Multipath Fading Channels And Transmitted Signals Computer Science Essay

Multipath Fading Channels And Transmitted Signals Computer Science Essay Multipath fading is a phenomenon of fading of transmitted signals due to refraction, reflection and diffraction from objects or obstacles present in the line or way of transmission. In this article, we have be realized an example of multipath fading channels such as in case of Rayleigh fading channels using MATLAB and would be analysing the variations incurred after varying system parameters such as samples per second and Doppler shift of the respective blocks of the Rayleigh fading system. Also, here screen shots of the respective variations have been provided for clear understanding of induced variations. 1. Introduction As mentioned earlier as well, multipath fading is the occurrence of fading of transmitted signals by refraction, reflection and diffraction due to obstacles present in the line or path of transmission and channels affected due to this type of fading are called multipath fading channels. Rayleigh fading is nothing but the statistical model that communication engineers use to study the characteristics propagation of radio signals, in case of wireless propagation channels. In general, Rayleigh fading model is used for studying ionospheric and tropospheric signals propagation and such that the signals are transmitted in a widespread manner i.e. they are transmitted in form of concentric rings throughout the atmosphere. Thus, these are not used to study the fading that occurs in line of sight propagation (for that Rician is preferred over it). The Rayleigh fading channel can be used to study fading characteristics such as in cases of densely populated cities with a large number of skyscrapers (such as Central London and NYC). The central limit theorem limits this concept such that the amount of scatter can be considered as a function of irrespective of individual function of Gaussian distribution. The impulse response can be modelled a random function varying from 0 to 2pie [1]. The probability distribution function R(of Rayleigh fading) can be given as; Where, ÃŽÂ © =  E(R2). [1] As mentioned in abstract that we would be varying the Doppler shift in case of Rayleigh fading and will be explaining the observed variations in the generated output, its better to have an understanding of what Doppler shift actually means as well for better understanding of concepts. Doppler effect (or Doppler shift) can be described as the increase or decrease in Doppler frequency in case of a moving object (for e.g. the Doppler frequency increases when the object is moving towards the stationary or moving object and vice versa for moving away from the desired moving or stationary object). The mathematical expression for Doppler frequency can be given as; f = left( frac{v + v_r}{v + v_{s}} right) f_0 , Where Vr is the velocity of receiver relative to the medium and Vs is the velocity of source relative to the medium and V is the velocity of waves in the medium [2]. Also, Doppler power spectral density which is also an important parameter of Rayleigh fading is the measure of spectral broadening caused in the waveform characteristics of the transmitted signal (such that the received signals appears to be faded and broadened as compared to the actual signal sent). The mathematical expression for Doppler power spectral density can be shown as [3]; S(nu) = frac{1}{pi f_d sqrt{1 left(frac{nu}{f_d}right)^2}} Realization of Rayleigh fading using MATLAB A sample program of Rayleigh fading can be accessed in MATLAB 2010a by typing the command doc_qpsk_rayleigh_derotated in the command window. The MATLAB operator gives us a block diagram of the Rayleigh fading. It consists of a Bernoulli binary sequence generator, two QPSKs, one error rate calculator, one Rayleigh fading block (where adjustments regarding Doppler shift can be made), one phase removal of path gain block and in the end an AWGN block for simulation of faded signal (4). The screenshot of block diagram for Rayleigh fading had been shown below; Figure 1. MATLAB screenshot of the block diagram for simulating the Rayleigh fading 2.1 Simulation with basic values of Doppler shift and sample rate The simulation results into three possible outputs. These are transmitter output, Rayleigh channel output with no phase component and Rayleigh noisy channel output with no phase component. These outputs for sample simulation with bit sample rate/sec of 100logbase2 (M) and maximum Doppler shift of 1000 hertz is shown below. The screenshots of respective output of QPSK modulator output, Rayleigh channel output and noisy Rayleigh channel output has been shown below; Figure 2.screenshot of MATLAB simulated QPSK modulator output for Rayleigh fading Figure 3.screenshot of Rayleigh channel output for Rayleigh fading (simulated using MATLAB) Figure 4.screenshot of the noisy Rayleigh channel output for Rayleigh fading (simulated using MATLAB) 2.2. Simulation with changed values of Doppler shift and sample rate In the second simulation i have changed the values in Doppler shift and sample rate per second. The Doppler shift can be changed by changing masking parameters in the Rayleigh fading channel. Here, in this simulation I have kept the Doppler shift to 10000Hz while in previous case it was 1000Hz. Also, in Bernoulli bit sequence generator the value of samples per second had been changed to 1000logbase2 (M). The observed variations have been shown below. Figure 5. QPSK modulator output of the Rayleigh fading (simulated using MATLAB) Figure 6. Rayleigh channel output for the Rayleigh fading (simulated using MATLAB). Figure 7. Noisy Rayleigh channel output for Rayleigh fading (simulation using MATLAB) 2.3. Explanation of the observed variations It can be seen that in first case the outputs (amplitude) of QPSK modulator lies in the range of -1 to 0 and 0 to +1 while it varies from -2 to 0 and 0 to +2 which obviously should be observable as the samples per second gets increased from 1000 to 10000 samples per second. However, as the Doppler shift is increased the fading becomes more visible in case of the Rayleigh fading and noisy Rayleigh fading channels. The explanation can be given using Jakes model which relates the Doppler shift and Rayleigh fading. Jakes model relates the Rayleigh fading for kth wave to Doppler shift in following manner; R(t,k) = 2sqrt{2}left[sum_{n=1}^{M}left(cos{beta_n} + jsin{beta_n}right)cos{left(2 pi f_n t + theta_{n,k}right)} + frac{1}{sqrt{2}}left(cos{alpha} + jsin{alpha}right)cos{2 pi f_d t}right] Also, fn=fd(cosa) [5] Hence, it can be said that the amount of Rayleigh fading is directly proportional to the cosine of Doppler shift experienced by the transmitted wave. Also, worth mentioning over here is that is cosine decreases from 0 to increasing values of angle. It can be also seen that from expression mentioned above for power spectral density for Doppler shift that if the Doppler shift is increased the corresponding power spectral density is also increased. Thus, the results shown in the screenshots are explained and justified and it can be said that with the increase of Doppler shift the transmitted waves the Rayleigh fading is increased and so is the power spectral density related to it. Conclusion Rayleigh fading is an important phenomenon used to explain multipath fading in case of the dense populated areas. Rayleigh fading affects a transmitted signal by making broadened and faded in nature and it also does effects its power spectral density in a big way. Also, with increase in Doppler shift the Rayleigh is increased as well. In this setup, channel distortion parameters such as gain and phase are defined as a complex number consisting of real and imaginary parts. Thus, Rayleigh fading can be said to be composed of two paths (real and imaginary) and can be considered as independent paths which can be added in order to get net magnitude of Rayleigh fading occurred in the transmission [6]. To counter the effects of Rayleigh fading a number of techniques were used in the past but the most common one used these days is using a White Gaussian simulator for maintaining bearable effects of Rayleigh fading. This had been shown in the block diagram shown above. References Proakis John. G (1995).  Digital Communications  (3rd Ed.). Singapore: McGraw-Hill Book Co. pp.  767-768.  ISBN  0-07-113814-5 Rosen, Joe; Gothard, Quinn Lisa (2009). Encyclopedia of Physical Science. Infobase Publishing. p. 155. ISBN 0-816-07011-3., available on page 155 Clarke.H.R. (July-August 1968). A Statistical Theory of Mobile Radio Reception. Bell Systems Technical Journal, page number 957-1000 Arsal. A, Ozen. S(2008), A Rayleigh fading  ¬Ã‚ lter design for multipath Rayleigh fading simulation and comparisons to other simulators Jakes. C. Williams, Editor (February 1, 1975). Microwave Mobile Communications. New York: John Wiley Sons Inc. ISBN 0-471-43720-4. Proakis John. G (1995).  Digital Communications  (3rd Ed.). Singapore: McGraw-Hill Book Co. pp.  767-768.  ISBN  0-07-113814-5 Spread Spectrum Models Abstract Spread spectrum is a statistical modulation technique that is been used for increasing the available channel bandwidth. In this article we have focussed on the one the spread spectrum models i.e. two users real spreading with BPSK modulation using MATLAB. Also, a brief study of variations and the explanation of such observations are made in this article. Here, Ill be varying the SNR value of the AWGN block in the given block diagram for the spread spectrum model and would be observing and explaining the variations occurred. 1. Introduction Spread spectrum modulation is a type of modulation in which we intentionally increase the available bandwidth in frequency domain i.e. we stretch the available bandwidth. This leads to a broadened or widened signal for with increased bandwidth. This is generally done to increase bandwidth for signals that require more bandwidth for transmission (it has an effect similar to aliasing but the difference we take anti-aliasing measures against the later). The system models that use such spread spectrum techniques are called spread spectrum models. Two user model for real spreading with BPSK modulation basically utilizes two different orthogonal codes for spreading of the codes. The process of spreading is independent in nature i.e. a different pn sequence for each of the two users. This model uses the orthogonal frequency division multiplexing access technology (OFDM) for communication between the two users simultaneously. In this scheme, there are a large number of orthogonal sub carriers separated by a very small distance. The data is then divided into small but same sized chunks and then are loaded (modulated) on these orthogonal sub carriers through multiple paths [1]. The subcarriers then can use any of the conventional technologies for modulating these data packets (such as QAM or PSK) for transmission over the channel. Also, the symbol rates for individual data packets are maintained such that those comparable to its conventional counterparts. However, OFDM is more popular with wireless systems. 2.1. Realization of spread spectrum model using MATLAB Two user orthogonal real fading with BPSK can be realized in MATALAB by typing commspreading_orthobpsk2u in the MATLAB command video. The result shown on the MATLAB simulation window is a block diagram of two user real spreading with BPSK. The screenshot of this has been shown below; Figure 1- Two-user orthogonal real spreading with BPSK modulation (simulated in MATLAB) As shown in the block diagram here the system setup can be broadly classified into three sections. These are transmitter section, the channel and then receiver section. Receiver section is further extended into one more section known as error calculation section. Let us have a brief look into each of the sections mentioned above. 2.1.1 Transmitter section The transmitter section is responsible for transmitting signals to receiver section via channel section of the system setup. Transmitter section is basically made up 5 major components, these are Random integer (signal generator), real BPSK modulator, Hadamard code generator, normalized gain and spreader blocks. Random integer block is used for the generation of signals that could be used for sending over the channel. These signals are then BPSK modulated where it is also mixed with the actual user signals and sent to spreader section. The sequence generated is of 64 bits length. Then on the lower side of the transmitter contains Hadamard code generator which generates unique Hadamard codes for the signals encryption and security to protect it from hacking and noise addition over the channel. The gain of the Hadamard code is then normalized and mixed with the BPSK modulated signal in the spreader section. The spreader is responsible for the deliberate spreading of signals in the frequency domain to increase the bandwidth of transmitted signal. 2.1.2. Channel section Channel section here refers to actual channel or medium through which transmission is done. But here its not wireless as it is an experimental setup. This section here contains AWGN correction blocks. These are responsible for deciding SNR values for the transmitted signals as to gain knowledge about the actual signal transmission through wireless medium. Here, a person can set values of SNR such that to determine the low and high noise environment and the results of these variations of the error rate at receiver section. 2.1.3. Receiver section The receiver section is responsible for the reception, decryption, de-spreading and calculation of error rate in the received signals after travelling through the physical medium. The process carried out here is just opposite as of transmitter section of the setup. The received signal is first sent to de-spreader for removing the spreading done in transmitter section. The integrator and dump section is used to detect or separate out RZ and NRZ parts of bit sequence [3]. Then the sequence is sent to demodulating BPSK section and then to error rate determination section for error rate estimation. 2.2. Effects of Variations in SNR on the Error rate The effects of variations of SNR on the error rate have been summarized below. The table below shows the variations in values of SNR and the corresponding changes in error rate i.e. eRx/Rx (number of erroneous bits transferred /total bits received [2]) with de-spreading. Also, worth mentioning here is that the time period for which the simulation is carried by the system is set to 0.125 seconds in this sample spread spectrum modulation. The table is as under; Figure 2. Table above depicts the effect of variation of SNR on the error rate of the system setup explained above (all values are realized in MATLAB and written down in the table) The table above shows that with increasing values of signal to noise ratio the value of bit error rate is reduced. But it is different in first two readings for receiver1 and receiver2 while it ends out to be zero for SNR value 100 dB for all of the values simulated in a time defined range of 0.125 seconds. This pretty understandable that the dispreading used is here is of ideal nature thus the value of erroneous bits goes down as value of SNR increases. The difference in the error rates between the first two readings of receiver1 and receiver2 is pretty understandable as the two different signals have different error rates when they are transmitted through two different Hadamard codes (i.e. initial seed for first receiver was set to 37 and for second it was set 631). 3. Conclusion Two user orthogonal real fading with BPSK modulation is used as an experimental to study the characteristics of spread spectrum. The OFDMA as we know splits the large data into small equally sized fragments and transmits it through multiple paths thus is also affected by multipath fading. This particularly affects wireless channels even makes is even more difficult to maintain SNR and low error rates. To counter the effects AWGN simulator is used such that the effects of multipath fading are neutralized. The observations made with this system setup prove that value of SNR affects the error rate percentage in the transmission. As the value of SNR is increased the value of error rate goes down and vice versa for a lower value of SNR. References 1. Robertson. P; Kaiser .S; The effects of Doppler spreads in OFDM(A) mobile radio systems, Vehicular Technology Conference, 1999. VTC 1999 Fall. IEEE VTS 2. Shah .Gaurav ; Molina. Andres ; Blaze. Matt (2006); Keyboards and Covert Channels 3. Sadr, R.; Hurd, W. J.; The Telecommunications and Data Acquisition Report, page 158-173 (ISBN N88-12679 04-32) 4. Aurthur. Ross (1997); CA Patent 2228131; data available on http://www.mathworks.com/products/commblockset/demos.html?file=/products/demos/shipping/commblks/commspreading_m.html#1 5. MATLAB code available at http://www.mathworks.com/products/commblockset/demos.html?file=/products/demos/shipping/commblks/commspreading_m.html#1 IEEE 802.11 WLAN Abstract IEEE 802.11 is the standard adopted by IEEE for design of wireless network systems. Here, in this article a sample simulation of 802.11 standard is done using MATLAB and Simulink. Also, a brief description of operation and functional characteristics of blocks (i.e. components) used for attaining and maintaining wireless networks have been made. Also, certain parameters of WLAN system setup are varied to make a brief study of changes that incur in the system due to these variations. 1. Introduction Secure, dependable and fast wireless systems have become a need of current growing world that touches everyone ranging from individuals to large organizations. Wireless networks are needed for small private area networks such as Bluetooth and Ad Hoc and large networks for wider network coverage such as 3G and 4G networks are currently being employed for providing internet and communication services to people with mobility. The WLAN 802.11 standard is used for wireless communication networks in 2.4, 3.6 and 5 GHz frequency bands [1]. There is a complete family of 802.11 which uses a number of over the air modulation techniques for transmission and reception of signals. There a number of versions launched by IEEE under the name of 802.11, this includes 802.11a, 802.11b, 802.11g and 802.11n. The most frequently employed among these are 802.11b and 802.11g. The data to be transmitted is first broken in small and equally sized packets and then modulated and transmitted on multiple channels (through different paths) to the destination. Thus, it uses OFDMA access for setting up communication. 802.11 standard has a complete frame stack for secure and dependable communication. These include certain frames for controlling and maintaining the wireless connection among wirelessly connected hosts. These are Protocol version, Type, Sub type, ToDS and FromDS, More fragment, Retry, Power management, More data and WEP [2]. All these play important part in setting, maintaining, controlling and releasing the wireless connection among a number of wirelessly connected hosts on 802.11 system. Below is shown a sample example of how 802.11 WLAN standard system looks like. Figure 1. The Linksys WRT54G contains an 802.11b/g radio with two antennas [3]. 2.1. Realization of IEEE 802.11 WLAN standard in MATLAB A sample MATLAB program for IEEE 802.11 WLAN can be realized in MATLAB by typing the same in help command box of the MATLAB. The output shows an experimental setup containing block diagram of the IEEE 802.11 WLAN system. This has been shown below. Figure 2- The screenshot above shows the block diagram of the sample IEEE 802.11 WLAN standard simulated in MATLAB The block diagram broadly contains variable-rate data source, BPSK modulator and demodulator, OFDM symbol generation block and disassemble OFDM frame block, multipath channel and a packet error calculation block. Also, the signal visualization block for opening the signal characteristics of such setup. These signals characteristics are shown below. Figure 3-The signals transmission and receiver characteristics of the 802.11 system setup using sample settings (simulated in MATLAB) 2.2. Operations and working of the Block diagram The signal characteristics can be visualized in the above screenshot. The transmitted data consists of a binary stream of data send with OFDMA modulation. In this model shown above the variable rate data source is used to generate a binary string of variable data rates which could be considered as similar to the real life scenario as data rates vary with time and need of the users. This binary string is then BPSK modulated using BPSK modulator which is the case with OFDMA as it uses any other general modulation technique for the modulation of signals and then OFDMA codes are added to it. The signals are now undergo a number of alterations before reaching the multipath channels. These include adding a cyclic code to the signals and going through IFFT which is inverse fast Fourier transform to the signal. The signals are then sent through multiple paths which is the case with the OFDMA. This completes transmitter section. After all these processes the signal enters the receiver section of the WLAN. The signals go through cyclic code removal block and then FFT or fast Fourier transform block to anti the effects of IFFT. Then signals are equalised in frequency domain as these get disturbed in frequency domain as shown in the figure 2 signal equalization. The disassemble OFDM block takes off the OFDM codes from the signals and then the signals is demodulated using a BPSK demodulator after which the signal output is sent to the error collection block where the original and received signals are compared to get error rate in the transmission. Also, one more output wire goes to adaptive modulation control block where the degree of modulation is controlled according to the bit error rate achieved by the system. Also, the value of SNR is varied according to the values entered in the stack. This also changes the adaptive modulation control. 2.3. Effects of variations in certain parameters of IEEE 802.11 WLAN setup The effects of inducing variations in certain parameters such as SNR or hysteresis are visible in the transmission characteristics of the block diagram shown below. These values are achieved after changing the value of hysteresis value for adaptive modulation to 10dB from 3dB and lower SNR threshold values to [10 11 14 18 22 24 26 32] decibels from earlier value of [10 11 14 18 24 26] decibels. It can be seen from the two figures 3 and 4 that the unequalized signal spreads out more. Also, the per i.e. packet error rate is increased from 6% to 12%. This due to increased hysteresis for adaptive modulation control. Conclusion The IEEE 802.11 standard for wireless LAN is used as a standard for setting up the wireless network for communication of multiple numbers of hosts. Also, in this sample simulation we concluded that with varying values of SNR and hysteresis the BER and PER also changes. Thus, it can be also concluded that data rates and packet loss rates are also variable at variable places in the parts of networks. This due to different distances, landscapes and congestion is different for different areas as the signal transmission follows multiple paths for transmission and every single path has a different type of obstacles available. Also, the system is greatly affected by noise present in free space. The reception quality always decreases with increase in distance between the service provider and host.

Essay on Setting in Poes The Masque (Mask) of the Red Death :: Mask Masque Red Death Essays

Use of Setting in The Masque of the Red Death  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   "...In the black chamber the effect of the fire-light that streamed upon the black hangings through the blood-tinted panes was ghastly in the extreme, and produced so wild a look upon the countenances of those who entered, that there were few of the company bold enough to set foot within its precincts at all" (210). This quote serves to demonstrates Edgar Allan Poe's descriptive abilities. In "The Masque of the Red Death" Poe gives much detail about the setting. Poe uses detail about the setting to make the story believable, to add irony to the story, and to create an atmosphere appropriate for the appearance of the "Red Death."    In retrospect, "The Masque of the Red Death" is not a vary believable story. However, Poe's description of the setting presents the reader with such a realistic image of the scene that the reader cannot help but believe the story when first it is first read. The reader is manipulated by the author into believing that the story could actually be true. Poe accomplishes this manipulation by describing the setting in great detail. Seemingly half of the story is setting, rather than actual action. Poe begins with description of the 'Red Death,' proceeds to describe the 'castellated abbey,' and finally the 'imperial suit.' By paying such close attention to detail, the author has created a believable image in the mind of the reader. The creation of such believable aspects of the story is important. Within this believable image, the unbelievable arrival of the masked figure (the "Red Death") gains credibility. Without such believable aspects, the arrival of such a presence would not be credible.    Poe uses setting to create irony in the story. The description of the castellated abbey includes the facts that, "a strong and lofty wall girdled it," and that the gates had been welded shut (209). Both the high wall and the welded gates were intended to keep the Red Death out of the castle, when, ironically, they actually trapped it inside. Poe leaves clues to the reader that this may occur. He includes the statement that the welded gates prevent "egress" as well as "ingress." Furthermore, a girdle is typically used to hold something in, rather than keep something out.

French Rev

THE FRENCH REVOLUTION PAST YEAR ESSAY QUESTIONS No. | PAPER| ESSAY QUESTION| 1| O/N 2001| Why did Louis XVI fail to satisfy the demands of the revolutionaries in France during the period 1789-1793? | 2| M/J 2002| Why did the French revolution become increasingly radical during the years 1789-94? | 3| O/N 2003| Which of the grievances of the Third Estate in France in 1789 were the most important? Explain your answer. | 4| O/N 2004| How far and why did the aims of revolutionaries in France change during the period from 1789 to 1793? 5| O/N 2005| Why during the period 1789 to 1793 did Louis XVI fail to satisfy the demands of the French revolutionaries? | 6| M/J 2006| From 1789 to 1799, who posed the more dangerous threats to the French Revolution: its internal or its external enemies? | 7| M/J 2007| Why did Louis XVI’s policies from 1789 fail to prevent his execution in 1793? | 8| O/N 2008| Why did the French ancien regime collapse in 1789? | 9| 0/N 2009/(11)| ‘The economic difficulties of France in 1789 were more serious than the political problems. How far do you agree with this judgement? | 10| O/N 2009/(12)| How far, and why, did the aims of the revolutionaries in France change during the period from 1789 to the execution of Louis XVI in 1793? | 11| M/J 2010/ (13)| ‘The most important problem of the French ancient regime was poor quality leadership. ’ How far do you agree with this judgement? | 12| O/N 2010/ (11)| Why did the rulers of France from 1789 to 1799 fail to hold on power? 13| O/N 2010/ (13)| Why did the summoning of the Estate-General in 1789 not solve the problems of the ancient regime? | 14| M/J 2011/(11)| Why was Louis XVI executed in 1793? | 15| M/J 2011/ (13)| Did Robespierre and the Jacobins do more to save or to endanger the French Revolution? | 16| O/N 2011/ (12)| Explain the rise and fall of the Jacobins in France during the period from 1789 to 1794. | 17| O/N 2011/ (13)| Why were the attempts to reform the ancient regime in France up to 1789 unsuccessful? |

Education-Benchmark Assessment Essay

Several theories explain the concept of Early Childhood Education (ECE). Deiner (2013) describes that all of them share the same opinion that an early childhood educator is extremely essential in the development of a child’s intellectual and educational abilities. It is also commonly agreeable among the theories that the early childhood education can have a great impact in the life of an individual since education is progressive, and each stage leads to a higher one. However, there are some contradictions in the theories, which regard to some aspects of ECE. For instance, some studies feel that the intellectual development depends on the genes of the child as acquired from the parents. Other studies hold a different opinion, that the environment plays a great role in ECE. Some assert that both the environment and the biological play a great role in early childhood development. This study is based on the fact that the educator is part of the environment in which the child is subjected to, and all children can learn. The educator has several roles that make them have a great impact on a child. An early childhood educator has the responsibility to ensure that a child gains as much knowledge as possible depending on the level of the child, where the level is to a large extent determined by the age of the child. A child spends most of the waking time with the educator. There are differences presented by the various personalities of children. As a result, each child should be treated differently from the other by the educator. As a result, the educator needs to have sufficient knowledge on how to  understand each child, so that each child gains maximally. The educator defines the environment in which a child lives in school. It is agreeable that children have some common interests. For instance, most studies point out that using objects in educating children in grade three or lower can have on enhancing their knowledge by having them relate to things they frequently use. This means that the environment needs to have various objects and pictorial presentations for more effective learning. There are other considerations that the educator needs to be aware of, such as ensuring that the relationship among students themselves and between the educator and children is supportive to the education to be acquired. An early childhood educator deals with children who might not be much exposed, and they are open to what they are learn. It is clear from this essential role of educators that they should be having some personal characteristics. Grotewell & Burton (2008) explains that one of them is that the educator should be role model to the children. In addition, the educator should maintain a healthy lifestyle since children are much vulnerable to communicable illnesses. The use of clear communication is also relevant, not only to convey information to the children, but also because it can affect the children’s communication skills as well. Moreover, the educator needs to work closely with the children, their parents and the fellow educators so that they can learn more about each child. This means that sometimes they are involved in settling conflicts between the children and families. The role as the professional in the teaching and learning of children is achieved through several ways. One of them is by the educators developing and implementing programs that are designed to meet the children’s physical, intellectual, social, emotional, developmental and cultural needs and interests. The programs are basically considerate on a play environment. The programs also consider the age of the children. The educator can improvise some of the equipment that can be needed by the children. Secondly, the role can be attained by building the children’s interpersonal and social skills. Positive self-concept can also be achieved by having the educator  establishing positive guidelines that let the children to feel comfortable, safe and secure. Third, as aforementioned, constant communication with the other stakeholders in ECE, mostly the parents, should be considered. Forth, activities that actively involve the children ensure that the children gain maximally. Such activities could include outdoor play, various play experiences, snacks and meals as well as field trips (Deiner, 2013). The child educator also plays a role as an advocate on behalf of children. The educator is expected to understand children in general. Sometimes, children can be presented by challenges that they cannot easily express verbally to the relevant authorities. This means that they can suffer silently over issues such as domestic violence, bullying and lack of basic commodities. The educator has sufficient knowledge to realize a child who is having some pressing issues. Some children can gain the confidence and trust to open up to the educator, virtues that the educator should possess. The educator could as a result gain information that could not be realized by the parents and other people close to the children. Bhavya (2007) feels that children might not be sure on how to approach these issues. Some may be living in fear of exposing how they feel. However, the educator is in a better position to assist. For instance, the educator can ensure that the bullies in the educational institution are warned against it in the best way possible. The educator can be aware on how they can assist when cases of violence where a child is a direct or indirect victim are presented, such as involving lawful measures as well as talking with the parents and guardians of the children. Children whose parents cannot sufficiently offer basic needs can have their needs sought from other sources. Therefore, the educator represents the children in cases where the child might be unable to express themselves. Educators should work with the mentality that all children can learn. Learning involves various aspects of gaining knowledge, and not exclusive to study of books. It involves interpersonal and communication skills. Children are also expected to learn values that are generally acceptable in the society. Each child consequently needs to learn. In addition, each child has  the capability to learn. Although there can be variances in the capabilities, children are able to continually gain knowledge on the aspects noted. The educator should understand how much each child can contain. Moreover, it is relevant to know exactly what a child needs in order to learn. For instance, some children could require frequent reminders and assignments so that they can understand some concepts (Grotewell & Burton, 2008). As the different aspects of learning are concerned, there needs to be various assessments to test the success of each. Apart from the writing and reading skills, tests such as etiquette, posture and arts can be conducted regularly. Although the tests might not be recordable, an educator who clearly understands each of the students can clearly tell whether there is progress in the development of a child. The assessment practices should ensure that the children gain from the basics to the complex contents so that all children can learn (Bhavya, 2007). Technology currently plays a role in the education to young children. Educators are increasingly using technology due to the several benefits it has in enhancing gaining of knowledge among them. There are equipments that have been developed with an aim to create fun as children learn. For instance, counting machines are attractive to the children, and they can enjoy using it. The technologically developed equipments are also safe and easy to use. This means that the children can learn some things on their own after being guided by the educator. Some technology can be used in displaying information that could not be better displayed in any other means. Photos that are presented in screens can be relevant in showing children objects that can help them to learn. Technology also reduces costs in teaching children. For instance, a trip to view some objects in far places can be avoided by having the objects displayed. Therefore, technology is significant in teaching children (Morgan, 2011). The environment is crucial in the teaching and learning among children  between birth and grade three. It affects the emotional, intellectual, psychological and physical aspects of a child. The environment concerns several things, but most importantly the people who interact with the children. The environment should support learning, and it could contain learning inhibiting factors, or can contain motivating ones. If the environment does not support learning, the child cannot concentrate. Children are much likely to put more focus on issues that constantly happen to them. For instance, if they are being physically or emotionally abused, they cannot gain much in the learning process (Morgan, 2011). Children are much motivated by some aspects in the environment. One of them is the availability of ample playing space. Since the children gain a lot when playing, space and equipment provided by the environment can enhance their learning greatly. The environment can also be motivating by just being safe for the children. Therefore, the environment is crucial in the learning of children. References Bhavya, M. S. (2007). _Early childhood education_. Delhi [India: Kalpaz Publications. Deiner, P. L. (2013). _Inclusive early childhood education: Development, resources, practice_. Belmont, CA: Wadsworth Cengage Learning. Grotewell, P. G., & Burton, Y. R. (2008). _Early childhood education: Issues and developments_. New York: Nova Science Publishers. Morgan, H. (2011). _Early childhood education: History, theory, and practice_. Lanham, Md: Rowman & Littlefield.

Capital punishment -Criminals Need the Death Penalty essays

Capital punishment -Criminals Need the Death Penalty essays Is the death penalty fair?. It is a very controversial subject discussed by the experts. Has any one of these individuals listened to the rest of us? The answer in many cases is no. Australia and Americas Governments represent the people, their wishes, beliefs and ideals. That means, through elections, we decide what policies are to be passed. In the case of capital punishment, various polls report that seventy percent of Americans are in favour of the death sentence. That is a clear majority. So called experts are free to appeal this is wrong and speak freely. But the fact of the matter is seven out of ten Americans have calculated the problem of capital punishment according to their own values and beliefs. Their conclusion was favourable to the death penalty. The question of it being fair was answered by the majority - and the majority rules. Many experts who speak against the death penalty refer to it as barbaric. The definition of murder, is "the unlawful killing of a human being with hatred ." This is true but that is what a killer has done. Everyone should know that if you kill or rape then the death penalty is the punishment for the crime. If the person willingly committed the terrible act of taking a life, he would know that he would be subject to this penalty. Therefore, he decided to gamble on not being caught, or thought that he was above the law. In either case he willingly gave up his life with the taking of another. Critics argue that an innocent person may be put to death, and most agree this may happen. However, we must protect the people of this country from killers, and we have tried all other options. The trial court imposes death only after a post-conviction hearing, during which circumstances of the crime are reviewed. The accused may also appeal the decision or request a stay of execution as he sees fit. Although the risk of an accidental death is there, the legal actions are i ...

Bmw International Marketing Essays

Bmw International Marketing Essays Bmw International Marketing Essay Bmw International Marketing Essay The BMW Group has been very successful in achieving international status. There are three brands within the entire BMW group: BMW, MINI, and Rolls-Royce Motor Cars. The entire group is committed to providing high quality with all of its products as well as its services. There have been many defining moments in the History of the BMW group. The group was founded in 1916, and was originally called Bayerische Flugzeug-Werke (BFW), standing for Bavarian Aircraft Works. In 1917 the company was renamed Bayerische Moteren Werke (BMW), standing for Bavarian Motor Works. The company constructed a plant in Munich and built engines for military aircraft there until 1918. BMW established plants over Germany that eventually underwent rapid expansion for the volume production of aircraft engines. In 1939, the BMW company took over Brandenburgische Motorenwerke, based in Berlin, Germany. After WWII, the Munich plant had many serious damages from the air raids. In 1945, the US military government issued orders that the plant in Munich had to be dismantled. This caused BMW to lose control over its assets for at least four years, in other locations, even longer. In 1948, the first volume-production motorcycle was sold in another country, and by 1950, motorcycles were already being exported. By 1967, The BMW Munich plat was no longer the largest plant in the world. Dingolfing took over the title after Munich reached its capacity. In 1972, a BMW importer in South Africa seemed to be having issues with potentially facing bankruptcy. The Board of Management then set up a factory in South Africa which became the first production plant outside Germany. BMW gradually took over sales from all of its key markets with importers, starting with France. This was set up to protect profits, as well as to help grow European integration. In 1977, Berlin had a new BMW factory built, and six years later they opened their doors for manufacturing car components as well as motorcycles. BMW decided to build a car plant in the USA in 1992 which therefore branded themselves as a global company. The production of the Z3 roadster was opened in 1994 in Spartanburg, South Carolina. This vehicle was exported all over the world from Spartanburg and eventually the location extended production facilities for the BMW X5. In 1994, BMW purchased the British-based Rover group which contains the brands Rover, Land Rover, MINI and MG. Later, in 1998, Rolls-Royce was acquired by BMW from Volkswagen. The BMW group did not have the rights to vehicle factory until 2003. From 2000 onwards, the Rover group ad lost almost half of their revenue and the costs of restructuring the company had been quite expensive. The BMW Group sold Rover and MG for ten pounds, and later sold Land Rover. The MINI brand is currently still retained by the BMW Group. The entire group has been focused in the international car market since the 2000s, and has their sights set firmly on the premium sector. The company’s objective is clearly defined as â€Å"The BMW Group is the leading provider or premium product s and premium services for individual mobility. †

Application of Discounted Cash Flow

As per the ratio analysis determined from the financial statements of TNO Limited, it can be said that the net profit ratio of the company declined in the current unaudited period compared to that of the previous year by around 9%. Similarly, return on assets of the company also declined by around 10%, which indicates that the capacity to generate revenue from the assets is not sufficient. Working capital ratio of the company reflected 1.91, which was higher in the previous audited financial year indicating that the value of assets has been declined in the current year to meet the current liabilities. According to the financial statements of the company, it can be said that the net income reflected declining trend in the current financial year. It has been observed that the revenue of the company also reflected 58% decline compared to that of the previous year 2009 indicating reduction in the overall expected rate of return. During the current financial year, it has been noticed that the solvency ratio of the company declined in the current year, which was 0.50 in the previous audited period that may lower the return on investment and increase the cost of capital structure (Knechel & Salterio, 2016). On the contrary, liquidity ratio of the company reflected increased value in the current financial year, which reflects the ability of the company to convert resources in cash within short- term period (Lu, Wu & Yu, 2017). Considering the non- current assets of the company, it can be said that the value of investments has been increased in the current year. Increase in value of investments has been measured through properties, which was valued by directors as per the basis of financial year 2010 (Kou, Peng & Wang, 2014). Accordingly, it can be said that the investment valuation of the company reflected risk of decline in market value that may affect the true and fair view of the assets value. In addition, the account of intangible asset valuation reflects significant risk of correct valuation, appropriate amortization charges and value as per the current and fair market rates (Uechi et al., 2015). While planning and performing analytical procedures, it is essential to measure the significant risk present in the financial statements to assess the materiality and relevance of the financial performance of the company. In the present case, the areas that have been considered for significant risks are investments and intangible assets other than overall income statement and balance sheet. The investment account has been identified for significant risk since it covers a significant area of company’s asset and overall financial position. It is essential for a company to measure the appropriate and correct value of investments in accordance with the fair market value (Delen, Kuzey & Uyar, 2013). In case of TNO Limited, investment of surplus funds and property market is principal business activities therefore it is essential to conduct appropriate audit test on the value of investments. It is important to conduct detailed valuation of the investment together with the current mar ket value as well as interest rates along with the verification of accounting records of investment. On the other hand, valuation of intangible assets has been considered since it involves a significant area in the company’s overall asset resources. Since, TNO limited has been involved in research and development of technologies, it is essential to consider appropriate value of intangible assets as per the current market structure. Delen, D., Kuzey, C., & Uyar, A. (2013). Measuring firm performance using financial ratios: A decision tree approach.  Expert Systems with Applications,  40(10), 3970-3983. Dudzi?ska-Bary?a, R., & Michalska, E. (2015). Visualisations of the risk investment valuation and the level of inventory control using the GeoGebra software.  Studia Ekonomiczne,  247, 7-19. Knechel, W. R., & Salterio, S. E. (2016).  Auditing: assurance and risk. Routledge. Kou, G., Peng, Y., & Wang, G. (2014). Evaluation of clustering algorithms for financial risk analysis using MCDM methods.  Information Sciences,  275, 1-12. Lu, L. Y., Wu, H., & Yu, Y. (2017). Investment-related Pressure and Audit Risk.  Auditing: A Journal of Practice and Theory. Mohammed, M. I., Omirin, M. M., Singhry, I. M., & Auwal, U. (2016). Application of discounted cash-flow (DCF) models in the valuation of investment properties in Nigeria.  International Journal of the Built Environment and Asset Management,  2(1), 25-36. Uechi, L., Akutsu, T., Stanley, H. E., Marcus, A. J., & Kenett, D. Y. (2015). Sector dominance ratio analysis of financial markets.  Physica A: Statistical Mechanics and its Applications,  421, 488-509.