Context-Aware Database Querying: Recent Progress and Challenges

Context-Aware Database Querying: Recent Progress and Challenges

Yuanping Li (Tsinghua University, China), Ling Feng (Tsinghua University, China) and Lizhu Zhou (Tsinghua University, China)
DOI: 10.4018/978-1-60566-290-9.ch006
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Abstract

Context is an essential element in mobile and ubiquitous computing. Users’ information needs can be better understood and supplied by means of context-awareness. Context data may be sensed, inferred, or directly input by users, and so forth, which calls for specific query mechanisms to acquire context information. On the other hand, traditional non-context-aware database querying techniques need to be re-examined, taking query context into account. In order to design effective context-aware database query processing mechanism, the authors survey the latest developed context-aware querying techniques in the data management field. They outline six ways to query context directly, and provide a categorization about how to use context in querying traditional databases. The approaches of handling imperfect context in context-aware database querying are also described. They discuss some potential research issues to be addressed at the end of the chapter.
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Background

To start the discussion, let us first look at two scenarios, which may occur in a mobile and ubiquitous computing environment.

Scenario 1. John is on a vocational trip and come to a city for the first time. He has a tour guide in his PDA, and the main function of this tour guide is to tell John where he is. When he wants to visit the museum, he uses the PDA to guide his way to museum. When he is visiting the museum, the PDA can provide the information of an exhibit when he comes close to the exhibit. Such a function needs to request location context information from a GPS provider or a RFID system.

The scenario involves querying context information. In many context-aware applications, context information acquisition is essential and should be considered before using context information. It is always necessary to provide sufficient support for context querying in context-aware applications because many operations and functions of the applications would be based on it.

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Editorial Advisory Board
Table of Contents
Foreword
Thomas Strang
Foreword
Theo Kanter
Preface
Dragan Stojanovic
Acknowledgment
Dragan Stojanovic
Chapter 1
Davy Preuveneers, Koen Victor, Yves Vanrompay, Peter Rigole, Manuele Kirsch Pinheiro
In recent years, many researchers have studied context-awareness to support non-intrusive adaptability of context-aware applications. Context-aware... Sample PDF
Context-Aware Adaptation in an Ecology of Applications
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Chapter 2
Tarak Chaari, Mohamed Zouari, Frédérique Laforest
Pervasive information systems aim to make information available anywhere and at anytime. These systems should be used in different contexts... Sample PDF
Ontology Based Context-Aware Adaptation Approach
$37.50
Chapter 3
Florian Daniel
Adaptivity (the runtime adaptation to user profile data) and context-awareness (the runtime adaptation to generic context data) have been gaining... Sample PDF
Context-Aware Applications for the Web: A Model-Driven Development Approach
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Chapter 4
I. Roussaki, M. Strimpakou, C. Pils, N. Kalatzis, N. Liampotis
In ubiquitous computing environments, context management systems are expected to administrate large volumes of spatial and non-spatial information... Sample PDF
Distributed Context Management in Support of Multiple Remote Users
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Chapter 5
Jared Zebedee, Patrick Martin, Kirk Wilson, Wendy Powley
Pervasive computing presents an exciting realm where intelligent devices interact within the background of our environments to create a more... Sample PDF
An Adaptable Context Management Framework for Pervasive Computing
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Chapter 6
Yuanping Li, Ling Feng, Lizhu Zhou
Context is an essential element in mobile and ubiquitous computing. Users’ information needs can be better understood and supplied by means of... Sample PDF
Context-Aware Database Querying: Recent Progress and Challenges
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Chapter 7
Carsten Jacob, Heiko Pfeffer, Stephan Steglich
The idea of context-aware services has been around for a long time. The rise of user mobility enabled by well-equipped mobile devices, increasing... Sample PDF
Employing Context Information and Semantics to Advance Responsiveness in Service Composition
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Chapter 8
Heinz-Josef Eikerling, Pietro Mazzoleni
The authors present a holistic approach for the efficient design, implementation, and validation of context-aware mobile services. The according... Sample PDF
A Methodology for the Design, Development and Validation of Adaptive and Context-Aware Mobile Services
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Chapter 9
Stefan Dietze, Alessio Gugliotta, John Domingue
Context-awareness is highly desired, particularly in highly dynamic mobile environments. Semantic Web Services (SWS) address context-adaptation by... Sample PDF
Bridging the Gap between Mobile Application Contexts and Semantic Web Resources
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Chapter 10
Claudia Raibulet
Due to its nature, a mobile-enabled environment is very dynamic: reachable resources and services change very often. Users hardly know which... Sample PDF
Adaptive Resource and Service Management in a Mobile-Enabled Environment
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Chapter 11
Nahuel Lofeudo, Andrés Fortier, Gustavo Rossi
Mobile context-aware applications have specific needs regarding data communications and position sensing, that current standard hardware is still... Sample PDF
Kindergarten: A Novel Communication Mechanism for Mobile Context-Aware Applications
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Chapter 12
Laurent Gomez, Annett Laube, Alessandro Sorniotti
Access control is the process of granting permissions in accordance to an authorization policy. Mobile and ubiquitous environments challenge... Sample PDF
Access Control in Mobile and Ubiquitous Environments
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Chapter 13
Amr Ali Eldin, Semir Daskapan, Jan van den Berg
With the growing interest in context-aware services, attention has been given to privacy and trust issues. Context-aware privacy architectures are... Sample PDF
Privacy Automation in Context-Aware Services
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Chapter 14
Adrien Joly, Pierre Maret, Fabien Bataille
These times, when the amount of information exponentially grows on the Internet, when most people can be connected at all times with powerful... Sample PDF
Leveraging Semantic Technologies towards Social Ambient Intelligence
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Chapter 15
Federica Paganelli, Dino Giuli
The delivery of real-time, context-aware, and personalized information to end-users for mobility support is a high-priority objective in improving... Sample PDF
An Evaluation of Context-Aware Infomobility Systems
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Chapter 16
Nikos Tsianos, Panagiotis Germanakos, Zacharias Lekkas, Constantinos Mourlas
The notion of context in context-aware applications is not merely an issue of external situational circumstances or device/channel properties, but... Sample PDF
Incorporating Human Factors in the Development of Context-Aware Personalized Applications: The Next Generation of Intelligent User Interfaces
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About the Contributors