6 research outputs found
Broker-based service-oriented content adaptation framework
Electronic documents are becoming increasingly rich in content and varied in format
and structure. At the same time, user preferences vary towards the contents and their
devices are getting increasingly varied in capabilities. This mismatch between rich
contents and user preferences along with the end device capability presents a challenge
in providing ubiquitous access to these contents. Content adaptation is primarily used to
bridge the mismatch by providing users with contents that is tailored to the given
contexts e.g., device capability, preferences, or network bandwidth. Existing content
adaptation systems employing these approaches such as client-side, server-side or
proxy-side adaptation, operate in isolation, often encounter limited adaptation
functionality, get overload if too many concurrent users and open to single point of
failure, thus limiting the scope and scale of their services. To move beyond these
shortcomings, this thesis establishes the basis for developing content adaptation
solutions that are efficient and scalable. It presents a framework to enable content
adaptation to be consumed as Web services provided by third-party service providers,
which is termed as “service-oriented content adaptation”. Towards this perspective, this
thesis addresses five key issues – how to enable content adaptation as services (serviceoriented
framework);
how
to
locate
services
in
the
network
(service
discovery
protocol);
how
to select best possible services (path determination); how to provide quality
assurance (service level agreement (SLA) framework); and how to negotiate quality of
service (QoS negotiation). Specifically, we have: (i) identified the key research
challenges for service-oriented content adaptation, along with a systematic
understanding of the content adaptation research spectrum, captured in a taxonomy of
content adaptation systems; (ii) developed an architectural framework that provides the
basis for enabling content adaptation as Web services, providing the facilities to serve
clients’ content adaptation requests through the client-side brokering; (iii) developed a
service discovery protocol, by taking into account the searching space, searching time,
match type of the services and physical location of the service providers; (iv) developed
a mechanism to choose the best possible combination of services to serve a given
content adaptation request, considering QoS levels offered; (v) developed an
architectural framework that provides the basis for managing quality through the
conceptualization of service level agreement; and (vi) introduced a strategy for QoS
negotiation between multiple brokers and service providers, by taking into account the
incoming requests and server utilization and, thus requiring the basis of determining
serving priority and negotiating new QoS levels. The performance of the proposed
solutions are compared with other competitive solutions and shown to be substantially
better
Location-aware scalable service composition.
The problem of service composition is the process of assigning resources to services from a pool of available ones in the shortest possible time so that the overall quality of service is maximized. This article provides solutions for the composition problem that takes into account its scalability, services’ locations, and users’ restrictions, which are key for the management of applications using state-of-the-art technologies. The provided solutions use different techniques, including genetic algorithms and heuristics. We provide an extensive experimental evaluation, which shows the pros and cons of each of them, and allows us to characterize the preferred option for each specific problem. Since no solution dominates the others, we propose a decision tree, based on our results, to select the best composition algorithm in each situation.Spanish Government projects TED2021-130666B-I00 and PID2021-125527NB-I00.
Funding for open access charge: Universidad de Málaga / CBUA
Wedding planner in a box
Marriage describes the connection of two souls who promise to become one heart. Everyone dreams their marriage to be nearly perfect and that will happen only if they are able to make their wedding plan with best packages. In this busy world, many couples delay their wedding mainly because of high budget required to meet their dream wedding ceremony. Wedding ceremony requires careful and meticulous planning from many aspects such as choosing the food, make up, decoration, and gifts
Semantics-aware planning methodology for automatic web service composition
Service-Oriented Computing (SOC) has been a major research topic in the past years. It is based on the idea of composing distributed applications even in heterogeneous environments by discovering and invoking network-available Web Services to accomplish some complex tasks when no existing service can satisfy the user request. Service-Oriented Architecture (SOA) is a key design principle to facilitate building of these autonomous, platform-independent Web Services. However, in distributed environments, the use of services without considering their underlying semantics, either functional semantics or quality guarantees can negatively affect a composition process by raising intermittent failures or leading to slow performance. More recently, Artificial Intelligence (AI) Planning technologies have been exploited to facilitate the automated composition. But most of the AI planning based algorithms do not scale well when the number of Web Services increases, and there is no guarantee that a solution for a composition problem will be found even if it exists. AI Planning Graph tries to address various limitations in traditional AI planning by providing a unique search space in a directed layered graph. However, the existing AI Planning Graph algorithm only focuses on finding complete solutions without taking account of other services which are not achieving the goals. It will result in the failure of creating such a graph in the case that many services are available, despite most of them being irrelevant to the goals. This dissertation puts forward a concept of building a more intelligent planning mechanism which should be a combination of semantics-aware service selection and a goal-directed planning algorithm. Based on this concept, a new planning system so-called Semantics Enhanced web service Mining (SEwsMining) has been developed. Semantic-aware service selection is achieved by calculating on-demand multi-attributes semantics similarity based on semantic annotations (QWSMO-Lite). The planning algorithm is a substantial revision of the AI GraphPlan algorithm. To reduce the size of planning graph, a bi-directional planning strategy has been developed
Methods for Efficient and Accurate Discovery of Services
With an increasing number of services developed and offered in an enterprise setting or the Web, users can hardly verify their requirements manually in order to find appropriate services. In this thesis, we develop a method to discover semantically described services. We exploit comprehensive service and request descriptions such that a wide variety of use cases can be supported. In our discovery method, we compute the matchmaking decision by employing an efficient model checking technique