Facts, Fiction and Apa Research Report

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Reconstruction of signals for data length of the ultrasonic signals Free Essays

string(42) " Simulated_stationary_1 0 100 Infinity 1\." Introduction: Since really early from 1960s, signal Restoration remained as one of the most popular and ambitious jobs for supersonic proving techniques in signal analysis. A figure of techniques have been developed since that clip, opposite and pseudo opposite filtering, rental squares methods, maximal information etc. However from the positions of assorted writers in all mentions in this thesis we can non stipulate that one method can be used to bring forth a high declaration in existent or practical applications. We will write a custom essay sample on Reconstruction of signals for data length of the ultrasonic signals or any similar topic only for you Order Now The ground of failure for existent universe applications of the signal Restoration is connected to the ill-posedness of the job. Ill-posedness can be defined as figure of independent grades of freedom of the deformed signal is by and large than that of the original signal [ 17 ] . Distortion is caused due to the noise and other effects ensuing in end product with some spectral constituents or uncomplete information. Therefore Restoration by necessity requires the usage of extra information about the original signal that is non present in the deformed signal ( end product signal ) . To reconstruct the signal every bit near as possible to the original signal is taken from a Priori cognition or from somewhere else. Deconvoltuion or decryption of the signals such as image, address, ultrasound signal received must be a replicate of the original signal sent signifier the transmittal terminal to analyze the concealed information in the signals from the surfaces under trial. To analyze the signal or information we need to deconvolve the signal or decrypt the informations. Assorted techniques are available in digital signal processing as described in the earlier chapters to deconvolve the signals. Deconvolution has shown promised consequences in signal analysis. There are different devonvolution methods in assorted signal spheres as classified in the chapter-2. Recorded Signals suffer from deformation map to bring forth the original signal. The chief ground for deformation is linear noise every bit good as the other internal and external effects. The pertinence of the proposed Wiener and Blind devonvolution based signal analysis techniques presented in the above two chapters are applied to the fake s tationary and non-stationary, existent clip signals. Our aim is to retrace the signals for informations length of the supersonic signals, Signal to resound ratio and the deformation maps. We think it will be better to advert that the signal analysis is carried out for fake and existent signal. When a existent signal is restored we do non hold an original signal. So in order to compare out our algorithms public presentation simulated signals are really helpful. It is really hard to supply a valid definition for comparing of existent signals in supersonic testing. In general the Ultrasonic Non Destructive Evaluation ( NDE ) is used for defect sensing and localisation in construction under trial. The recorded supersonic signal characterizes construction, defect or cleft, and material surface. These contemplations are called reverberations classified as, mistake reverberation, back-wall reverberation and the noise ( grain ) . The backscattered reverberations present valuable information pertaining to the features of stuffs. Most of the supersonic applications i.e. subsample clip hold appraisal, deepness profiling, thickness measuring of thin beds rely on high declaration Deconvoltuion. Consequences and treatments: In this chapter we focus on public presentation of the Wiener, Blind and some other deconvolution techniques from the MATLAB tool chest for different parametric quantities such as, The signal Restoration is carried for existent with different lengths ( sample N = 256, 512, 1024 ) . Signal-to-Noise Ratio is calculated Minimal Mean Square is estimated comparing the obtained coefficient of reflection map ( particularly simulated signals ) . Ocular comparing ( proving ) utilizing the estimated signal with the original signal. Deconvolution operation is performed on fake stationary and non-stationary signals and every bit good as the existent signals. We need to cognize about the deformation maps. Here we present the signals and Impulse response maps. we have simulated a stationary and non-stationary signals. the analysis is carried out utilizing the consequences of the existent signals and fake signal. We have two signals recorded from 50MHz and 230MHz transducers. We present the signals, Signals recorded in supersonic non-destructive rating from the surfaces under survey are distorted by features of noise arising from internal and external beginnings, and extension waies. The two of import features restricting the public presentation of the Wiener deconvoluion are Attenuation of noise in the supersonic signal, and Band bound. Since the frequence bandwidth of the original signal is by and large narrow, frequencies beyond this limited part in impulse response lend a small in signal Reconstruction. Wiener filter is called Minimal mean square ( MMSE ) calculator. It is sensitive to the power spectrum of the original surface. In this the reconstructed coefficient of reflection map differs in frequence features. It is proved that wiener deconvolution when suitably applied can supply effectual consequences even under unfavorable conditions [ 84 ] . In this we present a solution for signal Reconstruction utilizing wiener filter theory. The public presentation and the analysi s of the consequences are chiefly affected by noise. NOISE LIMITS THE AMPLITUDE OF THE REFLECTIVITY FUNCTION, as per the consequences shown below. Due to signal to resound ratio in the denominator Wiener filter underestimates the amplitude as shown in equation ( 5.1 ) . High declaration signal Restoration can be achieved by big SNR betterment without deformation. Ten ^ ( ? ) =G ( ? ) Yttrium ( ? ) = [ ( H^* ( ? ) ) / ( |H ( ? ) |^2+ ( S_v ( ? ) ) / ( S_x ( ? ) ) ) ] Y ( ? ) — — — ( 5.1 ) Where, G ( ? ) = Wiener filtering S_v ( ? ) and S_x ( ? ) are power spectra of noise and original signal. Noise can be reduced different signal processing methods, as discussed above to cut down the electrical noise, even after averaging if the SNR is deficient filtering is required, the lower the SNR, the restored map becomes undependable. High declaration or acceptable consequences can by taking a moderate SNR. Reliable coefficient of reflection map can obtained for a moderate SNR. The consequences presented below are at different SNR values such as eternity, 20db, 40db. Fake Stationary signal: Signal Sigma noise coefficient Gamma Thresholding SNR dubnium Mistake MSE Simulated_stationary_1 0 100 Infinity 1.0982e-005 Simulated_stationary_2 0.1 100 20.9315 0.4214 Simulated_stationary_3 0.01 100 30.5329 0.1387 Simulated_stationary_4 0.001 100 40.7859 0.0117 Fake non-Stationary signal: Parameters for fake non-stationary signal: Signal Sigma noise coefficient Gamma Thresholding SNR dubnium Mistake MSE Simulated_stationary_1 0 100 Eternity 0.3320 Simulated_stationary_2 0.1 0.3 3.443 0.4214 Simulated_stationary_3 0.01 0.98484 13.0852 0.5831 Simulated_stationary_4 0.001 100 23.2153 0.3368 To back up the account on the effects of noise to retrace the coefficient of reflection map in above few pages is presented utilizing consequences from the fake signals. The consequences tabulated in tabular arraies ( table 5.1 and table 5.2 ) show that SNR limits the signal Reconstruction. Better public presentation can be obtained by bettering the signal-to-noise ratio. One of the many methods to better the signal to resound ratio is to extinguish the background noise utilizing the thresholding procedure. One of the methods is threshold method in reverse filter explained in chapter -3. The lower the SNR, the larger the variableness of estimated spectra and hence the more undependable the computed maps and restored signal. The application of Wiener filtering is utile merely if the SNR is moderate for the of import signal frequence constituents. Data provided in the tabular array ( ) support that the SNR value limits the amplitude of the coefficient of reflection map. In the undermen tioned subdivision we restore the coefficient of reflection map for the existent signals. The job is we do non hold the original signal to prove the public presentation. It is apparent that the signal constituents obtained by Wiener filtrating are utile when restored with MODERATE SNR value. So we assume signal restored with moderate SNR value contain utile information for the signal analysis under Wiener filtering. Signal Restoration for Real Signal recorded utilizing 50MHz ( 1:1024 ) : Signal Sigma noise coefficient Gamma Thresholding SNR Doctor of Divinity Our purpose is to reconstruct the first from each pulsations of signal as shown in the figure ( 5.9 ) . Now we deconvolve the signal for three different length where N = 256, 512 and 1024. Thus the lengths of the sequences will the consequence the Restoration of the signal. The Restoration is performed utilizing different deformation map or impulses responses. The sequence selected 1:212, The sequence is selected from 1:540, Next we will show by changing the noise coefficient sigma for the above set of sequences and the values are tabulated, Signal Sigma Gamma Thresholding SNR Doctor of Divinity From the tabular array, the first and 2nd rows correspond to the signals with the sequences ( 1:212 A ; amp ; 1:540 ) with the parametric quantities such as the noise coefficient sigma =0, when we compare the figure-5.11 with figure- 5.13 and figure- 5.12 with figure- 5.14 the coefficient of reflection is much more better than the other the 1. The figures 5.13 and 5.14 are the signals with added noise ensuing in a moderate SRN value. As discussed in the above subdivision to obtain a high declaration end product we need to seek for a good or moderate SNR and every bit good as the Thresholding value it minimizes the background noise and therefore ensuing in a better coefficient of reflection map. Harmonizing to the belongingss of supersonic signal, the incursion or the traveling is limited harmonizing to the frequence of the signal. The lower the frequence of the transducer more the ultrasound signal can inspect the construction under trial. Due to this restriction, we have a job even when entering the signals. In this above subdivision we presented the Deconvolution operation on the 50MHz signal, here we produce some consequences obtained utilizing 230MHz, for different sample lengths e.g. 1024, 256 and 512. Some of the signals and urges responses are as shown, Simulation-1: existent signal A * impulse response-A ( 20:900 ) : Simulation 2: Blind Signal deconvolution: In this subdivision we use the blinddeconvolution availabel in matlab signal processing tool chest. We use deconvblind to reconstruct the coefficient of reflection map. For above mentioned signal in Figure- 5b. Coefficient of reflection maps are restored for the signals recorded usinf 50MHz and 230MHz utilizing the impulse response. Simulation 1: Simulation 2: The consequences are produced utilizing iterative process. Appraisal of the parametric quantities is implimented utilizing Maximal Likelihood method. We foremost estimate the coefficient of reflection map x ^ ( T ) which is given in timedomain as, ten ^ ( T ) = ? Y ( T ) The iterative theoretical account in frequence sphere is given as, Ten ^_0 ( ? ) = ? Y ( ? ) Ten ^_ ( k+1 ) ( ? ) = X ^_k ( ? ) + ? Y ( ? ) – Ten ^_k ( ? ) H ( ? ) The chief advantage of the iterative filter iterative process is that it can be stopped after a finite figure of loops. Using this method high declaration end product can be obtained because this method is less sensitive to the noise. Decision: In the field of supersonic Non Destructive Evaluation ( NDE ) , the Restoration of signal is the chief job. Therefore, in this thesis the classical and the conventional deconvolution methods are studied and implemented to reconstruct the coefficient of reflection map of the sparse signals. One of the of import factors is execution of these two methods to reconstruct thin signals. Though there are some advanced techniques already in usage, such as – ripple, thin deconvolution and fiting chase. Here, we have used Wiener and Blind deconvolution techniques to reconstruct the coefficient of reflection map from the sparse signals. These methods are chosen with regard to the handiness of the clip and cognition I have sing the topic. The motive behind taking this subject as a portion of my MSc thesis is to better my bing cognition on the digital signal processing techniques and its applications in Ultrasonic Non-destructive rating methods. We think it will be better to advert about th e background I have on the Deconvolution technique before get downing this undertaking. The lone thing I know is that deconvolution is the reverse operation of whirl. Deconvolution is known as opposite job. Performance of the coefficient of reflection map depends on the word picture or appraisal of the deformation map or Point Spread Function ( PSF ) . We restored coefficient of reflection map utilizing a non-blind deconvolution and a unsighted deconvolution technique. Non blind deconvolution can be advantageous, since it admits a closed signifier solution via Wiener Filtering. Additionally, in the instance of non blind deconvolution, it is easy to integrate diverse statistical priors on the surface coefficient of reflection map under trial. Once the PSF is known it is no longer important to reconstruct the coefficient of reflection map. The non blind deconvolution should be considered as an of import boosting phase supplementing the opposite filtrating [ 68 ] . Two related steps of public presentation will be used to assist over the quality of Restorations: the mean square mistake and the betterment on signal/noise ratio ratio. Even though MSE is non a dependable calculator of the subjective quality of a restored signal it will be used to give some indicant of the public presentation of the method. Performance of the algorithms is similar to that for noise less conditions. The consequences obtained for different Signal-to-Noise ratios are tabulated in ( 5.1, 5.2, 5.3 and 5.4 ) . It is apparent from the tabular arraies that wiener filtrating conserves most of the information associated with the signals at parts of high signal to resound ratio in the frequence sphere. Wiener deconvolution produces high declaration coefficient of reflection map for stationary signals. The public presentation of the proposed Wiener deconvolution is investigated on the fake stationary and every bit good as the non-stationary signals. Using wiener deconvolution to a computing machine generated signal is summarized. In the above figure ( 1 ) shows the convolved signal Y ( T ) ( 2 ) is the impulse response ( 3 ) coefficient of reflection map ( 4 ) Reconstruction of the coefficient of reflection map. The coefficient of reflection map is reconstructed for different SNR = inifinty, 20dB, 40dB. The figures 5.1-5.4 represent the coefficient of reflection maps with diminishing MSE with increasing SNR. Wiener filter method has satisfactory public presentation at comparatively high SNR values. At low SNR values wiener filter method public presentation is badly affected by noise. Future work: Harmonizing to the increased broad scope of applications based on deconvolution of supersonic signals, wiener deconvolution and blind deconvolution are studied and implemented in this thesis. Wiener filtering is called Minimal Mean Square calculator. This job has a broad assortment of applications in digital signal processing like geophysical modeling, supersonic analysis or bio-medical technology. Wiener Filtering is sensitive to the noise. Implementing Wiener filtrating suitably can bring forth appropriate consequences even under unfavorable conditions. In existent universe applications it is hard to gauge parametric quantities or conditions suitably. Signal analysis is carried out utilizing sweetening of Signal-to-Noise ratio and gauging the Minimum Mean Square mistake. Signal to resound ratio is enhanced by extinguishing the background noise or deformations added to the signal recorded from Ultrasonic Non destructive rating. The Minimal average square mistake is decreased by bett ering the SNR value. Another classical method implemented in this thesis is Blind deconvolution. Signal Restoration appears in many Fieldss. These Fieldss have different purposes for signal Restoration, but certain basicss are common to all signal Restoration. As explained earlier signal debasement is due to two grounds ( a ) Noise, and ( B ) Distortions. The cardinal hurdle in signal Restoration is lack of information. In some instances it is non possible to hold cause for signal debasement. Most of the signal Restoration algorithms by and large require some a priori information in order to reconstruct the signal. The a priori information in blind deconvolution is estimated utilizing the maximal likeliness appraisal method. The above discussed two methods autumn under 2nd order statistics. These methods suffer from non minimal stage job. To get the better of the job high order statistic method is approached. The high order statistic methods exploit the belongingss of cumulants and polyceptra as mentione d in chapter -4. Execution of this method depends on the cognition of high order cumulants of the involved signal. Third order statistics based method is the particular instance out of the High Order statics, enables to [ 28 ] , Operate under high signal to Noise ratio, Operate expeditiously under the noise environments Continue the exact non minimal stage. It is clear that the conventional deconvolution techniques can non supply a high declaration end product when applied for thin signals. Transform-domain supersonic signal processing techniques were developed to find the defects in thin multilayered construction. In all these methods broadband supersonic signals were used, which are analysed in the clip or frequence spheres. These signals are normally clip limited or band-limited. The time-domain processing techniques can be confounding when the signals are distorted or the reverberations overlapped. The frequency-domain processing techniques are non suited when the defects are close to the surface or the reverberations overlapped [ 34 ] . So the hunt for dependable techniques is demanded. To obtain utile information about the concealed defects, time-frequency signal representation is developed. Thus L1 NORM DECONVOLUTION produce a high declaration end product even applied for thin signals. The time-frequency sphere methods such as WA VELET TRANSFORM, MATCHING PURSUIT and SPARSE DECONVOLUTION will bring forth high declaration coefficient of reflection map from thin signals. Ripples Transform: Ripples is a quickly germinating signal processing technique because of their localisation parametric quantities that adapt better to the signal features than the traditional Fourier transform. Applications range in many Fieldss such as, geophysical sciences, mathematics, and theoretical natural philosophies and in communicating. There are different types of ripple transform method, Continuous ripple transform, Daubechies wavelet transform Gabor transform. Discrete ripple transform The ripple transform is defined in the footings of footing maps obtained by switching and dilation [ 39 ] . It is found that Gabor transform to be the most suited method to supply information in clip frequence sphere. Wavelet transform is the correlativity between the signal and a set of basic ripple. The information presented in this subdivision is collected form mentions [ 39, 40, 85, 86 ] . In ripple transform an square integrable female parent ripple H ( T ) is chosen to analyze a specific signal. Number of daughter ripples ha, B ( T ) is generated from the female parent ripple H ( T ) by dilation and displacement belongingss. The ripple sequence W ( a, B ) of the signal ten ( T ) are given by, W_s ( a, B ) = ? _ ( -8 ) ^8? s ( T ) ? h^* ? _ ( a, B ) ( T ) ? dt = s ( T ) ? 1/va h^* ( t/a ) Where the girl ripple map is given by, h_ ( a, B ) ( T ) = a^ ( 1/2 ) .h ( ( t-b ) /a ) This is the basic ripple transform theoretical account. This theoretical account can be used to observe the pulsation and suppression of noise. Using this ripple transform technique the signal is represented in time-frequency sphere. For the appraisal of the daughter signal see [ 39 ] . One of the advantages of the ripple transform is the sub set filtrating that decomposes a signal into different frequence sets. The signal is divided in to estimate and item coefficient such as, A1 and D1 for the first degree decomposition so these are decomposed in to A2 and D2. It repeats this process until the degree reaches the upper limit that is limited by m where the entire information is 2m. The decomposition is represented by Discrete Wavelet Transform ( DWT ) in figure. How to cite Reconstruction of signals for data length of the ultrasonic signals, Essay examples

Minority Groups Issue in Modern World

Introduction Minority groups have always been part of every society. In any given society, there are those people who are considered weak or lesser by virtue of one aspect or another most of which are natural.Advertising We will write a custom essay sample on Minority Groups Issue in Modern World specifically for you for only $16.05 $11/page Learn More Women have for a long time considered as minority groups in many societies; always taking the second place after men and always being denies opportunities which they deserve just by the mere fact that they are women. However over the years, the situation has changes and most minority groups and especially women have come out strongly to defend their position in the society. They have formed unions under whose umbrella they fight for their rights ensuring that they are not discriminated against just by the mere fact that they are women. Women have also managed to fight for a level paying ground and an equal platform just their male counterparts so that positions of leadership and other influential positions are given by merit and not based on gender or any other consideration. This discussion looks at the range of actions that minority groups are taking to advance their interests within the union movement and what other actions they could take to further their cause. Special attention will be paid to the different strategies and methods that minority groups are currently using or might use to further their goals. Who is a Minority Group? A minority group is segregated group in a society which always small and hence the name minority which is hardly incorporated or recognizes as part of the society. More often, this people are ignored or sort of disregarded and they are not sufficiently involved in social matters especially those that regard development.Advertising Looking for essay on history? Let's see if we can help you! Get your first paper with 15% OFF Learn More It is the continued sidelining of minority groups over the years that has resulted to the minority groups coming up with various strategies so as to advance their interests and ensure that they also participate actively in various developmental issues and other issues that are of societal concern. Minority groups are based on a number of factors mainly gender, age, sexual affiliation or general perceptions held by an individual (Simpson Yinger, 2005, p. 43). In the modern society, the most common minority groups include women based on their gender, children based on their age, lesbians and gays based on their sexual affiliation and other people who hold views that are not very popular with the rest of the society. As experience may have proven, it is not always easy to live under the umbrella of stereotype that most minority groups have to contend with. It is as if you do not belong in your very own society. It is a stereotype that has seen most of those belonging to minority groups a ttempt to break away if only to be treated in more â€Å"normal† way. However, with the strategies discussed below, it has become easier for these groups to find a place in the society where they could lead a productive life in the society and prove to the rest of the society that they are no different and can do equally good if not better just like everybody else. Strategies Used One strategy that has proven successful in helping minority groups advance their interests is joining union movements. Usually, a union movement is a group of people who come together with the main goals of ensuring that their interests are taken care of.Advertising We will write a custom essay sample on Minority Groups Issue in Modern World specifically for you for only $16.05 $11/page Learn More Union movements are common especially among workers in different sectors who come together to ensure that all their rights are respected and that they are able to advance othe r common interests they may have. It has also been noted that unlike in the past where most minority groups considered themselves lesser in their manner and behavior, this has since changed as most minority groups now consider themselves equal with other people (Whitley Kite, 2009, p. 65). In the past, most minority groups seemed to agree with the rest of the community that indeed they were lesser and did not have as equal rights as the rest of the people to access opportunities in different aspects of life. Minority groups have now come out strongly to show the rest of the world that being small in number of holding a view or perception that is not as popular does not make them any less. They have therefore become more assertive than they were previously and this has by and large helped them advance their interests. Unity is another aspect that has helped minority groups thrive and advance e their interest in the increasingly hostile society. Minority groups have been teaming up t o form groups of their own with vested interests. For instance, women who have for a long time been considered as minority in many societies have found ways of empowering themselves by coming together to form groups which they use to come up with projects that are highly beneficial to them and to the society in general. Women for instance perhaps due to the fact that it is one of the minority groups that has been with the society for years has become more vocal than any other minority groups.Advertising Looking for essay on history? Let's see if we can help you! Get your first paper with 15% OFF Learn More Women have come out strongly to assert their positions and there are now more women in positions of leadership and power more than there were a couple of years back. Women have also formed various help groups and have come up with very successful projects most of which are income generating. Thus, besides providing a steady income to these women, they are also beneficial to the society and they have helped the general society change their general perception about women. Another strategy that most minority groups are using to advance their interest and further their goals is by teaming with non-governmental organizations who provide funding that is required to help kick start their projects. The non governmental organizations have been very instrumental especially in supporting women groups implement their projects thus making the society a better place. Another strategy that has helped minority groups come out from what is seen as cacoon is by actively participating in forums of nat ional issues and general societal concern. Women for instance have been participating in religious issues and some are already holding positions of importance in the religious domain. About a decade ago, women could not be allowed to hold such positions. Women and other minority groups have therefore come out to show the rest of the society that indeed they have equal potential and can equally perform well when given an opportunity. Minority groups have also been holding demonstration in an attempt to have the voice heard. These peaceful demonstrations have helped a great deal because even the government listens to these groups when they demonstrate. The essence of these demonstrations is to make an assertive voice to the government, policy makers and the society in general that the minority groups also have a right to be involved and adequately so in the participation of making decisions. Of all the minority groups that there are, the women and the young people can be said to be th e most successful. Perhaps this is because the basis on which they are considered to be a minority group is not controversial. Lesbians and gays have not been having to easy in trying to find their position in the society. Perhaps due to the fact many people in the society based on their upbringing do not consider these practices correct, the minority groups may be said to be finding it even more challenging than women and young people have. They have however continued to hold peaceful demonstrations asking the society to view them as normal whose sexual affiliation should not be used to alienate them. Unlike when these practices first merged, the society seems to be slowly accepting this group of people although there is still a tendency to look at this group of people as though they are not normal. People suffering from disabilities are also part of minority groups and they have also had a fair share of challenges in having the society accept them and consider them as equally pote ntial people who can deliver when given an opportunity to (Sproule, 1989, p. 123). The media has played a major role in highlighting the plight of minority groups and influencing the society to start viewing these people from a different angle. Currently, there are several people with disabilities who are holding managerial positions and this goes to show that the society is changing positively and learning to accept that disability is not inability. Other tactics that minority groups may use to further their goals and ensure that they have an impact in the society is by ensuring that they are more united than ever before ( Pentassuglia, 2009, p. 54). It has been noted that while segregated groups form unions to represent their rights and interests, the majority of people are left out and this means that there are many people belonging to the minority groups especially at the grass root level who do not have any support. It is important therefore for the lobby groups to ensure that all persons falling under the category of minority groups are well represented. Collaboration with civil rights movements is yet another strategy that will work well in helping the minority groups further their goals. Conclusion Women are perhaps the best example of a minority group that has managed to liberate themselves using most of the above discussed tactics. In the modern world, the woman is holding just as good a position just her male counterpart. In this century, minority groups have risen to show the rest of the society that they are equally part of the society and that they also have a big part to play in making the world a better place. If the trend that most minorities groups are taking is anything to go by, then it would be correct to say that in a couple of years to come, there may in fact not be any minority groups in the society. Instead, there will be many different groups with different agendas but bring considered as rightfully belonging to the larger society. Re ferences Pentassuglia, G. (2009). Minority groups and judicial discourse in international law: a comparative perspective. LA: Martinus Nijhoff Publishers. Simpson, G. Yinger, J. (1985). Racial and cultural minorities: an analysis of prejudice and discrimination. London: Springer. Sproule, W. (1989). Minority Groups. New York: Gage. Whitley, B. Kite, M. (2009). The psychology of prejudice and discrimination. New  York: Francis and Taylor. This essay on Minority Groups Issue in Modern World was written and submitted by user Forge to help you with your own studies. You are free to use it for research and reference purposes in order to write your own paper; however, you must cite it accordingly. You can donate your paper here.

Concentrated Media Ownership and its Implications Essay Example

Concentrated Media Ownership and its Implications Essay Example Concentrated Media Ownership and its Implications Essay Concentrated Media Ownership and its Implications Essay Most industrialized societies understand that monopolies are generally harmful to the average consumer, and many have taken steps to protect the consumer from price gouging and other related misbehaviors of monopolistic companies.   Unfortunately, the media can also be a monopoly.   If a range of media providers is controlled by a small number of companies or individuals, the result can be equally as damaging to readers and viewers, the consumers of media.   Thus, this type of concentrated media ownership in Australia severely limits the type of programming available to the readers and viewers. Concentrated media ownership in Australia affects consumers in two realms:   the entertainment industry and the information industry.   The content in both of these realms is severely limited by concentrated media ownership.   With television programmers vying for ratings, the stations are going to give people a big dose of what sells.   The diversity of programming will suffer, with shows that focus on education, the arts and social issues suffering in lieu of violent crime dramas, sexual sitcoms and other â€Å"saleable† programs.   According to Ted Turner, a media mogul himself, â€Å"Media companies have gotten so large and concentrated that an independent voice has an almost impossible time getting started in any kind of meaningful way, and thats a great tragedy for our country† (Lieberman, 2003).   The result is a whole lot of the same old thing. With an even wider impact is the news media.   The news media has become the 4th estate in the eyes of many, as it is present to watch and report issues of political and social concern.   According to media analysts, the media plays â€Å"a vital role in linking citizens and the state† (text, 2006, p. 41). Unfortunately, when the media companies become monopolistic or oligopolistic, these wide ranges of news coverage diminish.   Political affiliations become more important than objective reporting while sensational, dramatized news becomes the norm because it is what sells advertisements. Ralph Nadar, a prominent economist, fears that this trend, which is the norm in Australia, especially after the amendment to allow companies to own multiple stations or newspapers in a single market, will lead to a dumbing down and eventually to censorship of certain content.   â€Å"It will lead to more absentee, remote, syndicated, and automated control of local TV stations, warns Nader† (Benjamin, 2003).   The frightening thing is that media can even affect policy because the elected officials, with the support of the TV stations, ultimately pass the laws for the state (text, 2006, p. 32). At its worst, the media can actually determine what people believe.   This happens for two reasons.   First, if the media does not report news, then the public does not know the facts.   Secondly, the way the media spins the news via the reports it airs affects the interpretation of the events.   This has horrible implications for all viewers.     Ã¢â‚¬Å"The nations most powerful media companies are trying . . . to gain total control over the news and information that Americans are allowed to read, see, and hear† (Benjamin, 2003).   Once this occurs, the public will be at the mercy of the media companies. Sadly, this type of concentrated system simply feeds on itself.   It does not provide any means for competition or even dissenting viewpoints.   The public broadcasters or independent companies cannot compete for the advertising dollar or even afford the technology that the larger companies can; they are effectively edged out of the market, if they even have a foothold at all.   The politicians, through the support of the media, even affect the policies and laws that people have to live by.   This situation is not amenable for the viewing and reading public.

SAT Score Range The Complete Story

SAT Score Range The Complete Story SAT / ACT Prep Online Guides and Tips What is the range for SAT scores? How do your scores stack up? In this article, I’ll give you a basic rundown of the range of scores you can expect on the SAT and help you put your scores in perspective if you’ve already taken the test. SAT Score Range: The Basics The SAT is scored on a 1600 point scale, and composite scores range from 400 to 1600.You composite score represents the combined scores of two test sections: Evidence-Based Reading and Writing, scored from 200 to 800, and Math, also scored from 200 to 800. You get three test scores in Reading, Writing, and Math on your score report, but they range from 10-40 and will not be a concrete aspect of your final composite score.The SAT score reportalso includestwo cross test scores and seven subsection scores that are designed to give you a more complete picture of your strengths and weaknesses based on which questions you answered correctly. The essay is optional (like it currently is on the ACT) and does impact your composite score; the essay score is reported separately. Want to learn more about the SAT but tired of reading blog articles? Then you'll love our free, SAT prep livestreams. Designed and led by PrepScholar SAT experts, these live video events are a great resource for students and parents looking to learn more about the SAT and SAT prep. Click on the button below to register for one of our livestreams today! Average SAT Scores The national average for composite SAT scores is around a 1500.For 2014, these were the average section scores: Critical Reading: 497Math: 513Writing: 487 Total: 1497 If you’re scoring above a 1500, you’re already doing better than half of the country.If you’re scoring above an 1800 you’re in the top 25% of scorers, and if you're scoring below a 1260 you’re in the lowest 25%. In the end, you shouldn’t worry about these averages nearly as much as you should worry about averages for your particular college.Some schools don’t even consider the Writing Score, like schools in the public university system in Massachusetts.Admitted students to UMASS Lowell last year had an average combined Critical Reading and Math score of 1150, meaning they scored slightly higher than average on each test. If you want to have the strongest chance of getting into a school, you should aim for the 75th percentile score (a higher score than 75 percent of admitted students).If you’re hoping to get into schools in the Ivy League and other top schools like MIT and Stanford, you will be expected to have scores that are in the 2200-2400 range.To use Stanford as an example, the 75th percentile composite score for applicants this past year was a 2360! To learn more about what scores you should aim for, check out our article on figuring out your target score. Ugh Stanford get over yourself. NO PLEASE TAKE ME YOU'RE BEAUTIFUL. Studying for Your Score Goals Now that you have a better sense of the possible score range on the SAT, you can take a practice test (or take a look at scores from an SAT you’ve already taken) and see where you fall in the rankings.If your scores aren’t where you need them to be yet, that’s ok! You will just have to plan out your studying time accordingly. I’ll outline some brief guidelines below, but for more information read my article on how long you should study for the SAT and our complete study plan for the SAT. I’m Looking to Improve 100-200 Points This will require about 40 hours of studying on average.Plan ahead a couple months or so before your test date - if you give yourself two months, five hours of studying a week should get you up to speed.If you prefer to spread out your studying more, you might start studying six months in advance and schedule out one or two hours a week for SAT prep. I’m Looking to Improve by Around 300 Points This will require about 60-80 hours of studying on average.You should plan out your studying at least three or four months in advance and be prepared to study for five hours every week.In this case it would probably be easier to start studying six months or more before the test. If you think you might need longer study time because you often get distracted or have difficulty learning quickly from your mistakes, you should definitely plan on starting six months in advance and studying at least two or three hours a week. I’m Looking to Improve by 500+ Points This is a big goal, so you should be prepared to study for 150+ hours to reach it.If you start six months before the test and study for five hours a week or so, that should be enough to get you close to a 500 point improvement. Remember, though, if you want to improve by this much, yourstudying has to be super high-quality!Mark any questions you don’t understand on practice tests and figure out what the problem is that’s causing you to make mistakes.Fully understanding your mistakes and figuring out how to correct them is the key to making significant improvements! Summary Here are some of the main points you should know about SAT scores: Composite scores range from 600 to 2400 Critical Reading, Math, and Writing are each worth 200 to 800 points Nationally, the average SAT score is about 1500 You should check the average scores for the schools you’re applying to, and try to aim for the 75th percentile score as a goal for yourself.Everyone has a different target score!You can make a study plan depending on how much you need to improve, so your scores will be in the right range by the time you take the real test. What's Next? Trying to decide when to take the SAT? Read this article to find the best test date for your situation. If you plan on taking the new SAT but have been practicing with the old SAT, take a look at the charts in this article to convert your scores and see where you might fall within the new 1600 point score range. Score choice and superscoring are two policies that might impact your test taking and studying plans for the SAT. Read more about these policies and the difference between them. Disappointed with your scores? Want to improve your SAT score by 160points?We've written a guide about the top 5 strategies you must be using to have a shot at improving your score. Download it for free now:

Design and the New Ornament Case Study Example | Topics and Well Written Essays - 1500 words

Design and the New Ornament - Case Study Example The Latin term memento mori stands for - remember that you must die. They remind that everyone is mortal. 'Memento' also stands for 'a point of departure'. A deviation. Perhaps even signifying unfaithfulness. 'Memento Mori' is also the title of a story written by Jonathan Nolan. The complex story is centered around a man named Leonard in a mental institution. Leonard has problems with his memory and so has to depend on notes and pictures to daily remind himself about what he has to do, even simple chores like brushing his teeth. The extend of his brain damage could be gauged from the scenes of Leonard trying to cope with his daily life. The main cause of his problem is the rape and murder of his wife. This is all he can think of, and he carries on with notes written in italics to himself stuck all over the ceiling where he stoically explains why he could never lead a normal existence. He seeks revenge for his wife's murder knowing he cannot get over it. This is the only scene fresh in his mind and memory. The story is interspersed with five brief scenes in Leonard's life - waking up in a mental institution, trying to go through the process of brushing his teeth, waking up fully clothed in bed, and then reading the note on the ceiling telling him he must escape the institution to find his wife's killer.He opens his eyes to find himself getting a tattoo, waking up in a hotel room, and examining all his tattooed facts and instructions, including a sketch of a man's face; looking out a car window at a dead man on the sidewalk with a face matching his tattoo, then finding that he is handcuffed and can't find a pen as the car pulls away from the scene.The human mind, conditioned largely by what we read, learn and are told, is rather crazy. The images it creates in people's minds, seen or unseen, largely influences the person to go in for a particular tattoo design at a specific spot in his or her body. Earlier, tattoos were largely used by ruffians, outlaws and biker gangs. But now even ce lebrities sport tattoos and complement their piercings. (www.tattoos-the.com). History of the tattoo The word 'tattoo' comes from the Tahitian word tatau. In the 1800s tattoos were particularly popular in England where sailors would get them as permanent souvenirs of their travels (www.tattoos-the.com). Tattoos have been around for thousands of years. They have been found in 3,000 years old Egyptian mummies. They are sported in designs of all kinds, plain, elaborate, colorful, almost always personal. Permanent once etched, they serve as amulets, status symbols, love emblems, adornments, and even signs of religious beliefs. Joann Fletcher, research fellow in the department of archaeology at the University of York in Britain, describes the history of tattoos and their cultural significance to people around the world, from the famous " Iceman," a 5,200-year-old frozen mummy, to today's Maori. www.smithsonian.com1. If you're thinking about getting a tattoo, make sure you are up to date with your immunizations, and plans about where to go for medical care if your tattoo becomes infected.Added to these, you have to take the precaution of consulting your doctor if you

Adaptive Optics for Vision Science Term Paper Example | Topics and Well Written Essays - 750 words

Adaptive Optics for Vision Science - Term Paper Example Astronomers have come up with a system that improves on the optic systems; used to study space that can counter this distortion brought about by the front waves, a system known as â€Å"Adaptive Optics†. Adaptive optics refers to an astronomy technology that improves the performance of optical systems through reduction turbulence of the earth’s atmosphere distortions. Adaptive optic system purposes to correct deformations Caused by the turbulence of the earth’s atmosphere. This correction happens by using deformed mirrors that are controlled by a computer so as to compensate for the distortion by the incoming wavefront. The image obtained through this system is usually as sharp as the ones taken in space. The system allows observation of dimmer (faint) astronomical details of the corrected optical system that would possibly be observed from the ground. For the system to work effectively, it requires a bright reference star located close to the object being studie d. Astronomers do create artificial stars by shining a very strong laser beam into the upper atmosphere of the earth, in cases where an appropriate natural star is not available around the object of study (Hardy, 2010). Normally, light gets distorted as it passes through the wavefront thus preventing the formation of sharp images by a telescope placed on earth’s surface. The adaptive optic system eliminates this blurring effect of the atmosphere. The adaptive optics works by measuring atmospheric distortion in the light coming from the star or the other artificial source of light. Electronic signals are then sent to a deformable mirror that rapidly changes its shape to correct this distortion. This system has the ability to see hundreds of separate beams of light while looking at a single beam of light from a star even those that have been deviated due to atmospheric turbulence.