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18th International Workshop on Database and Expert Systems Applications (DEXA 2007)

3-7 Sept. 2007

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  • 18th International Conference on Database and Expert Systems Applications - Cover

    Publication Year: 2007, Page(s): c1
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  • 18th International Conference on Database and Expert Systems Applications-Title

    Publication Year: 2007, Page(s):i - iii
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  • 18th International Conference on Database and Expert Systems Applications - Copyright notice

    Publication Year: 2007, Page(s): iv
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  • 18th International Conference on Database and Expert Systems Applications - TOC

    Publication Year: 2007, Page(s):v - xviii
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  • Message from the Program Chairs

    Publication Year: 2007, Page(s): xix
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  • Workshop introduction and organizers

    Publication Year: 2007, Page(s):1 - 4
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  • Querying XML Data using PC Cluster System

    Publication Year: 2007, Page(s):5 - 9
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (391 KB) | HTML iconHTML

    This paper proposes a novel approach for querying large-scale XML data using PC cluster system. With the recent spread of the XML format, large-scale data coded in XML ranging from several hundreds of megabytes to several gigabytes has become common. However, XML databases are often innefficient in dealing with huge XML data. The problem is the complexity of the XML data model and query processing... View full abstract»

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  • FOX: Inference of Approximate Functional Dependencies from XML Data

    Publication Year: 2007, Page(s):10 - 14
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (186 KB) | HTML iconHTML

    Functional dependencies (FDs) are an integral part of relational database theory since they are used in integrity enforcement and in database design. Despite their importance FDs are often not specified or some of them are not expected by database designers, but they occur in the data and the need of inferring them from data arises. Furthermore, in several areas as data cleaning, data integration ... View full abstract»

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  • A Generic Framework for Target-Specific Transformation Operators in XML Transformation Languages

    Publication Year: 2007, Page(s):15 - 19
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB) | HTML iconHTML

    A key issue in exchanging XML-based data is their transformation. However, available transformation languages are generally still low-level. Their low-level transformation operators do not reflect the target language concepts and terminologies. Moreover, transformation correctness is usually beyond the scope of such operators. This paper presents a generic framework which offers higher-level trans... View full abstract»

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  • Synopsis Data Structures for XML Databases: Models, Issues, and Research Perspectives

    Publication Year: 2007, Page(s):20 - 24
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB) | HTML iconHTML

    Due to the lack of efficient native XML database management systems, XML data manipulation and query evaluation may be resource-consuming, and represent a bottleneck for several computationally intensive applications. To overcome the above limitations, a possible solution consists in computing synopsis data structures from XML databases, i.e. compressed representations providing a "succinct" descr... View full abstract»

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  • Modeling and Validating Spatio-Temporal Conceptual Schemas in XML Schema

    Publication Year: 2007, Page(s):25 - 29
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB) | HTML iconHTML

    In this paper, we describe a translation algorithm that maps spatio-temporal conceptual schemas into XML schemas expressed in the W3C XML Schema Language. Moreover, we extend the standard XML Schema validator with a Java library to check spatio-temporal constraints. The resulting framework allows one to validate XML documents containing spatio-temporal information with respect to spatio-temporal c... View full abstract»

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  • XML Query Optimisation: Specify your Selectivity

    Publication Year: 2007, Page(s):30 - 34
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (166 KB) | HTML iconHTML

    The problem of efficiently evaluating XPath and XQuery queries has become increasingly significant since more and more XML data is stored in its native form. We propose a novel optimisation technique for XML queries that is based on the semantic properties exhibited by XML data. In sharp contrast to previous studies on selectivity estimation we propose to specify bounds on the number of element no... View full abstract»

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  • Freshness Control of XML Documents for Query Load Balancing

    Publication Year: 2007, Page(s):35 - 39
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (290 KB) | HTML iconHTML

    We present an approach for controlling the freshness of replicated XML documents. The main idea is that read-only transactions may accept to read stale data, provided they can express an upper bound on the staleness of the data they read. Controlling the freshness of data accessed by read-only transactions greatly improves load balancing since it allows for choosing a node for executing the transa... View full abstract»

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  • Incrementally-Updatable Stream Processors for XPath Queries based on Merging Automata via Ordered Hash-keys

    Publication Year: 2007, Page(s):40 - 44
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (182 KB) | HTML iconHTML

    Various kinds of data such as news articles and sensor data are generated continuously in the form of XML data on the network. The processing systems (e.g., systems for selective dissemination of information and notification) must evaluate many filters for every XML data. Therefore, Gupta and Suciu proposed an automaton called the XPush machine, which can efficiently evaluate a large number of XPa... View full abstract»

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  • Workshop introduction and organizers

    Publication Year: 2007, Page(s):45 - 48
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  • Video Shots Comparison using the Mallows Distance

    Publication Year: 2007, Page(s):49 - 53
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4959 KB) | HTML iconHTML

    In this work, we focus on two aspects of the comparison of video shots. We present a new approach to extract a variable number of key frames from a shot, by the use of a hierarchical clustering with automatic level selection, in order to provide optimal allocation of features on different parts of the shot. We then employ the Mallows distance as an effective technique to compare the discrete distr... View full abstract»

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  • Unsupervised Learning of Manifolds via Linear Approximations

    Publication Year: 2007, Page(s):54 - 58
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (335 KB) | HTML iconHTML

    In this paper, we examine the application of manifold learning to the clustering problem. The method used is Locality Preserving Projections (LPP), which is chosen because of its computational efficiency. A detailed derivation of the method is presented, as well as the theoretical justification behind it. Experiments performed on CMU's PIE database show that the projections created by LPP yield be... View full abstract»

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  • A New Scheme of Automatic Semantic Propagation in the Image Data base Using a Hierarchical Structure of Semantics

    Publication Year: 2007, Page(s):59 - 63
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB) | HTML iconHTML

    Automatic semantic propagation is an important technique to complete the image retrieval process which is provided to increase accuracy, speed and performance of image retrieval systems and also to decrease human expenses. In this paper, an automatic approach to propagate the semantics in the image data base is presented. The proposed approach provides a suitable framework for semantic propagation... View full abstract»

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  • An Index Structure To Retrieve Documents With Geographic Information

    Publication Year: 2007, Page(s):64 - 68
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (154 KB) | HTML iconHTML

    Both geographic information systems and information retrieval have been very active research fields in the last decades. Lately, a new research field called geographic information retrieval has appeared from the intersection of these two fields. The main goal of this field is to define index structures and techniques to efficiently store and retrieve documents using both the text and the geographi... View full abstract»

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  • A New Approach for Document Indexing UsingWavelet Trees

    Publication Year: 2007, Page(s):69 - 73
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (318 KB) | HTML iconHTML

    The development of applications that manage large text collections needs indexing methods which allow efficient retrieval over text. Several indexes have been proposed which try to reach a good trade-off between the space needed to store both the text and the index, and its search efficiency. Self-indexes are becoming more and more popular. Not only they index the text, but they keep enough inform... View full abstract»

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  • Towards a definition of an Image Ontology

    Publication Year: 2007, Page(s):74 - 78
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (233 KB) | HTML iconHTML

    Archiving, organizing, and searching multimedia data in an appropriate fashion is a task of increasing importance. The ontology theory may be appropriately extended in order to face this challenging issue. In this paper we propose an extension of an Image Database model based on NF2 with an Ontology model. We first describe NF2 and the main concepts of Image Ontologies, then we propose a general a... View full abstract»

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  • Visual Surveillance Metadata Management

    Publication Year: 2007, Page(s):79 - 84
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (235 KB) | HTML iconHTML

    The paper deals with a solution for visual surveillance metadata management. Data coming from many cameras is annotated using computer vision units to produce metadata representing moving objects in their states. It is assumed that the data is often uncertain, noisy and some states are missing. The solution consists of the following three layers: (a) data cleaning layer - improves quality of the d... View full abstract»

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  • Workshop introduction and organizers

    Publication Year: 2007, Page(s):85 - 88
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  • Mobile multimodal applications on mass-market devices: experiences

    Publication Year: 2007, Page(s):89 - 93
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (241 KB) | HTML iconHTML

    Multimodality on mobile terminals has been relegated to very high-end terminals, not spread among normal people. Nevertheless, the evolution of the technologies allows a deployment of synergic multimodal application on smart- phones. We have studied how it is possible to build multimodal clients on mobile handsets, using an innovative approach based on what we have called multimodal objects, tryin... View full abstract»

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  • A Comparison between Decision Trees and Markov Models to Support Proactive Interfaces

    Publication Year: 2007, Page(s):94 - 98
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (449 KB) | HTML iconHTML

    During the past few years, personal portable computer systems such as PDAs or laptops are being used in different contexts such as in meetings, at the office, or at home. In the current era of multimodal interaction, each context may require other interaction strategies or system settings to allow the end-users to reach their envisioned goals. For instance, in a meeting room a user may want to use... View full abstract»

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