Information retrieval refers to the process of organizing and storing information in a certain way and finding out relevant information according to the needs of information users. So its full name is also called information storage and retrieval, which is information retrieval in a broad sense. Narrow information retrieval only refers to the second half of the process, that is, the process of finding the required information from the information set by means of retrieval tools according to the needs of the subject, which is equivalent to what people call information search. The process of information retrieval often needs a method of evaluation and feedback, and many comparisons and matches are made to obtain the final retrieval results.

2

When you get a book, you will see "ISBN" (international standard book) on the back cover or copyright page.

Number) and 10 digits in ISBN 7-5004- 1693-

8/I 200, which means: ISBN group number-publisher number-book name-inspection number/book.

Classification number and species number. The group number represents the number of a region or geographical area, country or group.

China's number is "7"; The publisher number represents the number of the publisher; The title of this book is published by a publishing house.

The name of the specific publication; Check whether the book number is legal. China joined.

After the ISBN system, the corresponding national standard-China Standard Book Number (ISBN) was formulated and published in 1987 65438+ 10.

Implement.

What's the use of such a complicated combination of codes and numbers? First, help you understand books.

Publication scale. ISBN consists of ten digits, in which the inspection number is constant at one digit, and the group number is desirable.

1-5 digits. If the group number of a country or region is five digits, including publisher number and book title.

The sum of numbers and numbers is four digits. By arranging and combining, this country or region has the largest number of publications.

Just ten thousand kinds; If the group number is one digit, it is the sum of the publication number and the number of digits of the title.

It is eight digits, and its publishing volume will be as high as 100 million kinds. The larger the digit, the smaller the publishing volume.

The smaller the number of digits, the greater the number of publications. China's group number is "7", which shows its large publishing volume.

Second, help you understand the publishing house. First of all, we can understand the publishing scale and current situation of the publishing house.

Number of books published. The sum of ISBN's publisher number and the number of digits of the book title is always equal to 8. at present

China's publishing houses can use 2 to 5 digits. If the publisher number is three, the title is five.

Number of digits, published volume100000. The smaller the number of publishers, the greater the number of titles.

The more you publish, the less you publish. For example, The Commercial Press1996 was published in July.

The third edition of Modern Chinese Dictionary has been revised, and the Chinese standard book number is ISBN 7- 100-0 1777.

-7/H.519. "100" is the code of the Commercial Press, and "0 1777" is the title of the book, which means

Business can publish 654.38+ten thousand kinds of books. By July, 1996, there were 1778 kinds of books (published by publishing house).

The title of the first book starts from 0). In addition, it can be understood that publishers are comprehensive and also

The title and classification number of its professional ISBN respectively represent how many books can be published.

How many kinds have been published and how many kinds have been published in a certain category. For example, People's Literature Publishing House.

The ISBN of China is ISBN 7-02-000420-2/i.42 1.

Its title is equal to the species number, indicating that People's Literature Publishing House is a professional publishing house, and its basis is

Mainly publishes literary books.

Third, it is convenient for library staff. Because ISBN is unique in the world, it is universal.

The accuracy of ISBN retrieval is higher than that of title retrieval. The title of the book has the phenomenon of duplicate names,

For example, Mao Dun has the novel Rainbow, and Lawrence of England also has the novel Rainbow. through

The retrieval through ISBN is unique, and the retrieval speed is faster than that through book title. book

Names range from a few words to more than a dozen words, while ISBN has only ten Arabic numerals, which is a general work.

All the staff can input it, and the speed is much faster than the speed of inputting the title.

In a word, the biggest feature of Chinese standard book number is to combine the international standard book number with the whole country.

The combination of classification number and species number in the unified book number is simple in structure, strong in hierarchy and convenient to use.

Computer processing and retrieval, to publishing, distribution, ordering, statistics, cataloging, etc.

Convenience is an important retrieval point for readers to obtain books in the library.

three

Construction of Computer Cable Detection System

Computer retrieval system consists of computer hardware, software, database and communication network.

I. Computer hardware

Computer hardware is the general name of all kinds of hardware devices used in the system, mainly including host, peripheral devices and other devices with certain performance related to data processing or data transmission.

Second, software.

The software consists of system maintenance software and retrieval software. System maintenance software, such as database management program and thesaurus management program, is used to ensure the efficient operation of the retrieval system. Retrieval software is the interface between users and systems. Users search through retrieval software, and the function of retrieval software directly affects the retrieval effect. Retrieval software can be divided into instructions, menus and intelligent interfaces.

Third, the database

According to the ISO/DIS 5 127 standard, data is defined as "a data set consisting of at least one document and meeting the requirements of a specific purpose or a specific data processing system." Generally speaking, a database is a collection of interrelated data stored in some way on a computer storage device.

According to the international classification method, the database can be divided into the following types:

1. Reference database

A reference database is a database that guides users to another information source to obtain the original text or other details. It includes bibliographic database and catalogue database.

Bibliographic database refers to a kind of database that stores secondary literature in a certain field (such as abstracts, titles, catalogues and other bibliographic data), sometimes called secondary literature database, or literature database for short. For example, China Mechanical Engineering Abstracts Database belongs to this type of database.

Guide database, also known as indicative database, refers to a kind of database that stores brief descriptions of some institutions, people, publications, projects, plans, activities and other objects, and guides users to obtain more detailed information from other relevant information sources. Such as product catalog, organization catalog, research and development projects, fund projects and other databases all belong to this type.

2. Source database

Source database refers to a database that can directly provide original data or specific data, and users do not need to refer to other information sources. It can be divided into:

(1) numerical database This is a source database that provides data in numerical form, such as statistical database and financial database.

(2) Text-numerical database This is a source database that can provide both text information and numerical data, such as enterprise information database and product database.

(3) Full-text database This is the source database for storing the full text of literature or its main parts, such as the full-text database of laws and regulations and the full-text database of periodicals.

(4) Terminology Database This is a kind of source database that specially stores terminology information, word information and the results of terminology work and language standardization work, such as terminology information database and various electronic dictionaries.

(5) Image Database This is a source database for storing various images or graphic information and related text description materials. It is mainly used for computer storage and retrieval of data types such as architecture, design, advertisements, products, pictures or photographs.

In addition to the above-mentioned types of databases, there are also databases that can store many different types of data at the same time, that is, hybrid databases. In addition, according to different carriers, it can also be divided into magnetic media database, optical disk database and multimedia database.

Fourth, the communication network.

Due to the development of modern communication technology, public data transmission technology provides a guarantee for information transmission, and information retrieval gradually develops into network retrieval, which connects computers through data transmission networks. Each computer becomes a node in the network, each node can contain one or more databases, and each node and its terminal on the network can access the databases in the network as long as they are authorized to realize resource sharing. With the development of space technology, information retrieval has entered a new stage of information transmission, satellite communication and computer technology.

four

There are 22 categories in China Library Classification: A Marxism-Leninism, Mao Zedong Thought, Deng Xiaoping Theory, B philosophy, religion, C social science, D politics, law, E military, F economy, G culture, science, education, sports, H language, writing, I literature, J art, K history, geography, N natural science and O number. Q bioscience, r medicine, health, s agricultural science, t industrial technology, u transportation, v aviation, aerospace, x environmental science, safety science, z comprehensive books.

For detailed categories, please refer to China Library Classification on the library homepage.

Physical education includes culture, science, education and physical education.

five

1. Does it support full-text retrieval?

2. How to sort the retrieval results, relevance, time, etc. Is it comprehensive?

3. Whether the retrieval functions are comprehensive, such as Boolean logic retrieval, keyword retrieval, location retrieval, cut-off retrieval, restricted retrieval, etc.

4. How about query speed and maintenance update?

5. Is the interface easy to use? Does it work?

I suggest you find a book about information retrieval to read. What I said is very simple. There are no books at hand. If you want to see it in detail, you have to see it. The information retrieval of NPC Press is very good.

six

According to the relevant information of the literature, find the corresponding collection catalogue or joint catalogue, find the collection unit, and then ask for or copy the original text. If the library of this unit does not collect the required documents, users can obtain them through interlibrary loan or document delivery service.

seven

Of course, the National Library is the most authoritative academic library, and all university libraries have corresponding academic resources. We can query the collections and information services of important universities through China University Document Guarantee System (Calis).