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Showing posts from May, 2013

Data mining, Data warehousing, Data marts, DATA MINING TECHNIQUES AND THEIR APPLICATION

(i)                  Data mining Data mining (sometimes called data or knowledge discovery) is the process of analyzing data from different perspectives and summarizing it into useful information - information that can be used to increase revenue, cuts costs, or both. Data mining software is one of a number of analytical tools for analyzing data. It allows users to analyze data from many different dimensions or angles, categorize it, and summarize the relationships identified. Technically, data mining is the process of finding correlations or patterns among dozens of fields in large relational databases. Data mining is primarily used today by companies with a strong consumer focus - retail, financial, communication, and marketing organizations. It enables these companies to determine relationships among "internal" factors such as price, product positioning, or staff skills, and "external" facto...

Ten output devices, advantages and disadvantages, inter-site back-up mechanism, Expert systems for medical diagnosis,information systems security

(i)Printer Printer enables us to produce information output on paper. It is one of the most popular computer output devices we often use to get information on paper - called hard copy. Advantage They produce high quality paper output for presentation at a speedy rate. It is also possible to share the printer among different users in a network. Disadvantage The cost for maintenance of the printer equipment as well printing ink is cumulatively high. (ii) Plotters These devices are used to produce graphical outputs on paper. They have automated pens that make line drawings on paper Advantage They can produce neat drawings on a piece of paper based on user commands. In Computer Aided Design (CAD) they are used to produce paper prototypes that aid in design of the final system. Disadvantage They are more expensive than printers. Further, the command based interface is difficult to use. (iii)Monitor It is...