Date: Sat Mar 22 06:45:05 2008

Title: Master Thesis: Studies on Variable Ordering of Zero-suppressed Binary Decision Diagrams for Database Analysis (in Japanese)

Authors: Haruya Iwasaki


  • First name: Haruya
  • Last name: Iwasaki
  • Address: Division of Computer Science, Hokkaido University, North 14, West 9, Sapporo 060-0814, Japan
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Abstract. Recently, an efficient method of database analysis using Zero-suppressed Binary Decision Diagrams(ZBDDs) has been proposed. BDDs are a graph-based representation of Boolean functions, now widely used in system design and verification. Here we focus on ZBDDs, a special type of BDDs, which are suitable for handling large-scale combinatorial itemsets in transaction databases. the ZBDD size greatly depends on the variable ordering used. In this paper, we propose a new method of ZBDD variable ordering for itemset mining of large-scale transaction databases, and show experimental results. Moreover, we consider the effieciency of this new method by comparing with frequency-based methods.

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