Digital Comm Tutorial Free Essays

string(29) " stability of 1 part in 107\." The process of quantisation introduces an error or noise component into the quantised signal. Derive an equation for the mean-squared quantisation error in terms of the quantization interval ‘a’. ii) Hence show that the peak signal-to-quantisation noise ratio (SQNR) is SQNR = ( 6n + 4. We will write a custom essay sample on Digital Comm Tutorial or any similar topic only for you Order Now 8 ) dB Where 2 n is the number of quantisation levels. b)i) Linear quantisation is used prior to binary PCM encoding of an analogue baseband signal which has a uniform probability density function. The signal-to-quantisation noise ratio must be no less than 35 dB. How many binary bits are required to code each quansation level? ii) If the bit rate is 104 bits per second, what should be the maximum bandwidth of the analogue signal prior to sampling? Q2. a)i) Explain how nonlinear quantisation can be used to reduce the number of levels required to quantise a signal. ii) Explain why logarithmic quantisation is preferred. iii) What types of signal is most suitable to be processed by non-linear quantisation? b) Sketch the A-law companding curved. Explain why companding is used in voice transmission systems. c) Show that the dynamic range of the logarithmic portion of the A-law compander is 38. dB and that the improvement in signal to quantisation noise ratio realized for small signals, compared with linear quantisation , is 24 dB. d) For an 8-bit A-law companded PCM system, calculate the SQNR obtainable and the PCM bit rate. Assume the sampling frequency is 8 KHz. Q3. a) Explain (qualitatively) how Differential Pulse Code Modulation (DPCM) can reduce the transmission bandwidth required. b) Explain what is delta modulation. Why it is particularly suited to speech signals? c) For an input sinusoid of frequency 1 kHz, estimate and compare the signal-to-error ratios of a linear PCM coder using a sampling rate of 2. kHz and 7 bits per sample quantisation with a single-integration delta modulator producing the same gross bit rate. BASEBAND REGERATOR / ERROR PROBABILITY / LINE CODE Q4. a) Digital transmission systems provide better received signal quality compare to analogue transmission systems when implementing a long distance communication link. Explain briefly why this is so. b) A PCM transmission link employed 8 bit coding and uses baseband regenerator as repeater. Determine the Signal-to-Noise ratio obtainable at the receiver assuming no bit error occurred. c) An analogue transmission system required amplifiers to be spaced every 2 km apart. Assume the Signal-to-Noise ratio of the amplifier is 65 dB, determine the maximum distance of the link before the quality of the received signal is lower than the PCM link above. d) A RF binary PSK system operates with phase states separated by 180o. The bit rate is 2. 0 Mbit/s and the noise power spectral density at the input to an ideal matched filter detector is 1. 0 pW/Hz. If the transmission loss between transmitter and detector is 40 dB, what power must be transmitted to achieve a probability of bit error of 1( 10-6 ? For binary PSK , Pe = ? [1- erf(Eb/No)1/2] Error function tables are provided. Q5. ) Draw a simplified block diagram of a PCM regenerative repeater. b) An ideal 18 – section, copper cable, PCM link employs unipolar , NRZ, rectangular pulses on each section and a center point detection process at each repeater. The probability of error versus SNR for this transmission and detection scheme is given by [pic] If all sections were identical, and operated with a section SNR of precisely 18 dB, what would be the overall probability of error for the entire link? Q6. (a) Sketch the typical, long term, spectrum of a speech waveform. Show on your sketch the bandwidth normally considered sufficient for telephone quality transmission. b) i) If the voice signal in part (a) is to be transmitted using 8-bit PCM and use the bandwidth upper frequency limit shown on your sketch to find the required PCM bit rate. ii) What channel bandwidth, in principle, would be required if the PCM bits were to be transmitted as perfectly rectangular pulses without distortions? iii) What is the minimum theoretical bandwidth which would allow the PCM bits to be transmitted independently (i. e. without inter-symbol interference (ISI) at the receiver sampling instants)? Explain your answer. (c) i) What is the main functions of line codes? i) The bit stream shown in Fig. Q7 is to be line-coded using the high-density substitutiontechnique HDB3. Sketch a version of the resulting coded signal. What are the features of HDB3 which makes it an attractive line code? [pic] Fig. Q6 TDM / PDH / SDH Q7. a)i) Describe, with the aid of a diagram, the way in which analogue telephone channels plus signalling and service information are combined in a plesiochronous time-division multiplexed system to form the primary multiplex group. ii) What sampling rate would be appropriate for each telephone channel and what would be the gross bit rate of the multiplex group? )i) Show how primary multiplex groups may be combined to form higher level multiplexes and to provide access for wideband signals. ii) Explain why it is necessary in a high order Plesiochronous digital hierarchy (PDH ) to de-multiplex down to the lowest order whenever a single channel is to be extracted or inserted. c) Calculate the number of telephone channels which can be accommodated at level 4 of a PDH. d) In the PDH, explain why the bit rate at a given level is not exactly an integer multiple of the bit rate at the level below. Q8. a) Explain why bit justification is required in a PDH network, and describe how it may be performed. ) i) Determine the minimum and maximum input channel rates accommodated by an CEPT2 multiplexer. ii) Determine the rate of CEPT1 misframes caused by erroneous interpretation of a stuffed bit. Assume channel bit error rate Pe is 10-6. CEPT2 parameters: Bit rate8. 448 Mbit/s Master frame length848 bits Message length/channel205 bits Framing bits12 bits Stuffing control bits12 bits Stuff bits4 bits c)i) Explain what is frame slip. ii) In a PDH network, the primary multiplex clock generators have frequency stability of 1 part in 107. You read "Digital Comm Tutorial" in category "Papers" Calculate the average number of frames slips per hours in a connection of 5 inter- exchange links. Q9. a) Describe the essential features of the Plesiochronous Digital Hierarchy (PDH). b) Plesiochronous networks have a number of disadvantages by comparisons with the Synchronous Digital Hierarchy. State and explain two of them. c) Draw a block diagram illustrating the SDH. Show on your diagram the nominal STMbit rates associated with each SDH level. d)i) Describe the SDH primary-rate frame structure with particular reference to the location within the frame of the section overheads, the (administrative unit) pointers and the STM-1 payload. ii) What are the main functions of pointer? SIGNALLING Q10. a)i) Explain the need for signaling in a telecommunication system. ii) List the minimum basic signaling requirements, and show how they may be obtained in the subscriber loop of a typical telephone network. b) Draw a simple block diagram illustrating the essential difference between channel-associated signaling (CAS) and common channel signaling (CCS). c) List the advantages of CCS over CAS. d) Modern digital switching systems using Stored Program Control (SPC) employ CCS. Draw a block diagram showing how CCS may be implemented. e) What is the disadvantage of CCS and how are they overcome? Q11. ) Show how the ITU-T (formerly CCITT ) signaling systems No. 7 conform to theInternational Standard Organisation, Open Systems Interconnection (ISO-OSI ) model. b) What are the three types of signal units employ by the ITU-T SS No. 7? What is the function of each? c)i) How is the channel associated signaling handled by the 30+2 PCM primary multiplex frame? ii) Calculate the bit rate of th e signaling channel with one voice channel. TELETRAFFIC THEORY Q12. a) In a switching system for which blocked calls are lost, the average number of calls per hour is 200 with an average holding time of 3 minutes. Estimate the number of trunks required to achieve a grade of service of 0. 1 %. b) On the average during the busy hour, traffic generated in exchange A and exchange B is shown in table Q13. Assume no tandem traffic, estimate the number of trunk channels (two way connections) required for a grade service of 1 %: i) if the same lines are used for incoming and outgoing calls, ii) if separate lines are used for incoming and outgoing calls. Evaluate the above options and propose a cost effective solution. What is the minimum number of trunk lines required to serve the two exchanges? |Exchange A |Exchange B | |Exchange A |- |36 Erlang | |Exchange B |43 Erlang |- | Table Q13 c) Calculate the number of channels needed in a seven-cell re-use pattern cellular systems to achieve a blocking probability of 1 % if there are 2800 calls per cell per hour, each of average duration of 1. 8 minutes. (use traffic table). Q13. a) Define traffic intensity and congestion. ) Explain why it is necessary to determine the traffic variations as a function of time for a telephone exchange. c)For a telephone exchange designed based on blocked call lost assumption, the probability of there being k calls in progress with N trunks carrying traffic A Erlang is given by: [pic][pic] i) Explain what is meant by blocked call lost. Give an evaluation the effect of this assumption. ii) Derive an equation for the probability all servers are busy and the subscriber encountered call blocking. State the assumptions made for the above equation to be valid. ) A PBX with 250 internal lines has 10 trunks to the public network. i) What is the probability of call blocking if each internal line is involved in four external calls with an average duration of 2. 5 minutes per call, per eight-hour working day? ii) How many additional trunk connections would be required to improve the grade-of service to better than 0. 5 %? Q14. a) In a que ueing system, the average rate of packet transmission is ( frames per second, and the average arrival rate of data is ( packets per second. The probability that therewill be n packets in the queue is Pn = (1 – ( )( ( ) nwhere ( = ( / ( b) Derive an equation for the average number of packets in the queue and show how this varies with the parameter ( . c) How would you use this equation to design the node in a packet-switched system? d) If the switching node has a transmission capacity of 800 packets per second and the packet arrival rate is 500 packets per second. i) Calculate the average number of packets in the queue and hence ii) Calculate the average waiting time per packet. iii) What is the mean delay introduced by the switching node on a packet? ) A common –channel signalling system uses a 64 kbits/s data link to serve a group of 1500 speech circuits on a route between two exchanges. The busy-hour traffic is 1000 E and the average call duration is two minutes. On average each call requires transmission of ten messages (five signals plus five responses) and the average message length is 20 octets. Calculate the percentage of messages which encounter delay and the mean delay for these messages. DATA COMMUNICATION NETWORK Q15. a)i) Describe the principle of data communication by packet switching. ii) Evaluate the advantages of this strategy by comparison with circuit switching. )Show how the format of a packet can allow inclusion of routing, error correction, synchronisation and data. c)A packet switch has a single outgoing link at 2. 048 Mbit/s. The average length of each packet is 960 bytes. If the average packet delay through the switch must be less than 20 ms, assuming an M/M/1 queue, determine the i) maximum total packet arrival rate ii) average length of the queue. Q16a) Outline the ISO-OSI data communication network model. b) i) At which layer of the ISO-OSI model does the routing information provided? ii) Name and describe briefly two common routing protocols for the Wide Area Network (WAN). ii) Compare the relative performance of the protocols. iv) give an example of the connection standard applicable to each. c) Describe the format of a High-level Data Link Control (HDLC) packet and describe how this could be employed to implement call set-up, data transfer and call clearing in a virtual circuit. ISDN / B-ISDN Q17. a) Most national tele-traffic networks have evolved from systems using analogue telephonyand signaling and electromechanical switching. Show, using diagrams, how it has been possible to develop Integrated Digital Networks (IDN) whilst retaining much of the transmission network. ) An IDN is required to provide communication of information in addition to digital telephony signals. Describe the others signals necessary to operate an IDN and show how these can be integrated within a single network. c) Outline the potential benefits of an ISDN. d) Describe the data handling capabilities of Basic Rate Access and Primary Rate Access ISDN services. What are the gros s bit rates in each case? Q18. a) Describe the process which takes place in a packet speech transmission system and outline the transmission delay which might be expected. ) In a packet communication network packets arrive at a switch according to a Poisson distribution with a mean arrival rate of 4 packet/s. The service time is exponentially distributed with a mean value of 100 ms. Assuming that each packet contains 70 bytes and the output transmission rate is 5. 6 kbit/s. How long, on average, does a packet have to wait in the queue? If the switch in part (c) is limited in length to 10 packets, what is the probability of losing packets? c) What extensions to these access processes will be required to handle multi-media terminals and what data transfer method will be most appropriate? ) What are the numerical values of the following: i) ATM cell size. ii) ATM information field size. iii) SDH STM-1 bit rate. iv) PCM voice channel bit rate. e) Use your answer in part (d) to find the expected total network delay (including packetisation delay) experienced by a voice signal transmitted over an ATM network connection operating at the SDH STM-1 bit rate. The connection traverse 8 switching centers, each of which introduces a mean delay equal to 98 ATM cells. The transmission path length is 350 km in total, and the specific delay of the transmission medium is 5 (s/km. How to cite Digital Comm Tutorial, Papers

Differentiating Between Market Structures free essay sample

Differentiating Between Market Structures Alana Campbell, Dale Fortune, Katrina Beyah, Leonard Cooper University of Phoenix ECO/212 Principles of Economics Donnetta McAdoo December 5, 2011 Differentiating Between Market Structures To understand the economy of today one must understand the different market structures that make up the economy. There are four market structures that define the economic structure within the world’s economy; perfect competition, monopoly, monopolistic competition, and oligopoly. Team A will provide example of each market structure by completing a market structure table. The members of Team A will also compare and contrast the differences between public goods, private goods, common resources, and natural monopolies. Another portion of the paper will discuss how supply of labor and demand of labor affect labor equilibrium within the market. Team A selected Wal-Mart as the familiar organizational market structure to review, identify, and evaluate. Team A will also provide the factors that affect Wal-Mart’s labor supply and demand. Compare and Contrast To compare and contrast both public and private goods used within the Wal-Mart Corporation, differentiations help identify structures by which the company competes and profits. A public good is both non-rivalrous and non-excludable. Public goods are often although not always, supplied by a government rather than by private firms (p. 148). Classic examples of public goods include national defense and court systems. Conversely, goods both rival (competitive) and excludable (unique) define private goods (e. g. , food, clothing, haircuts, etc. ). In an economic business environment, Wal-Mart provides products and services to private sector consumers to generate profit. Watkins (2100), â€Å"Private goods are such that if one person receives more of them then necessarily there will be less for the other people. In contrast, public goods are those things that all people can simultaneously benefit from† (Nature of Public Goods). By definition a public good is one non-rival and non-excludable. Competing with rival competitors and guided by customer demands; public goods and private goods do not interrelate, but contrast by nature. Although Wal-Mart uses natural resources (e. g. , oil, gas, and water) that may equate to higher expenses, the prices on marketable products sold correlate to consumer demands, consumption, and competition. Common resources (e. g. , electricity, and natural gas) refined and sold through non-rival (non-direct) competitors provide adequate supplies to Wal-Mart facilities without diminishing, or reducing utility supplies to other entities. The goods that are non-rival but excludable involve a natural monopoly. According to  Auburn university  (2005), â€Å"Theoretically, natural monopoly arises when there are very large economies of scale relative to the existing demand for the industrys product, so that the larger the quantity of the good a single factory produces, the cheaper the average costs per unit get right up to production at a level more than sufficient to supply the entire demand in the relevant market area† (Natural monopoly). How Labor Market Equilibrium is Affected by Supply and Demand of Labor Labor equilibrium is the complete balance between the supply of labor and the demand of labor. Companies like Wal-Mart that sell and provide goods and services in the market of supply and demand are part of a buyers’ market in the labor market. When the market supply and demand are in a state of balance to one another and prices become stable it is considered to have reached a state of equilibrium. The labor equilibrium is affected by the supply and demand of labor if the supply of labor is greater than the demand of labor. The demand for labor is determined by the conduct of profit maximizing firms and how the marginal revenue product curve shifts to describe the amount of revenue added by each additional worker Wal-Mart hires. A demand labor curve shifts when there are changes in the price of good or service that a firm like Wal-Mart sells, and by changes in labor productivity for example, the introduction of new electronics. The supply curve for labor represents the behavior of the individual and the decision of how much labor to supply for a given wage, labor supply curve shifts if the individuals’ preferences for work over leisure change as most individuals tend to tradeoff between labor and leisure. Wal-Mart needs workers to sell, package, and distribute the products sold from its stores. References: Scherer, Frederic M., and David Ross. Industrial market structure and economic performance. (1990). Leland, Hayne E., and David H. Pyle. Informational asymmetries, financial structure, and financial intermediation. The journal of Finance 32.2 (1977): 371-387. Smith, Wendell R. Product differentiation and market segmentation as alternative marketing strategies. The Journal of Marketing (1956): 3-8. Ettlie, John E., William P. Bridges, and Robert D. Okeefe. Organization strategy and structural differences for radical versus incremental innovation. Management science 30.6 (1984): 682-695. Hagedoorn, John. Understanding the rationale of strategic technology partnering: Nterorganizational modes of cooperation and sectoral differences. Strategic management journal 14.5 (1993): 371-385. Christensen, H. Kurt, and Cynthia A. Montgomery. Corporate economic performance: Diversification strategy versus market structure. Strategic Management Journal 2.4 (1981): 327-343.

The Shadow of the Wind Review Essay Example

The Shadow of the Wind Review Paper Essay on The Shadow of the Wind  «This world will disappear not by the atomic bomb, as they say in the newspapers, he would die of laughter, banal jokes and habits to turn everything into an anecdote, and vulgar ». die if people stop reading and important to write books such as The Shadow of the wind Carlos Ruiz Safonov. This is an amazing book, which drown on the first page and do not want to break out of the words of viscosity. Inhale cold air burns the lungs and for a moment sober mind. And then again plunge into the passionate Spanish voice behind the veil of secrets In the novel, starting with mysticism and cloudy sky Morning Barcelona, ​​intertwined reality and fiction -. Crazy, full of fear and love fiction heroes in the same extent that the Italians seem to us impulsive, extravagant lover of life, the Spaniards in the Shadows of the wind again on the verge of madness go hand in hand with death we love them -. ash shade and sensuality covered with a lace mantilla mourning. In this book, the air is hot even winter air and full of unspoken thoughts and stories buried. They are repeated in the new destinies. To the pages to the story, to the heroes themselves relentlessly approaching fire. A spellbound reader with fear should be the author, preparing to see glow corners of paper We will write a custom essay sample on The Shadow of the Wind Review specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on The Shadow of the Wind Review specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on The Shadow of the Wind Review specifically for you FOR ONLY $16.38 $13.9/page Hire Writer .  «Books they are like mirrors: they only reflect whats in your soul » In. hands of young Daniel gets strange book perhaps the only instance of the wind shadow of a Julian Carax. It fascinates boys and forever change his life. From now on, it pursues the shadow of a man without a face who wants to destroy the novel, and the ghosts of the past, hiding the story of Julian Carax. More and more yarn tangle of secrets tightened around Daniel, and the light that he can not yet to understand that there is, without which he can not find a way -. it Bea  «time runs faster when it is filled with emptiness » The heads dare each other.. The narrative rushes along the streets of Barcelona, ​​for long breaks in the attic in Paris and returns to Spain. Mystic merges with everyday life, death comes on the heels, strange pain is haunted by Daniel. It spurs it makes act and become a man capable of love  « the one who loves true love love in silence, deeds rather than words ». Step-by-step. faster boy coming to the truth. At first, stumbling, but still confident he looks into the eyes of fire. And the fire recedes If the first half of the book represents death, the second -. There is nothing but life. The wind changes direction and heads back to the present and back in time to connect the broken mosaic of life Julià ¡n Carax.  «Stop nervous, give yourself a rest from waiting soul rust ». rest comes with the morning, which the heroes waiting for many years. In the morning, when the memory will allow the fire to take his due it will leave a few illusions that help again and again to look ahead and make even the smallest happiness .

Phone Tapping Essays

Phone Tapping Essays Phone Tapping Paper Phone Tapping Paper A Characteristic of Orwell’s Big Brother? Communication makes the world what it is. Without communication, people would virtually be in total isolation from one another and with events around the world. Telephones play an integral role in providing this much-needed communication. Telephones also permit people the freedom to say what they wish to others on a confidential basis, without any risk of witnesses. This freedom allows releases that many people believe no one can take away. Most people take this freedom for granted and overlook the fact that the government can, under certain restricted conditions, take it away by phone tapping. Phone tapping is the secret monitoring of a conversation by a third party. Where some may argue that phone tapping is necessary, that argument is misleading and incorrect in many aspects. Many argue that phone tapping is an invasion of privacy. Nowhere in the Constitution is the word privacy mentioned, implying that, â€Å"Privacy is a value or ideal in society,† (McCloskey) but not a right. This is one argument in support of phone tapping. While some claim that the Constitution supports this argument, sections of the Constitution actually provide reasons why this argument is incorrect (Browne). Those guidelines imply that Americans have the right to privacy, because there would be no point for laws to protect privacy if privacy was not a right. However, the Bill of Rights does not explicitly say the word privacy but it implies and defends privacy within multiple amendments including the Fourth and the Tenth. The Fourth Amendment clearly states, â€Å"Without probable cause and a search warrant, the government cannot search or seize your house or belongings. † (United States Constitution. ). The right to not to have one’s personal property and belongings searched, is a guideline that defines privacy. The Tenth Amendment states, â€Å"The powers not delegated to the United States by the Constitution, nor prohibited by it to the states, are reserved to the states, or to the people. † (United States Constitution. ). This means the government has no power or right to invade our privacy or do anything that it not specifically sanctioned in the Constitution (Browne). Therefore, concerning the invasion of privacy by phone tapping, the government has no right under any circumstances to tap any phone for any means without probable cause. Government phone tapping is said to be a key approach to staying one-step ahead of criminals and terrorists (â€Å"Bush Defends. †). The major problem with this argument is the enemy usually is too smart for phone tapping! Most often, terrorists and criminals are able to devise huge schemes to break the law without being caught. It is rather naive to assume that simple phone tapping will put roadblocks in their plans. Criminals and terrorists sometimes know the government’s plans and often they are aware of what the government is trying to do to discover their criminal acts and terroristic plots (Levy). For example, most terrorists and criminals assume their home phones are tapped and therefore they do not use them to plan their attacks or crimes (Finder). If phone calls need to be made, they normally are made off the premises or in public places. Therefore, phone tapping is too elementary to counteract their plans. Getting a court order to phone tap every public phone, for the possibility that a terrorist may use it, is quite trivial because that possibility is hardly probable enough to gain multiple phone tapping warrants (Hollingsworth and Mayes). When a phone is tapped, someone has to listen to every conversation, carefully listening for suspicious details or plans. This takes bodies away from more promising and pressing leads that quite possibly could uncover corrupt and illegal plans. In turn this actually results in phone tapping possibly aiding in criminal acts as opposed to hindering them (Levy). This idea that phone tapping aids in staying ahead of the criminals is too nominal to be considered an argument. It seems that the government is desperate to defend phone tapping so it devised this argument. Furthermore, the results that government sponsored phone-tapping produce are so marginal, it seems that spending time and money on it is futile (Levy). The government taps phones to discover evidence about a certain topic. Data mining is a system that aids in phone tapping: once a phone is tapped, all the conversations are data-mined to show trends which the government analyzes to decipher which phone records to dissect (Levy). The evidence discovered by data-mining and phone tapping only leads to more leads, meaning that intercepting evidence may identify a criminal or a suspect but most often does not lead any to incriminating evidence (Morgan and Padley). This poses a major problem. The government cannot risk picking which lead to pursue or not to pursue, and consequently they have to pursue every lead. This is extremely time consuming and if the lead turns out to be a dead end, all that time and money was wasted (Levy). Government phone tapping has so many drawbacks, is it not worth the trouble when the results barely ever produce incriminating evidence. The only legal way for the government to tap a phone is to obtain judicial authorization through a warrant (Gittlen). This system mandates collaboration between the National Security Agency and the federal courts, and forces the agency to have reasonable, coherent evidence to obtain the warrant as stated in a law developed in 1978 (Ashenfelter). Besides the National Security Agency and the judicial branch, communication companies are also involved in phone tapping. Legally, communication companies must aid in government phone taps when presented with a warrant (Ashenfelter). While communication companies are required by law to assist in warranted phone tapping, some phone companies have been assisting in phone tapping regardless of the presence of a warrant, claiming it is better to help them then to let the government do the tapping themselves (Gittlen). A serious question arises when an issue of national security is involved as to whether the government should be allowed to tap a telephone without first getting judicial authorization. The government’s most simple, but most crucial job is to protect its people and their rights at all costs. Currently, the United States is fighting a war on terrorism which threatens those rights. If the government is fighting to preserve those rights, how can the government rationalize encroaching or even suspending our basic rights for periods of time to guarantee their survival (Stephen)? The government’s own actions are conflicting with our basic rights which is what our country is supposedly fighting to defend (Finder). How can the government fight actions that threaten national security, when they themselves are doing the same things? The freedoms promised by the Constitution need to be present and permitted at all times. Subsequently, phone tapping encroaches on those freedoms making it unconstitutional. The claim that the suspension of our basic rights to ensure their survival is pure fabrication. Government phone tapping is an issue that has numerous aspects to it. As with all arguments, many people quickly judge without looking at the big picture. However, experts on the subject can see that phone tapping is both unnecessary and unconstitutional. Phone conversations are something that are held sacred to the public and are a basic right according to the Constitution. Under no circumstance, even desperation is the government allowed to break its laws. Ashenfelter, David, comp. Bushs Wiretap Program Gets a Weeks Reprieve. Detroit Free Press 28 Sept. 2006, sec. DN. LexisNexis Academic. McClatchy-Tribune News Service. Marywood University, Scranton, PA. 22 Mar. 2007. Browne, Harry. Does the Constitution Contain a Right to Privacy? 9 May 2003. Google Scholar. Marywood University, Scranton, PA. 22 Mar. 2007. Keyword: Phone tapping Privacy. Bush Defends Phone-Tapping Policy. BBC News. 19 Dec. 2005. 27 Mar. 2007 . Finder, Joseph. Tap Dance. The New Republic os 215 (1996): 14+. Wilson Web. Marywood University, Scranton, PA. 22 Mar. 2007. Keyword: government phone tapping. Gittlen, Sandra. How Do the Feds Tap Phone Lines? Network World 13 Feb. 2006. Google Scholar. Marywood University, Scranton, PA. 25 Mar. 2007. Keyword: federal phone tapping. Hollingsworth, Mark, and Tessa Mayes, comps. The Case is Notable for One Thing He Got Caught. The Guardian (London) 19 Mar. 2007, Final ed. : 8. LexisNexis Academic. Marywood University, Scranton, PA. Levy, Stephen. Only the Beginning? Newsweek 22 May 2006: 33. Wilson Web. Marywood University, Scranton, PA. 25 Mar. 2007. Keyword: Phone Tapping National Security. McCloskey, H J. The Political Ideal of Privacy. The Philosophical Quarterly 21 (1971): 303- 314. JSTOR. Marywood University, Scranton, PA. 24 Mar. 2007. Keyword: phone tapping. Morgan, Vivienne, and Ben Padley, comps. Using Phone-Tap Evidence Would Increase Convictions' The Press Association Limited 16 Mar. 2007, sec. PN. LexisNexis Academic. Marywood University, Scranton, PA. 22 Mar. 2007. Keyword: government phone tapping. Stephen, Andrew. A Nation Left Unprotected. New Statesman 5 Nov. 2001: 13-14. Wilson Web. Marywood University. 22 Mar. 2007. Keyword: Federal Phone Tapping. United States Constitution. Legal Information Institute. 2006. Cornell Law School. 25 Mar. 2007.

Literature and Modern Media 2 Essay Example | Topics and Well Written Essays - 1000 words

Literature and Modern Media 2 - Essay Example It is a mid-size entry-level luxury car and - so far – it has become Lincoln’s bestselling model since its introduction. The ad sought to articulate these features and the benefits in a short and engaging communication content. The difficulty in communicating all the features and benefits of the Lincoln MKZ was addressed by using metaphors depicted in compelling imagery. There are many sources that support the efficacy of using metaphors to produce compelling and persuasive advertisement. Among the most excellent of these is MacQuarrie and Phillips’ (2008) work, which documented numerous studies that demonstrate how metaphors induce a certain mental imagery that influences the behavior of people or, in the case of television advertisements, the viewers. They cited the case of a simulation where subjects were presented a poem with many metaphors and that based on the recorded participants’ interpretations, combined with sufficient exposure to visual images, were revealed to conjure mental imageries that support the construction and effectiveness of persuasive messages (39). The dynamics of the studies that revolve around this theme falls within the wider argument of the use of pathos in advertising and marketing. MacQuarrie and Phillips drew an analogy from the ancient Greeks, who coined the concept in their perfection of the art of rhetoric. They cited that pathos, which is the technique of appealing to emotions, is crucial in cultivating, diverting, enhancing or creating – whatever the need was – in some type of manipulation in order to achieve a desired emotional response (39). The idea – when applied in the context of marketing – is to increase the audience’s attitude towards the ad (39). Hoang (2005), describing a particularly adept marketer, had these words that expresses the impact of this particular method excellently: There was a feeling. As the feeling faded away into a labored, recalled me mory, it left another feeling, the feeling of desire. That was effective advertising (44). So, if one considers the metaphors used in the Lincoln MKZ ad, one could not help but recognize the pathos and the desire to influence by eliciting emotional response with the help of words and visual images. For instance, the video opens with the 2013 Lincoln MKZ’s comparison with the titular phoenix. Here, the introduction of the redesign and the new generation of Lincoln MKZ were achieved. There was the image of the old Lincoln model, which with the clever use of fire and graphical transformation, depicted the concept the phoenix in the process of being born, only that the bird did not really materialize. Rather, the 2013 MKZ emerged in its stead. To explain the utility of the metaphor, it is crucial to view it this way: emotion is difficult to verbalize. Therefore, in order to communicate to the emotion of others, metaphors must be used in order to be effective. â€Å"When emotions ,† wrote Malamed (2009), â€Å"seem ambiguous and ethereal, metaphors help make them explicit and tangible† (220). Stylistic and technical features were embedded in the comparison with the â€Å"hawk with night vision goggles†. The fun and car solidity were conveyed in the use of the beat of the drum set in a montage with the steady rhythm of machines, carving the hull of the

Construction Essay Example | Topics and Well Written Essays - 2000 words

Construction - Essay Example 2. b) Majority of the pitched roofs used in modern day construction use concrete tiles or fibre cement slates. For the use of tiles, they can be laid either in single lap fashion or double lap. Single lap tiles are made such that each tile overlaps the edge of its adjacent tile and is fixed with one nail per tile. They are fixed at pitches of 45 degrees. Double lap tiles are fixed with two nails per tile at pitches over 60 degrees. The following figure shows single and double lap tile fixing. 2. c) In context of pitched roofs, eaves is the term used to describe the lowest level tiles and also the timber used for supporting them. The eaves can be open or closed depending upon requirements or choice. Open eaves are those where the underside of rafters is exposed whereas for closed eaves edge rafters are made to project out in order to cover the underside of it. This is done by putting boards. Both kinds of roofs can be seen in the diagram below: left is open eaves and right is closed eaves. 3.a) For fixing a timer window frame into a cavity wall, we need to make sure the timber is hardened and dried so as to fix on both sides of a cavity wall. The general structure of a timber window frame is illustrated below. The number of rails shown here are not mandatory. It depends on the desired design of the window. However, the fitting and grip on the wall can be seen in the figure. Since the frame is made of timber, precaution needs to be taken that wood is not loose so that the fixing is permanent. Due to the cavity, the sill of the frame has to be made broader. The outside look of a timber frame when fitted to a cavity wall can be seen in the figure on the right. On the other hand, PVC window frames are made of PVC (Polyvinyl Chloride) which is a synthetic plastic made of oil or gas. The fitting of PVC frame is more expensive. A PVC frame can be seen in the picture below: The advantages of double glazing window

Cyber Terrorism and other types of terrorism in Australia Research Paper

Cyber Terrorism and other types of terrorism in Australia - Research Paper Example The practical difficulty in controlling cyber crimes made it one of the most dangerous terrorist activities of modern era. Since most of the critical areas of human life are making use of computers and internet at present, cyber attack can affect the social life drastically within a second. For example, transporting systems, power supply, military operation and telecommunication systems etc are relying heavily on computers and internet for its routine jobs and functions at present. Any problems occurred in the functionality of computers and internet can affect these areas negatively and cause immense damages to public life. This paper analyses the terrorism threats faced by Australia in general and cyber threats in particular. It is not necessary that cyber attacks may create physical ham alone to Australia. In fact cyber attacks can be used to defame a country like Australia in front of others. The most common form of hacktivism is the defacing of web pages to carry a message to the audience of that web site. The site shown in Figure below – an Australian business defaced to accuse Australia of being a terrorist country, is a recent example of hacktivism – as well as illustrating the tensions of the war on terror being transferred to the electronic realm (Ellsmore, p.5) The above webpage is a clear example of how the cyber attacks happening against Australia. Australia is a strong supporter of war on terror which is going on in Iraq and Afghanistan. Terrorists target all the countries which support war on terror in some way. Since most of the countries like Australia have strengthened the security measures against a physical or direct terrorist attack terrorists now adopting channels of indirect attack. Cyber attacks give them the luxury of attacking their targets from a distance and the chances of arrest or punishment are extremely rare. â€Å"Evidence exist s to suggest that al-Qaeda have also been using the Internet to collect & collate information about potential critical infrastructure targets† (Ellsmore, p.6). Internet is an ocean of information. It is not necessary to visit a place to collect information about it. All the details about all the places in the world are available on internet at present. It is easy for terrorist groups to collect and analyze this information before planning an attack on a particular target. The electronic information can be used for cyber attacks or even for physical attacks. According to the CERT Co-ordination Centre, the number of reported computer security incidents increased from 9,859 in 1999 to 52,658 in 2001, and we are on track for almost 100,000 in 2023. Similarly, the 2002 Australian Computer Crime and Security Survey found that 67% of respondents suffered a security incident, twice the level of 1994 (Ellsmore, p.8). The above statistics are clear indications of growing threats faced b y Australia from cyber terrorism. Cyber attacks can affect the productivity of organizations and employment losses to the employees. In other words, cyber attacks can destroy affect the financial systems more than the lives of the people. The expenses needed to conduct a cyber attack are extremely cheaper compared to the expenses needed for a physical attack. At the same time cyber attacks can cause more damages to the target than a physical attack. Moreover, the publicity generated by cyber attacks may create panic and disgust among the people. The above facts motivate terrorist in selecting cyber medium for their future channel of attack. â€Å"