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The increasing number of services available on the Web requires sophisticated mechanisms for the matchmaking, selection and composition of services based on business criteria. Such mechanisms require descriptions that address business terms, but existing approaches for the modeling of service properties are inadequate for expressing business conditions. In this paper, we propose a novel Service Description...
Non-Functional (NF) requirement is very important for the success of a software service. Considering that there could be multiple services implementing a same function, it is crucial for software providers to understand the real NF demands from consumers so that they can meet these demands and attract users. It is also crucial for consumers to know what is being offered so that they can pose realistic...
Dynamic service composition in wireless environment provides us with a promising approach to build complex applications based on the basic value-added services. In different network domains, multiple services may provide data with different security levels. In order to prevent from information leakage, information flow security is a major concern in composite services. However, the energy-limited...
The idea to build systems based on services, by reusing and combining software made available independently via different technologies and channels and dynamically organizing them into coherent processes, has a very well recognized potential. Achieving this potential stands crucially on the ability to recognize and exploit the context in which such applications operate, in terms of the available services,...
The accurate description of service semantics plays a crucial role in service discovery, composition and interaction. Most work in this area has been focussed on ontological descriptions, which are searchable and machine-understandable, but do not define service functionality in a verifiable and testable way. Formal specification techniques, having evolved over the past 30 years, can define semantics...
This paper presents a short survey on the quality evaluation of web services. The most popular metrics for estimating such quality and user perception of web services are Quality of Service (QoS) and Quality of Experience (QoE), which represent objective and subjective assessments correspondingly. For different types of web services, the values of QoS and QoE are measured in different ways. In this...
We examine the lifecycle requirements of intermittently connected web-applications (ICWAs) and investigate whether such applications can be developed as an "always connected" web-application combined with middleware that address ICWA requirements. We show that this is difficult to do because ICWAs require application-specific logic that is not easily combined with a middleware API. We therefore...
Service-oriented workflows are typically executed using a centralised orchestration approach that presents significant scalability challenges. These challenges include the consumption of network bandwidth, degradation of performance, and single-points of failure. We provide a decentralised orchestration architecture that attempts to address these challenges. Our architecture adopts a design model...
The emergence of Web services has changed the Internet a lot, and greatly facilitated the development of service based software systems. How to select appropriate services and compose them according to given context to satisfy a user's requirement is a big challenge. This paper proposes a novel Genetic Algorithm (GA) method to synthesis web services in a context-aware environment. We first present...
In a composite service for multiple users, users that locate in the different network position are related to network parameters that change dynamically. Therefore, we need a service composition method that can not only handle many user requests, but also adapt to the change of the current network parameters. We use queuing theory and reliability theory to model services, and propose a runtime service...
Most approaches for Web service compositions focus on the technical level as they specify "how-to" achieve the composition instead of providing casual users with means to express "what-to" achieve their business objectives. This new mindset requires extending Web services with the concept of capability, which describes what a service can do to reduce the gap between Web services...
Semantic web service discovery has attracted a lot of attention in the last decade. Research conducted in this area can be (mainly) summarized as follows: (1) "monolith" matchmaking algorithms (and systems), and (2) schema matching-based techniques. In this paper we describe a flexible approach that takes leverage of existing schema matchers, leading to a multiple choice strategy for semantic...
One of the main ideas of Service-Oriented Computing (SOC) is the delivery of flexibly composable services provided on world-wide markets. For a successful service discovery, service requests have to be matched with the available service offers. However, in a situation in which no service that completely matches the request can be discovered, the customer may tolerate slight discrepancies between request...
As an emerging interdisciplinary subject which crosscuts business modeling, knowledge management and economic analysis, service engineering is increasingly demanded to take care of various stakeholders' proting goals of the short run vs. long run. We propose to work towards a value driven design based solution through introducing a form of service design patterns: the service value broker(SVB) patterns...
This article proposes a new architectural principle for LISA (LInked Service Architecture) based on the Linked Data, ROA (Resource-Oriented Architecture), and meta-level service broker. LISA employs a two-layer architecture separating the concerns into meta-level of linking and base level of provisioning of services. A meta-level broker can dynamically coordinate services, and make the provisioning...
In this paper we investigate the problem of providing consistency, availability and durability for Web Service-transactions. We consider each transaction as a black box, with only the corresponding metadata, expressed as UML specifications, as transaction semantics. We refer to these WStransactions as coarse-grained WS-transactions. We propose an approach that guarantees the availability of the popular...
Since current heterogeneous Intrusion Detection Systems (IDSs) have not been designed to work in a cooperative manner, sharing security information among them poses a serious challenge especially in large-scale High Speed Networks (HSN) environment. The integration become more difficult when we should reduce computing and memory costs incurred by the high speed IDSs communication. Fortunately Web...
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