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Friday, 09 May 2014 17:23

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Parallel Computing


Assignment 1

Parallel computing is referred to as the use of two or more processors in combination in solving a single problem (Stout 2013, Para 4). According to Barney, 2013, Para 3, parallel computing is defined as the simultaneous use of multiple compute resources in solving a computation problem where a problem is broken down into discrete parts, which can be solved concurrently. Willmore 2012, Para 3, describes parallel computing as the use of multiple processors or using computers that are working together on common tasks. According to the definition, each of the processors work on its section of problems and processors can be able to exchange information. With parallel computing, it usually allows one to solve problems which cannot be solved in a reasonable time and also those problems that do not fit in a single CPU.  


LSU 2012, p 1 describes parallel computing as a computing method which may be performed by systems that contain two or more processors which are operating simultaneously. This is a computing method where all the processors work on different aspects of the same program in the same time so that to share a computational load. According to Fountain 1994 p 28, parallel computing is concerned with matching the structure of the computer to the part of the problem which requires to be solved. Parallel computing is referred to as the emphasis on using several processing elements or processors with the objective of gaining the speed in performing time consuming computing job (Bhujade, 2004 p 3). The objective of this process is to effect continued progress of all the tasks through sharing resources in a manner that is orderly. All computers are parallel, and iPhone 4S tend to have two cores.


Assignment 2

Time division multiple assesses were being used in cell phone system to carry three conversations on a single frequency derived channel (Tyson, Layton, & Brain, 2013, Para 3).CDMA tend to use chip code in encoding individual cell phone conversation Mohiuddin, & Shahid 2011, Para 20. The authors state that the conversation chips are using encoding and also translating the outgoing and incoming signals.


Code division multiple access is a cell telephone transmission that uses spread spectrum transmission. According to (Poole 2013, Para 13), CDMA is based on the use of direct sequence spread spectrum techniques. It is a form of spread spectrum transmission that uses spreading code in spreading of codes so that to spread the signal out over a wide bandwidth than it would be required.GSM tend to have a complex security as they are based on technologies which are almost similar to TDMA and they tend to operate in high frequency (SANS Institute, 2001 p 6).


Personal communication is a set of wireless communication abilities which allow combination of personal mobility and terminal mobility. PCS services are usually provided in the 1900MHz band. CDMA is a channel access method which is used by most of the communication technologies.During a conversation with WTLS, it tends not to be compatible with SSL; therefore, it is necessary for WTLS messages to be converted to SSL before any e-commerce site. Conversation tends to occur away from the network gateway, and this makes information be vulnerable to attack (Jensia, I 2008 Para 6).


Reference

Jensia, I (2008). Wireless security issues retrieved from http://voices.yahoo.com/wireless-security-issues-2114600.html?cat=15

Barney, B (2013). Introduction to parallel computing retrieved from https://computing.llnl.gov/tutorials/parallel_comp/

Stout Q (2013). What is parallel computing retrieved from http://web.eecs.umich.edu/~qstout/parallel.html

Tyson J, Layton J, & Brain M, (2013). How cell phone works retrieved from http://electronics.howstuffworks.com/cell-phone2.htm

Mohiuddin W, & Shahid B (2011) Dance of wireless triggered lights retrieved from http://www.mat.ucsb.edu/~g.legrady/academic/courses/03w200a/projects/wireless/index.htm

Synder, G & Pordoe, T (2005). Network security Cengage learning

Poole I (2013). CDMA spread spectrum basics retrieved from http://www.radio-electronics.com/info/rf-technology-design/cdma/cdma-spread-spectrum.php


 

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