The History Of The Device Drivers Information Technology Essay

The History Of The Device Drivers Information Technology Essay In the Windows operating system, device drivers are fairly easy to understand and operate. The feature of Windows update makes installing device drivers simple and very user friendly. By default, Windows has a wide range of drivers already stored in the kernel that holds the foundation for device drivers. This list of drivers gets updated with every operating system release (Windows XP, Windows Vista, Windows ) and with every service pack Windows puts out along with them (Windows XP Service Pack 1 and 2). Device drivers can work in two different modes in the Windows platform, kernel-mode and user-mode. Both have their advantages and disadvantages between the different modes. The biggest difference between the modes is the stability and performance speed. In kernel mode, there are no restrictions in access to the hardware and run faster than in user mode. This is because the driver communicates with the hardware directly in kernel mode rather than accessing the hardware using its corresponding API (Application Programming Interface) like in user mode. The downfall to kernel mode is when the device driver crashes; the computer will immediately crash as well. In user mode, the drivers do not have direct access to the hardware; instead, they rely on the devices API to delegate hardware access. While user mode device drivers operate at slower speeds than kernel mode drivers, a major advantage to user mode device drivers is that it is very crash tolerant. When the device driver crashes in u ser mode, it is always recoverable. Most modern device drivers operate in user mode except for video card drivers (most of the code needs to be kernel mode for top performance). The top two video card manufacturers in the industry right now are Nvidia and ATI. Both require separate drivers from their corresponding manufacturers. In a typical installation of an Nvidia video card driver, the driver come with mostly kernel mode code and a small amount of user mode code as well. The Nvidia Control Panel (after an Nvidia driver installation) is an example of the user mode code that Nvidia incorporates into their drivers. These drivers from the manufacturer are called, official drivers. There are other drivers out there for these manufacturers called, unofficial drivers. The most commonly known unofficial driver creator is known as Omega Drivers which, as described by their site, add more options to the drivers such as added resolutions. These drivers are marked as unofficial because they have not been approved by the manufacturers and it is recommended to use them at the users own risk. Sound drivers are required to provide the output of sound from your computer. Like video cards, there are two locations that a sound card can be. One place is called onboard sound, which is provided by the motherboard. This is most common location of sounds cards for laptops. The other location may be found on a PCI card slot, which is typically found on the back of a desktop computer. Popular onboard sound drivers and manufacturers are Realtek and SigmaTel. Popular PCI slot sound drivers and manufacturers are Creative Sound Blaster, Turtle Beach and ASUS. Unofficial drivers are also available online for these audio drivers. Network drivers are required for any kind of wireless or wired (Ethernet connected) device. For laptops, a wireless card typically comes standard. For desktops, a wireless PCI slot card or a wireless USB is required to get wireless connectivity. Most modern motherboards for laptops and desktops provide wired connectivity by manufacturers standards. Both the wireless and wired cards use completely separate drivers. In most cases, the wireless and wired cards are made by completely different manufacturers. For example, my Dell laptop wireless card is made by Dell and my wired card is made by Marvell Yukon. One of the biggest advantages to Windows 7 is the wide range of bare bone network drivers implemented into the kernel to enable the wireless or wired card to function. In previous Windows versions, such as Windows XP, you could not connect to the internet and get wireless/wired drivers unless you installed them via CD, USB or floppy disk. This problem was a constant annoyance for users upon which Windows 7 fixed. An important aspect of the motherboard that is important to have updated drivers for is the motherboards BIOS as it controls every single piece of hardware on a computer. Having the most recently updated BIOS for your motherboard is very beneficial because it fixes a lot of compatibility issues between the computers hardware devices. While the basic Windows update drivers may be good enough for basic level computer users, the more advanced users like to update to the latest drivers by the manufacturer to provide maximum compatibility and performance out of their devices. Sometimes when installing/updating these device drivers there are problems that can happen. One of the biggest common problems with updating drivers is that most users do not implement a full driver installation. There can be some compatibility problems when updating versions of drivers without properly uninstalling the driver fully and then installing the most updated driver. The reason full driver installation is important is because its less error prone than just to update a driver without uninstalling first. Another common problem is users installing device drivers from the wrong operating system architecture (x86, x64). If a user installs the drivers with the wrong architecture, typically, the installation screen will tell you that it is not compatible. If the installation screen doesnt inform a user, the user will definitely know because their device will no longer work. Therefore it is important to identify what kind of computer architecture your computer is because device drivers run differently on different architectures. Like hot fixes and patches, device drivers also secure your computers privacy by fixing security holes upon with hackers can take control and even disable various devices on a computer system. The security of device drivers and the security of the operating system come hand-in-hand meaning both play an equal role in the security of a computer system. The most security involved device that most computer users are worried about is the network device. Users should recognize that updating network device drivers is just as important as updating a routers firmware.

Trouble with Society :: essays papers

Trouble with Society The most troubling thing in our society today is how children treat each other. We try to teach our children to have high morals so they will be honest and kind when they become older. But how are our children acting when grownups are not around. Kids tend to classify each other by how rich their parents are and how well they dress. To a child who is classified as being poor the ridicule and constant teasing can be overwhelming possibly causing many psychological problems. Kids want a lot of things and as parents we would like to give those things to them. But a lot of the time we can't afford to. With the rising cost of living it is hard for some people to even put food on the table. With the price of designer label clothes being so high many people can only afford to shop at k-mart. To a child fashion is everything if you don't look cool than you will not be accepted by others. You will be teased and made fun of. I remember when I was in elementary school everybody had nike high top sneakers. Although my family was not poor my mother worked hard for her money and she didn't think it was necessary to pay fifty dollars for a pair of shoes I would probably ruin in a couple weeks. Well I was so embarrassed when I had to wear the shoes my mom picked up for me from k-mart's. I remember the other children laughing at me because I had a pair of cheap sneakers on. Children go through a lot growing up have to use their parents morals to battle today's social problems. Many things can effect a child's psychological behavior which in return effects the people around them. Let's look at the situation that occurred at Columbine High School in Colorado, two children who were social outcasts finally had enough of being teased and made fun of went to school and started shooting their peers. Maybe if they weren't teased like they were, for not dressing like everyone else or acting like the others, they would have never built up enough anger to do such a thing to other humans. For a child to have to grow up in a shack of a house with no heat or running water is a tragedy.

Case Study on School Safety

Case Study on School Safety Melissa Rookard EDD 520 January 24, 2010 Leslie Faught It is evident that schools' policies, programs, practices, physical structure, and teachers are factors internal to the school that determine school safety. These are the only factors that are internal to the school and within fairly complete control of schools. It is these factors that can be reformed and adapted to meet the end result of school safety. School safety is also determined to a very large extent by students, their criminal and other behaviors. Students in turn wear the dual hat of external and internal factors. They are external factors because they are part of the community and are internal factors because they are part of the school and can be disciplined to a certain extent through school policies. There was an incident at Horribly Heard Middle School in Dayton, Georgia. A young man names, Bruce, brought a gun to school and was taken into custody by the Dayton Police Department along with the help of the Department Juvenile Justice. There were many key players in locating the student to insure the school safety. A student was shown the gun and reported to his teacher, Mrs. Daisy. Mrs. Daisy in turn contacted her administrator and asked if he could come to the classroom. Mrs. Daisy, team leader, instructed her team to take the students to the library to check out books. Shortly after, they left an announcement came over the intercom that all students and teachers remain in class until told to dismiss. Teachers were instructed to read their e-mail immediately and follow the instructions laid out in the e-mail. All teachers had to take roll and report any missing children to the front office staff. Mrs. Daisy and her team stayed in the library and check their e-mail in the library. Administrator Bob, Principal Hope, and Resource Officer Life, came to the classroom to search Bruce and taken him into custody if the weapon was indeed on him. Two additional administrators stayed in front of the classroom to ensure no one came down the hall. Office Life took Bruce into custody and he was charged with weapons on school grounds. Once Bruce was taken off school grounds school ran as normally as possible. After school and the students were gone, the staff has an emergency faculty meeting. Principal Hope informed the faculty of the incident today and the student would not return back to school. Student was taken into Juvenile Justice Custody and no one was hurt. The student that told the teacher was also spoke to along with his parents in regards to the incident. They asked that he did not repeat was has happen to ensure students safety and parents concern. Students bring weapons to school more times than we are made aware. At HHMS, faculty and administration communicates well as was able to ensure school safety. Having students stay in the classroom or stopping all movements in the hallways is one way to keep order and asking faculty to take roll immediately and report any missing students via e-mail to front office staff is vital. I believe HHMS handle the situation to the best of their ability. School security is the most common type of activity that administrators should specifically set up to prevent disorder in the school. The most prevalent security strategy used throughout HHMS is various ways to monitor student and non-student movement within the school. The staff and administrators were primarily responsible for this task. To avoid a situation other types of security strategies could be used. Examples, are hiring special security personnel, use of metal detectors, and random searches. Schools should have two basic approaches to rules and procedures. The first approach are teachers tend to deal with all but the most serious discipline problems, including setting punishment and calling parents (if necessary). The second approach tends to deal with small infractions within the classroom and then refer students to an administrator for repeated or more serious infractions. The administrator was responsible for assigning punishment and contacting parents. Regardless of the approach, consistency of rule enforcement emerged as an important issue, especially among students. It is the role of the principal in setting the overall tone in a school when it came to discipline and enforcement of rules. School staff expressed more satisfaction if the principal set clear expectations, communicated regularly with staff, and gave them a voice in school issues.

Creating an Analysis Essay on Archeological Record

Creating an Analysis Essay on Archeological Record In our previous guide, we discussed 20 topics for an analysis essay on archaeological record along with a sample essay plus 10 facts on for an analysis essay on the archeological record and genre to provide you with insights into what topics you can write on and how an analysis essay should be written. In this final guide, creating an analysis essay on archaeological record, we discuss the format, methods and tactics which will help you compose a brilliant paper that’s admired by your professors. But before getting into the whatnots of how an analysis essay should be written, you should know that an analytical essay is not a summary. In theory it may be, but in practice, not so much so. In fact, an analysis essay is written in a way that tells a story about a specific subject and not just providing a summary of it. In simple words, you are answering the â€Å"how† of something. For example: how using certain metaphors adds value to poetry, or how certain themes present themselves in a certain story etc. Now let’s get into the nitty-gritty of how an analytical essay is outlined: The Basic Way to Write an Analytical Essay There are a number of handful ways to write an analytical essay. They all aim at doing the same thing, hence the basics remain the same, which are as follows: Introduction Body Conclusion Now let’s discuss all the basics listed above: The Introduction The best way to introduce your analysis to the reader is to ignite interest in reading further. You can do this by doing three things: Get them hooked from the start. Introduce your thesis statement. One or two sentences on how you will prove your thesis statement. How do you get a reader into reading further? It’s really simple: All you have to do is write something interesting and surprising like a rhetorical statement or question, mention a few statistics that are relevant, or maybe   make a controversial statement. Once you have got your reader interested in reading further, you will want to smack an impressive thesis statement right in their faces. To do this, be clear and concise and get to the point straight away. Afterwards, you want the reader to know how you’re going to provide evidence and prove your thesis statement ― be clear and briefly describe what the reader is in for. The Body This is the part where you can play with formatting and show the reader how creative and ingenious you are. However, keep yourself focused on what really matters. Here is what should be included in your body: Include a Strong Topic Sentence To make your writing stand out, interesting and easy to scan, you should include a â€Å"title sentence† right before a paragraph. It should talk about exactly what the paragraph contains which makes it easier for the reader to know what’s coming next. Introduce Your Claim Now it’s time to get your claim in front of the reader. You should break down your primary claim into several pieces, giving evidences for each part to make it more convincing rather than having the reader read the entire paragraph just to buy into your claim. Speaking of evidence; The Evidence You should always know that evidence is what gives weight to your claim. Remember to always include as much relevant information as you can to support your claim. Ensure that whenever you include any evidence, it ties with the title sentence, otherwise it would look more like a summary than an analysis. Finally, use effective transitions to keep your writing flowing seamlessly. Conclusion Once you’ve proven your point by backing it up with evidence and tying that evidence with your standout title sentence and you’re certain that the reader is convinced, it’s time to conclude your essay. What’s the best way to go about it? Briefly restate what you’ve written above and in different words than what you’ve written in the body. You can add a real-world example that correlates with your argument or add a quote, or paraphrased text on what you’ve just talked about. Final Words That’s it! All you need to do now is re-read your essay from a reader’s perspective and eliminate anything that seems out of place. Make sure your paper is free of errors and mistakes so that it looks like the work of a professional. There is no shame in borrowing a little online expertise and guidance. Don’t hesitate to use these guides as a reference in case you need to better polish off your essay. Cheers!

Modular Arithmetics Essays - Algebra, Mathematics, Abstract Algebra

Modular Arithmetics Essays - Algebra, Mathematics, Abstract Algebra Modular Arithmetics MODULAR ARITHMETIC: Modular arithmetic can be used to compute exactly, at low cost, a set of simple computations. These include most geometric predicates, that need to be checked exactly, and especially, the sign of determinants and more general polynomial expressions. Modular arithmetic resides on the Chinese Remainder Theorem, which states that, when computing an integer expression, you only have to compute it modulo several relatively prime integers called the modulis. The true integer value can then be deduced, but also only its sign, in a simple and efficient maner. The main drawback with modular arithmetic is its static nature, because we need to have a bound on the result to be sure that we preserve ourselves from overflows (that can't be detected easily while computing). The smaller this known bound is, the less computations we have to do. We have developped a set of efficient tools to deal with these problems, and we propose a filtered approach, that is, an approximate computation using floating point arithmetic, followed, in the bad case, by a modular computation of the expression of which we know a bound, thanks to the floating point computation we have just done. Theoretical work has been done in common with , , Victor Pan and. See the bibliography for details. At the moment, only the tools to compute without filters are available. The aim is now to build a compiler, that produces exact geometric predicates with the following scheme: filter + modular computation. This approach is not compulsory optimal in all cases, but it has the advantage of simpleness in most geometric tests, because it's general enough. Concerning the implementation, the Modular Package contains routines to compute sign of determinants and polynomial expressions, using modular arithmetic. It is already usable, to compute signs of determinants, in any dimension, with integer entries of less than 53 bits. In the near future, we plan to add a floating point filter before the modular computation. Bibliography Explains basically the definition of modular arithmetic, and contents of it.

Competitive Analysis Essay Example | Topics and Well Written Essays - 1000 words

Competitive Analysis - Essay Example Its cost only includes market research, advertising and promotion hence enabling the company to minimize on the cost of production. On the other hand, bottlers are provided by syrup by the concentrators’ where they then they mix it with sugar, treat with local water and carbonate it. Finally, they bottle it and then deliver it to the retailer. All these activities make the bottling business capital intensive as it requires high technology in production. Returns received by concentrate producers greatly differ from those received by the bottlers due to various reasons. The main factors as indicated in the above paragraph are the financial cost incurred by both companies (Fleisher & Bensoussan, 2007). Bottlers for instance incurs low cost of production as it only concentrates mainly on advertising, market research and product development whereas bottlers activities involve investment of huge amount of capital as its main concern is to archive its main goal of improvement and mod ernization of the bottling lines which as a results requires high amount of capital (Fleisher & Bensoussan, 2007). Secondly, the other cause of variance in returns is the availability of raw materials. The concrete producers require fewer raw materials hence its major spending is on purchase of cheap inputs like citric acid, natural flavors and also caffeine; on the other hand bottlers require large number of production materials. They invest in purchase of inputs such as packaging materials like cans, bottles and also sweeteners such as aspartame which prove to be expensive hence reducing their profitability as they are unable to reduce on the outflow of money (Fleisher & Bensoussan, 2007). The returns received by bottlers are also less than those received by the concentrate producers due to the risk levels each of the company face. Concentrate producers are responsible for the brand promotion and also invest hugely on trademark to stimulate sales; on the other hand, bottlers have little risk in their operations as they already have an advantage i.e. have a famous name which is well known all over the world .This development provide them with stable returns and low risk (Bensoussan & Fleisher, 2008).

Database Systems Concepts Essay Example | Topics and Well Written Essays - 750 words - 2

Database Systems Concepts - Essay Example In addition, RAM is usually much smaller in size, about two to three orders of magnitude being frequent. (A rig that I know of has 8 Gigs of RAM and 2 terabytes of hard drive space, and the owner has room to expand to over 5 terabytes, which is roughly a three order of magnitude difference). Scheduling is almost entirely unnecessary. There is a need to compare the RAM disk and the main memory disk-cache, but this doesn't affect the choice of a scheduling algorithm for the hard drive because they are totally different systems and because scheduling on the RAM disk is only looking for buffer cache misses not main memory requests. Hard-disk scheduling considerations are totally different. Hard disks are much larger and they are not read constantly, and the head positioning must jump in order to handle different reads. The file system does store recently used blocks in a buffer cache in main memory, but this is only a partial time-saving maneuver. Caches have finite sizes and need to be purged constantly; in any respect, no one sticks to only a few things in cache. They are constantly opening up new pages, documents and programs, which requires accessing different parts of the disk. This means that scheduling for hard-disk use is at a premium: Indeed, one of the main slowing forces in Moore's Law exponentiation is the relatively anemic growth of hard-drive scanning speeds versus the memory size of hard drives. Different hard disk scheduling regimes have different benefits. When designing a scheduling algorithm, it is important to bear in mind parameters of functionality. These include power consumption, throughput, response time, flexibility for the end-user, and other factors. Again, the cache can only do so much in mitigating these problems, so the choice of how to approach hard disk scheduling has many inherent tradeoffs. One approach is FCFS, or First Come First Served. In this algorithm, operations are conducted in the order requested. This is very simple and elegant in many ways. However, the problem is that not all functions are made equal: Some functions, like Ctrl-Alt-Delete on a Windows computer or dealing with security threats, need to be scanned first. FCFS therefore doesn't have the costs of reordering the work queue, but it doesn't have the benefits either. FCFS cannot have starvation: Every request is serviced. But the performance is poor: It doesn't distinguish between the importance of needs, nor does it have any smart geography. If a end user wants to run six programs from every different side of the disk, FCFS will go in order, crossing immense redundant space and thus leading to slowdown. SSTF, on the other hand, prioritizes geography of the desk. It goes to the closest location on the disk first, no matter what. Again, this has the problem that there is no discrimination for important tasks. Scan time is reduced, but starvation is possible: The head could stay in one sector of the disk for too long if too many requests co me in. Direction switches also slow things down. SCAN goes from the outside to inside then the inside to outside. This has the advantage of being a uniform pattern and reducing variance, but it does lead to a lot of unnecessary scans (though not more scan time) which can be a power consumption issue. LOOK is a bit smarter: It stops going a direction where no requests exist. C-SCAN and C-LOOK use cylinders instead of a simple directional approach. This has the adv