Autonomous citation indexing and literature browsing using citation context

• US 6,738,780 B2
• Filed: 05/16/2001
• Issued: 05/18/2004
• Est. Priority Date: 01/05/1998
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Laboratories America Inc (NEC Corporation)
• Inventors: Lawrence, Stephen R., Giles, C. Lee, Bollacker, Kurt D.
• Primary Examiner(s): Pardo, Thuy N.
• Application Number:
  US09/859,031
• Publication Number:
  US 20020156760A1
• Time in Patent Office: 1,098 Days
• Field of Search: 707/2, 707/3, 707/5, 707/101, 707/102, 707/7, 345/810, 715/532
• US Class Current: 707/722
• CPC Class Codes: G06F 16/382 using citations hypermedia G06F16/94
• CPC Class Codes: G06F 16/951 Indexing; Web crawling techniques
• CPC Class Codes: Y10S 707/99932 Access augmentation or optimizing
• CPC Class Codes: Y10S 707/99933 Query processing, i.e. searching
• CPC Class Codes: Y10S 707/99935 Query augmenting and refining, e.g. inexact access
• CPC Class Codes: Y10S 707/99936 Pattern matching access
• CPC Class Codes: Y10S 707/99937 Sorting
• CPC Class Codes: Y10S 707/99942 Manipulating data structure, e.g. compression, compaction, compilation
• CPC Class Codes: Y10S 707/99943 Generating database or data structure, e.g. via user interface

Abstract

An autonomous citation indexing system which can be used as an assistant agent automates and enhances the task of finding publications in electronic form, including publications located on the world wide web. The system parses citations from papers and identifies citations to the same paper that may differ in syntax. The system also extracts and provides the context of citations to a given paper, allowing a researcher to determine what is published in other papers about a given paper. Common citations and word or string vector distance similarity are used to find related articles in a search.

Claims

1. A computer-implemented citation indexing system comprising:

means for locating and acquiring publications in electronic format;

a document parser for extracting semantic features, including citations, from acquired publications; and

means for autonomously identifying variant forms of citations to the same publication,

where said means for autonomously identifying variant forms of citations to the same publication normalizes citations, sorts citations by length and processes citations in order beginning with the longest length citation, computes distance measures to all previously identified groups of citations for each citation, and either adds the citation to an existing group or creates a new group, where said distance measure comprises word matching.

2. A computer-implemented citation indexing system as set forth in claim 1, where said means for autonomously identifying variant forms of citations to the same publication normalizes citations, sorts citations by length and processes citations in order beginning with the longest length citation, computes distance measures to all previously identified groups of citations for each citation, and either adds the citation to an existing group or creates a new group, where said distance measure comprises word and phrase matching.

3. A computer-implemented citation indexing system as set forth in claim 1, where said means for autonomously identifying variant forms of citations to the same publication normalizes citations, sorts citations by length and processes citations in order beginning with the longest length citation, computes distance measures to all previously identified groups of citations for each citation, and either adds the citation to an existing group or creates a new group, where said distance measure comprises word matching and where said publications in electronic format are publications on the world wide web.

4. A computer-implemented citation indexing system as set forth in claim 2, where said means for autonomously identifying variant forms of citations to the same publication normalizes citations, sorts citations by length and processes citations in order beginning with the longest length citation, computes distance measures to all previously identified groups of citations for each citation, and either adds the citation to an existing group or creates a new group, where said distance measure comprises word and phrase matching and where said publications in electronic format are publications on the world wide web.

5. A method of computer-implemented citation indexing for identifying different forms of citations to the same publication comprising the steps of:

searching for desired publications in electronic format;

locating and acquiring the desired publications;

parsing the acquired publications for extracting and storing semantic features, including citations, from the acquired publications; and

autonomously identifying variant forms of citations to the same publication,

said autonomously identifying variant forms of citations to the same publication comprising normalizing citations, sorting citations by length and processing citations in order beginning with the longest length citation, computing for each citation, distance measures to all previously identified groups of citations, and either adding the citation to an existing group or creating a new group, where said computing distance measures comprises word matching.

6. A method of computer-implemented citation indexing as set forth in claim 5, said autonomously identifying variant forms of citations to the same publication comprising normalizing citations, sorting citations by length and processing citations in order beginning with the longest length, computing for each citation, distance measures to all previously identified groups of citations, and either adding the citation to an existing group or creating a new group, where said computing distance measures comprises word and phrase matching.

7. A method of computer-implemented citation indexing as set forth in claim 5, said autonomously identifying variant forms of citations to the same publication comprising normalizing citations, sorting citations by length and processing citations in order beginning with the longest length citation, computing for each citation, distance measures to all previously identified groups of citations, and either adding the citation to an existing group or creating a new group, where said computing distance measures comprises word matching and where said publications in electronic format are publications on the world wide web.

8. A method of computer-implemented citation indexing as set forth in claim 5, said autonomously identifying variant forms of citations to the same publication comprising normalizing citations, sorting citations by length and processing citations in order beginning with the longest length, computing for each citation, distance measures to all previously identified groups of citations, and either adding the citation to an existing group or creating a new group, where said computing distance measures comprises word and phrase matching and where said publications in electronic format are publications on the world wide web.