Analysis of Power Density Levels

Analysis of Power Density Levels CHAPTER FOUR 3.5 EXPERIMENTAL DESIGN Figure 4.1: Setup during measurement          In this research work, the choice of instrument operation and parameters were established by quality assurance procedures. The following measurement parameters were investigated. These were: input attenuation, signal detection methods, resolution methods and measurement hold methods. The result of the quality assurance procedures are shown at the appendix. The study to measure and analyze power density levels was carried out with a total of 200 sites across the ten regions of Ghana as shown on table 4.1 below. The selection of the site for measurement was based on proportional sampling using mobile cell site population as well as the 2010 population census data. The measurement taken a location was always closer to a cell site than any other sources. The design of the measurement procedures was based on the Electronic Communication Committee (ECC) (ECC, 2007) protocol. A calibrated USA Anritsu Spectrum Master MS2720T with a serial number 1338067 and a frequency range of 9 KHz to 43 G Hz was connected to a calibrated hand-held Transformational Security (TS) Log-periodic antenna TS-6021 with a serial number 00302 and a range of 750 MHz to 3 GHz by an Anritsu RF cable with a serial number 39317A. A magnetic Global Position System (GPS) connected to the Spectrum Master takes the location coordinate during measurement as shown in figure 4.1 above Table 4.1: The distribution of 2010 population and sample sites (15 analogue terrestrial stations Region of Ghana Population (2010 census) Number of FM (June, 2015) Number of cell site Number of measurement site Sampling Date Greater Accra Ashanti Eastern Central Western Volta Brong Ahafo Northern Upper East Upper West 4,019,388 4,783,812 2,638,494 2,194,635 2,367247 2,120,659 2,317929 2,490541 1,035671 690,447 45 43 32 25 46 27 50 24 12 9 4041 2377 832 832 1189 594 832 713 238 238 68 40 14 14 20 10 14 12 4 4 September,2014 July,2014 June,2015 July,2015 September,2015 August,2014 November,2014 October,2014 October, 2014 October, 2014 . The sampling towns and location were pre-determined as plotted on the map in figure 4.2. These locations were mostly regional capitals and some surrounding towns and villages. Figure 4.2: GPS location showing places where radiofrequency measurements were made indicated by the tower symbols on the map The measurement at a spot involve taking measurement at three different heights: 1.0, 1.5 and 1.7 m above the ground. This is illustrated by the ECC raster below in the figure 4.3 below. Figure 4.3: Revised ECC recommendation (02)04 proposed raster   Measurements with the antenna was taken in two perpendicular plane at each height, with the axis of the antenna directed toward the reference cell site. A set of mutually perpendicular polarization measurements leads to the estimation of the maximum field arriving from a specific direction irrespective of its polarization. The measured field strength in dB µV/m from the spectrum data was corrected and converted to linear value using equation 4.1 and to V/m using equation 4.2. Figure 4.4 below shows a typical spectrum master measurement in the vertical plane that was taken at a town named Ahodwo in the Ashanti Region of Ghana. Figure 4.4: A typical spectrum master measurement taken at Ahodwo, a location in the Ashanti Region. Where   is the corrected electric field strength for cable and antenna loses taking polarization into consideration. was the antenna loss correction factor which is the ratio of the incident electric field to the received electric field.   is the measured electric field intensity without correction for cable and antenna and is the cable correction factor. The spatial average when dealing with the electric field strength for each specific frequency lying within the frequency range of interest, the maximum expected spatial average (RMS) across m selected spatial points was given by Where Emax, i is the maximum expected RMS field strength component at the spatial point i.The combined standard uncertainty u of the maximum expected field strength value calculated at the point i was estimated by taking into account the partial uncertainties of each components with a sensitivity coefficient is given by Hence U (  Ã‚  Ã‚  Ã‚  Ã‚   4.4 To be able to assess the level of compliance with the standard set by the international commission for non-ionizing radiation protection(ICNIRP) and in a multiple frequency environment, the calculated spatial averaged electric field strength from the results of equation (4.3) for each operating frequency was processed into power density assuming a far field measurement and using the relation below: The uncertainty for each frequency was propagated to the power density estimated by Where was the assumed free space impedance (377à ¢Ã¢â‚¬Å¾Ã‚ ¦.). The compliance was calculated by summing the ration of the calculated power density value to that of the reference level as given below. Where represent the various sources being considered, is the calculated power density from equation (4.7) and is the corresponding ICNIRP public reference power density values.      

Learning to be a Citizen of Cyberspace :: Technology Education Papers

Learning to be a Citizen of Cyberspace Most researchers agree that the growth of a knowledge-based society will bring about fundamental changes in the production, distribution and exchange of information and that most every social and cultural institution will be changed in some way, but none more than education (Negroponte, 1995; Oppenheimer, 1997; Stevenson, 1997; Upitis, 1997). This is because, more than any other social institution, education is fundamentally about knowledge, information, and communication. Although it certainly makes use of material tools and sometimes results in the production of material goods, these are ancillary to the fundamental process of education: people use knowledge to create more knowledgable people. It is therefore not surprising to find considerable support for transforming education so that it is as fully independent as possible from geographic location and physical space. If education does not require a specific spatial location or a building then it can be delivered from anywhere to anywhere. This will, some argue, transform the fundamental infrastructure of education at every level, starting particularly at the post-secondary level, and will fundamentally erode local community, or even national control over education. The development of on-line courses, libraries and other information resources, and the marketing of distant or on-line education by businesses and schools eager to profit from opportunities to expand their horizons, are the beginning of what some see as a revolution in learning. (Veccia, 1998; Wilson, 1997) In addition to overcoming geographical constraints on the delivery of education, new technologies promise to expand the basic nature of education. In quantitative terms, computer communication is opening up vast new sources of information and learning by enabling on-line access that frees schools from complete dependence on paper delivery. Associated with this is the ability to link written with audio and visual material that can enrich the full range of the learner’s senses. The technology also creates a qualitative expansion in the means of education by taking a process rooted in the one-way delivery of knowledge and making it more participatory and reciprocal. Education moves from an emphasis on transmitting information to the active creation of knowledge. Moreover, according to this view, computer communication takes a system of learning based in narrow linear, narrative forms, and opens it up to a wide range of non-linear, exploratory processes that allow the learner to m ake full use of his or her own multiple cognitive maps. As a result students mutually constitute their learning environments, all of which grow in the learning process.

Boeing 777 Finance Case Study Essay

Boeing is currently operating with the majority market share of the commercial sector of aircraft manufacturing. Frank Shrontz, our CEO, has recently stated his goal to increase the company’s return on equity from its current average of 12%. The following summary will delve into the most appealing project for the future of this firm: the 777 aircraft. The purpose of this new product is to maintain our competitive advantage in commercial airline production by completing a family of Boeing airplanes. The following net present value analysis will be used to determine the potential profitability of the 777 project. Our analysts concluded that a levered equity beta of 1.2939 was appropriate for the commercial division of Boeing. The levered equity beta was important to use due to its representation of the capital structure of Boeing and its value to the WACC calculation. This equity beta was calculated by removing the financial risk of four similar defense-oriented benchmark companies (over half of all revenues from their respective defense divisions). The Value Line betas of Lockheed, Northrop, Grumman, and McDonnell-Douglas were unlevered using the following formula U = (L) / (1+(1-t)(D/E)). The betas of these firms are important because by using the pure play approach, we can calculate an accurate equity beta for Boeing. Several adjustments must be made however, and those are discussed in the remainder of this paragraph. Once averaged, the Value Line betas equaled 0.4758. The next step required unlevering the total Boeing beta, which was found at 1.00. The formula used to unlever Boeing’s beta U = (1.00) / (1+(.66*.018)) = 0.9883. With the two betas we have calculated, Boeing’s unlevered commercial beta could be found. We found that the percentage of revenues derived from the defense division was 26%. The following formula provided the answer to Boeing’s commercial beta: U = (U-Boeing – (% defense)(U-Defense)) / (%commercial) = (0.9883 – (.26*.4758))/(.74) = 1.1683. After obtaining the unlevered commercial beta, our analysts then levered it by using the debt to equity ratio of 14%. The D/E ratio of 14% was chosen over the current 4% D/E ratio due to the additional financing needs in the future if the project were accepted. This yielded a levered equity commercial beta of 1.2939. The cost of equity of the project was then found using the equation: RE = rf + (market risk premium). Our team of analysts chose to use the long-term yield on treasury bonds in 1990 (8.82%) because it was similar to our investment horizon. The market risk premium is 5.4%. When these values are plugged into the previously stated SML equation, the cost of equity is (0.0882 + 1.2939*(.054)) = 15.81%. The return on equity for all-equity financing would be 15.13%. The only difference in the formula would be the use of the unlevered commercial beta 1.1683 instead of the levered commercial beta of 1.2939. This discrepancy between the two RE calculations makes sense because levering up increases the cost of equity. The weighted average cost of capital is then calculated with this equation: WACC = [RD * (1-t) * WD] + (RE * WE). The only new unknown is the cost of debt, which was 9.73%. The average yield to maturity of a AA-rated debt with 5 years to maturity is 9.73%–the cost of debt used in our analysts’ WACC calculation. Furthermore, a 34% tax rate and 14% weight of debt were used. WACC = [9.73% * 0.66 * 0.14] + (15.81% * 0.86) = 14.49% With all of the pieces of information our analysts gathered, the net present value (NPV) of all future cash flows could be found. Boeing has estimated the selling price of each 777 will be $130 million and includes adjustments for inflation over the time horizon of the project. After calculating the NPV over the 35-year project horizon, our analysts found it to be $1,736.34 million. Against our hurdle rate, the Boeing 777 project is very attractive. The key to this project being economically attractive is that the return outperforms inflation to provide real value to the firm. The sensitivity analysis provided reveals several gambles made by Boeing. They include the use of the highest estimated selling price per plane, units per year, rate of price increases, and market size among others. Even with all of the risks and estimations, Boeing should launch the 777 in October 1990 because the firm must not only stay competitive but keep their market share in the future. While the 777 project represents a huge risk with high levels of capital, it is a necessary risk since other firms are also completing their full product lines of airplanes. Also, the introduction of a derivative after 10 years and reduction in R&D costs could provide additional sales revenue and further affect the NPV of the project. While this project was certainly a gamble for Boeing in 1990, hindsight shows they made the right decision in creating the new 777. In October of 1990, right after the project was implemented, United Airlines placed a $28 billion order therefore â€Å"cementing the program Boeing was close to scrapping.† By March of 1994 they were already loaded down with 147 firm orders and 108 options with expectations of quickly increasing numbers. In June of 2008 it became evident that this aircraft had the differentiating ability to beat out its competitors. Headlines read â€Å"Boeing under intense pressure to increase production of top-selling fuel thrifty 777-300 ER†¦as airlines struggle with the soaring price of fuel.† In November of 2007 production of the 777 was sold out through 2012 and just 6 months later all remaining 2012 and 2013 slots were filled; the next available date for a new order was in 2014. Boeing officials stated they were â€Å"experiencing unprecedented demand† and were â€Å"producing at a rate of 7 [aircraft] monthly.† In November of 2011 the 777 became one of Boeing’s best-selling models, and on March 5, 2012 United Arab Emirates, the largest operator of the 777 with a fleet of 102, purchased Boeing’s 1000th 777, surpassing the numbers they forecast back in 1990.

The Feng Shui of Your Kitchens Architecture

The Feng Shui of Your Kitchen's Architecture Modern-day architects and believers in the ancient Eastern art, feng shui, agree: When it comes to home design, the kitchen is king. After all, its human nature to associate food and cooking with nurturing and sustenance.   Feng shui practitioners suggest that how you design and decorate the kitchen can influence your prosperity and health. Architects from the Western world may not talk about the ancient art of feng shui, but theyll intuitively figure out the energies of space. Chi, or Universal Energy in feng shui, is compatible with universal design and accessibility in architectural practice. Both share many of the same core beliefs, so lets look at some basic feng shui ideas and see how they apply to modern kitchen design. You Gotta Believe: The Disclaimer The first thing to bear in mind when considering any feng shui advice is that ultimately, feng shui is a complex practice with several different schools. Recommendations will vary from school to school and from one practitioner to another. So too, advice will differ depending upon the particular home - and the unique people living in it. Yet, despite their diverse views, feng shui practitioners will agree on basic principles for kitchen design. Placement: Wheres the Kitchen? When you first plan to build a new home, where should you put the kitchen? We can’t always decide where each room in a house or apartment will be in relation to the others, but if you’re working with new construction or doing extensive renovations, ideally the kitchen will be in the back of the house, at least behind the center line of the house. In any case, it’s better if you don’t see the kitchen immediately upon entering the house, as this can portend digestive, nutritional, and eating problems. Having the kitchen at the entry point can also mean that guests will come over and eat and then leave immediately. Such a placement can also encourage the inhabitants to eat all the time. But if your kitchen is in the front of the house, don’t panic.  Use this as an opportunity to get creative. One easy solution is to hang sheer or beaded curtains over the kitchen door. A more elegant way to redirect space ot to install louvered doors or a sheer sliding panel like an installed Japanese silk screen. The point is to command the direction of energy within the homes space. Provide something delightfully eye-catching across a hall or in a vestibule near the kitchen. That way, attention is diverted from the busy kitchen. Sliding Panel Doors Can Hide Kitchen Spaces. Ben Rahn/Construction Photography/Avalon/Getty Images (cropped) Kitchen Layout Its important for the cook to be in a commanding position when at the stove. The cook should be able to clearly see the doorway without turning away from the stove. This is also good accessibility practice, especially for the deaf. Renovating a kitchen to this configuration can be particularly challenging. Many modern kitchens place the range facing the wall. To resolve the problem, some feng shui consultants recommend hanging something reflective, such as a mirror or a shiny sheet of decorative aluminum, over the stove. The reflective surface can be any size, but the bigger it is, the more powerful the correction will be. For a more dramatic solution, consider installing a cooking island. Placing the stove in a central island allows the cook to see the entire room, including the doorway. Beyond the feng shui benefits, a cooking island is practical. The wider your view, the more you’ll be able to comfortably talk with dinner guests or keep an eye on the kids as you - or they - prepare the meal. Natural Lighting Enhanced by Task Lighting Flow Into Open Spaces. Mel Curtis/Getty Images (cropped) About Cooking Islands Cooking islands have become a popular trend in kitchen design. According to Guita Behbin, owner of Duramaid Industries (a kitchen and bath design and renovation company) many customers want their kitchens to flow into an open space, or Great Room, that includes a living and dining area. Designing a kitchen around a cooking island will help keep the cook involved in whatever is happening in that Great Room, whether it’s before-dinner conversation or hearing about a childs homework. Feng shui-inspired kitchen design dovetails with the contemporary trend toward group cooking. Instead of isolating the cook, families and guests often gather in the kitchen and participate in the meal preparation. Busy working couples use dinner preparation as an important time to unwind together. Cooking with kids becomes a way to teach responsibility and build self-esteem. The Triangle According to Sheffield feng shui course instructor Marelan Toole, good kitchen design is based on a traditional triangle model, with the sink, refrigerator and range making up each point of the triangle (view example). There should be a six-to-eight-foot distance between each appliance. This distance allows for maximum convenience and a minimum of repeated moves. Providing space between each of the major appliances will help you follow a core feng shui principle. Separate the fire elements - such as the stove and microwave - from water elements - such as the refrigerator, dishwasher, and sink. You may use wood to separate these elements, or you can use a plant or a painting of a plant to suggest a wooden divider. The feng shui element of fire is expressed with the triangular shape. In the kitchen, controlling fire is a good thing, whether youre an architect or a feng shui consultant. Sink, Refrigerator, and Range At Points of a Triangle. Adrianna Williams, Bill Diodato/Getty Images (cropped) Kitchen Lighting In any room, fluorescent lights do not promote good health. They constantly flicker, affecting the eyes and nervous system. Fluorescent lights can cause hypertension, eyestrain and headaches. However, they do serve a purpose, as they provide bright light at low cost. Light energy will influence your kitchens energy. If you decide that you do need fluorescent lights in your kitchen, use full-spectrum bulbs. Energy-efficient lighting and appliances are characteristics of both feng shui practices and green architecture. The Kitchen Stove Because the stove represents health and wealth, you want to use the burners on the stove top equally, rotating their use rather than habitually using a particular burner. Changing burners  represents getting money from multiple sources. Of course, the practice can also be seen as a practical step, similar to rotating the tires on a car. The old-fashioned stove, as opposed to a microwave, is often preferred because it is more in keeping with the feng shui belief that we should slow down, become more conscious of each activity, and do activities with intention. Heating a quick meal in the microwave is certainly convenient, but doing this may not lead to the most serene state of mind. Many feng shui practitioners are concerned with excess radiation and electromagnetic fields and would therefore prefer to avoid the microwave altogether. Obviously, each home and family will have to find their own balance between modern conveniences and optimal feng shui practice. Position the Stove To Enable Interactions. John Slater/Getty Images Clutter As with all rooms in the house, the kitchen should be kept neat and uncluttered. Clear your counters of everything. Store appliances in cabinets. Any broken appliances should be tossed out. Even if it means living without a toaster for a while, it’s better to have no toaster than one that doesn’t work very well. Also, remember to keep kitchen areas clean. Good Energy A Practical Design In some cases, building code regulations actually reflect good feng shui principles. Some codes make it illegal to place a window over the stove. Feng shui teaches us that windows should not be placed over stoves because heat represents prosperity, and you don’t want your prosperity flooding out the window. Luckily, feng sShui isn’t only about having a room with good chi, or energy. Feng shui is also a practical guide for design. For this reason, feng shui can be used with any style of room. The most popular styles often repeat as trends, according to kitchen design specialist Guita Behbin: the simple Shaker style seems to always be trending; a very contemporary look, with solid colors and wood grains is often popular; in some situations, a very opulent look makes a statement, with carvings, corbels, and cabinets on legs. Any of these styles can be successfully combined with the principles of feng shui to make for a kitchen that’s functional, up-to-date, and easy on the chi. It is truly amazing how much the ancient feng shui beliefs have to tell us about the design of modern kitchens. What type of lights should you install in your new kitchen? Where should you place the appliances? Architects and believers of this ancient Eastern art offer solutions, and their ideas are surprisingly similar. East or West, good design rules the day. Source Content adapted from an article by Nurit Schwarzbaum and Sarah Van Arsdale, courtesy of the online Sheffield School of Interior Design at www.sheffield.edu, now the New York Institute of Art and Design (NYIAD) at https://www.nyiad.edu/.

imperial Rome essays

imperial Rome essays During the Imperial Rome era, the lifestyles were quite different in which we in the present are very much used to. The civilization of the Roman Empire depended on the vitality of its cities. This meant that the society was based upon the strength that its cities contained. Almost all cities during this period were inhabited with a population of 20, 000. Only a select few had a populace of 75, 000 or more. The city of Rome in total had approximately 500, 000 residents. These figures compared with todays numbers seem incomparable but were large at the time. As people moved into Rome to start a living during the Imperial days, they were somewhat overwhelmed by its size, bustle, and noise. This was of the norm as most other cities that they fled were probably small subtle towns. With the continual expansion of people, there were two distinct classes of society, the rich and the poor. For the wealthy individuals or families, life was full of luxuries, along with comfortable living cond itions. The prosperous inhabited elegant homes, which were called domus. These dwellings included spacious areas, magnificent courtyards, several rooms designed for specific purposes (e.g. sleeping dinning) and a quaint and peaceful environment. With the space that these well-crafted monstrous homes occupied, most of Romes territory was built for the rich. This caused serious problems as only a small portion of the population inhabited these lodgings and colossal structures that were built such as theatres and forums, leaving a small amount of space for the mass of Romes population. Apartments, which were called insulaes or islands, were constructed to provide a less than livable home for the majority of people. They were usually five or six stories high to accommodate the most people possible, as every inch of space was considered a necessity. The most renowned insulae was the Insula of Febiala, which seemed to have towered above ...

People, Organisations and Leadership Essay Example | Topics and Well Written Essays - 1000 words

People, Organisations and Leadership - Essay Example These can be explained by looking at the reasons the employees who left the organisation gave for leaving and then analyzing them using popular human motivation theories. The following literature looks at the reasons which the employees gave for leaving and the analysis. Managers who left indicated he following factors as contributing to their need to leave; Isolation As for the junior line managers, one of the main reasons that they gave for leaving was that they felt isolated and that they were not being involved in policy development. Two things arise from this. One of them is the fact that the executive managers failed to involve and consult the junior managers in the development of policies. It is an essential practice to always involve everyone in the organisation in any policy and strategy development process. Failing to do that will only lead to the employees feeling that they were left out in the process and this can increase the possibility of resistance to the strategies d eveloped (Hubbard, Taylor, and Pocknee 1996). At the same time, failing to involve the employees in development of policy and strategy development will only mean that the employees will most likely not agree with the changes (Turner and Crawford 1998). There is no new policy that does not involve a shift of the way the firm is operated. People generally do not like change. People do not trust change processes because they are never sure of how the process will affect their lives and work (Helen 2005). In this regard, people are built to naturally refuse and resist change. This could be the reason why the changes introduced did not work. The other reissue with failing to involve the line managers in the process is that the managers may have felt overlooked. According to Maslow’s law, people’s needs change as their lives progress. In this example for instance, the needs of an employee are not like those of a line manager. A line manager, apart from having a good job and a good pay, would like to have job satisfaction (Cooper, Funnell, and Lee 2002). This job satisfaction comes from knowing that he is respected and recognised by the senior management (Bangs and Schaper 2003). When this recognition is denied him by the senior management when management fails to consult him or her, they may have a feeling that they have not been not respected, and that thus have reduced job satisfaction. At the same time, recognition by the senior management is more likely to offer the manager a way to grow and advance in the workplace. Lack of respect from the juniors The junior line managers who left also talked about the fact that they did not feel respected by the employees they were managing. This can be a particularly big source of job dissatisfaction regardless of how much the managers were earning. Money is not the only satisfaction source in a job because there are other very complex issues affecting satisfaction and motivation (Grenway 2008). This issue is p robably connected with the above issue of isolation. The lack of respect from the subordinates could be because they know that their managers do not have the full backing of the senior management. According to the policy developed, line managers were supposed to have a closer monitoring of the employees in order to increase production. This may have increase worker dissatisfaction because as Turner and Crawford 1998 say, people do not like to be monitored

International Human Resource Management Assignment - 1

International Human Resource Management - Assignment Example With internationalization of business, many experts feel that it will influence the HR practices of a company. The most common way in which business enters into global market are Joint Ventures (JVs), Multi domestic operations (MDOs) and strategic Alliance (SA). Such kind of businesses demands changes in organizational structures, communication across organisation, etc. To handle these issues the organisations need different HR approaches for managing such MNCs. Globalisation of business has affected HR managers more than any other functional heads (Davis, Kerr Von Glinow, 1987, pp. 486-495). Hence with increasing interlink of business across the nations, the HR managers need to give importance to International orientation of the employees. International human resource management is managing worldwide human resources like allocating appropriate resources to utilise their skills effectively. International Human resource management refers to the process of allocating, procuring and eff ectively utilizing the human resources of an international organisation. ... Hence new capabilities and knowledge are needed to be incorporated in the HR practices to make it work. Human resource incurs both cost and revenue to the company (Benson, 1978, pp. 21-37). Many international organisations are facing complications of dealing with many multicultural employees which are becoming an important contributor to their success. This need for human resource specialist is widely acknowledged not only for giant multinational enterprises but also for small enterprises. With economic liberalisation across Europe, reduction in the restriction on the labour movement across the European community, with the advent of new technology has all contributed to the importance of International HRM (Black, 1988, pp. 277-294). Companies now days are trying to invest outside their own country to gain competitive advantage. Due to such strategy they sometimes recruit the local staff or even third-country nationals, like individuals who are neither from home or parent country but from third country. Hence in this case it becomes important for the organisations to look at strategies managing these resources. The HR professional needs to have a deep knowledge of what will be the appropriate environment for such organisation to reach their objectives and goals. The problems faced by Sensortec Sensortec is a UK company set up in 2000 dealing mainly with development and manufacture of electronic sensors. They have their operations spread across three centres, one at Barking, the second at Stansted and another at Docklands. Each operating centre has different functions and hence their workforce supporting the operations is of different skill set. Sensortec is now facing increasing