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Moody's Investors Service â¦â¦. ``Dynegy has to act fast,'' said Roger. Hamilton, a money manager with John. Hancock Advisers Inc.

Mining Unstructured Data Ronen Feldman Computer Science Department Bar-Ilan University, ISRAEL

ClearForest Corporation [email protected]

Outline

Introduction to Text Mining Information Extraction

Entity Extraction Relationship Extraction KE Approach IE Languages ML Approaches to IE

Link Detection

Introduction to LD Architecture of LD systems 9/11 Link Analysis Demos

HMM

Anaphora resolution Evaluation 2

Background

Rapid proliferation of information available in digital format

People have less time to absorb more information

3

The Information Landscape

4

Actual information buried inside documents

Extract Information from within the documents

Long lists of documents

Aggregate over entire collection

5

Text Mining

6

! Text Mining

Find Material Read Understand Consolidate Absorb / Act 7

What Is Unique in Text Mining?

Feature extraction. Very large number of features that represent each of the documents. The need for background knowledge. Even patterns supported by small number of document may be significant. Huge number of patterns, hence need for visualization, interactive exploration. 8

Document Types

Structured documents

Semi-structured documents

Output from CGI Seminar announcements Job listings Ads

Free format documents

News Scientific papers

9

Text Representations

Character Trigrams Words Linguistic Phrases Non-consecutive phrases Frames Scripts Role annotation Parse trees 10

The 100,000 foot Picture

Development Evironment

11

Intelligent Auto-Tagging Finsbury Park Mosque (c) 2001, Chicago Tribune. Visit the Chicago Tribune on the Internet at http://www.chicago.tribune.com/ Distributed by Knight Ridder/Tribune Information Services. By Stephen J. Hedges and Cam Simpson

England

…….

United States

The Finsbury Park Mosque is the center of radical Muslim activism in England. Through its doors have passed at least three of the men now held on suspicion of terrorist activity in France, England and Belgium, as well as one Algerian man in prison in the United States. ``The mosque's chief cleric, Abu Hamza alMasri lost two hands fighting the Soviet Union in Afghanistan and he advocates the elimination of Western influence from Muslim countries. He was arrested in London in 1999 for his alleged involvement in a Yemen bomb plot, but was set free after Yemen failed to produce enough evidence to have him extradited. .'' ……

France England Belgium

Abu Hamza al-Masri