Information retrieval technology refers to the operation mode and rules that the computer compares and matches the input retrieval expression (retrieval problem) with the document information feature identification and its logical combination stored in the retrieval system.
Information retrieval technology mainly includes Boolean logic retrieval, location retrieval, word truncation retrieval and field restriction retrieval. Information retrieval refers to the process and technology of organizing information in a certain way and finding out relevant information according to the needs of information users.
The three basic steps of information retrieval are subject analysis, selecting retrieval system and extracting retrieval words.
1. The basic steps of information retrieval are subject analysis, selecting retrieval system, extracting retrieval words, constructing retrieval formula, literature retrieval, adjusting retrieval formula and processing retrieval results. Information retrieval is the main way for users to query and obtain information, and it is also the method and means to find information.
2. Narrow information retrieval only refers to information inquiry. In other words, users can use certain methods and retrieval tools to find the information they need from the information collection according to their own needs.
3. Information retrieval in a broad sense is a process of processing, sorting, organizing and storing information in a certain way, and then accurately finding out relevant information according to the specific needs of information users. Also known as information storage and retrieval. Generally speaking, information retrieval refers to information retrieval in a broad sense.
4. Information retrieval usually refers to text information retrieval, including information storage, organization, performance, query and access, and its core is the indexing and retrieval of text information.
The development of information retrieval;
It first developed in the second half of19th century, and by the 1940s, indexing and retrieval had become an independent tool and user service project of libraries. With the advent of the first electronic computer in the world in 1946, computer technology gradually entered the field of information retrieval, and was closely combined with information retrieval theory.
In recent years, with the comprehensive popularization of computer networks, multimedia information retrieval has developed rapidly. Information retrieval has experienced many stages of development, such as manual retrieval, computer retrieval, network retrieval and intelligent retrieval.