東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Beyond keywords: finding information...

Lease, Matthew.

Linked to FindBook

Google Book

Amazon

博客來

Beyond keywords: finding information more accurately and easily using natural language.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Beyond keywords: finding information more accurately and easily using natural language./
Author:	Lease, Matthew.
Description:	118 p.
Notes:	Source: Dissertation Abstracts International, Volume: 71-11, Section: B, page: .
Contained By:	Dissertation Abstracts International71-11B.
Subject:	Information Technology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3430102
ISBN:	9781124304298

Beyond keywords: finding information more accurately and easily using natural language.
Lease, Matthew.

Beyond keywords: finding information more accurately and easily using natural language. - 118 p.

Source: Dissertation Abstracts International, Volume: 71-11, Section: B, page: .

Thesis (Ph.D.)--Brown University, 2010.

Information retrieval (IR) has become a ubiquitous technology for quickly and easily finding information on a given topic amidst the wealth of digital content available today. This dissertation addresses search for written and spoken natural language documents, including news articles, Web pages, and spoken interviews. Effective model estimation is identified as a key problem, and several novel estimation techniques are presented and shown to significantly enhance search accuracy.

ISBN: 9781124304298Subjects--Topical Terms:

1030799
Information Technology.

Beyond keywords: finding information more accurately and easily using natural language.
LDR:03392nam 2200337 4500 001 1394168
005 20110419113616.5
008 130515s2010 ||||||||||||||||| ||eng d
020 $a 9781124304298
035 $a (UMI)AAI3430102
035 $a AAI3430102
040 $a UMI $c UMI
100 1 $a Lease, Matthew. $3 1672770
245 1 0 $a Beyond keywords: finding information more accurately and easily using natural language.
300 $a 118 p.
500 $a Source: Dissertation Abstracts International, Volume: 71-11, Section: B, page: .
500 $a Adviser: Eugene Charniak.
502 $a Thesis (Ph.D.)--Brown University, 2010.
520 $a Information retrieval (IR) has become a ubiquitous technology for quickly and easily finding information on a given topic amidst the wealth of digital content available today. This dissertation addresses search for written and spoken natural language documents, including news articles, Web pages, and spoken interviews. Effective model estimation is identified as a key problem, and several novel estimation techniques are presented and shown to significantly enhance search accuracy.
520 $a While search is typically performed via a few carefully chosen keywords, formulating effective keyword queries is often unintuitive and iterative, particularly when seeking complex information. As an alternative to keyword search, this dissertation investigates search using "natural" queries, such as questions or sentences a person might naturally articulate in communicating their information need to another person. By moving toward supporting natural queries, the communication burden is shifted from user query formulation to system interpretation of natural language. The challenge in enacting such a shift is enabling automatic IR systems to more effectively cope with natural language. To this end, several new estimation techniques for modeling natural queries are described. In comparison to a maximum likelihood baseline, 15-20% relative improvement in mean-average precision (MAP) is demonstrated without use of query expansion.
520 $a When an IR system discovers or is provided one or more feedback documents exemplifying a user's information need, there is further opportunity to improve search accuracy by exploiting document contents for query expansion. However, since documents typically discuss multiple topics varying in importance and relevance to any information need, the system must again be able to effectively interpret verbose natural language. Consequently, an estimation method for leveraging such documents is presented and shown to yield state-of-the-art search accuracy. Depending on the base model employed, 15-85% relative MAP improvement is achieved.
520 $a When modeling higher-order lexical features or searching smaller document collections like cultural history archives, sparsity become particularly problematic for estimation. To cope with such sparsity, additional estimation methods are described which yield 5-20% relative improvement in MAP accuracy across varying conditions of query verbosity.
590 $a School code: 0024.
650 4 $a Information Technology. $3 1030799
650 4 $a Information Science. $3 1017528
650 4 $a Artificial Intelligence. $3 769149
650 4 $a Computer Science. $3 626642
690 $a 0489
690 $a 0723
690 $a 0800
690 $a 0984
710 2 $a Brown University. $3 766761
773 0 $t Dissertation Abstracts International $g 71-11B.
790 1 0 $a Charniak, Eugene, $e advisor
790 $a 0024
791 $a Ph.D.
792 $a 2010
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3430102