Mobile devices such as personal digital assistants (PDAs) and mobile phones are in widespread use already today and converging to mobile smart phones. They enable the users to access a wide range of services and information without guiding them through their actual demands. Especially during mass events like the Olympic Games 2008 in Beijing -which was initially the context of our work -a large service space is expected to support all mobile visitors, being athletes, journalists, or spectators.Current approaches tackling such problems are location-based (i.e., location-based services), meaning that a user's location is taken into consideration for service provision, and even contextaware, meaning that beyond location other characteristics of a user's environment are taken into account. Such information obviously helps to deliver relevant information at the right time to the mobile users. Going one step further, a situation-aware system abstracts from the context dimensions by translating specific contexts into logical situations (such as being in the car, in a stadium). Even though many context frameworks have been introduced in the past few years, what is usually missing is the notion of characteristic features of contexts which are invariant during certain time intervals. We refer to such features as situations. Knowing the situation end users are in allows the system to better target the information to be delivered to them. This paper presents the main concepts developed for a platform named FLAME2008, which is able to support its mobile users with personalized situation-aware services in push and pull mode.
The paper presents a service composition language called VINCA, which differs from many existing ones in its emphasis on enabling business users to visually "program" from business view-point their personalized applications on the basis of Web-based services. VINCA embodies an integrated approach to mediating between diverse, rapidly changing user requirements and composites of individual services scattered over the Internet. The approach is targeted at application scenarios that require Web-based services be quickly assembled by non-computer professionals to fulfill certain spontaneous requirements. VINCA is developed within a real-world project for developing a service mediation platform for the Olympic Games Beijing 2008, on which an effective information system providing personalized and one-stop information services to the general public, should be based. In this paper, we introduce the main features and design rationales of VINCA with a scenario, and also discuss its implementation and application.
Mobile devices such as personal digital assistants (PDAs) and mobile phones are in widespread use already today and converging to mobile smart phones. They enable users to access a wide range of services and information without guidance through their actual demands. Especially during mass events like the Olympic Games 2008 in BeijingVwhich was initially the context of our workVa large service space is expected to support all mobile visitors, being athletes, journalists, or spectators. Current approaches tackling such problems are location based, meaning that a user's location is central to service provision, and even context-aware, meaning that, beyond location, characteristics of a user's environment are taken into account. Such information obviously helps to deliver relevant information at the right time to the mobile users. Going one step further, a situation-aware system abstracts from the context dimensions by translating specific contexts into logical situations. Knowing the situation end users are in allows the system to better identify the information to be delivered to them and to choose the appropriate services with regard to their scope, which is referred to as service roaming. Even though many context frameworks have been introduced in the past few years, what is usually missing is the notion of characteristic features of contexts that are invariant during certain time intervals. This paper presents these concepts in the context of a platform development, namely FLAME2008, which is able to support its mobile users with personalized situation-aware services in push and pull mode.
The evolution of wireless network technology has led to an increasing number of applications for mobile use. In addition, the paradigm of service-oriented architectures allows a composition of applications based on distributed web services. By using registries it becomes possible to choose the appropriate services at runtime. It needs to be considered that services for mobile use may have different scopes. For instance, routing or weather services may be dedicated to a specific region so that they may be useless if a users area of interest does not match the services scope. It is hence necessary to identify and use those services with a scope that corresponds to the relevant context such as a users location. Moreover, if the context changes, it is desirable to automatically switch between different equivalent service instances to provide a user with a continuous connection to a desired service. We denote this mechanism as service roaming. This paper presents the major concepts needed for service roaming as well as a roaming model based on n-dimensional context spaces
This paper presents an approach for enabling the commercial use of Geospatial Web Services in an on demand and ad-hoc fashion. The main goal is to go beyond classical Role-Based Access Control models in order to support ad-hoc license agreements directly in-process, without any prior offline negotiated agreements being necessary between georesource provider and geoprocessing user for on-demand access. Therefore, a general security and licensing architecture is defined as a transparent layer for Geospatial Web Services. In particular, this chapter focuses on state-of-the-art interface specifications from OGC and defines generic security extensions being applicable to all OGC standards based on OWS Common. The static model with trust relationships between the different components of the architecture in heterogeneous security domains as well the dynamic structure is studied. The presented ideas are verified by a proof-of-concept implementation following a real world scenario.
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