The paper duplicate checking mechanism of China Knowledge Network is mainly to compare the papers to be tested with the existing literature resources through comparative testing, so as to judge whether there are academic misconduct such as plagiarism. Specifically, the paper duplicate checking mechanism of China Knowledge Network mainly includes the following aspects:

1. Text similarity calculation: through computer algorithm, calculate the similarity between the paper to be detected and the text in the existing literature resources, and get the similarity between the two articles. Commonly used similarity calculation methods are cosine similarity and Jaccard similarity.

2. Keyword matching: On the basis of calculating the text similarity, further analyze the keywords in the article, such as nouns and verbs, to judge whether the theme and content of the article are similar.

3. Semantic analysis: By analyzing the semantic structure of the article, we can judge whether the logical structure and the way of discussion of the article are similar. This helps to identify articles that are essentially plagiarized, although the words are different.

4. Citation detection: For published papers, China Knowledge Network will detect the cited documents to ensure that the contents cited in the papers do not copy the achievements of others.

5. Duplicate check report: After the duplicate check of the paper is completed, the system will generate a duplicate check report, listing in detail the parts of the paper similar to other documents and the specific values of similarity. This helps the author to understand the originality of his paper and revise it when necessary.

In a word, the duplicate checking mechanism of China Knowledge Network comprehensively and accurately judges the originality and academic misconduct of papers through various technical means, providing a fair and just academic environment for the academic community.