Abstract. Use of web services also on mobile devices becomes increasingly relevant. However, realizing such mobile web services based on the standard protocol stack is often inappropriate for resource-restricted mobile devices in dynamic networks. On the other hand, using specialized alternative protocols restricts compatibility with traditional service applications. Thus, existing approaches often do not allow to integrate heterogeneous service instances dynamically, as it is, e.g., required for executing mobile service-based business processes. In order to adequately support such more complex and dynamic applications, this paper presents a lean and flexible system architecture which supports both mobile web service consumers and providers by allowing to integrate multiple protocols depending on their capabilities and to dynamically access suitable service instances at runtime. As a proof of concept, the paper shows an exemplary combination of practically relevant protocols for resource-limited devices based on WSDL, ASN.1 and overlay transport and presents its integration in a prototype scenario for supporting decentralized mobile business processes.
Abstract. Context-aware applications and middleware platforms are evolving into major driving factors for pervasive systems. The ability to also make accurate assumptions about future contexts further enables such systems to proactively adapt to upcoming situations. However, the provision of a reusable system component to facilitate the development of such future-context-aware applications is still challenging -as it requires to be generic but, at the same time, as efficient and accurate as possible.To address these requirements, this paper presents the approach of Structured Context Prediction which constitutes a framework to facilitate the application of existing prediction methods. It allows application developers to integrate domain-specific knowledge by creating a customized prediction model at design time and to select, implement and combine prediction methods for the intended purpose. Feasibility is evaluated by applying a prototype system component to two mobile application scenarios, showing that both high accuracy and efficiency are possible.
Abstract. Mobile devices are increasingly aware of their respective locations and vicinity and tend to communicate rather loosely with each other; therefore asynchronous communication paradigms are used predominately so far for corresponding mobile applications. However, while such communication mechanisms are suitable for simple activities, they may become insufficient for more complex tasks which consist of longer sequences of related activities tied together in application-oriented processes. This is of particular importance if the resulting operating sequence spans several mobile devices in frequently changing vicinities. Therefore, the work presented here provides a concept for integrating explicit support for such mobile processes into mobile system infrastructures and for distributing their execution over different nodes in the network. For this purpose, a corresponding middleware platform (extension) for context-aware mobile applications is proposed. It supports such migrating processes and helps to execute them under the restrictions typically imposed by realistic mobile applications. In particular, this paper proposes a corresponding process description language and an execution model for mobile and distributed (business) processes in the context of the project DEMAC (Distributed Environment for Mobility-Aware Computing).
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