This directory contains the PostScript copy of my Ph.D. dissertation, entitled "Automatic Lexicon Acquisition and Precision-Recall Maximization for Untagged Text Corpora" (Chinese Title: 詞彙自動抽取及最佳化技術之研究). All materials here are copyrighted. Photo coping and redistribution of the materials are granted only for personal, research and non-commercial purposes. For other publication purposes, explicit written permission from the author is required.