Description and Examples of Variables

Description and Examples of Variables A variable is a name for a place in the computers memory where you store some data. Imagine a very large warehouse with lots of storage bays, tables, shelves, special rooms etc. These are all places where you can store something. Lets imagine we have a crate of beer in the warehouse. Where exactly is it located? We wouldnt say that it is stored 31 2 from the west wall and 27 8 from the north wall. In programming terms we also wouldnt say that my total salary paid this year is stored in four bytes starting at location 123,476,542,732 in RAM. Data in a PC The computer will place variables in different locations each time our program is run. However, our program knows exactly where the data is located. We do this by creating a variable to refer to it and then let the compiler handle all the messy details about where it is actually located. It is far more important to us to know what type of data we will be storing in the location. In our warehouse, our crate might be in section 5 of shelf 3 in the drinks area. In the PC, the program will know exactly where its variables are located. Variables Are Temporary They exist just as long as they are needed and are then disposed of. Another analogy is that variables are like numbers in a calculator. As soon as you hit the clear or power off buttons, the display numbers are lost. How Big Is a Variable As big as is needed and no more. The smallest a variable can be is one bit and the largest is millions of bytes. Current processors handle data in chunks of 4 or 8 bytes at a time (32 and 64 bit CPUs), so the bigger the variable, the longer it will take to read or write it. The size of the variable depends on its type. What Is a Variable Type? In modern programming languages, variables are declared to be of a type. Apart from numbers, the CPU does not make any kind of distinction between the data in its memory. It treats it as a collection of bytes. Modern CPUs (apart from those in mobile phones) can usually handle both integer and floating point arithmetic in hardware. The compiler has to generate different machine code instructions for each type, so knowing what the type of variable helps it generate optimal code. What Types of Data Can a Variable Hold? The fundamental types are these four. Integers (both signed and unsigned) 1,2,4 or 8 bytes in size. Usually referred to as ints.Floating Point Numbers up to 8 bytes in size.Bytes. These are organized in 4s or 8s (32 or 64 bits) and read in and out of the CPUs registers.Text strings, up to billions of bytes in size. CPUs have special instructions for searching through large blocks of bytes in memory. This is very handy for text operations. There is also a general variable type, often used in scripting languages. Variant - This can hold any type but is slower to use. Example of Data Types Arrays of types- single dimension like drawers in a cabinet, two-dimensional like post office sorting boxes or three dimensional like a pile of beer crates. There can be any number of dimensions, up to the limits of the compiler.Enums which are a restricted subset of integers.  Read about  what is an enum is.Structs are a composite variable where several variables are lumped together in one big variable.Streams provide a way to manage files. Theyre a form of a string.Objects, are like structs but with much more sophisticated data handling. Where are Variables Stored? In memory but in different ways, depending on how they are used. Globally. All parts of the program can access and change the value. This is how older languages like Basic and Fortran used to handle data and it is not considered a good thing. Modern languages tend to discourage global storage though it is still possible.On the Heap. This is the name for the main area used. In C and C, access to this is via pointer variables.On the Stack. The stack is a block of memory that is used to store parameters passed into functions, and variables that exist local to functions. Conclusion Variables are essential to procedural programming, but it is important not to get too hung up on the underlying implementation unless you are doing systems programming or writing applications that have to run in a small amount of RAM. Our rules regarding variables: Unless you are tight on ram or have large arrays, stick with ints rather than a byte (8 bits) or short int (16 bits). Especially on 32 Bit CPUs, there is an extra delay penalty in accessing less than 32 bits.Use floats instead of doubles unless you need the precision.Avoid variants unless really necessary. They are slower.

RESPONSIBLE RESEARCHER Essay Example | Topics and Well Written Essays - 1000 words

RESPONSIBLE RESEARCHER - Essay Example Another set of motivations deals with pressures that students claim to be under, some of which may be real and others of which may be rationalizations for dishonesty, but all of which shift the responsibility for their behavior away from themselves. I realize my responsibility in delivering authentic papers and will not try to place other person's success or failure on me. I am positive that it will not bring any genuine realization to myself, but rather will show me in a different light, present me as a person with different qualities and talents. I now realize that academic dishonesty might be the first step to dishonest behavior in gradually all areas in life that will sooner or later lead to failure. The next factor of academic dishonesty that I would like to note is a pressures and overloads during academic years. These factor along with improper explanation of the material are often results of academic cheating. There were times when I had to work during my studies and thus sometimes failed the courses, however I have never plagiarized or conducted any other unacceptable behavior. I have learnt to manage stress and meet the deadline and have realized that this, along with honesty and clearness of education goals is guarantee of success. While my education, I am going to divide my time effectively and make it possible to accommodate my work to studies and not conversely. That, by means, effective time management: devoting a reasonable part of time on involvement in Campus life when making studies of academic subjects and keeping the excellent academic performnce the bsic priority. ccording to recent sttistics, provided in research by Philip Langlais, proportion of college students who chet t some point in their creers rnge from low of 25% to high of 80%, but the most common estimte is bout hlf. Not ll of these, of course, re hbitul cheters; mny students chet only under wht they regrd s extreme circumstnces nd my chet only "two or three times in their whole creers." Some students claim that cheating is a means of "balancing the books, " as it were, with professors whom they perceive to be acting unfairly, such as requiring too heavy a work load, giving tests that are too difficult, and grading too harshly. Some students admit to a lack of effort-not attending class, not wanting to do the work-as a reason for their academic dishonesty. Other students claim that, as it were, "the devil made me do it": They say they gave into an irresistible temptation when an opportunity to cheat arose. Still others see cheating as a game or contest of wits between themselves and their professors. Finally, students say that facilitation of academic dishonesty is motivated by adherence to loyalties outside the

Managing in a global context Essay Example | Topics and Well Written Essays - 3500 words

Managing in a global context - Essay Example Fashions diffuse from region to another without encountering any barrier. On the political context, globalization has yielded democratic governance hence increasing citizens’ participation, as well as good governance. One of the most outstanding impacts of globalization in relation to economic aspects is its effects on the automobile industry. For the past three decades, the world has realized a revolution in the automobile industry in terms of production, purchase, use, and repair among others. There is a change in the way people access motor vehicles today compared to previous years when production and purchasing were pegged on certain parameters such as location and prices. Today, the production of the automobile takes place in nearly every developed nation. People no longer look to the East for the production, but most countries produce motor vehicles. Similarly, it has changed and influenced the automobile industry in the developing nations as well as the marketing strate gies. The rest of the paper will discuss the influence of globalization on markets and marketing strategies, global production and supply chain, current developments and key players among other issues. Globalization has greatly influenced the markets and marketing strategies of major players in the automobile industry. The major players include General Motors (GM), Toyota, Ford, Honda, BMW, Chrysler, and Volkswagen (Sturgeon 2009). All these key players operate in the global marketplace and compete fiercely for market share. The process of globalization has eased the production of vehicles due to increased sales. For instance, globalization promoted the establishment of overseas facilities and merger opportunities between giant automobile makers. This has led to increased production as well as marketing. The process of globalization has facilitated the key players to market their brands as well as to tailor the

Binary Phase Shift Keying BPSK Modulation Demodulation Computer Science Essay

Binary Phase Shift Keying BPSK Modulation Demodulation Computer Science Essay This experiment is based on the Binary Phase Shift Keying (BPSK) modulation/demodulation technique. The aim of the experiment is to gain familiarity with the components of a simple data transmission system, gain experience using an experimental communication system and studying its performance under the influence of white noise and also, to compare experimental results with theoretical deductions. Bandpass modulation, of which BPSK is a type, is a process whereby, a sinusoid usually called a carrier wave, is modulated or have its characteristics changed by a digital pulse baseband signal in other to enable wireless based transmission. In BPSK modulation, the phase of the carrier waveform is shifted to either 0Â ° or 180Â ° by the modulating data signal. To effectively model the transmission channel, the AWGN generator is used which adds the effect of noise to the signal at the receiver in other to properly characterise what obtains in real systems. SNR measurements are taken after the noise is added before the receiver and results of each stage of the experiment are presented. 2.0 RESULTS AND DISCUSSION The results obtained from the experiment and brief discussions are now presented. 2.1 The frequency of the waveform was measured to be 1.493kHz 2.2 The amplitude of the waveform was measured to be 3.608V 2.3 C:Documents and SettingsAGEBNIGADesktopLAB RESULTSPart 2.bmp Fig. 1: Square Waveform from NE555 timer circuit. The timer circuit produces a sequence of ones and zeros which together with the resistors and capacitor, produces a square waveform. It can be observed that the square top and bottom are not perfectly straight but with ripples, this is due to the resonance effect presented by the capacitor. Also, the rising pattern of the top is due to the voltage rise time in the capacitor. 2.4 The frequency of the message sequence is measured to be 374Hz 2.5 C:Documents and SettingsAGEBNIGALocal SettingsTemporary Internet FilesContent.WordPart 4 5.bmp Fig. 2: Message sequence at the output of the frequency divider. The SN74LS74 integrated circuit implements a second order frequency divider, 2n (n=2). Hence the frequency of the timer circuit is divided by four. Hence, this is also evident in the frequency of the message sequence in 2.4 above. 2.6 The cut-off frequency of the 2nd order Butterworth low pass filter is given by; The cut-off frequency is the frequency at which the magnitude of the transfer function drops to 0.7071 of its maximum value which represents the point at which the power in the circuit is 3dB less than the maximum value. 2.7 The frequency of the sinusoid at the output of the filter was measured to be 1.328kHz. 2.8 C:Documents and SettingsAGEBNIGALocal SettingsTemporary Internet FilesContent.Wordpart 8.jpg Fig. 3: Output of the first and second Butterworth LPF. A B A Output of first filter; B Output of second filter The Butterworth lowpass filter is used to generate the sinusoidal carrier required for the baseband signal. The Butterworth filter has a gentle roll-off, has no ripple in the pass or stop band hence, it has a monotonic response. To maximise the smoothness of the sinusoid, we use two of such filters in series. 2.9 The RC highpass filter is used to remove the DC components of the sinusoid (since it will only allow frequencies from the cut off frequency upwards) and convert it into a non-return to zero one. The cut-off frequency is given by: 2.10 The frequency of the modulated signal was measured to be 1.408kHz. 2.11 C:Documents and SettingsAGEBNIGALocal SettingsTemporary Internet FilesContent.WordPart 11.bmp Fig. 4: Output of the RC filter and the inverting amplifier circuits. A B A RC filter output B Inverting amplifier output The outputs of the RC filter and the inverting amplifier differ by a phase shift of 180Â °, to fulfil the requirement for BPSK where we need antipodal modulated signals. Since the gain of the inverting amplifier is unity, there is no change to the amplitude of the inverted carrier. 2.12 C:Documents and SettingsAGEBNIGALocal SettingsTemporary Internet FilesContent.WordPart 10 12.bmp Fig. 5: BPSK signal at the output of the adder circuit. A The analogue switch produces a 0Â ° shifted sinusoid when the message signal is high (a 1) and a 180Â ° shifted sinusoid when the message signal is low (a 0). The two outputs streams are combined in the adder circuit which has a gain of unity so that no modification is made to the signal amplitude. The result of this is a stream of 1s and 0s represented by the sinusoidal waveform in fig. 5 above. Point A depicts the sudden phase change as the bits changes to connote a transition from a high to a low and vice-versa. If we begin with a 1, then the fig. 4 would represent 10101010. 2.13 The bandwidth of the noise signal is 500kHz. 2.14 C:Documents and SettingsAGEBNIGALocal SettingsTemporary Internet FilesContent.WordPart 14.jpg Fig. 6: BPSK signal with white noise. The AWGN channel helps to simulate what can typically obtain in real communication environments and it was observed that in real systems, the signal is not really as elegant as presented in fig. 5 but the addition of noise means the receiver will require some form of intelligence and signal processing in other to correctly detect the transmitted message. 2.15C:Documents and SettingsAGEBNIGALocal SettingsTemporary Internet FilesContent.WordPart 15.jpg Fig. 7: BPSK noisy signal at output of RC lowpass filter. The cut-off frequency of this filter is given by; hence it will cut off signals above 15.92kHz. It was observed that after the application of this filter, the noise level was significantly reduced as evident comparing fig. 6 and 7, since the noise contained a large amount of frequency components higher than 15.92kHz due to its bandwidth of 500kHz. 2.16 The signal at the output of the integrator takes the shape of a sawtooth waveform. This is because integrating a square waveform produces a sawtooth waveform. 2.17 C:Documents and SettingsAGEBNIGALocal SettingsTemporary Internet FilesContent.WordPart 16 17.bmp Fig. 8: Output of the integrator circuit. A B The multiplier and integrator circuit represents a matched filter implementation at the receiver. Point A represents the zero point i.e the beginning of a new symbol or bit in this case, when the integrator is re-set. As such, when a 1 changes to a 0, we have a re-set to zero point and the direction of the triangular shape changes to the opposite. Point B is the integration phase proper. It is not smooth due to the effect of noise in the system. Also, the rise is a direct result of the capacitor charging. 2.18 C:Documents and SettingsAGEBNIGALocal SettingsTemporary Internet FilesContent.WordPart 18.jpg Fig. 9: Pulse application to integrator. A B A Integrator output; B Reset Pulse As displayed on fig. 8 above, the reset pulse is applied to the integrator at the symbol transition instant which is seen to be the beginning of every half cycle to reset the integrator to zero. 2.19 C:Documents and SettingsAGEBNIGALocal SettingsTemporary Internet FilesContent.WordPart 19a.png Fig. 10: The Reference Signal C:Documents and SettingsAGEBNIGALocal SettingsTemporary Internet FilesContent.Word19b.jpg Fig. 11: The Sampling Pulse C:Documents and SettingsAGEBNIGALocal SettingsTemporary Internet FilesContent.WordPart 19c.jpg Fig. 12: The Reset Pulse The reference signal is obtained from the SN74LS74 frequency divider of the transmitter thus it is the originally transmitted message sequence. The sampling and reset instances are done at the same time that is at the half cycle. 2.20 C:Documents and SettingsAGEBNIGALocal SettingsTemporary Internet FilesContent.WordPart 20.jpg Fig. 13: Output of the Comparator. This is where the original baseband signal is regenerated. From fig. 8, when the output of the integrator is positive, an output voltage of 5 volts is produced at the comparator and when the integrator output is negative, a 0 volt output is obtained. This resulted in fig. 13 above showing the alternating 5 and 0 volts or 1s and 0s which depicts our detected signal. The frequency of the detected signal is 1.419kHz. 2.21 The length of the delayed version of the data symbol produced at the receiver is 1.804ms 2.22 C:Documents and SettingsAGEBNIGALocal SettingsTemporary Internet FilesContent.WordPart 21 and 22 Greeen channel 2 yellow channel 1.bmp Fig. 14: The Delayed pulse and Original data signal. A B A- Delayed Pulse; B Original Pulse Comparing the original data signal against the delayed version, it is observed that though they are of the same period, B has longer duration positive half cycle while A compensates with a longer negative half cycle. Also, the time delay between them is about a half cycle. 2.23 C:Documents and SettingsAGEBNIGALocal SettingsTemporary Internet FilesContent.WordPart 23 yellow delay green comparator.bmp Fig. 15: Input Signals to the XOR circuit. A B A Delayed original signal; B Detected signal The detected signal B is compared against the delayed version of the original signal A, because B generally, B would have experienced some delay and hence to effectively ascertain if an error occurred, its best to compare it against a delayed original as represented by A. The exclusivity of the circuit lies in the fact that when A B are the same, a 0 will be produced while when they are different denoting an error, a 1 will be produced. 2.24 C:Documents and SettingsAGEBNIGALocal SettingsTemporary Internet FilesContent.WordPart 24 green 2 yellow 1.jpgFig. 16: Input Signals to the first NAND gate. A B A Sampling Pulse; B XOR Output A NAND gate will only produce a zero when both inputs are high. Hence a zero is obtained when the sampling instant coincides with a high output from the XOR circuit. 2.25 C:Documents and SettingsAGEBNIGALocal SettingsTemporary Internet FilesContent.WordPart 25 yellow chn1 5v dc green chn2 1st input.png Fig. 17: Input Signals to the second NAND gate. A B C A Input 5Vdc; B Output of first NAND gate; C Zero point Since a NAND gate will produce a high when both inputs are not the same and when they are both 0, a 5V dc (always high or 1) is applied to one of the inputs and the output of the first NAND gate to the other. Hence, at the points where B comes down to zero (C), the output of the NAND gate will record a high which implies an error has occurred. 2.26 To estimate the BER; Where Vs (rms value of signal amplitude) =514mV, Vn (rms value of noise amplitude) = 0-10dB W (AWGN channel bandwidth) = 500kHz T (modulated Signal period) = 656.25ÃŽÂ ¼s SNR received signal to noise ratio BER bit error rate or error probability. Table 1 below presents the values. Table 1: Summary of Results Fig. 18: BER Performance Plot 3.0 CONCLUSION The BER performance plot of fig. 18 shows that the behaviour of the experimental system is within the bounds of predicted theoretical results. For instance, as quoted in the lecture notes, at SNR= 10.4dB, the BER is about 1.510-6. From fig.18 above, a similar point, of SNR=10.3806dB gives a BER of 1.48810-6. Hence confirming the accuracy of the results obtained from the experiment. The plot confirms that as the signal-to-noise ratio increases, the error probability reduces in line with conventional knowledge. In addition, the process of using a baseband signal to modulate the phase of a sinusoid was observed, converting it into a bandpass signal for transmission ease. Also, the use of Additive White Gaussian Noise to simulate the channel provides an insight into what might be expected in a live system environment, under varying degrees of noise exposure. Finally, because the received data sequence will most likely be displaced from its true positions as demonstrated experimentally, the use of a time delayed version of the original transmitted sequence to compare and check for errors was justified.

Bronfenbrenner’s Ecological Systems Theory

Bronfenbrenner’s Ecological Systems Theory According to Bronfenbrenner’s Ecological Systems Theory, microsystem refers to the groups that immediately influence and directly impact the development of a child. In my life this impact came from my family and church. As a young child I was very timid and shy. My family taught me how to be resilient in challenging situations. For example during large family gatherings, where confrontations occur among my cousins and I, there were several opportunities to voice my opinion and stand for what I feel was right.The church I attended gave me a different paradigm on life. Being a part of this ministry allowed me to see my potential on a greater level. Over the years, I was given many chances to interact with children in a supervisory position. This experience helped me to discover my gift for teaching young children. Exosystem is the link between a social setting in which the individual does not have an active role. Being a military family, exosystem, also had a strong influence on my development as a child.My step father was enlisted in the US Navy. At the age of eight years old, my family and I relocated to Virginia from Florida. We resided here for 4 years. During my time in Virginia, I discovered that school was more challenging than that of Florida schools. I struggled academically, especially the first two years. The academic lessons are a little more than a year worth of difference between the two school systems. So the two systems that impact me the most are the microsystem of my family and the exosystem of being a military family.Nurture and Nature does have an influence on adult development, but not as great as it is on children. Let’s look at nurture, as a child you are still developing. A child has minimal control over his or her environment and development has not reached maturation, that’s why children need adult supervision and guidance. Once a child becomes a mature functioning ad ult he or she can make sound decisions what is accepted in his or her environment. For example, Victor does not enjoy the city that he resides in. There are not a lot of opportunities for the career field he is working in.Victor can make a conscious decision to move to a more suitable location. A minor has very little influence on where he or she lives. With the latest advancements in science we are fortunate to have the knowledge to counteract the negative effects of genetics. Nature influence on our quality of life is weakening. Maria’s family has a history of heart failure and diabetes. Maria’s, physical make up is that of her biological father. She is petite and pear shaped. Her paternal great grandmother, great aunt and grandmother died from complications of heart disease.Maria has control over the foods she eats and activity levels. On the other hand, children foods and playtimes are decided by consenting adults. Through proper education and a healthy lifestyle s he has a better chance of a life free of this illness. Even though nurture and nature have a minimum influence on adults, ultimately adults make the final decisions on their lives. Choose Wisely. 1. Witt, G. A. , & Mossler, R. A. (2010). Adult Development and Life Assessment. Retrieved from https://content. ashford. edu/books/AUPSY202. 10. 2

Robert Wilde - ThoughtCo

The Media and Control - 1219 Words

Reality for most people, is what they â€Å"assume exists independently of any concept or representation†. (Grossberg, 1998:184) That’s â€Å"reality† to us, no second thought about it. Fiske says that reality â€Å"is the product of that culture’s codes†; (1987:4) meaning, that our society presents us with â€Å"a collection of material facts, that we can accurately perceive†. (Grossberg, 1998:185) The concept that the material facts have to be collected is peculiar. It implies that a negotiation between the public and reality has taken place, that someone, had to decide what was to be collected, and what was to be deserted. It has been said that media is the most influential. The media are â€Å"perhaps the most important producers of meaning and the codes of†¦show more content†¦Our society is divided into many individual groups according to the media.   For example, the media portrays black males either as basketball players, drug dealers, and murderers. They are mostly badly characterised, however all of the above does not represent just black males, it represents just about any human being. Also, there is Barack Obama, challenging the stereotypes set by the media. The Cultivation Theory suggest that the typical viewer is isolated and atomized, thus highly influenceable by the media. For example, too much media violence makes the viewers perceive our society as a mean, scary and dangerous place when it is not. And in consequence, citizens respond by supporting conservative crime control agendas excessively. In result there have been massive buildups in jails and prisons. Gerbner says that heavy viewers have a greater fear of our society in comparison to light viewers. Like I have mentioned that certain ideas and images can shape and distort our perceptions of reality. How many naked bodies do most of us view on a regular basis in real life - not counting what the media shows us?! Very few. But now-a-days people spend a lot of time reading fashion magazines and watching pornography, they encounter more naked or semi-naked bodies than they would otherwise, such as female bodies that happen to have had plastic-surgeries and men that are well toned. It is not surprising that in our media-driven society, ourShow MoreRelatedDo We Control The Media Control Us?889 Words   |  4 Pages111 27 August 2014 Do we Control the Media or Does the Media Control Us? Imagine how surveys came into play. Imagine a group of people wanting to know what another group of people think, feel, want and desire. A survey came to be a way to meet the needs of others at a much more efficient way. Imagine mass media as a way to meet the needs and desires of the mass. It is a survey taken every time the remote is used. 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