With diagrams compare Essay Example for Free

With diagrams compare Essay This type of communication is between the sender and the receiver is known as connectionless (rather than dedicated) Contrasted with packet-switched is circuit-switched, a type of network such as the regular voice telephone network in which the communication circuit (path) for the call is set up and dedicated to the participants in that call. For the duration of the connection, all the resources on that circuit are unavailable for other users. Voice calls using the Internets packet-switched system are possible. Each end of the conversation is broken down into packets that are reassembled at the other end. The principles of packet switching are as follow. Messages are divided into data packets, which are then directed through the network to their destination under computer control. Besides a message portion, each packet contains data concerning. The principles of packet switching are as follow. Messages are divided into data packets, which are then directed through the network to their destination under computer control. Besides a message portion, each packet contains data concerning: Â  The destination of the address; Â  The source identification; The sequence of the packet in the complete message; Â  The detection and control of transmission errors. Â  Pre-determined routing. With this method, the routing details are included in the packet itself, each switching exchange forwarding the packet according to the embedded instructions; Â  Directory routing. Each switching exchange has a copy of a routing table to which it refers before forwarding each packet. The appropriate output queue is determined from the table and the packet destination Diagram shown below: Identify three types of cabling used in data communication. State which one you would recommend in an implement requiring high security consideration and why? The three types of cables used in data communication are: Optical Fiber Coaxial Coaxial cable is a copper that is used by TV companies between the community antenna, and also the user homes and businesses. At times these cable are also used by telephone companies from their central office to the telephones near users. This is also widely installed for use in business and corporation Ethernet and other types of local area network. Coaxial cable is called coaxial this is because this includes one physical channel that carries the signal surrounded (after a layer of insulation) by another concentric physical channel, both running along the same axis. The outer channel serves as a ground. Many of these cables or pairs of coaxial tubes can be placed in a single outer sheathing and, with repeaters, they can carry information for a great distance. This is a diagram shown below: UPT UPT stands for Unshielded twisted pair. This cable is the most common kind of copper telephone wiring. Twisted pair is the ordinary copper wire that connects home and many business computers to the telephone company. To reduce crosstalk or electromagnetic induction between pairs of wires, two insulated copper wires are twisted around each other. Each signal on twisted pair requires both wires. Since some telephone sets or desktop locations require multiple connections, twisted pair is sometimes installed in two or more pairs, all within a single cable. For some business locations, twisted pair is enclosed into a shield that functions as a ground. This is known as shielded twisted pair (STP). The twisted pair is now frequently installed with the two pairs to the home, with the extra pair making it possible for you to add another line (perhaps for use of a modem) when you will need it. These twisted pair comes with each pair uniquely colour coded when it is packaged in multiple pairs. Different uses such as analogue, digital, and Ethernet require different pair multiples. Although twisted pair is often associated with home use, with a higher grade of twisted pair is often used for horizontal wiring in LAN installations because it is less expensive than coaxial cable. The wire that you buy at a local hardware store for extensions from your phone or computer modem to a wall jack is not twisted pair. It is a side-by-side wire known as silver satin. The wall jack can have as many five kinds of hole arrangements or pin outs, depending on what kinds of wire the installation you expects that will be plugged in (for example, digital, analogue, or LAN) . (Thats why you may sometimes find when you carry your notebook computer to another location that the wall jack connections wont match your plug. ) This is a diagram shown below: Optical Fiber. Optical fiber (or fiber optic) refers to the medium and the technology associated with the transmission of information as light pulses along a glass or plastic wire or fiber. Optical fiber carries much more information than the conventional copper wire and is in general not subject to electromagnetic interference and the need to retransmit signals. Most telephone company long-distance lines are now of optical fiber. Transmission on optical fiber wire requires repeaters at distance intervals. The glass fiber requires more protection within an outer cable than copper. For these reasons and because the installation of any of the new wiring is labour-intensive, few communities yet have optical fiber wires or cables from the phone companys branch office to local customers (known as local loops). A type of fiber known as single mode fiber is used for longer distances; multimode fiber is used for shorter distances. This is the diagram shown below: By analyzing and researching the three above cable I would recommend the Fiber Optic cable this is because I believe it has a high security and also has the following. Fiber optic cables have a much greater bandwidth than metal cables. This means that they can carry more data. Â  Fiber optic cables are less susceptible than metal cables to interference. Fiber optic cables are much thinner and lighter than metal wires. Data can be transmitted digitally (the natural form for computer data) rather than analogically. Identify the alternative forms of communication media and provide examples of their use in different forms of network. Microwave Microwave frequencies require a direct line of sight between sending and receiving station to operate. Microwave systems were the preferred method of communications transmission before the introduction of fiber optic. Radio The lowest-frequency domain that needed to name. This extends from wavelengths of a kilometre or so, the longest that will propagate through the interstellar medium, down to about a millimetre. The detection of radio radiation is often done using wave techniques rather than photon-counting, this is because of the low photon energies, and this offers distinct advantages for such applications as interferometer which astronomers working in the infrared and optical regimes view with some envy. From active nuclei, we often detect the synchrotron radiation in this range radiation produced energetic charged particles (mostly electrons) produce when they are deflected by the magnetic fields. a) Define the basic signal theory with the aid of diagrams? 1) In electronics, a signal is an electric current or electromagnetic field that is used to convey data from one place to another. The simplest form of signal is a direct current (DC) that is switched on and off; this is the principle by which the early telegraph worked. More complex signals consist of an alternating-current (AC) or electromagnetic carrier that contains one or more data streams. Data is superimposed on a carrier current or a wave this is by means of a process called a modulation. Signal modulation can be done by two main ways: analogue and digital. In recent years, digital modulation has been getting more common, while analogue modulation methods have been used less and less. There are still plenty of analogue signals around, however, and they will probably never become totally extinct. Except for DC signals such as telegraph and base band, all signal carriers have a definable frequency or frequencies. Signals also have a property called wavelength, which is inversely proportional to the frequency. 2) In some information technology contexts, a signal are simply that which is sent or received, thus including both the carrier and the data together. 3) In telephony, a signal has a special data that is used to set up or control communication. Almost everything in the world can be described or represented in one of two forms: analogue or digital. The principal feature of analogue representations is that they are continuous. In contrast, digital representations consist of values measured at discrete intervals. Digital watches are called digital because they go from one value to the next without displaying all intermediate values. Consequently, they can display only a finite number of times of the day. In contrast, watches with hands are analogue, this is mainly because the hands move continuously around the clock face. As the minute hand goes around, it not only touches the numbers 1 through 12, but also the infinite number of points in between. Early attempts at building computers used analogue techniques, but the accuracy and reliability were not good enough. Today, almost all computers are digital. Analogue and Digital Technology Analogue and Digital are the words we hear when people talk about Communication and Information Technology. What do the words Analogue and Digital mean? Analogy means a likeness between two things that are really quite different. For example the analogy between the brain and the computer or the heart and a pump. Digit means either a finger or toe, or one of the numbers 1 to 9. Some examples might help to explain what analogue and digital mean in technology. A simple example of analogue and digital technology Clocks are examples of analogue and digital technology. An analogue clock face can display the time without numbers. The hands keep moving all the time and they continue to rotate, just like the earth around the sun. This is the analogy between the movement of the sun and earth, and the hands of the clock. The digital clock displays the time in numbers, and the time displayed only changes at each minute. In the analogue clock the hands keep moving all the time, while the digital clock is more like an on and off movement. Each minutes the time moves and then stops for another 60 seconds, when it changes again. Some other examples of displaying information using analogue and digital forms. b) How the signal theory affects the choice of transmission methods and media? Analogue and Digital Signals Sound can be converted into analogue and digital electrical signals. Analogue Signal A microphone or handset of a telephone will convert sound into an analogue signal. The shape of the wave seen on an oscilloscope represents the volume and pitch. The diagram is shown below: This is called an analogue signal because, when the volume and pitch change, so does the shape of the wave. The signal is an analogue of the sound. Digital signal Today we see many sound systems described as digital. This means the sound is converted into digital signals so it can be transmitted or recorded. In the microphone example shown on the diagram above, the analogue signal is converted into a digital signal by electronic circuits. In a digital signal the electricity, this can be either on or off, is combined with a binary code. The voltage of the analogue signal is measured electronically, many thousands of times per second, by an analogue-digital converter. The analogue signal is converted into a 16 bit binary number, which gives 65,536 levels of voltage. In electronics 1 = ON and 0 = OFF. This means the binary number can be converted into an electrical signal. A diagram below shows the process of converting analogue signals into a binary numbers and digital signals. To keep the explanation simple the analogue signal has been converted into a 3 bit binary number, which means there are seven voltage levels. A digital-analogue converter reverses the conversion this is because the speakers (output device) need an analogue signal. Light and sound can be converted into binary numbers and digital signals that are used to record and transmit information. This diagram is shown below: Why are digital systems better than the analogue ones? An analogue signal is affected by changes in the voltage as it travels along a wire. If the voltage changes, so does the signal at the output. The digital signal is not affected by changes in the voltage this is because all that matters is whether it is ON or OFF. How signal affects transmission methods? Noise is any sound on the CD or record that wasnt there at the performance during the recording session. More generally, it is any unwanted signal that adds on to the information that is being transmitted. When a vinyl record is being made, noise is introduced at every step of the recording process, although of course the company makes an every effort to reduce such noise to as low a level as possible. The sound that reaches the microphones is converted into an electrical signal that is then recorded on a wide magnetic tape moving at high speed. This tape is then used to control the cutting of a master disc, from which moulds are then made. These in turn are used to mass-produce the records that are eventually sold in shops. Noise is produced at every step, not forgetting that introduced by your own stereo equipment. It can never be entirely eliminated. The same problems of noise are shared by any method of transmitting information, and are certainly by telecommunications, including telephone calls. In the production of vinyl records, the companies have used purely analogue this means to transfer the information representing the sound of the music from one point to another. That means they use an electrical signal that changes smoothly in strength, exactly modelling the smooth but complex changes in the sound. When a noise is created in the recording process because of tape hiss, dust on the master disc, electrical interference or any other cause this is added on as a random signal on top of the complex electrical signal representing the sound. There is no way that electronic equipment can tell such random noise from the original electrical signal, so there is no way it can be removed again without removing some of the original signal. We can see more clearly if we draw a graph of the level of the analogue audio signal over a period of time (diagram 1a). The shape of this graph represents both the changes in the electrical sound and the changes in the electrical signal that model it. Now if we add to this audio signal some random noise, this affects the shape of the signal, and this degrades the sound that your stereo reproduces (diagram 1b). The trouble with an analogue audio signal is that its exact shape has to be preserved if you are to hear the music exactly as it was when it was played. If there were a means of transmitting the signal so that only the overall shape of the signal mattered, then noise would not be so important. The port authorities used to find the shape of the bottom of the harbour, so that ships could navigate more safely. It certainly wasnt possible to drain the harbour and take a photograph of it, so what they did instead was send out a boat which travelled slowly across the harbour. Every few meters a person at the back of the boat dropped down a plumb-line (a weight at the end of a rope), until it reached the bottom of the harbour. The line had knots tied in it at regular spaces and the person called out the number of knots under water, so indicating the depth of the harbour at that point. A clerk wrote these down, and eventually it was possible for him to draw a graph of the shape of the harbour by using these numbers. The person in the boat had been taking samples of the depth of the harbour at frequent intervals, so that the graph would accurately describe the ups and downs of the harbour bottom.

Lifestyles Fitness Center :: Business Marketing Management Essays

Executive Summary In 1995, Lifestyles Fitness Center was formed to provide a full service fitness center to provide for all segments of the populace in Lifestyles Fitness and the surrounding area. Although there is an existing work out center in Lifestyles Fitness, the existing facility does not provide the support for the senior members of the community. Our mission is to provide a center that will provide not only an area for dedicated weight lifters, but also for the person seeking to maintain fitness. We want to provide a center that supports aerobic, cardiovascular, and weight training for all segments of the community. The ability of Lifestyles Fitness to provide both an indoor track combined with certified training is a capability unique to private fitness centers in this area. The center will also provide showers and changing rooms for their clients to use. The center will also provide workout apparel for each individual (if preferred). This service will expand the marketability of Lifestyles Fitness. We have also added to our existing services. We have developed plans to introduce a health and protein drink bar and provide exotic coffees for customers. In addition, we also offer a nutritionalist and a cafeteria. It is considered that this will also provide an area that the cliental can cool down, relax and get the proper nutrition after a work out. This will also provide additional income for the center. Management Our management team consists of persons with a broad background in both the fitness area and business management, and it is fully supported by the Institute for Entrepreneurial Studies and Development and Small Business Development Center at Colorado State University. The management staff consist of Old McDonald CEO and supervisor of training, Dad McDonald director of Marketing, Dad McDonald III assistant director of facilities, and Mom McDonald Vice president. Old has a broad background in the fitness training industry, currently carrying a training certification from the AAIA/ISMA. He is currently working on a degree in business with emphasis on the fitness industry. He has held several different titles in both track and field and football. In high school he was selected as All-American Football Linemen, was All-State his junior and senior years in track and his senior year in football, and was All-Conference his freshmen year in college. Dad has a BS, MS, and EdS degree, and is currently working on specialized training in industrial marketing.

Marie Curie: Radioactivity and X rays Essay

Marie Curie was born Marie Sklodowska on November 7th, 1867. She was born in Warsaw, Poland (â€Å"Marie Curie – Biography† par 1). Curie received her education from local schools; but her knowledge of science from her father. She obtained â€Å"Licentiateships in Physics and the Mathematical Sciences† from Sorbonne University, in Paris (â€Å"Marie Curie – Biography† par 1). Curie also received her Doctor of Science degree at Sorbonne as well. Marie Curie married Professor Pierre Curie after meeting him during university. The two wed within the year that they met. (â€Å"Marie Curie – Biography† par 1). Marie Curie, with the help of her husband Pierre Curie, and with past discoveries of Antoine Becquerel, discovered radioactivity, which explained the creation of the x ray. It first started off with Antoine Becquerel, a French physicist. â€Å"Becquerel was familiar with the work of Wilhelm Conrad Roentgen,† which were the photographs that Roentgen had taken (Peters and Slowiczek par 3). These photographs were unique in their kind. One of the photographs that were taken was one of his wife’s hands, complete with her ring. This photo showed the skeletal structure of her hand, and the ring that was placed on top (Peters and Slowiczek par 4). Roentgen’s wife placed her hand in the path of x rays, which Roentgen created himself. He created x rays â€Å"by beaming an electron ray energy source onto a cathode tube.† (Peters and Slowiczek par 4). These â€Å"photographs† intrigued Becquerel, inducing him to research the phenomena of florescence and phosphorescence. In March of 1896, he discovered that florescence and phosphorescence were similar to each other; as well as to x rays, but there is also an important difference. The difference between the three was florescence and x rays stopped, when the starting energy force was halted; but the phosphorescence continued (Peters and Slowiczek par 5). A similarity between the three was the energy was initially derived from an outside source (Peters and Slowiczek par 5). Becquerel tried to harness the sun’s energy; making it the initial source of energy for the different rays, but that was not possible. Source: National Health Museum He put his wrapped photographic plates away in a darkened drawer, along with some crystals containing uranium. Much to his Becquerel’s surprise, the plates were exposed during storage by invisible emanations from the uranium. The emanations did not require the presence of an initiating energy source–the crystals emitted rays on their own! Although Becquerel did not pursue his discovery of radioactivity, others did and, in so doing, changed the face of both modern medicine and modern science. (Peters and Slowiczek par 6). Following up on Becquerel’s research; the Curies, Marie and Pierre, begun a life commitment to radioactivity research. Marie Curie stated that â€Å"The subject seemed to us very attractive and all the more so because the question was entirely new and nothing yet had been written upon it.† when it came to radioactivity (Peters and Slowickez par 7). The Curies used Becquerel’s note on how air could be a conductor of electricity because of uranium, as well as using sensitive instruments created by Pierre and his brother. On February 17, 1898, an ore of uranium, pitchblende, was tested by the Curies. Time and time again, the result was that the pitchblende created a current 300 times stronger than pure uranium. The Curies thus came up with the conclusion that an active unknown substance, as well as the uranium, still exists in the pitchblende (Peters and Slowickez par 8). The â€Å"hypothesized† element was named polonium, in honour of Curie’s native land, Poland; they labelled this element â€Å"radio-active,† as well as introducing this term. The Curies were able to extort enough polonium and radium, which is another radioactive element, establishing the chemical elements of both. Marie Curie worked alongside Pierre, â€Å"to establish the first quantitative standards by which the rate of radioactive emission of charged particles from elements could be measured and compared† even after her husband died (Peters and Slowickez par 9). Curie also managed to discover that there was a decrease in the radioactivity, and it could be predicted, since can be calculated; as well as the realization of which radiation is atomic property of matter, rather than a separate independent emanation (Peters and Slowickez par 9). The scientific discovery of x rays and radioactivity addressed global issues. The global issue that mainly x rays addressed is health care. X rays affected, and still effects health care because of what it was designed to do. This helps doctors determine many things, such as broken bones, tooth decay, and anything relating to the bone structure of someone, or animal. Radioactivity helped humans in a couple of ways as well. There are a couple of uses for radioactivity today. One of the uses is to create nuclear energy, which in the end is used to create electricity. Another use for radioactive materials is radiation. Radiation is used to treat cancer patients; in hope of killing the source of cancerous cells, and removing the cancer from someone’s body. The discovery of x rays and radioactivity did indeed help solve a problem; and benefited the global community. One problem that radioactivity solved was an energy issue. Radioactivity provided scientists with a new method of energy that was more environmentally friendly than combusting petroleum. This method is nuclear power plants. Nuclear power plants harness the energy that is released from a type of uranium or U-235 (â€Å"EIA Energy Kids – Uranium (nuclear).† par 5). X rays have benefited mankind in the world of medicine, as well as safety. X rays are now available in hospitals. X rays can check for broken bones, fractures, tooth decay, and other bone related issues. X rays are not only used in hospitals. Airports around the world use x rays to check baggage over; making sure that there are no dangerous weapons stored in luggage; or any illegal drugs; etc. (Eaton par 3). Source: Fast Company For every invention or discovery, there are advantages and limitations. The advantages of x rays and radioactivity are numerous. X rays can detect bone damage, artery damage and supply airports with safety measures. Radioactivity is used to harness the energy of U-235 to create nuclear power for a source of electricity, as well as radiation treatments. The limitations of x rays and radioactivity include raise the risk of cancer infecting the body, damaging the cells, causing cell mutations, birth defects, among other things as well (â€Å"Pros and Cons of X-rays† par 2). Scientists’ contributions have improved some aspects of society. One aspect of society would be politically. X rays are now being used in airports to check baggage for any weaponry; or anything that could be made into an explosive. All of these measures are being taken due to the terrorist bombing of September 11, 2001. Security measures have tightened up since then, and are becoming stricter ever since, since there are increasing amounts of terrorist threats to hijack planes, or bomb planes (Eaton par 7). Another contribution that is effected is social aspects. X rays and radioactivity affect people’s health in numerous ways. They can either help damage a person’s health, or help correct. Radioactivity can cause mutations, birth defects, and many other problem, while an x ray can help correct a broken bone, or decaying tooth by showing the area of damage, so doctors can take proper procedures. Works Cited Eaton, Kit. â€Å"Full-Body Scanners at Airports: The Good, the Bad, and the Ugly | Fast Company.† FastCompany.com – Where Ideas and People Meet | Fast Company. Fast Company, 30 Dec. 2009. Web. 17 May 2010. . â€Å"EIA Energy Kids – Uranium (nuclear).† Energy Information Administration – EIA – Official Energy Statistics from the U.S. Government. Energy Information Administration. Web. 16 May 2010. . â€Å"Marie Curie – Biography.† Nobelprize.org. Nobel Prize. Web. 14 May 2010. . Peters, Pamela M., and Fran Slowiczek. â€Å"The Discovery Of Radioactivity: The Dawn of the Nuclear Age.† Access Excellence @ the National Health Museum. National Health Museum. Web. 15 May 2010. . â€Å"Pros and Cons of X-rays.† The Brunei Times. 4 Dec. 2007. Web. 17 May 2010. .

Communism And Its Effects On America s Freedom And...

During the 1950’s, Communism was a major fear that Democratic nations such as America were afraid of because of its radical ideas. The actions taken due to the Red Scare and the rise of McCarthyism were necessary and completely justified to protect America’s freedom and government from Communist power. With an increase of Communistic nations invading other countries and forcing their ideas upon them there was an uproar of fear in the United States. The Domino Theory was a legitimate fear of if one nation falling to communism, every nation around it would fall as well. Focusing their attention to VIetnam especially, America increased military control in these regions. Multiple Legislative actions taken by the United States such as the creation of the HAUC and the Espionage and Sedition acts were necessary to stop threats to America’s freedom. The heated tensions between the Soviet Union and the United States during the Cold War contributed to the fear of an attac k from the East. Senator McCarthy’s convincing accusations lead to many accurate accusations as well as the rise of McCarthyism. Valid points were brought up about president Roosevelt’s New Deal policies of having capitalistic characteristics. While some actions did take away the civil liberties of some Americans, and were not always accurate, they were necessary to protect American Democracy, as well as the safety of the citizens. The Red Scare of the fifties was a very controversial time in American history. TheShow MoreRelatedCommunism : An Intriguing Theory899 Words   |  4 PagesCommunism could be an intriguing theory, especially to a poor developing country. A society where not one person is superior to another, where everyone shares products of their labor, and where the government provides for their people by providing employment and medical care for all. 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Each and every person ripped their hearts out and slapped it on their shirts and America became a front for freedom fighting. People fought for gay and lesbian rights, civil rights, women’s rights, reformation of standard narrative values, and sexual exploration. People wanted to be delivered and they battled for a new avenue of expression and liberty. Though they yearned for this, there was oneRead MoreEffect On American Society During The Cold War1183 Words   |  5 PagesThe Effect on American Society During the Cold War The Cold War propelled the United States of America into a seat of previously unattained power in the world . American citizens spearheaded the push toward advancement in their search for the epitome of happiness: the â€Å"American Dream†. Post-war paranoia was driven by the supposed threat of the spread of communism, which Americans feared could interfere with the freedoms and liberties the founding fathers fought to achieve. 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Truman believes that industrialization and democracy in Germany and throughout the world would ensure postwar stability. Stalin also wanted to spread communism throughout the country so Truman came up with Containment Policy in order to stop the spread of communism. Their different ideologies caused themRead MoreThe United States Involvement During The Vietnam War1729 Words   |  7 PagesThe war was fought between the communist Northern Vietnamese and the anti-communist Southern Vietnamese after the country was temporarily divided by the Geneva Accords. Americas entering of the Vietnam War proved to be an extremely controversial decision due to citizens belief that the United States reasons for intervention were unnecessary nor justified, and young teens were mainly drafted under the Selective Service Act. The death toll of nearly 3,595,000 people from the war was the re sult of years