What do you mean by literature search?

Question 1: What is the meaning of literature retrieval? Literature Retrieval (Information Retrieval), refers to the organization and storage of information in a certain way, and according to the needs of information users to find out about the information process, which is broadly defined information retrieval. Information Retrieval in a narrow sense refers only to the second half of the process, that is, from the information *** to find out the information needed in the process, equivalent to what people usually say that the information search (Information Search).

Literature retrieval is divided into data retrieval: a search for data in the literature as the object. Such as a formula, a chemical molecular formula. Facts search: the facts in the literature as the object, retrieve the time, place or process of a certain thing Literature search: the object of the literature to find a topic of the relevant literature of a search.

With the search mark compared with the storage mark of the literature, if you can achieve consistency, it is called a match, you can get the hit literature.

Question 2: literature retrieval techniques include which kinds of 1. Boolean logic retrieval

The use of Boolean logic operators for the retrieval of the word or code logical grouping, is the most commonly used in modern information retrieval systems, a technology. Commonly used Boolean logic operator there are three, respectively, logical or "OR", logical and "AND", logical not "NOT".

2. intercepted word search

Intercepted word search is a very common technology used in computer retrieval systems. Due to the word characteristics of the Western language, often encountered in the search of the singular and plural form of the noun is inconsistent; the same meaning of the word, the British and American spelling is inconsistent; the word stem plus a different nature of the prefixes and suffixes can be derived from a number of words of similar significance, and so on. This is to be used to intercept the word search

3. location search

Location search is also called full-text search, neighborhood search. The so-called full-text search, is the use of natural language in the record for retrieval, the logical relationship between words and words with the position of the operator grouping, the relative position of the search terms between the restrictions. This is a technical method that can be used to retrieve free words directly without relying on subject lists.

4. Field-qualified search

Field-qualified search refers to a search method that limits the search term to one or several fields in the database record. In the retrieval system, the database is set up to search the fields are usually two kinds: the expression of the content of the subject of the literature features the basic fields and the expression of the external features of the literature of the auxiliary fields.

5. Weighted search

Weighted search is a quantitative search technique provided in some retrieval systems. Weighted search with Boolean search, word search, etc., is also a basic means of literature retrieval, but different from them is that the focus of the weighted search does not lie in the determination of the search term or string is not in the database, and other search terms or strings what is the relationship between the search terms or strings, but rather in the determination of the search term or string in the retrieval of the logic to meet the degree of impact on the hit or miss.

6. Clustering

Clustering is not categorized things, in the case of not knowing how many categories should be divided into, according to the things that are different from each other's intrinsic attributes, similar attributes of the information will be divided into the same category below.

Question 3: What kind of class is Literature Retrieval Literature Retrieval is a tool course that focuses on the tools, methods, and resources for retrieval. Each issuer will have its own characteristics, some focus on paper-based literature retrieval, some focus on electronic literature retrieval. The main use of this class is to help you find resources effectively. For example, if you want to know about an individual and you need to read some biographies of that person, the search will tell you what biographies are available about that person and how to use them, which can be very targeted to increase your productivity. Therefore, I think you should sink your teeth into this course.

Question 4: What is the meaning of literature retrieval Literature Retrieval (Information Retrieval), that is, the information will be organized and stored in a certain way, and according to the needs of the information user to find out about the information process, so it is also known as the full name of the "information storage and retrieval (Information Storage and Retrieval). Storage and Retrieval (Information Storage and Retrieval), which is a broad information retrieval.

In a narrower sense, information retrieval refers only to the second half of the process, i.e., the process of finding out the information needed from the letter II ***, which is equivalent to what people usually call Information Search.

Question 5: What is literature information retrieval? Literature information retrieval has a broad and narrow two meanings. Literature information retrieval in a broad sense, including the storage of literature and information to find two winking process. Literature information storage is the collection of literature information, citation and recording, and to be organized in an orderly manner, compiled into the process of literature information retrieval system. Literature information to find from a large amount of literature information to find out the user needs specific information process, that is, to express the user's information needs of the question characteristics, and the retrieval system in the identification of comparison, in order to find out from the consistent information. With the development of computer technology, literature information retrieval from manual retrieval into the computerized stage, and is to the information processing automation and retrieval of all-culture, intelligent, network direction, its retrieval content, application areas and popularization scope is also rapidly expanding. Due to the user's diverse information needs, information retrieval technology is also constantly developing and changing, which in turn produces a variety of types of information retrieval. According to the retrieval object can be distinguished as data retrieval, fact retrieval and literature retrieval; according to the retrieval method can be distinguished as manual information retrieval and computerized information retrieval; according to the retrieval requirements can be distinguished as strong correlation retrieval and weak correlation retrieval; according to the nature of the retrieval can be distinguished as the fixed topic retrieval and retrieval of the backtracking; according to the retrieval of the information in the form of the distinction between the text retrieval and multimedia retrieval.

Question 6: What is the meaning of the literature search fee? In similar to Baidu, Google these searches in the search of the general problem is not charged search fees, but if the search for some specialized knowledge, or business sold to the search engine, then we have to charge, in China Knowledge Network, Wanfang database these searches such as professional papers, journals are generally required to search fees, not free service? That said, people buy back a foreign class of advanced literature, for your service, of course, charges la ~ ~ but the cost is generally not equal ~ ~ that depends on what you search for

Problem 7: What is the standard number of the literature search literature types, such as books, journals, dissertations, patents, conference literature, standard literature, technical archives, and so on, one of which is the standard literature, whether international or national standards have a standard number, the standard number is the standard number, the standard number is the standard number. One of them is standard literature, whether it is international standards or national standards have standard number, for example, GB/T 7714-2005 "Rules for the Recording of Post-textual References", is a national recommended standard, "GB/T 7714-2005" is the standard number. Utilizing the standard number to search standard literature is a good way to search.

Question 8: What is the purpose of learning literature retrieval Query information