Huang Ruizhang. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2003. / Includes bibliographical references (leaves 110-114). / Abstracts in English and Chinese. / Abstract --- p.i / Acknowledgement --- p.iv / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- The Defitition of Topic and Event --- p.2 / Chapter 1.2 --- Event and Topic Discovery --- p.2 / Chapter 1.2.1 --- Problem Definition --- p.2 / Chapter 1.2.2 --- Characteristics of the Discovery Problems --- p.3 / Chapter 1.2.3 --- Our Contributions --- p.5 / Chapter 1.3 --- Story Link Detection --- p.5 / Chapter 1.3.1 --- Problem Definition --- p.5 / Chapter 1.3.2 --- Our Contributions --- p.6 / Chapter 1.4 --- Thesis Organization --- p.7 / Chapter 2 --- Literature Review --- p.8 / Chapter 2.1 --- University of Massachusetts (UMass) --- p.8 / Chapter 2.1.1 --- Topic Detection Approach --- p.8 / Chapter 2.1.2 --- Story Link Detection Approach --- p.9 / Chapter 2.2 --- BBN Technologies --- p.10 / Chapter 2.3 --- IBM Research Center --- p.11 / Chapter 2.4 --- Carnegie Mellon University (CMU) --- p.12 / Chapter 2.4.1 --- Topic Detection Approach --- p.12 / Chapter 2.4.2 --- Story Link Detection Approach --- p.14 / Chapter 2.5 --- National Taiwan University (NTU) --- p.14 / Chapter 2.5.1 --- Topic Detection Approach --- p.14 / Chapter 2.5.2 --- Story Link Detection Approach --- p.15 / Chapter 3 --- System Overview --- p.17 / Chapter 3.1 --- News Sources --- p.18 / Chapter 3.2 --- Story Preprocessing --- p.24 / Chapter 3.3 --- Information Extraction --- p.25 / Chapter 3.4 --- Gloss Translation --- p.26 / Chapter 3.5 --- Term Weight Calculation --- p.30 / Chapter 3.6 --- Event And Topic Discovery --- p.31 / Chapter 3.7 --- Story Link Detection --- p.33 / Chapter 4 --- Event And Topic Discovery --- p.34 / Chapter 4.1 --- Overview of Event and Topic discovery --- p.34 / Chapter 4.2 --- Event Discovery Component --- p.37 / Chapter 4.2.1 --- Overview of Event Discovery Algorithm --- p.37 / Chapter 4.2.2 --- Similarity Calculation --- p.39 / Chapter 4.2.3 --- Story and Event Combination --- p.43 / Chapter 4.2.4 --- Event Discovery Output --- p.44 / Chapter 4.3 --- Topic Discovery Component --- p.45 / Chapter 4.3.1 --- Overview of Topic Discovery Algorithm --- p.47 / Chapter 4.3.2 --- Relevance Model --- p.47 / Chapter 4.3.3 --- Event and Topic Combination --- p.50 / Chapter 4.3.4 --- Topic Discovery Output --- p.50 / Chapter 5 --- Event And Topic Discovery Experimental Results --- p.54 / Chapter 5.1 --- Testing Corpus --- p.54 / Chapter 5.2 --- Evaluation Methodology --- p.56 / Chapter 5.3 --- Experimental Results on Event Discovery --- p.58 / Chapter 5.3.1 --- Parameter Tuning --- p.58 / Chapter 5.3.2 --- Event Discovery Result --- p.59 / Chapter 5.4 --- Experimental Results on Topic Discovery --- p.62 / Chapter 5.4.1 --- Parameter Tuning --- p.64 / Chapter 5.4.2 --- Topic Discovery Results --- p.64 / Chapter 6 --- Story Link Detection --- p.67 / Chapter 6.1 --- Topic Types --- p.67 / Chapter 6.2 --- Overview of Link Detection Component --- p.68 / Chapter 6.3 --- Automatic Topic Type Categorization --- p.70 / Chapter 6.3.1 --- Training Data Preparation --- p.70 / Chapter 6.3.2 --- Feature Selection --- p.72 / Chapter 6.3.3 --- Training and Tuning Categorization Model --- p.73 / Chapter 6.4 --- Link Detection Algorithm --- p.74 / Chapter 6.4.1 --- Story Component Weight --- p.74 / Chapter 6.4.2 --- Story Link Similarity Calculation --- p.76 / Chapter 6.5 --- Story Link Detection Output --- p.77 / Chapter 7 --- Link Detection Experimental Results --- p.80 / Chapter 7.1 --- Testing Corpus --- p.80 / Chapter 7.2 --- Topic Type Categorization Result --- p.81 / Chapter 7.3 --- Link Detection Evaluation Methodology --- p.82 / Chapter 7.4 --- Experimental Results on Link Detection --- p.83 / Chapter 7.4.1 --- Language Normalization Factor Tuning --- p.83 / Chapter 7.4.2 --- Link Detection Performance --- p.90 / Chapter 7.4.3 --- Link Detection Performance Breakdown --- p.91 / Chapter 8 --- Conclusions and Future Work --- p.95 / Chapter 8.1 --- Conclusions --- p.95 / Chapter 8.2 --- Future Work --- p.96 / Chapter A --- List of Topic Title Annotated for TDT3 corpus by LDC --- p.98 / Chapter B --- List of Manually Annotated Events for TDT3 Corpus --- p.104 / Bibliography --- p.114