1, direct method, also known as common law, refers to the method of directly using retrieval system to retrieve literature information. It is also divided into sequential investigation, reverse investigation and spot check. Sequential retrieval method refers to the method of using retrieval system to retrieve literature information from far to near in time sequence. Reverse retrieval method is a method of literature retrieval by using retrieval tools from near to far, from new to old, and in reverse time sequence.
This law focuses on recent literature. Using this method, you can get the latest information as soon as possible. Spot check method refers to the characteristics of the project, selects the most likely or most likely time period of document information related to the project, and uses retrieval tools to carry out key retrieval.
2. Traceability refers to the method of tracing the original texts one by one by using the references listed at the back of the documents without using the general retrieval system, and then expanding the scope of the literature information one by one from the list of references listed at the back of these original texts. It can snowball and get better retrieval results according to the citation relationship between documents.
3. Circular method: also known as subsection method or comprehensive method. It uses direct method and backtracking method alternately in stages to learn from each other's strong points and cooperate with each other to obtain better retrieval results.
4. Author approach: Many retrieval systems have author index and institution index, and patent literature retrieval systems have patentee index. Using these indexes to search from the names of authors, editors, translators, patentees or the names of institutions and groups in turn is called author mode.
5. According to the reference relationship between documents, better retrieval results can be obtained. Circular method is also called subsection method or synthesis method. It uses direct method and backtracking method alternately in stages to learn from each other's strong points and cooperate with each other to obtain better retrieval results.
6. Literature retrieval approaches include author approach: many retrieval systems have author index and institution index, and patent literature retrieval systems have patentee index. Using these indexes to search from the names of Liang and his authors, editors, translators, patentees or the names of institutions and groups is collectively called the author mode.