IRSTEA PUB00045753International audienceThis paper introduces TEWS —Twitter Events on the Semantic Web, pronounced like " news " —a semantic web tool for detection and representation of events taking as an input the social stream Twitter. The tool assists the user throughout a complete processing chain, starting from the detection of events on Twitter, their modeling and representation following the semantic web principles, to their storing in an RDF knowledge base that can be further published on the Web of Data

Bellahsene, Zohra

Ienco, Dino

Todorov, Konstantin

Vigo, Mykael

[Departement_IRSTEA]Territoires [TR1_IRSTEA]SYNERGIE [Axe_IRSTEA]TETIS-SISOIRSTEA PUB00045753International audienceThis paper introduces TEWS —Twitter Events on the Semantic Web, pronounced like " news " —a semantic web tool for detection and representation of events taking as an input the social stream Twitter. The tool assists the user throughout a complete processing chain, starting from the detection of events on Twitter, their modeling and representation following the semantic web principles, to their storing in an RDF knowledge base that can be further published on the Web of Data

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Twitter Event Detection and Modeling with TEWSMykael Vigo, Zohra Bellahsene, Dino Ienco, Konstantin TodorovTo cite this version:Mykael Vigo, Zohra Bellahsene, Dino Ienco, Konstantin Todorov. Twitter Event Detection andModeling with TEWS. ISWC: International Semantic Web Conference, Oct 2015, Bethlehem,PA, United States. 14th International Semantic Web Conference, 2015, Posters & Demonstra-tions Track. <http://ceur-ws.org/Vol-1486/>. <lirmm-01239194>HAL Id: lirmm-01239194https://hal-lirmm.ccsd.cnrs.fr/lirmm-01239194Submitted on 7 Dec 2015HAL is a multi-disciplinary open accessarchive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come fromteaching and research institutions in France orabroad, or from public or private research centers.L’archive ouverte pluridisciplinaire HAL, estdestine´e au de´poˆt et a` la diffusion de documentsscientifiques de niveau recherche, publie´s ou non,e´manant des e´tablissements d’enseignement et derecherche franc¸ais ou e´trangers, des laboratoirespublics ou prive´s.Twitter Event Detection and Modelingwith TEWSMykael Vigo1, Zohra Bellahsene1, Dino Ienco2, Konstantin Todorov11 LIRMM / University of Montpellier, France{firstname.lastname@lirmm.fr}2 Irstea, UMR TETIS, Montpellier, Francedino.ienco@irstea.frAbstract. This paper introduces TEWS—TwitterEvents on the SemanticWeb, pronounced like “news”—a semantic web tool for detection andrepresentation of events taking as an input the social stream Twitter.The tool assists the user throughout a complete processing chain, start-ing from the detection of events on Twitter, their modeling and repre-sentation following the semantic web principles, to their storing in anRDF knowledge base that can be further published on the Web of Data.Keywords: Linked Data, Event Extraction, Twitter, RDF Modeling1 Introduction and MotivationOne of the goals of the Linked Open Data (LOD) initiative is to structure andinterconnect data on the web by using semantic web technologies, such as theResource Description Framework (RDF), thus taking the web of today up tothe level of a veritable information network [1]. Although a considerable efforthas been made in that direction throughout the last years, many sources ofinformation on the web still remain unexplored, although they contain usefuldata beneficial for the LOD project. In this paper, we focus on the social mediumTwitter—a platform for the publication of short messages (tweets) of maximallength of 140 characters. Twitter has became a major source of information aboutimportant events, made available in real time by media and ordinary users. Thecurrent paper describes TEWS, a tool that assists the user in the detection ofevents discussed on Twitter and their representation conforming to the semanticweb principles in view of their publication on the web as RDF triples.The originality of the approach lies in the use of tweets produced by conven-tional media (news agencies) in order to guide the event detection process onthe tweets produced by ordinary users (the crowd). Contrary to previous works,in which the focus falls on event detection on Twitter [2] or the production ofRDF data from text [3], our proposal covers both tasks.TEWS 12 Overview of TEWSTEWS takes as an input a corpus of tweets. We have developed a protocol forthe continuous constitution of a corpus by the help of the Twitter4J3 API, whichis designed to collect tweets from the social stream. As shown on the left handside of Fig. 1 (steps 1–3), we are interested in two sources of information: (1) theconventional media, seen as a reliable and uninterrupted source of informationabout events (such as ABC News, Al Jazeera, CNN, BBC, etc.), and (2) thecrowd (ordinary users). The latter is filtered by considering only tweets thatcontain a hashtag or a keyword (a location) from the media tweets corpus. Theresulting set of tweets is continuously fed to TEWS in real time.The overall events detection workflow and their RDF representation is givenin Fig. 1. Steps 1–3 represent the corpus extraction procedure discussed above.TEWS is responsible for the actual extraction of events and their modeling andstoring as RDF triples, given in steps 4–6. Step 7 illustrates the option that thesedata are further included to the web of data following the well-established pub-lication protocol. As a design choice, the tool makes use of the MABED system[2] for detecting events and the WikiTimes [4] vocabulary for event modeling.Fig. 1. The workflow of TEWS preceeded by the process of corpus constitution andsucceeded by the data publishing step.Event Detection. MABED is based on statistical methods for the identifica-tion of important events discussed by the users in a tweets corpus. In the firstplace, an event is defined by a salient topic identified by a sudden increase of theoccurrence of certain key-words. An event is defined by a main key-word and aset of related terms. The efficiency of the approach is demonstrated in [2]. Notethat the system is user-parametrizable with respect to time slices length andconsideration of mentions (preceeded by the @ symbol). The length of the timeslices has to be proportional to the length of the corpus constitution period.Event Modeling. After comparing various existing ontologies, we have chosenthe WikiTimes model for representing events, for it appeared to be the closest toour vision of an event. WikiTimes allows for the creation of two types of resources– an event and a story (a sequence of events). We focus on simple events only.3 http://twitter4j.org/en/index.html2 M. Vigo, Z. Bellahsene, D. Ienco, K. TodorovEach event is anchored in the time and is characterized by several properties,described in a specific vocabulary, such as place and date of occurrence andinvolved entities, as well as additional information (Fig. 2).Fig. 2. The WikiTimes event resource model (taken from [4]).3 TEWS in Use: an ExampleWe explain how TEWS works through a case study. A video illustrating thisscenario is made available online4. The initial page of TEWS (Fig. 3(a)) allowsto define all the parameters our tool needs. It has three main areas: i) Corpusselection: in this box we can specify the date (year, month, day) related to thetweets collection. The tool will retrieve only tweets published in the specifiedperiod. ii) Detection Parameters: this area allows to introduce the parametersrelated to the MABED system [2]. We can specify parameters like “maximumnumber of events”, “maximum number of related words”, etc. iii) Corpus Pa-rameters: through this box we can specify the list of conventional media (newsagencies), from which TEWS extracts hashtags or keywords to filter events fromthe general (crowd) stream of Twitter. In this case study, we choose to select allthe conventional media sources. The interface allows to select a portion of them.Once parameters are chosen, the user can click on the Run detection button andTEWS will collect tweets and the events will be extracted.Fig. 3(b) shows the results related to the specified period and the param-eters introduced in the previous step. We can observe that TEWS detects tenevents. Each event is described by the date, the location, the involved entities,the sources and the textual description. From the result list we can select one(or more) lines and visualize the corresponding RDF triples automatically gen-erated by TEWS. In the example, we select the first event related to the Yemenearthquake and the tool produces the corresponding RDF knowledge. The RDFtriples are visualized at the bottom of the page. The WikiTimes [4] vocabulary4 https://www.dropbox.com/s/owc43372u47oe6k/tews_demo.mp4?dl=0TEWS 3(a) (b)Fig. 3.is employed to name the events properties. A standard procedure, based on thesemantic web best practices, is deployed for creating resource URI’s. At this stepthe user can serialize the produced knowledge in different formats (RDF/XML,N-Triplets, etc.) and the new set of RDF triplets can be successively publishedon the web of data or managed by standard triplestore engine.4 Conclusion and Future WorkWe introduced TEWS—a new Twitter event detection tool that produces RDFtriples. The tool exploits conventional media sources to extract important key-words to trace phenomena on the stream of tweets. TEWS supplies a completeprocessing chain that combines state-of-the-art Twitter event detection with se-mantic web technologies to produce new knowledge to share on the web of data.As future work, we plan to improve the natural language processing aspects ofthe tool (such as named entity recognition and word sens disambiguation in or-der to filter out false entities, (i.e., exploit DBPedia). We also plan to integrateother sources of information to enrich the knowledge extraction from Twittersupplying a more complete description of the detected events.References1. C. Bizer, T. Heath, and T. Berners-Lee, “Linked data - the story so far,” IJSWIS,vol. 5, no. 3, pp. 1–22, 2009.2. A. Guille and C. Favre, “Mention-anomaly-based event detection and tracking intwitter,” in Advances in Social Networks Analysis and Mining (ASONAM), 2014IEEE/ACM International Conference on, pp. 375–382, IEEE, 2014.3. R. Anantharangachar, S. Ramani, and S. Rajagopalan, “Ontology guided informa-tion extraction from unstructured text.,” IJVeST, vol. 4, no. 1, p. 19, 2013.4. G. Tran, M. Alrifai, T. N. Nguyen, and W. Nejdl, “Wikitimess knowledge extractionand enrichment process,” 2014.

Une méthode de detection et modélisation d'événements des messages sur Twitter

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