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D. Lucarella

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D. Lucarella

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Publications by D. Lucarella (bibliography)

» 1996 «

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Lucarella, D. and Zanzi, Antonella (1996): A Visual Retrieval Environment for Hypermedia Information Systems. In ACM Transactions on Information Systems, 14 (1) pp. 3-29

“We present a graph-based object model that may be used as a uniform framework for direct manipulation of multimedia information. After an introduction motivating the need for abstraction and structuring mechanisms in hypermedia systems, we introduce the data model and the notion of perspective, a form of data abstraction that acts as a user interface to the system, providing control over the visibility of the objects and their properties. A perspective is defined to include an intension and an extension. The intension is defined in terms of a pattern, a subgraph of the schema graph, and the extension is the set of pattern-matching instances. Perspectives, as well as database schema and instances, are graph structures that can be manipulated in various ways. The resulting uniform approach is well suited to a visual interface. A visual interface for complex information systems provides high semantic power, thus exploiting the semantic expressibility of the underlying data model, while maintaining ease of interaction with the system. In this way, we reach the goal of decreasing cognitive load on the user, with the additional advantage of always maintaining the same interaction style. We present a visual retrieval environment that effectively combines filtering, browsing, and navigation to provide an integrated view of the retrieval problem. Design and implementation issues are outlined for MORE (Multimedia Object Retrieval Environment), a prototype system relying on the proposed model. The focus is on the main user interface functionalities, and actual interaction sessions are presented including schema creation, information loading, and information retrieval.”

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» 1993 «

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Lucarella, D., Parisotto, Stefano and Zanzi, Antonella (1993): MORE: Multimedia Object Retrieval Environment. In: Stotts, P. David and Furuta, Richard (eds.) Proceedings of ACM Hypertext 93 Conference November 14-18, 1993, Seattle, Washington. pp. 39-50. Available online

“In this paper, we present a graph-based object model that will be used as a uniform framework for direct manipulation of multimedia information. Essentially, we propose a graph representation of the conceptual schema, the object instances, and the user queries. The resulting uniform approach is well suited to a visual interface in which the user, supported by appropriate tools, manipulates directly on the screen object graphs for different purposes as schema definition, querying, browsing, and viewing. Next, we give formal definitions of such operations along with examples concerning a real multimedia application we have developed in order to experiment with the proposed approach. Finally, design and implementation issues are discussed for MORE, a prototype system that, combining effectively browsing and querying techniques, provides a visual environment for multimedia information retrieval.”

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» 1992 «

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Lucarella, D., Nanard, Jocelyne, Nanard, Marc and Paolini, P. (eds.) Proceedings of ECHT 92 the Fourth ACM Conference on Hypertext November 30 - December 04, 1992, Milano, Italy.

» 1990 «

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Lucarella, D. (1990): A Model for Hypertext-Based Information Retrieval. In: Rizk, Antoine, Streitz, Norbert A. and Andre, Jacques (eds.) ECHT 90 - European Conference on Hypertext November 27-30, 1990, Versailles, France. pp. 81-94.

“This paper approaches the problem of information retrieval from hypertext. In this context, the retrieval process is regarded as a process of inference that can be carried out either by the user exploring the hypertext network (browsing), or by the system, exploiting the hypertext network as a knowledge base (searching). That is the reason why a comprehensive model should take into account both of the perspectives, combining effectively browsing and searching in a unified framework. In the following, such a model is defined and implementation issues are outlined for a hypertext-based information retrieval system.”

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