Devices of Computers Computers perform the input, storage, processing, and output functions of the information system. In addition, computers and their devices need ways to communicate with one another. These devices are usually connected by electronic cables when located near each other. The factors that determine the reliability of an information system are the accuracy of data input, the convenience and quality of output, optimal use of storage devices, and the speed of a computer. Accuracy of data input is important, and computers ensure that the results are correct by not making mistakes that people do. There are many types of input devices and deciding which one to use could save time and improve accuracy. Optical scanning, for example, is best used for printing questionnaires and retail tags. Optical scanning input devices include optical character recognition (OCR), which recognize certain printed characters. The OCR is an optimum way to read printed questionnaires because the optical character recognition senses marks made on forms. Relative to this, bar-code scanning is one of the most common optical scanning input devices. This device recognizes a bar code, which is the series of bars of different widths found on retail tags in stores. Another optimal scanner used is simply called a scanner; this device uses light to sense an image on paper. Any type of image can be scanned and businesses use scanners to transfer long documents and images into a computer. They can then be changed, stored, or used in screen or printed output. In addition to using a scanner, magnetic scanning is another type of scanning input device that recognizes magnetic patterns. An example of magnetic scanning is magnetic ink character recognition... ... middle of paper ... ... primary storage at one time. The speed at which a computer can transfer data is measured in fractions of a second. CPUs are synchronized to run at the speed of an internal clock. With each tick of the clock, the CPU performs one step in executing an instruction. If the clock ticks more rapidly , then the CPU will run more rapidly. Clock speed is measured in megahertz or gigahertz. One megahertz is one million ticks per second and one gigahertz is one billion ticks per second. In conclusion, computers perform the input, storage, processing, and output functions of the information system. In addition, computers and their devices need ways to communicate with one another. The factors that determine the reliability of an information system are the accuracy of data input, the convenience and quality of output, optimal use of storage devices, and the speed of a computer.
In design of user interface, input controls are an essential element of any type and permits clients to execute different functions to make sure that input data is accurate, protected and complete. Data input controls make sure suitability, comprehensiveness, and accuracy of data throughout its transformation into application of computer or into data of a computer from its actual source. Both scheduled automated processing and manual online input may be used for penetration of data into an application of computer from. The designer of input control must define the satisfactoriness of both and manual controls over input of data to make sure that data is input correctly with most favorable exercise of computerized editing and validation and that procedures of error handling helps the accurate and timely resubmission of all approved data. Audit and Management Advisory Services educate clients that edits of input should be employed with a computer or form application, these input edits range from checks for unacceptable characters, invalid
In the world today, computers are used in every field. Be it a major space exploration or a small chore like cleaning our room. The use of computers has made our lives easier but at the same time a computer failure can make our lives miserable too. We trust computers more than we trust anything else these days. We use computers to communicate, share personal information, buy goods online, etc. We also trust computers with our safety. Starting from house alarm systems and other safety devices we have now moved on to using computers to Test Car Crashes.
1.0 IntroductionIn this report I will be concentrating on the failure of software systems. To understand why software systems fail we need to understand what are software systems. Software systems are a type of information system. This is because a software system is basically a means for hardware to process information. Flynn’s definition of an information system is:"An information system provides procedures to record and make available information, concerning part of an organization, to assist organization-related activities."Humans have been processing information manually for thousands of years, but with the vast increase of demand for knowledge this century has meant that a new method of information processing has been needed. Software systems have provided a new means that is much faster and efficient.
A barcode is a visual representation of data that is checked and utilized for data. Bar code is simple to control equipment and tool inventory. In facilities supervisors can use barcodes to link work orders, purchase orders, spare parts and equipment which can be further used to track and collect cost. In barcodes historical data can be used to predict the seasonal fluctuation accurately. Barcodes are printed specifically on the paper or a plastic object, therefore actualizing a standardized identification framework is far less expensive than the RFID innovation.
Computers; they are a part of or in millions of homes; they are an intricate part of just about every if not all successful businesses, the government, and the military. Computers have become common place in today’s society and the lives of the people who live in it. They have crossed every national, racial, cultural, educational, and financial barrier, which consequently ushered in the information age. A computer is a programmable electronic device that can store, retrieve and process data, and they come in all shapes, and sizes. They can be used for and in just about anything. As stated before, they are used in just about every aspect of modern society. They are so fundamental to modern society that it would be disastrous to society without them. As stated before, there are many areas in modern society that are run by computers. They play an intricate part of millions of homes in the world. Office workers in business, government and the military may use them to write letters, keep rosters, create budgets, find information, manage projects, communicate with workers, and so on. They are used in education, medicine, music, law enforcement, and unfortunately crime. Because computers have become such a part of the world and how it operates, there is a tremendous responsibility for those who are in control of these computers and the vital information that they carry, to manage and protect them properly. This is management and protection is vital because any loss or damage could be disastrous for the affected entity. For example, a mistake or intentional alteration of a personal credit file could affect ones ability to buy a car or home, or can lead to legal actions against the affected person until the mistake or intentional alteration has been corrected. Therefore, with the advent of computers in the information age, and all of the intentional and unintentional violations against them, comes the need to safeguard them and the information they carry with strong systems and policies of computer security.
Technology factors relate to the system software, support for legacy systems and the IT infrastructure on which the system will be put on. Information systems are powered by information technologies which need to last throughout the system development life cycle.
a scan tron machine is extremely accurate. By having the original and then having an electronic devise read according to where a mark is physically placed on a sheet of paper or scorecard is quick and accurate.
Barcodes are used everywhere around us. They are used to track products through shipment, track products at a store and speed up and enhance the checkout process, as well as allowing faster access to information. Barcodes began to be used heavily in the 1970’s. This began a great movement in the consumer industry, speeding up the checkout process and allowing easier inventory tracking. However, just like all technologies, barcodes have been enhanced many times over and are being replaced by better, more efficient systems (Bonsor).
"Alan Kay has remarked that had Vannevar Bush enjoyed working in all-night coffee shops, he would have invented the portable computer." (Press, 1993, p.31)
The computer evolution has been an amazing one. There have been astonishing achievements in the computer industry, which dates back almost 2000 years. The earliest existence of the computer dates back to the first century, but the electronic computer has only been around for over a half-century. Throughout the last 40 years computers have changed drastically. They have greatly impacted the American lifestyle. A computer can be found in nearly every business and one out of every two households (Hall, 156). Our Society relies critically on computers for almost all of their daily operations and processes. Only once in a lifetime will a new invention like the computer come about.
It’s prime role is to process data with speed once it has received instruction. A microprocessor is generally advertised by the speed of the microprocessor in gigahertz. Some of the most popular chips are known as the Pentium or Intel-Core. When purchasing a computer, the microprocessor is one of the main essentials to review before selecting your computer. The faster the microprocessor, the faster your data will process, when navigating through the software.
A computer is a combination of several parts. These parts are Random Access Memory (RAM), a Central Processing
Computer is one of the greatest man made invention,. In short period since the "invention" of the computer, its impact on our lives has been felt in a variety of ways. From the work place to the home, the computer is rapidly becoming an indispensable tool. Our computer technology has been undergoing significant improvement over years. Modern technologies such as computers, cameras and mobile phones which are already on the market since early 20th century are not the same as its now. On every aspect, such as function and capabilities, it is the things that bring the development of computer and technology from 1980 to 2014.The word computer itself means an electronic device for storing and processing data, typically in binary form according to
In designing a computer system, architects consider five major elements that make up the system's hardware: the arithmetic/logic unit, control unit, memory, input, and output. The arithmetic/logic unit performs arithmetic and compares numerical values. The control unit directs the operation of the computer by taking the user instructions and transforming them into electrical signals that the computer's circuitry can understand. The combination of the arithmetic/logic unit and the control unit is called the central processing unit (CPU). The memory stores instructions and data.
Computers are helpful because they offer a wide range of functions and services that are not available anywhere else. There are four main uses: word processing, internet/communications, digital video/audio composition, and desktop publishing. Although one can create a typed paper with a typewriter, the computer has more features