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Displaying 1-39 out of 39 total
Managing the Evolution of Dataflows with VisTrails
Found in: Data Engineering Workshops, 22nd International Conference on
By Steven P. Callahan, Juliana Freire, Juliana Freire, Emanuele Santos, Carlos E. Scheidegger, Claudio T. Silva, Huy T. Vo
Issue Date:April 2006
pp. 71
Scientists are now faced with an incredible volume of data to analyze. To successfully analyze and validate various hypotheses, it is necessary to pose several queries, correlate disparate data, and create insightful visualizations of both the simulated pr...
 
BirdVis: Visualizing and Understanding Bird Populations
Found in: IEEE Transactions on Visualization and Computer Graphics
By Nivan Ferreira,Lauro Lins,Daniel Fink,Steve Kelling,Christopher Wood,Juliana Freire,Claudio Silva
Issue Date:December 2011
pp. 2374-2383
Birds are unrivaled windows into biotic processes at all levels and are proven indicators of ecological well-being. Understanding the determinants of species distributions and their dynamics is an important aspect of ecology and is critical for conservatio...
 
VisMashup: Streamlining the Creation of Custom Visualization Applications
Found in: IEEE Transactions on Visualization and Computer Graphics
By Emanuele Santos, Lauro Lins, James Ahrens, Juliana Freire, Claudio Silva
Issue Date:November 2009
pp. 1539-1546
Visualization is essential for understanding the increasing volumes of digital data. However, the process required to create insightful visualizations is involved and time consuming. Although several visualization tools are available, including tools with ...
 
Automatically Extracting Form Labels
Found in: Data Engineering, International Conference on
By Hoa Nguyen, Eun Yong Kang, Juliana Freire
Issue Date:April 2008
pp. 1498-1500
We describe a machine-learning-based approach for extracting attribute labels from Web form interfaces. Having these labels is a requirement for several techniques that attempt to retrieve and integrate data that reside in online databases and that are hid...
 
Organizing Hidden-Web Databases by Clustering Visible Web Documents
Found in: Data Engineering, International Conference on
By Luciano Barbosa, Juliana Freire, Altigran Silva
Issue Date:April 2007
pp. 326-335
In this paper we address the problem of organizing hidden-Web databases. Given a heterogeneous set of Web forms that serve as entry points to hidden-Web databases, our goal is to cluster the forms according to the database domains to which they belong. We ...
 
IMAX: Incremental Maintenance of Schema-Based XML Statistics
Found in: Data Engineering, International Conference on
By Maya Ramanath, Lingzhi Zhang, Juliana Freire, Jayant R. Haritsa
Issue Date:April 2005
pp. 273-284
Current approaches for estimating the cardinality of XML queries are applicable to a static scenario wherein the underlying XML data does not change subsequent to the collection of statistics on the repository. However, in practice, many XML-based applicat...
 
Guest Editors' Introduction: Provenance in Web Applications
Found in: IEEE Internet Computing
By Geetika T. Lakshmanan, Francisco Curbera, Juliana Freire, Amit Sheth
Issue Date:January 2011
pp. 17-21
Provenance, from the French word provenir,
 
Provenance-Enabled Data Exploration and Visualization with VisTrails
Found in: Graphics, Patterns and Images Tutorials, SIBGRAPI Conference on
By Cl´udio Silva, Juliana Freire, Emanuele Santos, Erik Anderson
Issue Date:September 2010
pp. 1-9
Scientists are now faced with an incredible volume of data to analyze. To explore and understand the data, they need to assemble complex workflows (pipelines) to manipulate the data and create insightful visual representations. Provenance is essential in t...
 
XML Management for Bioinformatics Applications
Found in: Computing in Science and Engineering
By Lena Strömbäck,Juliana Freire
Issue Date:September 2011
pp. 12-23
Scientific exploration has become a data-intensive process, and increasing amounts of data need to be stored, analyzed, and shared. XML can help address these needs. As concrete examples from systems biology show, native XML storage can be combined with tr...
 
Scientific Exploration in the Era of Ocean Observatories
Found in: Computing in Science and Engineering
By António Baptista, Bill Howe, Juliana Freire, David Maier, Cláudio T. Silva
Issue Date:May 2008
pp. 53-58
The authors introduce an ocean observatory, offer a vision of observatory-enabled scientific exploration, and discuss the requirements and approaches for generating provenance-aware products in such environments.
 
Provenance for Computational Tasks: A Survey
Found in: Computing in Science and Engineering
By Juliana Freire, David Koop, Emanuele Santos, Cláudio T. Silva
Issue Date:May 2008
pp. 11-21
The problem of systematically capturing and managing provenance for computational tasks has recently received significant attention because of its relevance to a wide range of domains and applications. The authors give an overview of important concepts rel...
 
Provenance for Visualizations: Reproducibility and Beyond
Found in: Computing in Science and Engineering
By Claudio T. Silva, Juliana Freire, Steven P. Callahan
Issue Date:September 2007
pp. 82-89
The demand for the construction of complex visualizations is growing in many disciplines of science, as users are faced with ever increasing volumes of data to analyze. The authors present VisTrails, an open source provenance-management system that provide...
 
Managing XML Data: An Abridged Overview
Found in: Computing in Science and Engineering
By Juliana Freire, Michael Benedikt
Issue Date:July 2004
pp. 12-19
XML's flexibility makes it a natural format for both exchanging and integrating data from diverse data sources. In this survey, the authors give an overview of issues in managing XML data, discuss existing solutions, and outline the current technology's op...
 
Bridging the XML-Relational Divide with LegoDB: A Demonstration
Found in: Data Engineering, International Conference on
By Philip Bohannon, Juliana Freire, Jayant R. Haritsa, Maya Ramanath, Prasan Roy, Jérôme Siméon
Issue Date:March 2003
pp. 759
We present LegoDB, a cost-based XML storage mapping engine that automatically explores a space of possible XML-to-relational mappings and selects an efficient mapping for a given application.
 
From XML Schema to Relations: A Cost-Based Approach to XML Storage
Found in: Data Engineering, International Conference on
By Philip Bohannon, Juliana Freire, Prasan Roy, Jérôme Siméon
Issue Date:March 2002
pp. 0064
As Web applications manipulate an increasing amount of XML, there is a growing interest in storing XML data in relational databases. Due to the mismatch between the complexity of XML's tree structure and the simplicity of flat relational tables, there are ...
 
Personalizing the Web Using Site Descriptions
Found in: Database and Expert Systems Applications, International Workshop on
By Vinod Anupam, Yuri Breitbart, Juliana Freire, Bharat Kumar
Issue Date:September 1999
pp. 732
The information overload on the Web has created a great need for efficient filtering mechanisms. Many sites (e.g., CNN and Quicken) address this problem by allowing a user to create personalized pages that contain only information that is of interest to th...
 
Visual Exploration of Big Spatio-Temporal Urban Data: A Study of New York City Taxi Trips
Found in: IEEE Transactions on Visualization and Computer Graphics
By Nivan Ferreira,Jorge Poco,Huy T. Vo,Juliana Freire,Claudio T. Silva
Issue Date:December 2013
pp. 2149-2158
As increasing volumes of urban data are captured and become available, new opportunities arise for data-driven analysis that can lead to improvements in the lives of citizens through evidence-based decision making and policies. In this paper, we focus on a...
 
Making Computations and Publications Reproducible with VisTrails
Found in: Computing in Science & Engineering
By Juliana Freire,Claudio T. Silva
Issue Date:July 2012
pp. 18-25
The VisTrails system supports the creation of reproducible experiments. VisTrails integrates data acquisition, derivation, analysis, and visualization as executable components throughout the scientific exploration process, and through systematic provenance...
 
Using Mediation to Achieve Provenance Interoperability
Found in: Services, IEEE Congress on
By Tommy Ellqvist, David Koop, Juliana Freire, Cláudio Silva, Lena Strömbäck
Issue Date:July 2009
pp. 291-298
Provenance is essential in scientific experiments. It contains information that is key to preserving the data, to determining their quality and authorship, and to reproduce as well as validate the results. In complex experiments and analyses, where multiple...
 
End-to-End eScience: Integrating Workflow, Query, Visualization, and Provenance at an Ocean Observatory
Found in: eScience, IEEE International Conference on
By Bill Howe, Peter Lawson, Renee Bellinger, Erik Anderson, Emanuele Santos, Juliana Freire, Carlos Scheidegger, António Baptista, Cláudio Silva
Issue Date:December 2008
pp. 127-134
Data analysis tasks at an Ocean Observatory require integrative and and domain-specialized use of database, workflow, visualization systems.
 
Using Mediation to Achieve Provenance Interoperability (Extended Abstract)
Found in: eScience, IEEE International Conference on
By Tommy Ellkvist, David Koop, Juliana Freire, Cláudio Silva, Lena Strömbäck
Issue Date:December 2008
pp. 398-399
Provenance is essential in scientific experiments.
 
VisTrails: Enabling Interactive Multiple-View Visualizations
Found in: Visualization Conference, IEEE
By Louis Bavoil, Steven P. Callahan, Carlos E. Scheidegger, Huy T. Vo, Patricia J. Crossno, Claudio T. Silva, Juliana Freire
Issue Date:October 2005
pp. 18
VisTrails is a new system that enables interactive multiple-view visualizations by simplifying the creation and maintenance of visualization pipelines, and by optimizing their execution. It provides a general infrastructure that can be combined with existi...
 
Visual Exploration of Big Spatio-Temporal Urban Data: A Study of New York City Taxi Trips
Found in: IEEE Transactions on Visualization and Computer Graphics
By Nivan Ferreira,Jorge Poco,Huy T. Vo,Juliana Freire,Claudio T. Silva
Issue Date:December 2013
pp. 2149-2158
As increasing volumes of urban data are captured and become available, new opportunities arise for data-driven analysis that can lead to improvements in the lives of citizens through evidence-based decision making and policies. In this paper, we focus on a...
 
A Flexible Infrastructure for Gathering XML Statistics and Estimating Query Cardinality
Found in: Data Engineering, International Conference on
By Juliana Freire, Maya Ramanath, Lingzhi Zhang
Issue Date:April 2004
pp. 857
No summary available.
   
VisTrails provenance traces for benchmarking
Found in: Proceedings of the Joint EDBT/ICDT 2013 Workshops (EDBT '13)
By Juliana Freire
Issue Date:March 2013
pp. 323-324
The benchmark provenance traces that we have collected come from the VisTrails system for exploratory data analysis and visualization and from the VisTrails, Inc. provenance plugin for Autodesk Maya [1]. They contain diþerent kinds of provenance infor...
     
Clustering Wikipedia infoboxes to discover their types
Found in: Proceedings of the 21st ACM international conference on Information and knowledge management (CIKM '12)
By Huong Dieu Nguyen, Juliana Freire, Thanh Hoang Nguyen, Viviane Moreira
Issue Date:October 2012
pp. 2134-2138
Wikipedia has emerged as an important source of structured information on the Web. But while the success of Wikipedia can be attributed in part to the simplicity of adding and modifying content, this has also created challenges when it comes to using, quer...
     
PruSM: a prudent schema matching approach for web forms
Found in: Proceedings of the 19th ACM international conference on Information and knowledge management (CIKM '10)
By Hoa Nguyen, Juliana Freire, Thanh Hoang Nguyen
Issue Date:October 2010
pp. 1385-1388
There has been a substantial increase in the number of Web data sources whose contents are hidden and can only be accessed through form interfaces. To leverage this data, several applications have emerged that aim to automate and simplify the access to the...
     
Using latent-structure to detect objects on the web
Found in: Procceedings of the 13th International Workshop on the Web and Databases (WebDB '10)
By Juliana Freire, Luciano Barbosa
Issue Date:June 2010
pp. 1-6
An important requirement for emerging applications which aim to locate and integrate content distributed over the Web is to identify pages that are relevant for a given domain or task. In this paper, we address the problem of identifying pages that contain...
     
Querying Wikipedia documents and relationships
Found in: Procceedings of the 13th International Workshop on the Web and Databases (WebDB '10)
By Hoa Nguyen, Huong Nguyen, Juliana Freire, Thanh Nguyen
Issue Date:June 2010
pp. 1-6
Wikipedia has become an important source of information which is growing very rapidly. However, the existing infrastructure for querying this information is limited and often ignores the inherent structure in the information and links across documents. In ...
     
Indexing relations on the web
Found in: Proceedings of the 13th International Conference on Extending Database Technology (EDBT '10)
By Carlos Alberto Heuser, Juliana Freire, Sergio Luis Sardi Mergen
Issue Date:March 2010
pp. 430-440
There has been a substantial increase in the volume of (semi) structured data on the Web. This opens new opportunities for exploring and querying these data that goes beyond the keyword-based queries traditionally used on the Web. But supporting queries ov...
     
A first study on strategies for generating workflow snippets
Found in: Proceedings of the First International Workshop on Keyword Search on Structured Data (KEYS '09)
By Juliana Freire, Lauro Didier Lins, Lena Stromback, Tommy Ellkvist
Issue Date:June 2009
pp. 1-2
Workflows are increasingly being used to specify computational tasks, from simulations and data analysis to the creation of Web mashups. Recently, a number of public workflow repositories have become available, for example, myExperiment for scientific work...
     
Siphon++: a hidden-webcrawler for keyword-based interfaces
Found in: Proceeding of the 17th ACM conference on Information and knowledge mining (CIKM '08)
By Altigran Silva, Juliana Freire, Karane Vieira, Luciano Barbosa
Issue Date:October 2008
pp. 1001-1001
The hidden Web consists of data that is generally hidden behind form interfaces, and as such, it is out of reach for traditional search engines. With the goal of leveraging the high-quality information in this largely unexplored portion of the Web, in this...
     
Provenance and scientific workflows: challenges and opportunities
Found in: Proceedings of the 2008 ACM SIGMOD international conference on Management of data (SIGMOD '08)
By Juliana Freire, Susan B. Davidson
Issue Date:June 2008
pp. 13-14
Provenance in the context of workflows, both for the data they derive and for their specification, is an essential component to allow for result reproducibility, sharing, and knowledge re-use in the scientific community. Several workshops have been held on...
     
Querying and re-using workflows with VsTrails
Found in: Proceedings of the 2008 ACM SIGMOD international conference on Management of data (SIGMOD '08)
By Carlos E. Scheidegger, Claudio T. Silva, David Koop, Huy T. Vo, Juliana Freire
Issue Date:June 2008
pp. 13-14
We show how work flow systems can be augmented to leverage provenance information to enhance usability. In particular, we will demonstrate new mechanisms and intuitive user interfaces designed to allow users to query work flows by example and to refine wor...
     
An adaptive crawler for locating hiddenwebentry points
Found in: Proceedings of the 16th international conference on World Wide Web (WWW '07)
By Juliana Freire, Luciano Barbosa
Issue Date:May 2007
pp. 441-450
In this paper we describe new adaptive crawling strategies to efficiently locate the entry points to hidden-Web sources. The fact that hidden-Web sources are very sparsely distributedmakes the problem of locating them especially challenging. We deal with t...
     
Combining classifiers to identify online databases
Found in: Proceedings of the 16th international conference on World Wide Web (WWW '07)
By Juliana Freire, Luciano Barbosa
Issue Date:May 2007
pp. 431-440
We address the problem of identifying the domain of onlinedatabases. More precisely, given a set F of Web forms automaticallygathered by a focused crawler and an online databasedomain D, our goal is to select from F only the formsthat are entry points to d...
     
A comprehensive solution to the XML-to-relational mapping problem
Found in: Proceedings of the 6th annual ACM international workshop on Web information and data management (WIDM '04)
By Fang Du, Juliana Freire, Sihem Amer-Yahia
Issue Date:November 2004
pp. 31-38
The use of relational database management systems (RDBMSs) to store and query XML data has attracted considerable interest with a view to leveraging their powerful and reliable data management services. Due to the mismatch between the relational and XML da...
     
WebViews: accessing personalized web content and services
Found in: Proceedings of the tenth international conference on World Wide Web (WWW '01)
By Bharat Kumar, Daniel Lieuwen, Juliana Freire
Issue Date:May 2001
pp. 576-586
This paper describes the challenges faced by designers in creating accessible systems for the elderly. CARSE, an assessment tool, which has been synthesized and empirically validated of the semantic efficacy of interface metaphor, is used to evaluate two s...
     
A layered architecture for querying dynamic Web content
Found in: Proceedings of the 1999 ACM SIGMOD international conference on Management of data (SIGMOD '99)
By Hasan Davulcu, I. V. Ramakrishnan, Juliana Freire, Michael Kifer
Issue Date:May 1999
pp. 358-367
The design of webbases, database systems for supporting Web-based applications, is currently an active area of research. In this paper, we propose a 3-year architecture for designing and implementing webbases for querying dynamic Web content(i.e., data tha...
     
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