The most commonly used methods of periodical grouping are: subject category, periodical name, research funding, research level, literature author, author unit, Chinese keywords, publication year, and no grouping.

The order is: publication time, relevance, cited frequency, download frequency, * * *.

CNKI HowNet, the concept of national knowledge infrastructure, was put forward by the World Bank in 1998. CNKI project is an information construction project aimed at realizing the dissemination, enjoyment and value-added utilization of knowledge resources in the whole society. Initiated by Tsinghua University and Tsinghua Tongfang, it was established in June 1999.

Extended data

China HowNet has developed into an international advanced online publishing platform integrating periodicals, doctoral dissertations, master's dissertations, conference papers, newspapers, reference books, yearbooks, patents, standards, Chinese studies and overseas literature resources through cooperation with periodicals, publishing circles and various content providers. The website of the Center is updated with more than 50,000 documents every day.

Provide CNKI source database, foreign language database, industrial database, agricultural database, medical database, economic database and educational database.

Among them, the comprehensive databases include China periodical full-text database, China doctoral thesis database, China excellent master thesis full-text database, China important newspapers full-text database and China important conference literary theory full-text database. Each database provides three retrieval functions: primary retrieval, advanced retrieval and professional retrieval. Advanced retrieval function is the most commonly used.

Baidu Encyclopedia-China HowNet