Service Oriented Computing

Value generation in e-government from service-based IT integration

by Francesco Virili

Engineering of Trustworthy Smart Grids Implementing Service Level Agreements

by Rune Gustavsson

In Proceedings of the 15th International Conference on Intelligent System Applications in Power Systems (ISAP 2011), September 25 - 28, Crete, Greece.

In the paper we address issues related to design and implementation of future Smart grids. System uptake and... more In the paper we address issues related to design and implementation of future Smart grids. System uptake and acceptance will to a large extent depend on the perceived trust by different stakeholders of these systems. To support engineering of those kinds of complex systems we propose models based on Interoperability. A key issue is here interoperability of information exchange and sharing. Based on analysis of trust concerns by stakeholders, we propose a model of coordination and monitoring based on Service Level Agrrements (SLAs) between stakeholders.

An environment for evaluation and testing of service workflow schedulers in clouds

by Luiz B

HPCS 2011

Workflows built through service composition bring new challenges, making the scheduling task even more com- plex.... more Workflows built through service composition bring new challenges, making the scheduling task even more com- plex. Besides that, scheduling researchers need a wide range of workflows and their respective services to vali- date new achievements. In this paper we present a service oriented testbed where experiments can be conducted to de- velop and evaluate algorithms, heuristics, and scheduling policies for workflows. Our testbed offers an emulator ser- vice which allows the workflow characterization through the description of its services. With this, researchers can build workflows which have similar behavior to the real workflow applications, emulating them without the need of implementing all applications and services involved in a real application execution. To demonstrate the utilization of both the testbed and emulator, we conducted workflow executions emulating service workflow applications, such as Montage and LIGO.

Enabling execution of service workflows in grid/cloud hybrid systems

by Luiz B

Cloudman 2010 / NOMS Workshops

Cloud computing systems provide on demand access to computational resources for dedicated use. Grid computing allows... more Cloud computing systems provide on demand access to computational resources for dedicated use. Grid computing allows users to share heterogeneous resources from multiple administrative domains applied to common tasks. In this paper we discuss the characteristics and requirements of a hybrid system composed of both grid and cloud technologies. We propose an infrastructure which is able to manage the execution of service workflows in such system. We show how the infrastructure can be expanded by acquiring computational resources on demand from the cloud during the workflow execution, and how it manages these resources and the workflow execution without user interference.

Performance evaluation of virtual machines in a service-oriented Grid testbed

by Luiz B

Bicriteria service scheduling with dynamic instantiation for workflow execution on grids

by Luiz B

The 4th International Conference on Grid and Pervasive Computing / LNCS

Nowadays the grid is turning into a service-oriented environment. In this context, there exist solutions to the... more Nowadays the grid is turning into a service-oriented environment. In this context, there exist solutions to the execution of workflows and most of them are web-service based. Additionally, services are considered to exist on a fixed host, limiting the resource alternatives when scheduling the workflow tasks. In this paper we address the problem of dynamic instantiation of grid services to schedule workflow applications. We propose an algorithm to select the best resources available to execute each task of the workflow on the already instantiated services or on services dynamically instantiated when necessary. The algorithm relies on the existence of a grid infrastructure which could provide dynamic service instantiation. Simulation results show that the scheduling algorithm associated with the dynamic service instantiation can bring more efficient workflow execution on the grid.

Execution of service workflows in grid environments

by Luiz B

Imaging Services on the Grid as a Product Line: Requirements and Architecture

by Mathieu Acher

Cognitive Service-Oriented Infrastructures

by Fabrizio Granelli

A distributed infrastructure for monitoring network resources

by Augusto Ciuffoletti

A revised version of this paper is in "Horizons in Computer Science Research" vol 7, Nova Publishing, ISBN 978-1-61942-774-7.

The capability of dynamically monitoring network performance is one of the emerging requirements for a Grid. In fact,... more The capability of dynamically monitoring network performance is one of the emerging requirements for a Grid. In fact, network-aware applications, like complex Grid workflows, take advantage of real-time network performance measurements to obtain fault tolerance and performance optimization. We claim that such a capability is in fact orthogonal to the collection of data for scheduling and diagnosis, extensively considered in the literature, which needs large storage and indexing capabilities, but may disregard real-time performance issues.

We describe a network monitoring infrastructure specifically designed for demand driven, end-to-end monitoring, named gd2, which offers a Service Oriented interface to workflow management processes. We evaluate the footprint of the infrastructure, and discuss scalability and security issues. Performance figures are obtained from an experimental deployment of the prototype, implemented in the framework of
of the CoreGRID European project.

A Systematic Meta-analytic Review on Factors Influencing the Strategic Alignment in Service-Oriented Architecture Projects

by Patrick Mikalef

Mikalef, P. & Pateli, A. (2011) A Systematic Meta-analytic Review on Factors Influencing the Strategic Alignment in Service-Oriented Architecture Projects. 6thMediterranean Conference on Information Systems, MCIS 2011, 3-5 September, Limassol, Cyprus.

With an increasing amount of companies engaging the Service-Oriented Architecture (SOA) paradigm, there has been a... more With an increasing amount of companies engaging the Service-Oriented Architecture (SOA) paradigm, there has been a focus of attention on the business value which such projects may offer. Research in this direction however has been lagging, with studies focusing in their majority on technology-oriented aspects of SOA. This paper attempts to aggregate findings on factors that enable strategic alignment and observations that have been found to positively impact the business value of SOA projects. Our analysis is based on a meta-study of relevant academic literature Findings suggest that unlike traditional Information Technology (IT) projects, SOA implementations require focus on three additional domains; an appropriate Infrastructure to support the development and deployment of SOA projects, an explicitly defined SOA Governance plan, as well as the Organizational Culture to support it. With the aid of a focus group consisting of nine expert domains, we then categorize the above factors into the following four levels of alignment; organizational, project, individual/cognitive and system.

Parallel web service composition in moscoe: A choreography-based approach

by Vasant Honavar

Overview of Service Oriented Architecture for Resource Management in P2P System

by Salman Khwaja

The P2P computing is one of the technologies that is having a significant impact on the way Internetscale systems are... more The P2P computing is one of the technologies that is having a significant impact on the way Internetscale systems are built. It is well established for applications such as file sharing and parallel distributed computation. The well establishment for P2P systems is built on the notion of sharing. One of the objectives of resource sharing is to increase some measure of the overall work done by the collection of resources. The authors present a service oriented architecture for sharing and managing resources in P2P systems. As P2P services have shown expedient way of interaction between peers utilizing different services, our architecture will extend the high utilization of P2P networks with service orientation for handling more services with better management and easy extendibility to further capitalize on the success of P2P networks

Modeling event-driven service-oriented systems using the palladio component model

by Christoph Rathfelder

A framework for multi-level sla management

by Christoph Rathfelder

iSOAMM: an independent SOA maturity model

by Christoph Rathfelder

Comprehensive tool support for iterative SOA evolution

by Christoph Rathfelder

Model-based Management of Web Service Compositions in Service-Oriented Architectures

by Christoph Rathfelder

SOA Forschungsperspektiven und Werkzeugunterstützung

by Christoph Rathfelder

Towards robust service workflows: a decentralized approach

by Mario Henrique Cruz Torres

Presented at the 19th International Conference on Cooperative Information Systems (CoopIS), 19-21 October 2011, Crete, Greece

Nowadays service workflows are used to increase the efficiency of process oriented supply chains. Service workflows... more Nowadays service workflows are used to increase the efficiency of process oriented supply chains. Service workflows can encompass hundreds of services around a single process. These services are geographically spread and cross organizational boundaries. This raises the need for coordination, such as assigning tasks, synchronizing production schedules, between companies collaborating through services. We present a fully decentralized coordination mechanism that using each company's local knowledge, exposed as standard web-services, allows the enactment of robust processes in a supply chain. We evaluate our solution through simulations and show that it can create robust service compositions.