Free Essays on Computer Security

Computer Crime: Prevention and Innovation Since the introduction of computers to our society, and in the early 80’s the Internet, the world has never been the same. Suddenly our physical world got smaller and the electronic world set its foundations for an endless electronic reality. As we approach the year 2000, the turn of the millenium, humanity has already well established itself into the â€Å"Information Age.† So much in fact that as a nation we find our selves out of a service economy and into an information based economy. In a matter of only a few years almost all systems are run buy computers in some way, shape, or form. We depend on them for everything. Even the smallest malfunction or glitch in a system could now cause unfathomable amounts of trouble in everything from riding the bus, having access to your money, to getting your prescription at the pharmacists. Furthermore, Icove (1998) suggested that with the price of home computers that work faster and store more memory going down every yea r due to competition in the market, it is estimated that by the year 2011 most every American home will have a PC with instant access to the Internet. With an increase in users everyday and new businesses taking advantage of perks of an alternate electronic world, this information dimension will only get bigger, more elaborate, provide more services, and we will find society as a whole more and more dependent on it. However, even in an artificial environment such as the cyberspace, it appears mankind cannot escape from its somewhat overwhelming natural attraction to wrongful behavior or criminal tendencies. In turn this alternative dimension has been infected with the same criminal behavior that plagues our physical reality. The information age has opened the doors to anti social, smart, and opportunistic people to find new and innovative ways to commit old crimes. These people are called hackers. Schamalleger (1999), s... Free Essays on Computer Security Free Essays on Computer Security Computer Crime: Prevention and Innovation Since the introduction of computers to our society, and in the early 80’s the Internet, the world has never been the same. Suddenly our physical world got smaller and the electronic world set its foundations for an endless electronic reality. As we approach the year 2000, the turn of the millenium, humanity has already well established itself into the â€Å"Information Age.† So much in fact that as a nation we find our selves out of a service economy and into an information based economy. In a matter of only a few years almost all systems are run buy computers in some way, shape, or form. We depend on them for everything. Even the smallest malfunction or glitch in a system could now cause unfathomable amounts of trouble in everything from riding the bus, having access to your money, to getting your prescription at the pharmacists. Furthermore, Icove (1998) suggested that with the price of home computers that work faster and store more memory going down every yea r due to competition in the market, it is estimated that by the year 2011 most every American home will have a PC with instant access to the Internet. With an increase in users everyday and new businesses taking advantage of perks of an alternate electronic world, this information dimension will only get bigger, more elaborate, provide more services, and we will find society as a whole more and more dependent on it. However, even in an artificial environment such as the cyberspace, it appears mankind cannot escape from its somewhat overwhelming natural attraction to wrongful behavior or criminal tendencies. In turn this alternative dimension has been infected with the same criminal behavior that plagues our physical reality. The information age has opened the doors to anti social, smart, and opportunistic people to find new and innovative ways to commit old crimes. These people are called hackers. Schamalleger (1999), s...

In Search of Room-Temperature Superconductors

In Search of Room-Temperature Superconductors Imagine a world in which magnetic levitation (maglev) trains are commonplace, computers are lightning-fast, power cables have little loss, and new particle detectors exist. This is the world in which room-temperature superconductors are a reality. So far, this is a dream of the future, but scientists are closer than ever to achieving room-temperature superconductivity. What Is Room-Temperature Superconductivity? A room temperature superconductor (RTS) is a type of high-temperature superconductor (high-Tc or HTS) that operates closer to room temperature than to absolute zero. However, the operating temperature above  0  °C (273.15 K)  is still well below what most of us consider normal room temperature (20  to  25  Ã‚ °C). Below the critical temperature, the superconductor has zero electrical resistance and expulsion of magnetic flux fields. While its an oversimplification, superconductivity may be thought of as a state of perfect electrical conductivity. High-temperature superconductors exhibit superconductivity above  30  K (−243.2  Ã‚ °C). While a traditional superconductor must be cooled with liquid helium to become superconductive, a high-temperature superconductor can be cooled using liquid nitrogen. A room-temperature superconductor, in contrast, could be cooled with ordinary water ice.   The Quest for a Room-Temperature Superconductor Bringing up the critical temperature for superconductivity to a practical temperature is a holy grail for physicists and electrical engineers. Some researchers believe room-temperature superconductivity is impossible, while others point to advances that have already surpassed previously-held beliefs. Superconductivity was discovered in 1911 by  Heike Kamerlingh Onnes in solid mercury cooled with liquid helium (1913 Nobel Prize in Physics). It wasnt until the 1930s that scientists proposed an explanation of how superconductivity works. In 1933, Fritz and Heinz London explained the Meissner effect, in which a superconductor expels internal magnetic fields. From Londons theory, explanations grew to include the  Ginzburg-Landau theory (1950) and microscopic BCS theory (1957, named for Bardeen, Cooper, and Schrieffer). According to the BCS theory, it seemed superconductivity was forbidden at temperatures above 30 K. Yet, in 1986,  Bednorz and Mà ¼ller discovered the first high-temperature superconductor, a lanthanum-based cuprate perovskite material with a transition temperature of 35 K. The discovery earned them the 1987 Nobel Prize in Physics and opened the door for new discoveries. The highest temperature superconductor to date, discovered in 2015  by Mikhail Eremets and his team, is sulfur hydride (H3S). Sulfur hydride has a transition temperature around 203 K (-70  °C), but only under extremely high pressure (around 150 gigapascals). Researchers predict the critical temperature might be raised above  0  Ã‚ °C  if the sulfur atoms are replaced by phosphorus, platinum, selenium, potassium, or tellurium  and still-higher pressure is applied. However, while scientists have proposed explanations for the behavior of the sulfur hydride system, they have been unable to replicate the electrical or magnetic behavior. Room-temperature superconducting behavior has been claimed for other materials besides sulfur hydride. The high-temperature superconductor yttrium barium copper oxide (YBCO) might become superconductive at 300 K using infrared laser pulses. Solid-state physicist Neil Ashcroft predicts solid metallic hydrogen should be superconducting near room temperature. The Harvard team that claimed to make metallic hydrogen reported the Meissner effect may have been observed at 250 K. Based on exciton-mediated electron pairing (not phonon-mediated pairing of BCS theory), its possible high-temperature superconductivity might be observed in organic polymers under the right conditions. The Bottom Line Numerous reports of room-temperature superconductivity appear in scientific literature, so as of 2018, the achievement seems possible. However, the effect rarely lasts long and is devilishly difficult to replicate. Another issue is that extreme pressure may be required to achieve the Meissner effect. Once a stable material is produced, the most obvious applications include the development of efficient electrical wiring and powerful electromagnets. From there, the sky is the limit, as far as electronics is concerned. A room-temperature superconductor offers the possibility of no energy loss at a practical temperature. Most of the applications of RTS have yet to be imagined. Key Points A room-temperature superconductor (RTS) is a material capable of superconductivity above a temperature of 0  °C. Its not necessarily superconductive at normal room temperature.Although many researchers claim to have observed room-temperature superconductivity, scientists have been unable to reliably replicate the results. However, high-temperature superconductors do exist, with transition temperatures between  Ã¢Ë†â€™243.2  Ã‚ °C  and  Ã¢Ë†â€™135  Ã‚ °C.Potential applications of room-temperature superconductors include faster computers, new methods of data storage, and improved energy transfer. References and Suggested Reading Bednorz, J. G.; Mà ¼ller, K. A. (1986). Possible high TC superconductivity in the Ba-La-Cu-O system. Zeitschrift fà ¼r Physik B. 64 (2): 189–193.Drozdov, A. P.; Eremets, M. I.; Troyan, I. A.; Ksenofontov, V.; Shylin, S. I. (2015). Conventional superconductivity at 203 kelvin at high pressures in the sulfur hydride system. Nature. 525: 73–6.Ge, Y. F.; Zhang, F.; Yao, Y. G. (2016). First-principles demonstration of superconductivity at 280 K in hydrogen sulfide with low phosphorus substitution. Phys. Rev. B. 93 (22): 224513.Khare, Neeraj (2003). Handbook of High-Temperature Superconductor Electronics. CRC Press.Mankowsky, R.; Subedi, A.; Fà ¶rst, M.; Mariager, S. O.; Chollet, M.; Lemke, H. T.; Robinson, J. S.; Glownia, J. M.; Minitti, M. P.; Frano, A.; Fechner, M.;  Spaldin, N. A.; Loew, T.; Keimer, B.; Georges, A.; Cavalleri, A. (2014). Nonlinear lattice dynamics as a basis for enhanced superconductivity in YBa2Cu3O6.5.  Nature.  516  (7529): 71–73.   Mourachkine, A. (2004).  Room-Temperature Superconductivity. Cambridge International Science Publishing.

Accounting And Control-Free-Samples for Students-Myassignment

In the present case following are the variable expenses Direct material hence variable expenses Direct material hence variable expenses Indirect material hence variable expenses Direct labor not permanent hence variable expenses Administrative (inspector’s monthly salary) Indirect labor not permanent hence variable expenses Administrative (inspector’s monthly salary) Revenue per unit is $8 hence contribution per unit become $8-$6.6=$1.4 per unit. Fixed cost i.e. cost related to Annual machine and building depreciations is $75000. Hence breakeven units (in KG’s) become $75000/1.4= 53572 Kilograms. In the present case expected production for the year is 50000 kilograms which are below then the breakeven level hence it is suggested to the organization to do not operate in the coming year. 2.As per Cost volume profit analysis, a company should operate when sale volume of the company becomes either equal to breakeven point or above than breakeven point. The breakeven point is a level of sales where company’s operation would result in neither profit nor loss. Whenever production of the company becomes higher than this level then company’s operation will result in profits. In the present case, it is recommended to the company to operate in the year 2018 only if when company sale become 53472 kilograms or higher. Cost volume profit analysis depends on three assumptions i.e. fixed cost remains constant, variable cost per unit remains constant and sale price per unit remains constant (Kryvinska, Auer, & Strauss, 2011). If all these three assumptions hold good then results formed from cost volume analysis become always relevant and become reasonable for the company in making a decision without actually incurring a loss. Subject: Advise for reduction of risk of operating loss Jerahm and Angel are facing the dilemma regarding the operation of the Crunchy chips problem due to the importation of Chinese potato chips. Jerahm and Angel could make profits by revising their cost structure and so that operation becomes started to give a loss. As per cost volume profit analysis cost structure of any organization includes two types of costs one is a variable cost, which changes due to change in volume of sale and other is a fixed cost which remains contestant at each level of production and will not change due to increase and decrease in the level of production (Hansen, Mowen, & Guan, 2007). In the present case, only fixed cost of the organization is depreciation and all other costs are a variable cost. When company’s operating level was 150000 kilograms company’s contribution margin was higher and eligible to set off fixed cost but when company’s operating level come down to 50000 kilograms company’s contribution margin become lower and become ineligible to set off fixed cost. In the present case change in cost structure is not profitable because whenever company’s production becomes lower then it is recommended to make fixed expenses as a variable expense, but in the present case except depreciation, all expenses are already variable. The way to reduce operating loss is to either reduce variable cost per kilogram or increase sale volume (Horngren, 2009). If it is possible for the company to reduce its cost per kilogram regarding any or all variable cost then company become able to reduce loss because the decrease in variable cost per unit results in an increase in contribution per unit and increase in total profit. Another way to reduce operating loss of the organization is to increase sale volume. Increase in sale volume will result in the same contribution per unit but the increase in the total contribution and such increase in contribution will result in increase total profit. Hence as per cost volume profit analysis, it is advisable to the orga nization to either increase sale volume of decrease variable cost per unit. Hansen, D., Mowen, M., & Guan, L. (2007). Cost management: accounting and control. Cengage Learning. Horngren, C. (2009). Cost accounting : A managerial emphasis, 13/e. Pearson Education India. Kryvinska, N., Auer, L., & Strauss, C. (2011). An Approach to Extract the Business Value from SOA Services. International Conference on Exploring Services Science , 42-52.

Discuss how my life experiences have impacted me to go into the field Essay

Discuss how my life experiences have impacted me to go into the field of education - Essay Example My love of children has no bound. I like to watch, take care of, and be around children. They constantly amaze me. Children are like unfilled glasses. I want to be able to fill these glasses. To fill children with good things like knowledge, trust, and confidence should be the goal of every adult, especially teachers. These children are the future. I want my future to hold successful governments, new breakthroughs in medicine, and maybe even peace. Good role models is the only way to better the future, teachers are on the front line in that battle. Teachers are second only to parents when shaping a child’s life. Teaching children is not a job or career, for me it is personal fulfilment. To watch a child’s face as they learn something new makes me feel good. When a teacher teaches a child, they are giving the child skills they will use for the rest of their lives. When I was a child, I looked up and admired my teachers. One of my favourite game was school. Most of the time, I was the teacher to a playground of students. My personal teachers have inspired me. I am the person I am today due to good teachers. I want to become a teacher and give back to society what I received as a child. My background and personal skills also give me advantage in the field of education. I am in my forties. My age gives me the advantage over other applicants, due to my patience. Since I am mature, I am more determined to complete my education. Since I also have lived a full life this makes me more prepared than your average student. I am more than capable to juggle school and my personal life. I am less likely to drop out or have as many absences that younger students. If accepted to this university, I will complete the program. My maturity will positively affect my studies. My Latin background is also an advantage. My grandmother was a teacher in Cuba. My parents have always stressed the importance of living here, my

The Victims Of Domestic Violence Feelings Essay

The Victims Of Domestic Violence Feelings - Essay Example The feminist cultures progressively and constantly defend the women against critical issues including domestic violence. The belief that women can cause violent activities is relegated and quashed because it is believed that they are the victims. The defense of the women of the society makes it difficult to speak about men being victims of domestic violence. The portrays women as non-perpetrators of family violence. Most resources are often directed to the perceived victims who are the women. The narrative of men being victims is never discussed, and neither are resources allocated to create awareness concerning the challenges facing men in various partnerships.   The inconsistencies that are manifest in dealing with domestic violence makes it difficult to voice the violent propensities that males experience. The recognition of a problem commences if the society acknowledges a crisis and works towards resolving it appropriately. Violence against men in heterosexual or same-sex rela tionships is prevalent in several jurisdictions yet the stakeholders are not keen to improve on the situation. Men find it difficult to share their issues because they believe the society does not recognize domestic violence against them and minimizes its proliferation. The degree or measure of violence in a relationship cannot be underestimated or tolerated because of gender socialization.   It is difficult to talk about males as victims of domestic violence because of stigmatization.  

Museum and media studies at wildwalk Essay Example | Topics and Well Written Essays - 2250 words

Museum and media studies at wildwalk - Essay Example The strings that hold us all together are many - and more than that, they are common threads that date back to centuries and generations long gone. I would like to assert that there is a great deal of importance attached to the study and preserving of our history and roots.While the subjects are vast, the elements of such studies form a large platform for determining the socio cultural and geographical implications of recorded history and work in the same context. In this regard, museums are more than just buildings that house pieces for children to enjoy on a field trip. This thought was accentuated during a recent visit I paid to the Wildwalk based in the centre of Bristol. As far as the conception of museums and their aims go, they work to reproduce ideologies in order to lend credibility and authenticity to the existing order of things. Also, museums have been seen as instruments of social reform, which shows a variety of pattern. The first is that the objects in museums can exceed their designated roles as documents or specimens by revolving around the strategic placement to make them give out a certain message in terms of sounds and images. This conforms to the notion of the Wildwalk adopting a certain standard of media culture. The primary role here is to correlate people and material things, so that the museum becomes an important site for the development of new forms of experience, memory and knowledge. In this case, it has adopted an approach that is an amalgamation of the naturalism and simulation theories. In case of naturalism, it has been found that the heritage industry gained a boost when Thatcher's time saw the commemoration of Britain's past when its industrial sector faced a decline in the 1970s. In order to keep the tourist inflow steady, there was a new interpretation of the past heritage and glory in terms of commoditization of a museum and its objects which have helped remove conflict within communities that have lost out on this heritage. (Bird et al, 1993) So far media culture was represented only in fields like film, music and television. But during the latter half of the twentieth century, this concept began to make its foray into various aspects that adhered to the public sphere. Museums now place special emphasis on the conept of media culture owing to the fact that it provides a strong conetxt for the study and presentation of facts pertaining to various material and socil behaviour. In this way, media in museum studies provides an impetus to link cultures and origins. This a point of interest for scholars and visitors alike owing to the fact that the use of media for learning and experiencing something new has been proven as an effective tool. (Piror, 2006) This demonstrates the fact that museums can be theorized as a form of media. To take the case of both historical and contemporary examples, one would have to admit that these examples are clear in international instances as well. Take for example, the play of curiosity and the related use of media to satisfy the same through the avant-garde exhibition design of Lissitzy and Bayer. Also, the use of media has seen the age of experimental museums that have been ushered in by the likes of Paul Otlet and Otto Neurath. Further, science centres hold their own in terms of immersive and virtual museums with major developments such as Guggenheim Bilbao, Tate Modern in London and the National Museum of the American Indian in Washington D.C. (Piror, 2006) Based in nuances of iconography, the media aspect of Wildwalk is replete in the fact that it is a rainforest crammed with all kinds of live animals, plants and multimedia exhibits, which are waiting to be experienced. We use the word experience because here, one is in close contact with the nuances of the the awe inspiring diversity of the natural world in its spelndor. With an impetus to place facts and information in one's knowledge base through the use of creativity in media

Increasing numbers of criminal defendants who are involved with Essay

Increasing numbers of criminal defendants who are involved with illegal narcotics or have mental-health issues or both - Essay Example 178-190). Forced trading of illegal drugs among kids from poor backgrounds in the long-run psychologically affects them. The negative pressure exerted on the young boys in the poor communities force them to grow up stressed. In the long-run, they get into a state of depression or even end up psychologically disturbed. The topic of drugs is delicate but also unmentioned. As a result, there are more young people getting lured into the drugs trade. When more individuals get into the trade, its distribution gets broader (Petrila 5-11). Drug abuse with time has become a menace that needs close attention. The main users being innocent teenagers who got lured by peers suffer the consequences of engaging with the wrong peers. The law enforcement agencies in the past have punished these young criminals carelessly. Hence, the resulting outcome becomes recurrent crime and drug abuse. The young boys, mainly have had to engage in further criminal activities because their reputation has become questionable, and no one is willing to employ them. The drug cartels operating in poor neighborhoods have taken the advantage of the confused youths to lure them further into illegal forms of trade. In the past decades, the biggest percentage of the criminals engaging in illegal trade of drugs were male, but in recent years the percentage of girls or females have kept increasing (Stojkovic 163-179). Drug abuse among teenage girls has increased considerably. It has become the case because more girls have started consuming drugs. Most of the girls who consume narcotics come from poor backgrounds, and they also engage in prostitution. The consumption of narcotics also has caused an increase in crime. When an individual gets to consume narcotics, he or she becomes uncontrollable and may end up committing a crime unaware. Most of the time, the drugs mess up the mental status of an individual causing them to act abnormally in their