Abstract
Users of the internet often wish to follow certain news events, and the interests of these users often overlap. General search engines (GSEs) cannot be used to achieve this task due to incomplete coverage and lack of freshness. Instead, a broker is used to regularly query the built-in search engines (BSEs) of news and social media sites. Each user defines an event profile consisting of a set of query rules called event rules (ERs). To ensure that queries match the semantics of BSEs, ERs are transformed into a disjunctive normal form, and separated into conjunctive clauses (atomic event rules, AERs). It is slow to process all AERs on BSEs, and can violate query submission rate limits. Accordingly, the set of AERs is reduced to eliminate AERs that are duplicates, or logically contained by other AERs. Five types of event are selected for experimental comparison and analysis, including natural disasters, accident disasters, public health events, social security events, and negative events of public servants. Using 12 BSEs, 85 ERs for five types of events are defined by five users. Experimental comparison is conducted on three aspects: event rule reduction ratio, number of collected events, and that of related events. Experimental results in this paper show that event rule reduction effectively enhances the efficiency of crawling.
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Zhaoman Zhong received his PhD in Computer Science from Shanghai University, China in 2011. His research interests are information retrieval and artificial intelligence.
Zongtian Liu received his MS from Beijing University of Aeronautics and Astronautics, China in 1982. His research interests are artificial intelligence and software engineering.
Yun Hu received her PhD in Computer Science from Nanjing University, China in 2013. Her research interests are social network analysis and artificial intelligence.
Cunhua Li received his PhD from Southeast University, China in 2007. His research interests are data mining and knowledge engineering.
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Zhong, Z., Liu, Z., Hu, Y. et al. Efficient multi-event monitoring using built-in search engines. Front. Comput. Sci. 10, 281–291 (2016). https://doi.org/10.1007/s11704-015-4432-3
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DOI: https://doi.org/10.1007/s11704-015-4432-3