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With a mission to furnish a service that features crystal-clear connections, rectified and amended reliability and a hassle-free experience for customers, the PCS technology stands to change the way people use wireless communications. "Let's begin with the basics, and discuss what analog cellular is all about. In North America, we use a system known as AMPS. This system has its beginnings in 1975 when AT&T began to look into a replacement for their old mobile telephone system. The trouble with the earlier system was a distinct lack of capacity. Within a metropolitan area, only about 20 or 30 subscribers could use the system at any one time. Back in those days however, few people could afford a mobile phone, and those that had them didn't use them all that frequently." The FCC uses PCS (Personal Communication Services) to depict a newer class of wireless communications services currently authorized. PCS systems use a different radio frequency, the 1.9 GHz band, than cellular phones and commonly use all-digital technology for transmission and reception.
Pages: 3
Bibliography: 4 source(s) listed
Filename: 800 PCS Vs Cell phone.doc
Price: US$26.85
520.822 Tcp/Ip Vs Multicasting
1TCP/IP is a set of protocols developed to allow supporting computers to ration resources across a network. A community of researchers centered on the ARPAnet developed it. Certainly the best-known TCP/IP network is the ARPAnet. Starting with the basic definitions. The most accurate name for the set of protocols we are describing is the "Internet protocol suite". TCP and IP are two of the protocols in this suite. Because TCP and IP are the best known of the protocols, it has become common to use the term TCP/IP or IP/TCP to refer to the whole family. It is probably not worth fighting this habit. However this can lead to some oddities. For example, I find myself talking about NFS as being based on TCP/IP, even though it doesn't use TCP at all. (It does use IP. But it uses an alternative protocol, UDP, instead of TCP. All of the above terminologies will be talked about later in the report. TCP/IP is a family of protocols. A few contribute "low-level" functions required for many applications. These include IP, TCP, and UDP. Others are protocols for doing particular tasks, e.g. transferring files between computers, sending mail, or finding out who is logged in on another computer. Initially TCP/IP was used particularly between minicomputers or mainframes.
Pages: 12
Bibliography: 7 source(s) listed
Filename: 822 Tcp/Ip Vs Multicasting.doc
Price: US$107.40
521.824 Refrigeration And Its Importance To The World
Refrigeration is the process of removing heat from an enclosed space, or from a substance, to lower its temperature. A refrigerator uses the evaporation of a liquid to absorb heat. The liquid, or refrigerant, used in a refrigerator evaporates at an extremely low temperature, creating freezing temperatures inside the refrigerator. A liquid is rapidly vaporized (by means of compression) - the quickly expanding vapor thus requires kinetic energy and therefore draws the energy needed from the immediate area - which loses energy and becomes cooler. Cooling that is caused by the rapid expansion of gases is the primary means of refrigeration today.
Do you want a great way to teach scientific method? As simple as using the earthworm to express the different steps in scientific method. There are six steps to the scientific method: Formulate, Hypothesis, Observation, Experiment, Collect Data, and Draw Conclusion (Scientific Method 1). The earthworm is an important part of agriculture so science has been interested in the segments and locomotion of it. Put the scientific method and the earthworm together and science finds the earthworm interesting.
Pages: 4
Bibliography: 8 source(s) listed
Filename: 838 Science and Earthworm.doc
Price: US$35.80
523.847 SpyWare and Computer Surveillance Techniques
This paper discusses spy ware and computer surveillance techniques. SpyWare also known as "adware" is a hidden software program that transmits user information via the Internet to advertiser in exchange for free downloaded software. Forget surveillance cameras, now your every action online could be being recorded without your explicit consent. This practice must be brought out into the open, so that you have a choice before giving out highly personal information. That's what this issue is primarily about choice and awareness. It has been confirmed that software companies who denied their software was even able to forward personally identifying information were not telling the truth. Using combinations of Machine and MAC address codes you can be tracked.
This paper examines the Xbox operating system, what makes it different, why Microsoft produced the console, and what its future may be.
Pages: 3
Bibliography: 4 source(s) listed
Filename: 16247 computer console development.doc
Price: US$26.85
525.16257 Microsoft?s Windows and PC?s Architecture
When people talk about computers, they often think about Microsoft Windows and its relationship to computers. What is the history of Microsoft?s Windows? How does Windows complement PC?s architecture? Perhaps the first step to studying Microsoft Windows is to study the history of it. The next question is to study the relationship of Windows and the future of it. The first place to consider the history of Microsoft Windows is Microsoft Windows? website. ?On November 10, 1983, Microsoft announced Microsoft Windows, an extension of the MS-DOS operating system that would provide a graphical operating environment for PC users? (Microsoft.com 2003). Most PC users will tell state Microsoft Windows operating system began in the 1990 with the release of Windows 3.0. This essay will discuss Microsoft Windows, the relationship to PCs architecture, and possible future of Windows.
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