Computer Viruses :: essays research papers

A computer virus is a relatively small program that attaches itself to data and program files before it delivers its malicious act. There are many distinct types of viruses and each one has a unique characteristic. Viruses are broken up into to main classes, file infectors and system or boot-record infectors. A file infector attaches to ordinary programs usually affecting .COM and .EXE files. These two files are subject to infection though some can infect any program from which execution is requested. On the other spectrum, system or boot-record infectors infect executable codes found in certain system areas on a disk, which are not ordinary files. Not only are there two main classes of viruses, but there are also many different types. A virus can be classified as a boot sector virus, a program virus, a trojan horse virus, a macro virus, a memory resident virus, a stealth virus, or a polymorphic virus. A boot sector virus replaces the startup code on a disk with a modified version, which is loaded into the memory when the computer is started. Program viruses attach to legitimate program files. After attachment the program file will then intercept the program’s execution and take control of the computer system. Trojan horse viruses are also legitimate programs that are advertised as something desirable, but are actually something that is undesirable. It performs an unauthorized destructive act on your computer when executed. They received their name from the mythical Trojan Horse that was delivered to the gates of the city Troy. Macro viruses are written in macro language of specific computer programs, such as Word or Excel. These viruses infect files when a program document is accessed, or triggered by user actions, such as certain keystrokes or menu choices. Memory resident viruses hide in memory and are difficult to detect. When the virus is in memory it will infect any uninfected file that is executed. A stealth virus hides their presence. They can infect a program by adding bytes to the infected file. It then subtracts the directory entry of the infected file by the same number of bytes. This gives the impression that the file’s size has not changed, therefore, antiviral programs can not detect them through these changes. Polymorphic viruses modify their appearance and scramble their code periodically. This allows them to replicate so that none of its copies are the same. These viruses also all have different characteristics.

Descartes vs Hume Essay

Rene Descartes and David Hume touched upon epistemology on the same question, â€Å"where does human knowledge come from? † They both came to very different conclusions. Descartes claimed that our knowledge came from human reasoning alone and this is an absolute certainty principle. This faculty of reasoning is innate tool that came with human species. He called this tool, â€Å"mind,† which is separated from our body. Hume on the other hand, claimed that human learned from observing the empirical world, and connecting ideas using, â€Å"cause and effect. Rene Descartes realized that many of the things that he have accepted as the truth was false opinions, and consequentially the principles that were built upon them. He wanted to start anew by try to find out â€Å"the truth†, and then build upon that, because the foundation of science requires absolute certainty. In his attempt to find â€Å"the truth,† he started to criticize all of the things he had formally believed: applying the method of doubts, and then remove from the foundation what he found to be doubtable or deducible. He did this as he believed as his doubt increase, certainty decrease and vice versa. By the end of Meditation I, he was in a state called â€Å"Abyss,† where he was skeptical of all things and decided that the empirical world was presented to him by an evil demon He then reasoned that for him to be deceived by the demon, he must exist as something, a mind or a thinking thing After stating that his mind is the sole certain thing, he used wax to illustrate that human cannot achieve knowledge through sense, or imagination alone. He stated that just from observing a piece of already melted wax, he would not be able to identify it as the same piece of wax he had seen earlier in its former form, if he had not been witnessing the melting process. So, sense alone is not the source of knowledge. If he then removed every qualities that a piece of wax can be without, what remain is â€Å"something extended, flexible and movable. † From this explanation, a piece of wax could take any shapes and volume, which would not help him at all in identifying the nature of this piece of wax. Thus, imagination alone also could not be the source of human knowledge. He concluded that the nature of a piece wax can only be perceived through the inspection of the mind (pure reason) as the other two, sense and imagination, were ruled out. Thus, knowledge is a priori, and Descartes was a Rationalist. However, how could Descartes deny sense data completely, if he had to acquire the appearance of a piece of wax or the knowledge of its nature through sense data in the first instance (before it was melted). So he started the wax argument by contradicting himself by explaining to us what he sensed of a piece of wax. His reply was that an ordinary language almost as well led him to an error that he saw the wax (from sense data), but in the reality his faculty of mind interpreted the appearance in front of him to be a wax. Another of my objection to his argument is why creating a new thing, a faculty of mind, instate of combining what he already mentioned and known, which are sense and imagination. In later Meditation, He also use a circular argument to prove the certainty of his reasoning and mind, as he prove God to assure that his reasoning is not fooled by the demon, but we cannot forget that he used his reason to prove God in the first place. His desperation to prove God, and separation of mind and body might be due to the fact that he wanted to serve both of his passions; science and religion. He might be bias in this sense as he doubted until he found want he wanted to seek. David Hume attempted to prove that human knowledge comes from the empirical data and experience. He started by clearly distinguished between â€Å"impression† and â€Å"thought and idea† to illustrate that human applies our creative abilities, such as combine, transpose, enlarge and shrink, on our impression to generate thoughts and ideas. He gave two arguments for this position. The first one is human’s ideas and concepts are always complex mixture of simple ideas which are copies of the human’s sensation of the empirical world. The second argument is if a man hasn’t had any experience with a certain object, he would not have any ideas associate with that object. He challenged oppositionists to prove him otherwise, by giving him an example of thought and idea that is built upon something that had not been seen or heard of before. However, Hume, himself, gave one example that answered to his challenge which was â€Å"a missing shade of blue. † A man would be able to indentify that a shade of missing color from a color scale, even though he hasn’t seen that shade before. Hume stated this example is so singular, it is not worth considering. Hume then distinguished between two object of human knowledge; relations of idea, which are thing which if were denied would be a contradiction to itself, and matter of fact which its contradiction would still be possible. Hume’s interest was on the later one as he thought the first one was merely a definition or a logical statement. He claimed that the connection between our ideas is cause and effect. For someone to believe that a person can drown in water (effect), he must had before witnessed a drowning incident or had firsthand experience (cause). For Hume this connection cannot be known by a priori reasoning but always come from experience. Thus, this is a posteriori. However, he was convinced that cause and effect is merely a product of custom and habit. We experience it so many times that we generalize our future on our past, with no certain ground that it will continue to be like the past. This suggests that human knowledge is contingent. Hume could not come up with more certain explanation or step between cause and effect, but he convinced that it was there. Most Descartes was a rationalist. His work shows that knowledge can only be derived from pure reasoning through innate ability or the faculty of mind, which is certain and proven in Meditation II. He separated this from the body. This leads to a belief that human is more special, as our mind has an ability to provide superior reasoning with give us knowledge. This was in line with Christian belief that men are created in God’s image, which makes us special. By adopting his view, we as a species can rest assures that we are rational being who separated from the rest. Hume argued that our knowledge which comprised of matter of fact is based on experience, which human connect it using cause and effect. Cause and effect is merely human’s custom and habit. This makes human no more special than any other species in acquiring knowledge. He also implied that human knowledge apart from the relation of idea is contingent. If one has adopted Hume so strictly, one would abandon any knowledge that is not base on mathematic or experience such as metaphysic. Why believe or study it, if it base on something that is contingent, and cannot be proven in any sense.

Understanding The Real Life Events During The Oardwalk Empire

oardwalk Empire, the show that demonstrates the real-life events that occurred during the early 1920s in Atlantic City, New Jersey, represents several intercultural communication concepts. This historically-based drama series provided through HBO was chosen because of its wide variety of themes, conflicts, and plots driven through certain means of communication and interactions among the characters. For instance, the communication and intercultural models observed while watching the television show only enhance the audience’s entertainment and interest. Atlantic City was thrown back to the days of a lawless country, which was due to prohibition and the consumption of alcohol that was not going to be stopped by anyone. In fact, most political servants were involved in the daily activities and were either profiting from bootlegging alcohol or helping those who did. They profited monetarily and were in power and control because they could hide in the shadows and still appear to b e the pillars of society. It could be said that the very definition of prohibition in the early 1920s where a patron could have any alcohol he desired as long as he was willing to pay for it. The illegality of selling and drinking spirits affected the citizens’ lives, some positively and others negatively, and many were part of the extracurricular activities except those who obeyed the laws of the time. The three main concepts that will be discussed in much further detail include high power distance, a