Internet information Accessibility is a qualified quality of graduate students. Timely and accurately acquire research progress in the field, it is the premise of ensuring the innovation of research work; it is an effective means of expanding the knowledge of the knowledge. It is a resolution in the information of the knowledge of the smoke. An effective way for the problem.
With the rapid development of the Internet, the amount of information that can be obtained is growing, and even problems such as information overload, resources are prostitutes [1]. The search engine has solved the problem of Internet information to a certain extent. In recent years, there have been four or five hundred documents in China to explore Internet information acquisition and various search engines from various applications background and technical perspectives, usage, etc. [2], how to systematically improve graduate students Internet Information Accessibility (specifically, which indicators or scale should be grasped in Internet information, how to grasp) is a new issue worth exploring and summarizing. This article proposes Internet information to obtain breadth, purity, depth, speed
The degree and the intensive five indicators, combined with the actual needs of the graduate paper, explore the method and techniques of the Internet information acquisition with Google (www.google.com) for Internet information. First, Internet information is widely expanded, graduate students are more unfamiliar when they have just stepped into a certain field of research, even blank, from the Internet to get relevant information for learning is not a convenient way . By guiding the intersection of Internet information, it can effectively expand the knowledge related to the research field. Internet Information Get Scenario is defined as W = Iacquired / IINTERNET, where IACquired is the amount of information that has been obtained, and IInternet can get the amount of information for the Internet. The amount of information is generally the number of web pages or the number of documents. The broaden expansion, that is, the W value, from the user's perspective, can only be implemented by increasing the IACquired value, IACquired is limited by the search engine index and the system restriction, also subject to the user search instruction, can be selected by selecting the appropriate Search engine and expand the necessary keywords to expand the breadth of Internet information. Example 1. Select English Google to expand the language range of available information. Google's web-page index has nearly 43 billion, covering more than 250 countries, supporting 132 languages, is currently the largest search engine. When using Google for the first time, Google determines the language interface according to the current operating system (mainland China is generally simplified in Chinese). For China's graduate students, most of the language familiar is Chinese and English, and for other languages, even if search is, it may not be able to understand. If you change Google's use language settings to English, you can search for Italian, French, Spanish, German and Portuguese data, and Google can provide its English translation (click on the "Translate this Page" super link behind your search results. Carcly, this greatly expands the language range of available information. For example, about the Robot's French page 765 000 pages, German page 163 000 pages, these web pages are not able to use Chinese Google's strength. Example 2. Expanding keywords and expanding coverage of related information. Taking the knowledge of "Submarine Safety" related knowledge, it is possible to search for keywords to be: submarines, submarines, submersible, underwater, ocean, naval, safety, crash, accident, sea loss, sink, escape, rescue, life , Lifeboat, life bell, lifebar, hidden, indispensable, water, communication, sona, torpedo, mine, attack, anti-submarine, underwater operation, hydroction, underwater robot, underwater, Submarine, Life Saving, Rescue, Simulation, Underwater, etc., and then make the extended keywords appropriately combine. For example, only "Submarine Safety" is used as a keyword to search all websites in Google, you can only find 43,300 web pages, and use "submarine safety" to search 14 300 web pages (where 3 000 web pages are used The "Submarine Safety" search is not included in the results of "Submarine Life Saving" can also be searched for 51 700 web pages. In the search process, you can start from the synonym, synonym, antonym, homophysical word, wrong word (pinin, five-stricken, spelling wrong), other words, pass, simplicity, traditional characters, Chinese, foreign language, abbreviation, etc. Gradually expand. Internet information has been expanded, ensuring the comprehensiveness and extensive information acquisition, but often brings a negative effect of information overload, which involves how to control information acquisition purity issues.
Second, Internet Information Getting Purity Control Internet Information Getting Purity Definition P = IVALUABLE / IACQUIRED, where IVALUABLE is the amount of information available with available value, and P is meaningful when W> 0. The increase in p value can only be implemented by reducing IACquired, and the increase in the W value is a contradiction process in the opposite direction. The search engine is the prerequisite for improving the purity (Google uses PageRank patented technology to provide high-quality search results), and the user's search instruction is a direct means of controlling purity. The basic practice of searching information is to increase keywords (logic and), reduce keywords (logic non-) or phrase search, and these features are supported in the general search engine. In Google, you also support a search for a specific file type (FileType), Site Domain Name (Site), URL (InURL or AllinURL) and web headings (INTITLE or AlLintitle). Example 3. Reduce search range using logical combination. Table 1 for the Search for "Intelligent Robot Technology" as an example, Table 1 shows the results of the search results in Google in Google. From Table 1, you can clearly see the process and effects of purity control.
Table 1 Using logical combination search Search Mode Keywords Express Searching Webpage Word Robot 6 430 000 Word Logic with Intelligent Robot 526 000 Word Logic with Agent Intelligent Robot 109 000 Word Logic & Agent Intelligent Robot -InterNet 49 900 phrase Logic with, non-Agent "Intelligent Robot" -InterNet 850
Example 4. Search within a specific range using qualifiers. Taking Search for "MIT Robot Research Document" as an example, Table 2 gives the search results in Google in Google sequentially define the website domain name, URL, and file type. It can be seen from the searchable web link (limited to the limit) that the specified word search is very strong, the search results are quite accurate. Table 2 Search for search method Keywords express Search Search page number Robot 6 430 000 Limited Website Domain Name Robot Site: Mit.edu 12 800 Limit URL Robot Site: mit.edu InURL: Publications 247 Limited File Type Robot Site : mit.edu Inurl: Publications FileType: PDF 148
Third, the Internet information takes place before the opening of the graduate opening questions, you need to read a large number of special literature. Professional technical literature on the Internet, most of which are stored in a variety of web databases, and the normal search engine is generally dusty to these databases, and the online retrieval system for each Web database must be used to mine the necessary information acquisition depth. Internet information Get depth defined as D = IWEB-DB / IVALUABLE, where IWEB-DB is the amount of information retrieved from the web database, and D is meaningful when IVALUABLE> 0, and the improvement of D value can only rely on IWEB-DB. Value is implemented. The existing Web database varies, but the retrieval method of the scientific literature database is similar, which generally needs "login-retrieval-download" several links. Each university library will provide the literature database search entry, account information and use guidelines available in this school. 4. Increase the Internet information acquisition speed The Internet information is defined as, where tsearch is a search time taken by the available information, or the information purification time. Improved the S value can be achieved by increasing the purity P value or lower the TSEARCH value. The Tsearch value is affected by the speed of search engine, but there is little impact. For example, Google has more than 15,000 servers, more than 200 T3 broadband, search usually no more than 0.2 seconds, so the TSEARCH value is mainly affected by search methods If you can directly provide (rather than repeated trials) as complete as possible, the necessary keywords are used as query clues and can be quickly locate them to target information with special functions of search engines. This process is consistent with the increase in purity with information, which is the process of accelerating the increase in p value. Example 5. Acquire information with "Good Great" to get information in place. In the work of the paper, graduate students often need to check the publications list of a laboratory, an university library electronic resource, etc. to understand relevant research information or retrieve the download document, but not to remember the URL. You can use the target website as a full-edible name as a keyword, using the "good luck" function of the Google Home, usually you can directly open the target web page, you don't have to delay the URL in the URL. For example, use the "Tsinghua University Library" to do keywords, click the "Good luck" button to enter the Tsinghua University Library Home: http://www.lib.tsinghua.edu.cn/. V. Internet information Gets the intensive enhanced Internet information Get melancholy (ie flexibility) is defined as f = (w p d s) / 4, this is the evaluation Internet information
The comprehensive indicator of the effect, the four indicators discussed earlier rely on the functions supported by the search engine or retrieval tool, and this indicator rely more on the user's experience and skill. Enhanced Internet Information Getting Flexibility requires users to extract and combine keywords, the distribution of target information on the Internet and the possible existence form and the use of each search engine are quite familiar with the extent. Example 6. Enhance the information to get a function with the live search engine. Graduate students often encounter unfamiliar terms or abbreviations that can not be encountered by search engines to assist translations. "RC" in the translation "these Activities Including, Soil and Rock Chip Sampling, Geophysical Surveys and RC and Diamond Drilling." Is in Jinshan Words (http://www.iciba.net), Yinghua Golden Dide (Http://www.powerdict.com), Dictionary (http://dictionary.com) is found in online dictionaries, and they are not found, considering using search engines. Table 3 gives the process of Internet translation information, step 6 Search "... Both Diamond and Reverse-Circulation (RC) DRIAMOND ...", step 7 Search "... Anti-cycle drilling. Reverse Circulation Drilling ...", This determines that "RC" is an English abbreviation for "anti-cycle drilling". Table 3 Get Relationship Information Step Search Range Keyword Expression Search Results (Item) 1 Jinshan Words RC 02 英 华 金 典 r r r 中文 网 RC 103 0005 Google All Site RC 14 900 0006 Google All Website RC Diamond Drilling 12 1007 Google Simplified Chinese Website Reverse Circulation 417
Reference 1 Wang Jongcheng et al. Progress of Web Information Retrieval. 2001,38 (2): 187-1932 Jiang Fang. Search Engine Tips. Science and Technology Information Development and Economy, 2003, 13 (5): 178-179
