What is the reason for too many Chinese results in the literature search process?

1. Use too many truncation methods;

2. Logic should be used.

of the use of logic or.

The selection of search terms directly affects the search effect. A search term is a document feature identifier in a document record, which can be a subject heading, free word, etc., which reflects the characteristics of the content of the document. It can also be the author, title, etc., which reflect the appearance characteristics of the document.

There are two scenarios. One is that the things you want to retrieve have multiple meanings, and he will list them for you one by one, so there are many results. The second is that if you want to search for something with pinyin, there are multiple results, or if you search inaccurately enough, there are multiple possibilities, and there will be many results.

That depends.

Classification search, journal name navigation, primary search, advanced search, professional search application these five kinds can increase the amount of information detected, the database provides 15 index fields, select the field to be retrieved in the drop-down list box of the selection field during the search, in the advanced search, you can choose 1-6 Hu missing search terms at a time to search, the content of the search dialog box should be filled in turn, otherwise it will not be retrieved, when entering multiple search terms, you need to select a logical operator, and the logical operator provided by the system includes "and, does not contain, or".

1. First of all, understand the scope of the database, the type of literature, the language and the key areas of the database.

2. Try to make the search formula as simple as possible, generally search for the most basic concepts first, and then limit the basic concepts, and gradually narrow the search scope until the satisfactory literature is detected. Avoid using words with a wide range and long phrases.

3. Avoid using words with no practical meaning, such as of, the, or, from, etc.; Be careful with the use of truncations.

4. If the literature cannot be retrieved with a subject heading, try the search for sub-subject headings or other related words in the database thesaurus.

5. After doing a search, regardless of whether the search query is long or short, press the "clear" key to clear the search query before proceeding to the next search.

Also known as the general law, it refers to the method of directly using the retrieval system (tool) to retrieve literature information. It is divided into inspection methods, inspection methods and spot check methods.

Circumvention of inspection methods: The direct reputation retrieval method refers to the use of a retrieval system to search for literature information in chronological order from far to near.

method. This method can collect systematic literature on a certain topic, which is suitable for literature retrieval of larger topics.

For example, given the age of a topic and the whole process of its development, we can use the shuntlookup method to start from the initial age.

The test method of pouring school virtuality: reverse retrieval is a literature retrieval method from near to far, from new to old, and contrary to the chronological order. With this method, you can get the most up-to-date information as quickly as possible.

Sampling: Spot checking is a method of selecting the time period during which the literature information related to the project is most likely or most likely to appear, and using search tools to conduct key searches. The development of the concept of literature goes through three stages:

It was first found in the Analects

In Bajing, Zhu Xi in the Song Dynasty.

The interpretation is: literature refers to ancient books and literature, and refers to people who know history and have wisdom. Modern scholars believe that literature is a carrier of human knowledge and information. It is composed of four elements: file content, carrier material, information symbol and dust ignition recording method.

In a database search, when the number of documents checked out is low, it may be due to the following reasons:

misspelling of search terms; omission of important synonyms or implied concepts; The search terms are too vague and specific; No truncation operators are used.

Database search refers to the retrieval of information contained in electronic literature, data, facts, images, sounds, etc.

When searching the database, if the number of documents checked out is small, the solutions are:

1.Select all synonyms and related words, and use logic to clarify or connect.

2.Reduce the number of logical and computational operations.

3.Cancel or relax some search restrictions, such as age and language.

4.Use truncated searches.

5.Select the full-text field.

6.Adjust the position operator from strict to loose.

7.Changed exact search to fuzzy search.

Reason: Classification search, journal name navigation, primary search, advanced search, professional search application these five kinds can increase the amount of information detected, the database provides 15 index fields, select the field to be retrieved in the drop-down list box of the selected field when searching.

There are three parts to the input:

The second is the evaluation of the importance of local knowledge sources acquired through intentional understanding.

Three is a constant that represents the user's preference. When training this neural network, the final evaluation result is labeled by manual annotation or user feedback.

If a search task involves different data sources, such as where a patient wants to search for a doctor, it involves hospital information, doctor information, transportation information, etc. Therefore, the evaluation of the results involves the fusion of multiple scenarios, and it is necessary to use the square circle method of neural network to evaluate. The neural network consists of an input layer, multiple hidden layers, a sail cavity, and an output layer.

Reason: 1. Classification search, journal name navigation, primary search, advanced search, professional search application can increase the amount of information detected, the database provides 15 index fields, and the field to be retrieved is selected in the drop-down list box of the selected field when searching.

2. In the advanced search, you can select 1-6 search terms for retrieval at a time, and the content of the search dialog box should be filled in turn, otherwise it will not be retrieved, when entering multiple search terms, you need to select a logical operator, and the logical operator provided by the system includes "and, does not contain, or".

In several forms of literature search, the results of (c. literature) search only provide clues to the literature rather than the literature itself.

a. Data. b. Facts.

c. Literature. d. Intelligent.

What are the types of literature searches:

A literature search is a process of finding literature. Literature retrieval is the whole process of searching for literature information that meets specific needs from a large number of literature groups. In this sense, a literature search is also an information search.

There are three different types of searches based on the objects they are looking for:

1. Bibliographic retrieval is a kind of retrieval with retrieval tools (bibliography, index, abstract, bibliography) as the search object. Any search process for searching for literature related to a certain topic (era, region, author, language, etc.) is a bibliographic search. For example, "What are the literature on the investment environment of Shantou Special Economic Zone?"

The search results are bibliographic records, including bibliographic data records such as the title of the treatise, the author, and the source of the document.

2) Fact retrieval, which is based on facts and requires the search of certain basic facts in the literature. For example, "How much did Mr. Li Ka-shing invest in the Shantou First City and Housing Project?" Was he present at the signing ceremony?

This requires not only the identification of the information that records these facts, but also the analysis and comparison of them in order to be sure. Therefore, fact retrieval, also translated as matter retrieval, falls under the category of data retrieval.

3) Data retrieval, which is to take data as the search object and require the special data contained in the literature, including statistical data, calculation formulas, charts, physical property data, chemical substance data, etc. For example, "in 1994, how much was the import and export value of Shantou Port?" The results are highly condensed and directly usable data.