Ku Klux Klan The Ku Klux Klan, Or KKK As Known Today, Was Started In T

"Ku Klux Klan" The Ku Klux Klan, or KKK as known today, was started in the spring of 1866. Six Confederate veterans formed a social club in Pulaski, Tennessee. This KKK only lasted a short six years, but left tactics and rituals that later started in generations. (Ingalls, 9) The Klan was a small group very much in secrecy at first. The exact date of the beginning is unknown. Despite all of the secrecy the six KKK members initiated new members to join their social club. (Ingalls, 9) A year after the creation of the KKK, the onetime social club joined the raising campaign against the Republican Reconstruction. The "new" direction of the Klan was well planned and organized. The Klan was now ready to expand to a bigger group. The Klan adopted a prescript. This was an organizational structure permitting the Klan to spread across the south. New members had to be over 18, pay $1, sworn to secrecy, recruits pledged to "protect the weak, the innocent, and the defenseless, fro m the indignities, wrongs, and outrages of the lawless, the violent, and the brutal." The highly centralized plan for expanding the KKK, spread so rapidly that most chapters operated alone. The founders of the KKK lost control, and it became impossible to talk about a single KKK. Yet Klan activities still followed a common pattern throughout the south. (Ingalls 11-12) The Klan now started to spread across Tennessee. At first the Klan used tricks to keep blacks "in their place". At first, the Klan would ride around on horses, and with their white robes, and white pointed masks, try to scare blacks. They would try to act like ghost with their white uniforms. Unfortunately, the Klan quickly moved to more violent pranks. (Ingalls, 12) The Klan would now suppress blacks. The Klan leaders proved unable to control their followers. Although the violence was often random, there was a method in the madness. The victims were almost always black or if white, associated with the hatred of the Republican party. The Klan had fear of black equality and sparked attacks on schools setup for freed slaves. The Klan would warn the blacks not to attend school, and would scare the teachers, most from out of state, to leave town. (Ingalls 12-13) Many groups started forming around the south called the Ku Kluxers. The Klan was being noticed as "The Invisible Empire". However and wherever Klan's were formed they all followed the same pattern set by the Tennessee Klan. The Klan became the greatest terror in 1868, when their attacks were against Republicans and elect democrats. Thousands of blacks and whites fell victim to the murders and beatings given by the KKK. (Ingalls, 13) In 1869, General Forrest, the Grand Wizard of the KKK ordered Klansmen to restrict their activities. The Klan was getting out of control, and Congress passed a Ku Klux Klan Act in 1871. By the end of 1872, the federal crackdown had broken the back of the KKK. Because of the restriction and the Act passed violence was isolated but still continued. The KKK was dead, and Reconstruction lived on in southern legend . This would not be the last of the KKK. On the night of Thanksgiving in 1915, sixteen men from Atlanta, Georgia climbed to the top of Stone Mountain and built an altar of stones on which they placed an American flag. They then stood up a sixteen foot long cross and burned it. One week later, this group applied for a state charter making it "The Knights of the KKK, Inc." This was put in effect during the Reconstruction. The new Klan at first received little attention. Only in time, it became the biggest and most powerful Klan in history. Klan membership was limited to native-born, white, Protestant American Men. The Klan message was clearly to appeal to people who were troubled by abrupt changes in American Society. (Ingalls, 16-17) Many believe that the biggest growth of the KKK began when Colonel Simmons, considerably the founder of the new KKK, linked u p with Edward Young Clarke and Elizabeth Tyler. In June 1920, Clarke and Simmons signed a contract that guaranteed Clarke a share of

Admissions Data and Profile for Phillips Exeter Academy

Admissions Data and Profile for Phillips Exeter Academy John and Elizabeth Phillips established Exeter Academy on May 17, 1781. Exeter has grown from those humble beginnings with only one teacher and 56 students to become one of the finest private schools in America. Exeter has been fortunate over the years to receive some remarkable gifts for its endowment, one of its sources of funding. One gift, in particular, stands out and that is the donation of $5,8000,000 in 1930 from Edward Harkness. The Harkness gift revolutionized teaching at Exeter; the school later developed the Harkness method of teaching and the Harkness table. This educational model is now used in schools around the world.   The School at a Glance Founded 1781- One of the 15 Oldest Boarding Schools in the USNumber of students: 1079Grades: 9-12Number of faculty  members: 217; 21% hold doctoral degrees; 60% hold masters degreesTuition and fees start at: $50,880 for boarding students, $39,740 for day studentsPercentage of students receiving financial aid: 50%Acceptance Rate: ~16%Admissions Deadline: January 15Financial aid materials due: January 31Admission Decisions Released: March 10School Website: Phillips Exeter Academy As you drive into the scenic colonial town of Exeter in southern New Hampshire, you are quite aware that Exeter, the school, greets you from every quarter. The school dominates the town at the same time as it draws the town into its community and life. The Academic Program Exeter offers over 480 courses in 19 subjects (and 10 foreign languages) areas taught by a superb, highly qualified and enthusiastic faculty numbering 208, 84 percent of whom have advanced degrees. Student stats of note: Exeter enrolls more than 1070 students each year, approximately 80 percent of whom are boarders, 39 percent  are students of color and 9 percent are international students. Exeter also offers over 20 sports and an astounding 111 extracurricular activities, with afternoon activities of sports, arts, or other offerings being required. As such, the typical day for an Exeter student runs from 8:00 am until 6:00 pm.   Facilities Exeter has some of the finest facilities of any private school anywhere. The library alone with 160,000 volumes is the largest private school library in the world. Athletic facilities include hockey rinks, tennis courts, squash courts, boat houses, stadia, and playing fields. Financial Strength Exeter has the largest endowment of any boarding  school in the United States, which is valued at $1.15 billion. As a result, Exeter is able to take very seriously its mission of providing an education for qualified students regardless of their financial circumstances. As such, it prides itself on offering ample financial aid to students, with approximately 50% of applicants receiving aid that totals $22 million annually. Technology Technology at Exeter is the servant of the academys vast academic program and community infrastructure. Technology at the academy is state of the art and is guided by a steering committee which plans and implements the academys technology needs. Matriculation Exeter graduates go on to the finest colleges and universities in America and abroad. The academic program is so solid that most Exeter graduates can skip many freshman year courses. Faculty Nearly 70% of all faculty at Exeter resides on campus, meaning students have ample access to teachers and coaches should they need assistance outside of the normal school day. There is a 5:1 student to teacher ratio and class sizes average 12, meaning students get personal attention in every course.   Notable Faculty and Alumni Alumnae Writers, stars of stage and screen, business leaders, government leaders, educators, professionals, and other notables litter the glittering list of Exeter Academy alumni and alumnae. A few names that many may recognize today include Author Dan Brown and US Olympian Gwenneth Coogan, both of whom have served on the faculty at Exeter. Notable alumni include the Founder of Facebook Mark Zuckerberg, Peter Benchley, and numerous politicians, including US Senators and a US President, Ulysses S. Grant. Financial Aid Qualified students from families making less than $75,000 can attend Exeter free of charge.  Thanks to Exeters impeccable financial record, the school prides itself on offering ample financial aid to students,  with approximately 50% of applicants receiving some form of aid that totals $22 million annually. An Appraisal Phillips Exeter Academy is all about superlatives. The education which your child will get is the best. The philosophy of the school which seeks to link goodness with learning, though it is over two hundred years old, speaks to twenty-first-century young peoples hearts and minds with a freshness and relevancy which is simply remarkable. That philosophy permeates the teaching and the famed Harkness table with its interactive teaching style. The faculty is the best. Your child will be exposed to some amazing, creative, enthusiastic and highly qualified teachers. The Phillips Exeter motto says it all: The end depends upon the beginning.   Updated by Stacy Jagodowski

Immediate and Continuing Care at the Surgical Department Essay

Immediate and Continuing Care at the Surgical Department - Essay Example During the post-surgical operation, part of my duty includes monitoring the patients for signs of shock, ensure that the patients’ surgical wound is free from infection, and manage the patients’ post-operative pain. At all times, surgical nurses should be able to deliver holistic care to the patients. It means that part of the duty of surgical nurses is to satisfy the pathophysiological, socio-economic, psychological and spiritual dimensions of healthcare. For this reason, it is equally important on the part of surgical nurses to carefully study and re-examine the health and socio-economic consequences of using a prolonged peripheral IV line and the possibility of generating avoidable infection out of using these devices. When I was assigned to care for Mr. Phillip, part of my duty was to regulate his IV line. While regulating his peripheral IV line, I started to wonder how often nurses should change their line to prevent the risk of IV line infection (ONE PROBLEM IDENT IFIED... Delete this part). Is it really safe to extend the patient’s peripheral IV catheter line for up to 96 hours? What does the NHS say about extending the patient’s peripheral IV catheter line from 72 to 96 hours? When exactly is the right time for surgical nurses to change the patients’ peripheral IV lines? To address these research questions, a literature review be conducted based on some peer-reviewed journals. Using search words and phrases like â€Å"health consequences of prolonged peripheral IV line journal†, â€Å"NHS peripheral IV line†, â€Å"hand washing IV line infection†, and â€Å"peripheral IV line 72 96 hours journal†, the researcher will gather evidenced-based journals directly from the databases of NCBI/Pubmed, Medline, and Pubmed Central. Based on the actual literature review, a proposed change will be highlighted in this study followed by describing its actual contribution to the nursing practice, the rational e underpinning the proposed change in patient care, alternative strategies and reasons underpinning the final choice of action, ways on how the proposed change in patient care can be evaluated, and its expected outcomes. Prior to the research study conclusion, the ethical and legal considerations behind the implementation of the proposed change will be tackled in details. Literature Review Intravenous catheterization is one of the most common invasive intravenous procedures being performed in patients who were admitted in a hospital. Basically, the main purpose of administering intravenous fluids on admitted patients is important in terms of promoting electrolyte balance in the human body, for rehydration purposes for patients who are dehydrated due to prolonged diarrhoea, to provide the patients with glucose (dextrose) to increase the body’s metabolism, and administration of water-soluble vitamins and other medications like antibiotics into intravenous line. (Morgan, Range, & Staton, 2007; Kozier et al., 2004, p. 1387). Since IV line insertion is invasive by nature, patients who are receiving IV fluids can be at risk of developing hospital-acquired infection. In most cases, the development of intravenous-related infection is related to the failure of health care professionals to apply a strict sterile technique when performing and managing the intravenous insertion and removal process (O’Grady et al., 2002).

How is the dimension of color treated in the cartoon 'Spongebob Coursework

How is the dimension of color treated in the cartoon 'Spongebob Squarepants' (i.e. Is it realistic, or surreal) - Coursework Example The main character of the story, Sponebod Squarepants is given a mix of bright and dull yellow color. When individually assessing the color scheme of the main character, primarily a realistic approach can be observed. The color yellow goes along with the concept of a typical realistic kitchen sponge. Adding to it, the character has been given a dull pattern on the sides of its body. This connects the character to the factual state of a kitchen sponge, which is rubbed and squeezed turning it dull and pale. Though in this aspect there is a realistic approach in the treatment of color, while considering the cumulative visual impact of this character along with other animate and inanimate characters, the approach can be observed to be surreal. Contrasting combinations of colors are quite frequently used all through the cartoon series. The color schemes used in the cartoon are quite uncommon in real life scenario. However, the cartoon being inspired by the underwater world, this surreal approach helps the viewers connect to their own imaginations of a world they have not

Trends and Challenges in Training and Development Essay

Trends and Challenges in Training and Development - Essay Example Training them to become more transparent and accountable to their duties can be a good step in ensuring that businesses are run properly (Scott, 2014). Another current trend affecting training and development is globalization. Globalization will aim at shaping leadership programs (Scott, 2014). In the event of having a world which is able to inter-connect, various training and development practices are able to be shared from one good company to the rest hence making the existing leadership programs much better (Scott, 2014). Many businesses will adopt a global dimension in order to develop their leadership. The only challenge that will face the business if they adopt this trend will be losing ground in the competitive market place (Thacker, 2012). In training and development, the demand by workers for basic skills training is another trend currently emerging. In the event of companies trying to cut on budget after being hit by the recession in order to maximize on profits, programs aimed at impacting trainees’ basic skills will be introduced (Thacker, 2012). The basic skills program will be designed to ensure the trainees develop skills in critical thinking, communication skills, creativity and collaboration. The challenge with this trend will entail employing individuals capable of dedicating their time to impact the trainees with these basic skills (Thacker, 2012). In addition, another trend currently being adopted by companies will be offering training programs so as to build employee loyalty. In order for companies to retain some of their skilled employees, training them in various aspects can provide them a chance and the spirit of development once in the given organization (Tarique, 2014). An employee is more likely to remain in an organization which enhances his or her skills than one which does not offer. This training programs, will offer a chance to build closer relationships among worker and the

Digital modulation and demodulation

Digital modulation and demodulation Chapter 1 Digital Communications 1.0 Digital Communication 1.1 Introduction Communication Process: When we think of communication, we usually think of people talking or listening to each other. This may happen face to face, or it may occur through the assistance of a telephone, radio, or television. Basically, communication is the transfer of information. Life In our modern, complex world depends more and more on the transfer of information. The increasing dependency on the transfer of information has stimulated the growth of more and more communication systems. This surge in communication and communication systems has been referred to as a technological revolution. This shows understand the transfer of information in a communication system The communication system will consist of at least the three parts shown. The channel can be as simple as the air that carries the sound of your voice, or as complex as the satellite network required to carry a television program around the world. The most common problem encountered by the communication process is interference. Interference is any force that disrupts or distorts the information or message while it is being channeled. It could be noise, as in the case of normal conversation, or atmospheric weather changes, as In the case of radio or television The biggest cause of interference, however, is a simple misinterpretation of the intended message. Cultural, economic, and political diversities allow people to receive the same message but interpret it differently. Communication Systems: Communication system is a combination of processes and hardware used to accomplish the transfer of Information (communication). A system is a group of interrelated parts. We find that there are systems all around us. In nature, we can also find examples of systems that have been created by people. An automobile, a washing machine, and an electric drill are examples. 1.2 TYPES OF COMMUNICATION: Based on the requirements, the communications can be of different types: Point-to-point communication: In this type, communication takes place between two end points. For instance, in the case of voice communication using telephones, there is one calling party and one called party. Hence the communication is point-to-point. Point-to-multipoint communication: In this type of communication, there is one sender and multiple recipients. For example, in voice conferencing, one person will be talking but many others can listen. The message from the sender has to be multicast to many others. Broadcasting: In a broadcasting system, there is a central location from which information is sent to many recipients, as in the case of audio or video broadcasting. In a broadcasting system, the listeners are passive, and there is no reverse communication path. In simplex communication, the communication is one-way only. In half-duplex communication, communication is both ways, but only in one direction at a time. In full-duplex communication, communication is in both directions simultaneously. Simplex communication: In simplex communication, communication is possible only in one direction. There is one sender and one receiver; the sender and receiver cannot change roles. Half-duplex communication: Half-duplex communication is possible in both directions between two entities (computers or persons), but one at a time. A walkie-talkie uses this approach. The person who wants to talk presses a talk button on his handset to start talking, and the other persons handset will be in receiving mode. When the sender finishes, he terminates it with an over message. The other person can press the talk button and start talking. These types of systems require limited channel bandwidth, so they are low cost systems. Full-duplex communication: In a full-duplex communication system, the two parties-the caller and the called-can communicate simultaneously, as in a telephone system. However, note that the communication system allows simultaneous transmission of data, but when two persons talk simultaneously, there is no effective communication! The ability of the communication system to transport data in both directions defines the system as full-duplex. 1.3 ANALOG VERSUS DIGITAL TRANSMISSION: In analog communication, the signal, whose amplitude varies continuously, is transmitted over the medium. Reproducing the analog signal at the receiving end is very difficult due to transmission impairments. Hence, analog communication systems are badly affected by noise. In a digital communication system, 1s and 0s are transmitted as voltage pulses. So, even if the pulse is distorted due to noise, it is not very difficult to detect the pulses at the receiving end. Hence, digital communication is much more immune to noise as compared to analog communication. 1.4 Digital Modulation: Firstly, what do we mean by digital modulation? Typically the objective of a digital communication system is to transport digital data between two or more nodes. In radio communications this is usually achieved by adjusting a physical characteristic of a sinusoidal carrier, the frequency, phase, amplitude or a combination thereof. This is performed in real systems with a modulator at the transmitting end to impose the physical change to the carrier and a demodulator at the receiving end to detect the resultant modulation on reception. * Modulation is the process of varying some characteristic of a periodic wave with an external signal. * Modulation is utilized to send an information bearing signal over long distances. * Radio communication superimposes this information bearing signal onto a carrier signal. * These high frequency carrier signals can be transmitted over the air easily and are capable of traveling long distances. * The characteristics (amplitude, frequency, or phase) of the carrier signal are varied in accordance with the information bearing signal. * In the field of communication engineering, the information bearing signal is also known as the modulating signal. * The modulating signal is a slowly varying signal as opposed to the rapidly varying carrier frequency. The principal of a digital communication system is that during a finite interval of time, it sends a waveform from a finite set of possible waveforms, in contrast to an analog communication system, which sends a waveform from an infinite variety of waveform shapes, with theoretically infinite resolution. In a DCS (digital communication system), the objective of the receiver is not to reproduce a transmitted waveform with precision. The objective is to determine from a noise-perturbed signal which waveform from the finite set of waveforms was sent by the transmitter. Why Digital?  · The primary advantage is the ease with which digital signals, compared with analog signals, is regenerated. The shape of the waveform is affected by two basic mechanisms. As all transmission lines and circuits have some non-ideal frequency transfer function, there is a distorting effect on the ideal pulse. Unwanted electrical noise or other interference further distorts the pulse waveform. Both of these mechanisms cause the pulse shape to degrade. * With digital techniques, extremely low error rates producing high signal fidelity are possible through error detection and correction but similar procedures are not available with analog. * Digital circuits are more reliable and can be reproduced at a lower cost than analog circuits. * Digital hardware lends itself to more flexible implementation than analog circuits. * The combination of digital signals using Time Division Multiplexing (TDM) is simpler than combining analog signals using Frequency Division Multiplexing (FDM). Metrics for Digital Modulation à ¢Ã¢â€š ¬Ã‚ ¢ Power Efficiency Ability of a modulation technique to preserve the fidelity of the digital message at low power levels Designer can increase noise immunity by increasing signal power Power efficiency is a measure of how much signal power should be increased to achieve a particular BER for a given modulation scheme Signal energy per bit / noise power spectral density: Eb / N0 à ¢Ã¢â€š ¬Ã‚ ¢ Bandwidth Efficiency Ability to accommodate data within a limited bandwidth Tradeoff between data rate and pulse width Throughput data rate per hertz: R/B bps per Hz à ¢Ã¢â€š ¬Ã‚ ¢ Shannon Limit: Channel capacity / bandwidth C/B = log2(1 + S/N) Disadvantages of Digital Systems * Digital systems tend to be very signal processing intensive compared with analog. * Digital systems need to allocate a significant share of their resources to the task of synchronization at various levels. With analog signals synchronization is accomplished more easily. * One disadvantage of digital communication system is non-graceful degradation. When the SNR drops below a certain threshold, the quality of service can change form very good to very poor. Most analog systems degrade more gracefully. Formatting The goal of the first essential processing step, formatting is to ensure that the source signal is compatible with digital processing. Transmit formatting is a transformation from source information to digital symbols. When data compression in addition to formatting is employed, the process is termed source coding. The digital messages are considered to be in the logical format of binary 1s and 0s until they are transformed by pulse modulation into base band (pulse) waveforms. Such waveforms are then transmitted over a cable. No channel can be used for the transmission of binary digits without first transforming the digits to waveforms that are compatible with the channel. For base band channels, compatible waveforms are pulses. The conversion from a bit of streams to a sequence of pulse waveforms takes place in the block labeled, modulator. The output of a modulator is typically a sequence of pulses with characteristics that correspond to the digits being sent. After transmission through the channel the pulse waveforms are recovered (demodulated) and detected to produce an estimate of the transmitted digits. Formatting in a digital Communication System Symbols When digitally transmitted, the characters are first encoded into a sequence of bits, called a bit stream or base band signal. Group of K bits can then be combined to form new digits, or symbols, from a finite or alphabet of M = 2^K such symbols. A system using a symbol set size of M is referred to as M-array system. Waveform Representation of Binary Digits Digits are just abstractions way to describe the message information. Thus we need something physical that will represent or carry the digits. Thus binary digits are represented with electrical pulses in order to transmit them through a base band channel. At the receiver, a determination must be made regarding the shape of pulse. The likelihood of correctly detecting the pulse is a function of the received signal energy (or area under the pulse). PCM Waveform Types When pulse modulation is applied to a binary symbol, the resulting binary waveform is called a PCM waveform. There are several types of PCM waveforms. These waveforms are often called line codes. When pulse modulation is applied to non-binary symbol, the resulting waveform is called an M-ary pulse modulation waveform. The PCM waveforms fall into the following four groups. 1) Non return to zero (NRZ) 2) Return to zero (RZ) 3) Phase encoded ) Multilevel binary The NRZ group is probably the most commonly used PCM waveform. In choosing a waveform for a particular application, some of the parameters worth examining are 1) DC component 2) Self clocking 3) Error detection ) Bandwidth compression 5) Differential encoding 6) Noise immunity The most common criteria used for comparing PCM waveforms and for selecting one waveform type from many available are 1) Spectral characteristics 2) Bit synchronization capabilities 3) Error detection capabilities ) Interference 5) Noise immunity 6) Cost and complexity of implementation Bits per PCM Word and Bits per Symbol Each analog sample is transformed into a PCM word up to group of bits. The number of quantization levels allowed for each sample can describe the PCM word size; this is identical to the number of values that the PCM word can assume. We use L=2^l Where L is the number of quantization levels in PCM word, l is the number of bits needed to represent those levels. M-ARY Pulse Modulation Waveforms There are three basic ways to modulate information onto a sequence of pulses; we can vary the pulses amplitude, position, or duration. This leads to the names 1) PAM (pulse amplitude modulation) 2) PPM (pulse position modulation) 3) PDM/PWM (pulse duration modulation/ pulse width modulation) When information samples without any quantization are modulated on to the pulses, the resulting pulse modulation can be called analog pulse modulation. When the information samples are first quantized, yielding symbols from an M-ary alphabet set, and the modulation on to pulses, the resulting pulse modulation is digital and we refer to it as M-ary pulse modulation. Base-band modulation with pulses has analogous counterparts in the area of band-pass modulation. PAM is similar to amplitude modulation, while PPM and PDM are similar to phase and frequency modulation respectively. Spectral Density The spectral density of a signal characterizes the distribution of the signals energy or power in the frequency domain. Energy Spectral Density We can relate the energy of a signal expressed in time domain to the energy expressed in frequency domain as: à ¢Ã‹â€ Ã… ¾ Ex = à ¢Ã‹â€ Ã‚ « x ²(t) dt -à ¢Ã‹â€ Ã… ¾ à ¢Ã‹â€ Ã… ¾ = à ¢Ã‹â€ Ã‚ « |X (f) | ² df -à ¢Ã‹â€ Ã… ¾ Where X (f) is the Fourier transform of the non periodic signal x (t). Let à Ã‹â€  (t) = |X (f) | ² à ¢Ã‹â€ Ã… ¾ Ex = 2 à ¢Ã‹â€ Ã‚ « à Ã‹â€ x (f) df -à ¢Ã‹â€ Ã… ¾ Power Spectral Density The power spectral density function Gx (t) of the periodic signal x (t) is real, even and nonnegative function of frequency that gives the distribution of the power of x (t) in the frequency domain. à ¢Ã‹â€ Ã… ¾ Gx (t) = à ¢Ã‹â€ Ã¢â‚¬Ëœ |Cn| ² à ¢Ã‹â€ Ã‚ «(f-nfo) n =-à ¢Ã‹â€ Ã… ¾ PSD of a periodic signal is a discrete function of frequency. à ¢Ã‹â€ Ã… ¾ Px = à ¢Ã‹â€ Ã‚ « Gx (t) df -à ¢Ã‹â€ Ã… ¾ à ¢Ã‹â€ Ã… ¾ = 2 à ¢Ã‹â€ Ã‚ «Gx (F) df 0 If x (t) is a non-periodic signal it cannot be expressed by a Fourier series, and if it is a non-periodic power signal (having infinite energy) it may not have a Fourier transform. However we still express the PSD of such signals in a limiting sense. Chapter 2 Modulation and Demodulation 2.0 Modulation and Demodulation Since the early days of electronics, as advances in technology were taking place, the boundaries of both local and global communication began eroding, resulting in a world that is smaller and hence more easily accessible for the sharing of knowledge and information. The pioneering work by Bell and Marconi formed the cornerstone of the information age that exists today and paved the way for the future of telecommunications. Traditionally, local communication was done over wires, as this presented a cost-effective way of ensuring a reliable transfer of information. For long-distance communications, transmission of information over radio waves was needed. Although this was convenient from a hardware standpoint, radio-waves transmission raised doubts over the corruption of the information and was often dependent on high-power transmitters to overcome weather conditions, large buildings, and interference from other sources of electromagnetic. The various modulation techniques offered different solutions in terms of cost-effectiveness and quality of received signals but until recently were still largely analog. Frequency modulation and phase modulation presented certain immunity to noise, whereas amplitude modulation was simpler to demodulate. However, more recently with the advent of low-cost microcontrollers and the introduction of domestic mobile telephones and satellite communications, digital modulation has gained in popularity. With digital modulation techniques come all the advantages that traditional microprocessor circuits have over their analog counterparts. Any shortfalls in the communications link can be eradicated using software. Information can now be encrypted, error correction can ensure more confidence in received data, and the use of DSP can reduce the limited bandwidth allocated to each service. As with traditional analog systems, digital modulation can use amplitude, frequency, or phase modulation with different advantages. As frequency and phase modulation techniques offer more immunity to noise, they are the preferred scheme for the majority of services in use today and will be discussed in detail below 2.1 Digital Frequency Modulation: A simple variation from traditional analog frequency modulation can be implemented by applying a digital signal to the modulation input. Thus, the output takes the form of a sine wave at two distinct frequencies. To demodulate this waveform, it is a simple matter of passing the signal through two filters and translating the resultant back into logic levels. Traditionally, this form of modulation has been called frequency-shift keying (FSK). 2.2 Digital Phase Modulation: Spectrally, digital phase modulation, or phase-shift keying, is very similar to frequency modulation. It involves changing the phase of the transmitted waveform instead of the frequency, these finite phase changes representing digital data. In its simplest form, a phase-modulated waveform can be generated by using the digital data to switch between two signals of equal frequency but opposing phase. If the resultant waveform is multiplied by a sine wave of equal frequency, two components are generated: one cosine waveform of double the received frequency and one frequency-independent term whose amplitude is proportional to the cosine of the phase shift. Thus, filtering out the higher-frequency term yields the original modulating data prior to transmission. * Modulate and demodulate/detect blocks together are called a modem. * The frequency down conversion is performed in the front end of the demodulator. * Only formatting, modulation, demodulation/detection and synchronization are essential for a digital communication system. * FORMATTING transforms the source information into bits. * From this point up to pulse modulation block, the information remains in the form of a bit stream. * Modulation is the process by which message symbols or channel symbols are converted to waveforms that are compatible with the requirements imposed by transmission channel. Pulse modulation is an essential step because each symbol to be transmitted must first be transformed from a binary representation to a base band waveform. * When pulse modulation is applied to binary symbols, the resulting binary waveform is called a PCM waveform. When pulse modulation is applied to non-binary symbols, the resulting waveform is called an M-ary pulse modulation waveform. * Band pass modulation is required whenever the transmission medium will not support the propagation of pulse like waveforms. * The term band pass is used to indicate that the base band waveform gi (t) is frequency translated by a carrier wave to a frequency that is much larger than the spectral content of gi (t). * Equalization can be described as a filtering option that is used in or after the demodulator to reserve any degrading effects on the signal that were caused by the channel. An equalizer is implemented to compensate for any signal distortion caused by a no ideal hi(t) * Demodulation is defined as a recovery of a waveform (band pass pulse) and detection is defined as decision-making regarding the digital meaning of that waveform. 2.3 Linear Modulation Techniques * Digital modulation techniques may be broadly classified as linear and non-linear. In linear modulation techniques, the amplitude to the modulation signal S (t) varies linearly with the modulating digital signal m (t). * Linear modulation techniques are bandwidth efficient. * In a linear modulation technique, the transmitted signal S (t) can be expressed as: S (t) = Re [Am (t) exp (j2pfct)] = A [mr(t)cos(2pfct) mI(t)sin(2pfct)] Where A is the amplitude fc is the carrier frequency m (t) = mr(t) + mI(t) is a complex envelope representation of the modulated signal which is in general complex form. * From the equations above, it is clear that the amplitude of the carrier varies linearly with the modulating signal. * Linear modulation schemes, in general do not have a constant envelope. Linear modulation schemes have very good spectral efficiency. Normalized Radian Frequency Sinusoidal waveforms are of the form: X (t) =Acos (wt+f) - (1) If we sample this waveform, we obtain X[n] =x (nTs) =Acos (wnTs+f) =Acos (wn+f) (2) Where we have defined w to be Normalized Radian Frequency: w=wTs The Signal in (2) is a discrete time cosine signal, and w is the discrete time radian frequency. w has been normalized by the sampling period. w has the units of radians/second, w=wTs has the units of radians; i.e. wis a dimensionless quantity. This is entirely consistent with the fact that the index n in x[n] is a dimensionless. Once the samples are taken from x (t), the time scale information is lost. The discrete time signal is just a sequence of numbers, and these numbers carry no information about the sampling period, which is the information required to reconstruct the time scale. Thus an infinite number of continuous time sinusoidal signals can be transformed into the same discrete time sinusoid by sampling. All we need to is to change the sampling period with changes in frequency of the continuous time sinusoid. 2.4 Baseband Transmission Baseband Demodulation/Detection  · The filtering at the transmitter and the channel typically cause the received pulse sequence to suffer from ISI (Inter Symbol Interference), thus the signal is not quiet ready for sampling and detection.  · The goal of the demodulator is to recover the pulse with best possible signal to noise ratio (SNR), free of any ISI.  · Equalization is a technique used to help accomplish this goal. Every type of communication channel does not require the equalization process. However equalization process embodies a sophisticated set of signal processing techniques, making it possible to compensate for channel induced interference.  · A received band pass waveform is first transformed to a base band waveform before the final detection step takes place.  · For liner systems, the mathematics of detection is unaffected by a shift in frequency. * According to the equivalence theorem, all linear signal-processing simulations can take place at base band (which is preferred for simplicity) with the same result as at band pass. Thus the performance of most digital communication systems will often be described and analyzed as if the transmission channel is a base band channel. Chapter 3 p/4 Quadrature 3.0 p/4 Quadrature Phase Shift Keying (p/4 QPSK) 3.1 Linear Modulation Techniques * Digital modulation techniques may be broadly classified as linear and non-linear. In linear modulation techniques, the amplitude to the modulation signal S (t) varies linearly with the modulating digital signal m (t). * Linear modulation techniques are bandwidth efficient. * In a linear modulation technique, the transmitted signal S (t) can be expressed as: S (t) = Re [Am (t) exp (j2pfct)] = A [mr(t)cos(2pfct) mI(t)sin(2pfct)] Where A is the amplitude fc is the carrier frequency m (t) = mr(t) + mI(t) is a complex envelope representation of the modulated signal which is in general complex form. * From the equations above, it is clear that the amplitude of the carrier varies linearly with the modulating signal. * Linear modulation schemes, in general do not have a constant envelope. Linear modulation schemes have very good spectral efficiency. There are three major classes of digital modulation techniques used for transmission of digitally represented data: * Amplitude-shift keying (ASK) * Frequency-shift keying (FSK) * Phase-shift keying (PSK) All convey data by changing some aspect of a base signal, the carrier wave, (usually a sinusoid) in response to a data signal. In the case of PSK, the phase is changed to represent the data signal. There are two fundamental ways of utilizing the phase of a signal in this way: * By viewing the phase itself as conveying the information, in which case the demodulator must have a reference signal to compare the received signals phase against; or * By viewing the change in the phase as conveying information differential schemes, some of which do not need a reference carrier (to a certain extent). A convenient way to represent PSK schemes is on a constellation diagram. This shows the points in the Argand plane where, in this context, the real and imaginary axes are termed the in-phase and quadrature axes respectively due to their 90 ° separation. Such a representation on perpendicular axes lends itself to straightforward implementation. The amplitude of each point along the in-phase axis is used to modulate a cosine (or sine) wave and the amplitude along the quadrature axis to modulate a sine (or cosine) wave. In PSK, the constellation points chosen are usually positioned with uniform angular spacing around a circle. This gives maximum phase-separation between adjacent points and thus the best immunity to corruption. They are positioned on a circle so that they can all be transmitted with the same energy. In this way, the moduli of the complex numbers they represent will be the same and thus so will the amplitudes needed for the cosine and sine waves. Two common examples are binary phase-shift keying (BPSK) which uses two phases, and quadrature phase-shift keying (QPSK) which uses four phases, although any number of phases may be used. Since the data to be conveyed are usually binary, the PSK scheme is usually designed with the number of constellation points being a power of 2. 3.2 Amplitude Shift Keying (ASK) Amplitude shift keying ASK in the context of digital communications is a modulation process, which imparts to a sinusoid two or more discrete amplitude levels. These are related to the number of levels adopted by the digital message. For a binary message sequence there are two levels, one of which is typically zero. Thus the modulated waveform consists of bursts of a sinusoid. In Amplitude Shift Keying the Amplitude varies whereas the phase and frequency remains the same as shown in following . One of the disadvantages of ASK, compared with FSK and PSK, for example, is that it has not got a constant envelope. This makes its processing (eg, power amplification) more difficult, since linearity becomes an important factor. However, it does make for ease of demodulation with an envelope detector. Thus demodulation is a two-stage process: à ¥ Recovery of the band limited bit stream à ¥ Regeneration of the binary bit stream 3.3 Frequency-shift keying (FSK) Frequency-shift keying (FSK) is a method of transmitting digital signals. The two binary states, logic 0 (low) and 1 (high), are each represented by an analog waveform. Logic 0 is represented by a wave at a specific frequency, and logic 1 is represented by a wave at a different frequency. In frequency Shift Keying the frequency varies whereas the phase and amplitude remains the same. Phase shift keying (PSK) Phase Shift Keying (PSK) was developed during the early days of the deep-space program. PSK is now widely used in both military and commercial communication systems. In phase shift Keying the phase of the transmitted signal varies whereas the amplitude and frequency remains the same. The general expression for the PSK is as Where, ji(t) = the phase term will have M discrete values, given by, ji(t) = 2pi /M 3.4 Binary PSK In binary phase shift keying we have two bits represented by the following waveforms; S0(t) = A cos (wt) represents binary 0 S1(t) = A cos (wt + p) represents binary 1 For M-array PSK, M different phases are required, and every n (where M=2n) bits of the binary bit stream are coded as one signal that is transmitted as A sin (wt + qj) where j=1,.., M 3.5 Quadra phase-Shift Modulation Taking the above concept of PSK a stage further, it can be assumed that the number of phase shifts is not limited to only two states. The transmitted carrier can undergo any number of phase changes and, by multiplying the received signal by a sine wave of equal frequency, will demodulate the phase shifts into frequency-independent voltage levels. This is indeed the case in quadraphase-shift keying (QPSK). With QPSK, the carrier undergoes four changes in phase (four symbols) and can thus represent 2 binary bits of data per symbol. Although this may seem insignificant initially, a modulation scheme has now been supposed that enables a carrier to transmit 2 bits of information instead of 1, thus effectively doubling the bandwidth of the carrier Eulers relations state the following: Now consider multiplying two sine waves together, thus From Equation 1, it can be seen that multiplying two sine waves together (one sine being the incoming signal, the other being the local oscillator at the receiver mixer) results in an output frequency double that of the input (at half the amplitude) superimposed on a dc offset of half the input amplitude. Similarly, multiplying by gives which gives an output frequency double that of the input, with no dc offset. It is now fair to make the assumption that multiplying by any phase-shifted sine wave yields a demodulated waveform with an output frequency double that of the input frequency, wh

Education: Past, Present, And Future :: essays research papers

Education: Past, Present, and Future Education, without it we would all be mindless wonders wandering around the globe. Education is an important factor in our lives, but the past, present, and future of education is changing. And change it will until our education system is the best in the world. In the past, Education in America was plain and simple. We've all heard the stories of how our ancestors used to have to walk to school 5 miles in the snow in the heat of summer. These shameless exagerations were meant for us to think that school back in the "good ole days" was very dificult and surpassed the level of difficulty students today have. In reality, school, although most early schools were combonation classes with a variety of age groups as students. Almost each individual was given an equal amount of personal help from the teacher. Also, life wasn't as complecated as they are now. One teacher would teach the whole class a limeted variety of subjects such as arithmatic and english. Education was just eaiser when it first became popular. Nowadays, in the present, school not only is a place to learn, it's a place to stress out. As I walk through the halls all students seem to have that academic nervousness. If you listen to the conversations that go on in the hall it's always, "Ohh my gosh, Becky! I'm going to have a fat cow! I think I'm getting a B in my chemistry class, and that is going to ruin my record." Pressure is constantly put upon students to get "straight A's" It is very rare when a student will not shoot for an A on a quiz. It's human nature to succeed, but with the pressure put on us by the teachers, parents, peers, and colleges, it's a heavy load to handle. Now, scientists recently did an expiriment. They placed a child in a room with some brand new toys. They left him there for a couple of hours and he did not play with them. The scientists puzzeled took the boy aside and asked him why he did not play with the toys. The boy replied that he did not want to break them. So, scientists then took another child and placed him in a room filled with horse manure. The boy was having fun swimming around in it, having a blast with the horse manure. When the scientists asked the boy why he played with the horse manure, the boy replied, "Well, with all of this horse manure, there has

Important Output Computer Devices in Accounting

Considering the input devices required in setting up the office, The major computer gadgets that will be focused on are the Keyboard and Mouse. These input devices are going to play a major in the insertion of data into the office system. The keyboard is the computer input device that enables the user enter data into the computer . The keys in a keyboard are classified into †¢Alphanumeric keys-consist of letters and number ,which helps in keying in and calculating data that are inserted into the system. Punctuation keys-consists of the period,comma,semicolon,etc †¢Special keys-this keys consist of the function keys, control keys, arrow keys, caps lock key etc. Looking at the account office, the accountants needs the type of keyboard that enables them work effectively with ease. As an accountant, normally when entering a data, you type all the data with your right hand and have always have to stop and use your left to hit the tab key which is completely inefficient and discomforting. In order words in providing a solution for the discomfort, the R-tab Keyboard will be used in the office setup. the R-tab keyboard has the tab key on the right of the number pad, which makes it easier and more efficient for an accountant to use. So instead of having to interrupt the left hand to hit the tab key, the right hand stride wont be breached while typing . This r-tab keyboard will improve the efficiency of the office by 25% higher than the usage of an ordinary keyboard. The longer the accountants use it. The longer their productivity will increase. Accountants that have used the r-tab keyboard found out that they were able to finish data and numeric entries much faster in a much quicker manner. The mouse is the computer input device to which controls the location of a cursor on a video display that is connected to a computer. Generally in categorizing the computer mouse it is of two types which is the mechanical and optical mouse. Being an input device that pinpoints and sends command into the system it is a major input device that will and always a major vital role in any computer system setup. In my analysis of the computer mouse, the best mouse that will be in tune to the satisfaction of the accountants is the Logitech Performance Mouse MX. The Logitech Performance Mouse has a general use functionality which is sculpted for the right hand only. It has a number of interesting features, which includes the darkfield tracking, which enables the mouse to work on any surface. It has a unifying technology which connects six devices to computer(this particular feature helps the members of the office access and gain control of a system from wherever they are within the office range). With the sophisticated features and performance of the mouse MX the user can easily spin into a document and scroll incrementally when navigating images and slides. These are the two major input devices that yield great productivity in an office, without these the employees productivity will become a major waste and any computer gadget that’s supposed to ignite greater yield should be considered carefully before choosen. So in order words the R-tab keyboard and the mouse MX are the best and suitable input devices required for the office setup.

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