(1) is taken from the title of the paper.
The title of a scientific paper contains the main information points of the paper, such as the research object and research methods. Therefore, the selection of keywords should first consider the selection from the title.
(2) Excerpts from the paper
When extracting keywords, the author of the paper can analyze the theme of the document, find out the theme concept and central content of the paper, and extract words and phrases consistent with the theme concept from the title, abstract, hierarchical title and important paragraphs of the text as much as possible, so as to extract the keywords of the paper.
Secondly, from the perspective of words, the author can extract keywords from two aspects: changing concepts and applying vocabulary.
(1) concept transformation
In order to express the theme more accurately and appropriately, it is often necessary to transform the concept of the theme. The conversion of the theme concept should be carried out not only literally, but also in the sense of the theme concept, so we should pay special attention to the comprehensive analysis of the concept.
(2) Application of thesaurus
Many people have a certain degree of randomness in the choice of keywords in their papers, and do not choose keywords suitable for their papers according to the existing list of keywords in medical papers. Therefore, in the process of writing academic papers, we can determine keywords according to "net" vocabulary.
Finally, in order to avoid some common mistakes in keyword extraction, the author should pay attention to the following problems.
(1) You must choose a word or phrase with clear meaning.
When selecting keywords, we should eliminate adjectives or phrases with vague concepts. Like what? Strong? 、? Strong? 、? Advanced? 、? Modern? 、? Miniature? 、? Accuracy? Wait a minute. The concept of commonly used verbs is also broader. Therefore, verbs used as keywords are generally scientific verbs, and it is best not to use ordinary verbs as keywords.
(2) The selected keywords must be consistent with the theme of the paper.
In other words, you can't just use the words in the title of the paper as keywords. You must consider whether the selected keywords conform to the theme of the paper, and only those that conform to the theme of the paper can be selected.
(3) Some words and symbols cannot be used as keywords.
Synonyms and synonyms can't be used as keywords in parallel, and chemical molecular formulas can't be used as keywords, but complex organic compounds can be selected as keywords through the names of basic structures.
The above is about how to choose the key words of the paper. I hope it helps you. If you want to know more, please visit this platform in time!