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2021
Rodosthenous, Christos; Michael, Loizos
A Crowdsourcing Methodology for Improved Geographic Focus Identification of News-Stories Proceedings Article
In: Proceedings of the 13th International Conference on Agents and Artificial Intelligence, 2021.
Abstract | BibTeX | Tags: crowdsourcing, Geographic Focus Identification, Information Retrieval, Natural Language Processing | Links:
@inproceedings{rodosthenous2021,
title = {A Crowdsourcing Methodology for Improved Geographic Focus Identification of News-Stories},
author = {Christos Rodosthenous and Loizos Michael},
url = {https://www.christosrodosthenous.info/wp-content/uploads/2020/12/ICAART_2021_80_CR.pdf
https://www.scitepress.org/Papers/2021/102284/102284.pdf},
year = {2021},
date = {2021-02-04},
booktitle = {Proceedings of the 13th International Conference on Agents and Artificial Intelligence},
abstract = {Past work on the task of identifying the geographic focus of news-stories has established that state-of-the-art performance can be achieved by using existing crowdsourced knowledge-bases. In this work we demonstrate that a further refinement of those knowledge-bases through an additional round of crowdsourcing can lead to improved performance on the aforementioned task. Our proposed methodology views existing knowledge-bases as collections of arguments in support of particular inferences in terms of the geographic focus of a given news-story. The refinement that we propose is to associate these arguments with weights --- computed through crowdsourcing --- in terms of how strongly they support their inference. The empirical results that we present establish the superior performance of this approach compared to the one using the original knowledge-base.},
keywords = {crowdsourcing, Geographic Focus Identification, Information Retrieval, Natural Language Processing},
pubstate = {published},
tppubtype = {inproceedings}
}
Past work on the task of identifying the geographic focus of news-stories has established that state-of-the-art performance can be achieved by using existing crowdsourced knowledge-bases. In this work we demonstrate that a further refinement of those knowledge-bases through an additional round of crowdsourcing can lead to improved performance on the aforementioned task. Our proposed methodology views existing knowledge-bases as collections of arguments in support of particular inferences in terms of the geographic focus of a given news-story. The refinement that we propose is to associate these arguments with weights --- computed through crowdsourcing --- in terms of how strongly they support their inference. The empirical results that we present establish the superior performance of this approach compared to the one using the original knowledge-base.
2018
Rodosthenous, Christos; Michael, Loizos
GeoMantis: Inferring the Geographic Focus of Text using Knowledge Bases Proceedings Article
In: Rocha, Ana Paula; van den Herik, Jaap (Ed.): Proceedings of the 10th International Conference on Agents and Artificial Intelligence (ICAART2018), 2018.
Abstract | BibTeX | Tags: Geographic Focus Identification, Geographic Information Systems, Information Retrieval, Knowledge Bases, Natural Language Processing | Links:
@inproceedings{Rodosthenous2018,
title = {GeoMantis: Inferring the Geographic Focus of Text using Knowledge Bases},
author = {Christos Rodosthenous and Loizos Michael},
editor = {Ana Paula Rocha and Jaap van den Herik},
url = {https://www.christosrodosthenous.info/wp-content/uploads/2018/02/ICAART_2018_50_CR.pdf
http://www.scitepress.org/DigitalLibrary/PublicationsDetail.aspx?ID=hDHdIxIPFBU=&t=1},
year = {2018},
date = {2018-01-17},
booktitle = {Proceedings of the 10th International Conference on Agents and Artificial Intelligence (ICAART2018)},
series = {10th International Conference on Agents and Artificial Intelligence (ICAART18)},
abstract = {We consider the problem of identifying the geographic focus of a document. Unlike some previous work on this problem, we do not expect the document to explicitly mention the target region, making our problem one of inference or prediction, rather than one of identification. Further, we seek to tackle the problem without appealing to specialized geographic information resources like gazetteers or atlases, but employ general-purpose knowledge bases and ontologies like ConceptNet and YAGO. We propose certain natural strategies towards addressing the problem, and show that the GeoMantis system that implements these strategies outperforms an existing state-of-the-art system, when compared on documents whose target region (country, in particular) is not explicitly mentioned or is obscured. Our results give evidence that using general-purpose knowledge bases and ontologies can, in certain cases, outperform even specialized tools.},
keywords = {Geographic Focus Identification, Geographic Information Systems, Information Retrieval, Knowledge Bases, Natural Language Processing},
pubstate = {published},
tppubtype = {inproceedings}
}
We consider the problem of identifying the geographic focus of a document. Unlike some previous work on this problem, we do not expect the document to explicitly mention the target region, making our problem one of inference or prediction, rather than one of identification. Further, we seek to tackle the problem without appealing to specialized geographic information resources like gazetteers or atlases, but employ general-purpose knowledge bases and ontologies like ConceptNet and YAGO. We propose certain natural strategies towards addressing the problem, and show that the GeoMantis system that implements these strategies outperforms an existing state-of-the-art system, when compared on documents whose target region (country, in particular) is not explicitly mentioned or is obscured. Our results give evidence that using general-purpose knowledge bases and ontologies can, in certain cases, outperform even specialized tools.
2017
Rodosthenous, Christos; Michael, Loizos
Inferring the Geographic Focus of Stories Using Crowdsourced Knowledge Bases Workshop
Cognition and Artificial Intelligence for Human-Centred Design (CAID2017), 2017.
Abstract | BibTeX | Tags: Geographic Focus Identification, Geographic Information Systems, Information Retrieval, Knowledge Bases, Natural Language Processing
@workshop{Rodosthenous2018b,
title = {Inferring the Geographic Focus of Stories Using Crowdsourced Knowledge Bases},
author = {Christos Rodosthenous and Loizos Michael},
year = {2017},
date = {2017-08-19},
booktitle = {Cognition and Artificial Intelligence for Human-Centred Design (CAID2017)},
abstract = {We consider the problem of identifying the geographic focus of a story and more specifically a news story. Most of the times, we do not expect the story to explicitly mention the target region, making our problem one of inference or prediction, rather than one of identification. Further, we seek to tackle the problem without appealing to specialized geographic information resources like gazetteers or atlases, but employ only general-purpose crowdsourced knowledge bases and ontologies like ConceptNet and YAGO and techniques that are cognitively compatible with human reasoning. In particular, we propose certain natural strategies towards addressing the problem, and show that the GeoMantis system that implements these strategies outperforms an existing state-of-the-art system, when compared on stories whose target region (country, in particular) is not explicitly mentioned or is obscured. Our results give evidence that using general-purpose crowdsourced knowledge bases and ontologies can, in certain cases, outperform even specialized tools.},
keywords = {Geographic Focus Identification, Geographic Information Systems, Information Retrieval, Knowledge Bases, Natural Language Processing},
pubstate = {published},
tppubtype = {workshop}
}
We consider the problem of identifying the geographic focus of a story and more specifically a news story. Most of the times, we do not expect the story to explicitly mention the target region, making our problem one of inference or prediction, rather than one of identification. Further, we seek to tackle the problem without appealing to specialized geographic information resources like gazetteers or atlases, but employ only general-purpose crowdsourced knowledge bases and ontologies like ConceptNet and YAGO and techniques that are cognitively compatible with human reasoning. In particular, we propose certain natural strategies towards addressing the problem, and show that the GeoMantis system that implements these strategies outperforms an existing state-of-the-art system, when compared on stories whose target region (country, in particular) is not explicitly mentioned or is obscured. Our results give evidence that using general-purpose crowdsourced knowledge bases and ontologies can, in certain cases, outperform even specialized tools.