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SDI
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1. Introduction: With the World Wide Web growing so rapidly each day and even each minute, the Internet just becomes to big to handle. In fig 1.1 is an example of an Information Overload; that is when too much information is retrieved, and the user cannot handle it. Techniques must be used to find the correct and relevant information. Information filtering or Selective Dissemination of Information is a “tool” that must be used when finding information on the Internet. It is important to know how to filter through information and precisely why a user must do so. There are many information filtering “agents” that can be used to assist the user in filtering through information. Some websites and companies use Push Technology to help the user to receive information easier. Fig 1.1 1.1 Research Problem: · What is the need for Personalized Information Services on the Web? Sub Problems: · What is an information overload? · What is the digital divide? · What is an information agent, and how does it work? · What is SDI? · What is push technology, and when is it used? 2. Selective Dissemination of information: 2.1 What is Selective Dissemination of Information? According to Dictionary.com selective dissemination of information is: “ A current awareness system, which alerts you to the latest publications in your specified field(s) of interest. A user registers at such a system with keywords representing his or her fields of interest, called a search profile. When new publications matching the search profile appear, the system informs the user of them instantly, periodically or upon request. Some systems may also be able to inform the user if changes in already notified publications occur.” Because of the huge size of the Internet these systems can be of great help to all users. 2.2 How does SDI work? Information dissemination systems do the searching on behalf of the user through the help of a WWW Robot. The robot is a program that automatically looks through hypertext structure and retrieves a referenced document. A web browser is not a robot because they are mostly operated by a human and does not automatically retrieve reference document. Web robots are sometimes referred to as Web Wanderers, Web Crawlers, or Spiders. Point 5 (Push Technology) discusses this further. 3. Digital Divide: Digital divide is a very big problem in the world, but especially in South Africa. It is Information rich VS information poor. Digital divide is not only caused by the lack of technology but the lack of computer and information literacy. To help the illiterate people push technology and web robots are used. 4. Web Robots Because the size of the Web increased beyond expectations, it became clear that manual browsing through a big amount of hypertext structures would no longer be possible. Web robots are implemented as a single software system that retrieves information form remote sites using standard Web protocols. 5. Freely Available Filtering Systems SIFT The Stanford Information Filtering Tool includes two selective dissemination services, one for computer science technical reports and one for USENET news articles. The source code is also available. Firefly A collaborative filtering service for music and movies. InfoScan A program, which filters email and USENET News and includes document visualization features. InfoTicker A web-watching robot with filtering functionality. NewsSieve A USENET News filtering system. iAgent A beta copy of an adaptive web filtering agent. WiseWire Empirical Media's filtering service that delivers webpages, newswire articles, and netnews. BORGES A USENET News filtering system using. RAMA A Unix based USENET news filtering. Browse An X windows neural network based USENET news filtering system. NewsClip A unix programming language designed for filtering USENET News that is capable of binary filtering when used with any newsreader. When used with STRN, the Scoring Threaded version of the unix ReadNews (RN) program, ranking articles in order of likely relevance is also possible. Sift-Mail An system for filtering electronic mail. SMART A unix package designed for performance evaluation of vector space information retrieval techniques. The capability to filter USENET News is included in the standard distribution. MAXIMS MAXIMS is a collaborative electronic mail filtering system. Procmail A unix package designed to automatically filter electronic mail. Maildrop A unix based mail delivery agent with filtering ability. Maildrop is intended as a replacement for Procmail. Maildrop can optionally read instructions from a file on how to filter incoming mail, and, based upon the instructions, deliver mail to alternate mailboxes, or forward it to somewhere else, like procmail. Unlike procmail, maildrop uses a structured filtering language that's a bit easier on the eyes. Mailfilt A perl script to filter electronic mail. Mailagent A rule-based electronic mail filtering system. WebWatcher WebWatcher is a World Wide Web filtering system which learns the user’s preferences and highlights interesting links on web pages that you visit. WebFilter A system which filters the content of World Wide Web pages in real time. FilterGus A simple Java Program that filters up textual documents. WebWasher A Window based program that filters ad. images on the Web. The program is free for personal, non-commercial home use or educational institutions. ScienceIndex A demo version of citation index available on the web, which aims to be a digital library for scientific literature in electronic form. Features include autonomous citation indexing, autonomous document location, citation context extraction, full-text indexing, awareness and tracking, related document retrieval, similar document identification, citation graph analysis, and query-sensitive document. Select A EU funded project that aims to develop a collaborative filtering system, which can help scientific, technical and other professional Internet users find information. ChaffAway An electronic library where anyone can post and search documents. It supports collaborative filtering by collecting votes from users. NoCeM A collaborative filtering system for Usenet. Filtering instructions are sent out in the form of PGP signed notices according to each user's personal criteria.
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