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2nd IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks

作者： Feeney, Kevin Lewis, David Argyroudis, Patroklos Nolan, Keith O'Sullivan, Declan Knowledge and Data Engineering Group (KDEG) Department of Computer Science and Statistics TCD Ireland CTVR Ireland Knowledge and Data Engineering Group Department of Computer Science and Statistics Ireland CTVR TCD Ireland

ISBN: (纸本)9781424406623

The management of dynamic spectrum access requires the coordination of administrative functions across multiple organizations, from regulators to secondary market operators and commons cooperatives. Policy-based management approaches to dynamic spectrum access must therefore support a wide range of organizational types and handle the relationships between policies authored separately within those organizations. A policy language for administering dynamic access to spectrum resources has been proposed by the DARPA XG initiative. This defines an expressive and extensible language for specifying policies that determine the correct behavior of RIF transceivers as spectrum usage opportunities occur. However, this language does not yet address the mapping of policies onto the complex organizational settings that are likely to emerge in the dynamic spectrum access domain. This paper defines how the DARPA XG policy language can be integrated with a meta-policy management scheme that provides the powerful organizational modeling and policy authoring authority control needed to manage the evolution of policies in these complex organizational settings. The benefits of this integration are illustrated through a case study based on the potential use of dynamic spectrum access licenses granted in Ireland for the DySpan 2007 conference, and the organizational conflicts that even this simple scenario can yield. The practical issues of administering a multi-organizational policy management system are examined through an analysis of the interactions between existing components that are being assembled to demonstrate sophisticated policy management of a cognitive radio system.

关键词： Abstracting

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Principles for Designing Activity-based Personalized eLearning

Principles for Designing Activity-based Personalized eLearni...

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International Conference on Advanced Learning Technologies (ICALT)

作者： Owen Conlan Ian O'Keeffe Aoife Brady Vincent Wade Knowledge and Data Engineering Group Department of Computer Science Trinity College Dublin Ireland

Activity-based personalized eLearning involves delivering to a learner a learning experience that is tailored to their individual needs. Traditionally, these needs have been met through the personalized selection of content that fits the learner's preferences. However, by coupling this approach with the possibilities of interactive services a more engaging form of personalized education may be realized. This paper describes the design principles for producing activity-based personalized distance learning offerings.

关键词： Electronic learning Web services computer aided instruction Adaptive systems Artificial intelligence data engineering computer science Educational institutions Navigation Automated highways

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OntoMove: A knowledge Based Framework for Semantic Requirement Profiling and Resource Acquisition

OntoMove: A Knowledge Based Framework for Semantic Requireme...

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Australian Conference on Software engineering

作者： Mehul Bhatt Wenny Rahayu Sury Prakash Soni Carlo Wouters Data Engineering and Knowledge Management Group Department of Computer Science La Trobe University Australia

The use of formal knowledge representation structures, or ontologies, has found immense applicability for the interoperability of software systems, e.g., alignment of software and business process models. Toward the management of such knowledge structures, an important foundational problem is that of ontology reuse - it is uncommon for new applications or for different components within one application to use an already available ontology in its entirety. Depending on component specific requirements, typical re-usages are restricted to refined versions of an existing ontology, with the refinement taking the form of a contraction of the knowledge contained therein. Furthermore, when the ontology is used to ascribe meaning to independently existing 'resources' (e.g., documents collections, source code, software manuals, process template repositories) by way of meta-data, there exists a direct mapping between different views/re-uses of an ontology and their respective semantic scopes within an annotated resource repository thereby leading to the concept of view/reuse dependent resource retrieval. We implement a framework that supports ontology reuse by way of a requirement driven sub-ontology extraction methodology. Additionally, based on this concept of a sub-ontology, we implement the idea of a user/component 'requirement profile' consisting of semantic descriptions of the user's interest within a 'resource repository' that has been annotated with semantic types from the ontology under consideration. A generic framework that implements these ideas and its application in the domains of medical information retrieval systems and business process management systems (BPMS) is presented.

关键词： Ontologies Application software Information retrieval Software engineering knowledge management knowledge representation data mining Resource management Software systems Semantic Web

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Organizing publications and bookmarks in BibSonomy

Organizing publications and bookmarks in BibSonomy

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Workshop on Social and Collaborative Construction of Structured knowledge, CKC 2007 - At the 16th International World Wide Web Conference, WWW 2007

作者： Jäschke, Robert Hotho, Andreas Schmitz, Christoph Grahl, Miranda Krause, Beate Stumme, Gerd Knowledge and Data Engineering Group Dept. of Mathematics and Computer Science Univ. of Kassel Wilhelmshöher Allee 73 D-34121 Kassel Germany Research Center L3S Univ. of Hannover Appelstr. 9a D-30167 Hannover Germany

BibSonomy is a web-based social resource sharing system which allows users to organise and share bookmarks and publications in a collaborative manner. Apart from standard folksonomy features such as an intuitive user interface, navigation along all dimensions, or browser integration via RSS feeds, BibSonomy provides tag hierarchies, group management and privacy features, and numerous import and export functions.

关键词： User interfaces

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Network properties of folksonomies

Network properties of folksonomies

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作者： Cattuto, Ciro Schmitz, Christoph Baldassarri, Andrea Servedio, Vito D.P. Loreto, Vittorio Hotho, Andreas Grahl, Miranda Stumme, Gerd Knowledge and Data Engineering Group Dept. of Mathematics and Computer Science Univ. of Kassel Wilhelmshöher Allee 73 D-34121 Kassel Germany Dipartimento di Fisica Università di Roma La Sapienza P. le A. Moro 2 I-00185 Roma Italy Museo Storico della Fisica Centro Studi e Ricerche Enrico Fermi Compendio Viminale I-00184 Roma Italy

Social resource sharing systems like YouTube and *** have acquired a large number of users within the last few years. They provide rich resources for data analysis, information retrieval, and knowledge discovery applications. A first step towards this end is to gain better insights into content and structure of these systems. In this paper, we will analyse the main network characteristics of two of these systems. We consider their underlying data structures - so-called folksonomies - as tri-partite hypergraphs, and adapt classical network measures like characteristic path length and clustering coefficient to them. Subsequently, we introduce a network of tag co-occurrence and investigate some of its statistical properties, focusing on correlations in node connectivity and pointing out features that reflect emergent semantics within the folksonomy. We show that simple statistical indicators unambiguously spot non-social behavior such as spam. © 2007 - IOS Press and the authors. All rights reserved.

关键词： Information systems

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Benchmarking knowledge-based context delivery systems

Benchmarking knowledge-based context delivery systems

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2006 International Conference on Autonomic and Autonomous Systems, ICAS'06

作者： Keeney, John Lewis, David O'Sullivan, Declan Department of Computer Science Knowledge and Data Engineering Group Trinity College Dublin Dublin Ireland

ISBN: (纸本)0769526535

As context-aware systems become more widespread and mobile there is an increasing need for a common distributed event platform for gathering context information and delivering to context-aware applications. The likely heterogeneity across the body of context information can be addressed using runtime reasoning over ontology-based context models. However, existing knowledge-based reasoning is not typically optimised for real-time operation so its inclusion in any context delivery platform needs to be carefully evaluated from a performance perspective. In this paper we propose a benchmark for knowledge-based context delivery platforms and in particular examine suitable knowledge benchmarks for assessing the ability of platforms to deal with semantic interoperability. © 2006 IEEE.

关键词： Benchmarking

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Hybrid interfaces in VEs: Intent and interaction

Hybrid interfaces in VEs: Intent and interaction

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12th Eurographics Symposium on Virtual Environments, EGVE 2006

作者： De Haan, Gerwin Griffith, Eric J. Koutek, Michal Post, Frits H. Data Visualization Group Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Netherlands

ISBN: (纸本)3905673339

Hybrid user interfaces (UIs) integrate well-known 2D user interface elements into the 3D virtual environment, and provide a familiar and portable interface across a variety of VR systems. However, their usability is often reduced by accuracy and speed, caused by inaccuracies in tracking and a lack of constraints and feedback. To ease these difficulties often large widgets and bulky interface elements must be used, which, at the same time, limit the size of the 3D workspace and restrict the space where other supplemental 2D information can be displayed. In this paper, we present two developments addressing this problem: supportive user interaction and a new implementation of a hybrid interface. First, we describe a small set of tightly integrated 2D windows we developed with the goal of providing increased flexibility in the UI and reducing UI clutter. Next we present extensions to our supportive selection technique, IntenSelect. To better cope with a variety of VR and UI tasks, we extended the selection assistance technique to include direct selection, spring-based manipulation, and specialized snapping behavior. Finally, we relate how the effective integration of these two developments eases some of the UI restrictions and produces a more comfortable VR experience. © The Eurographics Association 2006.

关键词： User interfaces

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A framework for specification and performance evaluation of service discovery protocols in mobile ad-hoc networks

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Ad Hoc Networks 2006年第1期4卷 1-23页

作者： Shenoi, Avinash Yesha, Yelena Yesha, Yaacov Joshi, Anupam Department of Computer Science and Electrical Engineering University of Maryland Baltimore County 1000 Hilltop Circle Baltimore MD 21250 United States Ebiquity Research Group Department of Computer Science and Electrical Engineering University of Maryland Baltimore County IEEE Transaction on Knowledge and Data Engineering IEEE ACM UMBC IEEE Transactions of Fuzzy Systems IEEE IEEE-CS ACM

Service discovery protocols are extremely important for developing distributed applications in ad-hoc environments. However to perform Service Discovery in mobile ad-hoc networks requires the design and development of extremely complex and dynamic systems. This requires a paradigm shift in the methodologies employed to design and evaluate these systems so as to ensure quality and correctness. Currently there exists no generic method for formally specifying these systems. Due to this it is extremely difficult to formally analyze protocols in this domain to study and observe the behavior. The same issue also hinders comparison of different protocols against a fixed set of metrics. In this work we propose a framework for the formal specification of service discovery protocols in mobile ad-hoc networks. The purpose of this framework is to provide a formal basis for performance evaluation and behavioral study of these protocols. This allows different service discovery architectures to be evaluated against a given set of metrics, a generic way to specify protocols and an automated process for performance evaluation and behavioral study. © 2004 Elsevier B.V. All rights reserved.

关键词： Network protocols

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Dynamic ontology integration in a multi-agent environment

Dynamic ontology integration in a multi-agent environment

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International Conference on Advanced Information Networking and Applications (AINA)

作者： S.M. Deen K. Ponnamperuma Data and Knowledge Engineering DAKE Group Department of Computer Science University of Keele UK

We present here an approach for dynamic ontology integration for a multi-agent environment, in which each agent holds the ontologies of its acquaintances (i.e., other agents of its interest) as the integrated partial global ontology, which is essential to interpret the local schemas for inter-agent operations. This integration has to be carried out whenever a new acquaintance is added or when the local ontology of an acquaintance changes. The approach described is general (i.e., independent of any particular thesaurus) and it carries out the integration automatically except for minimal unavoidable human inputs to resolve semantic conflicts if discovered in the process.

关键词： Ontologies Thesauri Humans Semantic Web Peer to peer computing Multiagent systems knowledge engineering computer science Shape Scalability

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A Framework for the Decentralisation and Management of Collaborative Applications in Ubiquitous Computing Environments

A Framework for the Decentralisation and Management of Colla...

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IEEE Symposium on Network Operations and Management

作者： K. Quinn A. Kenny K. Feeney D. Lewis D. O'Sullivan V.P. Wade Knowledge & Data Engineering Group Department of Computer Science Trinity College Dublin Dublin Ireland

When deploying collaborative applications such as instant messaging in ubiquitous computing environments significant enhancements can be afforded by offering additional context information, such as location information. However, such environments exert key challenges such as increased diversity of ownership and ad hoc, intermittent network connectivity that suits more decentralized computing architectures. This paper examines how a migration to a more decentralized collaborative architecture can be achieved together with a decentralization of the management of collaborative activities

关键词： Environmental management Collaboration Ubiquitous computing Access control Application software computer architecture Routing Humans Content management Peer to peer computing

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