Sociological Theories

This theory has caught the attention of the nation, and the federal government has taken steps to roved assistance in lower income and poverty stricken areas. One of the main programs that have been implemented into these lower income areas are Yam's. The goal behind the YMCA is to bring sports, and other activities into the lower income areas and keep juveniles busy within the YMCA and keeping these kids off the streets and out of trouble. The second theory is the Social Process Theory.The Social Process Theory is based upon the belief that colonization is key in determining ones behavior. If colonization is absent or portrayed in a negative manner, it can cause venires to act out in feel alienated from normal social behaviors. Children who feel isolated from their peers and do not have a loving environment at home are more likely to be involved in delinquent behavior. These children often turn to drugs or alcohol as an answer. An example of both state and federal funded program tha t assists with the Social Process Theory is the D. A. R. E Program.The D. A. R. E program is designed to prevent kids from using drugs, engaging in violent and criminal acts and encourages them to engage n normal social behaviors with other kids their age. The third theory is the Social Conflict Theory. The Social Conflict Theory is a belief that our entire society is in a constant state of internal conflict, with various groups trying to impose their belief on others. The Social Conflict Theory suggests that those of wealth and power help define laws to meet their specific needs while ignoring the needs of the rest of society.It is believed that adolescents that do not fit into the needs of the powerful members of society are labeled criminal delinquents. Those that suffer the most from social conflict are people of color or those living in poverty stricken areas. An example of a program that targets the youth suffering from the social conflict program is Promising Practices Networ k. The Promising Practices Network is a school based violence prevention program that serves over 400 public schools in poverty stricken areas. This program is designed to fight prejudice, stereotypes and other types of violence.As shown here these three sociological theories are vital ways to view the issues related to juvenile delinquency. The programs related to each of these theories are extremely beneficial to lowering crime rates among juveniles. I truly hope that we continue to fund these wonderful programs, as it benefits the future of America. Sociological Theories Chapter one there are three different types of sociological theories. The three types are functionalist theory, conflict theory, and symbolic theory. We will cover and talk about the differences. First is the functionalist theory. The functionalist theory is when the people who live in the area are all part of a bigger plan. Everyone there is an equal no one has more than anyone else. When I think about functionalist I think of farm. As in like the whole community works on the farm like someone feed and mike cows and someone male food the cows eat so and and so forth. August Comte and Herbert Spencer viewed society as a kind of living organism. When all the people are working together is called normal and when there not it’s abnormal The conflict theory provides a third perspective on social life. Unlike the functionalists, who view society as harmonious whole, with its parts working together, conflict theorists talk about society being composed of groups that are competing with one another for scarce resources. Karl Marx is the founder of this theory. This is like slavery to me because slaves worked for a higher power for very little are no pay at all. Soon people get mad and rise up to the greater power and demand a change. The last one is symbolic theory witch is when people develop and share their views of the world, and focus on micro level. This is like used when people back in the day didn’t read and right. The easy way to talk to people is with pictures. They are easy to understand than writing. There are many differences between these things. For one they were all made up in different area of times, and locations in the world. All the theories are made but by different people, and they had their way of thinking of it. They all apply for different part of life, but very close. One thing they do haven common is that they all related to groups of people. Is takes a group of people to make it work. All these theories have happened in some part of the world. Not only have they happen they still happen in today society. Finally in collection there is nothing new under the sun, and the same things they are talking about there are happing now. And all these theories can be facts. Sociological Theories This theory has caught the attention of the nation, and the federal government has taken steps to roved assistance in lower income and poverty stricken areas. One of the main programs that have been implemented into these lower income areas are Yam's. The goal behind the YMCA is to bring sports, and other activities into the lower income areas and keep juveniles busy within the YMCA and keeping these kids off the streets and out of trouble. The second theory is the Social Process Theory.The Social Process Theory is based upon the belief that colonization is key in determining ones behavior. If colonization is absent or portrayed in a negative manner, it can cause venires to act out in feel alienated from normal social behaviors. Children who feel isolated from their peers and do not have a loving environment at home are more likely to be involved in delinquent behavior. These children often turn to drugs or alcohol as an answer. An example of both state and federal funded program tha t assists with the Social Process Theory is the D. A. R. E Program.The D. A. R. E program is designed to prevent kids from using drugs, engaging in violent and criminal acts and encourages them to engage n normal social behaviors with other kids their age. The third theory is the Social Conflict Theory. The Social Conflict Theory is a belief that our entire society is in a constant state of internal conflict, with various groups trying to impose their belief on others. The Social Conflict Theory suggests that those of wealth and power help define laws to meet their specific needs while ignoring the needs of the rest of society.It is believed that adolescents that do not fit into the needs of the powerful members of society are labeled criminal delinquents. Those that suffer the most from social conflict are people of color or those living in poverty stricken areas. An example of a program that targets the youth suffering from the social conflict program is Promising Practices Networ k. The Promising Practices Network is a school based violence prevention program that serves over 400 public schools in poverty stricken areas. This program is designed to fight prejudice, stereotypes and other types of violence.As shown here these three sociological theories are vital ways to view the issues related to juvenile delinquency. The programs related to each of these theories are extremely beneficial to lowering crime rates among juveniles. I truly hope that we continue to fund these wonderful programs, as it benefits the future of America.

History of Biligual Education Essay

My project was to go and find out about bilingual education’s history, process, and the experts in the field of bilingual education. Bilingualism is the ability to speak two languages fluently. Bilingualists study Bilingualism and bilingual education, which is teaching all subjects in school through two different languages. Bilingual Education was first adopted in Ohio in 1839, due to the increase of German-Americans (Rethinking). By the end of the 19th century, many states had adopted bilingual education laws to meet the demands of new immigrants due to industrialization. When World War I came many Americans changed their views of bilingual education, due to the fear of German-Americans and the government’s new Americanization policies, including English-only instruction. It wasn’t until the Civil Rights Movement Era and the Bilingual Education Act of 1968, when bilingual education was reintroduced into the United States. â€Å"The court’s decision in th e landmark Lau v. Nichols case required schools to take â€Å"affirmative steps† to overcome language barriers impeding children’s access to the curriculum. Congress immediately endorsed this principle in the Equal Educational Opportunity Act of 1974.†(Rethinking). In California, bilingual education was banned until 1967. In 1967, Governor Ronald Reagan signed legislation (SB 53) that authorized bilingual education, before the Bilingual Education Act of 1968. A blow for bilingual education came in 2002, when President George Bush’s No Child Left Behind Act got rid of the Bilingual Education Act of 1968, changing the way people look at bilingual education. In 1998 California, under Ron Unz’s Proposition 227, reverted Ronald Reagan’s SB 53. This Proposition later confirms Bush’s No Child Left Behind Act and the country’s renewed interest in English only instruction, due to the Iraq War. Many critics of bilingual education believe that bilingual education is failed, but proponents of bilingual education feel bilingual education is a better option than English-only instruction. Critics of bilingual education believe that children who receive bilingual education will not be able to help students learn English as well as English-only students. One of the critics of bilingual education, Rosalie Pedalino Porter of the Institute for Research in English Acquisition and Development (READ), believes that â€Å"the expectations for bilingual schooling were threefold: better and more rapid learning of English; better mastery of school subjects; and higher self-esteem among students, which could lead to higher academic achievement and fewer school dropouts. Unfortunately, none of these goals was achieved†¦The goal [of English immersion] is threefold: early literacy development in English, subject matter instruction in English with a special curriculum, and early inclusion of LEP students in mainstream classrooms for maximum exposure to native speakers of English and for greater integration of diverse student populations†(Porter). However, â€Å"controlled studies consistently show that children in such properly organized bilingual classes acquire at least as much English as those in all-English classes and usually acquire more†(Krasen). Another proponent of bilingual education, Jay Greene provided research that â€Å"the use of the native language in instructing limited English proficient children has â€Å"moder ate beneficial effects† and that â€Å"efforts to eliminate the use of the native language in instruction †¦ harm children by denying them access to beneficial approaches†(Greene). In addition to the belief that children who receive bilingual education will not be able to help students learn English as well as English-only students, critics of bilingual education believe that the passage of Proposition 227, caused test scores to increase. Proponents of 227 from the READ Institute argue that, the test scores from 1998-2000, show that minority English language learning students in California have done better on the SAT 9 test than those in bilingual education had done before (Mora). Kenji Hakuta, shows in his article, Points on SAT-9 Performance and Proposition 227, â€Å"test scores rose in districts in California that kept bilingual education, as well as in districts that never had bilingual education† (Hakuta). In addition, â€Å" Scores increase about 1.5 to 2 points per year after a new test is introduced. Thus, test score inflation accounts for about half of the increase in grades two and three in the SAT9 reading test since 1998, and all of the inc rease in grades four through seven SAT9 reading scores in California have actually declined slightly in grades eight through eleven†(Linn et. al). Research done by these bilingualists show that Proposition 227 has not increased the minority English language-learning students in California’s English skills. Critics of bilingual education believe that poorly trained teachers and complicated bilingual education structures cause more confusion than English-only programs. Susan Headden, writing in U.S. News & World Report, comments, â€Å"Poorly trained teachers further complicate the picture. . . . The paucity of qualified candidates has forced desperate superintendents to waive some credentialing requirements and recruit instructors from abroad. The result is teachers who themselves struggle with English† Advocates cite that just because bilingual education needs improvement doesn’t mean it should be eliminated. Critics of bilingual education look at the success of Canada’s French immersion policy in schools. In kindergarten and first grade native-English speakers are taught entirely in French. Then gradually, English is introduced and by the end of elementary school, most students become fluent in French and English. However, more impressive is the bilingual education of European countries. Since there are eleven different official languages of the European Union, students are taught multiple languages .The study of first foreign language begins in first year of primary school, then an additional language is added in the second year of secondary school and the fourth year of secondary school. By the time students exit college with a Baccalaureate degree, they will know at least four languages. From, my research I was able to find proponents and critics of bilingual education. I noticed that there were many more proponents of bilingual education, among them are Kenji Hakuta of Stanfor d University, Colin Baker of the University of Wales, Stephen Krashen of the University of Southern California, Wayne P. Thomas and Virginia Collier at George Mason University, and Jim Cummins of the University of Toronto. Critics of bilingual education include politicians, George Bush, Susan Headden, and Rosalie Pedalino Porter. Perhaps we should be looking to other nations to solve our educational issues, as neither English-only nor bilingual education seems to work. References *Based on an Analysis by National Association of Bilingual Education. (2002, Winter). History of Bilingual Education. Rethinking Schools. Retrieved May 10, 2007, from http://www.rethinkingschools.org/special_reports/bilingual/langhst.shtml * Greene, J. (1997). A meta-analysis of the Rossell and Baker review of bilingual education research. Bilingual Research Journal , 21(3), 103-122. *Hakuta, K. (2000). Points on SAT-9 Performance and Proposition 227. Lecture presented at Stanford University , Cubberley Hall 228, 485 Lasuen Mall Stanford, California. *Headden, S. (1995, September 25). One Nation, One Language? U.S. News & World Report, 38+. Retrieved May 10, 2007, from http://faculty.ed.umuc.edu/~jmatthew/articles/onenation.html *Krasen, S. (1996). Under Attack: The Case Against Bilingual Education. Culver City, CA: Language Education Associates. *Linn, R., Graue, E., & Sanders, N. (1990). Comparing state and district test results to national norms: The validity of claims that ‘everyone is above average. Educational Measurement: Issues and Practice , (9), 5-13. *Mora, J. K. (n.d.). What Do the SAT-9 Scores for Language Minority Students Real ly Mean? Retrieved May 10, 2007, from San Diego State University Web site: http://coe.sdsu.edu/people/jmora/SAT9analysis.htm *Porter, R. P. (1999, December). The Benefits of English Immersion. Educational Leadership, 1(57), 52-56.

Bridgeton Industries Essay Example for Free

Bridgeton Industries Essay 1. Describe the competitive environment for Bridgeton as well as the cost accounting system currently in use. When foreign competition and scarce, expensive gasoline began to play an important role in the market, Bridgeton began to lose domestic market share. The ACF Bridgeton plant faced new challenges in their production that led them to serious cutbacks like the closing of the ACF plant for manufacture of fuel-efficient diesel engines. By 1987, they classified their products in terms of â€Å"world class† competitive position and potential. With four criteria (quality, customer service, technical capability and competitive cost position) they classified their products in Class I (remain), II (observe) and III (outsource). The classification allowed Bridgeton to take decisions on how to better manage their products performance compared to their competitors. The cost accounting system was product costing, a mixed between job costing and process costing. 2. Explain why manifolds moved from Class II to Class III after oil pans and muffler-exhaust systems had been outsourced from the ACF. Despite improvements in the production process manifolds were downgraded from Class II to III. The results were not sufficient, even though they increased the uptime from an average of 30% to 65% they were behind their Japanese competitors that reached a â€Å"world class† goal of 80% uptime. In addition, as seen in Exhibit 2, the direct material costs for manifolds (based on stainless steel) is extremely high as a percentage of sales (around 40%) compared to the other products manufactured at ACF and at a better Class level. However, there was a doubt on this move due to the possibility of new market requirements for lighter weight (more efficient manifolds). This represented a good opportunity for ACF because as they manufactured manifolds with stainless steel, demand could increase and therefore selling price too. Bridgeton Industries. (2017, Feb 11).

None Essay Example | Topics and Well Written Essays - 1500 words - 5

None - Essay Example In china, looking back historically, women underwent much degradation and prolonged oppression from the society as they were viewed as being lesser than their male counterpart. They never had equal rights as men, both in the social, political and economic spheres of the society. In this regard, the women become economically dependent and were never accorded any property or inheritance rights with no possession of an independent income source. Socially, the women were forced to subordinate to their fathers, husbands and sons, obey their fathers before marriage, and after marriage, their husbands and their sons in case they became widows. They had no rights in marriage and were forced to do odd and less important jobs. These marriages in the ancient times were arranged and were not in any manner dependent on the couple’s decisions. Once the females had moved into the marriage, they would then be denied any marital freedom with their task restricted to carrying out the household chores such as cleaning, preparing meals and looking after their children (Wang and Theodore, 19). Theirs was the manual labor in their homes. They never had too the right to education and to participate actively to social activities. The ancient Chinese never considered it serious to educate the females, and this had made their illiteracy levels very high. They underwent the retrogressive culture of polygamy and prostitution that tortured them mentally. For a growing young girl, one’s foot had to be bound on something too that affected their social lives, in order for them not to run or practice other customs. Males, on the other hand, were treated differently and with respect in the society. The male children were treated accordingly by their families as they were regarded as a gift from their gods. In the whole society setup, bearing of sons was much-preferred than the

The objectives of improving Coca-Cola Company's Internal Business Assignment

The objectives of improving Coca-Cola Company's Internal Business Processes - Assignment Example The individual skills and the unique talents of the workers assist the institution in achieving the 2020 vision and the goals therein. The institution thus refers to them as associates due to them being the ambassadors of the company’s brands to the world. There is a close relation of motivating employees to the other targets that are part of the vision of the company by 2020 as a description in (Britain, 2015). The company motivation tactics abide with the objective of the company to make its premises a high place of work whereby people experience the inspiration to be the best. The employee motivation also relates to the achievement of the company’s portfolio in the performance of a list of beverages that are quality brands in the satisfaction of desires and consumer needs. The elevation of the employees also brings the attainment of the goal to be productive by being highly economical. The other relationship is as per the winning culture of the company whereby the company collaborates with genius minds and is in the leadership. A focus of the business to its employees ensures that its outlook for the market is possible to the satisfaction of the needs of the franchise partner. The employee motivation also results in them work ing smart that is a goal of the institution through the acting with urgency and retain an excellent response to change. The great relation to the company also lies in the core statement of the business that appreciates the company to be a brand that inspires passion, fun as well as optimism.

Truth Essay Example | Topics and Well Written Essays - 1250 words

Truth - Essay Example However, diverse the topic of truth, a measure of its boundaries and applications is imperative but logically unattainable. Knowledge in philosophy denotes justified true belief. In trying to explain epistemology, philosophers developed different ideologies. The use of perception in relation to sense data to determine knowledge and, therefore, truth has yielded a lot of debate. For instance, direct realism holds that, the world consists of mind independent physical objects. Through perception, an individual is directly aware of the independent objects. Then comes the science that states, what we perceive as an object is but a reflection of light. Scientists justify their claim beyond a reasonable doubt, in which case the absence of light is equal to the inability to see the object. Perception is, however, not dependent on one sense for humans have an abundance of five. For instance, in the dark one can still hear when he bumps into the object, feel its texture and approximate its siz e (touch), taste the surface and take in its scent (smell). Indirect realism tries to distinguish objects that are physically real and objects perceived by the mind. Indirect realists achieve this by assuming that humans are indirectly aware of mind independent objects. Study of the human mind has revealed that there are states in which the mind cannot distinguish true perceptions from false perceptions. Such states include illusions, dreams and other phenomena such as hallucinations which are real to minds as if they were in normal states. These states, therefore, disclaim the validity of both direct and indirect realism. This, in summary, dictates that the minds interpretation of the light ergo the object and in extension truth is as far as the individual mind perceives. Idealism holds that all physical objects are nothing more than just a collection of sensory ideas. In light of this, idealist can contradictorily say that 1) we are perceptually aware of actual physical things, bu t 2) all experiences are experiences of mental representations. Justification and belief are not enough to make a premise true as mentioned earlier. This insufficiency results in the Gettier problem. Philosophers try to solve this problem for instance, some theorists suggest redefining reliability. Nonetheless, the state of the mind controls the senses in which case truth still relies on an individual’s perception, however, fallible. What then are universal truths? Are all human minds playing a universal trick? Truth is the relation between a thing, state of affairs and their supporting evidence. The statement made is as a result of thought and judgment which require logical constructs to determine, in which case appeal to logos is eminent. Many intellectuals see Correspondence theory as dependent on conforms of external reality, ergo, metaphysics. To justify a preposition P as there has to exist a balanced equation between the components of preposition A and intellect. The b alance of this equation does not restrict to objects and facts hence can apply to feelings, emotion, and people just but a few. Correspondence theory can describe two approaches of truth namely object based and fact based. Object-based correspondence summarizes judgment (in relation to an object) as true only if associate predicates correspond to the object. Noted, two accounts in regard to predicate associations are pertinent a) forming a reference relation and b) forming a correspondence relation. In summary, believes hold true if corresponding facts remain valid and false when corresponding facts are void. The correspondence theory to a considerable extent is a defense for metaphysical realism. However, all knowledge has a foundation in which

Mooting Case Study Example | Topics and Well Written Essays - 2000 words

Mooting - Case Study Example An expensive Olympus video camera disappeared during the guess stay at the hotel and the Hotel employees never notified the customer of the existence a safe service the firm had available to its clients for an extra monetary charge. When this occurred Peter felt the hotel was responsible for the loss of his property. The latter incident involved Peter purchasing a seafood meal in the Hotel's restaurant that caused to him to become sick due to food poisoning. The two combined incident made Peter an unsatisfied client that felt abused. Peter needs legal advice on what are his legal options in order to battle against the business that ruined his priceless vacation time. The Hotel Act 1956 established the parameters that protect the business owner from paying damages to the guess for loss of personal property. The general content of the act is geared towards protecting the business establishment, but it specifies the situations in which the hotel is liable irrelevant of the protection the Act itself provides for companies. The Act states that a hotel or the proprietor of a hotel shall not be liable as an innkeeper to make good to any traveler any loss or damage to personal property the client brought to the premises before or after the person check into the hospitality facilities (Statutelaw, 1991). The circumstances in which the hotel liable for the damage or loss of property of the guess are illustrated in the list below: When the property was stolen, loss or damage through the neglect, fault of the proprietors or any of his employees If the property in question was given to a hotel representative for safe custody such as safe deposit box and the item ended up loss or being damage in any way If at the time of arrival the guess house refused to accept a specific item to be placed in safe custody and the item ended up being stolen or damage during the guess stay in the premises (Statutelaw, 1991). A second law provides the guidelines and legal basis in the case of property loss or damage in a case such as the Peter v McGregor is the Occupiers Act of 1957. The focus of this Act was to provide protection to the customer instead of the business owner in transactions involving the rent of a room in a guess house or hotel. The Occupiers Act of 1957 establishes the parameters to determine liability of occupiers and others for injury or damage resulting to a person or goods lawfully on any land or other property from damages dangers due to the state of the property or to things done to it (Statutelaw, 1991). This Act mentions property damage while in the premises of a hotel, but it does not go into any specifics and simply provides a general overview of such a situation without itemizing which situation the guess has the legal right to obtain an economic remuneration for any potential loss of property. In Donoghue v Stevenson the plaintiff suffered emotional, property and bodily harm due to the product the individual purchased from the company accused of the negligence. In the month of April of 1929 Mrs. Mary M'Alister knows as Donoghue accused David Stevenson, a water manufacturer of negligence due to

Corporate Collapse Case Study Part 2 Essay Example | Topics and Well Written Essays - 2000 words

Corporate Collapse Case Study Part 2 - Essay Example In USA this procedure is a part of fraud accounting but in the UK it is used to provide flexibility in the existing accounting and regulatory system of the company. The sole purpose of accounting is to provide a true and fair view to the users of the financial information (Larson, 2008). Creative accounting does not necessarily mean the violation of GAAP rules or breaching of any terms and condition of the company. The accountants generally use this concept to insert flexibility in the accounting system and deliver a true and fair view to the users of the financial report and information (Jones, 2011). Mark to Market accounting on the other hand is used for updating the value of an asset or a liability to reflect the real market value of the asset/ liability (Wolnizer, 2003). This was mainly used for transaction related to future exchange and recently it is been used by banks and other financial institutions. This method got official recognition in the year 2009 by FASB (Financial Ac counting Standard Board). This method was used to prevent inappropriate use of financial value. Companies usually use this method for assets and liabilities but it is also used for future exchanges to meet the profit margin requirements. If the margin accounts are not monitored regularly then the current market value could drop drastically below the required levels. The process of internal audit adds significant value by preventing fraud accounting within the company and improving financial control. Audit failure leads to misappropriation of funds and non detection of fraudulent activities within the company. Companies which rely on external source for internal auditing process are likely to detect less error than those who conduct the process themselves (Idowu and Caliyurt, 2012). Examples of failure in the accounting procedure One of the most controversial accounting scandals was the â€Å"Enron scandal† in which Enron Corporation, a Houston based energy, service and commod ities corporation filed for bankruptcy in October 2001. The shareholders of the company lost $74 billion and thousand of employee lost their retirement accounts and jobs. The CEO of the company Jeff Skilling and former CEO Ken had not portrayed the huge debt amount in their balance sheet. In October 2000, the share price of the company skyrocketed to $90 per share and later in the November, 2000 the stock price dipped to $1(Bierman, 2008). The stock price of the company went down because Sherron Watkins, an employer of the company had raised suspicion about the high stock prices through the whistle blowing method. The CEO of the company and his accomplice was eventually caught and were termed for 24 years in prison (Accounting Degree, 2013). This had tarnished the image of Enron Corporation completely and the management of the company who had sought plans for IPO (Initial Public Offering) for the internet department could not continue with the plans of IPO. Another similar incident which had sparked controversies in USA was popularly known as the â€Å"World com Scandal†. In the year 2000, the CEO of MCI Communications Mr. Bernie Ebbers became one of the wealthiest men in the nation even amidst the financial crisis faced by the telecom

Supply chain management Essay Example | Topics and Well Written Essays - 1500 words - 5

Supply chain management - Essay Example 3.9 billion with the people employed by the company being 31,000 across the business (Argos, 2013). Being part of the Home Retail Group, it is among the United Kingdom’s leading general and home merchandise retailer. The company came into the limelight in July 1963 and Richard Tompkins was the founding member of the firm. During this time, he had already established the Green Shield Stamp which was based in the United Kingdom. The company started out as a stamp retailer shop but after Tompkins visited Argos City in Greece, everything changed. He embarked on selling gifts on cash. He later decided to rebrand the shop and named it Argos in 1973, July. The shop started out by making sales of ?1,000,000 the same year in November (De, 2011, Pg 25). BAT company purchased the shop in 1979 for ?32 million. It is at this time that the company resolved to always remain relevant in the market by embracing all the new initiatives in order to capture more clients. Literature review The boo k that gives a clear representation of the subject on chain supply theory is Slack, N., Brandon-Jones, A., Johnston, R. & Betts, A. 2012. Operations and process management. 3rd edn, Prentice Hall/ Financial Times, London. It analyzes some of the processes that have been used by Argos and other companies in inducing the innovations of technology. The mechanism is taken into consideration in terms of social, economic and environmental prospective through the supply chain, which is in accordance with the proposals set to produce a sustainable development (Slack, Brandon-Jones, Johnston, & Betts, 2012 Pg 15). The book continues to implicate some of the roles initiated by companies in building their supply chain. The innovations correspond with new technological developments, which are used in representing the best initiative in promotion of development in companies. The book is also responsible for the avocation of the debate developed in association with sustainability, innovation and supply chain management, which are used in the concept of sustainable innovations (Slack et al, 2012 Pg 32). . The same model is used management, which is used in the gap for differentiating development initiatives and those that are seen to have flopped. The application in the book is used to explain the case studies of Argos and the manner in which the company uses the model to benefit themselves at the moment and the future. In the case study, one will realize that there is demonstration of sustainable innovations which are driven by the company at the focal representation (Jespersen & Skjott-Larsen, 2005, Pg 78). This is seen to be an establishment of engagement of its suppliers in the reduction of the negative environmental and social impacts responsible for life cycle of the product in the market. A thorough examination of the book further explains that there is a possibility of the implementation of the innovations will generate a beneficial concept which is associated with t he net environmental and social in all the major players and stages of the supply chain. It is clear that the term supply chain was rampant in the 1980s at the time that majority of the companies were fighting to join the major players in the global trade (Slack et al, 2012 Pg 72). . This has always been a word used in the implication of materials flowing from one

Reservation System Essay Example for Free

Reservation System Essay I. Introduction A hotel is an establishment that provides paid lodging on a short-term basis. The provision of basic accommodation, in times past, consisting only of a room with a bed, a cupboard, a small table and a washstand has largely been replaced by rooms with modern facilities, including en-suite bathrooms and air conditioning or climate control. The cost and quality of hotels are usually indicative of the range and type of services available. As one of the fastest growing sectors of the economy of our time, the hotel industry alone is a multi-billion pesos and growing enterprise. It is exciting, never boring and offer unlimited opportunities. The hotel industry is diverse enough for people to work in different areas of interest and still be employed within the hotel industry. But the sad things, small hotels still using a manual reservation system and they don’t have a system that can minimize their jobs like a automated database system. Even the government staff houses like NEDA staff house have the budget but still using a manual system like log books. The main targets of this study are for the employees of NEDA STAFF HOUSE. This study aim to benefit the subject of our study, it will minimize their work and can have a security for their respective files. This study will also help the proponents to enhance their knowledge in programming such as Microsoft office application as well as teamwork throughout the study. Interaction and individual stimulation have always been linked to the technological availability of the time and place. With the transition to an information-based society, computers and transactions have evolved from manual transaction. One of the solutions or alternatives to the problems that a hotel is facing, a system was being developed which can edit, delete, filter, monitor and store and secured the records of the customers. The propose system will help the staff house to decrease the work of the building administrator because they will be using a less effort like this automated system for their reservation. II. Background of the study The NEDA staff house started in 1970 so there employees from far provinces around the Philippines have a stopover in manila in case they have an appointment. Instead of accommodating in an expensive hotel, the staff house can give the same services but has a very low rate of overnight stay. For only P80 per night the staff house has a comfortable rooms and facilities that the NEDA employees can use throughout their stay. By calling the Building Administrator 5 days before they will check in and verify the reservation 2 days before check in, they can have a peaceful overnight stay at the staff house. NEDA staff house accommodating over 13 regions of NEDA Government offices all over the Philippines. Before, the staff house has 20 staff from the main office of NEDA. They were residing at the staff house to have a temporary office. But nowadays new offices of NEDA established all over the metro manila like their main office at the Pasay city so the NEDA staff house needed only 4 employees (Building administrator, 2 Security Guards, 1 Janitor). As of now the NEDA staff house is still running and accepting accommodations from there other offices aroung the Philippines. III. Statement of the problem General problem. The main problem of this study is the inaccurate reservation of the customers/NEDA Employees. Specific Problems: The specific problems are the following: 1. Low in security for file storage 2. Time monitoring are consuming 3. Less data integrity 4. Difficulty in searching and retrieving files 5. Possible loss of records and retrieving files 6. Difficulty in finding the availability of rooms IV. Objective of the study General Objective. The study aims to solve the problem encountered and to change the manual reservation system. Using the proponent’s reservation system, it will lessen the work of the Building Administrator work. It will be organize to have an automated reservation system. Specific Objective. The specific objectives are as follows: 1. To increase the security between the management and staff. 2. To lessen time consume. 3. To highly integrate data. 4. To spend less time in searching and retrieving of files. 5. To create a back up of files in every successful transaction. 6. To become make easier to find the availability rooms. V. Significance of the study This study will show how important is the automated reservation system than a manual system. It will benefit the following: Management It will help the management a lot by organizing the files properly in a small storage like a computer than a storage that is not so well secure like a storage room. They will have a report data that is easy to manage. Building Administrator The Building Administrator will benefit a lot in this project because she can manage the files by not using too much effort using a manual system. The administrator can also create a backup if something turns out wrong on the system. She can also easily update the wrong information of the customers/government employee reservation info. Security Guards The Security guards will benefit to the project because they will not need the help of the Building Administrator in case that she’s not around. They can easily access the automated reservation system because they have the authority to use the system by entering their username passwords. Other Lodging businesses This study can also help other small lodging businesses such as motels, apartelle lodging, etc to their study about automated reservation system and made them realize how important the automated reservation system in their businesses. By this research, they will know the significance of this study to their business. Future researchers It will also benefit the future researcher or students in NCBA which is taking the course of BSIS. This project gives an idea on their research about reservation system. VI. Scope and Limitations This study is conducted to know the reason behind the proponents on how will their purposed systems will help the staff house management. The Proposed System is a Reservation System that is compatible in the NEDA staff house. Because they accommodating their employees from around the Philippines, they do not have a database system that records the reservation of the employees only a log book record. This study mainly focused on providing application using computerized system that enables businesses to track services and aims to provide accurate and reliable process on every transaction especially in reservation. This study is looked into a better impact of using technology  today on how it affects our daily lives especially for being the customer. With this studies it can help our beneficiaries to know the differences of using manual system to a computerized generation today, prioritize is to prove and to give them the right information. The limitation of the system has no inventory of item used of the customer/government employees that have a reservation in the staff house. The customer cannot process a reservation online because only the Building administrator and the security guard duty on that time can access the system so they can manage some confidential files.

The Effects Of Climate Change In North America Politics Essay

The Effects Of Climate Change In North America Politics Essay Climate change is one of the biggest issues of discussion in the world today and is already affecting societies around the globe. North America, being one of the most influential areas of the planet, has the added pressure of setting the proper example in preparing its society to adjust for the possible changes to be made in regards to climate change. Given the economic power that North America holds over various countries worldwide, the decisions and actions that are taken are going to have a direct impact on the other nations as well. The US is put in a place of control when it comes to the matter of climate change, and as a result, if the US continues to deny the changes that are occurring in the world of today, other countries will continue to suffer and will not be able to take the necessary actions in order to prevent the downfall of their own societies. Actions are starting to be taken by both the government and non-governmental organizations, who are trying to inform the gene ral public on what the current situation is with climate change and the possible outcomes. There is a clear effort being made to help slow down, or even prevent climate change from making a large impact on society, but if there is a major impact, unfortunately society will not be able to cope accordingly. The programs to prepare society for the worst to come exist, but there is not enough focus on these programs to get the message across. If this information is not distributed around the world, and if this subject is not taken seriously, human civilization could very well already be on its way to downfall. North America is taking steps in order to prepare its population for change in order to deal with climate change and make sure that society is affected as little as possible. In order for the world to be able to tackle the subject of climate change, all nations will have to come together and educate their own people on the dangers and potential problematic outcomes of this ongoing shift in the worlds climate, starting with the United States. The governments of North America have programs which are made to inform the general public about the current situation of climate change; however, there is not enough emphasis put on these programs to convey this message to societies. It is a known fact that climate change is one of the main issues of discussion in the world today, and that it is going to take a global effort in order to get results. North America is one of the leading polluters of today, and therefore it is extremely important for the US to be aware of what is happening in terms of climate change. The United States government has programs that are specifically designed to inform the general public about what is going on with climate change and what can be done to prevent it, cope with it, and prepare for the worst. This is despite the fact that the reports of several governmental agencies in the United States and around the world cite human activity as one of, if not the primary driver of global climate change, (Nag el et al, 2008). The programs exist, the government is aware of what needs to be done, but there is simply not enough focus on these programs. For example, on June 16th, 2009, the White House helped launch the Global Climate Change Impacts on the United States report, which is a representation of thirteen agencies that, in the course of a year and a half, focused on potential climate change impacts on the United States. Yet, a large group of the United States public is completely unaware of the fact that this report was written. Sadly, the government knows this and even takes it into account, as stated in the document Responses to climate change impacts in the United States will almost certainly evolve over timeà ¢Ã¢â€š ¬Ã‚ ¦ Implementing these response strategies will require careful planning and continual feedback on the impacts of policies for government, industry, and society, (Waple, 2009). Non-governmental organizations are the ones at the front lines, informing the general p ublic one person at a time, letting people know what steps need to be taken in order to cope with, or even prevent climate change. Even though these organizations are putting in the hours of effort to inform the public, the majority of people shy away from the NGOs and choose to not take them seriously and not regard this as a real problem that will eventually have an impact on the world. In order for the human race to respond appropriately to the results that climate change will have on society, people have to be made aware of the expected outcomes. As stated by the National Assessment Synthesis Team in Washington, D.C. Climate change will affect different segments of society differently because of their varying exposures and adaptive capacities (NAST, 2000). There are many different environmental issues that the world is being faced with. Some are local, where others will have an impact on a global scale. Environmental issues are comprised of social interactions and natural phenomena, in this sense, they are hybrid issues of society and the environment, (Giddens, 2009). Due to the amplification of social awareness dealing with environmental problems in the 1970s, sociology has focused part of its reasearch on global climate change, known as environmental sociology. Environmental sociologists study the complex and versatile relationship between human beings and their natural environments, which also covers the question of why social systems have a tendency to exceed their ecological carrying capability. The report done on understanding climate change suggests that there are certain areas of research that scientists must take as a priority. These areas include 1) human activities that alter the earths environment; 2) forces that drive these activities; 3) consequences of environmental changes for societies and economies; and 4) how humans respond to these changes, (Nagel et al, 2008).The main issues that the world has to deal with are pollution and waste, resource depletion, genetic modification of food, and global warming. Air pollution clearly has a global influence, and is mainly caused by outdoor pollution, produced mainly by industrial pollutants, and indoor pollution, causes by burning fuels at home such as heating. Human societies depend on natural resources from the planet wood, water, plant life, animals. These are mainly classified as renewable resources, however, if there is no balance between consumption and reproduction, there is a risk that there will be no more left. Rapid population and economic growth in the arid and semi-arid regions of Southern California, the central valley of California, and the front range of the Rocky Mountains has radically increased exposure to water shortages (NAST, 2000). Along with consumption rates, population shifts and development choices are making more Americans vulnerable to the expected impacts of climate change, (NAST, 2000). North America being one of the more heavily populated areas in the world also raises the vulnerability of the specific regions that are densly populated. The four most populous states in 2000 California, Texas, Florida, and New York accounted for 38 percent of the total growth in U.S. population during that time, and share significant vulnerability to coastal storms, severe drought, sea-level rise, air pollution, and urban heat island effectsà ¢Ã¢â€š ¬Ã‚ ¦Over 80 percent of the U.S. population resides in urban areas, which are among the most rapidly changing environments on Earth, (N AST, 2000). In some cases the negative outcomes of climate change do not directly affect North America, but the nations that supply North America with their export. Which in turn also has a negative affect on North America. The main component of climate change, which is global warming, has the most noticeable impact on societies, scientists have recently estimated that global warming kills about 160,000 people every year (Giddens, 2009). In general, the groups of people that are going to be affected the most are the youth, the elderly, and the economically disadvantaged (NAST, 2000). This is due to the fact that people who are at a disadvantage, socially and monetarily, are unable to acquire the resources necessary in order to cope with these changes. The rise in global temperatures during the summer and the fall of temperatures during the winter are at an all time high and low, respectively, and human beings are not prepared to the best of their abilities, and consequently human beings are the ones who are losing the battle against the shift in climate. Another problem area that is beginning to arise is that of health and the mutation of pre-existing disease and viruses, public health researchers have begun to note variations in seasonal diseases, like the flu, and the geographic spread of malaria and diarrheal diseases resulting from ill-equipped sanitation services and a lack of access to clean, fresh water, (Nagel et al, 2008).Yet, with these facts, there is still no drastic change or effort being made to prevent this from happening; and there is further research that must be done before scientists will be able to estimate how much these changes will result in negative societial outcomes. Other areas of the world are also making an effort to inform the general public about climate change and the potential changes that will have to be made in order to prevent negative outcomes. The Kyoto Protocol was created in 1997, in Kyoto, Japan and was put into action in February 2005, and since then 187 states have signed the protocol. The Kyoto protocol is a convention that was created in an attempt to fight global warming and lower greenhouse gas emissions by restricting countries gas emission percentages. Ironically enough, the United States is the only nation that has not signed and has no intention to ratify the protocol. The Kyoto Protocol was created when George W. Bush was still president of the US, and he was of the firm opinion that climate change not only was not a problem, but did not even exist as an important global issue. As a result, the US has been put far behind the rest of the world in terms of acknowledging and acting on this matter. This is a set-back to the global effort in fighting climate change and will continue to create problems, in the long run, if there is no agreement reached on this subject shortly. If information about climate change does not reach the majority part of the planets population or the subject is not kept in mind with the main events that are yet to come, human civilization may as well accept the steady downfall of our planets wellbeing. With North America continuing to play its role in the world regarding the issues of climate change, noticeable actions need to be taken for the prevention of climate change, from a societal perspective. The reactions to the impacts of climate change in North America will transform over time as people learn more about what they are dealing with, and the extent to which it will affect the population. In addition, there have to be more comparative studies of the political dynamics of climate change across multiple nations. Evidently, this is not left up to the hand full of people in a position of power in the world to do; there are other factors that can also contribute to this evolution. Cultural habits, religion, and personal norms and values are able to influence the majority, if not, everything from population growth to beliefs about the environment as a whole. There has to be a better understanding of how and where these social groups stand, in terms of the global movement, towards a better environment, and how the general public, political powers, and non-governmental organizations can work together to effectively improve it. North America has huge potential to deal with these issues, compared to other countries in the world, however their methods of informing the population and the advice that they give to their people as a means of being able to improve their situations is not yet at its best. Although North America has considerable adaptive capacity, actual practices have not always protected people and property from adverse impacts of climate variability and extreme weather events, (Parry et al, 2007). There is still much that must be shared between people of power and people who belong to those societies. Climate change is a real issue that will eventually affect the entire world, and measures must soon be taken, on a serious level, if societies worldwide are to try and overcome this new life threatening obstacle.

The 1960s :: American America History

The 1960s Mr. Basiuk is the person I chose for my interview. Rather than immigrating to Canada, Mr. Basiuk was born in Canada, Winnipeg, Manitoba, in 1936. He was educated in high school to the north end of Winnipeg at St. John's Technical High School. He spent two years altogether in grade 10 and 11 then attended five years in the University Of Manitoba and graduated as an electrical engineer. Unfortunately, he was not able to find a job in this profession in this area, and therefore began his career as a teacher; and has been teaching for the last thirty years. Interview Who was in political power and how affective was he in accomplishing his goals? I wasn't really interested nor paid much attention to politics, therefore I cannot answer this question. What things did you want to see changed by the government? What sort of problems did the government face and how were they solved? I wanted to see the government have more concern for the poor people. Things such as Medicare, OHIP, and pension plans. The government faced many problems, one of the most toughest, I think, was the deep recession occurring in the 60's. What special events or figures were most significant to you? Name some of the social trends you took part in. Well, I didn't have any hero's or someone to look up to until later on in my 20's when someone invited me to Montreal to watch a folk singer called Pete Seager. From this time on, I became really dedicated and interested in music and this really influenced my life. I was a teacher than, so I didn't really take part in social events, yet there was a building north of Jarvis called Yorkville and teenagers would usually gather there to dance and have fun. I would occasionally go to that place. State the differences in fashion from the 60's and today. Which music group or band did you enjoy listening to? What types of dances did you enjoy? First of all, teenagers and especially woman would wear clothes with more colour and beads. Bellbottoms were in back at that time. There are certain people who wear lots of flowers and turned out to be called the flower power. This name was given because they believed that being "nice" to others would help change the country-so they gave many people flowers and asked them to be their friend. The 1960s :: American America History The 1960s Mr. Basiuk is the person I chose for my interview. Rather than immigrating to Canada, Mr. Basiuk was born in Canada, Winnipeg, Manitoba, in 1936. He was educated in high school to the north end of Winnipeg at St. John's Technical High School. He spent two years altogether in grade 10 and 11 then attended five years in the University Of Manitoba and graduated as an electrical engineer. Unfortunately, he was not able to find a job in this profession in this area, and therefore began his career as a teacher; and has been teaching for the last thirty years. Interview Who was in political power and how affective was he in accomplishing his goals? I wasn't really interested nor paid much attention to politics, therefore I cannot answer this question. What things did you want to see changed by the government? What sort of problems did the government face and how were they solved? I wanted to see the government have more concern for the poor people. Things such as Medicare, OHIP, and pension plans. The government faced many problems, one of the most toughest, I think, was the deep recession occurring in the 60's. What special events or figures were most significant to you? Name some of the social trends you took part in. Well, I didn't have any hero's or someone to look up to until later on in my 20's when someone invited me to Montreal to watch a folk singer called Pete Seager. From this time on, I became really dedicated and interested in music and this really influenced my life. I was a teacher than, so I didn't really take part in social events, yet there was a building north of Jarvis called Yorkville and teenagers would usually gather there to dance and have fun. I would occasionally go to that place. State the differences in fashion from the 60's and today. Which music group or band did you enjoy listening to? What types of dances did you enjoy? First of all, teenagers and especially woman would wear clothes with more colour and beads. Bellbottoms were in back at that time. There are certain people who wear lots of flowers and turned out to be called the flower power. This name was given because they believed that being "nice" to others would help change the country-so they gave many people flowers and asked them to be their friend.

The Constitution of the United States Essay -- Papers History USA Gove

The Constitution of the United States When the Constitution of the United States was first created in 1787, its purpose was to unify our country. However, by 1850, the United States had become 'source of sectional discord and tension and ultimately contributed to the failure of the union it had created.' What happened during the 63 years after it was first established to 'contribute to the failure of the union it had created?' One must look at what the Constitution promoted to make the country unified and what it did to make it disunified. Compromises such as 3/5, the Missouri, and the tariff of 1850 all helped to unify and shape our country. However, compromises such as the Fugitive Slave Law, Popular Sovereignty, and the slave trade all led to disunify our country. The large populous states naturally wanted the number of representatives in the new Congress to be based on population. The Virginia Plan provided that there would be two houses of Congress and that in each one representation would be based on population. Li ke many other ideas that have made history, it was remarkably simple. Why not divide the Congress into two houses? In one house (the Senate) each state, regardless of population, would have the same number of representatives. In the other house (the House of Representatives) each member would represent the same number of people. 'Quite appropriately this came to be called the Great Compromise. Other major compromises came on slavery and on the control of commerce. The southern states, where the slaves were really treated as property, still wanted the slaves counted as people for the purposes of representation in the New House of Representatives. Some delegates argued that if one kind of property was counted f... ... a truce that announced the opening of fight to the finish. The Missouri Compromise preserved sectional balance for over 30 years and provided time for the nation to mature. The Fugitive Slave Law however, helped lead to the disunification of both the country and the Constitution. The F.S.L. stated that any captured person who claimed to be a free black and not a runaway slave was denied the right to trial by jury. Popular Sovereignty held the greatest possibility maintaining the unity of the Democratic Party and national unity, but that like a lot of other things was proven to be wrong. Buchanan presumably premeditated the Dred Scott Decision but no one really proved it. In conclusion, like stated in the thesis, there were many factors that led to the nation's sectional discord and the unity within the nation. Some of which are still around today but work better.

Mussolini and Hitler Essay -- essays research papers

Benito Mussolini and Adolf Hitler As World War II (WWII) approached, Mussolini announced his intention of annexing Malta, Corsica, and Tunis. He spoke of creating a "New Roman Empire" that would stretch east to Palestine and south through Libya and Egypt to Kenya. In April 1939, after a brief war, he annexed Albania, a campaign which strained his military. His armed forces are generally considered to have been unprepared for combat when the German invasion of Poland led to World War II. Mussolini thus decided to remain 'non-belligerent' until he was quite certain which side would win. On June 10, 1940, as the Germans under General Guderian reached the English Channel, Mussolini declared war on Britain and France. In October, Italy attacked Greece and lost in result 1/3 of Albania, until Germany attacked Greece as well. In June 1941, he declared war on the Soviet Union and in December he declared war on the United States. Following Italian defeats on all fronts and the Anglo-American landing in Sicily in 1943, most of Mussolini's colleagues (Count Galeazzo Ciano, the foreign minister and also Mussolini's son-in-law, included) turned against him at a meeting of the Fascist Grand Council on July 25, 1943. King Vittorio Emanuele III called Mussolini to his palace and stripped the dictator of his power. Upon leaving the palace, Mussolini was swiftly arrested. He was then sent to Gran Sasso, a mountain recovery in central Italy (Abruzzo), in complete isolation. Mussolini was subst...

Design a Repeater for Digital Rf Signal

Abstract Repeaters for digital TV broadcasting can use either analogue or digital techniques. The purpose of using repeater is to boost signals into areas of weak coverage in any radio communication system. However wave interference means the repeater usually requires a frequency shift for analogue modulated signal. For digitally modulated signal it may be possible to use same frequency. This paper investigated and designed a RF repeater which will improve the inter symbol interference by incorporating delay between received and transmit signal.This project also reviewed the basics of current Digital Video Broadcasting-Terrestrial (DVB-T) techniques and selected it as a suitable choice for lab experiment. The practical side of this project is to design and build a repeater incorporating suitable electrical delay. Contents 1. 0 Introduction4 1. 1 Background:4 1. 2Aim of this project6 1. 3Project objectives6 1. 3 Project deliverable7 2. 0 Problem analysis8 2. 1 Repeater8 2. 1. 1 Analog ue repeaters9 2. 1. 2 Digital repeaters10 2. 2 Inter symbol interference13 2. 3 Multipath propagation15 2. 3. 1 Multipath fading15 2. 4 The TV channels16 2. 5 Transmission cable18 . 6 Signal Amplifiers20 2. 7 Transmission delay (Coaxial cable)21 3. 0 Possible solution24 3. 1 RF amplifier25 3. 1. 1 The Transistor Amplifier26 3. 1. 2 Ultra High Frequency Transistor Array (HFA)29 3. 1. 3 Surface mounts technology:32 3. 1. 4 Surface Mount Monolithic Amplifier:32 3. 1. 5 Loft box: 8 way home distribution unit34 3. 2. 6 Maxview signal booster35 3. 2. 7 Antenna:36 4. 0 Design37 4. 1 Circuit design37 4. 2 PCB design38 5. 0 Implementation40 5. 1 Implementation with HFA312740 5. 2 Implementation with MAV-11SM amplifier41 6. 0 Test result42 6. 1 Laboratory test result42 6. 2 Field test result44 7. Result Discussion46 8. 0 Conclusion48 Future work:49 Works Cited50 Figure List Figure 1System block diagram6 Figure 2 Passive and Active repeater block diagram7 Figure 3 Analog repeater8 Figure 4 Dig ital repeater9 Figure 5 Channel management for digital repeater10 Figure 6 Channel management for analogue repeater10 Figure 7 Broadcast in valley with digital repeaters11 Figure 8 101101 transmitted data12 Figure 9 Received data12 Figure 10 Transmitted data vs. Received data13 Figure 11 Multipath propagation14 Figure 12 Cable loss in dB   (Antenna basics, 2008)18 Figure 13 Linear change phase vs frequency22Figure 14 The basic transistor amplifier26 Figure 15 HFA3127 transistor array30 Figure 16 MAV-11SM amplifier31 Figure 17 Suggested PCB layout with MAV-11SM33 Figure 18 Loft box home distributor33 Figure 19 Maxview signal booster35 Figure 20 Antenna used for this project35 Figure 21 Interference between relay signal and main transmitted signal36 Figure 22 ISIS schematic of circuit design37 Figure 23 PCB design according to the datasheet in ARES37 Figure 24 3D view for PCB38 Figure 25 Circuit with HFA3127 amplifier39 Figure 26 MAV-11SM amplifier circuit board40 Figure 27 HFA3127 gain with soldering error41Figure 28 HFA3127 amplifier gain41 Figure 29 One MAV-11SM amplifier gain42 Figure 30 Two MAV-11SM amplifier circuits give more gain42 Figure 31 Three amplifiers together was the maximum gain43 Figure 32 Low quality picture with normal antenna43 Figure 33 Picture with repeater connected antenna44 Figure 34 Rebroadcasting connection44 1. 0 Introduction 1. 1 Background: Digital Video Broadcasting (DVB) is being adopted as the standard for digital television in many countries. The DVB standard offers many advantages over the previous analogue standards and has enabled television to make a major step forwards in terms of its technology.Digital Video Broadcasting, DVB is now one of the success stories of modern broadcasting. The take up has been enormous and it is currently deployed in over 80 countries worldwide, including most of Europe and also within the USA. It offers advantages in terms of far greater efficiency in terms of spectrum usage and power utilisa tion as well as being able to affect considerably more facilities, the prospect of more channels and the ability to work alongside existing analogue services. (Pool, 2002) In these days when there are many ways in hich television can be carried from the â€Å"transmitter† to the â€Å"receiver† no one standard can be optimised for all applications. As a result there are many different forms of the Digital Video Broadcasting, DVB, standards, each designed for a given application. The main forms of DVB are summarised below: DVB Standard| Meaning| Description| DVB-C| Cable| The standard for delivery of video service via cable networks. | DVB-H| Handheld| DVB services to handheld devices, e. g. mobile phones, etc. | DVB-RSC| Return satellite channel| Satellite DVB services with a return channel for interactivity. DVB-S| Satellite services| DVB standard for delivery of television / video from a satellite. | DVB-SH| Satellite handheld| Delivery of DVB services from a satelli te to handheld devices| DVB-S2| Satellite second generation| The second generation of DVB satellite broadcasting. | DVB-T| Terrestrial| The standard for Digital Terrestrial Television Broadcasting. | Digital Video Broadcasting- Terrestrial (DVB-T) : The common perception of digital television these days is of broadcasts emanating from signal towers, bouncing off satellites, and being beamed to home receivers.This is the magic of  satellite  transmission, and it is reliable as long as the view of those satellites is not obscured. However, this is not the only way in which television signals are transmitted. Another popular method of transmitting signals  digital video broadcasting–terrestrial (DVB-T). When broadcasters employ this method, the digital signals do not leave the earth. The signals transmitted using  DVB-T  do not travel via cable, though; rather, they go from  antenna to aerial antenna, from signal blaster to home receiver. Digital signals are routinel y transmitted using terrestrial methods.The transmission method has different names in different parts of the world. DVB-T  is the name used in Europe and Australia. North American customers receive these signals using a set of standards approved by the Advanced Television Systems Committee (ATSC). In Japan, it is known as Integrated Services Digital Broadcasting–Terrestrial (IDSB-T). DVB-T  broadcasters transmit data using a compressed digital audio-video stream, with the entire process based on the  MPEG-2 standard. These transmissions can include all kinds of digital broadcasting, including  HDTV  and other high-intensity methods.This is a vast improvement over the old analog signals, which required separate streams of transmission. Oddly enough, some  DVB-T  transmissions take place over analog networks, with the antennas and receivers getting some helpful technological upgrades along the way. (Pool, 2002) 1. 2 Aim of this project The aim of this project is to investigate the design of a repeater for DVB-T system but incorporating a delay between receives and transmits signals to avoid Inter Symbol Interference (ISI). It is useful to use a repeater to boost the signal into areas of weak coverage in any radio wave communication system.However wave interference means the repeater usually requires a frequency shift for analogue modulated signals. For digitally modulated signals it may be possible to use the same frequency. The project will review the basics of current digital systems such as DVB (Broadcast TV) and WLAN – and to identify a suitable choice for a lab experiment. The practical side will be to design and build a repeater incorporating suitable transmission delay. 1. 3 Project objectives 1. Investigate and learn Inter Symbol Interference effect on received signal. 2.Investigate and learn the delay effect on received signal and cause of the delay. 3. Investigate and learn Multipath propagation and Doppler shift of the fre quencies. 4. Investigate and learn about Digital Video Broadcasting (DVB) techniques. 5. Investigate and learn about transmission delay of coaxial cable. 6. Investigate and learn about different type of Amplifier. 7. Designing repeater circuit. 8. Implementing circuit. 9. Testing the circuit. Figure 1System block diagram 1. 3 Project deliverable * System design * Circuit design * Documentation 2. 0 Problem analysis . 1 Repeater Repeaters provide an efficient solution to increase the coverage of the broadcasting networks. In the broadcasting networks, the network operators usually first put high power transmitters at the strategic points to quickly ensure an attractive coverage and then, in a second step, increase their coverage by placing low-power repeaters in the dead spot or shadow areas, such as a tunnel, valley or an indoor area. A repeater is simply a device that receives an analogue signal or a digital signal and regenerates the signal along the next leg of the medium.In DVB- T networks, there are two different kinds of repeaters. They are passive repeaters, which are also called as gap-fillers and active repeaters that are also called as regenerative repeaters. A passive repeater receives and retransmits a DVB-T signal without changing the signalling information bits. The signal is only boosted. An active repeater can demodulate the incoming signal, perform error recovery and then re-modulates the bit stream. The output of the error recovery can even be connected to a local re-multiplexer to enable insertion of local programmes.This means that the entire signal is regenerated. The building blocks of the passive and active repeater configurations are shown in Figure 1. Figure 2 Passive and Active repeater block diagram In a first step, DVB-T broadcasters, as all broadcasters, launch their networks with high power transmitters in strategic point in order to quickly insure an attractive coverage to TV operators and then, in a second step, increase their co verage by placing low power repeaters in shadow area. To repeat a DVB-T signal, two solutions can be used: An analogue repetition: in this case, repeaters use well-known techniques such as down conversion, filtering, up conversion and amplification. The signal is only boosted. * A digital repetition: this new type of repeater uses a professional DVB-T receiver to recover the programme stream (and correct all errors) carried in the RF channel, performs a new modulation followed by an up conversion and amplification. It means that the entire signal is regenerated. 2. 1. 1 Analogue repeaters In case of analogue repetition, the output signal quality cannot exceed the quality of the received signal because the signal is not regenerated.Figure 3 Analog repeater Furthermore, being a passive process, it degrades the signal; the phase noise of the local oscillator involves a degradation of the phase noise of the received signal and creates an inter-modulation. The local oscillator phase nois e adds to the phase noise of the received signal. In these conditions, what are the performances of analogue repetition for Modulation Error Ratio (MER) and Carrier to Noise ratio (C/N)? Of course, performances are linked to the technology but analogue repetition cannot be insured ad infinitum. And, if one link in the analogue repetition chain is weak, all the system is deficient. Trolet, 2002) 2. 1. 2 Digital repeaters In case of a digital repetition, the entire signal is regenerated; it means that repeaters, as transmitters, insure the quality of the broadcasted signal as long as it is able to demodulate it. Figure 4 Digital repeater The output signal quality is independent of the input signal quality: * Phase noise is linked to the local oscillator only, * A weak link, in a digital repetition chain, is erased by the following repeater, * Several digital repeaters can be cascaded without any cumulative degradation.Drawback of Digital repeater The delay inside a digital repeater is taller than the guard interval. So, the signal cannot be repeated on the frequency of the main transmitter: main transmitters and repeaters cannot operate in a Single Frequency Network (SFN) even with 8K carriers and a guard interval of 1/4. (Trolet, 2002) Figure 5 Channel management for digital repeater The delay inside an analogue repeater is lower than the guard interval and allows main transmitters and repeaters to operate in SFN mode. Figure 6 Channel management for analogue repeaterBut, with such technique, overlap between repeater cells and transmitter cell cannot be optimised/adjusted. Analogue repeaters have not the possibility to buffer the signal; they cannot add delay to move the overlap zone. To optimise single frequency network with this technique, two solutions: * Move the repeater that means you have to find new broadcasting site. * Reduce the output power of your repeaters and forbid overlap. So, to build an efficient Single Frequency Network (SFN), Broadcasters ha ve benefits in using transmitters: * Means more freedom for defining the size of the cells Means more freedom for defining the repeater locations Benefits of Digital Repeater * As long as the repeater is able to demodulate the RF channels, signal quality is independent of input signal quality. * Output MER > 33 dB (Trolet, 2002) * In theory, thanks to the forward error correction (FEC) and the output signal quality, digital repeaters can be cascaded ad infinitum. It is an efficient solution to broadcast in valleys. TV viewers and distant repeaters share the broadcasted signal. Figure 7 Broadcast in valley with digital repeaters The demodulation process, down to the programme stream, allows broadcasters to insert a local multiplexor in order to customize the content for a local broadcasting. More and more, local communities claim their local programmes. Digital repeaters offer a flexible solution to the network. * Shadow area can be covered by several repeaters. Repeaters operate tog ether in SFN mode without any external references (10 MHz and 1 PPS) (Trolet, 2002). In their internal memory, digital repeaters can buffer the signal so as to optimise overlaps. 2. 2 Inter symbol interferenceInter-symbol interference (ISI) is an unavoidable consequence of both wired and wireless communication systems. Morse first noticed it on the transatlantic telegraph cables transmitting messages using dots and dashes and it has not gone way since. He handled it by just slowing down the transmission. Amplitude Time Figure 8 101101 transmitted data Figure 8 shows a data sequence, 1,0,1,1,0, which wish to be sent. This sequence is in form of square pulses. Square pulses are nice as an abstraction but in practice they are hard to create and also require far too much bandwidth. Amplitude TimeFigure 9 Received data Figure 9 shows each symbol as it is received. It also shows what the transmission medium creates a tail of energy that lasts much longer than intended. The energy from sym bols 1and 2 goes all the way into symbol 3. Each symbol interferes with one or more of the subsequent symbols. The circled areas show areas of large interference. Amplitude Time Figure 10 Transmitted data vs. Received data Fig. 3 shows the actual signal seen by the receiver. It is the sum of all these distorted symbols. Compared to the transmitted signal, the received signal looks quite indistinct.The receiver does not actually this signal; it sees only the little dots, the value of the amplitude at the timing instant. Symbol 3, this value is approximately half of the transmitted value, which makes this particular symbol is more susceptible to noise and incorrect interpretation and this phenomena is the result of this symbol delay and smearing. This spreading and smearing of symbols such that the energy from one symbol effects the next ones in such a way that the received signal has a higher probability of being interpreted incorrectly is called Inter Symbol Interference or ISI.ISI can be caused by many different reasons. It can be caused by filtering effects from hardware or frequency selective fading, from non-linearity and from charging effects. Very few systems are immune from it and it is nearly always present in wireless communications. Communication system designs for both wired and wireless nearly always need to incorporate some way of controlling it. The main problem is that energy, which is been wishing to confine to one symbol, leaks into others. So one of the simplest things can be done to reduce ISI is to just slowing down the signal.Transmitting the next pulse of information only after allowing the received signal has damped down. The time it takes for the signal to die down is called delay spread, whereas the original time of the pulse is called the symbol time. If delay spread is less than or equal to the symbol time then no ISI will result, otherwise yes. (Charan, 2002) Slowing down the bit rate was the main way ISI was controlled on those ini tial transmission lines. Then faster chips came and allowed to do signal processing controlling ISI and transmission speeds increased accordingly. . 3 Multipath propagation Multipath propagation is caused by multipath receptions of the same signal. in city environment or indoors signal travels along different path from transmitter (Tx) to receiver (Rx). * Signal components received at slightly different times (delay) * These components are combined at Rx * Results as a signal that varies widely in amplitude, phase or polarization 2. 3. 1 Multipath fading When the components add destructively due to phase differences amplitude of the received signal is very small.At the other times the components add constructively the amplitude of received signal is large. This amplitude variations in the received signal called signal fading, are due to the time-variant characteristics of the channel. Relative motion between Tx and Rx (or surrounding objects causing e. g. reflection) causes random f requency modulation. Figure 11 Multipath propagation Each multipath component has different Doppler shift. The Doppler shift can be calculated by using: fd=V? cos? V is the velocity of the terminal ? is the spatial angle between the direction of motion and the wave ? is the wavelengthThe three most important effects of multipath fading and moving scatters are * Rapid changes in signal strength over a small travelled distance or time interval * Random frequency modulation due to varying Doppler shifts on different multipath signals. * Time dispersion (echoes) caused by multipath propagation 2. 4 The TV channels Hertz  (Hz) means  cycles per second. (Heinrich Hertz was the first to build a radio transmitter and receiver while understanding what he was doing. )  Ã‚  KHz means 1000 Hertz, MHz means 1,000,000 Hertz, and GHz means 1,000,000,000 Hertz The radio frequency spectrum is divided into major bands:Frequency  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Wave length  (in meters) VLF  Ã‚  Ã‚  Ã‚  Ã‚  very low frequency  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  3 KHz – 30 KHz  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   100 Km – 10 Km LF  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  low frequency  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   30 KHz – 300 KHz  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚      10 Km – 1 Km MF  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  medium frequency  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  300 KHz – 3 MHz  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   1 Km – 100 m HF  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  high frequency 3 MHz – 30 MHz  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   100 m – 10 m VHF  Ã‚  Ã‚  Ã‚  very high frequency  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  30 MHz – 300 MHz  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   10 m – 1 m UHF  Ã‚  Ã‚  Ã‚  ultra high frequency  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  300 MHz â €“ 3 GHz  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   1 m – 100 mm SHF  Ã‚  Ã‚  Ã‚  super high frequency  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   3 GHz – 30 GHz  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚      100 mm – 10 mm EHF  Ã‚  Ã‚  Ã‚  extremely high frequency  Ã‚  Ã‚  Ã‚   30 GHz – 300 GHz  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   10 mm – 1 mm (Antenna basics, 2008) The UK uses UHF for terrestrial television transmissions, with both PAL-I analogue broadcasts and DVB-T digital broadcasts sharing the band. The following table is a handy channel/frequency conversion table showing the E channel number, PAL-I vision and sound carrier frequencies, and the centre frequency for digital tuning. The frequency plan for the UK involves each channel having an 8MHz bandwidth – the space in the spectrum that each channel is allotted. The PAL-I standard specifies a video bandwidth of 5. 0 MHz and an audio carrier at 6 MHz.The DVB-T tran smissions must fall within this channel plan, resulting in each digital channel also having a bandwidth of 8 MHz. Unlike PAL-I, the digital channel (carrying a multiplexed signal) utilises the entire bandwidth available to it simultaneously, transmitting 2048 carriers (in â€Å"2k mode†). For tuning purposes, a centre frequency is used (Table is included in appendices). (digital spy, 2009) Decibels Decibels (dB) are commonly used to describe gain or loss in circuits. The number of decibels is found from: Gain in dB = 10*log(gain factor)  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  or (Antenna basics, 2008) In some situations this is more complicated than using gain or loss factors. But in many situations, decibels are simpler.For example, suppose 10 feet of cable loses 1 dB of signal. To figure the loss in a longer cable, just add 1 dB for every 10 feet. In general, decibels let add or subtract instead of multiply or divide. Noise Whether a signal is receivable is determined by the  signal t o noise ratio  (S/N). For TVs there are two main sources of noise: 1. Atmosphere noise. There are many types of sources for this noise. A light switch creates a radio wave every time it opens or closes. Motors in some appliances produce nasty  RF  (radio frequency) noise. 2. Receiver noise. Most of this noise comes from the first transistor the antenna is attached to. Some receivers are quieter than others. 2. Transmission cable Twin lead (ribbon cable) used to be common for TV antennas. It has its advantages. But due to its unpredictability when positioned near metal or dielectric objects, it has fallen out of favour. Coaxial cable is recommended. It is fully shielded and not affected by nearby objects. Transmission cable has a feature called its  characteristic impedance, which for TV coax should always be 75 ohms. Although rated in ohms, this has nothing to do with resistance. A resistor converts electric energy into heat. The â€Å"75 ohms† of a coaxial cable does not cause heat. Where it comes from is mathematically complicated and beyond our scope here.But coax also has ordinary resistance (mostly in the center conductor) and thus loses some of the signal, converting it into heat. The amount of this dissipation (loss) depends on the frequency as well as the cable length. Type:  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Centre conductor:  Ã‚  Ã‚  Ã‚  Cable diameter:   Ã‚  Ã‚  Ã‚  RG-59  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  20-23 gauge  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  0. 242 inches   Ã‚  Ã‚  Ã‚  RG-6  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  18 gauge  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  0. 265 inches   Ã‚  Ã‚  Ã‚  RG-11  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  14 gauge  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  0. 405 inches Figure 12 Cable loss in dB   (Antenna basics, 2008) The above chart is only approximate. There are many cable manufacturers for each type and there is no enforcement of stand ards. If the mast-mounted amplifier gain exceeds the cable loss then it shouldn’t matter what cable you use.But there are two problems with this: * Some cable has incomplete shielding. This is most common for RG-59, another reason to avoid it. * When the cable run is longer than 200 feet, the low-numbered channels can become too strong relative to the high-numbered channels. In this case, RG-11 or an ultra-low-loss RG-6 is recommended. (These alternatives are expensive. )  Ã‚  Alternatively, frequency compensated amplifiers will work. 2. 6 Signal Amplifiers There are two types of signal amplifiers: Preamplifiers  Ã‚  (Mast-mounted amplifiers)  Ã‚  Ã¢â‚¬â€œÃ‚  Ã‚  These should be mounted as close to the antenna as possible. Usually the amplifier comes in two parts: 1. The amplifier.This is an outdoor unit that is normally bolted to the antenna mast. It must have a very low noise figure, and enough gain to overcome the cable loss and the receiver’s noise figure. 2. The power module (power injector). This is an indoor unit that commonly lies on the floor behind the TV. It is inserted into the antenna cable between the amplifier and the TV. This module injects some power, usually DC, into the coaxial cable where the amplifier can use it. The power injector is the amplifier’s power supply. Distribution amplifiers  Ã‚  Ã¢â‚¬â€œÃ‚  Ã‚  These are simple signal boosters. They are often necessary when an antenna drives multiple TVs or when the antenna cable is longer than 150 feet.Distribution amplifiers don’t need to have a low noise figure, but they need to be able to handle large signals without overloading. Commonly, distribution amplifiers have multiple outputs. (Unused outputs usually do not need to be terminated. ) Never feed an amplifier output directly into another amplifier. There should always be a long cable between the preamplifier and the distribution amplifier. Placing the two amplifiers close together can cause overloa d and/or oscillation. A mast-mounted amplifier’s most important characteristic is its noise level, usually specified by the  noise figure. But many manufacturers don’t take this number seriously. If it is given at all, it is often wrong. If all makers don’t do them right then comparison-shopping is not possible.The author is inclined to rate amplifiers for their noise figures as follows:   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  0. 5 dB  superb (anything better runs into thermal atmospheric noise)   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  2. 0 dB  excellent 4. 0 dB  fair 6. 0 dB  poor 10 dB  awful 2. 7 Transmission delay (Coaxial cable) Transmission lines are described by their two most important characteristics: the characteristic impedance Zo and the delay. For instance, a â€Å"short† (say 0. 01 wavelength) piece of coaxial cable such RG-58U has been taken and measured its capacitance with the other end open. A one foot length yields more or less 31. 2 pF. The inductance also has been measured with the other end shorted. It yields 76. 8 nH. The impedance may now be computed as: Zo=LC Zo=76. ? 10-931. 2? 10-12=49. 6 ohms Here L and C are measured for the same length. The delay may also be computed: Delay= L? C Delay= 76. 8? 10-9? 31. 2? 10-12=1. 55 nSec For an ideal line, the delay increases linearly with its length, while its impedance remains constant. After that it has been computed the velocity in foot per second: V=lendelay V=11. 55? 10-9=6. 46? 108 foot per second or meters/second 8 10*966. 1 This is less than the speed of light. The ratio of the above speed to the speed of light gives the velocity factor Vf: Vf=1. 966? 1082. 998? 108=0. 666 or 66. % of the speed of light As mentioned earlier, the delay increases linearly with the line length. For a given length, the phase difference between the input and output will increase with the frequency: ? =2? f? delay Here the phase ? is in radians and the frequency f is Hertz. Converting the phase from ra dians to degrees requires multiplying by: 3602? In this case if frequency is 900 MHz so phase delay will be ?deg=f? 360? delay=900? 106? 360? 1. 55? 10-9? 502. 2 This length that gives 90 degrees of phase shift is also known as a quarter wavelength. Figure 13 Linear change phase vs frequency Figure-13 An ideal transmission line gives a linear change of phase versus frequency.The distributed inductance and capacitance are the basic transmission line parameters. From these, it can be calculated the line impedance, the delay in terms of time and phase, the speed of propagation and the velocity factor. The inductive component has an additional component at the lower frequencies which slows the signal somewhat. This occurs around 100 KHz for small coax and lower for larger cables. For frequencies above 1 MHz, the dielectric constant of the cable is probably responsible for the decrease in the delay. Measuring the delay of cables can reveal some â€Å"hidden† properties that could make it unsuitable for some applications, such as carrying wideband data. (Audet, 2001) 3. 0 Possible solutionThe main component of a repeater is amplifier. There are many types of amplifier can be used for this job. RF amplifiers are electronic devices that accept a varying input signal and produce an output signal that varies in the same way as the input, but that has larger amplitude. RF amplifiers generate a completely new output signal based on the input, which may be voltage, current, or another type of signal. Usually, the input and output signals are of the same type; however, separate circuits are used. The input circuit applies varying resistance to an output circuit generated by the power supply, which smoothes the current to generate an even, uninterrupted signal.Depending on load of the output circuit, one or more RF pre-amplifiers may boost the signal and send the stronger output to a RF  power amplifier  (PA). Other types of RF amplifiers include low noise, pulse, bi-directional, multi-carrier, buffer, and limiting amplifiers. Detector log video amplifiers (DLVAs) are used to amplify or measure  signals with  a wide dynamic range and wide broadband. Successive detection log  video amplifiers (SDLVAs)  are log amplifiers that can operate over a wider dynamic range than DLVAs, while extended range detector log video amplifiers (ERDLVAs)  are  DLVAs that can operate with a wider operating frequency. (Global Spec, 2008) * Military / Defense * Mobile / Wireless  Systems * Plasma / Electron Laser * RF Induction Heating * Radar SystemsAmplifier Type: Applications: * Low Noise Amplifier * Power Amplifier * Bi-directional Amplifier * Multi-carrier Amplifier * Multiplier (RF amplifier, 2008) 3. 1 RF amplifier Selecting RF amplifiers requires an analysis of several performance specifications. Operating frequency is the frequency range for which RF amplifiers meet all guaranteed specifications. Design gain, the ratio of the output to the i nput power, is normally expressed in decibels (dB), or Gdb  = 10 * log (Po/Pi) Output power is  the signal power at the output of the amplifier under specified conditions such as temperature, load, voltage standing wave ratio (VSWR), and supply voltage.Gain flatness indicates the degree of the gain variation over its range of operating wavelengths. Secondary performance specifications to consider include noise figure (NF), input VSWR, output VSWR, and monolithic microwave integrated circuit (MMIC) technology. The noise figure, a measure of the amount of noise added to the signal during normal operation, is the ratio of the signal-to-noise ratio at the input of the component and the signal-to-noise ratio measured at the output. The NF value sets the lower limit of the dynamic range of the amplifier. Input VSWR and output VSWR are unit-less ratios ranging from  1 to infinity that express the amount of reflected energy. Global Spec, 2008) There are several physical and electrical specifications to consider when selecting RF amplifiers. Physical specifications include package type and connector type. Package types include  surface mount technology (SMT),  flat pack, and  through hole technology (THT). RF amplifiers may also be  connector zed  or use waveguide assemblies. Connector types include BNC, MCX, Mini UHF, MMCX, SMA, SMB, SMP, TNC, Type F, Type N, UHF, 1. 6 / 5. 6, and 7/16. Important electrical characteristics include nominal operating voltage and nominal impedance. Operating temperature is an important environmental parameter to consider. (Global Spec, 2008) 3. 1. 1 The Transistor AmplifierIn the preceding section explains the internal workings of the transistor and will introduce new terms, such as emitter, base, and collector. Here it discusses the overall operation of transistor amplifier. To understand the overall operation of the transistor amplifier, it must have to only consider the current in and out of the transistor and through the various components in the circuit. Therefore, from this point on, only the schematic symbol for the transistor will be used in the illustrations, and rather than thinking about majority and minority carriers that mean it will be only emitter, base and collector current. Before going into the basic transistor amplifier, there are two terms it should be familiar with: AMPLIFICATION and AMPLIFIER.Amplification is the process of increasing the strength of a SIGNAL. A signal is just a general term used to refer to any particular current, voltage, or power in a circuit. An amplifier is the  device  that provides amplification (the increase in current, voltage, or power of a signal) without appreciably altering the original signal. Transistors are frequently used as amplifiers. Some transistor circuits are CURRENT amplifiers, with a small load resistance; other circuits are designed for VOLTAGE amplification and have a high load resistance; others amplify POWER. By inserting one or more resistors in a circuit, different methods of biasing may be achieved and the emitter-base battery eliminated.In addition to eliminating the battery, some of these biasing methods compensate for slight variations in transistor characteristics and changes in transistor conduction resulting from temperature irregularities. Notice in figure 2-12 that the emitter-base battery has been eliminated and the bias resistor RB  has been inserted between the collector and the base. Resistor RB  provides the necessary forward bias for the emitter-base junction. Current flows in the emitter-base bias circuit from ground to the emitter, out the base lead, and through RB  to VCC. Since the current in the base circuit is very small (a few hundred microamperes) and the forward resistance of the transistor is low, only a few tenths of a volt of positive bias will be felt on the base of the transistor.However, this is enough voltage on the base, along with ground on the emitter and the large positive voltage on the collector, to properly bias the transistor. (Intregrated Publishing, 2002) Figure 14 The basic transistor amplifier With Q1 properly biased, direct current flows continuously, with or without an input signal, throughout the entire circuit. The direct current flowing through the circuit develops more than just base bias; it also develops the collector voltage (VC) as it flows through Q1 and RL. Notice the collector voltage on the output graph. Since it is present in the circuit without an input signal, the output signal starts at the VC  level and either increases or decreases.These dc voltages and currents that exist in the circuit before the application of a signal are known as quiescent voltages and currents (the quiescent state of the circuit). Resistor RL, the collector load resistor, is placed in the circuit to keep the full effect of the collector supply voltage off the collector. This permits the collector voltage (VC) to change with an input signal , which in turn allows the transistor to amplify voltage. Without RL  in the circuit, the voltage on the collector would always be equal to VCC. The coupling capacitor (CC) is another new addition to the transistor circuit. It is used to pass the ac input signal and block the dc voltage from the preceding circuit. This prevents dc in the circuitry on the left of the coupling capacitor from affecting the bias on Q1.The coupling capacitor also blocks the bias of Q1 from reaching the input signal source. The input to the amplifier is a sine wave that varies a few millivolts above and below zero. It is introduced into the circuit by the coupling capacitor and is applied between the base and emitter. As the input signal goes positive, the voltage across the emitter-base junction becomes more positive. This in effect increases forward bias, which causes base current to increase at the same rate as that of the input sine wave. Emitter and collector currents also increase but much more th an the base current. With an increase in collector current, more voltage is developed across R  L.Since the voltage across RL  and the voltage across Q1 (collector to emitter) must add up to VCC, an increase in voltage across RL  results in an equal decrease in voltage across Q1. Therefore, the output voltage from the amplifier, taken at the collector of Q1 with respect to the emitter, is a  negative  alternation of voltage that is  larger  than the input, but has the same sine wave characteristics. During the negative alternation of the input, the input signal opposes the forward bias. This action decreases base current, which results in a decrease in both emitter and collector currents. The decrease in current through RL  decreases its voltage drop and causes the voltage across the transistor to rise along with the output voltage.Therefore, the output for the negative alternation of the input is a  positive  alternation of voltage that is  larger  than the input but has the same sine wave characteristics. By examining both input and output signals for one complete alternation of the input, we can see that the output of the amplifier is an exact reproduction of the input except for the  reversal in polarity  and the  increased amplitude  (a few millivolts as compared to a few volts). The PNP version of this amplifier is shown in the upper part of the figure. The primary difference between the NPN and PNP amplifier is the polarity of the source voltage. With a negative VCC, the PNP base voltage is slightly negative with respect to ground, which provides the necessary forward bias condition between the emitter and base.When the PNP input signal goes positive, it opposes the forward bias of the transistor. This action cancels some of the negative voltage across the emitter-base junction, which reduces the current through the transistor. Therefore, the voltage across the load resistor decreases, and the voltage across the transisto r increases. Since VCC  is negative, the voltage on the collector (VC) goes in a negative direction (as shown on the output graph) toward -VCC  (for example, from -5 volts to -7 volts). Thus, the output is a negative alternation of voltage that varies at the same rate as the sine wave input, but it is opposite in polarity and has a much larger amplitude.During the negative alternation of the input signal, the transistor current increases because the input voltage aids the forward bias. Therefore, the voltage across RL  increases, and consequently, the voltage across the transistor decreases or goes in a positive direction (for example: from -5 volts to -3 volts). This action results in a positive output voltage, which has the same characteristics as the input except that it has been amplified and the polarity is reversed. (Intregrated Publishing, 2002) 3. 1. 2 Ultra High Frequency Transistor Array (HFA) The HFA3046, HFA3096, HFA3127 and the HFA3128 are Ultra High Frequency Tra nsistor Arrays that are fabricated from Intersil Corporation’s complementary bipolar UHF-1 process.Each array consists of five dielectrically isolated transistors on a common monolithic substrate. The NPN transistors exhibit a fT of 8GHz while the PNP transistors provide a fT of 5. 5GHz. Both types exhibit low noise (3. 5dB), making them ideal for high frequency amplifier and mixer applications. (HFA3127, 2003) The HFA3046 and HFA3127 are all NPN arrays while the HFA3128 has all PNP transistors. The HFA3096 is an NPN-PNP combination. Access is provided to each of the terminals for the individual transistors for maximum application flexibility. Monolithic construction of these transistor arrays provides close electrical and thermal matching of the five transistors. Features * NPN Transistor (fT) . . . . . . . . . . . . . . . . . . . . . . . . 8GHz * NPN Current Gain (hFE). . . . . . . . . . . . . . . . . . . . . . . . 130 * NPN Early Voltage (VA) . . . . . . . . . . . . . . . . . . . . . . . 50V * PNP Transistor (fT). . . . . . . . . . . . . . . . . . . . . . . . . 5. 5GHz * PNP Current Gain (hFE). . . . . . . . . . . . . . . . . . . . . . . . . 60 * PNP Early Voltage (VA) . . . . . . . . . . . . . . . . . . . . . . . .20V * Noise Figure (50? ) at 1. 0GHz . . . . . . . . . . . . . . . . . 3. 5dB * Collector to Collector Leakage . . . . . . . . . . . . . . . . . .30 dB) and this transistor amplifier gain was not enough for rebroadcasting signal, this project select another amplifier MAV-11SM from supervisor suggestion. One MAV-11SM amplifier gives around 10dB gain what has been shown in testing section. At last two MAV-11SM amplifiers and one HFA3127 has been used to get more than 30dB gain. It has been tested in network scalar analyzer. For field test, a TV card, three TV aerials have been used. The amplifier circuit has been connected with one aerial. It was working very well when it was directly connected with TV card. That it can be said that the repe ater was amplifying signal.But when another aerial with long transmission line was connected with amplifier and tried to rebroadcast the signal with 5v 1A power supply, TV picture quality was not improving expectedly. Digital repetition is an innovative concept, which helps to increase the DVB-T coverage while maintaining the highest quality and providing a greater flexibility. In spite of failure, this project was a high level platform to learn about signal and signalling. Future work: As this project is unsuccessful at that certain point, this project will try to solve the rebroadcasting problem. And the transistor array will be a great option to amplify signal if all five transistors are been used. From HFA3127, it is possible to get min of 120 dB gain if it is soldered perfectly. Works CitedAntenna basics. (2008, October 12). Retrieved May 5, 2011, from http://www. hdtvprimer. com/ANTENNAS/basics. html. Audet, J. (2001). Coaxial Cable Delay. Charan, L. (2002). Inter symbos Inter ferance (ISI) and Raised Cosine filters. Retrieved December 5, 2010, from http://www. complextoreal. com/chapters/isi. pdf. Datasheet. (2005, December 21). Retrieved February 20, 2011, from http://www. intersil. com/data/fn/fn3076. pdf. digital spy. (2009). Retrieved April 10, 2011, from http://www. digitalspy. co. uk/digitaltv/information/a12613/uhf-channel-and-frequency-guide. html. Global Spec. (2008). Retrieved April 10, 2011, from http://www. globalspec. om/learnmore/telecommunications_networking/rf_microwave_wireless_components/rf_amplifiers. HFA3127. (2003). Retrieved January 18, 2011, from http://www. intersil. com/products/deviceinfo. asp? pn=HFA3127. Intregrated Publishing. (n. d. ). Retrieved April 4, 2011, from http://www. tpub. com/neets/book7/25c. htm. Monolithic Amplifier. (2002). Retrieved January 14, 2011, from http://www. minicircuits. com/pdfs/MAV-11SM+. pdf. Pool, I. (2002). Digital Video Broadcasting. Retrieved April 13, 2011, from http://www. radio-electronics. com/info/broadcast/digital-video-broadcasting/what-is-dvb-tutorial. php. Power Amplifier design. (1998). RF transmitting transistor and power ampli? er fundamentals . RF amplifier. (2008).Retrieved April 10, 2011, from http://www. globalspec. com/learnmore/telecommunications_networking/rf_microwave_wireless_components/rf_amplifiers. sub-TV. (2006, October 13). Retrieved April 20, 2011, from http://www. sub-tv. co. uk/antennatheory. asp. Trolet, C. (2002). SPOT: filling gaps in DVB-T networks with digital repeaters. Presented by Gerard Faria, Scientific Director, Harris Broadcast Europe at BroadcastAsia2002 International Conference, Available at: http://www. broadcast. harris. com. Gantt chart APPENDICES Frequency Allocation for DVB-T in UK Band IV Channel| PAL-I Vision (MHz)| PAL-I Sound (MHz)| Centre (MHz)| 21| 471. 25| 477. 25| 474| 22| 479. 25| 485. 25| 482| 3| 487. 25| 493. 25| 490| 24| 495. 25| 501. 25| 498| 25| 503. 25| 509. 25| 506| 26| 511. 25| 517. 25| 514| 27| 519. 25| 52 5. 25| 522| 28| 527. 25| 533. 25| 530| 29| 535. 25| 541. 25| 538| 30| 543. 25| 549. 25| 546| 31| 551. 25| 557. 25| 554| 32| 559. 25| 565. 25| 562| 33| 567. 25| 573. 25| 570| 34| 575. 25| 581. 25| 578| 35| 583. 25| 589. 25| 586| 36| 591. 25| 597. 25| 594| 37| 599. 25| 605. 25| 602| 38| 607. 25| 613. 25| 610| Band V Channel| PAL-I Vision (MHz)| PAL-I Sound (MHz)| Centre (MHz)| 39| 615. 25| 621. 25| 618| 40| 623. 25| 629. 25| 626| 41| 631. 25| 637. 25| 634| 42| 639. 25| 645. 25| 642| 43| 647. 25| 653. 25| 650| 44| 655. 25| 661. 5| 658| 45| 663. 25| 669. 25| 666| 46| 671. 25| 677. 25| 674| 47| 679. 25| 685. 25| 682| 48| 687. 25| 693. 25| 690| 49| 695. 25| 701. 25| 698| 50| 703. 25| 709. 25| 706| 51| 711. 25| 717. 25| 714| 52| 719. 25| 725. 25| 722| 53| 727. 25| 733. 25| 730| 54| 735. 25| 741. 25| 738| 55| 743. 25| 749. 25| 746| 56| 751. 25| 757. 25| 754| 57| 759. 25| 765. 25| 762| 58| 767. 25| 773. 25| 770| 59| 775. 25| 781. 25| 778| 60| 783. 25| 789. 25| 786| 61| 791. 25| 797. 25| 794| 62| 799. 25| 805. 25| 802| 63| 807. 25| 813. 25| 810| 64| 815. 25| 821. 25| 818| 65| 823. 25| 829. 25| 826| 66| 831. 25| 837. 25| 834| 67| 839. 25| 845. 25| 842| 68| 847. 25| 853. 25| 850|