Computer Science OCR A level H446 Spec. Simplifies teaching by adhering precisely to specification: Detailed, but concise coverage of each section. Great for home-learning & revision. Simple to use.

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However, heat generated by the CPU will increase proportionally with clock speed, so this is only viable for systems with better heat dissipation. This makes them useful as checksums in packet headers, or for validating that a file has been downloaded correctly.

Application data from the above application layer often has large filesizes, such as uploading a 10GB video file, and thus must be split into segments, or TCP packets, and then numbers these sequentially. OCR 2016A Level in Computer A Level Computer Science (from September 2015) iiTeaching and learning resources iiiProfessional development iv1 Why choose an OCR A Level in Computer Science ? Methods of generating real-world randomness include lava lamps (see image below), a double-pendulum system or radioactive decay. For example index 1 of the leftmost half’s first list is compared to index 1 of the rightmost half’s first list and the smallest value is written. If there is not an interrupt at a higher level than the one originally being executed, the CPU then continues with the FDE cycle.During initialisation, due the static nature of queues, their maxSize must be specified during initialisation. Computer Science degrees often combine with other subjects including Maths, Physics, Engineering, Biology, Graphics, Animation. I switched to using lossy compression, and it reduced the file size by 95% at almost no visual quality loss as they are relatively small on the page, especially on mobile devices.

Each element in the queue has a priority associated with it, which can be denoted by having a number or letter when enqueuing.There is a trade off between how heavily the image is compressed (and therefore the smaller the filesize) and the quality. Download the guides at Results a free online results analysis service to help you review the performance of individual students or your whole school.

This shows programmers what must be inputted to the subroutine, and this process can also be continued with the outputs too, minimising ambiguity. Entity relationship diagrams 44 OCR 2016A Level in Computer A Level Computer Science (from September 2015) Computer Science is a practical subject where students can apply the academic principles learned in the classroom to real-world systems. To do this mentally, remember that F is 1111 and 9 is 1001: it is relatively easy to calculate each hex value from these two points. Interrupts can be sent to the CPU by software, hardware devices, drivers, or its own internal clock. Code optimisation removes redundant instructions and replace inefficient code with code that achieves the same result.

Likewise, if there are 10 adjacent pixels in an image with the same colour “00000110”, this could be represented in RLE as 10(00000110).