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AS and A Level: Computer Science

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  • Marked by Teachers essays 11
  • Peer Reviewed essays 10
  1. Explain how different types of graphic images relate to file formats

    Lossy compression BMP is also known as Bitmap images can be used for storing raw image data, although it has now been replaced with PNG which offers greater compression and is also lossless. * Easy to create from existing files * Pixel values may be modified individually or as large groups * Supported by virtually every device * Does not degrade when saved multiple times like JPEG does * Very large file size * do not scale very well * Lacks all the other features of the other formats GIF images are typically used for line art with limited colours and images with large flat areas of colour.

    • Word count: 617
  2. Evaluate the impact of evolving output mediums on the design and creation of graphic images

    Phones of today can be described as a playground for graphic image editing because they allow images to be edited to look more attractive and more appealing and fun. The downfall for to Mobile Phone in correlation to graphic imaging is that the file of phone manipulated images are very small which you have to take into consideration whilst considering graphical image editing on your phone; it may be small on a computer surface not only that if you

    • Word count: 1377
  3. Describe the hardware and software used to create and edit graphic images and compare the limitations of different hardware and software packages used.

    The higher you set your resolution, the smaller your icons and text, and your refresh rate drops. This may be a big limitation to graphic designers who want to make high quality graphics. Also graphics cards can also cost thousands of pounds, require a lot of space and draw a lot of power from the power supply. RAM RAM stands for random access memory, a type of computer memory that can be accessed randomly. This means that any byte of memory can be accessed without touching the preceding bytes. RAM is the most common type of memory found in computers and other devices, such as printers. RAM is used to hold the running software and graphic images.

    • Word count: 2959
  4. Discuss the impact that file format, compression techniques, image resolution and colour depth have on file size and image quality.

    The fundamental disadvantage of the BMP file format is that the bigger the resolution the bigger the real document itself, so to have the picture in a high resolution it will take up a lot of space. The second drawback of this arrangement is that when you expand the picture the picture quality reduces, this is called pixilation. Representation Interchange Format The Graphics Interchange Format (GIF) is a bitmap image format that is utilised a considerable amount for pictures on the web since it is ideal to use due to support, compatibility and is not too large in space and doesn?t take a long time to upload to be used on Web Pages.

    • Word count: 1607
  5. Explain the purpose of different software utilities

    And threats like key loggers could gain private information. Therefore, anti-virus software prevents harm to the computer making it perform less efficient and protects private information. Disk clean up can help find unused files that can be deleted. It gives you the option to safely remove the unused files to help improve the performance of the computer by making it run faster or frees spaces so that more used files can be saved. If the computer has a lack of space it will slow down the computer.

    • Word count: 973
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    • Word count: 417
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As an industry IT is a significant employer worldwide and Computing is a key foundation in pursuing a related career. At A level Computing involves the study of a range of topics, from memory and storage to how microprocessors work, from systems architecture to programming and logic. There is a distinctive practical programming element to the course and you may be creating apps, websites or other types of creative coding solutions.

Whilst part of the course will be practically examined the majority will be assessed in examinations. You can gain valuable skills by accessing the Marked by Teachers Computing section which contains a wide variety of essay examples to help you master the essay skills required.

Computing does tend to sit well with Maths and Further Maths as other A level optionsbut Economics and Physics are also favoured subject combinations. As a successful Computing Alevel student you'll find your qualification highly favoured by Computer Science departments at University.

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Conclusion analysis

Good conclusions usually refer back to the question or title and address it directly - for example by using key words from the title.
How well do you think these conclusions address the title or question? Answering these questions should help you find out.

  1. Do they use key words from the title or question?
  2. Do they answer the question directly?
  3. Can you work out the question or title just by reading the conclusion?
  • Neurophysiology - Discuss the roles of development learning and evolution in the construction of the nervous system

    "Conclusions The roles played by each factor described here each have their own specific effect on the construction of the nervous system. The evolutionary aspect controls the "blueprints" of the nervous systems that are hard coded into the DNA of the animal. However it is not specifically the genetic makeup of the nervous system that natural selection acts against, rather the phenotype of the nervous system, which is the combination of the developmental and the learning factors. The evolutionary factors alter the genotype, the only source of variation that can be passed down to their offspring. The development can only attempt to recreate the layout as specified by the different alleles; it cannot exceed them in terms of functionality. The true source of variation depends on the extrinsic information obtained and stored in memory, but that us not able to cross generations (with the exception of tradition) and so could be an explanation for the high evolutionary conservation of the nervous system."

  • Discuss the roles of development learning and evolution in the construction of the nervous system

    "Conclusions The roles played by each factor described here each have their own specific effect on the construction of the nervous system. The evolutionary aspect controls the "blueprints" of the nervous systems that are hard coded into the DNA of the animal. However it is not specifically the genetic makeup of the nervous system that natural selection acts against, rather the phenotype of the nervous system, which is the combination of the developmental and the learning factors. The evolutionary factors alter the genotype, the only source of variation that can be passed down to their offspring. The development can only attempt to recreate the layout as specified by the different alleles; it cannot exceed them in terms of functionality. The true source of variation depends on the extrinsic information obtained and stored in memory, but that us not able to cross generations (with the exception of tradition) and so could be an explanation for the high evolutionary conservation of the nervous system."

  • Discuss the relationship that exists in the UK between the legal rules that govern directors' duties and principles of corporate governance.

    "The UK's approach to governance is a self regulatory approach unlike the US legislative approach. Brussels have looked into creating a European corporate governance code however they came to the conclusion it was not necessary and agreed that the European Union should create a common approach which would coordinate national corporate governance codes. If legislation is brought in it would defeat the point of corporate governance as it would cause restrictions on a company rather than the flexibility provided by The Combined Code. It is said that companies who follow a code of corporate governance have a more stable price/earnings ratio this is due to the management of their financial assets, the code helps them manage their assets more efficiently and so they are seen as more stable companies in which to invest. This in turn creates a confidence in investors who are willing to support the development of their company as they have faith in their investment due to the guidelines the company follows set by The Combined Code."

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