Thesis (Ph.D.)--Hong Kong University of Science and Technology, 2006. / Includes bibliographical references (leaves 144-146). Also available in electronic version.

published_or_final_version / abstract / Computer Science / Master / Master of Philosophy

Thesis (M. Phil.)--University of Hong Kong, 2007. / Title proper from title frame. Also available in printed format.

Thesis (M.S.)--Worcester Polytechnic Institute. / Keywords: streaming query; query processing; database. Includes bibliographical references (p. 57-59).

The prevalence of graphs in emerging applications has recently raised a lot of research interests. To acquire interesting information hidden in large graphs, tasks including link prediction, collaborative recommendation, and reputation ranking, all make use of proximities between graph nodes. The discounted hitting time (DHT), which is a random-walk similarity measure for graph node pairs, has shown to be useful in various applications. In this thesis, we examine a novel query, called the multi-way join (or n-way join), over DHT scores. Given a graph and n sets of nodes, the n-way join retrieves a ranked list of n-tuples with the k highest scores, according to some aggregation function of DHT values. By extracting such top-k results, this query enables the analysis and prediction of various complex relationships among n sets of nodes on a large graph. Since an n-way join is expensive to evaluate, we develop the Partial Join algorithm (or PJ). This solution decomposes an n-way join into a number of top-m 2-way joins, and combines their results to construct the answer of the n-way join. Since the process of PJ may necessitate the computation of top-(m + 1) 2-way joins, we study an incremental solution, which saves the trouble of recomputation and allows the results of top-(m+1) 2-way join to be derived quickly from the top-m 2-way join results earlier computed. For better performance, we further examine efficient processing algorithms and pruning techniques for 2-way joins. Through extensive experiments on three real graph datasets, we show that the proposed PJ algorithm accurately evaluates n-way joins, and is four orders of magnitude faster than basic solutions. / published_or_final_version / Computer Science / Master / Master of Philosophy

Thesis (M.S.)--Worcester Polytechnic Institute. / Keywords: reordering predicates; multi-join operator; sliding windows; window predicates; join algorithm; continuous queries. Includes bibliographical references (p. 101-103).

Thesis (M.S.) in Spatial Information Science and Engineering--University of Maine, 2003. / Includes vita. Includes bibliographical references (leaves 86-91).

Thesis (Ph.D.)--Hong Kong University of Science and Technology, 2005. / Vita. Includes bibliographical references (leaves 136-145). Also available in electronic version.

Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2005. / Includes bibliographical references (leaves 47-50). Also available in electronic version.

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