Robert Wing Pong Luk

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Pattern discovery from time series is of fundamental importance. Particularly when the domain expert derived patterns do not exist or are not complete, an algorithm to discover specific patterns or shapes automatically from the time series data is necessary. Such an algorithm is noteworthy in that it does not assume prior knowledge of the number of(More)
In an ad-hoc retrieval task, the query is usually short and the user expects to find the relevant documents in the first several result pages. We explored the possibilities of using Wikipedia's articles as an external corpus to expand ad-hoc queries. Results show promising improvements over measures that emphasize on weak queries.
Introduction This is my personal " summary in 337 one-liners " of A Survey in Indexing and Searching XML Documents by Luk et al. (2002) [1]. I focus on technical aspects, omitting all system names and references. In my opinion, one cannot learn any technique from the survey: it only mentions various techniques but does not explain any. Alas, my 337(More)
In our formal runs, we have experimented with the retrieval based on character-based indexing and hybrid term indexing because these are more distinct types of indexing for better pooling. We confirmed that character-based indexing did not produce relatively good retrieval effectiveness. We have also experimented with three new pseudo-relevance feedback(More)