What is the basic information about literature search? What is literature information retrieval?

Literature information retrieval has two meanings: broad and narrow. Literature information retrieval in a broad sense includes two blink delivery processes: storage and search of literature information. Literature information storage is the process of collecting, indexing and describing literature information, and arranging it in an orderly manner, and compiling it into a literature information retrieval system.

Literature information search is the process of finding out the specific information required by users from a large number of literature information, that is, comparing the question characteristics that express the user's information needs with the identification in the retrieval system, so as to find out the consistent information from it.

With the development of computer technology, literature information retrieval has entered the stage of computerization from manual retrieval, and is developing in the direction of information processing automation and retrieval of whole culture, intelligence and networking, and its retrieval content, application field and popularization scope are also rapidly expanding. Due to the diverse information needs of users, information retrieval technology is constantly evolving, resulting in many types of information retrieval. According to the search object, it can be divided into data search, fact search and literature search. According to the retrieval method, it is divided into manual information retrieval and computer information retrieval; According to the search requirements, it can be divided into strong correlation search and weak correlation search. According to the nature of the search, it can be divided into topical search and retrospective search. According to the form of retrieved information, it is divided into text search and multi-** search.

Literature retrieval (information retrieval) refers to the process of organizing and storing information in a certain way, and finding out the relevant information according to the needs of information users, so its full name is also called "information storage and retrieval", which is information retrieval in a broad sense. Information retrieval in the narrow sense refers only to the second half of the process, that is, the process of finding the required information from the information collection, which is equivalent to what people usually call information search.

Data retrieval is a process or technology that stores selected, collated, and evaluated (identified) data into a certain carrier, and retrieves accurate data from a certain data set according to the user's needs. According to the requirements of the query problem, it is divided into simple search (i.e., single factor search) and comprehensive search (i.e., comprehensive condition search). The technical methods of data retrieval vary depending on how data files are organized.

For sequential structure files, common methods include sequential search, block search, and two-part search. For random-structured files, the direct address method, hash method, etc. are often used. Spatial data retrieval in GIS often involves the comprehensive conditions of the spatial distribution range of the target (administrative area, geographical scope or spatial relationship, etc.) and the type of target attributes (terrain height, slope, land use status, etc.).

Fact retrieval is a type of intelligence retrieval. Fact retrieval in a broad sense includes the retrieval, arithmetic, comparison, and mathematical derivation of numerical data, as well as the retrieval, comparison, deduction, and logical reasoning of non-numerical data (such as facts, concepts, ideas, knowledge, etc.). It requires the retrieval system to be able to not only find out the data or facts that were originally stored in the data (facts) collection, but also be able to deduce, deduce, or create new data or facts from the existing basic data or facts.

For example, the following facts are stored in the system: Li Ming is a student at School A. A School students all learn foreign languages.

If the system is a fact retrieval system, it should be able to ask a user "Does Li Ming learn a foreign language?" "This kind of shirt pie makes problems. Fact retrieval is one of the most complex types of intelligence retrieval.

It requires that the data and facts in the system be stored in or close to natural language. It is necessary to store not only the various data or fact units, but also the semantic and syntactic relationships between the units, as well as various relevant background knowledge. Allows users to ask questions in natural language and be able to answer in natural language.

More importantly, the system must have certain logical reasoning ability and natural language understanding capabilities.

2. You can directly enter the content in the search bar on the homepage of CNKI to search, or you can select the full text, subject, title, author, abstract, etc., and then enter the keyword vocabulary to search, or you can click the advanced search on the right to filter the detailed conditions.

Approaches to literature search: common law, retrospective and segmented.

1. Common law.

It is a method of searching for literature using bibliography, abstracts, indexes and other search tools. The key to using this method is to be familiar with the nature, characteristics and search process of various search tools, and to search from different angles. The common law can be further divided into the method of forward inspection and the method of reverse inspection.

2. Retrospective method.

It is a method of using the references attached to the existing literature to continuously track and search, when there is no search tool or the search tool is incomplete, this method can obtain highly targeted data, the accuracy rate is high, and the recall rate is poor.

3. Segmentation method.

It is a combination of retrospective and common law, which alternates the two methods in stages and segments until the required information is found.

Information retrieval originated from the library's reference reference and abstract indexing work, which first developed in the second half of the 19th century, and by the 40s of the 20th century, indexing and retrieval had become an independent tool and user service for the library.

With the advent of the world's first electronic computer in 1946, computer technology gradually entered the field of information retrieval and was closely integrated with information retrieval theory. The offline batch intelligence retrieval system and the online real-time intelligence retrieval system have been successfully developed and commercialized.

From the 60s to the 80s of the 20th century, under the impetus of information processing technology, communication technology, computer and database technology, information retrieval has developed rapidly in various fields such as education, military and commerce, and has been widely used. The Dialog International Online Information Retrieval System is representative of the field of information retrieval during this period and is still one of the most famous systems in the world.

Top 10 Literature Types: Periodicals, Patent Literature, Standard Literature, Rang Qi Degree**, Conference Literature, Books, Scientific and Technological Reports, Product Materials, Technical Archives, **Publications.

Literature retrieval system.

Literature retrieval system refers to a hierarchical system established in a certain way and method for readers to check information, and is a collection of information characteristics that characterize and order.

In this ensemble, the external characteristics and content characteristics of the information included are described in detail as needed, and each description record (i.e., paragraph) is marked with an identifier that can be retrieved, arranged in a certain sequence, scientifically organized into an organic whole, and at the same time should have a variety of necessary retrieval methods. Among them, the secondary literature information, Tanfuling or tertiary literature information, is the core and summary of the literature information system.