WK4 assignment Essay Example | Topics and Well Written Essays - 1000 words

WK4 assignment - Essay Example The article explores all of the above mentioned technologies in great detail wherein the author takes care to cover all the possible dangers that these high-end technologies may be attached to. The style of writing is argumentative wherein at first it seems that the writer is dead against the rise of scientific advancement beyond what it is today because of his foresight that , the very technology that humans invent may be the primary reasons for human extinction in the coming centuries; however, as one diligently reads through the entire work, it becomes relatively clear that the article also embraces a certain extent of muted optimism, wherein the writer balances out his arguments with greater trust and hope based on ethical principles. This article is not merely based on the personal thoughts and arguments of the writer alone, the entire context takes into account ideas, words and thoughts of other well known scientists and researchers related to scientific fields and presents a f ew excerpts from books written by eminent authors on similar context. The article is a well thought out piece where each and every argument that has been neatly presented holds great value. Bill Joy has reasons to fear the power that man is now creating and his strong pessimism against the developing technologies is not without base. He first discusses about the robotic technology. In his article he presents an excerpt (the New Luddite Challenge) from a book written by Theodore Kaczynski which surfaces the fact that humans will create machines to make their tasks easier and to completely enable them to work independently sans human supervision, the robots will be enabled with the power to think and make decisions. The idea being that you should be able to give the robot a goal, a mission, and the robot should be able to take actions based on the mission and whatever information becomes available (Gupta, 2010), and the results of these actions are believed to be better than those of humans. Joy fears that humans would ultimately become so dependent on these machines that the very existence of human form will become questionable without the life support of robots. The case may reach such an extreme that exterminating the machines would just mean suicide for the human race. Reading Han Morovec’s book Robot: Mere Machine to Transcendent Mind, Joy’s pessimism is enhanced because this book too believes in the fact that the human race would fade as a repercussion to vigorous competition among robotic industries. In fact even Darwin’s principle of survival holds true here. In the eyes of Bill Joy, the advancement in the field of genetic engineering is another major reason for his pessimistic attitude. The immense power that a genetic engineer beholds in manipulating microorganisms and using them to alter the DNA makeup of anything that catches his fancy may fall in the wrong hands. Good things in the wrong hands can never be good, because the powe r maybe exploited to only cause harm and his fears are not completely untrue because emerging bio-terror is a major concern today. â€Å"It will soon be possible to synthesize the genome for smallpox; preventing access to samples will then no longer be a protection† (Caplan & Magnus, 2002) and once again a bio-terror maybe initiated and the case maybe the same with all other diseases. His third and last pessimistic view is about nanotechnology, the science of manipulating atoms, the basic constituent of life which when used in a controlled manner could solve all major problems ailing humans ranging from curing diseases to low cost of technologies. But, obviously something this powerful can be used as a destructive weapon too.

International management 2 Term Paper Example | Topics and Well Written Essays - 4000 words

International management 2 - Term Paper Example TUI is the largest integrated tourism group in Europe, lagging far behind its competitors with a turnover of about â‚ ¬ 21,866 million and 70,200 employees in 2008. One of the unmatchable entrepreneurial landmarks of TUI is its continuous structural progress and upgrading services offered to worldwide customers. Contrary to its rivalry, TUI is very successful in both the tourism and shipping divisions because of its advanced attractive products and services as well as the expansion of new and strong brands. However, the performance of TUI has been affected badly due to ongoing war against terrorism, natural calamities, global recession and lack of customer confidence. Prior to 9/11, TUI had more dynamic growth from 1995 to 2001. Post 9/11 effects, really restricted the TUI’s expansion strategy especially in various countries of Asia. Since China is an emerging market, therefore TUI had planned a broad strategy but war in Afghanistan and its further effects in Pakistan, kept TUI to hold up its TUI China brand till 2006. In such political and military situations, ABC Tourism Company decided to launch its new branch in Greece instead of Asia. Before deciding about the Greece, ABC planned the following strategy. Greece is one of the leading tourism countries in Europe due to its quality of life, mild climate, low crime, comparatively low cost of living, competitive construction rates, and recreation facilities. TUI is the largest and No.1 Tourism Company in Europe and looking for to enhance its business horizon up to Greece which has been remained an attractive place for tourists throughout the history. Almost 16 million tourists visit this country each year. And it has a contribution of about 15% to the national GDP. Greece tourism industry is so stable and confident in its economic strength and potential that has spent huge money on its tourist attraction highlights like large scale

The Lack of Evolution in the Detective Genre Essay Example for Free

The Lack of Evolution in the Detective Genre Essay Sherlock Holmes is probably the most famous detective in literary history. Therefore, it is not surprising that many authors in the 20th century have followed Sir Arthur Conan Doyles template when writing detective stories. For example, Agatha Christies character Hercule Poirot is nearly identical to Holmes. In this essay, I will compare The Hound of the Baskervilles by Sir Arthur Conan Doyle and Hercule Poirots Christmas by Agatha Christie, two basically similar novels, which are clear examples of the detective genre. In doing so, I hope to prove that the basic elements of detective stories, such as the detective, his methods and the feeling of suspense, have remained unchanged over the years. Firstly, the most obvious point of comparison lies in the many similarities between the two main characters, the detectives, Holmes and Poirot. Both of them are quite vain and self-obsessed. Near the beginning, they are constantly taunting or bragging to their companions. For example, when Holmes proves that one of Watsons theories is incorrect, he says No mention of that local hunt, Watson with a mischievous smile, gently mocking him. Earlier on, he also says in noting your fallacies, I was occasionally guided towards the truth. Although this might be interpreted as a compliment, I believe that this is a very pretentious remark, which reflects Holmes vain and egotistical nature. Poirot on the other hand, does not taunt Colonel Johnson as Holmes taunts Watson. However, he does have a very high opinion of himself, and is just as arrogant as Holmes if not more so. When Colonel Johnson says that they ought to be safe enough (from murder cases) during your (Poirots) visit, Poirot begins to reply My reputation- before he is interrupted by Johnson mentioning Christmas time, peace, goodwill-and all that kind of thing. Poirot clearly believes that it is his reputation which will prevent any murders from being committed, when Johnson actually means that the goodwill of the people is what will prevent them. This is an interesting contrast in the depiction of the two detectives vanity. Doyle, through Watsons eyes, shows his idol, Holmes to be infallible, but shows Holmes vanity in his criticism of Watson. Christie on the other hand, shows Poirots vanity by creating a situation where he almost makes a fool of himself. Johnson however, does not respond to Poirots comment. Clearly, Christie does not want to openly humiliate Poirot.

An Investigation into the activity of A Amylase

An Investigation into the activity of A Amylase Alpha amylase is an enzyme. It specific binds with water and starch . It hydrolyses starch and glycogen to give glucose and maltose. It acts on the alpha bonds of polysaccharides. Because of the specificity of the enzymes activity the structure of the enzyme must be precise. Any factor which will cause denaturation of the enzyme will restrict its rate of activity. Two of the most important factors effecting Alpha amylase activity are temperature and pH. The following experiment is designed to investigate the effect of different environmental temperatures and pH on the activity rate of Barley amylase. Materials and Methods As per schedule, No procedures were changed from original schedule. Results: The results are recorded as the time when colour change indicated that all the starch had been hydrolysed. A dark blue-black colour signified the presence of starch. When this colour is lost and an amber-yellow colour develops indicating that all the starch is hydrolysed, the time is recorded. The results indicate that the activity of alpha amylase increases with decreasing acidity and is highest at pH7. The trend in effect of temperature on amylase activity is that it increases in the middle range but is inactive at extreme temperatures. The results do not agree with the expected results of previous similar experiments and repeats of the same experiment within the class do not concur with others Discussion The hypothesis being tested is that enzymatic reactions are effected by a number of external factors. Temperature and pH are thought to be the most important extrinsic factors. The objective was to examine the activity of the enzyme ÃŽÂ ±-amylase under the effect of increasing environmental temperatures and increasing pH levels and to determine the optimal temperature and pH for Alpha amylase activity. The starch medium selected was Barley. This is a good choice due to its ready availability, the ease of preparation and the body of work available on understanding its germination process due to its importance in the brewing industry. Barley is composed of 53% to 65% dry weight starch (Fox et al (2003), MacGregor 1978, Sanford et al 2003). Barley produces its own amylases during the germination period. The changes in the levels of ÃŽÂ ±- amylase detected in barley during germination are outlined by McGregor et al (1984). The breakdown of starch in barley involves two types of amylase ÃŽÂ ±-amylase and ÃŽÂ ²-amylase. The former works by hydrolysing the 1-4 bonds within the glucose chain exposing non-reducing ends for the beta amylase to split (fig 3.) (Keusch 2003). Prior to germination there is no amylase detected in Barley, a trace was found after 24 hours germination, but after that it was found to increase rapidly (MacGregor 1978). figure 3. www.uni-regensburg.de/Fakultaeten/nat_Fak_IV/Organische_Chemie/Didaktik/Keusch/Grafik/sucrose.gifimgrefurl The optimal temperature and pH for ÃŽÂ ±-amylase extracted from barley is well studied. Fox et al (2003) state an optimal temperature of 65Â °C and a pH of 5.5. ORourke (2002) gives optimal values of 67Â °C and pH 5.2 (table 3) while lower temperature values of 55Â °C for optimum activity of alpha amylase are given in other papers (Al-Bar 2009 and MacGregor 1978). The first two papers are written from an industrial and brewing viewpoint whereas the latter are written from a pure scientific evaluation of the characteristics of barley, this may have some bearing on the different temperatures cited keeping in mind that 60Â °C is the temperature used in mashing. The optimal temperature for amylase activity differs for different sources, Azuki beans , finger millet and wheat have optimum temperatures of 70Â °C, 45Â °C and 55Â °C respectively (Al-Bar 2009). In mammals the temp ph of the body fluids are kept constant at homeostatic condition. If the body temp ph varies from the optimum body temp ph, the enzymes activity decreases and the cellular respiration process which produces ATP energy cell mover would be affected in the body. Less ATP energy the body cells cannot perform the work which they need. The results of the present experiment did not comply with these expected results. From the literature the theory was that Amylase activity would increase with increasing temperature until a maximum level would be reached around 55Â °C and there after it would decrease as it was denatured at higher temperatures, ultimately showing no activity at 80Â °C. Likewise the effect of pH was anticipated to find increasing amylase activity with inc reased pH level to optimal between 5-6 and a decrease reaching neutral pH. While the average results were basically compliant there was a great variation in individual group results. Amylases are important across the spectrum of living organisms; they are required for the breakdown of carbohydrates, which is one of the four essential food groups and the main source of energy to living cells. Amylases are enzymes that increase the activity of a reaction without being consumed in the reaction. The reaction they are involved in is hydrolysis of carbohydrate which is the cleaving of bonds and the addition of water (Hogg 2005). Two main forms exist, alpha amylase and beta amylase, both hydrolyse carbohydrates but in different way. Alpha amylase is the faster acting as it can act on any part of the carbohydrate chain but beta amylase can only act on the non reducing ends which are produced in increasing amounts after the activity of alpha amylase. In plants amylases are largely involved in the germination of seed; temperature may be the trigger for onset of this process. In animals amylases are found in association with the digestive system, ptyalin in the mouth and fr om the pancreas. The amylase enzymes hydrolysis the disaccharides sugar and maltose into monosaccharides glucose galactose which are the smaller molecules of starch that are suitable for absorption in the small intestine for ultimate body use. As an enzyme it binds the substrates together, promotes the hydrolysis and frees the products (fig 4.), and if denatured at high temperatures this cannot happen Figure 4. http://kvhs.nbed.nb.ca/gallant/biology/biology.html From the results obtained and the discussion hitherto the indications are that the results of the present experiment are in error. The anticipated optimal temperature and pH based on previous experiments were Temperature 55Â °C and pH 5. The optimal results from the present experiment were 22Â °C and pH 6.4. This is a well practiced experiment with well recognised results. looking at the results where some conform to the expected and others have results that are un expected it is most likely that the deviation is due to human error, as in not mixing solutions correctly, not maintaining the test tubes at a constant temperature, mixing up samples and not monitoring the time of reaction correctly. The observation of colour changes is also highly subjective, the precise time of change being difficult to detect. Improvements could include using: a spectrophotometer to measure change of amount of starch remaining and then it must be blanked correctly before use. shaking equipment to ensure correct mixing using the same amylase as preparation by different groups might not have been adequate Concentration of substrate, exactness of measurement. Lack of closer attention by the operator can lead to error. Reaction rates, solutions and indicator need to be observed or calculated correctly to avoid errors. In conclusion, to improve on the experiment in future, proper attention and observation is very important.

Welfare Reform :: Social Welfare Retirement Economics Essays

Welfare Reform Welfare is a public assistance program that provides at least a minimum amount of economic security to people whose incomes are insufficient to maintain an adequate standard of living. These programs generally include such benefits as financial aid to individuals, subsidized medical care, and stamps that are used to purchase food. The modern U.S. welfare system dates back to the Great Depression of the 1930’s. During the worst parts of the Depression, about one-fourth of the labor force was without work. More than two-thirds of all households would have been considered poor by today's standards. With a majority of the capable adult population experiencing severe financial misfortune, many Americans turned to the government for answers. In response, U.S. President Franklin D. Roosevelt led a social and economic reform movement attacking the Depression. Part of his newly enacted â€Å"New Deal† program was the Social Security Act, enacted by Congress in 1935. This act and established a number of social welfare programs, each designed to provide support for different segments of the population. Recently Roosevelt’s Social Welfare Program has become a topic of heated debate. Welfare has come a long way since Roosevelt, it was once a system that help those in need until they could get back on their feet, now welfare has turned into a system that feeds money to a group of people that have become to lazy to find work. Talk of replacing the old system with a welfare program that will emphasize putting welfare recipients to work has become very frequent. More and more stated are now beginning to adopt a â€Å"welfare-to-work† program, leaving other states to simply ponder about the idea of â€Å"taking people off the system.† Those in favor of welfare reform argue that a welfare-to-work program will cut the amount of people on welfare causing a surplus of funds. These people base their idea on the overwhelming success of those states who have already adopted such a program. Nationwide, welfare caseloads have declined significantly since the passage of the Per sonal Responsibility and Work Opportunity Reconciliation Act of 1996. In the few months since the bill went into effect the amount of welfare caseloads are down by approximately 2 million. Figures also show that Alabama reduced its welfare enrollment by 48%, and Indiana, Oklahoma, South Carolina, and Tennessee reduced theirs by 49%. In Wisconsin welfare was reduced by 58% and Wyoming’s cases dropped an amazing 73% (Source: Dept.

A précis concerning Burleigh Wilkins, Can Terrorism Be Justified :: Terror Attack Septermber 11 Essays

A prà ©cis concerning Burleigh Wilkins, â€Å"Can Terrorism Be Justified† I. On September 11, 2001, I along with the rest of the nation, witnessed historical terror and devastation as the Twin Towers, a long-standing symbol of American prosperity, crumbled to the ground after two hijacked airplanes flew through them early that morning. Almost simultaneously in Washington D.C., a third airliner flew into the Pentagon, and shortly after, a fourth hijacked plane crashed in Somerset Country, PA. Few survivors emerged from the rubble; in the end, thousands were dead, and, without explanation or apology, millions of lives had been changed forever – all in a matter of minutes - a painful contrast to the far reaching affects that this sudden, single act had perpetuated. Over a month later we are only beginning to recover, further affirming the notion that will someday read like a line in a history book, that this was, is, and always will be one of the most horrible terrorist atrocities to ever plague our country. Terrorism has long been a global issue; for centuries it has gone on around the world. People with imperialist hopes for world domination often use acts of terrorism to scare smaller countries into support and subordination of the greater entity. Also, terrorism is often used to personify the hatred of one country for another. Burleigh Wilkins, who authored the piece, "Can Terrorism Be Justified?," raises the issue of whether acts of terrorism are ever morally justifiable, and utilizes situations where "a large number of people share guilt for a tragic situation," in what is known as collective guilt. According to Wilkins, terrorism is any act of violence against a group a people, whether they are the attackers or the victims of the attack. The answer to the title of the piece lies not in the definition of terrorism, but in the delineation of whether or not a terrorist act is justifiable. Wilkins uses this maxim: It is generally agreed that it is justifiable to do violence to another person in self-defense; some wars can be accommodated under the category of self-defense where this is construed in terms of a community of persons defending themselves against aggressors." Wilkins says that if we condemn unjust wars or unjust acts in wartime, then we also condemn terrorism where violence (or the imminent threat of

Power Theft Detection

1. INTRODUCTION The automatic meter reading(AMR) system as become a necessity for most suppliers as deregulation, free customer choice and open market competition occur in the energy supply sector. Power line communication has many new service possibilities on the data transferring via power lines without use extra cables. AMR is a very important application in these possibilities due to every user connected each other via modems using power lines. AMR is a technique to facilitate remote readings energy consumption.Improving the electrical power supply to households as a big issue. The government has set a specific goal to raise the distribution rate of electrical power supply, which is now around 70% to 80% to 100%. Power companies are plagued by power theft. PLC will play an important role in placing anti-theft power system. Illegal electricity may be a serious problem in many countries . This problem has been attempted to be resolved by special skills of humans, such as the police special security etc. These method could not give optimum solution due to their impracticalities. Similar essay: Essay About Snatch TheftMeter reading has been applied by humans and some electronics solutions such as optical reading methods, creditable utilization of electrical energy etc. Many chips which can be used for digital energy metering and PLC modems. The problem of illegal usage of electricity must be solved electronically, without any human control. 2. POWER THEFT Electrical power by altering, slowing, resetting, swapping, or disconnecting an electric meter. Theft also may occur by rewiring circuits to avoid an electric meter, or by tapping into another customer’s electrical lines.The fraudster might use devices to program the theft of power only during certain periods of theday or week. A fraudster may rewire their property to illegally use power from cheaper sources of power, or from meters that are billed at lower rates. The fraudster risks electrocution and detection. Field employees of the power company are trained to spot problems that result in persons n ot being billed for all the electricity they use. Computerized billing systems are designed to detect erratic electricity use Fig No 2. 1 3. PLC installATION.Power meters with PLC  modules will be installed near the top of the power polls. Previously, it was enough to install power meters in high places, not in low places such as the house wall, to prevent users from using power illegally by connecting cables, or by using tampered meters. However, by doing so, the homeowners themselves cannot check how much electricity was used. Therefore, PLC  technology was chosen. Meters installed in high places will send data of the used amount to each household through power lines. Homeowners can then check the amount used on the displays installed in each house.This means that the measurement function and the display function of the meters will be separated. [pic] Fig No3. 1 †¢Ã‚  Power theft is prevented by installing  HD-PLC-mounted power meters on a high position on power polls, while the amount of power used in each household can still be checked Each power meter is connected to an optical fiber network, and information of the amount used by each household is sent to the power companies. If the power companies find that a payment is delinquent, they can remotely stop the power supply by controlling the meters through the optical fiber network.In this way,  HD-PLC  and optical fiber networks enable power companies to prevent power theft, and to grasp the actual amount of power consumed by district or by each household in real time, and also to control the amount of power supply. The waste of power can also be reduced, another big advantage. Furthermore, wide spread use of the power meters with  HD-PLC  modules is expected to reduce regional disparities in information, or the ‘digital divide’. 4 . DETECTION OF ILLEGAL ELECTRICITY USAGE 4. 1 Methods Of Illegal Electricity Usage:In illegal usage, a subscriber illegally use electricity in f ollowing ways: 4. 1. 1 Using the mechanical objects: A subscriber can use some mechanical objects to prevent the revolution of a meter, so that disk speed is reduced and the recorded energy is also reduced. 4. 1. 2 Using a fixed magnet: A subscriber can use a fixed magnet to change the electromagnetic field of the current coils. As is well known , the recorded energy proportional to electromagnetic field. 4. 1. 3. Using the external phase before meter terminals: This method gives subscribers free energy without any record. . 1. 4. Switching the energy cables at the meter connector box: In this way ,the current does not pass through the current coil of the meter, so the meter does not record the energy consumption. Although all of the methods explained above may be valid for electromechanical meters, only the last two methods are valid for digital meters. 5. DESCRIPTION ON PLC Most economically viable technology for transferring Meter data to DCU. Uses the technique of communicating the data over existing Electrical Lines which carry LT power to the site.PLC is a kind of communication technology, which uses Medium Voltage(MV) and Low Voltage(LV) distribution network as the communication media to implement transmission of data, voice and real time image. The components involved in PLC are the; 1. Power Line Carrier Unit which provides signal transmission and reception. 2. There is a Coupler used for â€Å"clamping† around a live wire thus injecting the communication signals into the power line. 3. PLC modem 5. 1 The monitoring system mainly has the following functions: 1. Remote meter-reading 2. Data acquisition 3. Thread PLC transmissions are synchronized to the zero crossing point of the AC power line. It should be transmitted as close to the zero crossing point i. e. within 200 ? s. Square wave with a max Delay of 100 ? s from the zero crossing point The maximum delay between signal envelope input and 120KHz output bursts is 50 ? s. Therefore, it shoul d be arranged that outputs to the within 50 ? s. 5. 2 CODE TRANSMISSION: A Binary 1 is represented by a 1 ms burst of 120 KHz the zero crossing point and a Binary 0 by the absence of 120 KHz. Therefore only the 1 ms â€Å"envelope† need be applied to their inputs.These 1 millisecond bursts should actually be transmitted three times to coincide with the zero crossing points of all three phases in a three phase distribution system. 6. DIFFERENT COUPLING UNITS. [pic] 7. DEFINITION ON AMR AMR(AUTOMATIC REMOTE READING) automates the process of measurement through digital communication techniques. Bring â€Å"intelligence† into the revenue cycle and manage it: The revenue cycle includes metering, billing operating, customer and the services. 7. 1 ADVANTAGES: 1. Smart automated process instead of manual work. 2. Accurate information from the network load to optimise maintenance and investments . Customized rates and billing dates. 4. Streamlined high bill investigations. 5. D etection of tampering of Meters. 6. Accurate measurement of transmission losses. 7. Better network performance and cost efficiency. 8. Demand and distribution management. 9. More intelligence to business planning 10. Better company credibility. 8. DETECTION AND CONTROL SYSTEM The proposed control system for the detection of illegal electricity usage is: [pic] FIG. 8. 1 PLC signaling is only valid over the low voltage -220VAC power lines. The system should be applied to every low-voltage distribution network.The system given in fig 7. 1 belongs only one distribution transformer network and should be repeated for every distribution network. Although the proposed system can be used uniquely, it is better to use it with automatic meter reading system. If the AMR system will be used in any network, the host PLC unit and a PLC modem for every subscriber should be contained in this system. In fig7. 1 the host PLC unit and other PLC modems are named PLC1A,†¦. ,PLCNA and are used for AM R. These units provide communication with each other and send the recorded data in kilowatthour meters to the PLC unit.In order to detect illegal usage of electrical energy, a PLC modem and an energy meter chip for every subscriber are added to an existing AMR system. As given in fig1, PLC1B,†¦Ã¢â‚¬ ¦,PLCNB and energy meter chips belong to the detector. The detector PLC’s and energy meters must be placed at the connection point between distribution main lines and subscriber’s line. 8. 1 ADVANTAGE OF THIS SYSTEM : Most economically viable technology for transferring Meter data to DCU. Uses the technique of communicating the data over existing Electrical Lines which carry LT power to the site.Since the connection point is usually in the air or at underground, it is not suitable for anyone to access, such that its control is easy. It is very economical and is reliable solution when it is compared with the economical loss caused by illegal usage. 8. 2 CONDITIONS FOR T HIS DETECTION AND CONTROL: PLC signaling must be in CENELAC standards. CENELAC has formed the standard in which the frequency bands, signaling levels, and procedure are specified. 3-9 khz are restricted for use by electricity suppliers, and 95-148. 5khz are restricted to consumer use. The signal level for the band 95-148. khz is limited as follows. For general use ,the signaling level is limited to 116db µV. 9. DETECTION The recorded data in kilowatt hour meters for every subscriber are sent to host PLC modem via PLC modems which are placed in subscribers locations. On the other hand energy meter chips are located in connection point and read the enrgy in kilowatthours and also send the data to host PLC unit. This proposed detector system as two recorded energy data in host PLC unit, one which comes from the AMR-PLC, and the other which comes from the PLC at the connection points.These two recorded energy data are compared in the host PLC; if there is any difference between two re adings an error signal is generated. This means that there is an illegal electricity usage in the network. After that, the subscriber address and error signal are combined and sent to the central control unit. If it is, requested, a contacter may be included to the system at location to turn off the energy automatically, as in the case of illegal usage 10.. ILLEGAL DETECTOR SYSTEM FOR ONE SUBSCRIBER [pic] Fig No 10. 1 11.SYSTEM SIMULATION AND MODELLING OF THE DETECTION SYSTEM OF ILLEGAL ELECTRICITY USAGE FOR ELECTROMECHANICAL KILOWATTHOUR METERS [pic] Figure 11. 1 A host PLC modem, an energy meter chip and its PLC modem, an electromechanical kilowatthour meter and its PLC modem, and an optical reflector sensor system are loaded at the same phase of the power grid. The energy value at the electromechanical kilowatthour meter is converted to digital data using optical reflector sensor. Disk speed of the kilowatthour meter is couted and obtained data is sent to PLC modem as energy valu e of the kilowatthour meter.At the system model, an illegal load may be connected to the power line before the kilowatthour meter via an S switch. While only a legal load is in the system, two meters are accorded each other to compensate for any error readings. The host PLC unit reads two recorded data coming from metering PLC units. If the S switch is closed ,illegal load is connected to the system. , and therefore two recorded energy values are different from each other. The host PLC unit is generated when it received two different records from the same subscriber. This is the detection of the illegal usage for interested users.In these, the tests, the carrier frequency is selected at 132khz, which is permitted in the CENELAC frequency band. In real application, the AMR system may be designed in all CENELAC bands. The data rate between the host and the other PLC modem is 2400b/s. Data signaling between PLC modems has a protocol which includes a header, address, energy value data, error correction bits, and other serial communication bits such as parity and stop bits. The protocol may also be changed according to the properties of the required system and national power grid architecture.In the digital energy meter system, the recorded energy may be received in the digital form directly using the port of the meter. Therefore, there is no need for an optical reflector system in digital meters. 12. AN OVERVIEW OF THE PROPOSED DETECTOR SYSTEM The proposed detector system is the equipment and procedure for controlling more remote stations from a master control station. It includes PLC modems, energy meters, control logics, and the system software . 12. 1 PLC MODEMS: These used for two way communication to and from the host station and the remotely controlled targets. 12. 2 ENERGY METER AND CONTROL LOGIC:Energy meter includes metering chip, and some circuit element. control and logic units compare and generate the error signal in the illegal usage. 12. 3 SYTEM SOFT WARE: Assembler program for the microcontroller and the operating software for the management of the overall system. Operator software may be downloaded from a PC and should be placed in the main center of the system. 13. AN AMR SYSTEM FOR AN ILLEGAL DETECTOR PERFORMS THE FOLLOWING FUNCTONS: 1) 1Every user has two PLC modems; one is for AMR and the other is used to send the data from second energy meter chip to host PLC modem. ) An energy meter must be connected in the connection box between a home line and main power lines. 3) The host PLC unit must be placed in the distribution transformer and the configuration of the addressing format of PLC signaling must be designed carefully. 4. The host PLC modem and its controller must include two addresses per every user: one is the AMR and the other for the energy meter. These two addresses must be selected sequentially. 5. Operating software must designed for the information of every subscriber in every sub power network: subscriber ident ification number, billing address etc. . The system has two values of energy consumption for every user, so if there is a difference between them an error signal is generated for the illegal user. 7. The proposed equipment is the only one distributed in the power network. So this system should be repeated for all distribution power networks. All host units in each distribution transformer maybe connected only one main center station via phone lines, fibre optic cable or RF links. 14. CONCLUSION A detector system to determine illegal electricity usage via power line communication is designed and proposed.The proposed system is examined in laboratory conditions. Obtained results from this study show that if the AMR and detector system are used together, illegal usage of electricity may detected. The system functions with real-time monitoring users and burden forecast, which uses MV&LV PLC as its transmission media. The system is integrated with power management and burden control. Und er power theft, the relay is switched off isolating the area of power theft from the EB side . LCD display also indicates power theft. Energy regulation does not epresent an obstacle, since PLC service does not affect the power supply and maintains separate accounts from the core utility business. Once this proposed system is tried in real power lines, the distribution losses can be reduced effectively. 15. REFERENCE [1]Hakki Cavdar, †A solution to remote detection of illegal electricity usage via power line communication†, IEEE Trans. Power Delivery,vol. 19,no. 4,Oct 2004. [2] T. Y. Lim and T. W. Chan, â€Å"Experimenting remote kilowatt hour meter through low voltage power lines at dense housing areas†, IEEE Trans. Power Delivery, vol. 17, pp708-711,july 2002. [3] J.Newbury and W. Miller,† Multiprotocol routing for automatic remote using power line carrier systems†, IEEE Trans. Power delivery,vol. 16 pp 1-5,Jan 2001. ABSTARCT Power Line Communication (PLC) presents an interesting and economical solution for automatic meter reading (AMR). If an AMR system via PLC is set in a power delivery system, a detection system for illegal electricity usage may be easily added in the existing PLC network. In the detection system, the second digitally energy meter chip is used and the value of energy is stored. The recorded energy is compared with the value at the main kilowatt-hour meter.In the case of difference between two recorded energy data, in error signal is generated and transmitted via PLC network. The detector and control system is proposed. The architecture of the system and their critical components are given. This report describes a prototype of the detector system for illegal electricity usage using the power lines. ACKNOWLEDGEMENT I am thankful to Prof. Sukumaran P R ,Head of the Department for providing me with the facilities for the seminar. I would also express my sincere gratitude to Mrs. Rajashree Raghavan ,for her guida nce and mere cooperation for preparing and presenting the seminar.Above all I thank all the faculties of the EEE Department and my friends for their moral support and encouragement. CONTENTS 1. INTRODUCTION01 2. WHAT IS POWER THEFT? 02 3. How is PLC installed ? 03 4. DETECTION OF ILLEGAL ELECTRICITY USAGE04 5. DESCRIPTION ON PLC:05 6. DETECTION AND CONTROL SYSTEM07 7. ILLEGAL DETECTOR SYSTEM FOR ONE SUBSCRIBER:10 8. SYSTEM SIMULATION AND MODELLING OF THE DETECTION SYSTEM OF ILLEGAL ELECTRICITY USAGE FOR ELECTROMECHANICAL KILOWATTHOUR METERS11 9. AN OVERVIEW OF THE PROPOSED DETECTOR SYSTEM:13 10. CONCLUSION:15 11. REFERENCE16