SYSTEM, METHOD AND USER INTERFACE FOR RETRIEVING DOCUMENTS

• US 20070244881A1
• Filed: 01/10/2007
• Published: 10/18/2007
• Est. Priority Date: 04/13/2006
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ahn, Han Joon, Kim, Jeong Joong, Cha, Wan Kyu
• Granted Patent: US 8,200,695 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 16/3334 Selection or weighting of terms from queries, including natural language queries

Abstract

Provided is a system of retrieving a document. The system includes a DB storing a document, a document feature writing unit, a query input unit, a keyword extraction unit, a weighting unit, a document retrieving unit, and an output unit. The document feature writing unit extracts attribute information of the document stored in the document DB and writes an index for the document based on the attribute information. The query input unit receives a query input by a user. The keyword extraction unit extracts a keyword from the query. The weighting unit assigns a weight to the extracted keyword using the index. The document retrieving unit retrieves a similar document using the keyword with the assigned weight. The output unit displays the similar document retrieved by the document retrieving unit to a user.

Claims

1. A system of retrieving a document, the system comprising:

a database storing a document;

a document feature writing unit extracting attribute information of the document stored in the document database and writing an index for the document based on the attribute information;

a query input unit receiving a query input by a user;

a keyword extraction unit extracting a keyword from the query;

a weighting unit assigning a weight to the extracted keyword using the index;

a document retrieving unit retrieving a similar document using the keyword with the assigned weight; and

an output unit displaying the similar document retrieved by the document retrieving unit to a user.

2. The system according to claim 1, wherein the document feature writing unit obtains a text from documents stored in the document database to write index information for an occurrence frequency of each keyword.

3. The system according to claim 1, further comprising:

a document feature database storing an index written by the document feature writing unit; and

a similar word extraction unit extracting a feature keyword of each document from the index stored in the document feature database,

wherein the similar word extraction unit determines a feature vector including an evaluation value of the keyword, and the evaluation value is an occurrence frequency of the keyword for each document.

4. The system according to claim 3, wherein predetermined keywords A and B are clustered by the similar word extraction unit, and

when any one of the keywords A and B is included in keywords extracted by the keyword extraction unit, the document retrieving unit retrieves even similar documents including the other keyword.

5. The system according to claim 4, further comprising a similar word database storing keywords clustered by the similar word extraction unit,

wherein the document retrieving unit retrieves the similar documents with reference to the similar word database.

6. The system according to claim 1, wherein the output unit provides various kinds of user interface to a client connected through a network, and

the user interface is an environment where a user inputs a query through various routes, and includes one of a first user interface where a query is input in sentence units, a second user interface where retrieved documents are used as a query, and a third user interface where a query is input by attaching or uploading a text file.

7. The system according to claim 6, wherein, when a user attaches or uploads a predetermined file using the third user interface, the query input unit monitors a format of the attached or uploaded file to receive only a file of a specific format.

8. The system according to claim 1, wherein the weight assigned to each keyword by the weighting unit is provided to a user through the output unit, and

the provided keyword and the assigned weight are modifiable.

9. A method of retrieving a document, the method comprising:

receiving a query input by a user through a query input unit;

extracting a keyword from the query;

weighting each keyword; and

retrieving a similar document based on the weighted keyword,

wherein the weight assigned to the keyword reflects an occurrence frequency of the keyword of each document using an index of feature information of documents stored in a document database.

10. The method according to claim 9, further comprising:

obtaining a text from the documents stored in the document database to write index information for the occurrence frequency of each keyword; and

determining a feature vector including an evaluation value for each keyword using the occurrence frequency of the keyword of each document,

before the weighting of each keyword.

11. The method according to claim 10, wherein keywords having a predetermined or higher occurrence frequency of keywords of each document are clustered as related terms, and

a document including the related terms is retrieved in the retrieving of the similar document.

12. The method according to claim 9, wherein one of a first user interface where a query is input in sentence units, a second user interface where retrieved documents are used as a query, and a third user interface where a query is input by attaching or uploading a text file is provided to a user by an output unit providing a user interface,

before the receiving of the query input by a user through the query input unit.

13. The method according to claim 12, wherein, when a user attaches or uploads a predetermined file using the third user interface, the query input unit monitors a format of the attached or uploaded file to receive only a file of a specific format.

14. A user interface provided to a user for document retrieval so as to input a query through various routes, wherein two or more user interfaces are provided to a user, the two or more user interfaces being selected from the group consisting of a first user interface where a query is input in sentence units, a second user interface where retrieved documents are used as a query, and a third user interface where a query is input by attaching or uploading a text file.

15. The user interface according to claim 14, wherein the first to third use interfaces include a query inquiring unit for confirming/modifying information for keywords extracted from the input query and weight of each keyword.

16. The user interface according to claim 14, wherein a message showing that a morphologically analyzable file is attachable or uploadable is displayed on the third user interface.