Keyword is a new vocabulary of information retrieval language, which is used to describe the theme of literature and give information retrieval. It is precisely because of its appearance and development that it is possible to computerize information retrieval (computer retrieval).
Keywords refer to words or phrases that distinguish things by the characteristic relationship of concepts, express in natural language, have collocation function and accurately express the dynamic semantic conceptual relationship between words.
For example: plasma application, one of the key words. It has the characteristics of concept, which shows that it is nothing more than plasma application, using natural language vocabulary.
Keywords are keywords that mark the subject content of document construction, but have not been standardized. Like, keys? Quot atomic energy (the key word of its specification may be nuclear energy). Keywords are words or terms selected from papers for document indexing to express the main contents and information items of the full text. A paper can choose 3~8 words as keywords.
[example]
Thesis title: A new synthesis method of antenna array pattern.
Keywords: antenna array; Directional map; Comprehensive; Mutual coupling; Dipole; English translation of input impedance (***6);
Title: A New Synthesis Method of Array Pattern
Keywords: antenna array; Pattern; Synthesis; Mutual coupling; Dipole;
Input disorder
The general selection method of keywords or subject words is: after the author finishes writing the paper, read the full text and first think of information or vocabulary that can express the main content of the paper. These residences or words can be found and selected from the title of the paper and the content of the paper. For example, in the last example, six keywords were selected, of which the first three were selected from the topic of the paper and the last three were selected from the content of the paper. The selection of the last three keywords supplements the main content information that the title of the paper fails to express, and also improves the conceptual depth involved. For example, the research of antenna array pattern synthesis method (the topic of the above paper) involves concepts such as mutual coupling, dipole and input impedance. The words used in these concepts appear frequently and have key physical significance, so they need to be selected together with the keywords selected from the topic to form the keyword group of this paper.
The use of keywords and subject words is mainly to meet the needs of computer retrieval and international computer online retrieval. Adding keywords to publications opens up a new way for publications to improve their citation rate and increase their popularity.