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Search results 2141 - 2150 of 8374 matching essays
- 2141: Technological Literacy
- ... the way we communicate, and how we access, produce, and distribute information and knowledge. Yet the internet too is generating virulent responses from the public and social critics about its `anarchic' nature: the inability to control it, to censor it, to manage and limit it. The internet gets a lot of bad press particularly in relation to that age-old concern over various forms of pornography, issues concerning `electronic stalking', and ... of the global digital village tend to assume a shared consciousness and understanding among groups and societies differently situated in what is still a world of profoundly hierarchised political and economic orders of power and control over knowledge and resources. Information rich and information poor societies, and groups within those societies, still tend to be demarcated along north-south and east-west axes as well as divides of social class, gender ... which they progress through their education" (Petre & Harrington, 1996, p. 107). This is as relevant for primary school students as it is for adult learners. Letting go of long cherished tenets of teacher authority and control over all aspects of student learning may not be easy for many teachers trained in chalk and talk pedagogy, even in its `student-centred learning' variant. But cybereducation benefits not only students. The networked ...
- 2142: Cable Modems and ADSL
- ... considerably from vendor to vendor. The downstream channel is continuous, but divided into cells or packets, with addresses in each packet determining who actually receives a particular packet. The upstream channel has a media access control that slot user packets or cells into a single channel. To avoid collisions, the system gates each upstream packet onto the network with control signals embedded in the downstream information stream. (Some cable modem configurations divide the upstream into frequency channels and allocate a channel to each user. Others combine the two multiplexing methods. A few modem companies are ... existing copper telephone lines. As the name suggests, they realize downstream speeds up to 9 Mbps, but upstream speeds up to 640 Kbps. As ADSL operates point- to-point, it does not need media access control, and each user gets the full rate available continuously. However, ADSL modem speeds do depend upon line distance, and the longer lines found today may support speeds no greater than 1.5 Mbps. The ...
- 2143: Quantum Computers Fact -or- Fantasy?
- ... gates that would transmit the information is what is mainly focused on by researchers today, this single quantum logic gate and it's arrangement of components to perform a particular operation. One such gate could control the switch from a 1 to a 0 and back, while another could take two bits and make the result 0 if both are the same, 1 if different. These gates would be rows of ... shining on ions cause a transition from one quantum state to another which can alter the type of collective motion possible in the array and so a specific frequencies of light could be used to control the interactions between the ions. One name given to these arrays has been named "quantum-dot arrays" in that the individual electrons would be confined to the quantum-dot structures, encoding information to perform mathematical ... of those whole numbers. The "quantum-dot" structures would be built upon advances in the making of microscopic semiconductor boxes, whose walls keep the electrons confined to the small region of material, another way to control the way information is processed. Craig Lent, the main researcher of the project, base this on a unit consisting of five quantum dots, one in the center and four and at the ends of ...
- 2144: The Computer
- The Computer A machine that performs tasks, such as mathematical calculations or electronic communication, under the control of a set of instructions called a program is a computer. Programs usually reside within the computer and are retrieved and processed by the computer's electronics, and the program results are stored or routed ... variety of ways. In business, computers track inventories with bar codes and scanners, check the credit status of customers, and transfer funds electronically. In homes, tiny computers embedded in the electronic circuitry of most appliances control the indoor temperature, operate home security systems, tell the time, and turn videocassette recorders on and off. Computers in automobiles regulate the flow of fuel, thereby increasing gas mileage. Computers also entertain, creating digitized sound ... thought of as the CPU's tiny scratchpad, temporarily storing instructions or data. When a program is run, one register called the program counter keeps track of which program instruction comes next. The CPU's control unit coordinates and times the CPU's functions, and it retrieves the next instruction from memory. In a typical sequence, the CPU locates the next instruction in the appropriate memory device. The instruction then ...
- 2145: Accounting Information Systems in A Changing Environment
- ... computer is the central processing unit (CPU). The CPU is the heart of the computer, its function according to P.M.Q. Lay et al. (1993: 64) is to store data and programming instructions, to control the sequence of operations being performed by the computer, to give commands to all parts of the system, and to carry out the necessary processing required by the program instructions. In order to keep data ... most common reports are the balance sheet, income statement and cash flow statement. Managerial reports are also created to reflect the status of operations or resources. Other reports can be created to assist planning and control objectives of management. Using computers has the following advantages: - Most reports are automatically created saving time. - Computer generated reports are more accurate. - Complicated concepts such as strategic planning and ratios are simplified because the accounting ... accounting records; it is used to trace transactions from the source document to the financial outputs. A batch total enables errors in posting to be detected. Journal vouchers provide added security because they contain a control number and include spaces for the name of the individual who prepared the account. The advantages of a computerised system are: - Audit trails are automatically created, promoting easy auditing and saving time and money. - ...
- 2146: The Internet
- ... the Internet. Many of these groups feature large, active, and sometimes raucous discussions on the widest imaginable range of interests, hobbies, and activities. Anything from antique cars, new business opportunities and personal investing to politics, gun control, sex, and The Simpsons. Participating in these Of course, like most other things, the Internet isn't all good and gloryice. You could say that the Internet is like the Wild West of the late ...
- 2147: The Computer Revolution
- ... now come to expect from IT in today's society. As storage and hardware became progressively cheaper throughout the late sixties and seventies, the uses which companies put IT has greatly broadened to encompass process control, word processing, spreadsheet control of accounts and in the field of robotics. The uses of IT in process control have enabled products to be produced at a high, uniform speed to quality within specific tolerances. From food packing plants to chemical plants, computer controlled industrial processes have revolutionised production. This has drastically reduced ...
- 2148: A Quantum Computer
- ... gates that would transmit the information is what is mainly focused on by researchers today, this single quantum logic gate and it's arrangement of components to perform a particular operation. One such gate could control the switch from a 1 to a 0 and back, while another could take two bits and make the result 0 if both are the same, 1 if different. These gates would be rows of ... shining on ions cause a transition from one quantum state to another which can alter the type of collective motion possible in the array and so a specific frequencies of light could be used to control the interactions between the ions. One name given to these arrays has been named "quantum-dot arrays" in that the individual electrons would be confined to the quantum-dot structures, encoding information to perform mathematical ... of those whole numbers. The "quantum-dot" structures would be built upon advances in the making of microscopic semiconductor boxes, whose walls keep the electrons confined to the small region of material, another way to control the way information is processed. Craig Lent, the main researcher of the project, base this on a unit consisting of five quantum dots, one in the center and four and at the ends of ...
- 2149: Internet Censorship
- ... whether to classify the internet as a print medium like newspapers, or a broadcast medium like television. Unfortunately it is a communications medium and should be treated as such. If such legislation was passed to control telephone conversations, many teenagers would get the electric chair at age fifteen. The Communications Decency Act never passed, but a line in the telecommunications bill that did pass denounces anything "indecent" being transmitted. The legal ... be the adoption of government controls that would infringe on peoples rights to free speech, but also make the net a safe place to be. The other would for parents to use filtering software to control what their computer is receiving. Government controls may seem attractive as it limits information like bomb plans and chemical analysis of explosive that terrorist groups or your next door neighbor can exploit to do evil ... and void." His views are shared by hundreds of people in his situation in cyberspace. The U.S. government can only limit the content of computers in the U.S. if that, it can never control the content of computers outside the U.S. border. Since the internet is a worldwide network, computers from the U.S. are always linked to countries like Amsterdam and France; countries whose commercials have ...
- 2150: How Technology Has Hurt Us
- ... problems such as air pollution. Cities are becoming more and more congested with people using their cars even for short distances. The government is trying to make this better by making cars pass an emmission control test. Another problem with cars is that hundreds of people die or get seriously injured each year. Another technical invention that maybe we would have been better without is weapons. Although weapons were made to ... opposite. Drive by shootings are a daily occurence in our big cities. More people are turning the guns on themselves. Kids bring guns to school with them for protection against people who may use a gun on them for retaliation. Politically its divided the nation on whether private citizens should be able to carry guns. Disposable items have caused a big garbage problem. We use everything from disposable pens to disposable ...
Search results 2141 - 2150 of 8374 matching essays
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