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检索条件"任意字段=7th International and Interdisciplinary Conference on Modeling and Using Context"

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using Moving Object Databases to Provide context Information in Mobile Ad-hoc Networks

Using Moving Object Databases to Provide Context Information...

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international conference on Mobile Data Management

作者： J. Bose K. Hahn M. Scholz H. Schweppe A. Voisard Institute of Computer Science Freie Universität Berlin Germany

Applications deployed in mobile peer-to-peer systems have to cope with mobility and fluctuation of nodes. these dynamics restrict the reliability of communication links as well as the availability of certain nodes, services, and resources. Exploring the context of nodes can be used to anticipate these shortages. context-awareness enables improvement of performance of systems and enables adaptation of applications in order to make their behavior more relevant with respect to their current situation. Preevaluation of context can be used to estimate future availability of crucial resources and reliability of communication links. Which information is considered to be relevant context information varies according to the application scenario. In this paper, we present a model for context information along with a mobile service that provides a local view of surrounding nodes in a Mobile Ad-hoc NETwork (MANET). the service is designed to enable efficient prediction of future stability of the vicinity of a node.

关键词： Databases Ad hoc networks Peer to peer computing Telecommunication network reliability Mobile communication Availability Fluctuations context modeling context-aware services Mobile ad hoc networks

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the role of foundational ontologies for conceptual modeling and domain ontology representation

The role of foundational ontologies for conceptual modeling ...

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international Baltic conference on Databases and Information Systems, DB&IS

作者： G. Guizzardi Laboratory for Applied Ontology (LOA) ISTC-CNR Trento Italy Computer Science Department Federal University of Espírito Santo Vitoria Brazil

In recent years, there has been a growing interest in the development and use of domain ontologies, strongly motivated by the semantic Web initiative. However, as we demonstrate in this paper, an approach for ontology representation uniquely based on the modeling languages adopted in the semantic Web is insufficient to address a number of semantic interoperability problems that arise in concrete application scenarios. the main objective of this paper is to advocate in favor of an approach for conceptual modeling, in general, and domain ontology representation, in particular, in which lightweight modeling languages such as OWL and standard UML are complemented by modeling languages and methodologies based on theoretically principled foundational ontologies

关键词： Ontologies Semantic Web context-aware services Computer science OWL Unified modeling language Laboratories Concrete Artificial intelligence Information systems

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A heuristic approach to vertical fragmentation incorporating query information

A heuristic approach to vertical fragmentation incorporating...

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international Baltic conference on Databases and Information Systems, DB&IS

作者： Hui Ma K.-D. Schewe M. Kirchberg Information Science Research Centre & Department of Information Systems Massey University Palmerston North New Zealand

Fragmentation, allocation and replication are database distribution design techniques that aim at improving the system performance. Among the two fragmentation techniques, vertical fragmentation is often considered more complicated than horizontal fragmentation, because the huge number of alternatives makes it nearly impossible to obtain an optimal solution to the vertical fragmentation problem. therefore, we can only expect to find out a heuristic solution. Often fragmentation and allocation are considered separately, disregarding that they are using the same input information to achieve the same objective, i.e. improve the overall system performance. this paper addresses vertical fragmentation and allocation simultaneously in the context of the relational model. the core of the paper is a heuristic approach to vertical fragmentation, which uses a cost model and is targeted at globally minimising these costs

关键词： Costs Clustering algorithms Partitioning algorithms System performance Bonding Active appearance model Information science Information systems Databases context modeling

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modeling bayesian networks for autonomous diagnosis of web services

Modeling bayesian networks for autonomous diagnosis of web s...

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FLAIRS 2006 - 19th international Florida Artificial Intelligence Research Society conference

作者： Wang, Haiqin Wang, Guijun Chen, Alice Wang, Changzhou Fung, Casey K. Uczekaj, Stephen A. Santiago, Rodolfo A. Boeing Phantom Works MC 7L-66 P.O.Box 3707 Seattle WA 98124

We took an innovative approach to service level management for network enterprise systems by using integrated monitoring, diagnostics, and adaptation services in a service-oriented architecture. the autonomous diagnosis for trouble-shooting of web service interruptions is based on Bayesian network models. In this paper, we present our methods for building the diagnostic models. We focus on two types of Bayesian network models of different structure complexity. Our result shows that the two-layer model outperforms the three-layer model in the applied domain. this challenges the common belief that adding unnecessary nodes in a Bayesian network and growing its structural complexity does not deteriorate performance. Hence such practice of building more complex models than necessary should be approached cautiously within the context of the applied domain.

关键词： World Wide Web

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A Rule-based Approach to Content Delivery Adaptation in Web Information Systems

A Rule-based Approach to Content Delivery Adaptation in Web ...

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international conference on Mobile Data Management

作者： R. De Virgilio R. Torlone G. Houben Università Roma Tre Rome Italy Vrije Universiteit Brussel Brussels Belgium

In this paper, we present a rule-based approach supporting the automatic adaptation in Web Information Systems. the approach relies on the general notions of profile and configuration. Special rules are used to specify, in a declarative way, how to build a configuration that satisfies the requirements of adaptation for a profile. the rule evaluation technique guarantees that different contexts and orthogonal requirements of adaptation, possibly not fixed in advance, can be taken into account in the adaptation process.

关键词： Information systems Navigation Cellular phones Information filtering Information filters Adaptive systems Delay context modeling conference management Content management

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Towards recognizing emotion with affective dimensions through body gestures

Towards recognizing emotion with affective dimensions throug...

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international conference on Automatic Face and Gesture Recognition

作者： P.R. De Silva M. Osano A. Marasinghe A.P. Madurapperuma Software Engineering Laboratory University of Aizu Aizu-Wakamatsu Japan Faculty of Information Technology University of Moratuwa Colombo Sri Lanka

Due to the ever-increasing importance of computers in many areas of today's society such as e-learning, telehome-health care, and entertainment, their ability to interact well with humans is essential. Currently, researchers are using facial expression and voice recognition modalities to create systems that interact with humans. But still two problems exist: gesture is not yet a concern as a channel of affective communication in interactive technology, and existing systems only model discrete categories but not affective dimensions, e.g., intensity. Our focus has been on creating affective gesture recognition system that recognize child's emotion with intensity through body gestures in context of game. this information is then used by a game control module that users a rule-based adaptation model to change game level according to the child's intensity of emotions. Results show that affective gesture recognition model recognized child's emotion over 79% of the cases and the proposed intensity estimate model has a strong relationship with observer perception except in the low intensity level

关键词： Emotion recognition Humans Electronic learning Face recognition Speech recognition Communications technology Biological system modeling context Communication system control Adaptation model

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context Integration for Mobile Data Tailoring 06

Context Integration for Mobile Data Tailoring

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international conference on Mobile Data Management

作者： C. Bolchini C. Curino F.A. Schreiber L. Tanca Dipartimento di Elettronica e Informazione Politecnico di Milan Milan Italy

ISBN: (纸本)9780769525266

Independent, heterogeneous, distributed, sometimes transient and mobile data sources produce an enormous amount of information that should be semantically integrated and filtered, or, as we say, tailored, based on the user’s interests and context. Since both the user and the data sources can be mobile, and the communication might be unreliable, caching the information on the user device may become really useful. therefore new challenges have to be faced such as: data filtering in a context-aware fashion, integration of not-known-in-advance data sources, automatic extraction of the semantics. We propose a novel system named context-ADDICT (context-Aware Data Design, Integration, Customization and Tailoring) able to deal with the described scenario. the system we are designing aims at tailoring the available information to the needs of the current user in the current context, in order to offer a more manageable amount of information; such information is to be cached on the user’s device according to policies defined at design-time, to cope with data source transiency. this paper focuses on the information representation and tailoring problem and on the definition of the global architecture of the system.

关键词： Information filtering Information filters Ontologies Mobile communication Data mining Peer to peer computing context modeling Information management Information representation Internet

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using sparc to extract risk insights from performance assessments for HLW repositories

Using sparc to extract risk insights from performance assess...

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8th international conference on Probabilistic Safety Assessment and Management, PSAM 2006

作者： Ghosh, S. Tina Apostolakis, George E. U.S. Nuclear Regulatory Commission Mail Stop: T-7F27 Washington DC 20555 United States Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 United States

ISBN: (纸本)0791802442

Assessing risk from potential geologic repositories for high-level radioactive waste (HLW) poses a unique challenge because of the large temporal and spatial scales involved. the repository systems typically involve multiple engineered barriers and emplacement in a remote geologic location. It is not feasible to conduct experiments on the scale of a repository system. As a result, scientists rely on inference from shorter-term, controlled laboratory and field experiments, as well as historical data from natural analogs to model the system. this leads to uncertainties in modeling the risk from the repository. the importance of these uncertainties depends on the context for conducting and using the risk assessments. the U.S. National Research Council has pointed out that the proper role of risk assessments is to inform societal decisions and facilitate deliberation among stakeholders. In the case of HLW repositories, the most important sources of risk information for these decisions are the results of integrated repository system modeling compiled in performance assessments (PA). these PAs inform critical decisions for national HLW repository programs. the important uncertainties in the PA are those to which decisions may be sensitive. To build confidence given potentially important uncertainties, a typical safety case for a proposed HLW repository is comprised of PA results coupled with various defense-in-depth elements, such as the multiple-barrier requirement for repository design, and insights from supplementary analyses. this paper proposes an additional supplementary analysis, the Strategic Partitioning of Assumption-Ranges and Consequences (SPARC), whose goal is to construct a specific explanation of the PA results of interest, to aid risk-informed decision-making and riskinformed stakeholder deliberation. the method seeks to provide explanations for undesired system behavior that are similar to those provided by a reactor probabilistic safety assessment (PSA);

关键词： Risk assessment

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context 2005 - Proceedings of the Workshops on Cooperative Systems and context, and, Groupware and context, Organized at the 5th international and interdisciplinary conference on modeling and using context

CONTEXT 2005 - Proceedings of the Workshops on Cooperative S...

引用

Workshops on Cooperative Systems and context;and, on context and Groupware, context 2005

the proceedings contain 10 papers. the topics discussed include: a learning interaction memory using contextual information;towards the narrative approach to collect group knowledge and context;AulaNetM: extension of the AulaNet environment to PDAs;context in collaborative mobile scenarios;the decision hedgehog - enhancing contextual knowledge for group decision authoring and communication support;contextual support for remote cooperative troubleshooting: lessons from a naturalistic study*;placing newly-arising goals in the proper context*;first steps in context modeling for conflicts characterization in cooperative task-execution support systems;towards rich context virtual worlds;and enhancing collaboration services with business context models.

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the Dynamics of Convergence and Divergence in Educational Media -- Past, Present and Future

The Dynamics of Convergence and Divergence in Educational Me...

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international conference on Information Technology Based Higher Education and Training, IthET

作者： Gunnar Liestol Department of Media & Communication University of Oslo Norway

the use and application of concepts such as 'convergence' and 'divergence' are general and vague and often demonstrate internal inconsistencies. Despite this fact, or rather because of it, this paper will take the convergence/divergence dichotomy as a starting point in order to present a model for the understanding of the dynamics in the relationship between convergence and divergence in educational media. this model of convergence and divergence will then aim to show how educational genres relate to and are constrained by technology, production and use in various social, cultural and historical settings. the model is simple and flexible and will be applied to demonstrate how genre convergence and divergence takes place in different educational contexts: past, present and future.

关键词： Convergence Educational technology context modeling Production Cultural differences Seminars Technological innovation Hardware

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