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Top1. Introduction
Entity extraction is a key process for ontology engineering. In most cases, the information of a specific emergent event involves several interdisciplinary domain ontologies. The corpus of the event related social-messages (e.g. tweets) contains fruitful information, which is valuable for establishing operational procedures that can contribute to solutions for disaster prevention. Integrating such diverse kinds of information presents a challenge to anyone seeking to establish a coherent picture of the developing situation and to enable sensible decision-making operations. For emergency management, one of the key challenges encountered in social data mining is event validation by consecutive social streams based on their temporal and spatial factors. The decision making process requires real-time processing of information need for situational awareness, and standardized operating procedure that people can follow for quick response to critical events. One valuable application might be an ontology entities extractor that discovers entities from the online social messages regarding specific events. Such extensible event ontology has a significant role to play in the task of improving the ability to process information. Motivated by this need, in this work we utilize social messages collected from Twitter for building an ontology model to cope with emerging disasters events. It is expected that the extended ontology and knowledge can be used to locate essential information to cope with novel disasters.
This study was developed using a novel event modelling method based on the data-cluster slicing method. By analysing the publicly available social streams, many large accidents or disasters could be immediately detected for investigation (Gong, Zeng, & Zhang, 2011; Lee et al., 2012). Although the applications related to event detection by using social datasets (e.g. tweets) have been largely developed in recent years (Aggarwal, Han, Wang, & Yu, 2003; Chi, Song, Zhou, Hino, & Tseng, 2007; Feng, Martin, Weining, & Aoying, 2006; Hung-Leng, 2009; Zhu & Shasha, 2002), little work has been done to produce a consistent information source related to ontology engineering using real-time social data, with which an online extensible ontology can be learned and updated for emergency response. We first implement an early warning system that provides a faster way to detect events in their early stage with a new term weighting technique to deal with huge data of social media streams. Then, the detected-event datasets can be used to build an online event-ontology learning model that can directly identify and extract candidate terms for updating the event ontologies.
The goal of this work is to design a way to extract the key entities for updating extended event-ontologies, rather than starting to construct ontologies from scratch. We focus on the online community in Twitter and attributing the content associated with specific events for investigation, allowing for developing relevant applications for prediction of possible evolution and early warning of disasters.