provided by the sensor and sending the barcode’s content to the scanner’s output port. Biometrics Biometrics[1] (or biometric authentication)[note 1] refers to the identification of humans by their characteristics or traits. Biometrics is used in computer science as a form of identification and access control.[2] It is also used to identify individuals in groups that are undersurveillance.[citation needed] Biometric identifiers are the distinctive‚ measurable characteristics used to label and describe
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KENDRIYA VIDYALAYA SANGATHAN JAMMU REGION . STUDY/SUPPORT MATERIAL 2011-12 CLASS: XII Computer Science ACKNOWLEDGEMENTS Chief Patron Shri Avinash Dikshit Commissioner KVS‚ New Delhi Patron Shri P. K. Koul Assistant Commissioner KVS‚ Jammu Region Guidance
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Generations of Computer Computer Age: Past‚ Present‚ and Future The First generation The Second Generation The Third Generation The Fourth Generation The Fifth Generation The Computer Age 1951-1958 The First Generation Vacuum Tube – – Rapid changes Four generations over 50 years Trends across generations – Decrease size – Increase speed Magnetic core memory Storage – – Heat Burnout Machine language Punched cards Tape (1957) Characteristics of 1st Generation Computers Computers
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Super Computer The fastest type of computer. Supercomputers are very expensive and are employed for specialized applications that require immense amounts of mathematical calculations. For example‚ weather forecasting requires a supercomputer. Other uses of supercomputers include animated graphics‚ fluid dynamic calculations‚ nuclear energy research‚ and petroleum exploration. The chief difference between a supercomputer and a mainframe is that a supercomputer channels all its power into executing a
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Laptop Computer vs. Desktop Computer A laptop is a computer which is designed to be portable. Usually this entails making sacrifices in terms of performance and utility. Laptops are intended for people who travel a lot and need a computer which can go with them. A desktop computer is meant to be stationary. This usually results in a lower price and better options for upgrading. Desktops are intended for permanent workstations and generally have more power and storage capacity than laptops.
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During the Windows startup process‚ the computer may stop responding (hang)‚ and you may receive the following error message: *** Hardware Malfunction Call your hardware vendor for support *** The system has halted *** One of the following error messages may also be included: NMI: Parity Check / Memory Parity Error NMI: Channel Check / IOCHK
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Advantages: 1. They allow people across the globe to communicate with each other‚ no matter at what time‚ via the use of email. 2. They allow people to look up information directly‚ instead of the use of searching through books. 3. Back-up copies of work can be made easily‚ without having to re-write everything. 4. People can work from home‚ and spend more time with their families because of this. 5. People with disabilities whom can’t write‚ can get software that allows them to speak and it
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How Do You Know When the Price Is Right? Robert J. Dolan‚ HBR Pricing is managers’ biggest marketing headache. It’s where they feel the most pressure to perform and the least certain that they are doing a good job. The pressure is intensified because‚ for the most part‚ managers believe that they don’t have control over price: It is dictated by the market. Moreover‚ pricing is often seen as a difficult area in which to set objectives and measure results. Ask managers to define the
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Computer Security Many commercial software packages are designed with computer security features that control who can access the computer. These types of access controls use a process called identification and authentication. Identification verifies that the user is a valid user‚ and authentication verifies that the user is who he or she claims to be. Three common methods of authentication are remembered information‚ possessed objects‚ and biometric devices. With remembered information‚ a
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Of the Computer By Kenneth H. Russell The invention of the personal computer took place about 50 years ago. Steve Jobs and others had developed the Apple+. Since then the whole world has affected by it in the following ways: 1. Computers balance financial transactions such as our personal bank account. 2. On a larger scale the IRS keeps track of every American in a variety ways by computer. 3. Our intelligence services keep track of people by computer who would do us harm. 4. Computers manufacture
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