Open and Closed Source Systems Essay Example for Free

Open and Closed Source Systems Essay The GNU General Public License has served a major role in the way people think of programs today. The GNU, or simply GPL is originally written by Richard Stallman of the Free Software Foundation (FSF). The case is, most software’s don’t want you to share or change the program. This means that they are trying to take away freedoms of having the program. What the GNU General Public License is designed to do is the opposite of that because it offers freedom to share and change the software and to make sure it is free for all of its users. This creation caused it to be the most widely used free software license. As of August 2007 the GPL accounted for nearly 65% of the 43,442 free software projects listed on Freshmeat. Some believe that the copyleft provided from the GPL was crucial to Linux’s Success because it gave programmers who contributed to the kernel the assurance that the work done by them would benefit the world and remain free. After the first version of the GPL, more were made that followed. The first GPL was made in 1989. After that, another version was made with similar licenses but there was concern over problems in the GPLv2 so they made another one in June 2007. Preamble The General Public License was designed so that it meant that the people won’t think of a free software as related to its price but more to freedom. What this means is that people can do almost anything to the program including, making copies, giving away copies, selling the program, and either turning the original program into something that is better. What this license includes in its preamble is; each distributer must know that there is no warranty for this free library. With this license, comes great responsibilities for handling this. One example of this would be if you were tried to sell the program that you copied, you will have to tell them all their terms so they know their rights. The protection of a person’s rights is split into two sections; the first is you cope the library then second, you get offered this license which gives you legal permission to copy, distribute, and or modify the library. Terms and Conditions There are many terms and conditions that you have to go by while using this license because if you don’t go by them, there could be real harm. A library is a collection of software functions and or the data prepared so it can link with other application programs. You are only allowed to modify copies of the library if you show that you modified the library, you must make sure that there is no charge to third parties for the work to be licensed and you have to show them their terms to make sure they know their rights. If the license isn’t signed then you are not allowed to modify, copy or sell anything from a library because it’s prohibited by the law unless you have signed the license. If you create any attempts to copy, modify, sublicense, link with or distribute the library without this license, then you are prohibited from ever getting it and the library will be void. GNU Conclusion This idea that was released by Richard Stallman was brilliant in many ways. One major way it was important was it allowed people to sell programs for free and let people try them and not be controlled by companies. Freedom is important not the price of the program.

Competition vs. monopoly Essay Example for Free

Competition vs. monopoly Essay 1. Analyze the fast food industry from the point of view of perfect competition. Include the concepts of elasticity, utility, costs, and market structure to explain the prices charged by fast food retailers. Firms within the fast food industry fall under the market structure of perfect competition. Market structure is a classification system for the key traits of a market. The characteristics of perfect competition include: large number of buyers and sellers, easy entry to and exit from the market, homogeneous products, and the firm is the price taker. Many fast food franchises fit all or most of these characteristics. Competition within the industry as well as market supply and demand conditions set the price of products sold. For example, when Wendys introduced its $. 99 value menu, several other companies implemented the same type of changes to their menu. The demand for items on Wendys value menu was so high because they were offering the same products as always, but at a discounted price. This change in market demand basically forced Wendys competition to lower prices of items on their menu, in order to maintain their share of the market. The previous example illustrates the elasticity of the fast food industry. Supply and demand set the equilibrium price for goods offered by franchises within the industry. Competitors of Wendys must accept the prices established by the consumer demand for the value menu. If consumers didnt respond so positively to Wendys changes, other firms wouldnt have had to adjust prices. On the flip side of this concept, there is no need for franchises to further reduce prices below the current levels. At the current prices, firms may sell as much product as they want, thereby maximizing profits. This industry has a very high utility value. Utility is a measure of satisfaction or pleasure that is obtained from consuming a good or service. If consumers feel as if they get a good meal, at a good price, then theyre satisfied. This customer satisfaction coupled with relatively low prices keeps the industry profitable. Another quality of perfect competition that may be overlooked, but is vital to this industry is the ease of entry into the market. Start-up franchises within this market structure can begin operating with relatively low initial investments (compared to other industries). This is not the case where monopolies are concerned. There are numerous barriers to entry into monopolistic market structures, capital being one of the most prominent barriers. If a new franchise an offer the consumer a quality product at a reduced price, then the chances of success are greatly increased. For example, Chanellos and Little Caesars offer discounted pizza prices, and maintain the same quality as other pizza chains. These companies spend less on advertising and more on the actual product. Thats a very important concept in this industry, because their quality product at this discounted price gives them a niche in the market. Once a company establishes a niche, they become more visible to the consumer, thereby creating more demand, which leads to greater revenue. 2. Analyze sports franchises from the point of view of a monopoly. Sports franchises fall within the market structure of monopolies. Most professional sports teams fit most or all of the characteristics of a monopoly. For each sport, there are a limited number of teams and new entries into the league are few and far between. Also, there are many barriers to entry into the market, including large initial capital investment, dominance by one or few firms, and other legal issues that must be considered. An investor would initially need cash for payroll of players, payroll for management, advertising, playing facility, and many other miscellaneous costs. The new franchise owner would need to be very wealthy and have the backing of other wealthy individuals just to purchase the franchise. Once a franchise eventually enters the market, they have the ability to set the prices for that particular market. Monopolies are price makers and the products offered are not sensitive to changes in the market. The demand curve of a monopoly is not elastic, as is such in a perfectly competitive market. The monopolistic demand curve is the same as the curve for the industry since there is only one firm within the industry. This allows the franchise owner to maximize profits by setting the price of tickets and concessions at an amount that creates the most revenue. Consumers will pay the price, if they want to attend a particular sporting event, no matter how outrageous the price. This price setting is allowable, because unlike perfect competition, there are no substitutes. Cities may have two or three teams of different types of sports (i. e. baseball, hockey, football), but few cities have more than one professional team of the same sport. Sports franchises, although theyre monopolies are not all bad. These teams bring million and millions of dollars in revenue to the city in which theyre located. First of all, jobs are created in the construction of the sports facility. Then there is revenue to the city from taxes, consumer spending at hotels and restaurants, tourist visits and numerous other avenues. Sports franchises are similar to the fast food industry in the respect that they also have a very high utility value. Fans are pleased when they witness a very competitive, hard fought sporting event, and they are willing to pay to do so. Just look at the price of Super Bowl or NBA finals tickets. Spectators pay hundreds and even thousands of dollars to witness these events year in and year out. As long as the teams are competitive and there are superstar players, consumers will continue to watch and attend events regardless of the price.

Applications of DC series motors

Applications of DC series motors INTRODUCTION: WHAT IS ELECTRIC MOTOR? An electric motor is a device using electrical energy to produce mechanical energy, nearly always by the interaction of magnetic fields and current-carrying conductors. The reverse process, that of using mechanical energy to produce electrical energy, is accomplished by a generator or dynamo. Traction motors used on vehicles often perform both tasks. In principle, all electric motors can run as generators and vice versa, although that is not practical with all types in all applications. As a convention the term electric engine is not used for electric motors, but instead refers to a railroad electric locomotive. Electric motors are found in a myriad of applications such as industrial fans, blowers and pumps, machine tools, household appliances, power tools, and computer disk drives, among many other applications. Electric motors may be operated by direct current from a battery in a portable device or motor vehicle, or from alternating current from a central electrical distribution grid. The smallest motors may be found in electric wristwatches. Medium-size motors of highly standardized dimensions and characteristics provide convenient mechanical power for industrial uses. The very largest electric motors are used for propulsion of large ships, and for such purposes as pipeline compressors, with ratings in the thousands of kilowatts. Electric motors may be classified by the source of electric power, by their internal construction, and by application. The principle: The principle of conversion of electrical energy into mechanical energy by electromagnetic means was demonstrated by the British scientist Michael Faraday in 1821 and consisted of a free-hanging wire dipping into a pool of mercury. A permanent magnet was placed in the middle of the pool of mercury. When a current was passed through the wire, the wire rotated around the magnet, showing that the current gave rise to a circular magnetic field around the wire This motor is often demonstrated in school physics classes, but brine (salt water) is sometimes used in place of the toxic mercury. This is the simplest form of a class of electric motors called homopolar motors. A later refinement is the Barlows Wheel. These were demonstration devices only, unsuited to practical applications due to their primitive construction TYPES OF ELECTRIC MOTORS: 1. AC MOTORS 2. DC MOTORS SERIES MOTORS SHUNT MOTORS COMPOUND WOUND MOTORS DC Motors: A DC motor is designed to run on DC electric power. Two examples of pure DC designs are Michael Faradays homopolar motor (which is uncommon), and the ball bearing motor, which is (so far) a novelty. By far the most common DC motor types are the brushed and brushless types, which use internal and external commutation respectively to create an oscillating AC current from the DC sourceso they are not purely DC machines in a strict sense Series Wound: The series wound motor has only one voltage supply to the motor and the field winding is connected in series with the rotor winding. Universal Motors or Series wound: In a series wound DC motor, reversing either the field winding leads or the rotor winding leads will reverse the direction of the motor. However, simply reversing the leads from the power supply will have no effect on the direction of rotation since it is equivalent to reversing the current through both the individual windings in effect a double reversal. In other words the motor will turn in the same direction even though the current through the series windings is reversed. This means that the motor can run on alternating current as well as direct current since the direction of rotation is independent of the direction of the current through the series windings. Universal motors are often used in power tools and household appliances such as vacuum cleaners and food mixers. Characteristics: The series motor has poor speed regulation. It delivers increasing torque with increased motor current but this is at the expense of speed which falls with increasing torque demands. This motor has a very high starting torque because there is zero back EMF at zero speed however as the speed builds up so does the back EMF causing a reduction in torque.Increasing the load on the motor tends to slow it down, but this in turn lowers back EMF and increases the torque to accommodate the load. Speed control is possible by varying the supply voltage. Under no load conditions the speed will accelerate to dangerous levelspossibly causing destruction of the motor. The motor can be reversed by reversing the connections on either the field or the rotor windings but not both. Regenerative braking is not possible since the field current needs to be maintained but it collapses when the rotor current passes through zero and reverses. Applications: It is a variable speed motor i.e. very low speed at high torqe and vice versa. However at no load motor tends to occupy dangerous speed. The motor has a very high starting torque. So it is used for : The series DC motor is an industry workhorse for both high and low power, fixedandvariable speed electric drives. Applications range from cheap toys to automotive applications. They are inexpensive to manufacture and are used in variable speed household appliances such as sewing machines and power tools. Its high starting torque makes it particularly suitable for a wide range of traction applications. Industrial uses are hoists, cranes, trolly cars, conveyors, elevators, air compressors, vacuum cleaners, sewing machines etc. This is just an introduction to my term paper and it will be explained in final term paper.

Implications of Migration for Pro-poor Agricultural Growth :: essays research papers

differences etc. all of which influence migration patterns and remittance utilisation. Methods musttherefore be broadened to include more qualitative techniques and case studies. 2. Integrate migration and commuting into PRSPs, CASs, National Plans At present most key policy documents related to rural development, agriculture and povertyreduction pay little or no attention to migration. These should be reviewed where possible to integrate migration and commuting concerns. There needs to be a greater recognition of thecontribution of current and future mobility to development and poverty reduction. 3. Identify the conditions which stimulate the productive use of remittances Examples of productive investment of remittances should be studied to understand where and how this has occurred by giving special attention to: • Labour availability and household labour allocation decisions, how gender roles and cultural factors influences these decisions and the impacts of labour depletion on the household and local economy• The skills base of migrants and how/if this has changed through migration and whatcontribution that has made to developing/enhancing agriculture or enterprise in the source village• Existing constraints faced by the poor in key agricultural markets such as credit and labour and how remittances are used in situations of persistent debt crea ted byinterlocked markets – do remittances help the poor in escaping from thesearrangements?• Availability of key natural resources – water and land are probably the mostimportant. Are remittances invested in buying more land and is this used for production soon, later or never? Does the availability of water affect this pattern?The information from such studies can be used to identify appropriate complementary interventions The obvious ones are education and health – i.e. more educated and healthier farmers are morelikely to spend on better farm inputs and technologies etc. 4. Identify locations/situations where it would make more sense to facilitate the movement of people This would need to be decided on a case by case basis, say at the district level in order toaccommodate location specific historical, agro-ecological factors as well rates of urbanisation and agricultural development. The Chinese example is informative because mobility is being encouraged to reduce rural poverty and sustain the rural economy.5. Design transport services to suit poor migrants and commuters A number of research projects on transport conducted under by ITDG and through the DFID Knowledge and Research (KaR) projects have noted transport constraints, and their impact on rurallivelihoods and service provision are of a high priority for the rural poor.

Overview of Orthopedics Essay -- essays research papers

Overview of Orthopedics / The Orthopedic Team What is orthopedics? The word orthopedic comes from two Greek words:  ·Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  ortho meaning straight  ·Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  pedia meaning children Orthopedics is the branch of medicine concerned with diseases, injuries, and conditions of the musculoskeletal system - relating to the body's muscles and skeleton, and including the joints, ligaments, tendons, and nerves. The proper title of this medical specialty is orthopedic surgery, although orthopedics is a generally accepted term. Who treats orthopedic conditions? Orthopedic conditions may be treated by your physician and/or other medical specialists and healthcare providers. Several physicians from different medical specialties may be involved in the treatment at the same time. This multidisciplinary team approach is particularly important in managing the symptoms of an orthopedic condition, especially as many symptoms are chronic and change in severity over time. Some of the more common medical professionals involved in the treatment of orthopedic conditions may include the following:  ·Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Primary Care Physician A primary care physician is one who has specialized education and training in general internal medicine, family practice, or another first-level-of-care area. Primary care physicians are those who provide patients with any/all of the following: o  Ã‚  Ã‚  Ã‚  Ã‚  routine health care (including annual physical examinations and immunizations) o  Ã‚  Ã‚  Ã‚  Ã‚  treatment for acute medical conditions o  Ã‚  Ã‚  Ã‚  Ã‚  initial care for conditions that may become more serious or chronic in nature While your primary care physician may treat and/or diagnose your disease, he/she may refer you to a specialist for more specialized treatment of certain aspects of a disease.  ·Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Orthopedic Surgeon The physician who specializes in orthopedic surgery is called an orthopedic surgeon, or sometimes, simply, an orthopedist. Orthopedists are educated in the workings of the musculoskeletal system, which includes (but is not limited to) diagnosing a condition or disorder, identifying and treating an injury, providing rehabilitation to an affected area or function, and establishing prevention protocol to inhibit further damage to a diseased area... ...sp;  assisting children and adults in learning how to carry out daily tasks o  Ã‚  Ã‚  Ã‚  Ã‚  conducting group or individual treatment to help children and adults in a mental health center learn to cope with daily activities o  Ã‚  Ã‚  Ã‚  Ã‚  recommending changes in layout and design of the home or school to allow children and adults with injuries or disabilities greater access and mobility Occupational therapists work in a variety of different settings, including the following:  ·Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  hospitals  ·Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  rehabilitation centers  ·Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  schools  ·Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  home care agencies  ·Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  private practice  ·Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  government agencies  ·Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Podiatrist A podiatrist specializes in foot care and is licensed to prescribe medication and perform surgery.  ·Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Nurses Nurses specialized in the care of orthopedic conditions may assist your physician in providing care. In addition, these nurses will help you to understand your treatment plan and can answer many of your questions.

Shakespeare and Similarity of Gender Roles :: essays research papers fc

Shakespeare and Similarity of Gender Roles #2   Ã‚  Ã‚  Ã‚  Ã‚  Shakespeare, although historically gender biased, can be charged with giving both males and females similar characteristic traits within his plays. This can best be proven using the comparison of Portia from the â€Å"Merchant of Venice† to King Henry from â€Å"Henry V†. These two characters, barring gender, show common traits throughout both of these plays. They are also set into similar situations, such as marital issues, prank playing, and the use of disguises.   Ã‚  Ã‚  Ã‚  Ã‚  As audiences are introduced to each of these characters, they are shown both their wealth and intelligence. In â€Å"Henry V†, the audience is quickly given King Henry’s â€Å"free-spirited† background, but then is told of his miraculous change in demeanor after his father’s death. The Bishop of Canterbury explains it as â€Å"But that his wildness, mortified in him,/Seemed to die too; yea, at that very moment/ Consideration like an angel came/ And whipped th’offending Adam out of him,/ Leaving his body as a paradise/†¦Never was such a sudden scholar made† (1.1 27-33). Portia’s intelligence is explained best by the literary critic Mrs. [Anna Brownell] Jameson when she states that Portia is â€Å"distinguished by her mental superiority. [In Portia] intellect is kindled into romance by a poetical imagination† (38-39). Portia’s sense of humor and spiritedness makes itself known almost immediately when she is first introduced in â€Å"The Merchant of Venice† with her waiting woman, Nerissa. In this speech, which concerns the terms of her future marriage according to her deceased fathers’ will, Portia artfully and impertinently describes the suitors who have vied for her hand thus far (1.2). Forced marriage is a common bond that Portia shares with King Henry. According to her deceased fathers’ wishes, Portia must marry the man who chooses the correct casket from a choice of three. She has no say in the matter. Henry, also, has no say in whom he must marry. As King, he must cement England’s bonds with France, and thus make his marriage to Katharine a condition of Frances’ surrender. Portia, happily, ends up marrying the gentleman that she wishes. Henry decides to â€Å"woo† the Lady Katharine, supposedly falling in love with her. According to Desmond Seward, â€Å" The King†¦was enchanted by the girl. He regarded her as the only possible bride for him, if contemporaries are to be believed† (130-131). A strong parallel that Shakespeare creates between these two characters is their use of disguises.

R.E Coursework Religion and Medical Issues Essay

Ai) Infertility is when a couple cannot naturally conceive a child. There are many treatments to get around infertility; some of these, may however raise moral issues. There are many treatments available; Fertility drugs are one of these, this is where an infertile woman is given drugs, which stop infertility and make a woman capable of carrying a child. These are recognised by the church, as the sacredness of life is not threatened. AIH (artificial insemination by the husband), is another of these treatments. The sperm of the husband is taken and artificially put it in the wife. AID (artificial insemination by the donor), this is for if the man does not produce sperm. An anonymous donor donates his sperm, which is then artificially put into the woman. Gamete storing, is a fairly new process where the gametes are frozen, this means that if one of the parents has a treatment which makes them infertile, they can use the gametes which are stored. Surrogacy. This is where an alien hostess carries the baby. The sperm of the man is artificially inserted into the hostess. This is not recognised by the church because it is very similar to adultery. Aii) Roman Catholics have the view that life is sacred and therefore the sacredness of life must be protected. The church believes that no one has the right to children; if someone is infertile it is because it is supposed to be that way. Any of the treatments, which involve the destruction of embryos, are banned because this is the same as abortion and that is banned in the Catholic Church. The Church bans any of the treatments, which involve artificial insemination by the husband, as this involves masturbation, which is a sin in the eyes of the church. In AID and surrogacy the child does not get to know their biological parents, the church believes that the child has a right to know their biological parents. All forms of fertility treatments involve procreation outside of sex; God intended procreation to be part of the sex act. Other Christian churches allow IVF and AIH as they believe it is a good use of technology to provide families with the happiness of children. God intended families to have children, if IVF or AIH is the only way to do that it should be done. The egg and sperm are from the husband and wife and so it is not counted as adultery and therefore it is still a pure loving act. Some of the embryos are destroyed in these processes; embryos, which are not yet foetuses, so therefore it is not considered murder. The other churches still have major concerns about the other treatments; they have not banned them, however. All churches encourage childless families to adopt as they believe all children should have a loving happy family. iii) Generally Christians believe in transplant surgery and think that it is a good thing. Some Christians have some ethical issues, however. They believe that it would be wrong for rich people to pay for organs. It is well known that some wealthier 1st world citizens would be more than willing to exploit uneducated, 3rd world citizens to save themselves. This is known as the black market. The people in Africa may not be well educated and therefore do not realise that it is dangerous. It could be dangerous as the surgeon in Africa may be using dirty equipment and therefore the African would be vulnerable to infection. It is also exploiting the poor which is condemned by the bible. Some Christians are opposed to using organs from the dead but support using those of the living. They believe that organs such as the heart are an intrinsic part of the individual created by God. Transplanting organs from the dead into the living is usurping the role of God, and humans do not have the right to play God. This is a sin and is condemned by the Bible. Jesus taught us to love thy neighbour. If an organ can be transplanted while someone is alive then it is not vital and transplanting it would be, ‘loving thy neighbour.’ Some Christians believe all transplant surgery wrong and condemn it. They believe that transplants ignore the sanctity of life. This is a great sin in the eyes of the church. They believe that transplanting organs is ‘playing God’ and this is one of the great sins. They also believe that it is very expensive and requires very skilled people of which there are few. It raises the question of when someone is considered dead, as the heart needs to be removed when it is still beating. It diverts recourses from less expensive treatments which could help far more people than transplants. Most Muslims believe that transplants are wrong. They believe that it is against God’s will to remove anything from the body after death this means that none of the organs can be removed. They believe that God created each person and so to remove something from one and put it in another is to act as God which is the greatest sin in Islam. They believe that life is sacred and only God has the right to give and take it.