IS Technologies:
1. Hardware:
Hardware is the most visible part of any information system: the equipment such as computers, scanners and printers that is used to capture data, transform it and present it to the user as output.
Input devices:
Data may enter an information system in a variety of different ways, and the input device that is most appropriate will usually depend on the type of data being entered into the system, how frequently this is done, and who is responsible for the activity.
• The keyboard:
A lot of input still happens by means of a keyboard. Usually, the information that is entered by means of a keyboard is displayed on the monitor. The layout of most keyboards is similar to that of the original typewriter on which it was modeled.
• Pointing devices:
? electronic mouse : is an essential input device for use with any graphical
User interface. It consists of a plastic housing, designed to fit the palm of the hand, with a small ball at its bottom. Moving the mouse across a flat surface will translate the movements into a rolling action of the ball. This is translated into electronic signals that direct the corresponding movement of a cursor on the computer monitor. Buttons on the mouse can then be used to select icons or menu items, or the cursor can be used to trace drawings on the screen.
? Trackball: operates exactly like an “upside-down” mouse except that the ball is much larger and, instead of the mouse being moved over a surface, the user manipulates the ball directly. Originally Trackball is popular in educational laboratory settings and for laptop computers.
? Touch-screens: are computer monitors that incorporate sensors on the screen panel itself or its sides. The user can indicate or select an area or location on the screen by pressing a finger onto the monitor.
? Light and touch pens: Touch pens are more commonly used with handheld computers such as personal organizers. They have a pen-based interface whereby a touch pen (a pen without ink) is used on the small touch-sensitive screen of the handheld computer, mainly by means of ticking off pre-defined options.
? Data glove: It looks like a hand glove but contains a large number of sensors and has a data cable attached to it. The glove is currently used in virtual reality simulators where the user moves around in an artificially environment projected onto tiny LCD screens. The computer generates various imaginary objects, which the user can “pick up” and manipulate by means of the glove.
• Optical Scanners:
General-purpose scanners are used with personal computers to scan in images or text.
• Biometric devices are used to verify personal identity based on fingerprints, iris scanning. A scanning device is used to capture key measurements and compare them against a database of previously stored information.
• voice input devices
With voice control, the computer recognizes a very limited number (50 or less) of frequently used, programmable system commands (“save”, “exit”, “print”…) from a variety of users.
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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