Karthikeyan Ponnalagu

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SOA-based solutions are typically modeled as business processes composed of loosely coupled services. Such an approach promises the flexibility to more easily customize the solution functionality in line with constantly changing customer requirements. The research issue that we address in this paper, therefore, is how to best accomplish this customization.(More)
Existing web service composition and adaptation mechanisms are limited only to the scope of web service choreography in terms of web service selection/invocation vis-à-vis prespecified Service Level Agreement constraints. Such a scope hardly leaves ground for a participating service in a choreographed flow to re-adjust itself in terms of changed non(More)
Software service organizations typically tend to develop custom solutions upon entry to a project engagement. This is not a scalable proposition. Today, driven by the need for enhancing profitability, reuse of existing assets across customer engagements is a more viable strategy. This is leading to the transformation of software services organizations from(More)
Organizations adopting service oriented architecture can derive higher business value only if the functionality provided by existing systems is reused. "Servicising" existing systems (locating and exposing available functionality as a set of service based operations), is an efficient way forward, to the evolution of existing systems to SOA. To facilitate(More)
Typically in collaborative cloud systems, the collaborations are formed based on pre-negotiated terms and conditions. Care is taken to ensure that the resources are planned in such a way so as to satisfy the SLA requirements. However, these static collaborations pose certain challenges in the long run, which arise due to the changes in quality of resources(More)
In multi-tenant collaborative cloud systems, the choice of cloud providers is based on pre-negotiated terms and conditions to help meet Service Level Agreements (SLAs) and streamline resource provisioning. However, these collaborations are not self-adaptive to accommodate changes in tenancy requirements, quality of resources and provider capabilities as(More)