not feasible to evaluate every candidate in depth. For e-service delivery to reach beyond major services governments must lower their demands for accuracy and implement more cost- efficient ways of estimating public value. This paper investigates how this can be achieved while maintaining satisfactory results, and builds an understanding of the challenges that local governments face in doing so. 
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  • Breitgand, D., et al. (creator_code:aut_t)
  • Policy-Driven Service Placement Optimization in Federated Clouds
  • 2011
  • swepub:Mat_publicationother_t (swepub:level_scientificother_t)abstract
    • Efficient provisioning of elastic services constitutes a significant management challenge for cloud computing providers. We consider a federated cloud paradigm, where one cloud can subcontract workloads to partnering clouds to meet peaks in demand without costly over-provisioning. We propose a model for service placement in federated clouds to maximize profit while protecting Quality of Service (QoS) as specified in the Service Level Agreements (SLA) of the workloads. Our contributions include an Integer Linear Program (ILP) formulation of the generalized federated placement problem and application of this problem to load balancing and consolidation within a cloud, as well as for cost minimization for remote placement in partnering clouds. We also provide a 2-approximation algorithm based on a greedy rounding of a Linear Program (LP) relaxation of the problem. We implement our proposed approach in the context of the RESERVOIR architecture.
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8.
  • Edlund, Lars-Erik, 1953- (creator_code:aut_t)
  • Svenska dialekter
  • 2010
  • swepub:Mat_publicationother_t (swepub:level_popularscientific_t)
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10.
  • Elmroth, Erik, 1964-, et al. (creator_code:aut_t)
  • A composable service-oriented architecture for middleware-independent and interoperable grid job management
  • 2010
  • swepub:Mat_publicationother_t (swepub:level_scientificother_t)abstract
    • We propose a composable, loosely coupled Service-Oriented Architecture for middleware-independent Grid job management. The architecture is designed for use in federated Grid environments and aims to decouple Grid appli- cations from Grid middlewares and other infrastructure components. The notion of an ecosystem of Grid infrastructure components is extended, and Grid job management software design is discussed in this context. Non- intrusive integration models and abstraction of Grid middleware function- ality through hierarchical aggregation of autonomous Grid job management services are emphasized, and service composition techniques facilitating this process are explored. Earlier efforts in Service-Oriented Architecture design are extended upon, and implications of these are discussed throughout the paper. A proof-of-concept implementation of the proposed architecture is presented along with a technical evaluation of the performance of the proto- type, and a details of architecture implementation are discussed along with trade-offs introduced by the service composition techniques used.
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Persson, M (2)
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