Advertising and promotion Essay Example | Topics and Well Written Essays - 1500 words - 1

Advertising and promotion - Essay Example This "Advertising and promotion" essay outlines the changes that happened in these industries with the advent of the Internet and mass media development, changes in structures and etc. Marketing communication industry consists of client companies or the advertising party, the advertising agency and the media and other service or production agencies. The advertising agency plays the role of an intermediary, linking the advertisers with the media and other service providers. With the advent of the Integrated Marketing Communication (IMC) approach, more and more companies choose to appoint an advertising agency and coordinate and direct all marketing communications through the agency (Kotler & Amstrong, 2000). Production houses, other support service providers & media houses liais with the agency, who is appointed to represent the needs of the advertising client. Marketing communication industry consists of client companies or the advertising party, the advertising agency and the media and other service or production agencies. The advertising agency plays the role of an intermediary, linking the advertisers with the media and other service providers. With the advent of the Integrated Marketing Communication (IMC) approach, more and more companies choose to appoint an advertising agency and coordinate and direct all marketing communications through the agency (Kotler & Amstrong, 2000). Production houses, other support service providers & media houses liais with the agency, who is appointed to represent the needs of the advertising client.

Introduction to operations and supply chain management Case Study

Introduction to operations and supply chain management - Case Study Example s by having electronics products that would otherwise pose health risks in landfills, being taken back to the factory to leave the lands free for other economic activities (Partridge, 2010). Thirdly, the specific consumers usually benefit from better, more functional electronic products by replacing their outdated versions with new ones. Finally, by absorbing the waste plastics and circuit boards of dysfunctional products, Samsung is technically saving the relevant governments of resources which would otherwise be used to maintain an eco-friendly environment (Partridge, 2010). This implies the electronics manufacturer has technically eliminated the need for governments in charge of its markets to create awareness on the need for environmental conservation and or to set up waste recycling plants such as plastic incinerators. According to Partridge (2010), building sustainable supply chains differs from good business practices because the former is more comprehensive. Sustainable supply chains involves incorporating ecologically and financially worthwhile practices in the core of supply chain processes, from R&D stages, to raw material selection, to production, packaging, haulage, storage, delivery, consumption and disposal. In contrast, good business practices are rather secondary to the production and supply of products. Samsung would still have implemented the Take Back and Recycling programs in markets where there are limited regulations, as a way of capping costs of production and keeping in pace with rapidly evolving technologies in the electronics industry. As Partridge (2010) noted, technology and electronic products are normally affected the most by rapid development of more sophisticated gadgetry. Constant evolution of technologies would have pushed Samsung into adopting Take Back and Recycling program on the basis of keeping the cost of production and distribution considering that procuring new supplies is usually costlier. The same case applies to

Design Distance Measurer Based On Fpga Information Technology Essay

Design Distance Measurer Based On Fpga Information Technology Essay There are variety applications in range finder devices. Their main use is in areas where traditional measuring devices such as rulers, tape measures and other measuring devices are impropriate. Nowadays, the traditional measuring device can be replace by modern measuring device such as distance measurer based on laser. It has been implemented in short range distance even long range distance. The idea for using laser for range finding came when we can see that contractor had many problems in measuring the distance of the building especially from the floor to the ceiling. When it came to very high ceiling, such as in hall, stadium even close sport-court, the use of rulers or tape measures really a waste of time even need very hard work. This can be classified as uses in low tech world but in the high tech world, this distance measurer based on laser can be use with binocular in military use, especially for sniper. The observer can get the real distance of the enemy where the sniper can snipe from very far distance. This project is designed to be a laser distance measurer of detecting the distance of the object (wall) up to 10 meter away. The design based on simple physics, the distance travelled between two locations can be easily calculated if the speeds of travel are known. This device calculates the time is takes for a laser travel to, rebound off and return from a stationary object 1.2 Problem Statement Before this, we measure the distance using ruler or measuring tape, so this project design is to help human being by saving time and effort so we can measure the distance faster than before. With the help of Field Programmable Gate Arrays (FPGA) and the laser sensor, the design is more advance with the one click system and we can get the distance measurement by no time. In military use, the project will help by saving the life of the sniper as well. 1.3 Objective of the Project The objective of this project is to design distance measurer based on laser using FPGA as the microcontroller of the design. 1.4 Project Scope This project paper will involve in the analysis and design distance measurer based on laser, and FPGA as the microcontroller. These concepts are: The user will press the button as input. The laser will activate and laser beam will go direct to the object or surface. Laser beam will hit the object or surface and reflected it back. The sensor will picks up the signal. The flight time from the start and end will be measured. The corresponding distance of the reflecting object or surface is displayed in digital which is in 7 segment display. A few things that need to be considered for this design are: Types of laser sensors. How the instrumentation operates. Output characteristic. Many more issues need to be taken for consideration and this issue will be approached further in the coming chapters. 1.5 Project Plan Generally, this project is divided into five main chapters; namely Introduction, Literature Review, Methodology, Results and Discussion and Conclusion. CHAPTER 1 discusses on project overview, problem statement, the objective of the project, the scope in order to achieve the objective of the project and the thesis outline. CHAPTER 2 will focus on the literature review of the theory of laser based distance measurer and its development. There are also detailed introduction of the project and the background of various types of FPGA controller, i.e. VHDL, Verilog-HDL, Altera Quartus.. CHAPTER 3 describes about the methodology that will be used in order to complete this project which include the design of laser distance measurer using FPGA as the controller. This will include the selection of the technique use to measure the distance using the laser and the program to be compile with the FPGA board. Furthermore, it also discuss about how the program work on the hardware so that the project with give the result that I want. CHAPTER 4 discusses on the simulation results obtained. The detailed discussion is made to verify the performance and characteristics of the project. It will also discuss the problems and findings throughout the design and simulation of the system. CHAPTER 5 reviews the project outcomes upon the completion. Some suggestions are also made for better improvement in the future so that if anyone want to continue this project for better performance, they will know the basic of how this project start.. CHAPTER II LITERATURE REVIEW 2.1 Distance measurement Distance is a numerical description of how the objects are apart. In physics or everyday discussion, distance may refer to a physical length, or an estimate based on other criteria. In mathematics, a distance function or metric is a generalization of the concept of physical distance (Distance, 2010). In science, measurement is the process of estimating or determining the magnitude of a quantity like length or mass, compared with a measurement unit, like a meter or a kilogram (Measurement, 2010). The measure term can also be used to refer to a specific result obtained by the method of measurement Distance measurement is a process where we need distance measuring instrument which can measure the distance if the distance is short or long. The SI unit for each measurement is the meter (m) but there are many units of length such as feet, yard, inches etc, but they are not classified as SI unit of length. Remote sensing using the light sensor is widely used for implementing mobile robot. The main attraction of the distance light detecting means is its user friendliness of how to use it without need knowledge about it. The measurement precision is somewhat limited and care must be taken to ensure that the environment is not subject to temperature changes and the sensor should not be confused by stray reflections from material adjacent to the target. Even with these limitations, laser range finder has a wide application especially when the target is far away and the action required is low. But sometimes the laser must be reflected after the laser strike any target, which means that if the laser hit a transparent material, the calculation cannot be done. But the light system based on distance measurement are inherently more accurate than ultrasound techniques because of the narrow beam angles commonly used and the restrictions of freedom inevitably fundamentally mechanical acoustic signal generation and detection. These are wide ranges of techniques that can be used to measure distance using light. These vary greatly in cost and function of the laser distance measuring system is very expensive in cost compared to the system for measuring distance using ultrasonic. 2.2 Optical Distance Measurement 2.2.1 Introduction Wide variety of industrial, commercial and research use optical sensor for distance measurement. Most sensors use visible or infrared laser beam to project a light spot on a target, the surface on which distance should be measured, the distance from the place back in the light detecting portion of the probe is measuring several ways There are several factors to consider when specifying a laser distance sensor. They include maximum range, sensitivity, target reflectance and specularity, accuracy and resolution and sampling frequency. 2.2.2 Definition Some of the terms that related to optical sensing (e.g. laser or ultrasonic) and distance measurement that must be take notes as some knowledge before the measurement can be done. Some of the knowledge that must be take notes is defined and described briefly here (Glossary of Laser Sensor Terminology, 2010). Target: When a laser pointed at some surface, the light is reflected into the detector in an optical sensor. This can refer to a surface or material designed to reflect light, in which the sensor is pointed. To determine the maximum range of a sensor, reflectance target is the most important factor Cooperative Target: A target or any material designed by the manufacture to reflect the light to a sensor detector. It also provides the return signal to the receiver input higher after the laser beam and more. Cooperative target include glass cube, reflectors corner, retro reflective tape and other material made by several manufacturers. In some applications, the mirror can also be used as targets of cooperation. Figure 2.1: Cooperative Target (Module 6) Uncooperative Target: The material is not specifically designed to reflect light onto the sensor while taking the measurement. Can be generally referred to an object that scattering light. The term is used because the target in return cannot be reflected beam, this includes metal or painted surfaces, liquids and solids or loose granular Figure 2.2: Uncooperative Target (Module 6) Retro reflection: The reflection of light off a target object or surface back in the direction from which it came, for a wide range of angle of incident, either it came in 180 ° reflection or any degree as long it reflect to it sources. It can be said that the retro reflection will produce minimum scattering light. Retro reflection is achieved through multiple reflections within a retro reflector. Retro reflectors include corner cubes and retro reflective tape. A high quality corner cube retro reflector will return virtually all the light entering it to its source. Corner cubes may be used to extend range hundreds or thousands of times over ordinary surfaces. A corner cube array was left on the moon to allow accurate measurement of its distance from the earth. Some of the example item that commonly being used in many applications is retro reflective tape. It typically consists of microspheres or cubes of glass or plastic which act like many tiny retro reflectors. Figure 2.3: Retro reflection Surface (Retroreflector, 2010) Diffuse Reflection: This terms is being use when a light strikes the target and scattered over a wide angle which mean the incident ray reflected in many angles.. Plain white paper of flat (not glossy) wall paint is good diffuse materials. It can be classified as the best uncooperative targets, and may be measured to over a wide range of incident angles (up to 80 degrees for some materials). Untitled.jpg Figure 2.4: Diffuse Reflection Surface (Diffuse Reflection, 2010) Specular Reflection: It occurs when the light strikes a shiny or mirror-like surface and is reflected away in one angle which is same to the angle it reflects. Glass, liquid surfaces and polished metal are specula and generally it needs a sensor configured specifically for specula surfaces. This behaviour is described in the law of reflection where it totally follows the law itself. Figure 2.5: Specular Reflection Surface (Specular Reflection, 2010) Reflectance: The amount of light reflected from the target, expressed as a percentage of incidents light. Diffuse reflectance refers to the amount of light scattered in all directions by a diffuse target. Specular reflectance refers to the amount of reflected light is reflected for example a mirror. Reflectance depends on the target color and composition and the frequency of light is reflected. Diffuse surfaces often vary from 3% to 95% reflectance. Many surfaces such as pain and glossy coated paper are diffuse and specular components of reflection Maximum Range: The maximum distance of sensors that picks up the reflected light and to obtain an accurate measurement of the distance. The maximum range may be limited by laser power, the amount of light reflected from the target and the sensitivity of the detector. It may also be limited by the measurement method used and the distance that the sensor is accurately calibrated Laser Power: It is the optical power level emitted by the laser sensor. The power can be specified as average power or peak power and average, if the sensor output pulses of intermittent light. If all other factors being equal, the maximum range increases in proportion to the square root of laser power, if power is multiplied by four, it will double the maximum range it can achieved. Laser power is expressed in Watts Mill (mW) or watts (W). Sample Rate: The frequency of a sensor updates its output range. The sampling frequency capability of remote sensors varies widely, depending on the measurement method that being used and the design of the devices. The sampling frequency can be as low as one sample every few seconds and run a million samples per second.. Response Time: It is the delay between the time changes in target position and the time changes of the sensor output. This may be more than one sample interval, if the sensor is processing or calibration of the intermediate samples during transmission of the previous sample and then taking the next measurement. Sensitivity: A measure of the ability to obtain a reading on a dark target or with low laser power. Sensitivity decreases at long ranges. Depth of Field: The span of distance over which a measurement sensor can measure distances accurately. This may be limited by the approach of light focus collection and the maximum distance that reflect enough light to the sensor. These two factors will determine how changes in the sensitivity of the sensor with distance. 2.2.3 Performance Of Optical Sensor On Specula And Diffuse Targets All sensors require a bit of laser light to the back surface of the target to operate. The amount of light needed is a measure of the sensitivity of the device. In general, the most sensitive devices are more expensive and accurate measurement of high sampling frequency requires more thought than for lower sampling frequencies. For diffuse targets, the higher the reflectance of the target, the best performance of a sensor will be. Lightweight materials such as wood, paper or white paint is non-cooperative targets that work well at all distances. The 50 darkest carbonaceous materials feet from a rangefinder can return only one ten-millionth of the light that reaches them at a rangefinder. The maximum range and depth of field can be limited to as little as 1.5 of what is possible with ordinary, light-colours surfaces. In addition to the amount of light a surface reflects the way light is reflected can affect the performance of an optical sensor. Many surfaces are partly specula and partially diffuse. These can be difficult to measure the amount of light reflected to a sensor may vary considerably with the angle of the target surface. 2.2.4 Accuracy, Repeatability and Resolution The accuracy of a sensor is a measure of the difference can be provided between the reading of a sensor and the actual distance measured. The resolution is the smallest change in measured distance. The resolution is the smallest change in the distance a sensor can detect and is usually a value smaller than the precision error. Accuracy can be affected by reflection from the target temperature, ambient light, which will generally not affect the resolution. Repeatability is the measure of the stability of the sensor over time. Generally, the sample repeatability sample will be lower for very fast sampling rates, because less time is used for measuring average. As the sampling frequency is lowered, the repeatability will improve, but this cannot continue indefinitely. Beyond some deceleration rate of the sample, the repeatability will start to get worse as the long-term drift in the components and changes in temperature cause changes in output of the sensor. 2.2.5 Spot Size and Divergence Other specifications which may be important are the laser spot size and divergence of the beam. Some applications require a small spot for high-resolution, measurement while others require a larger diameter spot of averaging rough surfaces or for eye safety concerns. 2.2.6 Visible and Infrared Lasers Both visible and infrared (IR) laser are used in distance measurement. For some applications, the advantage of being able to see the spot is an advantage, while others do not want the place to be seen. For some sensors, they have two versions of visible and infrared. IR versions are slightly more sensitive and more accurate than the version visible and IR models have a wider range of laser powers. 2.2.7 Class of Lasers 2.2.7,1 Class I It has no possibility damaging the eye. That is because of a low power of the output (in which eye damage case is impossible, even after the hours of exposure), or because of an enclosure preventing the access of the users to the laser beam during normal operation, any individual, independently of the conditions of exposure to the eyes or the skin, No one can expect to be wounded by a laser of class I. No requirements of safety are necessary to use with the devices of laser class. The lasers of class I are apparatuses with low power which are regarded as sure of all the potential dangers. Some examples of the use of the laser of class I are as follows: the printers laser, CD-ROM devices, the geological equipment of survey and the laboratory equipment of analysis (Laser Safety, 2010). Figure 2.6: Example of Class I Application Laser Printer (Application of Laser Product, 2008) 2,2,7,2 Class II Class II laser can damage the eyes of the person if deliberately looks in the beam for one prolonged period (i.e > 15 minutes). Power of output can be up to 1 mW. This category includes the lasers that emitting a visible light. Certain pointers lasers are in this category. The lasers of class II are of low power which is less than 1mW, lasers of the visible light which could cause damage with the eyes of a person. Some examples of laser use of class II are: demonstrations in class, the pointers laser, devices of aiming and the distance measuring equipment. Avoid looking in a laser beam of class II or pointing a laser beam of class II in the eyes of another person. Avoid looking at class II of the beams laser with telescopic devices. To carry out that the light of a laser beam of class II in the eyes causes a normal reaction to divert the glance or to close the eyes (Laser Safety Policy, 2010). Figure 2.7: Example of Class II Application Barcode Scanner (Application of Laser Product, 2008) 2.2.7.3 Class IIa Laser class where it is in the low-power output of Class II ans the laser requires in excess of 1000 seconds of continuous viewing to produce a burn to the retina. Commercial laser scanners are in this subclass (Laser Safety, 2010). Figure 2.8: Example of Class IIa Application Laser Disco Light (Starfield Projector, 2007) 2.2.7.4 Class IIIa The lasers of class IIIa are from continuous wave. The lasers in this class are most of the time dangerous in combination with the optical instruments which change the density of diameter or power of beam. The power of the output is not exceeding 5 MW. The density of power of beam cannot exceed 2.5 mW/square centimetres. Many sights of laser for weapons with fire and indicators of laser are in this category of devices with intermediate output power (1-5 mW). Some examples of the uses of laser of class IIIa are identical to that laser of class II with the most popular uses being indicators of laser and modules of laser scanner. The direct viewing of the laser beam of IIIa of class could be dangerous with the eyes. Directly do not look at the laser beam of IIIa of class (Laser Safety, 2010) . Figure 2.9: Example of Class IIIa Application Military Equipment (Marushin M16A1) 2.2.7.5 Class IIIb The lasers in this class can damage if the beam enters the eye directly. This generally applies to the lasers actuated starting from 5-500 mW. The lasers in this category can damage permanent eye with exposures of 1/100th one second or less according to the force of the laser and the lasers at the end of high power of this class can also present a fire hazard and can slightly burn the skin. A diffuse reflection is generally not dangerous but the specular reflections can be like dangerous that is direct exposures. All times that occupying a control field of laser, carry the suitable protection of eye. Protective Eyewear is recommended when the direct viewing of beam of the lasers of IIIb of class can occur. Some examples of the uses of laser of IIIb of class are spectrometry, stereo lithography, and the light of entertainment shows (Laser Safety Policy, 2010). Figure 2.10: Example of Class IIIb Application Military Equipment (Azari, 1998-2009) 2.2.7.6 Class IV The lasers of class which is the majority of entertainment, industrialists, scientists, military and medical are in this category. Some examples of use of laser of class IV are surgery, research, drilling, cutting, welding, and the lasers micromachining in this class produced powers moreover than >500mW or pulsed of >10 J/cm2 in the beam and can damage considerably and permanent the eye or the skin without being magnify by optical system of eye or instrumentation. It can be dangerous to peel or observe diffuse reflexions of the laser beam in the nominal zone of risk. The lasers of class IV are devices of high power. The direct beam and the diffuse reflections of the lasers of class IV are dangerous with the eyes and the skin. The devices of laser of class IV can also be a fire hazard according to the reaction of the target once struck. Orders much larger are required to ensure the sure exploitation of this class of the devices of laser. All times that occupying a control field of las er, carry the suitable protection of eye. The majority of the damage of eye of laser occur reflected beams of the light of laser of class IV, thus maintain all materials reflective left the beam. Do not place your hand or any other part of body in the laser beam of class IV (Laser Safety, 2010). Figure 2.11: Example of Class IV Application Laboratory Equipment (Oxford, 2009) 2.2.8 Method of Measuring Distance Based On Laser Lasers can be used in various ways to measure distances or travel without physical contact. Laser length measurements allow the most sensitive and accurate records for extremely rapid and larger measurement ranges, even if these qualities are usually not combined with a single technique. According to specific requests, very different technical approaches may be appropriate. Some laser applications such as in architecture, inspection of manufacturing facilities, crime scene investigation (CSI), and the army (Paschotta D. R., 2010). 2.2.8.1 Triangular Measurement Method It exploits the ability of a laser beam to propagate in a well-collimated form (ie with small divergence) over long distances. In a typical case, the laser beam illuminates a point and the laser is essentially used as a pointer. Diffuse or specular reflections of this item are followed by a detector that is mounted in a distance from the laser beam, so that the laser source, object and detector form a triangle. The principal is same like the ship trying to find the distance from the shore (Encyclopedia of Laser Physics and Technology, 2010). Figure 2.12: Triangulation Method (B., C., D., 2010) The high detection rate, it is possible to control the position of a moving or vibrating example: part of some machines. The precision obtained is very accurate compared with other devices. For diffuse reflections, the distance may be limited by the obligation to receive a sufficient amount of reflected optical power, with specular reflection, a greater distance can be measured, but a sort of angular alignment is required (Paschotta D. R., 2010). 2.2.8.2 Time-Of-Flight Measurement Method Time of flight measurements are often used to measure a distance, used for example in an airplane, possibly in the form of laser scanning radar. Here, a device sends an optical pulse and measure short time until a reflected portion of the pulse is controlled. The distance is then calculated using the speed of light. This method usually used for measuring distance, like hundreds of meters or several miles. By using advanced techniques (involving high-quality telescopes, very sensitive photo detector, etc..) With the precision of a few centimeters, it is possible to measure e.g. the distance between Earths and to obtain an accurate profile of a dam. Over time, measures are preferably used in flight for long distances, the beam quality of laser source is crucial. For large distances, high pulse energies are required. This may raise issues of laser safety, especially if the laser wavelength is not in the eye safe region. For nanojoule to microjoule pulse energies (as required for medium distances), it is possible to use a chip laser passive Q-switched Er: Yb glass, which can generate pulses rather short (the duration of the order of 1 ns) with pulse energies of Yb: about 10 ÃŽÂ ¼J in the spectral region to eye safety (Paschotta D. R., 2010). 2.2.8.3 Phase Shift Measurement Method The method of phase shift usually use in laser rangefinders, a technique for measuring distances in the following manner. A laser beam with sinusoidally modulated optical power is sent to a target. Some reflected light (diffuse sources or specular reflections) is monitored, and phase modulation power is compared to the light sent. The phase shift obtained is 2à Ã¢â€š ¬ times the time of flight time frequency modulation. This shows that higher modulation frequencies can result in better spatial resolution. Although the phase shift is directly proportional to the duration of the flight, the length of time of flight method should be reserved for cases where one really measures a delay time more directly. Figure 2.13: Phase Shift Method (Dixon Henlich, 1997) With regard to an interferometer, the phase shift method has an ambiguity in the distance, because with the distance from the phase varies periodically. However, the frequency is much greater than in an interferometer, since the frequency modulation is much smaller than the optical frequency. In addition, ambiguity can be easily removed, for example, by measuring with two different modulation frequencies. 2.3 FPGA Field-programmable gate arrays (FPGA) are ICs that contain an array of identical logic blocks with programmable interconnections. It also can be classified as one of the programmable logic device (PLD). There are also some other type of PLD which is Simple Programmable Logic Device (SPLD) and Complex Programmable Logic Device (CPLD). The user can program the function realized by each logic block and the connections between the blocks. FPGAs have revolutionized the way prototyping and designing are done. The flexibility offered by reprogrammable FPGAs has enhanced the design process. There are a variety of FPGA products available in market now. Xilinx, Altera, Lattice Semiconductor, Actel, Cypress, Quick Logic and Atmel are examples of companies that design and sell FPGAs. 2.3.1 DE2 Board Figure 2.14: DE2 Board Model EP2C35F672C6 (DE2 Development and Education User Manual) The following hardware is provided on the DE2 board: Altera Cyclone ® II 2C35 FPGA device Altera Serial Configuration device EPCS16 USB Blaster (on board) for programming and user API control; both JTAG and Active Serial (AS) programming modes are supported 512-Kbyte SRAM 8-Mbyte SDRAM 4-Mbyte Flash memory (1 MByte on some boards) SD Card socket 4 pushbutton switches 8 toggle switches 18 red user LEDs 9 green user LEDs 50-MHz oscillator and 27-MHz oscillator for clock sources 24-bit CD-quality audio CODEC with line-in, line-out, and microphone-in jacks VGA DAC (10-bit high-speed triple DACs) with VGA-out connector TV Decoder (NTSC/PAL) and TV-in connector 10/100 Ethernet Controller with a connector USB Host/Slave Controller with USB type A and type B connectors RS-232 transceiver and 9-pin connector PS/2 mouse/keyboard connector IrDA transceiver Two 40-pin Expansion Headers with diode protection 2.3.2 Block Diagram of the DE2 Board Figure 2.15: Block Diagram of DE2 Board Model EP2C35F672C6 (DE2 Development and Education User Manual) 2.3.3 Cyclone II Altera Cyclone II FPGA density range has 68,416 logic elements (GE) and provide up to 622 usable I / O pins and up to 1.1 Mbits of embedded memory. Cyclone II FPGAs are manufactured on 300mm wafers. The low cost and optimized feature set of Cyclone II FPGAs make ideal solutions for a wide range of automotive, consumer, communications, video processing, test and measurement, and other end-market solutions. Devices that support the Fast-On feature are designated with an A in the code of the controller. The EP2C5A is only available in the class of vehicle speed. The EP2C8A and EP2C20A are only available in the category of industrial speed. The EP2C15A is only available with the Fast-On feature and is available in both commercial and industrial categories. Figure 2.16: DE2 Board Model EP2C35F672C6 (DE2 Development and Education User Manual) 2.3.4 Evolution of Programmable Logic An FPGAs has grown in the past twenty years since the introduction. In the early 1970s, Programmable Logic Devices (PLDs) had been on the market. These devices used two-level logic structures which are AND plane as the first level of logic which generally fixed while the second level known as OR plane which is programmable. Figure 2.17: Some Example Of PLD Basic Circuit (David, 2006) 2.3.5 FPGA Types Configuration Technology Technology Overview And Features SRAM Based An external device program the device on power up. It allows fast reconfiguration. Configuration is volatile. Device can be reconfigured in circuit. Anti-Fuse Based Configuration is set by burning internal fuses to implements the desired functionality. Configuration is non volatile and cannot be changed. EPROM based Configuration is similar to EPROM devices. Configuration is non-volatile. Device must be configured out of the circuit. EEPROM based Configuration is similar to EEPROM devices. Configuration is non-volatile. Device must be configured out of the circuit. 2.3.6 Advantages of FPGAs However they have compensating advantages, largely due to the fact that they are standard parts. FPGA has larger capacity, more architecture and more register than other PLD. It is because the FPGA is the evolution of the PLD before it. There is no wait from completing the design to obtaining a working chip. The design can be programmed into the FPGA and tested immediately. FPGAs are excellent prototyping vehicles. When the FPGA is used in the final design, the jump from prototype to product is much smaller and easier to negotiate. The same FPGA can be used in several different designs, reducing inventory costs. 2.3.7 Disadvantages of FPGAs FPGAs are not custom parts, so they arent good at any particular function as dedicated chip designed for that application. FPGAs are generally slower and burn more power than custom logic. FPGAs are also relatively expensive. 2.3.8Types of FPGA Reprogrammable (SRAM-based) Xilinx, Altera

The job of a Sociologist :: essays research papers

  Ã‚  Ã‚  Ã‚  Ã‚  Sociologist study a variety of topics in basic settings as well as in applied settings. To do so, the sociologist must work within three different realms. These realms are the theoretical realm, the observational realm, and the policy/action realm.   Ã‚  Ã‚  Ã‚  Ã‚  To begin research sociologist must look into the theoretical realm. Here (s)he may observe existing social knowledge about human behavior. After the sociologist focuses on one of these existing studies they may move on to the observational realm. If the sociologist is in a basic setting (s)he would now re-hypothesize about the fact she found and test it. However, if the sociologist is in an applied setting, (s)he must do much more work. Applied research includes such things as program evaluations, social impact evaluations, social indicators, and cost benefit analysis.   Ã‚  Ã‚  Ã‚  Ã‚  After the sociologist has begun the research (s)he will now move onto a different realm. Basic research will finish in the policy/action realm by creating a policy or recommendation based on their research. However, those in an applied setting have many options to consider. The sociologist may send their analysis outside of all these realms to a consultant or clinician. Here these people can make a clinical recommendation on what to do about their finding. They may also announce a program implementation. Other directions which the sociologist in the applied setting may go are in the Policy action realm to give their own policy recommendation. They may also announce program implementation without consulting a clinician.   Ã‚  Ã‚  Ã‚  Ã‚  One practitioner who has followed these steps is Herbert Spencer. Spencer looked at society based on another’s theory. He looked towards Charles Darwin’s theory of evolution. With this idea in mind, he came to his own hypothesis that society also has evolved over time. He also looked at society from a biological standpoint. He stated that â€Å"society is a set of interdependent parts that work together to maintain the system overtime.†   Ã‚  Ã‚  Ã‚  Ã‚  Spencer believed that the best aspects of society would survive throughout time. He believed that it is nobody’s place to try to correct any bad aspects of society. Instead society should be left alone to run itself so that it can see that only the best societies will survive.

Ib Chemistry – Energetics (Hl)

6. 1. 1 If the reaction produces heat (increases the temperature of the surroundings) then it’s exothermic. If it decreases the temp (i. e. absorbs heat) then it’s endothermic. Also, the yield of an equilibrium reaction which is exothermic will be increased if it occurs at low temps, and so for endothermic reactions at high temperatures. 6. 1. 2 Exothermic : A reaction which produces heat. Endothermic : A reaction which absorbs heat. Enthalpy of reaction : The change in internal energy (H) through a reaction is ? H. 6. 1. 3 H will be negative for exothermic reactions (because internal heat is being lost) and positive for endothermic reactions (because internal energy is being gained). 6. 1. 4 The most stable state is where all energy has been released. Therefore when going to a more stable state, energy will be released, and when going to a less stable state, energy will be gained. On an enthalpy level diagram, higher positions will be less stable (with more internal en ergy) therefore, if the product is lower, heat is released (more stable, ? H is negative) but if it is higher, heat is gained (less stable, ?H is positive). 6. 1. 5 Formation of bonds : Release of energy. Breaking of bonds : Gain / absorption of energy. 6. 2 Calculation of enthalpy changes 6. 2. 1 Change in energy = mass x specific heat capacity x change in temperature ? (E = m x C x ? T) 6. 2. 2 Enthalpy changes (? H) are related to the number of mols in the reaction. If all the coefficients are doubled, then the value of ? H will be doubled. Attention must be paid to limiting reagents though, because enthalpy changes depend on the amount of reactants reacted (extensive property of enthalpy). . 2. 3 When a reaction is carried out in water, the water will gain or lose heat from (or to) the reaction, usually with little escaping the water. Therefore, the change in energy, and so the ? H value, can be calculated with E = m x c x ? T where E is equal to ? H, m is the mass of water pres ent, and c = 4. 18 kJ Kg-1 K-1. This ? H value can then be calculated back to find the enthalpy change for each mol of reactants. 6. 2. 4 The solution should be placed in a container as insulated as possible, to keep as much heat as possible from escaping.The temperature should be measured continuously , and the value used in the equation is the maximum change in temp from the initial position. 6. 2. 5 The results will be a change in temperature. This can be converted into a change in heat (or energy) by using the above equation and a known mass of water. This can be used to calculate the ? H for the amount of reactants present, which can then be used to calculate for a given number of mols. 6. 3 Hess’ Law 6. 3. 1 Hess’ Law states that the total enthalpy change between given reactants and products is the same regardless of any intermediate steps (or the reaction pathway).To calculate: ?Reverse any reactions which are going the wrong way and invert the sign of their ? H values. ?Divide or multiply the reactions until the intermediate products will cancel out when the reactions are vertically added (always multiply/divide the ? H value by the same number). ?Vertically add them. ?Divide or multiply the resulting reaction to the correct coefficients. 6. 4 Bond enthalpies 6. 4. 1 Bond enthalpy (aka dissociation enthalpy) : The enthalpy change when one mol of bonds are broken homolitically in the gas phase. i. e. X-Y(g) -> X(g) + Y(g) : ? H(dissociation).Molecules such as CH4 have multiple C-H bonds to be broken, and so the bond enthalpy for C-H is actually an average value. These values can be used to calculate unknown enthalpy changes in reactions where only a few bonds are being formed/broken. 6. 4. 2 If the reaction can be expressed in terms of the breaking and formation of bonds in a gaseous state, then by adding (or subtracting when bonds are formed) the ? H values the total enthalpy of reaction can be found. 16. 1 Standard enthalpy changes of re action 16. 1. 1 Standard state : 101 kPa, 298 K (or 1 atm, 25 degrees celcuis).Standard enthalpy change of formation : The enthalpy change when 1 mol of a substance is made from its elements in their standard states. For example C(graphite) + 2H2(g) -> CH4(g). Molecules, like H2 are considered to be ‘standard state'. Fractions of mols (i. e. fractions in coefficients), may also be used if necessary as 1 mol must be produced). 16. 1. 2 If a reaction can be expressed in terms of changes of formation (and bond enthalpies as in SL) then add up all the ? H values to get the ? H for the reaction. 16. 2 Lattice enthalpy 16. 2. 1Lattice enthalpy : The enthalpy change when 1 mol of crystals (i. e. an ionic lattice) is formed from its component particles at an infinite distance apart. M+(g) + X-(g) -> MX(s) The value of lattice enthalpy is assumed to be positive for the separation of the lattice, and negative for the formation of the lattice. 16. 2. 2 As above, lattice enthalpies just a dd another type of reaction to those which can be shown on the Born-Haber cycle. 16. 2. 3 Lattice enthalpy increases with higher ionic charge and with smaller ionic radius (due to increased attraction). 6. 3 Entropy 16. 3. 1 Factors which increase disorder in a system: ?Mixing of particles. ?Change of state to greater distance between particles (solid -> liquid or liquid -> gas). ?Increased particle movement (temperature). ?Increased number of particles (when more gas particles are produced, this generally outweighs all other factors). 16. 3. 2 Predict the sign of ? S (the change in entropy) for a reaction based on the above factors. ?S is positive when entropy increases (more disorder) and negative when entropy decreases (less disorder). 16. 3. 3The standard entropy change can be calculated by subtracting the absolute entropy of the reactants from that of the products. 16. 4 Spontaneity of a reaction 16. 4. 1 Reactions which release heat (and so increase stability) tend to occur as do reactions which increase entropy (? S is positive). Neither of these can be used to accurately predict spontaneity alone however. 16. 4. 2 When ? G is negative, the reaction is spontaneous, when it's positive, the reaction is not. 16. 4. 3 ?G = ? H – Temperature(in kelvin) x ? S Spontaneity depends on ? H, ? S and the temperature at which the reaction takes place (or doesn't as the case may be). 6. 4. 4 Substitute values into the equation above. Hopefully that's not too tricky. 16. 4. 5 There are four possibilities: 1.? G is always negative when ? H is negative and ? S is positive. 2.? G is negative at high temperatures if ? H is positive and ? S is positive (i. e. an endothermic reaction is spontaneous when T x ? S is greater than ? H). 3.? G is negative at lower temperatures if ? H is negative and ? S is negative (exothermic reactions are spontaneous if ? H is bigger than T x ? S). ?G is never negative if ? H is positive and ? S negative.

How far did America achieveprosperity in the 1920s? Essay

The 1920s was a time of great change in the USA’s economic situation. After the First World War, America experienced an economic boom, which led to the state of society changing by vast differences. These differences were also apparent in the way that the change effected different people in different situations. The number of people living below the bread line in 1928 increased to an estimated forty-two percent of the American population, however this was during the same period that the number of Americans owning cars was around one car to every five people. Therefore, there is great controversy over to what extent the USA achieved prosperity in the 1920s. Prosperity is a word that is used to describe affluence and wealth within a country. Estimating the rate at which a country experiences prosperity during a period would reveal hoe rich and well off that country was at the time. Many factors contribute and deduct from the prosperity of America during this period, as it is therefore difficult to say how far the current wealth of the country spread within all areas of society. Factors that would state that America’s prosperity spread throughout the nation during the 1920s include the new industries and new industrial methods of the time, mass marketing of new products and the motorcar industry. However, contradicting these areas of American industry include the farming situation at the time, overpopulation of the country, USA’s black population, new immigrants to the country and people involved in old industries. During the 1920s, new industries and new methods of production spread through American manufacturing. It was able to exploit it’s vast natural resources of raw materials to produce steel, chemicals, glass and machinery. These products then became the foundation for secondary industries- or consumer goods. Telephones, radios, vacume cleaners, and washing machines were mass-produced and therefore more people could afford them. Such an example shows hoe America was developing well as an industrial nation, and reveals how the people of the country were now able to buy consumer goods, which before were they were unable to afford. Within this same period, big industries were developing advertising and marketing techniques. Advertising companies were a resultant factor, and came about as groups developed their ideas of propaganda developed during World War One and applied them to industry. This aspect of American society is further evidence for how the USA was favouring the consumer aspect of living in the early twentieth century. Perhaps the most significant contribution to showing how all areas of America succeeded in achieving prosperity in the 1920s is the motor car industry. In 1900, only four thousand cars were built. By 1929, four million, eight hundred thousand were made- indeed it was believed that a Ford Model- T was completed every ten seconds. By 1928, the industry was America’s most successful, and employed hundred of thousands employees directly, and yet more indirectly. The car had vast impacts on the rest of American industry. The businesses supplying raw materials required to make a car also prospered at a similar rate. More glass, rubber and steel were required; boosting these areas of industry. Furthermore, increased amounts of petrol were required, and more people found employment- building miles of roads across the country to cater for the increased amount of traffic. The car industry also stimulated the housing industry. It meant that more people were able to buy homes away from the cities in the suburbs, and commute on a daily basis into town. This factor, I feel was the most important cause to America’s successful spread of prosperity in the 1920s. Apposed to these views, numerous factors exist which show evidence against the notion of America’s wealth in the 1920s being nationwide, and influencing every area of society. A clear example of an industry, and therefore it’s people, which did not benefit from this time is farming. The average farm income fell from twenty- two billion dollars in 1919, to thirteen billion dollars in 1928. This was largely due to the European market. During the war, American has shipped millions of tons off grain to Europe. However, the war also bankrupted Europe, meaning few people could afford American goods. Furthermore, the Republican tax on American goods was still in place, resulting in Europe sill unable to afford American produce. From 1900 to 1920, while farms were doing quite well, more and more land was being farmed. Improved machinery, especially combine harvesters and improved fertilisers made US agriculture extremely efficient. The result was that by 1920 it was producing surpluses of wheat, which nobody wanted. Farming communities were devastated as farms struggled to sell wheat, even at extremely low prices. The extent of this hardship is shown when it is realised around half of all Americans lived in rural areas. Mostly working on farms or in businesses that sold goods to farms. Therefore, this problem directly affected millions of people. As the farm income fell, the situation of many rural communities was desperate. It is clear when looking at the effects American prosperity had on it’s Black and new immigrant populations that current American wealth did not reach all areas of people. The black population was badly hit. They held the tradition of holding the least skilled jobs in rural areas. As they lost their jobs on the farms, three quarters of a million of them became unemployed. The majority of farming families remained very poor throughout the 1920s, meaning that they did not see the technological advances of the time- including electricity, cars and radios. New immigrant to the country at this time did not receive the great welcome of a liberated country they had all hoped. They faced discrimination in the work place, and took whatever work they could- partly because they were generally uneducated as other workers. A large number worked in the construction industry where, at the time, there was a big boom. However, despite this increase in the industries size, the average was only rose by four percent in the 1920s, because the immigrants were a source of cheap labour, and more work was becoming mechanised- resulting the lack of need for labourers. The unemployment rate within new immigrants rose throughout the decade. Older industries were undergoing modernisation. Some industries such as steel, for which there was a boom, benefited from general expansion. However, in others, particularly the raw materials industries- cotton, coal, tin and copper- were suffering. There was an overproduction in these industries, prices dropped and wages fell. From looking at this evidence, it is clear that the prosperity and affluence of the USA in the 1920 was highly apparent. However, it is also clear that it did not reach all areas of society. Therefore, it is justified to say that prosperity during this period was partial- as not everyone was buying cars, radios and other consumer goods. It is vital to remember that during a boom period, it is difficult to spread the wealth of the country evenly- due to the determination for personal gain, not for equality.