The influence of computer information retrieval on life and study

In order to make full use of these vast literature information resources, we must use various retrieval tools. At the same time, the proliferation of Internet information resources and its heterogeneity and dynamics constantly bring new challenges to information retrieval. Information retrieval has become the key to the informationization and various applications of modern society. How to simulate and apply the intelligent principle of human brain at a higher level and fundamentally change the retrieval mode of information resources has become a hot topic in the research of modern information knowledge retrieval theory. Practice has proved that it is a successful experience to combine artificial intelligence technology with information technology and give full play to the role of artificial intelligence. The relationship and development of knowledge retrieval and information retrieval are discussed below. 1. Boolean retrieval is the most commonly used method in modern information retrieval system, which uses Boolean logic operators to logically combine search words or codes. There are three commonly used Boolean logic operators, namely logical OR, logical AND and logical NOT. Using these logical operators, the retrieval phrases are matched into query expressions, and the computer will match the query expressions with the records in the system. When they are consistent, they will hit and automatically output the document record. The following two words "computer" and "document retrieval" are used to explain the meaning of the three logical operators. ① "Computer" and "document retrieval" refer to the documents whose search contents contain both the words "computer" and "document retrieval". ② "Computer" or "document retrieval" refers to searching for documents containing "computer" or "document retrieval" or both. ③ "Computer" rather than "document retrieval" refers to finding the part of the document that contains "computer" but does not contain "document retrieval". Logical operator is the most frequently used in retrieval, and the skill of using logical operator determines the satisfaction of retrieval results. To express retrieval requirements with Boolean logic, we should not only grasp the relevant factors of retrieval theme, but also pay attention to the influence of Boolean operators on retrieval results. In addition, for the same Boolean logic problem, different operation sequences will have different retrieval results. There are many things where Boolean operators are used correctly, but the expected retrieval results cannot be achieved. Second, information retrieval information retrieval originated from the library's reference service and abstract indexing, which first developed in the second half of 19 century. By the 1940s, indexing and retrieval had become an independent tool and user service project of the library. Information retrieval usually refers to text information retrieval, including information storage, organization, presentation, query and access, and its core is text information indexing and retrieval. It is based on information organization forms, such as character strings and structured databases, and uses information processing methods, such as sorting data search and character matching, to achieve inefficient retrieval. Information retrieval comprehensively applies Boolean retrieval method and hyperlink-based retrieval technology, which improves the basic retrieval function, but the disadvantage is that it can not give accurate answers to accurate questions. Historically, information retrieval has experienced many stages of development, such as manual retrieval, computer retrieval, networking and intelligent retrieval. At present, information retrieval has developed to the stage of networking and intelligence. The object of information retrieval has expanded from the relatively closed, stable and consistent information content managed by independent databases to the open, dynamic, rapidly updated, widely distributed and loosely managed Web content. The users of information retrieval have also expanded from the initial information professionals to the general public, including business people, managers, teachers and students, professionals and so on. They put forward higher and more diversified requirements for information retrieval from results to methods. Adapting to the needs of networking, intelligence and personalization is a new trend in the development of information retrieval technology. Third, knowledge retrieval The basic idea of knowledge retrieval is to simulate and expand human intelligent behavior and cognitive thinking methods about knowledge processing and utilization, and it is a favorable tool to make full use of the literature information resources of online libraries and digital libraries. For example, abstract thinking method and image thinking method. Knowledge retrieval has obvious advantages: ① to realize the transformation from information service to knowledge service, to provide users with potential content knowledge, and to analyze and predict advanced field achievements or knowledge. (2) Provide active service mode, automatically optimize users' needs, and actively provide personalized retrieval. ③ User-oriented, flexibly choose ideal retrieval strategies and technologies according to users' needs and changes, and transfer heavy knowledge and information acquisition work from users to computers. ④ Comprehensive application of all kinds of knowledge and efficient intelligent technology to improve retrieval efficiency. Knowledge retrieval is a comprehensive application of advanced theories and technologies in information management science, artificial intelligence, cognitive science, linguistics and other disciplines. Based on knowledge and knowledge organization, it integrates knowledge processing and multimedia information processing, fully expresses and optimizes users' needs, can efficiently access knowledge sources of all media types, and accurately select the results that users need. Fourth, intelligent retrieval Intelligent retrieval uses word segmentation dictionary, synonym dictionary and homophone dictionary to improve the retrieval effect. For example, users can also retrieve information related to "computer" when they query "computer"; Further, it can assist the query of knowledge level or concept level, form a knowledge system or concept network through subject dictionary, upper and lower dictionaries and related dictionaries, give users intelligent knowledge tips, and finally help users get the best retrieval effect. For example, users can further narrow the query scope to "microcomputer" and "server" or expand the query scope to "information technology" or related "electronic technology", "software" and "computer application". In addition, intelligent retrieval also includes ambiguous information and retrieval processing, such as whether "Apple" refers to fruit or computer brand. The distinction between "China people" and "China people" will be processed by combining ambiguous knowledge description database, full-text indexing, user retrieval context analysis and user-related feedback, so as to efficiently and accurately feed back the most needed information to users. V. Computer Information Retrieval With the advent of the world's first electronic computer in 1946, computer technology gradually entered the field of information retrieval and was closely combined with information retrieval theory; Off-line batch information retrieval system and online real-time eye newspaper retrieval system have been successfully developed and commercialized. From 1960s to 1980s, with the promotion of information processing technology, communication technology, computer and database technology, information retrieval developed rapidly in the fields of education, military and commerce, and was widely used. DiMog international online information retrieval system is the representative of information retrieval field in this period, and it is still one of the most famous systems in the world. In monolingual retrieval, computer retrieval system uses web spiders to collect network information, and then uses automatic indexing technology to index the collected information to form an index information base. After the user inputs the retrieval formula, the computer matches the retrieval formula with the index items in the database, and outputs the retrieval results in descending order according to the correlation between the index formula and the index items. In cross-language retrieval, as long as language processing technology is added in the retrieval process, one language can correspond to other languages. Information retrieval is an important part of economic life and scientific research. Especially in today's rapidly developing information age, how to obtain valuable information widely, quickly and accurately, especially how to obtain valuable information through electronic and network means, directly affects the success or failure of teaching and scientific research. Therefore, the methods and skills of information retrieval are increasingly becoming the basic skills necessary for modern scientific and technological workers and teachers. At present, computer information retrieval has become the main way for users to obtain information, and presents a multi-dimensional information retrieval pattern of online information retrieval, CD-ROM information retrieval and Internet information retrieval. How to retrieve the required information quickly, accurately and effectively has become an increasingly prominent problem, so understanding the characteristics of each information retrieval system is the most basic prerequisite for implementing information retrieval. Here are three kinds of computer information retrieval systems. 1. Online information retrieval system. The so-called online information retrieval refers to the whole process of information users using terminal equipment to have direct man-machine dialogue with information retrieval systems all over the world through the international communication network and find out the information needed by users from the database of the retrieval system. An online information retrieval system usually consists of retrieval service agencies, international communication networks and terminals. 2. CD-ROM information retrieval system. CD-ROM information retrieval system is a stand-alone information retrieval system, which solves the shortcoming of low data storage in stand-alone information retrieval system and is a widely used computer information retrieval system at present. CD-ROM is mainly used in the field of information retrieval. 3. Internet information retrieval. As a computer network with the largest number of users and the greatest influence, the Internet can be called the information database and document database with the richest resources in the world, which can meet almost any information demand on a global scale. Internet information retrieval system generally consists of computer server, communication network and communication protocol. Network information retrieval server, user terminal, etc. Network information retrieval of intransitive verbs is simply information retrieval under the network environment. It is very different from the traditional information retrieval, and the network information retrieval has diversity and flexibility, which is incomparable to the traditional information retrieval. Now almost all the information obtained by traditional methods can be retrieved through the network, and it is faster, newer and more accurate. With the rapid development of computer, multimedia and modern communication technology, school libraries, which mainly focus on printed documents, have begun to transform into digital libraries, which mainly focus on electronic information and virtual information. Internet has created rich and diverse learning resources and realized resource sharing. With the birth and further promotion of learning socialization and lifelong learning system, the application of network in primary and secondary education is increasingly extensive and in-depth. Internet has brought us rich information resources of comprehensive education in schools, and provided information that can be used in the process of comprehensive education in schools and spread in the school education system. In recent years, with the development of Internet, the collection, dissemination and utilization of information have reached an unprecedented level in scale and speed. Information covers a wide range, including almost industrial and agricultural production, science and technology, education, culture and art, commerce, information, entertainment and leisure. On the Internet, shopping, online education, online stock market, telemedicine, on-demand movies, online conferences and online exhibitions have all become a reality, which is a great wealth of human science and technology and civilization and an inexhaustible information resource pool in the world. Abundant information resources have brought people problems: people are at a loss in the face of abundant information, and it is difficult to obtain the information they need most quickly and accurately in the vast amount of information. Therefore, in the mid-1990s, search engine technology for searching information resources of the World Wide Web appeared. World Wide Web is the most popular retrieval service system on the Internet at present. It uses hyperlink technology to connect global information resources, and users can access website pages through browsers. The 26th century is a highly informationized society. Information is a commodity, information is wealth, information is a resource and information is an opportunity, so everyone is eager to get useful information in time. If collecting information is the instinct of human survival and development, then information retrieval is the basic skill that every college student and researcher must have. Today, with the rapid development of computer and network communication technology, the Internet is spread all over the world, and we are in a vast ocean of information. In the face of such a world where new knowledge and technologies are constantly emerging and knowledge metabolism is frequent, it is impossible to acquire knowledge once and for all. Only by lifelong learning and constantly acquiring and updating knowledge can we not be eliminated by society. In order to obtain and use the latest information quickly and effectively, we must master the skills of information retrieval. College students should not only get "gold" during their study at school, but also get "touch of gold", one of which is information retrieval ability. By searching and using all kinds of information, we can not only deepen our knowledge; It can also broaden our horizons and broaden our knowledge; It also lays a foundation for self-learning predecessors' knowledge, constantly updating knowledge and engaging in scientific research and invention.