TAILIEUCHUNG - Báo cáo khoa học: "A Mobile Touchable Application for Online Topic Graph Extraction and Exploration of Web Content"

We present a mobile touchable application for online topic graph extraction and exploration of web content. The system has been implemented for operation on an iPad. The topic graph is constructed from N web snippets which are determined by a standard search engine. We consider the extraction of a topic graph as a specific empirical collocation extraction task where collocations are extracted between chunks. | A Mobile Touchable Application for Online Topic Graph Extraction and Exploration of Web Content Gunter Neumann and Sven Schmeier Language Technology Lab DFKI GmbH Stuhlsatzenhausweg 3 D-66123 Saarbriicken neumann schmeier @ Abstract We present a mobile touchable application for online topic graph extraction and exploration of web content. The system has been implemented for operation on an iPad. The topic graph is constructed from N web snippets which are determined by a standard search engine. We consider the extraction of a topic graph as a specific empirical collocation extraction task where collocations are extracted between chunks. Our measure of association strength is based on the pointwise mutual information between chunk pairs which explicitly takes their distance into account. An initial user evaluation shows that this system is especially helpful for finding new interesting information on topics about which the user has only a vague idea or even no idea at all. 1 Introduction Today s Web search is still dominated by a document perspective a user enters one or more keywords that represent the information of interest and receives a ranked list of documents. This technology has been shown to be very successful when used on an ordinary computer because it very often delivers concrete documents or web pages that contain the information the user is interested in. The following aspects are important in this context 1 Users basically have to know what they are looking for. 2 The documents serve as answers to user queries. 3 Each document in the ranked list is considered independently. If the user only has a vague idea of the information in question or just wants to explore the infor 20 mation space the current search engine paradigm does not provide enough assistance for these kind of searches. The user has to read through the documents and then eventually reformulate the query in order to find new information. This can be a tedious task especially on .

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