publications

2024

1. Are Large Language Models Good Essay Graders?

   Anindita Kundu, and Denilson Barbosa

   2024

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2. IRJIT: A simple, online, information retrieval approach for just-in-time software defect prediction

   Hareem Sahar, Abdul Ali Bangash, Abram Hindle, and 1 more author

   Empir. Softw. Eng., 2024

   DOI PDF
3. Accurate and Nuanced Open-QA Evaluation Through Textual Entailment

   Peiran Yao, and Denilson Barbosa

   In Findings of the Association for Computational Linguistics ACL 2024, Aug 2024

   Abs PDF

   Open-domain question answering (Open-QA) is a common task for evaluating large language models (LLMs). However, current Open-QA evaluations are criticized for the ambiguity in questions and the lack of semantic understanding in evaluators. Complex evaluators, powered by foundation models or LLMs and pertaining to semantic equivalence, still deviate from human judgments by a large margin. We propose to study the entailment relations of answers to identify more informative and more general system answers, offering a much closer evaluation to human judgment on both NaturalQuestions and TriviaQA while being learning-free. The entailment-based evaluation we propose allows the assignment of bonus or partial marks by quantifying the inference gap between answers, enabling a nuanced ranking of answer correctness that has higher AUC than current methods.

4. Semantic Graphs for Syntactic Simplification: A Revisit from the Age of LLM

   Peiran Yao, Kostyantyn Guzhva, and Denilson Barbosa

   In Proceedings of TextGraphs-17: Graph-based Methods for Natural Language Processing, Aug 2024

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   Symbolic sentence meaning representations, such as AMR (Abstract Meaning Representation) provide expressive and structured semantic graphs that act as intermediates that simplify downstream NLP tasks. However, the instruction-following capability of large language models (LLMs) offers a shortcut to effectively solve NLP tasks, questioning the utility of semantic graphs. Meanwhile, recent work has also shown the difficulty of using meaning representations merely as a helpful auxiliary for LLMs. We revisit the position of semantic graphs in syntactic simplification, the task of simplifying sentence structures while preserving their meaning, which requires semantic understanding, and evaluate it on a new complex and natural dataset. The AMR-based method that we propose, AMRS^3, demonstrates that state-of-the-art meaning representations can lead to easy-to-implement simplification methods with competitive performance and unique advantages in cost, interpretability, and generalization. With AMRS^3 as an anchor, we discover that syntactic simplification is a task where semantic graphs are helpful in LLM prompting. We propose AMRCoC prompting that guides LLMs to emulate graph algorithms for explicit symbolic reasoning on AMR graphs, and show its potential for improving LLM on semantic-centered tasks like syntactic simplification.

5. Effective Trajectory Imputation using Simple Probabilistic Language Models

   H. Mohammed, M. A. Nascimento, and D. Barbosa

   In 2024 25th IEEE International Conference on Mobile Data Management (MDM), Jun 2024

   Abs DOI PDF

   Trajectory data collected by GPS has found many critical applications. Unfortunately, most trajectory datasets have missing data due to technical problems or due to the sampling strategy used. Trajectory imputation is the task of filling in the gaps in actual trajectories by computing points that fit "naturally" within existing trajectories. Considering that both trajectories and natural language are essentially sequences of symbols, we explore the use of probabilistic language models for trajectory imputation. Using a grid-based representation of the space, and not considering the underlying road network, we convert trajectory points into tokens corresponding to the grid cell where they appear and train models of different sizes. We report experiments on a real dataset of over 500,000 taxi trips, showing that we can accurately fill gaps of up to 2km between GPS observations with 83% precision. These results are comparable to approaches using much more computationally demanding Large Language Models based on transformers. We discuss why transformers are overkill for the task through experiments that show that trajectory data does not exhibit very long dependencies, as is the case with natural language.

6. Language Resources From Prominent Born-Digital Humanities Texts are Still Needed in the Age of LLMs

   Natalie Hervieux, Peiran Yao, Susan Brown, and 1 more author

   In Proceedings of the 4th International Conference on Natural Language Processing for Digital Humanities, Nov 2024

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   The digital humanities (DH) community fundamentally embraces the use of computerized tools for the study and creation of knowledge related to language, history, culture, and human values, in which natural language plays a prominent role. Many successful DH tools rely heavily on Natural Language Processing methods, and several efforts exist within the DH community to promote the use of newer and better tools. Nevertheless, most NLP research is driven by web corpora that are noticeably different from texts commonly found in DH artifacts, which tend to use richer language and refer to rarer entities. Thus, the near-human performance achieved by state-of-the-art NLP tools on web texts might not be achievable on DH texts. We introduce a dataset carefully created by computer scientists and digital humanists intended to serve as a reference point for the development and evaluation of NLP tools. The dataset is a subset of a born-digital textbase resulting from a prominent and ongoing experiment in digital literary history, containing thousands of multi-sentence excerpts that are suited for information extraction tasks. We fully describe the dataset and show that its language is demonstrably different than the corpora normally used in training language resources in the NLP community.

7. Improving Bengali and Hindi Large Language Models

   Arif Shahriar, and Denilson Barbosa

   In Proceedings of the 2024 Joint International Conference on Computational Linguistics, Language Resources and Evaluation (LREC-COLING 2024), May 2024

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   Despite being widely spoken worldwide, Bengali and Hindi are low-resource languages. The state-of-the-art in modeling such languages uses BERT and the Wordpiece tokenizer. We observed that the Wordpiece tokenizer often breaks words into meaningless tokens, failing to separate roots from affixes. Moreover, Wordpiece does not take into account fine-grained character-level information. We hypothesize that modeling fine-grained character-level information or interactions between roots and affixes helps with modeling highly inflected and morphologically complex languages such as Bengali and Hindi. We used BERT with two different tokenizers - a Unigram tokenizer and a character-level tokenizer and observed better performance. Then, we pretrained four language models accordingly - Bengali Unigram BERT, Hindi Unigram BERT, Bengali Character BERT, and Hindi Character BERT, and evaluated them for masked token detection, both in correct and erroneous settings, across many NLU tasks. We provide experimental evidence that Unigram and character-level tokenizers lead to better pretrained models for Bengali and Hindi, outperforming the previous state-of-the-art and BERT with Wordpiece vocabulary. We conduct the first study investigating the efficacy of different tokenization methods in modeling Bengali and Hindi.

8. Instant Messaging Platforms News Multi-Task Classification for Stance, Sentiment, and Discrimination Detection

   Taras Ustyianovych, and Denilson Barbosa

   In Proceedings of the Third Ukrainian Natural Language Processing Workshop (UNLP) @ LREC-COLING 2024, May 2024

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   In the digital age, geopolitical events frequently catalyze discussions among global web users. Platforms such as social networks and messaging applications serve as vital means for information spreading and acquisition. The Russian aggression against Ukraine has notably intensified online discourse on the matter, drawing a significant audience eager for real-time updates. This surge in online activity inevitably results in the proliferation of content, some of which may be unreliable or manipulative. Given this context, the identification of such content with information distortion is imperative to mitigate bias and promote fairness. However, this task presents considerable challenges, primarily due to the lack of sophisticated language models capable of understanding the nuances and context of texts in low-resource languages, and the scarcity of well-annotated datasets for training such models. To address these gaps, we introduce the TRWU dataset - a meticulously annotated collection of Telegram news about the Russian war in Ukraine gathered starting from January 1, 2022. This paper outlines our methodology for semantic analysis and classification of these messages, aiming to ascertain their bias. Such an approach enhances our ability to detect manipulative and destructive content. Through descriptive statistical analysis, we explore deviations in message sentiment, stance, and metadata across different types of channels and levels of content creation activity. Our findings indicate a predominance of negative sentiment within the dataset. Additionally, our research elucidates distinct differences in the linguistic choices and phraseology among channels, based on their stance towards the war. This study contributes to the broader effort of understanding the spread and mitigating the impact of biased and manipulative content in digital communications.

2023

1. NLP Workbench: Efficient and Extensible Integration of State-of-the-art Text Mining Tools

   Peiran Yao, Matej Kosmajac, Abeer Waheed, and 3 more authors

   In Proceedings of the 17th Conference of the European Chapter of the Association for Computational Linguistics: System Demonstrations, May 2023

   Abs Bib PDF

   NLP Workbench is a web-based platform for text mining that allows non-expert users to obtain semantic understanding of large-scale corpora using state-of-the-art text mining models. The platform is built upon latest pre-trained models and open source systems from academia that provide semantic analysis functionalities, including but not limited to entity linking, sentiment analysis, semantic parsing, and relation extraction. Its extensible design enables researchers and developers to smoothly replace an existing model or integrate a new one. To improve efficiency, we employ a microservice architecture that facilitates allocation of acceleration hardware and parallelization of computation. This paper presents the architecture of NLP Workbench and discusses the challenges we faced in designing it. We also discuss diverse use cases of NLP Work- bench and the benefits of using it over other approaches. The platform is under active devel- opment, with its source code released under the MIT license. A website and a short video demonstrating our platform are also available.

   @inproceedings{yao-etal-2023-nlp,
     title = {{NLP} Workbench: Efficient and Extensible Integration of State-of-the-art Text Mining Tools},
     author = {Yao, Peiran and Kosmajac, Matej and Waheed, Abeer and Guzhva, Kostyantyn and Hervieux, Natalie and Barbosa, Denilson},
     booktitle = {Proceedings of the 17th Conference of the European Chapter of the Association for Computational Linguistics: System Demonstrations},
     month = may,
     year = {2023},
     address = {Dubrovnik, Croatia},
     publisher = {Association for Computational Linguistics},
     pages = {18--26},
     bibtex_show = true
   }

2. Relational Extraction on Wikipedia Tables using Convolutional and Memory Networks

   Arif Shahriar, Rohan Saha, and Denilson Barbosa

   CoRR, May 2023

   DOI Bib PDF

   @article{DBLP:journals/corr/abs-2307-05827,
     author = {Shahriar, Arif and Saha, Rohan and Barbosa, Denilson},
     title = {Relational Extraction on Wikipedia Tables using Convolutional and
                       Memory Networks},
     journal = {CoRR},
     volume = {abs/2307.05827},
     year = {2023},
     doi = {10.48550/arXiv.2307.05827},
     eprinttype = {arXiv},
     eprint = {2307.05827},
     timestamp = {Mon, 28 Aug 2023 21:26:19 +0200},
     biburl = {https://dblp.org/rec/journals/corr/abs-2307-05827.bib},
     bibsource = {dblp computer science bibliography, https://dblp.org},
     bibtex_show = true
   }

2022

1. WordTies: Measuring Word Associations in Language Models via Constrained Sampling

   Peiran Yao, Tobias Renwick, and Denilson Barbosa

   In Findings of the Association for Computational Linguistics: EMNLP 2022, Dec 2022

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   Word associations are widely used in psychology to provide insights on how humans perceive and understand concepts. Comparing word associations in language models (LMs) to those generated by human subjects can serve as a proxy to uncover embedded lexical and commonsense knowledge in language models. While much helpful work has been done applying direct metrics, such as cosine similarity, to help understand latent spaces, these metrics are symmetric, while human word associativity is asymmetric. We propose WordTies, an algorithm based on constrained sampling from LMs, which allows an asymmetric measurement of associated words, given a cue word as the input. Comparing to existing methods, word associations found by this method share more overlap with associations provided by humans, and observe the asymmetric property of human associations. To examine possible reasons behind associations, we analyze the knowledge and reasoning behind the word pairings as they are linked to lexical and commonsense knowledge graphs.When the knowledge about the nature of the word pairings is combined with a probability that the LM has learned that information, we have a new way to examine what information is captured in LMs.

   @inproceedings{yao-etal-2022-wordties,
     title = {{W}ord{T}ies: Measuring Word Associations in Language Models via Constrained Sampling},
     author = {Yao, Peiran and Renwick, Tobias and Barbosa, Denilson},
     booktitle = {Findings of the Association for Computational Linguistics: EMNLP 2022},
     month = dec,
     year = {2022},
     address = {Abu Dhabi, United Arab Emirates},
     publisher = {Association for Computational Linguistics},
     pages = {5959--5970},
     bibtex_show = true
   }

2. Cree Corpus: A Collection of nêhiyawêwin Resources

   Daniela Teodorescu, Josie Matalski, Delaney Lothian, and 2 more authors

   In Proceedings of the 60th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers), May 2022

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   Plains Cree (nêhiyawêwin) is an Indigenous language that is spoken in Canada and the USA. It is the most widely spoken dialect of Cree and a morphologically complex language that is polysynthetic, highly inflective, and agglutinative. It is an extremely low resource language, with no existing corpus that is both available and prepared for supporting the development of language technologies. To support nêhiyawêwin revitalization and preservation, we developed a corpus covering diverse genres, time periods, and texts for a variety of intended audiences. The data has been verified and cleaned; it is ready for use in developing language technologies for nêhiyawêwin. The corpus includes the corresponding English phrases or audio files where available. We demonstrate the utility of the corpus through its community use and its use to build language technologies that can provide the types of support that community members have expressed are desirable. The corpus is available for public use.

   @inproceedings{teodorescu-etal-2022-cree,
     title = {{C}ree Corpus: A Collection of n{\^e}hiyaw{\^e}win Resources},
     author = {Teodorescu, Daniela and Matalski, Josie and Lothian, Delaney and Barbosa, Denilson and Demmans Epp, Carrie},
     booktitle = {Proceedings of the 60th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)},
     month = may,
     year = {2022},
     address = {Dublin, Ireland},
     publisher = {Association for Computational Linguistics},
     doi = {10.18653/v1/2022.acl-long.440},
     pages = {6354--6364},
     bibtex_show = true
   }

3. HOPLoP: Multi-Hop Link Prediction over Knowledge Graph Embeddings

   Varun Ranganathan, and Denilson Barbosa

   World Wide Web, Mar 2022

   Abs DOI Bib PDF

   Large-scale Knowledge Graphs (KGs) support applications such as Web search and personal assistants and provide training data for numerous Natural Language Processing tasks. Nevertheless, building KGs with high accuracy and domain coverage remains difficult, and neither manual nor automatic efforts are up to par. Link Prediction (LP) is one of many tasks aimed at addressing this problem. Its goal is to find missing links between entities in the KG based on structural by exploiting regularities in the graph structure. Recent years have seen two approaches emerge: using KG embeddings, and modelling complex relations by exploiting correlations between individual links and longer paths connecting the same pair of entities. For the latter, state-of-the-art methods traverse the KG itself and are hampered both by incompleteness and skewed degree distributions found in most KGs, resulting in some entities being overly represented in the training set leading to poor generalization. We present HOPLoP: an efficient and effective multi-hop LP meta method that performs the equivalent to path traversals on the KG embedding space instead of the KG itself, marrying both ideas. We show how to train and tune our method with different underlying KG embeddings, and report on experiments on many benchmarks, showing both that HOPLoP improves each LP method on its own and that it consistently outperforms the previous state-of-the-art by a good margin. Finally, we describe a way to interpret paths generated by HOPLoP when used with TransE.

   @article{RanganathanB22,
     author = {Ranganathan, Varun and Barbosa, Denilson},
     title = {HOPLoP: Multi-Hop Link Prediction over Knowledge Graph Embeddings},
     year = {2022},
     publisher = {Kluwer Academic Publishers},
     address = {USA},
     volume = {25},
     number = {2},
     issn = {1386-145X},
     doi = {10.1007/s11280-021-00972-6},
     journal = {World Wide Web},
     month = mar,
     pages = {1037–1065},
     numpages = {29},
     keywords = {Link Prediction, Knowledge Graph Embeddings, Multi-hop reasoning},
     bibtex_show = true
   }

4. The Effect of Fine-tuned Word Embedding Techniques on the Accuracy of Automated Essay Scoring Systems Using Neural Networks

   Tahereh Firoozi, Okan Bulut , Carrie Demmans Epp, and 2 more authors

   Journal of Applied Testing Technology, Mar 2022

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   Automated Essay Scoring (AES) using neural networks has helped increase the accuracy and efficiency of scoring students’ written tasks. Generally, the improved accuracy of neural network approaches has been attributed to the use of modern word embedding techniques. However, which word embedding techniques produce higher accuracy in AES systems with neural networks is still unclear. In addition, the importance of fine-tuned word embedding techniques on the accuracy of the AES systems is not justified yet. This study investigates the effect of fine-tuned modern word embedding techniques, including pretrained GloVe and Word2Vec, on the accuracy of a deep learning AES model using a Long-Short Term Memory (LSTM) network. The dataset used in this study consisted of 12,978 essays introduced in the 2012 Automated Scoring Assessment Prize (ASAP) competition. Results show that fine-tuned word embedding techniques could significantly improve the accuracy of the AES (QWK= 0.79) compared with the baseline model without pretrained embeddings (QWK = 0.73). Moreover, when used in AES, the pre-trained GloVe word embedding (QWK= 0.79) outperformed Word2Vec (QWK = 0.77). The results of this study can guide future AES studies in selecting more appropriate word representations and how to fine-tune the word embedding techniques for scoring-related tasks.

   @article{JATT2022,
     author = {Firoozi, Tahereh and Bulut, Okan and Epp, Carrie Demmans and Naeimabadi, Ali and Barbosa, Denilson},
     title = {The Effect of Fine-tuned Word Embedding Techniques on the Accuracy of Automated Essay Scoring Systems Using Neural Networks},
     journal = {Journal of Applied Testing Technology},
     volume = {23},
     number = {0},
     pages = {21–29},
     year = {2022},
     keywords = {Automated Essay Scoring, Glove Embedding, Neural Networks, Word Embeddings, Word2Vec},
     bibtex_show = true
   }

5. Energy to contest? Emotional and multimodal contestation of energy markets

   Lianne M. Lefsrud, Candelario A. Gutierrez Gutierrez, Eleni Stroulia, and 2 more authors

   In Proceedings of the 38th EGOS Colloquium, Mar 2022

   Bib

   @inproceedings{AI4BuzEGOS2022,
     author = {Lefsrud, Lianne M. and Gutierrez, Candelario A. Gutierrez and Stroulia, Eleni and Gehman, Joel and Barbosa, Denilson},
     title = {Energy to contest? Emotional and multimodal contestation of energy markets},
     booktitle = {Proceedings of the 38th EGOS Colloquium},
     publisher = { European Group for Organizational Studies},
     year = {2022},
     bibtex_show = true
   }

6. Web Services for Voyant: LINCS, Voyant and NSS

   Geoffrey Rockwell, Natalie Hervieux, Huma Zafar, and 6 more authors

   In Proceedings of DIGITAL HUMANITIES 2022, Mar 2022

   Bib

   @inproceedings{DH2022,
     author = {Rockwell, Geoffrey and Hervieux, Natalie and Zafar, Huma and Land, Kaylin and MacDonald, Andrew and Barbosa, Denilson and Frizzera, Luciano and Ilovan, Mihaela and Brown, Susan},
     title = {Web Services for Voyant: LINCS, Voyant and NSS},
     booktitle = {Proceedings of DIGITAL HUMANITIES 2022},
     year = {2022},
     publisher = {Carnegie Mellon University Press},
     bibtex_show = true
   }

2021

1. Knowledge Graph Embedding for Link Prediction: A Comparative Analysis

   Andrea Rossi, Denilson Barbosa, Donatella Firmani, and 2 more authors

   ACM Trans. Knowl. Discov. Data, Jan 2021

   Abs DOI Bib PDF

   Knowledge Graphs (KGs) have found many applications in industrial and in academic settings, which in turn, have motivated considerable research efforts towards large-scale information extraction from a variety of sources. Despite such efforts, it is well known that even the largest KGs suffer from incompleteness; Link Prediction (LP) techniques address this issue by identifying missing facts among entities already in the KG. Among the recent LP techniques, those based on KG embeddings have achieved very promising performance in some benchmarks. Despite the fast-growing literature on the subject, insufficient attention has been paid to the effect of the design choices in those methods. Moreover, the standard practice in this area is to report accuracy by aggregating over a large number of test facts in which some entities are vastly more represented than others; this allows LP methods to exhibit good results by just attending to structural properties that include such entities, while ignoring the remaining majority of the KG. This analysis provides a comprehensive comparison of embedding-based LP methods, extending the dimensions of analysis beyond what is commonly available in the literature. We experimentally compare the effectiveness and efficiency of 18 state-of-the-art methods, consider a rule-based baseline, and report detailed analysis over the most popular benchmarks in the literature.

   @article{RossiBFMM21,
     author = {Rossi, Andrea and Barbosa, Denilson and Firmani, Donatella and Matinata, Antonio and Merialdo, Paolo},
     title = {Knowledge Graph Embedding for Link Prediction: A Comparative Analysis},
     year = {2021},
     publisher = {Association for Computing Machinery},
     address = {New York, NY, USA},
     volume = {15},
     number = {2},
     issn = {1556-4681},
     doi = {10.1145/3424672},
     journal = {ACM Trans. Knowl. Discov. Data},
     month = jan,
     articleno = {14},
     numpages = {49},
     keywords = {knowledge graph embeddings, link prediction, Knowledge graphs, comparative analysis},
     bibtex_show = true
   }

2. Typing Errors in Factual Knowledge Graphs: Severity and Possible Ways Out

   Peiran Yao, and Denilson Barbosa

   In WWW ’21: The Web Conference 2021, Virtual Event / Ljubljana, Slovenia, April 19-23, 2021, Jan 2021

   DOI Bib PDF

   @inproceedings{YaoB21,
     author = {Yao, Peiran and Barbosa, Denilson},
     editor = {Leskovec, Jure and Grobelnik, Marko and Najork, Marc and Tang, Jie and Zia, Leila},
     title = {Typing Errors in Factual Knowledge Graphs: Severity and Possible Ways
                    Out},
     booktitle = {{WWW} '21: The Web Conference 2021, Virtual Event / Ljubljana, Slovenia,
                    April 19-23, 2021},
     pages = {3305--3313},
     publisher = {{ACM} / {IW3C2}},
     year = {2021},
     doi = {10.1145/3442381.3449977},
     timestamp = {Mon, 07 Jun 2021 14:20:06 +0200},
     biburl = {https://dblp.org/rec/conf/www/YaoB21.bib},
     bibsource = {dblp computer science bibliography, https://dblp.org},
     bibtex_show = true
   }

3. Detection and Identification of Obfuscated Obscene Language with Character Level Transformers

   Tobias Renwick, and Denilson Barbosa

   In Proceedings of the 34th Canadian Conference on Artificial Intelligence, Canadian AI 2021, Jan 2021

   Bib

   @inproceedings{RenwickBarbosa21,
     author = {Renwick, Tobias and Barbosa, Denilson},
     title = {Detection and Identification of Obfuscated Obscene Language with Character Level Transformers},
     booktitle = {Proceedings of the 34th Canadian Conference on Artificial Intelligence, Canadian {AI} 2021},
     pages = {8 pp},
     year = {2021},
     bibtex_show = true
   }

4. Analyzing and visualizing Twitter conversations

   Candelario A. Gutierrez Gutierrez, Andrea M. Whittaker, Katherine Mae Patenio, and 4 more authors

   In CASCON ’21: Proceedings of the 31st Annual International Conference on Computer Science and Software Engineering, Toronto, Ontario, Canada, November 22 - 25, 2021, Jan 2021

   DOI Bib PDF

   @inproceedings{GutierrezWPGLBS21,
     author = {Gutierrez, Candelario A. Gutierrez and Whittaker, Andrea M. and Patenio, Katherine Mae and Gehman, Joel and Lefsrud, Lianne M. and Barbosa, Denilson and Stroulia, Eleni},
     title = {Analyzing and visualizing Twitter conversations},
     booktitle = {{CASCON} '21: Proceedings of the 31st Annual International Conference
                    on Computer Science and Software Engineering, Toronto, Ontario, Canada,
                    November 22 - 25, 2021},
     pages = {4--13},
     publisher = {{ACM}},
     year = {2021},
     doi = {10.5555/3507788.3507791},
     bibtex_show = true
   }

2020

1. Neural Relation Extraction on Wikipedia Tables for Augmenting Knowledge Graphs

   Erin Macdonald, and Denilson Barbosa

   In Proceedings of the 29th ACM International Conference on Information & Knowledge Management, Jan 2020

   Abs Bib PDF

   Knowledge Graph Augmentation is the task of adding missing facts to an incomplete knowledge graph to improve its effectiveness in applications such as web search and question answering. State-of-the-art methods rely on information extraction from running text, leaving rich sources of facts such as tables behind. We help close this gap with a neural method that uses contextual information surrounding a table in a Wikipedia article to extract relations between entities appearing in the same row of a table or between the entity of said article and entities appearing in the table. We trained and tested our method on a much larger dataset compared to previous work which we have made public and observed experimentally that our method is very promising for the task.

   @inproceedings{cikm2020,
     author = {Macdonald, Erin and Barbosa, Denilson},
     title = {Neural Relation Extraction on Wikipedia Tables for Augmenting Knowledge Graphs},
     year = {2020},
     isbn = {9781450368599},
     publisher = {Association for Computing Machinery},
     address = {New York, NY, USA},
     booktitle = {Proceedings of the 29th ACM International Conference on Information {\&} Knowledge Management},
     pages = {2133–2136},
     numpages = {4},
     bibtex_show = true
   }

2. Understanding DevOps Education with Grounded Theory

   Candy Pang, Abram Hindle, and Denilson Barbosa

   In Proceedings of the 41st International Conference on Software Engineering: Software Engineering Education and Training, Jan 2020

   Bib PDF

   @inproceedings{icse2020,
     author = {Pang, Candy and Hindle, Abram and Barbosa, Denilson},
     title = {Understanding DevOps Education with Grounded Theory},
     booktitle = {Proceedings of the 41st International Conference on Software Engineering: Software Engineering Education and Training},
     year = {2020},
     bibtex_show = true
   }

3. GrCluster: a score function to model hierarchy in knowledge graph embeddings

   Varun Ranganathan, Siddharth Suresh, Yash Mathur, and 2 more authors

   In SAC ’20: The 35th ACM/SIGAPP Symposium on Applied Computing, online event, [Brno, Czech Republic], March 30 - April 3, 2020, Jan 2020

   DOI Bib PDF

   @inproceedings{sac_RanganathanSMSB20,
     author = {Ranganathan, Varun and Suresh, Siddharth and Mathur, Yash and Subramanyam, Natarajan and Barbosa, Denilson},
     editor = {Hung, Chih{-}Cheng and Cern{\'{y}}, Tom{\'{a}}s and Shin, Dongwan and Bechini, Alessio},
     title = {GrCluster: a score function to model hierarchy in knowledge graph
                    embeddings},
     booktitle = {{SAC} '20: The 35th {ACM/SIGAPP} Symposium on Applied Computing, online
                    event, [Brno, Czech Republic], March 30 - April 3, 2020},
     pages = {964--971},
     publisher = {{ACM}},
     year = {2020},
     doi = {10.1145/3341105.3373978},
     timestamp = {Thu, 02 Apr 2020 17:08:04 +0200},
     biburl = {https://dblp.org/rec/conf/sac/RanganathanSMSB20.bib},
     bibsource = {dblp computer science bibliography, https://dblp.org},
     bibtex_show = true
   }

4. Knowledge Graph Embedding for Link Prediction: A Comparative Analysis

   Andrea Rossi, Donatella Firmani, Antonio Matinata, and 2 more authors

   CoRR, Jan 2020

   Bib PDF

   @article{corr_abs-2002-00819,
     author = {Rossi, Andrea and Firmani, Donatella and Matinata, Antonio and Merialdo, Paolo and Barbosa, Denilson},
     title = {Knowledge Graph Embedding for Link Prediction: {A} Comparative Analysis},
     journal = {CoRR},
     volume = {abs/2002.00819},
     year = {2020},
     archiveprefix = {arXiv},
     eprint = {2002.00819},
     timestamp = {Mon, 10 Feb 2020 15:12:57 +0100},
     biburl = {https://dblp.org/rec/journals/corr/abs-2002-00819.bib},
     bibsource = {dblp computer science bibliography, https://dblp.org},
     bibtex_show = true
   }

2019

1. KnowledgeNet: A Benchmark Dataset for Knowledge Base Population

   Filipe Mesquita, Matteo Cannaviccio, Jordan Schmidek, and 2 more authors

   In Proceedings of the 2019 Conference on Empirical Methods in Natural Language Processing and the 9th International Joint Conference on Natural Language Processing (EMNLP-IJCNLP), Nov 2019

   Abs DOI Bib PDF

   KnowledgeNet is a benchmark dataset for the task of automatically populating a knowledge base (Wikidata) with facts expressed in natural language text on the web. KnowledgeNet provides text exhaustively annotated with facts, thus enabling the holistic end-to-end evaluation of knowledge base population systems as a whole, unlike previous benchmarks that are more suitable for the evaluation of individual subcomponents (e.g., entity linking, relation extraction). We discuss five baseline approaches, where the best approach achieves an F1 score of 0.50, significantly outperforming a traditional approach by 79% (0.28). However, our best baseline is far from reaching human performance (0.82), indicating our dataset is challenging. The KnowledgeNet dataset and baselines are available at https://github.com/diffbot/knowledge-net

   @inproceedings{emnlp2019_KnowledgeNet,
     title = {{K}nowledge{N}et: A Benchmark Dataset for Knowledge Base Population},
     author = {Mesquita, Filipe and Cannaviccio, Matteo and Schmidek, Jordan and Mirza, Paramita and Barbosa, Denilson},
     booktitle = {Proceedings of the 2019 Conference on Empirical Methods in Natural Language Processing and the 9th International Joint Conference on Natural Language Processing (EMNLP-IJCNLP)},
     month = nov,
     year = {2019},
     address = {Hong Kong, China},
     publisher = {Association for Computational Linguistics},
     doi = {10.18653/v1/D19-1069},
     pages = {749--758},
     bibtex_show = true
   }

2. Detecting and Correcting Typing Errors in DBpedia

   Daniel Caminhas, Daniel Cones, Natalie Hervieux, and 1 more author

   In Proceedings of the 1st International Workshop on Challenges and Experiences from Data Integration to Knowledge Graphs co-located with the 25th ACM SIGKDD International Conference on Knowledge Discovery & Data Mining (KDD 2019), Anchorage, Alaska, August 5, 2019, Nov 2019

   Bib PDF

   @inproceedings{kdd_CaminhasCHB19,
     author = {Caminhas, Daniel and Cones, Daniel and Hervieux, Natalie and Barbosa, Denilson},
     editor = {Firmani, Donatella and Crescenzi, Valter and Angelis, Andrea De and Dong, Xin Luna and Mazzei, Maurizio and Merialdo, Paolo and Srivastava, Divesh},
     title = {Detecting and Correcting Typing Errors in DBpedia},
     booktitle = {Proceedings of the 1st International Workshop on Challenges and Experiences
                    from Data Integration to Knowledge Graphs co-located with the 25th
                    {ACM} {SIGKDD} International Conference on Knowledge Discovery {\&}
                    Data Mining {(KDD} 2019), Anchorage, Alaska, August 5, 2019},
     series = {{CEUR} Workshop Proceedings},
     volume = {2512},
     publisher = {CEUR-WS.org},
     year = {2019},
     timestamp = {Wed, 12 Feb 2020 16:44:16 +0100},
     biburl = {https://dblp.org/rec/conf/kdd/CaminhasCHB19.bib},
     bibsource = {dblp computer science bibliography, https://dblp.org},
     bibtex_show = true
   }

3. Detecting and Correcting Typing Errors in DBpedia

   Daniel Caminhas, Daniel Cones, Natalie Hervieux, and 1 more author

   In Proceedings of the International Workshop on Challenges and Experiences From Data Integration to Knowledge Graphs, Nov 2019

   Bib

   @inproceedings{di2kg2019_Caminhas,
     author = {Caminhas, Daniel and Cones, Daniel and Hervieux, Natalie and Barbosa, Denilson},
     title = {Detecting and Correcting Typing Errors in DBpedia},
     pages = {4pp},
     year = {2019},
     booktitle = {Proceedings of the International Workshop on Challenges and Experiences From Data Integration to Knowledge Graphs},
     publisher = {ACM},
     bibtex_show = true
   }

4. Connecting Language and Knowledge with Heterogeneous Representations for Neural Relation Extraction (preprint)

   Peng Xu, and Denilson Barbosa

   CoRR, Nov 2019

   Bib PDF

   @article{Corr_abs-1903-10126,
     author = {Xu, Peng and Barbosa, Denilson},
     title = {Connecting Language and Knowledge with Heterogeneous Representations
                    for Neural Relation Extraction (preprint)},
     journal = {CoRR},
     volume = {abs/1903.10126},
     year = {2019},
     archiveprefix = {arXiv},
     eprint = {1903.10126},
     timestamp = {Mon, 01 Apr 2019 14:07:37 +0200},
     biburl = {https://dblp.org/rec/bib/journals/corr/abs-1903-10126},
     bibsource = {dblp computer science bibliography, https://dblp.org},
     bibtex_show = true
   }

5. Connecting Language and Knowledge with Heterogeneous Representations for Neural Relation Extraction

   Peng Xu, and Denilson Barbosa

   In Proceedings of the 2019 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies, Volume 1 (Long and Short Papers), Jun 2019

   Abs Bib PDF

   Knowledge Bases (KBs) require constant updating to reflect changes to the world they represent. For general purpose KBs, this is often done through Relation Extraction (RE), the task of predicting KB relations expressed in text mentioning entities known to the KB. One way to improve RE is to use KB Embeddings (KBE) for link prediction. However, despite clear connections between RE and KBE, little has been done toward properly unifying these models systematically. We help close the gap with a framework that unifies the learning of RE and KBE models leading to significant improvements over the state-of-the-art in RE. The code is available at https://github.com/billy-inn/HRERE.

   @inproceedings{xu-barbosa-2019-connecting,
     title = {Connecting Language and Knowledge with Heterogeneous Representations for Neural Relation Extraction},
     author = {Xu, Peng and Barbosa, Denilson},
     booktitle = {Proceedings of the 2019 Conference of the North {A}merican Chapter of the Association for Computational Linguistics: Human Language Technologies, Volume 1 (Long and Short Papers)},
     month = jun,
     year = {2019},
     address = {Minneapolis, Minnesota},
     publisher = {Association for Computational Linguistics},
     pages = {3201--3206},
     bibtex_show = true
   }

2018

1. Neural Fine-Grained Entity Type Classification with Hierarchy-Aware Loss

   Peng Xu, and Denilson Barbosa

   In Proceedings of the 2018 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies, Volume 1 (Long Papers), Jun 2018

   Abs DOI Bib PDF

   The task of Fine-grained Entity Type Classification (FETC) consists of assigning types from a hierarchy to entity mentions in text. Existing methods rely on distant supervision and are thus susceptible to noisy labels that can be out-of-context or overly-specific for the training sentence. Previous methods that attempt to address these issues do so with heuristics or with the help of hand-crafted features. Instead, we propose an end-to-end solution with a neural network model that uses a variant of cross-entropy loss function to handle out-of-context labels, and hierarchical loss normalization to cope with overly-specific ones. Also, previous work solve FETC a multi-label classification followed by ad-hoc post-processing. In contrast, our solution is more elegant: we use public word embeddings to train a single-label that jointly learns representations for entity mentions and their context. We show experimentally that our approach is robust against noise and consistently outperforms the state-of-the-art on established benchmarks for the task.

   @inproceedings{xu-barbosa-2018-neural,
     title = {Neural Fine-Grained Entity Type Classification with Hierarchy-Aware Loss},
     author = {Xu, Peng and Barbosa, Denilson},
     booktitle = {Proceedings of the 2018 Conference of the North {A}merican Chapter of the Association for Computational Linguistics: Human Language Technologies, Volume 1 (Long Papers)},
     month = jun,
     year = {2018},
     address = {New Orleans, Louisiana},
     publisher = {Association for Computational Linguistics},
     doi = {10.18653/v1/N18-1002},
     pages = {16--25},
     bibtex_show = true
   }

2. Investigations on Knowledge Base Embedding for Relation Prediction and Extraction

   Peng Xu, and Denilson Barbosa

   CoRR, Jun 2018

   Bib PDF

   @article{Corr_abs-1802-02114,
     author = {Xu, Peng and Barbosa, Denilson},
     title = {Investigations on Knowledge Base Embedding for Relation Prediction
                    and Extraction},
     journal = {CoRR},
     volume = {abs/1802.02114},
     year = {2018},
     archiveprefix = {arXiv},
     eprint = {1802.02114},
     bibtex_show = true
   }

3. Neural Fine-Grained Entity Type Classification with Hierarchy-Aware Loss (Preprint)

   Peng Xu, and Denilson Barbosa

   CoRR, Jun 2018

   Bib PDF

   @article{Corr_abs-1803-03378,
     author = {Xu, Peng and Barbosa, Denilson},
     title = {Neural Fine-Grained Entity Type Classification with Hierarchy-Aware Loss (Preprint)},
     journal = {CoRR},
     volume = {abs/1803.03378},
     year = {2018},
     archiveprefix = {arXiv},
     eprint = {1803.03378},
     bibtex_show = true
   }

4. Leveraging Wikipedia Table Schemas for Knowledge Graph Augmentation

   Matteo Cannaviccio, Lorenzo Ariemma, Denilson Barbosa, and 1 more author

   In Proceedings of the 21st International Workshop on Web and Databases, Houston, TX, USA, June 10th, 2018, Jun 2018

   Bib PDF

   @inproceedings{CannaviccioABM_WebDB2018,
     author = {Cannaviccio, Matteo and Ariemma, Lorenzo and Barbosa, Denilson and Merialdo, Paolo},
     title = {Leveraging Wikipedia Table Schemas for Knowledge Graph Augmentation},
     booktitle = {Proceedings of the 21st International Workshop on Web and Databases,
                    Houston, TX, USA, June 10th, 2018},
     pages = {5:1-5:6},
     publisher = {{ACM}},
     year = {2018},
     bibtex_show = true
   }

5. Matching Resumes to Job Descriptions with Stacked Models

   Peng Xu, and Denilson Barbosa

   In Advances in Artificial Intelligence - 31st Canadian Conference on Artificial Intelligence, Canadian AI 2018, Toronto, ON, Canada, May 8-11, 2018, Proceedings, Jun 2018

   DOI Bib

   @inproceedings{XuBarbosa_CanAI_2018,
     author = {Xu, Peng and Barbosa, Denilson},
     title = {Matching Resumes to Job Descriptions with Stacked Models},
     booktitle = {Advances in Artificial Intelligence - 31st Canadian Conference on
                    Artificial Intelligence, Canadian {AI} 2018, Toronto, ON, Canada,
                    May 8-11, 2018, Proceedings},
     pages = {304--309},
     year = {2018},
     doi = {10.1007/978-3-319-89656-4_31},
     bibtex_show = true
   }

6. Towards Annotating Relational Data on the Web with Language Models

   Matteo Cannaviccio, Denilson Barbosa, and Paolo Merialdo

   In Proceedings of The Web Conference 2018, Jun 2018

   DOI Bib PDF

   @inproceedings{Cannaviccio_et_al_2018,
     author = {Cannaviccio, Matteo and Barbosa, Denilson and Merialdo, Paolo},
     title = {Towards Annotating Relational Data on the Web with Language Models},
     booktitle = {Proceedings of The Web Conference 2018},
     pages = {1307--1316},
     year = {2018},
     doi = {10.1145/3178876.3186029},
     bibtex_show = true
   }

7. Robust named entity disambiguation with random walks

   Zhaochen Guo, and Denilson Barbosa

   Semantic Web, Jun 2018

   DOI Bib PDF

   @article{Guo_Barbosa_2018,
     author = {Guo, Zhaochen and Barbosa, Denilson},
     title = {Robust named entity disambiguation with random walks},
     journal = {Semantic Web},
     volume = {9},
     number = {4},
     pages = {459--479},
     year = {2018},
     doi = {10.3233/SW-170273},
     bibtex_show = true
   }

2016

1. Relationship Queries on Extended Knowledge Graphs

   Mohamed Yahya, Denilson Barbosa, Klaus Berberich, and 2 more authors

   In Proceedings of the Ninth ACM International Conference on Web Search and Data Mining, San Francisco, CA, USA, February 22-25, 2016, Jun 2016

   DOI Bib PDF

   @inproceedings{Yahya_etal_WSDM2016,
     author = {Yahya, Mohamed and Barbosa, Denilson and Berberich, Klaus and Wang, Qiuyue and Weikum, Gerhard},
     title = {Relationship Queries on Extended Knowledge Graphs},
     booktitle = {Proceedings of the Ninth {ACM} International Conference on Web Search
                    and Data Mining, San Francisco, CA, USA, February 22-25, 2016},
     pages = {605--614},
     publisher = {{ACM}},
     year = {2016},
     doi = {10.1145/2835776.2835795},
     timestamp = {Mon, 08 Feb 2016 15:38:27 +0100},
     biburl = {http://dblp.uni-trier.de/rec/bib/conf/wsdm/YahyaBBWW16},
     bibsource = {dblp computer science bibliography, http://dblp.org},
     bibtex_show = true
   }

2. Hadoop energy consumption reduction with hybrid HDFS

   Ivanilton Polato, Denilson Barbosa, Abram Hindle, and 1 more author

   In Proceedings of the 31st Annual ACM Symposium on Applied Computing, Pisa, Italy, April 4-8, 2016, Jun 2016

   DOI Bib

   @inproceedings{PolatoBHK_SAC2016,
     author = {Polato, Ivanilton and Barbosa, Denilson and Hindle, Abram and Kon, Fabio},
     editor = {Ossowski, Sascha},
     title = {Hadoop energy consumption reduction with hybrid {HDFS}},
     booktitle = {Proceedings of the 31st Annual {ACM} Symposium on Applied Computing,
                    Pisa, Italy, April 4-8, 2016},
     pages = {406--411},
     publisher = {{ACM}},
     year = {2016},
     doi = {10.1145/2851613.2851623},
     timestamp = {Mon, 06 Jun 2016 18:51:39 +0200},
     biburl = {http://dblp.uni-trier.de/rec/bib/conf/sac/PolatoBHK16},
     bibsource = {dblp computer science bibliography, http://dblp.org},
     bibtex_show = true
   }

3. Accurate fact harvesting from natural language text in wikipedia with Lector

   Matteo Cannaviccio, Denilson Barbosa, and Paolo Merialdo

   In Proceedings of the 19th International Workshop on Web and Databases, San Francisco, CA, USA, June 26, 2016, Jun 2016

   DOI Bib

   @inproceedings{CannaviccioBM_WebDB2016,
     author = {Cannaviccio, Matteo and Barbosa, Denilson and Merialdo, Paolo},
     title = {Accurate fact harvesting from natural language text in wikipedia with
                    Lector},
     booktitle = {Proceedings of the 19th International Workshop on Web and Databases,
                    San Francisco, CA, USA, June 26, 2016},
     pages = {9},
     publisher = {{ACM}},
     year = {2016},
     doi = {10.1145/2932194.2932203},
     timestamp = {Mon, 20 Jun 2016 08:34:57 +0200},
     biburl = {http://dblp.uni-trier.de/rec/bib/conf/webdb/CannaviccioBM16},
     bibsource = {dblp computer science bibliography, http://dblp.org},
     bibtex_show = true
   }

2015

1. Hadoop branching: Architectural impacts on energy and performance

   Ivanilton Polato, Denilson Barbosa, Abram Hindle, and 1 more author

   In Sixth International Green and Sustainable Computing Conference, IGSC 2015, Las Vegas, NV, USA, December 14-16, 2015, Jun 2015

   DOI Bib

   @inproceedings{PolatoBHK_Green2015,
     author = {Polato, Ivanilton and Barbosa, Denilson and Hindle, Abram and Kon, Fabio},
     title = {Hadoop branching: Architectural impacts on energy and performance},
     booktitle = {Sixth International Green and Sustainable Computing Conference, {IGSC}
                    2015, Las Vegas, NV, USA, December 14-16, 2015},
     pages = {1--4},
     publisher = {{IEEE} Computer Society},
     year = {2015},
     doi = {10.1109/IGCC.2015.7393709},
     timestamp = {Fri, 29 Apr 2016 12:25:57 +0200},
     biburl = {http://dblp.uni-trier.de/rec/bib/conf/green/PolatoBHK15},
     bibsource = {dblp computer science bibliography, http://dblp.org},
     bibtex_show = true
   }

2. Identifying Controversial Wikipedia Articles Using Editor Collaboration Networks

   Hoda Sepehri-Rad, and Denilson Barbosa

   ACM TIST, Jun 2015

   DOI Bib

   @article{Rad_Barbosa_TIST2015,
     author = {Sepehri-Rad, Hoda and Barbosa, Denilson},
     doi = {10.1145/2630075},
     journal = {ACM TIST},
     number = {1},
     pages = {5},
     timestamp = {Wed, 15 Apr 2015 13:00:07 +0200},
     title = {Identifying Controversial Wikipedia Articles Using Editor Collaboration Networks},
     volume = {6},
     year = {2015},
     bibtex_show = true
   }

3. Inferencing in Information Extraction: Techniques and Applications

   Denilson Barbosa, Haixun Wang, and Cong Yu

   In IEEE 31st International Conference on Data Engineering, Jun 2015

   PDF
4. Advances in Artificial Intelligence - 28th Canadian Conference on Artificial Intelligence, Canadian AI 2015, Halifax, Nova Scotia, Canada, June 2-5, 2015, Proceedings

   Jun 2015

   DOI Bib

   @proceedings{Proc_Canadian_AI_2015,
     bibsource = {dblp computer science bibliography, http://dblp.org},
     doi = {10.1007/978-3-319-18356-5},
     editor = {Barbosa, Denilson and Milios, Evangelos E.},
     isbn = {978-3-319-18355-8},
     publisher = {Springer},
     series = {Lecture Notes in Computer Science},
     timestamp = {Wed, 29 Apr 2015 14:24:22 +0200},
     title = {Advances in Artificial Intelligence - 28th Canadian Conference on Artificial Intelligence, Canadian {AI} 2015, Halifax, Nova Scotia, Canada, June 2-5, 2015, Proceedings},
     volume = {9091},
     year = {2015},
     bibtex_show = true
   }

5. Entity Recognition and Linking on Tweets with Random Walks

   Zhaochen Guo, and Denilson Barbosa

   In Proceedings of the the 5th Workshop on Making Sense of Microposts co-located with the 24th International World Wide Web Conference, Florence, Italy, May 18th, 2015., Jun 2015

   Bib PDF

   @inproceedings{Guo_Barbosa_MSM2015,
     author = {Guo, Zhaochen and Barbosa, Denilson},
     booktitle = {Proceedings of the the 5th Workshop on Making Sense of Microposts co-located with the 24th International World Wide Web Conference, Florence, Italy, May 18th, 2015.},
     pages = {57--58},
     title = {Entity Recognition and Linking on Tweets with Random Walks},
     year = {2015},
     bibtex_show = true
   }

6. Hybrid HDFS: decreasing energy consumption and speeding up Hadoop using SSDs

   Ivanilton Polato, Denilson Barbosa, Abram Hindle, and 1 more author

   PeerJ PrePrints, Jun 2015

   DOI Bib

   @article{PolatoBHK_PeerJ2015,
     author = {Polato, Ivanilton and Barbosa, Denilson and Hindle, Abram and Kon, Fabio},
     title = {Hybrid {HDFS:} decreasing energy consumption and speeding up Hadoop
                    using SSDs},
     journal = {PeerJ PrePrints},
     volume = {3},
     pages = {e1320},
     year = {2015},
     doi = {10.7287/peerj.preprints.1320v1},
     timestamp = {Wed, 02 Sep 2015 19:49:32 +0200},
     biburl = {http://dblp.uni-trier.de/rec/bib/journals/peerjpre/PolatoBHK15},
     bibsource = {dblp computer science bibliography, http://dblp.org},
     bibtex_show = true
   }

2014

1. Robust Entity Linking via Random Walks

   Zhaochen Guo, and Denilson Barbosa

   In Proceedings of the 23rd ACM International Conference on Conference on Information and Knowledge Management, CIKM 2014, Shanghai, China, November 3-7, 2014, Jun 2014

   DOI
2. Entity linking with a unified semantic representation

   Zhaochen Guo, and Denilson Barbosa

   In 23rd International World Wide Web Conference, WWW ’14, Seoul, Republic of Korea, April 7-11, 2014, Companion Volume, Jun 2014

   Bib PDF

   @inproceedings{Guo_Barbosa_WWW2014,
     author = {Guo, Zhaochen and Barbosa, Denilson},
     booktitle = {23rd International World Wide Web Conference, WWW '14, Seoul, Republic of Korea, April 7-11, 2014, Companion Volume},
     pages = {1305-1310},
     publisher = {ACM},
     title = {Entity linking with a unified semantic representation},
     year = {2014},
     bibtex_show = true
   }

3. Knowledge Base Augmentation using Tabular Data

   Yoones A. Sekhavat, Francesco Paolo, Denilson Barbosa, and 1 more author

   In 7th Workshop on Linked Data on the Web, Jun 2014

   Bib PDF

   @inproceedings{Sekhavat_etal_LDOW2014,
     author = {Sekhavat, Yoones A. and di Paolo, Francesco and Barbosa, Denilson and Merialdo, Paolo},
     booktitle = {7th Workshop on Linked Data on the Web},
     publisher = {CEUR-WS.org},
     title = {Knowledge Base Augmentation using Tabular Data},
     year = {2014},
     bibtex_show = true
   }

4. Improving Open Relation Extraction via Sentence Re-Structuring

   Jordan Schmidek, and Denilson Barbosa

   In Proceedings of the Ninth International Conference on Language Resources and Evaluation (LREC’14), Jun 2014

   Bib PDF

   @inproceedings{Schmidek_Barbosa_LREC2014,
     address = {Reykjavik, Iceland},
     author = {Schmidek, Jordan and Barbosa, Denilson},
     booktitle = {Proceedings of the Ninth International Conference on Language Resources and Evaluation (LREC'14)},
     editor = {Chair), Nicoletta Calzolari (Conference and Choukri, Khalid and Declerck, Thierry and Loftsson, Hrafn and Maegaard, Bente and Mariani, Joseph and Moreno, Asuncion and Odijk, Jan and Piperidis, Stelios},
     isbn = {978-2-9517408-8-4},
     publisher = {European Language Resources Association (ELRA)},
     title = {Improving Open Relation Extraction via Sentence Re-Structuring},
     year = {2014},
     bibtex_show = true
   }

5. LDC2014T27 - Benchmarks for Open Relation Extraction

   Filipe Mesquita, Jordan Schmidek, and Denilson Barbosa

   Dec 2014

   Bib PDF

   @misc{Mesquita_et_al_LDC2014,
     author = {Mesquita, Filipe and Schmidek, Jordan and Barbosa, Denilson},
     date-modified = {2015-10-01 11:52:57 +0000},
     month = dec,
     published = {Linguistic Data Consortium},
     title = {LDC2014T27 - Benchmarks for Open Relation Extraction},
     year = {2014},
     bibtex_show = true
   }

6. Extracting Family Relationship Networks from Novels

   Aibek Makazhanov, Denilson Barbosa, and Grzegorz Kondrak

   CoRR, Dec 2014

   Bib PDF

   @article{Makazhanov_etal_CORR2014,
     author = {Makazhanov, Aibek and Barbosa, Denilson and Kondrak, Grzegorz},
     journal = {CoRR},
     title = {Extracting Family Relationship Networks from Novels},
     volume = {abs/1405.0603},
     year = {2014},
     bibtex_show = true
   }

7. Sentiment Analysis for Streams of Web Data: A Case Study of Brazilian Financial Markets

   Bruna Neuenschwander, Adriano César Machado Pereira, Wagner Meira Jr., and 1 more author

   In Proceedings of the 20th Brazilian Symposium on Multimedia and the Web, WebMedia 2014, João Pessoa, Brazil, November 18-21, 2014, Dec 2014

   DOI Bib

   @inproceedings{Neuenschwander_etal_WebMedia2014,
     author = {Neuenschwander, Bruna and Pereira, Adriano C{\'{e}}sar Machado and Jr., Wagner Meira and Barbosa, Denilson},
     title = {Sentiment Analysis for Streams of Web Data: {A} Case Study of Brazilian Financial Markets},
     booktitle = {Proceedings of the 20th Brazilian Symposium on Multimedia and the Web, WebMedia 2014, Jo{\~{a}}o Pessoa, Brazil, November 18-21, 2014},
     pages = {167--170},
     year = {2014},
     publisher = {ACM},
     doi = {10.1145/2664551.2664579},
     bibtex_show = true
   }

8. Using triads to identify local community structure in social networks

   Justin Fagnan, Osmar R. Zaiane, and Denilson Barbosa

   In 2014 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining, ASONAM 2014, Beijing, China, August 17-20, 2014, Dec 2014

   DOI Bib

   @inproceedings{Fagnan_et_al_ASONAM14,
     author = {Fagnan, Justin and Zaiane, Osmar R. and Barbosa, Denilson},
     booktitle = {2014 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining, ASONAM 2014, Beijing, China, August 17-20, 2014},
     doi = {10.1109/ASONAM.2014.6921568},
     pages = {108--112},
     title = {Using triads to identify local community structure in social networks},
     year = {2014},
     bibtex_show = true
   }

2013

1. Automatically Training Form Classifiers

   Mauricio C. Moraes, Carlos A. Heuser, Viviane Pereira Moreira, and 1 more author

   In Proceedings of the 14th International Web Information Systems Engineering Conference, Dec 2013

   Bib PDF

   @inproceedings{Moraes_etal_WISE2013,
     author = {Moraes, Mauricio C. and Heuser, Carlos A. and Moreira, Viviane Pereira and Barbosa, Denilson},
     booktitle = {Proceedings of the 14th International Web Information Systems Engineering Conference},
     pages = {441-453},
     title = {Automatically Training Form Classifiers},
     year = {2013},
     bibtex_show = true
   }

2. Effectiveness and Efficiency of Open Relation Extraction

   Filipe Mesquita, Jordan Schmidek, and Denilson Barbosa

   In Proceedings of the 2013 Conference on Empirical Methods in Natural Language Processing, Oct 2013

   PDF
3. Identification of Speakers in Novels

   Hua He, Denilson Barbosa, and Grzegorz Kondrak

   In Proceedings of the 51st Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers), Aug 2013

   PDF
4. Open Information Extraction with Tree Kernels

   Ying Xu, Mi-Young Kim, Kevin Quinn, and 2 more authors

   In Proceedings of the 2013 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies, Jun 2013

   PDF
5. Perspectives on Business Intelligence

   Raymond T. Ng, Patricia C. Arocena, Denilson Barbosa, and 10 more authors

   Jun 2013

   Bib PDF

   @book{BIN_book_2013,
     author = {Ng, Raymond T. and Arocena, Patricia C. and Barbosa, Denilson and Carenini, Giuseppe and Jr., Luiz Gomes and Jou, Stephan and Leung, Rock Anthony and Milios, Evangelos and Miller, Renee J. and Mylopoulos, John and Pottinger, Rachel A. and Tompa, Frank and Yu, Eric},
     publisher = {Morgan and Claypool Publishers},
     series = {Synthesis Lectures on Data Management},
     title = {Perspectives on Business Intelligence},
     year = {2013},
     bibtex_show = true
   }

6. Shallow Information Extraction for the Knowledge Web

   Denilson Barbosa, Haixun Wang, and Cong Yu

   In IEEE 29th International Conference on Data Engineering, Jun 2013

   Bib PDF

   @inproceedings{Barbosa_etal_ICDE2013,
     author = {Barbosa, Denilson and Wang, Haixun and Yu, Cong},
     booktitle = {IEEE 29th International Conference on Data Engineering},
     pages = {1264 - 1267},
     publisher = {IEEE},
     title = {Shallow Information Extraction for the Knowledge Web},
     year = {2013},
     bibtex_show = true
   }

7. SociQL: A Query Language for the SocialWeb

   Diego Serrano, Eleni Stroulia, Denilson Barbosa, and 1 more author

   In Advances in Network Analysis and its Applications, Jun 2013

   DOI Bib PDF

   @incollection{Serrano_etal_ANAA2013,
     author = {Serrano, Diego and Stroulia, Eleni and Barbosa, Denilson and Guana, Victor},
     booktitle = {Advances in Network Analysis and its Applications},
     doi = {10.1007/978-3-642-30904-5_17},
     editor = {Kranakis, Evangelos},
     pages = {381-406},
     publisher = {Springer Berlin Heidelberg},
     series = {Mathematics in Industry},
     title = {{SociQL: A Query Language for the SocialWeb}},
     volume = {18},
     year = {2013},
     bibtex_show = true
   }

8. Pre-Query Discovery of Domain-specific Query Forms: A Survey

   Mauricio Moraes, Carlos A. Heuser, Viviane Moreira, and 1 more author

   IEEE Transactions on Knowledge and Data Engineering, Jun 2013

   Bib PDF

   @article{Moraes_etal_TKDE2013,
     author = {Moraes, Mauricio and Heuser, Carlos A. and Moreira, Viviane and Barbosa, Denilson},
     journal = {IEEE Transactions on Knowledge and Data Engineering},
     number = {8},
     pages = {1830-1848},
     title = {{Pre-Query Discovery of Domain-specific Query Forms: A Survey}},
     volume = {25},
     year = {2013},
     bibtex_show = true
   }

2012

1. Identifying controversial articles in Wikipedia: A comparative study

   Hoda Sepehri-Rad, and Denilson Barbosa

   In 8th International Symposium on Wikis and Open Collaboration, Jun 2012

   Bib PDF

   @inproceedings{Rab_Barbosa_Wikisym2012,
     author = {Sepehri-Rad, Hoda and Barbosa, Denilson},
     booktitle = {8th International Symposium on Wikis and Open Collaboration},
     pages = {7:1--7:10},
     publisher = {ACM},
     title = {Identifying controversial articles in Wikipedia: A comparative study},
     year = {2012},
     bibtex_show = true
   }

2. Towards scalable summarization and visualization of large text corpora (abstract only)

   Tyler Sliwkanich, Douglas Schneider, Aaron Yong, and 2 more authors

   In Proceedings of the ACM SIGMOD International Conference on Management of Data, Jun 2012
3. Automatic Evaluation of Relation Extraction Systems on Large-scale

   Mirko Bronzi, Zhaochen Guo, Filipe Mesquita, and 2 more authors

   In Proceedings of the Joint Workshop on Automatic Knowledge Base Construction and Web-scale Knowledge Extraction (AKBC-WEKEX), Jun 2012

   Bib PDF

   @inproceedings{Bronzi_etal_AKBCWEKEX2012,
     address = {Montreal, Canada},
     author = {Bronzi, Mirko and Guo, Zhaochen and Mesquita, Filipe and Barbosa, Denilson and Merialdo, Paolo},
     booktitle = {Proceedings of the Joint Workshop on Automatic Knowledge Base Construction and Web-scale Knowledge Extraction (AKBC-WEKEX)},
     month = jun,
     pages = {19--24},
     publisher = {Association for Computational Linguistics},
     title = {Automatic Evaluation of Relation Extraction Systems on Large-scale},
     year = {2012},
     bibtex_show = true
   }

4. Extracting information networks from the blogosphere

   Yuval Merhav, Filipe Mesquita, Denilson Barbosa, and 2 more authors

   ACM Transactions on the Web, Jun 2012

   DOI Bib

   @article{Merhav_etal_TWEB2012,
     acmid = {2344418},
     address = {New York, NY, USA},
     articleno = {11},
     author = {Merhav, Yuval and Mesquita, Filipe and Barbosa, Denilson and Yee, Wai Gen and Frieder, Ophir},
     doi = {10.1145/2344416.2344418},
     issn = {1559-1131},
     issue_date = {September 2012},
     journal = {ACM Transactions on the Web},
     keywords = {clustering, domain frequency, named entities, open information extraction, relation extraction},
     number = {3},
     numpages = {33},
     pages = {11:1--11:33},
     publisher = {ACM},
     title = {Extracting information networks from the blogosphere},
     volume = {6},
     year = {2012},
     bibtex_show = true
   }

5. Leveraging editor collaboration patterns in wikipedia

   Hoda Sepehri-Rad, Aibek Makazhanov, Davood Rafiei, and 1 more author

   In Proceedings of the 23rd ACM conference on Hypertext and social media, Milwaukee, Wisconsin, USA, Jun 2012

   DOI Bib

   @inproceedings{Rad_etaal_HT2012,
     acmid = {2310001},
     author = {Sepehri-Rad, Hoda and Makazhanov, Aibek and Rafiei, Davood and Barbosa, Denilson},
     booktitle = {Proceedings of the 23rd ACM conference on Hypertext and social media},
     doi = {10.1145/2309996.2310001},
     isbn = {978-1-4503-1335-3},
     keywords = {admin election, controversial articles, social interactions, wikipedia},
     location = {Milwaukee, Wisconsin, USA},
     numpages = {10},
     pages = {13--22},
     publisher = {ACM},
     series = {HT '12},
     title = {Leveraging editor collaboration patterns in wikipedia},
     year = {2012},
     bibtex_show = true
   }

6. Topic Classification of Blog Posts Using Distant Supervision

   Stephanie Husby, and Denilson Barbosa

   In Proceedings of the Workshop on Semantic Analysis in Social Media, Apr 2012

   Bib PDF

   @inproceedings{Husby_Barbosa_EACLW2012,
     address = {Avignon, France},
     author = {Husby, Stephanie and Barbosa, Denilson},
     booktitle = {Proceedings of the Workshop on Semantic Analysis in Social Media},
     month = apr,
     pages = {28--36},
     publisher = {Association for Computational Linguistics},
     title = {Topic Classification of Blog Posts Using Distant Supervision},
     year = {2012},
     bibtex_show = true
   }

2011

1. Efficient Top-k Approximate Subtree Matching in Small Memory

   Nikolaus Augsten, Denilson Barbosa, Michael M. Bohlen, and 1 more author

   IEEE Transactions on Knowledge and Data Engineering, Apr 2011

   Bib PDF

   @article{Augsten_etal_TKDE2011,
     address = {Los Alamitos, CA, USA},
     author = {Augsten, Nikolaus and Barbosa, Denilson and Bohlen, Michael M. and Palpanas, Themis},
     issn = {1041-4347},
     journal = {IEEE Transactions on Knowledge and Data Engineering},
     pages = {1123-1137},
     publisher = {IEEE Computer Society},
     title = {Efficient Top-k Approximate Subtree Matching in Small Memory},
     volume = {23},
     year = {2011},
     bibtex_show = true
   }

2. Generating Synthetic Database Schemas for Simulation Purposes

   Carlos Eduardo Pires, Priscilla Vieira, Marcio Saraiva, and 1 more author

   In Proceedings of the 22nd International Conference on Database and Expert Systems Applications, Apr 2011

   Bib PDF

   @inproceedings{Pires_etal_DEXA2011,
     author = {Pires, Carlos Eduardo and Vieira, Priscilla and Saraiva, Marcio and Barbosa, Denilson},
     booktitle = {Proceedings of the 22nd International Conference on Database and Expert Systems Applications},
     pages = {502--510},
     publisher = {Springer},
     title = {Generating Synthetic Database Schemas for Simulation Purposes},
     year = {2011},
     bibtex_show = true
   }

3. Access Control Policy Translation, Verification, and Minimization within Heterogeneous Data Federations

   Gregory Leighton, and Denilson Barbosa

   ACM Transactions on Information and System Security, Apr 2011

   Bib PDF

   @article{Leighton_Barbosa_TISSEC2011,
     author = {Leighton, Gregory and Barbosa, Denilson},
     journal = {ACM Transactions on Information and System Security},
     number = {3},
     publisher = {ACM},
     title = {Access Control Policy Translation, Verification, and Minimization within Heterogeneous Data Federations},
     volume = {14},
     year = {2011},
     bibtex_show = true
   }

4. Extracting Meta Statements from the Blogosphere

   Filipe Mesquita, and Denilson Barbosa

   In Proceedings of the Fifth International AAAI Conference on Weblogs and Social Media, Apr 2011

   PDF
5. Towards identifying arguments in Wikipedia pages

   Hoda Sepehri-Rad, and Denilson Barbosa

   In Proceedings of the 20th International Conference on World Wide Web, Apr 2011

   Bib PDF

   @inproceedings{Rad_Barbosa_WWW2011,
     author = {Sepehri-Rad, Hoda and Barbosa, Denilson},
     booktitle = {Proceedings of the 20th International Conference on World Wide Web},
     pages = {117-118},
     publisher = {ACM},
     title = {Towards identifying arguments in Wikipedia pages},
     year = {2011},
     bibtex_show = true
   }

2010

1. The Actor-Topic Model for Extracting Social Networks in Literary Narrative

   Asli Celikyilmaz, Dilek Hakkani-Tur, Hua He, and 2 more authors

   In Proceedings of the NIPS 2010 Workshop – Machine Learning for Social Computing, Apr 2010

   Bib PDF

   @inproceedings{Celikyilmaz_etal_NIPS_MLSC2010,
     author = {Celikyilmaz, Asli and Hakkani-Tur, Dilek and He, Hua and Kondrak, Greg and Barbosa, Denilson},
     booktitle = {Proceedings of the NIPS 2010 Workshop -- Machine Learning for Social Computing},
     pages = {7 pp},
     title = {The Actor-Topic Model for Extracting Social Networks in Literary Narrative},
     year = {2010},
     bibtex_show = true
   }

2. Analyzing natural-language artifacts of the software process

   Maryam Hasan, Eleni Stroulia, Denilson Barbosa, and 1 more author

   In 26th IEEE International Conference on Software Maintenance, Apr 2010

   Bib PDF

   @inproceedings{Hasan_etal_ICSM2010,
     author = {Hasan, Maryam and Stroulia, Eleni and Barbosa, Denilson and Alalfi, Manar H.},
     booktitle = {26th IEEE International Conference on Software Maintenance},
     pages = {1-5},
     title = {Analyzing natural-language artifacts of the software process},
     year = {2010},
     bibtex_show = true
   }

3. Exploring and visualizing academic social networks

   Veselin Ganev, Zhaochen Guo, Diego Serrano, and 2 more authors

   In 19th ACM Conference on Information and Knowledge Management, Apr 2010

   Bib PDF

   @inproceedings{Ganev_etal_CIKM2010,
     author = {Ganev, Veselin and Guo, Zhaochen and Serrano, Diego and Barbosa, Denilson and Stroulia, Eleni},
     booktitle = {19th ACM Conference on Information and Knowledge Management},
     pages = {1963-1964},
     publisher = {ACM},
     title = {Exploring and visualizing academic social networks},
     year = {2010},
     bibtex_show = true
   }

4. Incorporating global information into named entity recognition systems using relational context

   Yuval Merhav, Filipe Mesquita, Denilson Barbosa, and 2 more authors

   In Proceeding of the 33rd International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR 2010, Apr 2010

   Bib PDF

   @inproceedings{Merhav_etal_SIGIR2010,
     author = {Merhav, Yuval and Mesquita, Filipe and Barbosa, Denilson and Yee, Wai Gen and Frieder, Ophir},
     booktitle = {Proceeding of the 33rd International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR 2010},
     pages = {883-884},
     publisher = {ACM},
     title = {Incorporating global information into named entity recognition systems using relational context},
     year = {2010},
     bibtex_show = true
   }

5. Access control policy translation and verification within heterogeneous data federations

   Gregory Leighton, and Denilson Barbosa

   In 15th ACM Symposium on Access Control Models and Technologies, Apr 2010

   Bib PDF

   @inproceedings{Leighton_Barbosa_SACMAT2010,
     author = {Leighton, Gregory and Barbosa, Denilson},
     booktitle = {15th ACM Symposium on Access Control Models and Technologies},
     pages = {173-182},
     publisher = {ACM},
     title = {Access control policy translation and verification within heterogeneous data federations},
     year = {2010},
     bibtex_show = true
   }

6. Extracting Information Networks from the Blogosphere: State-of-the-Art and Challenges

   Filipe Mesquita, Yuval Merhav, and Denilson Barbosa

   In 4th Int’l AAAI Conference on Weblogs and Social Media–Data Challenge, Apr 2010

   Bib PDF

   @inproceedings{Mesquita_Barbosa_ICWSM2010,
     author = {Mesquita, Filipe and Merhav, Yuval and Barbosa, Denilson},
     booktitle = {4th Int'l AAAI Conference on Weblogs and Social Media--Data Challenge},
     title = {Extracting Information Networks from the Blogosphere: State-of-the-Art and Challenges},
     year = {2010},
     bibtex_show = true
   }

7. A Framework for Automatic Schema Mapping Verification Through Reasoning

   Paolo Cappellari, Denilson Barbosa, and Paolo Atzeni

   In International Workshop on Data Engineering meets the Semantic Web-In conjunction with ICDE 2010, Apr 2010

   Bib PDF

   @inproceedings{Cappellari_etal_ICDEW2010,
     author = {Cappellari, Paolo and Barbosa, Denilson and Atzeni, Paolo},
     booktitle = {International Workshop on Data Engineering meets the Semantic Web-In conjunction with ICDE 2010},
     pages = {245-250},
     publisher = {IEEE},
     title = {A Framework for Automatic Schema Mapping Verification Through Reasoning},
     year = {2010},
     bibtex_show = true
   }

8. TASM: Top-k Approximate Subtree Matching

   Nikolaus Augsten, Denilson Barbosa, Michael Bohlen, and 1 more author

   In 26th IEEE International Conference on Data Engineering, Apr 2010

   Bib PDF

   @inproceedings{Augsten_etal_ICDE2010,
     author = {Augsten, Nikolaus and Barbosa, Denilson and Bohlen, Michael and Palpanas, Themis},
     booktitle = {26th IEEE International Conference on Data Engineering},
     pages = {353-364},
     publisher = {IEEE Computer Society},
     title = {TASM: Top-k Approximate Subtree Matching},
     year = {2010},
     bibtex_show = true
   }

2009

1. Optimizing XML Compression

   Gregory Leighton, and Denilson Barbosa

   In 6th International XML Database Symposium, Apr 2009

   Bib PDF

   @inproceedings{LeightonB_XSym2009,
     author = {Leighton, Gregory and Barbosa, Denilson},
     booktitle = {6th International XML Database Symposium},
     pages = {81-105},
     publisher = {Springer},
     title = {Optimizing XML Compression},
     year = {2009},
     bibtex_show = true
   }

2. Microbenchmark

   Denilson Barbosa, Ioana Manolescu, and Jeffrey Xu Yu

   In Encyclopedia of Database Systems, Apr 2009

   Bib PDF

   @incollection{BarbosaMY_DBEnc2009a,
     author = {Barbosa, Denilson and Manolescu, Ioana and Yu, Jeffrey Xu},
     booktitle = {Encyclopedia of Database Systems},
     pages = {1737},
     publisher = {Springer US},
     title = {Microbenchmark},
     year = {2009},
     bibtex_show = true
   }

3. XML Benchmarks

   Denilson Barbosa, Ioana Manolescu, and Jeffrey Xu Yu

   In Encyclopedia of Database Systems, Apr 2009

   Bib PDF

   @incollection{BarbosaMY_DBEnc2009b,
     author = {Barbosa, Denilson and Manolescu, Ioana and Yu, Jeffrey Xu},
     booktitle = {Encyclopedia of Database Systems},
     pages = {3576-3579},
     publisher = {Springer US},
     title = {XML Benchmarks},
     year = {2009},
     bibtex_show = true
   }

4. XML Storage

   Denilson Barbosa, Philip Bohannon, Juliana Freire, and 4 more authors

   In Encyclopedia of Database Systems, Apr 2009

   Bib PDF

   @incollection{BarbosaBFKMVY_DBEnc09,
     author = {Barbosa, Denilson and Bohannon, Philip and Freire, Juliana and Kanne, Carl-Christian and Manolescu, Ioana and Vassalos, Vasilis and Yoshikawa, Masatoshi},
     booktitle = {Encyclopedia of Database Systems},
     pages = {3627-3634},
     publisher = {Springer US},
     title = {XML Storage},
     year = {2009},
     bibtex_show = true
   }

5. Application Benchmark

   Denilson Barbosa, Ioana Manolescu, and Jeffrey Xu Yu

   In Encyclopedia of Database Systems, Apr 2009

   Bib PDF

   @incollection{BarbosaMY_DBEnc09,
     author = {Barbosa, Denilson and Manolescu, Ioana and Yu, Jeffrey Xu},
     booktitle = {Encyclopedia of Database Systems},
     crossref = {DBLP:reference/db/2009},
     pages = {99-100},
     publisher = {Springer US},
     title = {Application Benchmark},
     year = {2009},
     bibtex_show = true
   }

6. Optimizing XML Compression (Extended Abstract)

   Gregory Leighton, and Denilson Barbosa

   CoRR, Apr 2009

   Bib PDF

   @article{LeightonB_corr_abs_0905_4761,
     author = {Leighton, Gregory and Barbosa, Denilson},
     journal = {CoRR},
     title = {Optimizing XML Compression (Extended Abstract)},
     volume = {abs/0905.4761},
     year = {2009},
     bibtex_show = true
   }

7. An Environment for Building, Exploring and Querying Academic Social Networks

   Veselin Ganev, Zhaochen Guo, Diego Serrano, and 3 more authors

   In ACM Conference on Management of Emergent Digital Ecosystems, Apr 2009

   Bib PDF

   @inproceedings{GanevGSTBS_MEDES2009,
     author = {Ganev, Veselin and Guo, Zhaochen and Serrano, Diego and Tansey, Brendan and Barbosa, Denilson and Stroulia, Eleni},
     booktitle = {ACM Conference on Management of Emergent Digital Ecosystems},
     pages = {282--289},
     publisher = {ACM},
     title = {An Environment for Building, Exploring and Querying Academic Social Networks},
     year = {2009},
     bibtex_show = true
   }

8. Towards Automatic Schema Mapping Verification Through Reasoning

   Paolo Cappellari, and Denilson Barbosa

   In International Workshop on Logic in Databases, Apr 2009

   Bib PDF

   @inproceedings{CappellariB_LID2009,
     author = {Cappellari, Paolo and Barbosa, Denilson},
     booktitle = {International Workshop on Logic in Databases},
     date-modified = {2015-10-01 11:52:44 +0000},
     pages = {43-56},
     title = {Towards Automatic Schema Mapping Verification Through Reasoning},
     year = {2009},
     bibtex_show = true
   }

2007

1. Database and XMLTechnologies, 5th International XML Database Symposium, XSym 2007, Vienna, Austria, September 23-24, 2007, Proceedings

   Apr 2007

   DOI Bib PDF

   @proceedings{xsym2007,
     booktitle = {XSym},
     doi = {DOI: 10.1007/978-3-540-75288-2},
     editor = {Barbosa, Denilson and Bonifati, Angela and Bellahsene, Zohra and Hunt, Ela and Unland, Rainer},
     isbn = {978-3-540-75287-5},
     publisher = {Springer},
     series = {Lecture Notes in Computer Science},
     title = {Database and XMLTechnologies, 5th International XML Database Symposium, XSym 2007, Vienna, Austria, September 23-24, 2007, Proceedings},
     volume = {4704},
     year = {2007},
     bibtex_show = true
   }

2. Labeling Data Extracted from the Web

   Altigran Soares Silva, Denilson Barbosa, Joao M. B. Cavalcanti, and 1 more author

   In Proceedings of the 6th International Conference on Ontologies, DataBases, and Applications of Semantics, Apr 2007

   Bib PDF

   @inproceedings{SilvaBCS_ODBASE2007,
     author = {da Silva, Altigran Soares and Barbosa, Denilson and Cavalcanti, Joao M. B. and Sevalho, Marco A. S.},
     booktitle = {Proceedings of the 6th International Conference on Ontologies, DataBases, and Applications of Semantics},
     pages = {1099-1116},
     publisher = {Springer},
     title = {Labeling Data Extracted from the Web},
     year = {2007},
     bibtex_show = true
   }

3. FleDEx: Flexible Data Exchange

   Filipe Mesquita, Denilson Barbosa, Eli Cortez, and 1 more author

   In Proceedings of the 9th ACM International Workshop on Web Information and Data Management, Apr 2007

   Bib PDF

   @inproceedings{MesquitaBCS_WIDM2007,
     author = {Mesquita, Filipe and Barbosa, Denilson and Cortez, Eli and and Altigran S. da Silva},
     booktitle = {Proceedings of the 9th ACM International Workshop on Web Information and Data Management},
     pages = {25-32},
     title = {FleDEx: Flexible Data Exchange},
     year = {2007},
     bibtex_show = true
   }

4. Adaptive Record Extraction From Web Pages

   Justin Park, and Denilson Barbosa

   In 16th World Wide Web Conference, Apr 2007

   PDF
5. Generating Synthetic XML Documents by Example

   Denilson Barbosa, and Grant Elliott

   Apr 2007
6. A Lightweight Framework for Exchanging Web Data

   Filipe Mesquita, Denilson Barbosa, Eli Cortez, and 1 more author

   Apr 2007

   PDF

2006

1. Efficient Incremental Validation of XML Documents After Composite Updates

   Denilson Barbosa, Gregory Leighton, and Andrew Smith

   In Proceedings of the Fourth International XML Database Symposium (XSym 2006), Apr 2006

   Bib PDF

   @inproceedings{BarbosaLS_XSym2006,
     address = {Seoul, Korea},
     author = {Barbosa, Denilson and Leighton, Gregory and Smith, Andrew},
     booktitle = {Proceedings of the Fourth International XML Database Symposium (XSym 2006)},
     date = {September 10-11},
     pages = {107-121},
     publisher = {Springer},
     title = {Efficient Incremental Validation of XML Documents After Composite Updates},
     year = {2006},
     bibtex_show = true
   }

2. Declarative generation of synthetic XML data

   Denilson Barbosa, and Alberto O. Mendelzon

   Softw., Pract. Exper., Apr 2006

   Bib PDF

   @article{BarbosaM_SPE2006,
     author = {Barbosa, Denilson and Mendelzon, Alberto O.},
     bibsource = {DBLP, http://dblp.uni-trier.de},
     journal = {Softw., Pract. Exper.},
     number = {10},
     pages = {1051-1079},
     title = {Declarative generation of synthetic XML data},
     volume = {36},
     year = {2006},
     bibtex_show = true
   }

2005

1. Goals and Benchmarks for Autonomic Configuration Recommenders

   Mariano P. Consens, Denilson Barbosa, Adrian M. Teisanu, and 1 more author

   In Proceedings of the ACM SIGMOD International Conference on Management of Data, Apr 2005

   Bib PDF

   @inproceedings{ConsensBTM_SIGMOD2005,
     author = {Consens, Mariano P. and Barbosa, Denilson and Teisanu, Adrian M. and Mignet, Laurent},
     bibsource = {DBLP, http://dblp.uni-trier.de},
     booktitle = {Proceedings of the ACM SIGMOD International Conference on Management of Data},
     pages = {239-250},
     publisher = {ACM},
     title = {Goals and Benchmarks for Autonomic Configuration Recommenders},
     year = {2005},
     bibtex_show = true
   }

2. Designing Information-Preserving Mapping Schemes for XML

   Denilson Barbosa, Juliana Freire, and Alberto O. Mendelzon

   In Proceedings of the 31st International Conference on Very Large Data Bases, Apr 2005

   PDF
3. Studying the XML Web: Gathering Statistics from an XML Sample

   Denilson Barbosa, Laurent Mignet, and Pierangelo Veltri

   World Wide Web, Apr 2005

   Bib PDF

   @article{BarbosaMV_WWWJ2005,
     author = {Barbosa, Denilson and Mignet, Laurent and Veltri, Pierangelo},
     bibsource = {DBLP, http://dblp.uni-trier.de},
     journal = {World Wide Web},
     number = {4},
     pages = {413-438},
     title = {Studying the XML Web: Gathering Statistics from an XML Sample},
     volume = {8},
     year = {2005},
     bibtex_show = true
   }

4. Incremental Validation of XML Documents and Mappings

   Denilson Barbosa

   Department of Computer Science, University of Toronto, Apr 2005

2004

1. Information Preservation in XML-to-Relational Mappings

   Denilson Barbosa, Juliana Freire, and Alberto O. Mendelzon

   In Proceedings of the Second International XML Database Symposium (XSym 2004), Apr 2004

   Bib PDF

   @inproceedings{BarbosaFM_XSym2004,
     author = {Barbosa, Denilson and Freire, Juliana and Mendelzon, Alberto O.},
     booktitle = {Proceedings of the Second International XML Database Symposium (XSym 2004)},
     pages = {66-81},
     title = {Information Preservation in XML-to-Relational Mappings},
     year = {2004},
     bibtex_show = true
   }

2. Efficient Incremental Validation of XML Documents

   Denilson Barbosa, Alberto O. Mendelzon, Leonid Libkin, and 2 more authors

   In Proceedings of the 20th International Conference on Data Engineering (ICDE 2004), Apr 2004

   Bib PDF

   @inproceedings{BarbosaMLMA_ICDE2004,
     author = {Barbosa, Denilson and Mendelzon, Alberto O. and Libkin, Leonid and Mignet, Laurent and Arenas, Marcelo},
     bibsource = {DBLP, http://dblp.uni-trier.de},
     booktitle = {Proceedings of the 20th International Conference on Data Engineering (ICDE 2004)},
     pages = {671-682},
     title = {Efficient Incremental Validation of XML Documents},
     year = {2004},
     bibtex_show = true
   }

3. Information Preservation in XML-to-Relational Mappings

   Denilson Barbosa, Juliana Freire, and Alberto O. Mendelzon

   Apr 2004

   PDF
4. Experimental Evaluation of Autonomic Indexing

   Denilson Barbosa, Mariano P. Consens, and Laurent Mignet

   Apr 2004
5. CASCON 2003 Workshop Report - XML Query Processing

   Denilson Barbosa, and Alberto O. Mendelzon

   Apr 2004

   PDF

2003

1. The XML web: a first study

   Laurent Mignet, Denilson Barbosa, and Pierangelo Veltri

   In Proceedings of the Twelfth International World Wide Web Conference, Apr 2003

   Bib PDF

   @inproceedings{MignetBV_WWW2003,
     author = {Mignet, Laurent and Barbosa, Denilson and Veltri, Pierangelo},
     bibsource = {DBLP, http://dblp.uni-trier.de},
     booktitle = {Proceedings of the Twelfth International World Wide Web Conference},
     pages = {500-510},
     publisher = {ACM},
     title = {The XML web: a first study},
     year = {2003},
     bibtex_show = true
   }

2. On the Characterization of the XML Web

   Laurent Mignet, Denilson Barbosa, and Pierangelo Veltri

   In Proceedings of the Eleventh Italian Symposium on Advanced Database Systems (SEBD 2003), Apr 2003
3. Finding ID Attributes in XML Documents

   Denilson Barbosa, and Alberto O. Mendelzon

   In Proceedings of the International XML Database Symposium, Apr 2003

   Bib PDF

   @inproceedings{BarbosaM_XSym2003,
     author = {Barbosa, Denilson and Mendelzon, Alberto O.},
     bibsource = {DBLP, http://dblp.uni-trier.de},
     booktitle = {Proceedings of the International XML Database Symposium},
     crossref = {DBLP:conf/xsym/2003},
     pages = {180-194},
     title = {Finding ID Attributes in XML Documents},
     year = {2003},
     bibtex_show = true
   }

4. ToXgene Template Specification Language

   Denilson Barbosa

   Apr 2003

   PDF
5. CASCON 2002 Workshop Report - XML Data Management

   Denilson Barbosa, and Alberto O. Mendelzon

   Apr 2003

   Bib PDF

   @techreport{IBM/BarbosaMendelzon03,
     author = {Barbosa, Denilson and Mendelzon, Alberto O.},
     date = {January},
     institution = {IBM},
     number = {TR-74.188-14},
     title = {CASCON 2002 Workshop Report - XML Data Management},
     year = {2003},
     bibtex_show = true
   }

2002

1. ToXgene: An extensible template-based data generator for XML

   Denilson Barbosa, Alberto O. Mendelzon, John Keenleyside, and 1 more author

   In Proceedings of the Fifth International Workshop on the Web and Databases (WebDB 2002), Apr 2002

   Bib PDF

   @inproceedings{BarbosaMKL_WebDB2002,
     author = {Barbosa, Denilson and Mendelzon, Alberto O. and Keenleyside, John and Lyons, Kelly A.},
     bibsource = {DBLP, http://dblp.uni-trier.de},
     booktitle = {Proceedings of the Fifth International Workshop on the Web and Databases (WebDB 2002)},
     pages = {49-54},
     title = {ToXgene: An extensible template-based data generator for XML},
     year = {2002},
     bibtex_show = true
   }

2. ToXgene: a template-based data generator for XML

   Denilson Barbosa, Alberto O. Mendelzon, John Keenleyside, and 1 more author

   In Proceedings of the 2002 ACM SIGMOD International Conference on Management of Data, Apr 2002

   Bib PDF

   @inproceedings{BarbosaMKL_SIGMOD2002,
     author = {Barbosa, Denilson and Mendelzon, Alberto O. and Keenleyside, John and Lyons, Kelly A.},
     bibsource = {DBLP, http://dblp.uni-trier.de},
     booktitle = {Proceedings of the 2002 ACM SIGMOD International Conference on Management of Data},
     pages = {616},
     title = {ToXgene: a template-based data generator for XML},
     year = {2002},
     bibtex_show = true
   }

3. The XML Web: a First Study

   Laurent Mignet, Denilson Barbosa, and Pierangelo Veltri

   Apr 2002

2001

1. ToX - the Toronto XML Engine

   Denilson Barbosa, Attila Barta, Alberto O. Mendelzon, and 3 more authors

   In Workshop on Information Integration on the Web, Apr 2001

   PDF

2000

1. On the World Wide Web, XML and Open Hypermedia Systems (Extended Abstract)

   Denilson Barbosa

   Apr 2000

   Bib PDF

   @misc{CITO/Barbosa2000,
     address = {Ottawa, Ontario, Canada},
     author = {Barbosa, Denilson},
     date = {October 2-3},
     howpublished = {Poster at CITO Knowledge Network Conference},
     title = {On the World Wide Web, XML and Open Hypermedia Systems (Extended Abstract)},
     year = {2000},
     bibtex_show = true
   }

2. On Storage Methods for Semistructured Data

   Denilson Barbosa

   Apr 2000

   PDF
3. XML and Hypermedia Applications

   Denilson Barbosa

   Apr 2000

   PDF

1999

1. Parallelizing MPEG Video Encoding using Multiprocessors

   Denilson Barbosa, Joao Paulo Kitajima, and Wagner Meira Jr.

   In Proceedings of the XII Brazilian Symposium on Computer Graphics and Image Processing, Apr 1999

   Bib PDF

   @inproceedings{BarbosaKMjr_SIBGRAPI1999,
     address = {Campinas, SP, Brazil},
     author = {Barbosa, Denilson and Kitajima, Joao Paulo and Jr., Wagner Meira},
     booktitle = {Proceedings of the XII Brazilian Symposium on Computer Graphics and Image Processing},
     date = {October},
     pages = {215-222},
     publisher = {IEEE Computer Society},
     title = {Parallelizing MPEG Video Encoding using Multiprocessors},
     year = {1999},
     bibtex_show = true
   }

2. Real-time MPEG Encoding in Shared-Memory Multiprocessors

   Denilson Barbosa, João Paulo Kitajima, and Wagner Meira Jr

   In Proceedings of the 2nd International Conference - Parallel Computing Systems 1999, Apr 1999

   PDF
3. Compressao de Video Digital MPEG em Paralelo

   Denilson Barbosa

   Departamento de Ciência da Computação, Universidade Federal de Minas Gerais, Apr 1999

1998

1. Experimental Analysis of a Parallel Quicksort-based Algorithm for Suffix Array Generation

   Autran Macedo, Elaine S. Silva, Denilson M. Barbosa, and 5 more authors

   In Proceedings of the 3rd International Meeting on Vector and Parallel Processing, Apr 1998

   PDF