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Browsing by Author "Raghavan, Ananth"

Now showing 1 - 5 of 5
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    Evaluation of a Location Linked Notes System
    Tungare, Manas; Burbey, Ingrid; Raghavan, Ananth; Pérez-Quiñones, Manuel A. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2004)
    We present a location-aware messaging system that lets users read and post notes tied to a particular location. We developed multiple clients (desktop, PDA and cell phone) so that users could choose the most contextually-appropriate device to interact with the system. We allowed remote access and authoring to avoid imposing artificial restrictions on users. We report on our initial evaluation of the system. The goal of the evaluation was to explore novel potential uses of the system and to identify users' preferences regarding the different system features. In our evaluation, we found that users were receptive of this system for leaving and receiving location-targeted reminders. They also overwhelmingly approved of the remote access and authoring capability, and suggested scenarios where these features would be crucial. We discuss our experiences building the system and our findings from the initial evaluation.
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    Incremental, Semi-automatic, Mapping-Based Integration of Heterogeneous Collections into Archaeological Digital Libraries: Megiddo Case Study
    Raghavan, Ananth; Vemuri, Naga Srinivas; Shen, Rao; Goncalves, Marcos A.; Fan, Weiguo; Fox, Edward A. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2005)
    Automation is an important issue when integrating heterogeneous collections into archaeological digital libraries. We propose an incremental approach through intermediary- and mapping-based techniques. A visual schema mapping tool within the 5S framework allows semi-automatic mapping and in-cremental global schema enrichment. 5S also helped speed up development of a new multi-dimensional browsing service. Our approach helps integrate the Me-giddo excavation data into a growing union archaeological DL, ETANA-DL.
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    Integration of Heterogeneous Digital Libraries with Semi-automatic Mapping and Browsing: From Formalization to Specification to Visualization
    Shen, Rao; Vemuri, Naga Srinivas; Raghavan, Ananth; Goncalves, Marcos A.; Rangarajan, Divya; Fan, Weiguo; Fox, Edward A. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2005)
    In this paper, we formalize the digital library (DL) integration problem and propose an overall approach based on the 5S framework. We apply 5S to domain-specific (archaeological) DLs, illustrating our solutions for key problems in DL integration. We use ETANA-DL as a case study to describe the process of semi-automatically generating a union catalog and a unified browsing service in an archaeological DL. A visual schema mapping tool is developed for union catalog creation. A pilot user study aids tool evaluation. Our approach is further validated through application of a general browsing component to two integrated DLs.
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    Schema Mapper: A Visualization Tool for DL Integration
    Raghavan, Ananth; Rangarajan, Divya; Shen, Rao; Goncalves, Marcos A.; Vemuri, Naga Srinivas; Fan, Weiguo; Fox, Edward A. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2005)
    Schema mapping is a challenging problem. It has come to the fore in recent years; there are important applications like database schema integration and, more recently, digital library merging of heterogeneous data. Previous studies have approached the schema mapping process either from algorithmic or visualization perspectives, with few integrating both. With Schema Mapper we demonstrate a semi-automatic tool for schema integration that combines a novel visual interface with an algorithm-based recommendation engine. Schemas are visualized as hyperbolic trees (see Fig. 1), thus allowing more schema nodes to be displayed at one time. Matches to selections are recommended to the user, which makes the mapping operation easier and faster.
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    Schema Mapper: A Visualization Tool for Incremental Semi-automatic Mapping-based Integration of Heterogeneous Collections into Archaeological Digital Libraries: The ETANA-DL Case Study
    Raghavan, Ananth (Virginia Tech, 2005-05-04)
    Schema mapping is a challenging problem. It has come to the fore in recent years; there are important applications like database schema integration and, more recently, digital library (DL) merging of heterogeneous data. With Schema Mapper we demonstrate a semi-automatic tool for schema integration that combines a novel visual interface with an algorithm-based recommendation engine. We use ETANA-DL, a digital library developed to support integration of data from Near Eastern archaeology sites, as we explore integrating new collections. Schemas are visualized as hyperbolic trees, thus allowing more schema nodes to be displayed at one time. Matches to selections are recommended to the user, which makes the mapping operation easier and faster. Once the user has completed the mapping operation, a wrapper (XSLT Style Sheet) is created automatically with the mappings which can be applied to transform source XML files into target XML files. Schema Mapper allows editing the target schema as part of the process of incremental enrichment of the target schema. This involves operations like adding a node as a child, renaming a node, and deleting a node. The changes to the target schema also can be logged to disk. Schema Mapper has been applied to integrate the Megiddo Collection successfully into the ETANA-DL Union Catalog. It also has been applied for data-level mapping, to ensure consistency of data representation to the users who access the information through services provided by the DL. Formative evaluation and a preliminary comparison with MapForce suggest that Schema Mapper may be usefully employed for schema mapping.