In essence, the advanced retrieval of HowNet involves the AND, OR NAND of Boolean logic.
In document retrieval, AND, OR and NOT of Boolean logic are commonly used logical operators.
In a word, we can combine "yes, or yes, or no" with "yes, or yes, no".
Step 2 include
"Parallelism" in HowNet's advanced retrieval refers to "AND" of Boolean logic, with A and B as retrieval keywords. We need to use "parallel" to retrieve the shadow relationship between A and B (the blue part), and the retrieved result refers to the document where keyword A and keyword B*** appear at the same time.
If "* * * enjoys economy" and "application" are included, the retrieved documents are related to "* * * enjoys economy" and "application".
Word frequency refers to the frequency with which keywords appear.
Accurate retrieval means that the word order and the interval between words in the search results are exactly the same.
Fuzzy retrieval means that the input search words only appear in the search results, and the word order and the interval between words can be changed.
3. Or contain
The "or inclusion" of HowNet advanced retrieval refers to the "or" of Boolean logic, and A and B are retrieval keywords. We can use "or contains" to retrieve any related documents of A and B (such as the blue shaded part), and the retrieved results refer to the documents where keywords A and B have appeared.
If you search for "* * enjoy the economy" or "* * enjoy the bike", the retrieved literature will be related to "* * enjoy the economy" or "* * enjoy the bike".
If you want to find literature with two keywords, you can use "or contain" directly.
4. Not included
The exclusion of HowNet's advanced retrieval refers to the negation of Boolean logic, and keywords A and B are retrieval keywords. We need to use "exclusion" to retrieve documents with a but no b (such as the blue shaded part), and the retrieved results refer to documents related to keyword A but without keyword B.
Search "* * enjoys the economy" and exclude "* * enjoys the bike". The retrieved literature will be related to "* * enjoys the economy", but does not include "* * enjoys the bike".
In this way, readers can refine their own literature resources through such logical collocation retrieval.
In advanced retrieval, the input content retrieval conditions can be selected as subject, article title, keywords, abstract, full text, references, Chinese library classification number, etc. to match the logical relationship of "containing, containing or not containing", which can accurately retrieve documents and is also applicable to other databases.
Step 4 search for tips
0 1. retrieval method
Retrieval: Just enter the search word you are looking for, you can find out the retrieval method of related documents, which is an effective way to obtain documents quickly.
Advanced search: it provides a more flexible and convenient way to construct search types, freely combines logical relationships, and can add up to 7 lines to help readers achieve accurate search.
Professional retrieval: refers to the document retrieval method that uses logical operators and keywords to help professionals carry out scientific and technological novelty retrieval.
Author's post search: through the name and unit information of scholars, you can find all the documents published by scholars and their cited downloads.
Sentence retrieval: Find a sentence containing two words through two keywords input by readers, and realize fact retrieval.
One-box search: unified search, all kinds of resources, periodicals, papers, conferences, newspapers, yearbooks, patents and achievements.
02. Search results
Grouping by subject category: locate the literature of this subject directly from the massive literature, so that the literature reading can closely focus on the theme.
Grouped by funds: readers can know how much the country has invested in scientific research in this field; Scientific researchers can apply for projects; National scientific research managers can also quantitatively analyze, evaluate and track the effect of a fund supporting scientific research.
Grouped by research levels: readers can find relevant national policy research, engineering technology application achievements, industry technical guidance, etc. Through grouping, we can realize the overall understanding of the whole subject field.
Grouping by author/institution: it is also an important means to help readers find authoritative experts/research institutions and track the achievements of important personnel/research institutions.
Sorting by topic: the degree of correlation between the result document and the search word input by the reader, the greater the correlation, the higher the ranking, and the reader can find the document whose content is most relevant to the search word through correlation sorting.
Sorting by publication time: it can help readers evaluate old and new documents, find the latest documents, find the earliest published documents in the library, realize academic tracking and conduct systematic research on documents.
Sorting by citation: Sort by citation times to help readers choose good literature and publications recognized by academic peers.
Sort by download: The most frequently downloaded documents are often the most widely spread, popular and valuable documents.
03. Export document format
The paper has certain requirements for the format of references. If there are too many references, it will take a lot of time to type them one by one according to the format.
Export/reference technology can solve this problem.