2.WWW is the abbreviation of World Wide Web, which can be translated as "World Wide Web" or "World Wide Web". It is a user-friendly information service based on the Internet, which is used to retrieve and read related contents of servers connected to the Internet. Using hypertext, hypermedia and other technologies, this service allows users to retrieve text, graphics, sound and video files on remote computers through browsers such as Microsoft IE and Netscape.
3. Intercepted word retrieval: refers to the retrieval of a part of the intercepted word, and considers that the document that meets all the characters (strings) of this part is a hit document. According to the location of truncation, there are three types of truncation: post-truncation, pre-truncation and mid-truncation.
4. Hypertext: An example of a user interface used to display text and text-related content. At present, hypertext generally exists in the form of electronic documents, in which the text contains hypertext links that can be linked to other fields or documents, allowing direct switching from the current reading position to the text pointed by the hypertext links.
Hypertext has many formats, among which HTML (Hypertext Markup Language) and RTF (Rich Text Format) are the most commonly used. The web pages we browse every day belong to hypertext.
5. Content-based image retrieval technology: search according to images, content semantics and context relations of images, and detect other images with similar characteristics from the image database with image semantic features as clues. Because the scale of images is generally larger than pure text information, content-based image retrieval requires higher retrieval speed and efficiency. At present, there are many content-based image retrieval systems applied in practical environments, such as the earliest commercial QBIC system developed by IBM, WebSeek system developed by Columbia University and Photobook system developed by MIT. To retrieve Web images through content-based technology, it is necessary to separate the images from the Web to form an image set, and to conduct content-based feature analysis and similarity matching for each object in the image set. Content-based image retrieval system generally includes image processing module, query module, object library, feature library and knowledge base.
6. Knowledge discovery is an extraordinary process to identify effective, novel, potentially useful and ultimately understandable patterns from data sets. Knowledge discovery transforms information into knowledge, and discovering gold nuggets of knowledge from data mining will contribute to knowledge innovation and the development of knowledge economy.
7. search engine: English is search engine, which is a system that sorts, classifies and stores Internet information resources in a network database for users to query, including information collection, information classification and user query. At present, there are two popular search engines: classified directory search engine and keyword full-text search engine.
8. Weighted retrieval: It is a quantitative retrieval technology provided by some retrieval systems. Weighted retrieval, like Boolean retrieval and truncated retrieval, is also a basic retrieval method of literature retrieval, but different from them, the focus of weighted retrieval is not to determine whether the retrieval word or string exists in the database and what is the relationship with other retrieval words or strings, but to determine the degree of influence of the retrieval word or string on whether the literature hits after satisfying the retrieval logic. The basic method of weighted retrieval is to give a numerical value after each question word to indicate its importance, which is called weight. When searching, first find out whether these search words exist in the database records, and then calculate the sum of the weights of the existing search words. When the sum of the weights reaches or exceeds a given threshold, the record is a hit record.
9. Retrieval based on speech recognition technology: Digital audio is managed as an opaque bit stream, and audio retrieval is based on attributes and descriptions entered manually.
10, hypermedia: = hypertext+multimedia. Hypermedia is essentially the same as hypertext, except that hypertext technology is called hypertext because it manages pure text in the early days of its birth. With the rise and development of multimedia technology, the management object of hypertext technology has expanded from pure text to multimedia. In order to emphasize the change of management objects, the word hypermedia came into being.