Smoking in public places Research Paper Example | Topics and Well Written Essays - 1000 words

Smoking in public places - Research Paper Example For instance, one may smoke to ease tension or pressure. On the other hand, many people believe that smoking in public or generally smoking should be banned. There are reasons as to why this has not yet happened, and it is not bound to happen soon. Governments throughout the world make lots of profits from taxes on tobacco and cigarettes. Second, income from taxes collected can be used to put up social amenities such as parks. Lastly, tobacco industry carries with it many employment opportunities and hence a source of livelihood for many citizens. This paper is an analysis of smoking in public places, and it will also help us understand its effects and how people view this practice and what majority feel should be done. Despite the few positive impacts that come with smoking, many are the adverse impacts and effects that accompany smoking. To start with, smoking has been ranked as the primary cause of health problems globally (Fong, 15-45). According to information from health offices, one cigarette contains more than 4000 chemical substances that are the cause of the many health problems whereby 70 of these chemicals are known to cause cancer. These chemicals have for a long time been associated with diseases such as lung cancer, heart diseases, asthma or bronchitis. Reports have indicated that approximately 3,000 adults die each year in the United States due to lung cancer. This is a huge number compared to other causes of deaths in the same country. Another report from Britain indicated that while 3,500 people are killed e ach year in road accidents, 12,000 people die each year out of exposure to tobacco smoking (Hudson, par. 2-6). This shows that smoking has potential to take away many live more than other forms of health risks and people should be aware of all the risks that come along with smoking. Other than active smokers being exposed to dangers of tobacco smoking, passive smokers share the same fate. This is because passive smokers

Designing a Safer Passenger Aircraft Essay Example for Free

Designing a Safer Passenger Aircraft Essay Aircrafts have become more advanced and fast, but they are drastically affected by ignorance and design incapability. However these structures can fly with more than 200 passengers and heavy cargo, but when they crash, they take away with them many lives and damage valuable property. To prevent such loses several aviation safety agencies like EASA(European Aviation Safety Agency) and FAA(Federal Aviation Administration) have been functioning. These agencies implement and monitor safety rules for aircrafts. They also certify and approve organizations involved in the design, manufacture and maintenance of aeronautical products. Safety of an aircraft depends on every smallest possible detail of it. For designing a safer passenger aircraft a lot of investigation has to be done on flight failures, to prevent such failures. There are four main aspects considered while designing an aircraft: Aerodynamics, Propulsion, Structures and materials, Stability and control. An overview on the design of a fixed wing aircraft: The structure of an aircraft is configured as follows: A fuselage is a long cylindrical body with tapered ends to make its shape aerodynamically smooth. Fuselage carries flight crew, passengers, payload, fuel and engine. Fuselage also holds a large wing which provides sufficient lifting force to the aircraft due to the shape of its cross section (aerofoil). This large wing has ailerons to control rolling motion. The vertical stabilizers present at the rear end of the aircraft, stabilizes the yaw motion and horizontal stabilizers stabilizes the pitch. Elevators are mounted to the horizontal stabilizers and it controls the pitch of the aircraft. Engines provide the trust required for the aircraft. The landing gear is a set of wheels that supports the plane on ground. Control system of an aircraft: Yoke controls the pitch and roll motion of an aircraft. Rudder pedals control the rudder and thus it controls the motion about the yaw axis. Throttle lever controls the thrust produces by each engine and brakes slow or stop the airplane on ground. There are controls for flaps and spoilers. A tiller is used to steer the plane on ground. An automatic flight management system helps pilot in maintaining altitude or mode of flight. Analysis of investigation reports of some airplane crashes and preventive measures in design: A Pilatus aircraft crashed near Bert Mooney airport in July, 2011 due to loss of control. Investigation reports showed that there was icing within the fuel system causing low fuel pressure state as fuel system icing inhibitor was not added to the fuel before flight. All jet fuels contain trace amounts of water that form crystals and block the fuel system. Icing inhibitors decrease the freezing point to about -40? C preventing water from freezing. Some chemical detector can be introduced that could detect the concentration of icing inhibitors present in the fuel. An alarm can also be added to the electronic system of the aircraft which will remind the pilot of adding icing inhibitors while refueling. Aircrafts flying in cold weather develop icing on wings which greatly impair wings ability to generate sufficient lift. Air Florida flight crashed on take-off in January, 1982 as a result of ice on its wings. Modern airliners are designed to prevent accumulation of ice on wings, engines or tails either by routing heated area towards icing or by using inflatable rubber tubes that expand and break off any accumulated ice. Similar method can be used in the design or the accumulated ice can also be removed by sending small amplitude vibrations to the accumulated area. A Boeing cargo airplane experienced ground fire before engine start-up at San Francisco International airport. Investigation blames the design of the supplemental oxygen system hoses and the lack of positive separation between electrical wiring and electrically conductive oxygen system components. The lack of positive separation allowed a short circuit to breach a combustible oxygen hose, release oxygen, and initiate a fire. This can be taken care of in the design and either separation between the oxygen hoses and wiring can be increased or insulation of wiring can be made more strong. Composite materials used in structure of an aircraft consist of layers of fibers embedded in a resin matrix. These layers separate from each other when subjected to cyclic stress and they lose strength. This failure is not shown on the surface. An amphibian plane suffered a structural failure in Florida. The right wing of the aircraft separated during normal flight due to lack of maintenance. Ultrasound based instrument method is used to detect such failures in designing a safer aircraft. As in Air France Concorde crash case, pilot detected fire very late. Installation of video cameras at critical places can be a preventive measure as pilot will be able to keep a watch on plane if there is no other failure detecting mechanism. During high speed landing or take-off extreme pressure and heat build-up in tyres and in such conditions tyres burst. This is equivalent to explosion of 4-5 dynamites. This could damage the fuel tank or engines and even initiate a fire. Some cooling mechanism within tyres can be used to prevent such conditions of high temperature and pressure. Above safety concerns and all other governing factors can be considered to design a safer passenger aircraft. Apart form these problems foreign object debris, positive lightning, bird strike, volcanic ash can also be taken care of while designing an aircraft. Ground based navigation aids can also be improved by improving GPS systems and some backup modes of communication may help in significant reduction in air crashes due to lack of information and misleading.

Radiography in Ureterocele

Radiography in Ureterocele Ashley Norman One day wanting to be a mother, I can imagine that all you pray for is there to be no complications throughout the pregnancy. Walking into a doctor’s appointment for a routine ultrasound to check the baby and having the doctor say, â€Å"ma’am your baby has hydronephrosis and an ureterocele,† would be a very scary moment of the unknown. Because ureteroceles only occurs in about one of every 1,000 births, there would be many questions such as: what is an ureterocele, what tests will have to be done and what treatments will need to be taken (UCSF). As this became a reality to a friend of mine, all the questions must be answered. The field of radiography has different modalities and studies that use medical imaging that can diagnose and watch the condition of Ureteroceles. At nineteen weeks pregnant, Emily was told that Trent had severe hydronephrosis in his right kidney found on the ultrasound (Davis, 2014). One might be wondering, what is hydronephrosis? It is the distention of renal pelvis and calyces with urine (Eugene D. Frank, 2012). Another ultrasound done at twenty-four weeks showed the ureterocele. An ureterocele, a congenital condition, is a ballooning of the lower end of the ureter inside the bladder (Boston) (Philadelphia). This may cause part or the entire stream of urine from flowing freely into the bladder. It may also cause the backward flow of urine into the child’s kidney causing vesicoureteral reflux or VUR (Philadelphia). Ureteroceles are ten times more common in girls than boys, occur most often in Caucasians and vary in size (Boston). Trent is Caucasian, though he is a more rare case being a boy. Like Trent’s, the ureterocele is continued to be seen on the ultrasounds throughout the pregnancy. As determined, Ureteroceles are most commonly found from an ultrasound before the child is born or within a few days after birth. They are also used often to manage babies with hydronephrosis (Philadelphia) (UCSF). This modality of radiology called ultrasound or sonography is a noninvasive procedure that uses high-frequency sound waves to produce echoes within the body. The transducer sends and receives sound wave signals as it is moved over the surface of the body producing an image in real-time on a computer monitor. Learning the due date, revealing the presence of more than one child and the sex of the child or children are all familiar things that ultrasound determines. Conditions affecting the organs and tissues of the body such as the heart, gallbladder, liver, kidneys, and bladder may be determined by the use of sonography (WebMD Ultrasound). A renal bladder ultrasound is often used because its spotlight is specifically on the kidneys and bladder (Boston). The severity of the babies’ hydronephrosis and the presence of an ureterocele is valuable information shown on the RUS for the doctor. At about 16 or a18 months old, Trent had an RUS before he had surgery. Post surgery, Trent had another RUS to check the status (Davis, 2014). Again, ultrasound or sonography is the most common modality used to find Ureteroceles. Another study done to identify or evaluate the ureterocele is a voiding cysto-urethrogram or VCUG. The child will have a catheter placed through the urethra into the bladder (Philadelphia). A contrast material will be introduced against the normal flow or retrograde (Eugene D. Frank, 2012). As the contrast is filling the bladder fluoroscopy will be used to take pictures. Fluoroscopy is a type of medical imaging that is real-time showing continuous x-ray images on a monitor (FDA). Pictures will continue to be taken until the bladder is full and then again as the child voids or urinates. The VCUG study is done to confirm if VUR, reflux or backwash of urine into the ureter, is occurring because this would affect how the ureterocele is treated (UCSF). A VCUG was performed on Trent pre and post surgery (Davis, 2014). This procedure may be done more than once to continue to monitor the size and severity of the ureterocele along with any harm that may develop to the child’s kidneys. Nuclear medicine is another modality of radiography that â€Å"uses a special camera, gamma, to take pictures of tissues and organs in the body after a radioactive tracer, either radionuclide or radioisotope, is put in the vein in the arm and is absorbed by the tissues and organs. The radioactive tracer shows the activity and function of the tissues or organs† (WebMD Nuclear Medicine). A nuclear renal scan is done using nuclear medicine with one of two types of substances: DTPA or Mag3. Both are radiopharmaceuticals that may be used but very young children or someone with poor kidney functions will have better images if Mag3 is used (Nandurkar, 2009). The difference in function between the two kidneys may be measured along with the degree of blockage in the urinary system (Boston). Before surgery, a Mag3 scan was completed on Trent giving information on why the surgery was being performed and the severity (Davis, 2014). Using this modality of radiography, Nuclear Medicine, and its renal scanning test, ureteroceles may be identified and monitored. Finally, the modality of Magnetic Resonance Imaging or MRI may be used for ureteroceles. â€Å"MRI is a noninvasive diagnostic modality that does not use ionizing radiation.† The images on the computer monitor are provided by a powerful magnetic field and radio frequency pulses that are combined to produce a radio signal in the body that can be detected and processed electronically (Ehrlich, 2009). Although Trent has not had an MRI yet, when he does there will be very detailed pictures of the kidneys, ureters and bladder that can be taken and stored for diagnosis, monitoring and comparing of ureteroceles (Davis, 2014). The treatment of an ureterocele is dependent upon many factors such as the size, degree of obstruction, function of the kidney, presence of VUR and affects of the bladder. Although not all are helped by endoscopic surgery, it is one treatment that may be used to fix the ureterocele (Boston). Trent’s doctors at the Children’s Hospital in New Orleans chose this treatment. The endoscopic surgery is a minor procedure, no incisions made, which is usually done in an outpatient setting. A cystoscope, a lighted tube, is inserted into the urethral opening to see inside the bladder showing areas that may not show up well on X-ray images (Philadelphia). When the ureterocele is reached it will be punctured or popped, therefore relieving any obstruction. After the puncture, a VCUG is often performed to look for any reflux. Renal ultrasounds are also performed following the puncture to â€Å"ensure that any dilation has improved and that the ureterocele has gone away (UCSF).† Unfortunately, Trent was a case that the endoscopic surgery did not help (Davis, 2014). His mom and dad now have a waiting game to see if any further actions must be taken to try and solve his ureterocele. Through the field of radiology, different modalities and studies, Trent can be monitored and enjoy being a little boy, doing what little boys enjoy while his mom and dad trust the field of radiography and the advances that continue to keep their baby safe. Works Cited Boston, C. H. (n.d.). Ureterocele. Retrieved February 16, 2014, from Boston Childrens Hospital: http://www.childrenshospital.org/health-topics/conditions/ureterocele Davis, E. (2014, February). (A. Norman, Interviewer) Ehrlich, R. A. (2009). Patient Care in Radiography. Missouri. Eugene D. Frank, B. W. (2012). Merrills Atlas of Radiographic Positioning and Procedures. Missouri: Jeanne Olson. FDA. (n.d.). Medical X-Ray Imaging Fluoroscopy. Retrieved March 4, 2014, from FDA Gov: http://www.fda.gov/Radiation-EmittingProducts/RadiationEmittingProductsandProcedures/MedicalImaging/MedicalX-Rays/ucm115354.htm Nandurkar, M. M. (2009, May 01). Nuclear Medicine Renal Scan. Retrieved March 4, 2014, from Inside Radiology: http://www.insideradiology.com.au/pages/view.php?T_id=43#.UyHAJVBdW8A Philadelphia, T. C. (n.d.). Ureterocele. Retrieved February 16, 2014, from The Childrens Hospital of Philadelphia: http://www.chop.edu/healthinfo/ureterocele.html UCSF, D. o. (n.d.). Ureteroceles. Retrieved February 16, 2014, from University of California, Department of Urology: https://urology.ucsf.edu/patient-care/children/urinary-tract-obstruction/ureteroceles WebMD Nuclear Medicine, T. (n.d.). Nuclear Mediciine Scan. Retrieved March 4, 2014, from WebMD: http://www.webmd.com/a-to-z-guides/nuclear-medicine-scan-topic-overview WebMD Ultrasound, T. (n.d.). What is an Ultrasound? Retrieved February 16, 2014, from WebMD: http://www.webmd.com/a-to-z-guides/what-is-an-ultrasound

The Three Faces of Eve Psychology Analysis

The Three Faces of Eve Psychology Analysis The Three Faces of Eve, the 1957-true-based Hollywood film, deals with the case based on a true womans mental illness and her treatment as well. In the film, she is presented as Eve White, who is a shy wife and mother, just a common woman of the era. This woman is subject to severe headaches and blackouts, thats why she is sent to see Dr. Luther, a personality psychiatrist. During a conversation with his patient a new personality, Eve Black emerges, at this stage Eve White self is unaware of Eve Black, but Eve Black knows everything about Eve White. Eve Black had an extroverted, insinuating and liberal personality, she liked to smoke, dance and date men, she was single. After Eve Black becomes the dominate personality, Eve Whites husband abandons her and their daughter. After that Eve White is hospitalized after Eve Black tried to kill Eve Whites daughter. After that, Dr. Luther considered that both selfs personalities are inadequate, through hypnosis he attempts to get a traumatic event in Eves childhood, this is when he finds out that, when she was six, her grandmother died and every relative was supposed to kiss the dead body, as a way of making it easier to let go. According to the film, that was the reason she split into several personalities. During a hypnosis session, a third personality arrives, Jane, who was more stable. This personality eventually merges the other two into a single one, becoming a normal person again. Later she marries again and reunites with her daughter. During the film, some persuasive fact was that Dr. Luther asked for some other doctors opinion for the case, given the situation of not having previous studies available nor the necessary reference information at that time. The film reveals different methods to convey messages such as Dramatic, for example, the way in which the switch from one personality to another was made, understanding this was a way for the audience to know that this was happening, the acting and the sound. Another method was Humorous, an example is a way they presented Eve Black and how she behaved in the film, sometimes when she appeared, the background music was insinuating, and another one was when Eve Black tried to dance with her doctor. The last method was Factual when she was taken as a subject of studies and also when they showed all the symptoms Eve had, such as headaches, hearing voices, amnesia, and blackouts. Humor was used as a way of establishing the difference between one personality and another, thereby, the audience could perceive clearly the difference between the different personalities the character had. Some techniques are used to set the mood /give insight into the characters mood state, for example, sometimes Eve White cried as an evidence of sadness and worries when she was talking to Dr. Luther. The film also showed an Eve Black always happy when she danced with the music. Eve Black, by lying in bed, she showed she was also mad because she was tired of being in the mental hospital. She cried when her husband yields at her. The movie used music combination to show saddens. This film reveals a mental illness called Dissociative Personality Disorder (DPD), in which a person could adopt up to 100 new identities. Each self or identity, simultaneously coexisting with each other. One hundred alters is considered extreme, but cases around 15 is an average. In some cases, the identities can be complete and they have their own physical gestures, the tone of voice. The transition from one personality into another, it is called a switch. Even though the switch is usually quick, it may be exaggerated in movies, just like happened in this case. As in the real-life case of DPD, just like from which this film was based upon, rarely manifest so few personalities, actually, the woman who inspired this movie, in fact, said that she had twenty-six different personalities inside her psyche. Others documented cases run into dozens of personality manifestations. The portrayals of this mental illness in this film could be considered positive somehow because in the 50s there was not enough information about this mental illness. As a start, the way to present the symptoms, the complete personalities, could be considered somewhat right but not accurate. The portrayal showed that and early-childhood trauma was the cause for this woman to have DPD, but people with dissociative identity disorder tend to have histories of recurring life-threatening traumas such as physical or sexual abuse before age of nine, and the cause may also be extreme emotional abuse or neglect. So, in this case, the abusive husbands treatment could have been the reason too.   Ã‚   Work cited page David Schuette (2016, November 22). Retrieved from https://www.youtube.com/watch?v=gtBpM2Z98Xs Wilcox, D. L., Cameron, G. T., Reber, B. H. (2014). Public relations: Strategies and tactics (11th ed.). Boston, MA, United States: Pearson College Div.

Worldwide Denial of Global Warming Essay -- Essays Papers Environment

Worldwide Denial of Global Warming As human beings, we need to respect the environment in which we live. This is important to greater our future and that of others to follow. Very few people realize that their daily behaviors have a direct impact on the environment, the atmosphere in particular. By emitting harmful gasses into the air on a daily basis is one of the main reasons of such climate changes. People notice such changes and yet don't do anything to help the situation. Wee don't realize the risks that such changes in temperature pose. Rather than trying to conserve gas or taking cold showers, we still go on through our daily activities reluctant to change that will in time benefit the earth. By conserving gas and other harmful emissions like oil and electricity we are lessening the risks of global warming. By recognizing the potential risks, it will become easier to find practical solutions. There have been some steps toward conserving gas. Hybrid cars are becoming more and more popular among Americans and as well as other consumers. These cars will use less gas to get more mileage. Honda, is taking .steps toward lowering harmful gasses into the atmosphere by introducing these futuristic cars to the American public The main purpose of these cars is to reduce the dependency on gas for automobiles. As cheap college students, we all know how expensive gas is today, wouldn?t you rather save all the money you spend on gas and use it for other things like beer, clothes or other recreational purposes. The effects of global warming will have a lasting impact on the entire world. All people in all nations will experience unfortunate outcomes if something isn?t done soon. ... ...ed are called ?renewables.? ?Renewable energy technologies use solar, wind, hydropower, geothermal, or biomass energy? (United States EPA). Such new technologies are clean compared with traditional energy technologies, which burn fossil fuels such as oil and gas and can be used to solve many environmental problems. Work cited Frazier, Ian. ?As The World Burns.? Mother Jones March/Apr. 2003: Vo.28. 2: Academic Search Premier. EBSCO Marshall, George and Mark Lynas. ?Why We Don?t Give A Damn.? New Statesman 21 Jan. 2003: 132. 4666: 18+.Academic Search Premier. EBSCO Schulz, Kathryn. ?Global Warming Right Now.? Rolling Stone 20 Feb. 2003: Iss.916 Academic Search Premier. EBSCO United States Environmental Protection Agency (EPA). Renewable Energy: The Road from Global Warming To a Cleaner Future Office of Policy. September 1998.

Search Engines Essay -- essays research papers

There are currently over a billion pages of information on the Internet about every topic imaginable. The question is how can you possibly find what you want? Computer algorithms can be written to search the Internet but most are not practical because they must sacrifice precision for coverage. However, a few engines have found interesting ways of providing high quality information quickly. Page value ranking, topic-specific searches, and Meta search engines are three of the most popular because they work smarter not harder. While no commercial search engine will make public their algorithm, the basic structure can be inferred by testing the results. The reason for this is because there would be a thousand imitation sites, meaning little or no profit for the developers. The most primitive of searches is the sequential search, which goes through every item in the list one at a time. Yet the sheer size of the web immediately rules out this possibility. While sequential might return the best results, you would most likely never see any results because of the web’s inflammatory growth rate. Even the fastest computers would take a long time, and in that time, all kinds of new pages will have been created. Some of the older ‘spiders’ like Alta Vista are designed to literally roam randomly through the web using links to other pages. This is accomplished with high-speed servers with 300 connections open at one time. These web ‘spiders’ are content based which means they actually read and categorize the HTML on every page. One flaw of this is the verbal-disagreement problem where you have a particular word that can describe two different concepts. Type a few words in the query and you will be lucky if you can find anything relates to what you are looking for. The query words can be anywhere in a page and they are likely to be taken out of context. Content-based searches can also be easily manipulates. Some tactics are very deceptive, for example â€Å"†¦some automobile web sites have stooped to writing ‘Buy This Car’ dozens of times in hidden fonts†¦a subliminal version of listing AAAA Autos in the Yellow Pages†(1). The truth is that one would never know if a site was doing this unless you looked at the code and most consumers do not look at the code. A less subtle tactic is to pay to get to the top. For example, the engine GoTo accepts payment from those who wish to b... ... meta search engine can achieve several advantages: 1 It will present to users a more sophisticated interface†¦ 2 Make the translation more accurate 3 Get more complete and precise results 4 Improve source selection and running priority decisions† (3). Again the idea of optimizing the Internet through intelligent software shows up. It is just a matter of designing a certain algorithm that does not forget what it has learned. Most people did not foresee the tremendous growth of the Internet in the 1990’s. Computer algorithms have gone from small government programs to every personal computer in the world. You start with the most basic problem solving and end up with the most complex of problem solving. That of course is sorting through a database that grows almost exponentially. Plain and simple, the Internet has a lot of information on it. A crawler works twenty-four hours a day digging through it all. The search engine pulls out the parts people want and hands it to the Meta search engine. The Meta search engine further discriminates until you get exactly what you are looking for. Yet behind all this are machines performing the instructions they have been given – an algorithm.

Transatlantic Airlines Report

We have analyzed the existing booking policy of TransAtlantic Airlines and identified potential cost saving.The implementation of the suggested new booking policy would lead to reduction of total expected costs per flight on average by  £8,100.Furthermore, the new policy would increase the predictability of total costs per flight. With 90% confidence new costs will be in a range  £750 and  £4,800 as compared to the current range of  £1,900 to  £20,300. The comparative description of the policies is presented in table 1.Analysis of existing policy quick fixBase case modelThe foundation of current policy is based on the analysis in table 1. We observe that the total costs for both classes are  £6,250. The analysis of existing model indicates that there are two controllable variables in yellow (booking level in both classes) and two uncontrollable variables in green (no-show %).Table Foundation of existing policyThe available data indicates that current policy assumes some e mpty seats on the plane. As there is no immediate justification to this assumption, overbooking of the plane should be targeted to minimize the costs.Table Quick policy fix By increasing the booking level for both classes,  £0 costs can be achieved (table 2).Scenario analysisTransAtlantic does not have data retention policy in place. Hence, TransAtlantic has applied the consensus of experts for the scenario analysis. The percentage of no-shows varies between 3% and 8% in economy class and 15%-30% in business.Our calculations indicate that base case scenario is equal to the best case scenario. The main reason is that both cases of over- and under booking the company incurs costs, therefore the cost minimization is only achieved when the number of passengers in each class taking the flight is equal to the corresponding capacities (table 1).In the worst case scenario, we assume the maximum no-show in both classes. The data in table 3 demonstrates that the cost of the missed opportuni ties (e.g. missed fare) is much higher than the passenger compensation costsWe have calculated that in the worst case the company can experience the loss of revenues of  £23,250 per flight.Table Worst case scenarioSensitivity analysisWe have identified that there are two independent uncontrollable variables in our model. The best way to quantify the uncertainty without the simulation is to conduct a sensitivity analysis.One-way sensitivity analysis allows identifying the influence of each variable on the total costs.Expectedly, we observe that zero-cost for economy class happens at 5% of no-show and for business class is 20%, as these levels are equal to full capacity utilization in each class.Any deviation from these levels results in the increased costs for the company. For the economy class the increase of no-shows by 1% point results in the loss of  £1,800, while a decrease of 1% point results in the loss of  £600. In business the corresponding figures are  £1,450 and  £300 (figure 1).In relative terms, the costs of 1% increase are 3 times and ~5 times higher than the costs of 1% decrease in no-shows for economy and business class correspondingly. The observation leads us to conclude that overbooking is a viable option for the airline. Analysis of two way sensitivity (Appendix A), helps us to identify the sweet spot of costs of no-shows (colored green).SimulationPolicy comparisonIn the simulation analysis we assumed triangular probability of no-shows based on the available data (economy: between 3%-8%, most people 5%; business: between 15%-30%, most common 20%). We have also used 5,000 iterations to calculate final results. Table 5 summarizes the results.Table Simulation output analysisAccording to our analysis the mean of the current policy equals  £10,800. This value is different from  £6,250 as the new estimated mean represents the expected value, which are the average costs weighted by their respective probabilities. The previous estimati on indicates solely the costs at one point.Quick look at the summary table helps us identify that the proposed quick fix is the least value destructing policy out of three policies. It has the lowest mean of total costs, the lowest probability of exceeding  £10,000 as well as the narrowest range of the cost.To be more assured, we have additionally conducted probability dominance analysis (figure 2), which tells that both current and quick fix policy have deterministic dominance (always better) then no overbooking policy (green line). Whereas the quick fix (blue line) has stochastic dominance over currently employed policy (red line). The outcome of current policy maybe occasionally better than our proposed solution, but in the majority of cases the quick fix policy will be better.Figure 2 Probability dominance analysisPolicy optimizationIn order to identify the optimal booking policy we have conducted simulation with 40 different booking levels for business and economy. As these t wo variables are independent, we have conducted consequential analysis. Results for business class level booking are in (figure 3). The detailed information about tested values is in Appendix B.Figure 3 Optimal booking policyWe have observed that the lowest expected value of total costs is achieved at 427 and 133 accepted reservations for economy and business respectively. The comparison of current policy against new policy can be found in table 6.Table Current vs new policy comparisonFurther model improvementsIt has been suggested that passengers upgraded from the economy class to business class, can additionally reduce costs.We have included this condition in the model and run the simulation with different booking levels for business and economy (see section on optimization). Expected booking levels are not affected by this change. No further adjustments to the booking levels are necessary due to overbooking in both classes,Nevertheless, in some instances, as we consider the whole spectrum of possibilities, we observe that there are occasions at which business class is not fully occupied. By introducing upgrade possibility we can indeed improve our overall results as seen from the following summary table 7.Table New policy with upgrade option Even though the improvement to the mean is limited to  £200 and the range adjustments also non-significant, we almost eradicating the chance of incurring costs more than  £10,000.This result ascribes to the partial offsetting of business opportunity costs (fare of  £1,450), with collected fare from economy class passengers of  £450 and the omission of compensation cost of  £150 to economy customers for overbooked flights. Thus, TransAtlantic airlines incurs only the cost of  £850 per business passenger instead of  £1,450 under the circumstance that business class passengers don’t show up and leave seats to extra passengers of economy class.