Nowadays, numerous journals and conferences have published articles related to context-aware systems, indicating many researchers' interest. Therefore, the goal of this paper is to review the works that were published in journals, suggest a new classification framework of context-aware systems, and explore each feature of classification framework. This paper is based on a literature review of context-aware systems from 2000 to 2007 using a keyword index and article title search. The classification framework is developed based on the architecture of context-aware systems, which consists of the following five layers: concept and research layer, network layer, middleware layer, application layer and user infrastructure layer. The articles are categorized based on the classification framework. This paper allows researchers to extract several lessons learned that are important for the implementation of context-aware systems.

Context-aware systems

Please provide a short abstract of 100 to 250 words. The abstract should not contain any undefined abbreviations or unspecified references. Work planned but not completed should not appear in the abstract.

User Modeling and User-Adapted Interaction

Part I: Basics - Knowledge Representation - Ontologies - Semantic Web - Model Driven Architecture - Modeling Spaces.- Part II: Model Driven Architecture and Ontologies - Software Engineering Approaches for Ontology Development - MDA-Based Ontology Infrastructure - Ontology Definition Metamodel - Ontology UML Profile - Mappings of MDA Based Languages and Ontologies.- Part III: Application - Using UML Tools for Ontology Modeling - MDA Based Ontology Platform: AIR - Ontology Examples.

Model Driven Architecture and Ontology Development

The use of different modeling languages in software development makes their integration a must. Most existing integration approaches are meta-model-based with these metamodels representing both an abstract syntax of the corresponding modeling language and also a data structure for storing models. This implementation specific focus, however, does not make explicit certain language concepts, which can complicate integration tasks. Hence, we propose a process which semi-automatically lifts metamodels into ontologies by making implicit concepts in the metamodel explicit in the ontology. Thus, a shift of focus from the implementation of a certain modeling language towards the explicit reification of the concepts covered by this language is made. This allows matching on a solely conceptual level, which helps to achieve better results in terms of mappings that can in turn be a basis for deriving implementation specific transformation code.

Lifting metamodels to ontologies : A step to the semantic integration of modeling languages

Authoring context sensitive, interactive multimedia presentations is much more complex than authoring either purely audiovisual applications or text Interactions among media objects need to be described as a set of spatio-temporal relationships that account for synchronous and asynchronous interactions, as well as on-demand linking behavior This article considers the issues that need to be addressed by an authoring environment We begin with a partitioning of concerns based on seven classes of authoring problems We then describe a selection of multimedia authoring environments within four different authoring paradigms: structured, timeline, graph and scripting We next provide observations and insights into the authoring process and argue that the structured paradigm provides the most useful framework for presentation authoring We close with an example application of the structured multimedia authoring paradigm in the context of our own structure-based system GRiNS

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Structured multimedia authoring

The perspective role of UML as a conceptual modelling language for the Semantic Web has become an important research topic. We argue that UML could be a key technology for overcoming the ontology development bottleneck thanks to its wide acceptance and sophisticated tool support. Transformational approaches are a promising way of establishing a connection between UML and web-based ontology languages. We compare some proposals for defining transformations between UML and web ontology languages and discuss the different ways they handle the conceptual differences between these languages. We identify commonalities and differences of the approaches and point out open questions that have not or not satisfyingly been addressed by existing approaches.

/pdf/uml-for-the-semantic-web-transformation-based-approaches-50utvnur68.pdf

UML for the Semantic Web: Transformation-Based Approaches.

This paper presents an approach to assist authors during the authoring of multimedia presentations. We extend the existing authoring support by integrating processes of topic identification, content collection and discourse structure building in a single environment. This integration allows identification of the context of the authoring process. Our approach combines this process context awareness with explicit domain and discourse knowledge to steer system suggestions. We evaluate our approach with an experimental system prototype.

/pdf/context-aware-guidance-for-multimedia-authoring-harmonizing-3p9zrbltqz.pdf

Context aware guidance for multimedia authoring: harmonizing domain and discourse knowledge

This paper presents an approach to assist authors during the authoring of multimedia presentations. We extend existing authoring support by integrating processes of topic identification, content collection and discourse structure building in a single environment. This integration allows identification of the context of the authoring process. Our approach combines this process context awareness with explicit domain and discourse knowledge to steer system suggestions. We evaluate our approach with an experimental system prototype

This paper explores the interdependencies between userdetermined interaction in the authoring process of the complex multimedia presentation and the semantic descriptions of tasks and content that allow active system support for the user during the various process phases. The domain we have chosen is the one of the fine arts. The process phases in which we are particularly interested include events such as decision making about form and function, establishing the logical structure, material collection and selection. We introduce the design of an experimental framework for semi-automatic authoring, SampLe. This exploits large mediaaware semantic spaces through semantic-sensitive authoring methods to support users mainly during the early stages of presentation design. We discuss the relations between interactionbased interface design for the system and the underlying semantic structures.

http://interaction.ecs.soton.ac.uk/idsw04/idsw04_final/idsw04_papers/IDSW04_Falkovych.pdf

Semantic-based support for the semi-automatic construction of multimedia presentations

We address the problem of building a flexible discourse model that enables creation of relatively complex discourse structures by using a semantic framework and semantic descriptions of media items. With such a model we intend to support different approaches to hypermedia presentation authoring. We give a short overview of existing hypermedia presentation generation systems and discuss what type of authoring they support. We present our motivation for working towards a discourse model that improves on existing approaches. We describe in more detail our experiences with various strategies for building discourse structures for DISC and SampLe systems. Based on these experiences we come up with a set of requirements for a common discourse model.

/pdf/creating-a-semantic-based-discourse-model-for-hypermedia-384zk3s90g.pdf

Kateryna Falkovych

Papers

UML for the Semantic Web: Transformation-Based Approaches.

Context aware guidance for multimedia authoring: harmonizing domain and discourse knowledge

Context aware guidance for multimedia authoring: harmonizing domain and discourse knowledge

Semantic-based support for the semi-automatic construction of multimedia presentations

Creating a Semantic-based Discourse Model for Hypermedia Presentations: (Un)discovered Problems