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
A desktop computer consists of a computer system unit, a keyboard, a mouse, and a monitor. These are also input devices which are the devices used to input data in the computer or used to provide data and control signals to an information processing system. The computer system unit is the enclosure for all the other main interior components of a computer. The primary function of the computer system unit is to hold all the other components together and protect the sensitive electronic parts from the outside elements.
A computer system comprises of one or several computers of which all of them are associated with the common software or rather one storage space. This system could have other computer peripherals connected to them. All of these computers can operate independently as well as the ability of communicating with each other.
The use of computer technology has revolutionized many parts of today’s society. Everywhere one looks there is the use of computers. In most cases, computers are extremely beneficial to many people in various occupations and even in their personal lives. In one way or another, the use of computer technology can be linked to almost every occupation in the world.
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.
For any data system to fill its need, the data must be accessible when it is required. This implies the computing systems used to store and process the data, the security controls used to ensure it, and the correspondence channels used to get to it should work accurately. High accessibility systems plan to stay accessible constantly, counteracting administration interruptions because of energy blackouts, equipment disappointments, and system updates. Guaranteeing accessibility additionally includes preventing denial-of-service attacks.
“You can avoid reality, but you can not avoid the consequences of avoiding the reality” (Ayn Rand, 1905-1982). In Moth Smoke by Mohsin Hamid, the air-conditioning is one of the most significant details in the novel that represents some of the themes that Hamid wants to emphasize. Besides jewelry, enormous house, and high-priced car air-conditioner is one of the elements that distinguish wealth from poverty. More than that, one of the reasons why Mumtaz falls in love with Daru relates to the air-conditioner. That air conditioner not only produces cool air but also generates the hot air is compelling because it represents some dualities that exist in the novel. Also, despite making people feel more comfortable during hot weather, air conditioner is artificial, which is similar to some relationships as well as some perspectives in Moth Smoke.
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.
As data processing cycle is computerized, thus ensures accuracy in data input and information output.
1 ) Principles of Information Systems, Ralph and George W.Reynolds M.Stair , Fourth Edition .
Science and technology constantly evolving and changing. The latest released product will surpassed the earliest. The earliest will only become a history. Therefore, computer scientist are striving to develop and finding the newest and ideal to fulfill the need of users. This assignment aimed to identify the computer components, its function, its importance as well as the latest and the future technologies of the pointing devices, central processing unit (CPU), memory, disk controller, disk, and monitor.
In order for an information system to be functional it requires to have the following in order to be operational.
The security of computer hardware is important because the physical technology is needed for these devices to function. The computer hardware can be harmed by various problems. These include electrical problems, theft, physical damage, water, and poor maintenance. The hardware can be damaged if the proper
Information Systems is an academic study of systems with a specific reference to information and the complementary networks of hardware and software that people and organizations use to collect, filter, process, create and also distribute data. An emphasis is placed on an information system having a definitive boundary, users, processors, storage, inputs, outputs and the aforementioned communication networks
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.