Types Of Operating Systems Computer Science Essay

Types Of Operating Systems Computer Science Essay An operating system, or OS, is a software program that enables the computer hardware to communicate and operate with the computer software. Without a computer operating system, a computer would be useless. In computing. operating system (OS) linked between hardware and user, which is responsible for the management and coordination of activities and the sharing of the resources of a computer, that acts as a host for computing applications run on the machine. One of the purposes of an operating system is to handle the resource allocation and access protection of the hardware. This relieves the application programmers from having to manage these details. Explanation At the simplest level, an operating system does two things: It manages the hardware and software resources of the system. In a desktop computer, these resources include such things as the processor, memory, disk space and more (On a cell phone, they include the keypad, the screen, the address book, the phone dialer, the battery and the network connection). It provides a stable, consistent way for applications to deal with the hardware without having to know all the details of the hardware. Operating systems offers many services to application programs and usersApplications access these services through application programming interfaces (APIs) or system calls. By invoking these interfaces, the application can request a service from the operating system, pass parameters, and receive the results of the operation. Users may also interact with the operating system with some kind of software user interface like typing commands by using command line interface (CLI) or using a graphical user interface. For hand-held and desktop computers, the user interface is generally considered part of the operating system. On large multi-user systems such as Unix-like systems, the user interface is generally implemented as an application program that runs outside the operating system. Types of Operating Systems As computers have progressed and developed so have the types of operating systems. Below is a basic list of the different types of operating systems. Within the broad family of operating systems, there are generally four types, categorized based on the types of computers they control and the sort of applications they support. The categories are: 1.Real-time operating system (RTOS) Real-time operating systems are used to control machinery, scientific instruments and industrial systems. An RTOS typically has very little user-interface capability, and no end-user utilities, since the system will be a sealed box when delivered for use. A very important part of an RTOS is managing the resources of the computer so that a particular operation executes in precisely the same amount of time, every time it occurs. In a complex machine, having a part move more quickly just because system resources are available may be just as catastrophic as having it not move at all because the system is busy. 2. Single-user, single task As the name implies, this operating system is designed to manage the computer so that one user can effectively do one thing at a time. The Palm OS for Palm handheld computers is a good example of a modern single-user, single-task operating system. 3. Single-user, multi-tasking This is the type of operating system most people use on their desktop and laptop computers today. Microsofts Windows and Apples MacOS platforms are both examples of operating systems that will let a single user have several programs in operation at the same time. For example, its entirely possible for a Windows user to be writing a note in a word processor while downloading a file from the Internet while printing the text of an e-mail message. 4. Multi-user A multi-user operating system allows many different users to take advantage of the computers resources simultaneously. The operating system must make sure that the requirements of the various users are balanced, and that each of the programs they are using has sufficient and separate resources so that a problem with one user doesnt affect the entire community of users. Unix, VMS and mainframe operating systems, such as MVS, are examples of multi-user operating systems. Examples of most popular operating systems : Windows XP is an operating system produced by Microsoft for use on personal computers, including home and business desktops, laptops, and media centers. It was released in 2001. The name XP is short for eXPerience.[3] Windows XP is the successor to both Windows 2000 Professional and Windows Me, and is the first consumer-oriented operating system produced by Microsoft to be built on the Windows NT kernel and architecture. Windows XP was first released on October 25, 2001, and over 400 million copies were in use in January 2006, according to an estimate in that month by an IDC analyst.[4] It was succeeded by Windows Vista, which was released to volume license customers on November 8, 2006, and worldwide to the general public on January 30, 2007. Direct OEM and retail sales of Windows XP ceased on June 30, 2008. Microsoft continued to sell XP through their System Builders (smaller OEMs who sell assembled computers) program until January 31, 2009.[5][6] XP may continue to be available as these sources run through their inventory or by purchasing Windows Vista Ultimate or Business and then downgrading to Windows XP. MS-DOS MS-DOS is an operating system for x86 based personal computers, which was purchased by Microsoft. It was the most commonly used member of the DOS family of operating systems, and was the main operating system for personal computers during the 1980s[citation needed] and 1990s. It was preceded by M-DOS (also called MIDAS), designed and copyrighted by Microsoft in 1979. MSDOS was written for the Intel 8086 family of microprocessors, particularly the IBM PC and compatibles. It was gradually replaced on consumer desktop computers by operating systems offering a graphical user interface (GUI), in particular by various generations of the Microsoft Windows operating system. MS-DOS developed out of QDOS (Quick and Dirty Operating System), also known as 86-DOS . Several versions were released under different names for different hardware.[3] MS-DOS had eight major versions released before Microsoft stopped development in 2000. Unix UNIX is an operating system which was first developed in the 1960s, and has been under constant development ever since. By operating system, we mean the suite of programs which make the computer work. It is a stable, multi-user, multi-tasking system for servers, desktops and laptops. UNIX systems also have a graphical user interface (GUI) similar to Microsoft Windows which provides an easy to use environment. However, knowledge of UNIX is required for operations which arent covered by a graphical program. The UNIX operating system is made up of three parts; the kernel, the shell and the programs. The kernel of UNIX is the hub of the operating system: it allocates time and memory to programs and handles the filestore and communications in response to system calls. The shell acts as an interface between the user and the kernel. http://en.wikipedia.org/wiki/Operating_system http://www.howstuffworks.com/operating-system.htm/printable

Noncontradiction as a Scientific Modus Operandi :: Science Logic Papers

Noncontradiction as a Scientific Modus Operandi We explicate the view that our ignorance of the nature of the real world R, more so than a lack of ingenuity or sufficient time to have deduced the truth from what is so far known, accounts for the inadequacies of our theories of truth and systems of logic. Because of these inadecuacies, advocacy of substantial correctness of such theories and systems is certainly not right and should be replaced with a perspective of Explorationism which is the broadest possible investigation of potential theories and systems along with the realization that all such theories and systems are partial and tentative. For example, the position of classical logic is clearly untenable from the perspective of explorationism. Due to ignorance regarding R and, consequently, the partial and evidential nature of our knowledge about R, an explorationist foundational logical framework should contain machinery which goes beyond that of classical logic in the direction of allowing for the handling of confirmatory a nd refutatory evidential knowledge. Such a foundational framework (which I call Evidence Logic) is described and analysed in terms of its ability to tolerate substantial evidential conflict while not allowing contraditions. 0. Overview The variegated landscape of theories of truth and systems of logic, wherein each is cogently argued while yet inconclusive, is substantially accounted for by the fact that we just don’t know enough yet about the nature of our universe, let us call it R, to be able to settle on one or the other of these theories and systems as adequate for the representation and processing of our knowledge about R. In this paper firstly we discuss this thesis, that it is primarily our ignorance of R, and not any failure to rigorously construct our theories and systems, that is a fundamental cause of the inadequacies of these theories and systems. Secondly we will delineate a scientific perspective, Explorationism, which, if the thesis first considered is correct, is deserving of advocacy. Finally, we exemplify this perspective by exhibiting a logic, Evidence Logic (EL), which incorporates a broadened concept of negation which (1) provides for the representation and processing of both confirmato ry and refutatory evidential knowledge including the possibility of a generous range of conflicting evidence while yet (2) enforces noncontradiction. 1. The inadequacy of our theories of truth and systems of logic Any survey of the gamut of theories of truth so far constructed makes clear that, while each may be presented cogently, each manages to tell only part of the story.

World’s Reliance on Computers

Computers are used in many different ways; they are used in all sorts of different fields of work and are very important to many different people. Practically anything that you use is made by computers. Today’s modern vehicles and airplanes were are designed on a computer. Our country’s traffic signals are run by a network of computers. In a hospital, most lifesaving machines are run by computers. Space exploration would not have been possible without the help of computers. Most employers today require the use of computers. Most people in this 21st century would be lost if they didn’t have the computer.In the early 1800’s with no computers, the medical field had no cures for life threatening diseases. But now in the 21st century most of the cures we have discovered were created with the aid of computers. Computers our found everywhere, in places such as pharmacies. Where without them they would have a hard time keeping inventory, and managing which medicin e goes to which patient. The votes for elections are counted, it may have been done by hand one day, but that makes them inaccurate and easily tampered with. But with the growing population and security risks it would be unmanageable without computers.As said previously space exploration would not be possible at all without the guidance of computer systems. You got to admit life would truly suck without computers. Many people do not agree at all and argue that we don’t need computers at all to live on. Well they could be right, but they sure do not know what would happen to the economy and the quality of life without them. At one point in time there were computers that were nowhere near as intricate like the ones we have learned to love today. Older computers were not as small as the ones we are used to having on our laps today.In fact the first computer ENIAC (electronic numerical integrator and computer), weighed 30 short tons, was roughly 8 feet by 3 feet by 100 feet, took up 1800 square feet (size of a modern apartment), and consumed 150 kW of power. Now compare that to your Apple MacBook Air. ***Computers changed the world a lot. It helped man step forward into the future. Thanks to computers, space exploration came true, new designs of vehicles and other transportation were made, entertainment became more entertaining, medical science made more cures for diseases, etc. . . The computers impacted our lives in many ways. You may not notice it but they did make life a lot easier. Without computers, the world would be a harder place to live in. Thanks to the computers, everyday life is easier for us. Some people may disagree but most wouldn't. Some people say that computers are taking away man power. That may be true but computers did make the impossible possible. *** In this modern age, most businesses today depend on computers and its comparable equipment. Computers have been the key tool to build a successful business.Business computer users have m any different uses for the computers, such as keeping a database on inventory, or managing client accounts, keeping track of money, and so much more. Laptops are another type of computer which is portable, and can be used anywhere. Many business user like laptops because the allow them to do work while on an airplane, or a train. Business users tend to use applications like Microsoft Office Suite where they can make slideshows with pie-charts and graphs to present information to other people in meetings. Any of the new movies you watch are made with special effects.These special effects are made on the computer; in fact most of the graphics you see have all been enhanced on a computer as well. To the left is a picture from the movie â€Å"Avatar. † Avatar was created by specially made suits attached to computers which then turned movement into animation, and then used high tech texturing and graphics to create these creatures. This wasn't the only movie made with computers. M ovies like Lord of the Rings, Titanic, Fight Club, Star Wars, and many more used computers to make them seem more stimulating and accurate.There are movies that have been entirely made on computers such as Finding Nemo and Despicable Me. Now computers are not only used in motion picture graphics they are even used to create the video games we all love to play. In facts the game console you play your video games on are considered mini computers such as PlayStation, Xbox, and Wii. Without computers you would never experience what it feels like to play Halo! Schools all over the country are starting to need more money to invest in their computer systems.Computers are starting to play a huge role in the education field. They help students create magnificent essays such as this one. Make PowerPoint presentations for their school projects. They can easily find the information they need on the thousands of different databases there are on the internet. Most high schools and colleges are re quiring that you type all of your essays and reports. Teachers also benefit from the use of computers as well. They can use the computer to do attendance, manage grades, and communicate with student outside of class time.Medical technology is the most important use of computers. Computers have helped save countless numbers of lives in the hospitals. All of the hospitals newer equipment is all running on a computer. Right now majority of the computers in the hospital help the hospital keep track of patient data, and they make sure the patient doesn’t have a balance! Scientists use computers to find cures for diseases that need cures like cancer and Alzheimer’s. Some of the cures we have found today would not have been possible without computers.It is astonishing how computers have changed the way we live. Something simple such as purchasing fare for the metro lines needs a computer. Tokens are no longer used today. As a replacement for tokens we now use metro cards. The metro cards store data that made by a computer. Also, online shopping has been very effective in previous few years. For the people who don’t have the time to shop in a store this them to just shop online. It also provides ease around the holiday season when the stores are mobbed. The internet has opened so many doors for the world.Computers are not only a luxury anymore they are now a necessity for businesses, homes, and schools. They have become learning devices, great information organizers for businesses. They have made communication instant. Without computers, we as a nation would not be move forward as fast as we are! If all of the computers in the world were to stop working, we would all be in big trouble. If you think that our society is prepared for a world with no computers, well, Godspeed. The fact is our world would be at a halt and mass chaos would arise. A world without computers, well, it’s unimaginable!

The Most Common Psychological Disorder - 1066 Words

The Most Common Psychological Disorder; Schizophrenia Dakota Landers University of West Georgia Technical College July 3, 2016 Abstract Schizophrenia is a common disorder that effects many people. There are many types of symptoms that cause strange behavior and inability to function in certain situations. Although it is a very commonly diagnosed disorder there is no factual evidence of what causes people to be effected by it. There are people that do genetic testing to look for a certain piece of DNA that they think may be linked to schizophrenia (this hasn’t been proved that they are linked). There are many types of treatments, therapies, and medications that patients can choose from to treat their disorder.†¦show more content†¦Cognition is what keeps us aware of our surroundings, contributes to making good judgements, effects our memory, intelligence, judgement, executive functions, social abilities, and many major functions. Impairments in cognitive abilities make tasks difficult and can lead to disability. 4/5 schizophrenics show cognitive deficits. Most patients take longer to encode information given to them but they do very well with information that they are repeatedly exposed to. Working memory is the most effected cognitive deficit. Working memory is what is the most important factor in encoding information; This is tied directly to verbal encoding as well. Many patients that are effected by executive function deficits have issues with solving skills, handling change, recognition, being able to recognize faces and emotions. (This is social cognition being impaired.) These dysfunctions can cause many issues in socio-occupational life. (Kar, 2016) Positive, negative, and emotional symptoms are all things that many schizophrenics face on a daily basis. Some of the positive symptoms that they experience include – Hallucinations, movement disorders, delusions, and thought disorders. Some of the negative symptoms are – algoia (reduced speech output), asociality (lacking interest in social activities), anhedonia (lessened pleasure from activities), avolition (d iminished motivation in activities that are self-induced). These are all things that make everyday life incredibly hard to manage.