Module 2 Data Communication Fundamentals Version 2 CSE IIT‚ Kharagpur Lesson 1 Data and Signal Version 2 CSE IIT‚ Kharagpur Specific Instructional Objectives At the end of this lesson the students will be able to: • • • • • • • • • Explain what is data Distinguish between Analog and Digital signal Explain the difference between time and Frequency domain representation of signal Specify the bandwidth of a signal Specify the Sources of impairment Explain Attenuation and Unit of Attenuation
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Computer is an electronic machine or device which is available of receiving information(data) in an unread form and of perfoming a sequence of operations in accordance with a predetermined but variable set of procedural instructions (program) to produce a result in the form of information or signals. Input is a hardware component that allows users to key in or enter data /instruction to a computer.A computer has many types of input devices‚ for example : keyboard‚ pointing devices‚ voice input‚
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discussed and all concluded that data analysis methods help us understand facts‚ observe patterns‚ formulate explanations‚ and try out the hypotheses. Not only does it help us understand facts‚ but they we also discovered that data analysis is used in science and business‚ and even administration and policy-making processes. We’ve found out the data analysis can be carried out in all fields‚ including medicine and social sciences. Once an analysis is conducted the data that is carried out is documented
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Overview on Computer Security In this course‚ you have discovered how important computers and their contents are to everyone. Safeguarding your computer and its valuable information is important. You should be aware of the threats facing by your computer and data‚ and take necessary measures to protect them as well. By taking some precautionary steps‚ you can safeguard not only your hardware‚ software and data‚ but yourself. This lesson introduces you with some of the most common threats to your
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1 Secondary data analysis: an introduction All data are the consequence of one person asking questions of someone else. (Jacob 1984: 43) This chapter introduces the field of secondary data analysis. It begins by considering what it is that we mean by secondary data analysis‚ before describing the type of data that might lend itself to secondary analysis and the ways in which the approach has developed as a research tool in social and educational research. The second part of the chapter considers
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Big Data‚ Data Mining and Business Intelligence Techniques 2 What is Data? • Data is information in a form suitable for use with a computer. • There are two types of data ▫ Structured ▫ Unstructured • The total volume of data is growing 59% every year. • The number of files grow at 88% every year. 3 What is Big Data? Exa Analytics on Big Data at Rest Up to 10‚000 Times larger Peta Data Scale Giga Data at Rest Tera Data Scale Mega Traditional Data Warehouse
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Convergence combines voice‚ data‚ and video traffic __________. a. over a single IP network 4. Each of the following is a convergence security vulnerability except __________. a. convergence resource attacks (CRA) 5. Which of the following is not true regarding a demilitarized zone (DMZ)? a. It contains servers that are only used by internal network users. 6. Network address translation (NAT) __________. c. removes private addresses when the packet leaves the network 7. Each of the
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Cheyney Group Design and Development Flame Retardant Materials The flame-retardant paper material‚ Nomex‚ is designed by Cheyney Design and Development as a special solution for manufacturers and other users who have this particular need. Nomex has many applications which include the production of personal protection wear to protect Formula 1 drivers and fire-fighters from sudden combustion. It is also incorporated in the fireproof honeycomb framework the Airbus A380 wide-body aircraft. Nomex
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Social Networking Rewind back 10 years‚ before the idea of Facebook‚ Twitter‚ and YouTube became a reality. The thought that people might someday spend more than half their day on a website such as Facebook was unthinkable. These social networks sites‚ along with hundreds more‚ were just a spark in designers’ mind. Social networking has made many effects upon society. With almost anyone having access to a computer‚ it has become easier to connect virtually with one another. The constant use of
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on how we send information electronically over the Internet or through a network. Date encryption is‚ in its simplest terms‚ the translation of data into a secret code. In order to read an encrypted file‚ the receiver of the file must obtain a secret key that will enable him to decrypt the file. A deeper look into cryptography‚ cryptanalysis‚ and the Data Encryption Standard (DES) will provide a better understanding of data encryption. Cryptographic Methods There are two standard methods of
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