Posted by admin on Jun 30, 2020 in Computers | 0 comments
Regression
Regression is a well-known statistical technique to model the predictive relationship between several independent variables (DVs) and one dependent variable. The objective is to find the best-fitting curve for a dependent variable in a multidimensional space, with each independent variable being a dimension. The curve could be a straight line, or it could be a nonlinear curve. The quality of fit of the curve to the data can be measured by a coefficient of correlation (r), which is the
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Posted by admin on Feb 29, 2020 in Computers | 0 comments
1. We can already build networks with links and switches and send fr..so then why do we need network layer?
The above design does not scale to large network – can blow up of routing table, broadcast will bring the network down. Doesn’t work across for more than one link layer tech like WIFI, 3G. Not much control over the traffic
2. Describe the steps of the shortest path finding Dijkstra’s Algorithm.
Start with source. Set distance at other nodes to infinity (∞) but source
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Posted by admin on Feb 4, 2020 in Computers | 0 comments
28.a) Sixteen-bit messages are transmitted using a Hamming code. How many check bits are needed to ensure that the receiver can detect and correct single-bit errors? (b) Show the bit pattern transmitted for the message 1101001100110101. Assume that even parity is used in the Hamming code.
a) Parity bits are needed at positions 1, 2, 4, 8, and 16 for messages that do not extend beyond 31 bits (including the parity bits). Our message has 16 data bits and 5 parity bits, for a total of 21 bits.
b. We
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Posted by admin on Jan 15, 2020 in Computers | 0 comments
Chapter 4 Project UML
1.) UML – USE CASE
Elements
System: the software to be developed.
Represented as a rectangle with a name label at the top.
2) Actors: people or other external systems that interact with the system.
Represented as a stick figure with a name label.
Primary actors: who initiate actions appear to the left of the system
Secondary actors: who react to actions appear on the right of the system
All actors should be outside the system
3) Use cases: all possible operations the system can support
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Posted by admin on Nov 4, 2019 in Computers | 0 comments
Be recognized: A child is recognised as a person under the age of 18, unless national laws recognise an earlier age of majority. ARTICLE 2 Non-discrimination: All rights apply to all children without exception. It is the State’s obligation to protect children from any form of discrimination and to take positive action to promote their rights. ARTICLE 3 Adequate care : A child is recognised as a person under the age of 18, unless national laws recognise an earlier age of majority. ARTICLE 4 Implementation
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Posted by admin on Aug 5, 2019 in Computers | 0 comments
1. Television channels are 6 MHz wide. How many bits/sec can be sent if four-level digital signals are used?
“Max. data rate = 2B log 2 V bits/sec”, we can sample = 2 (6MHz) log 2 (4) = 24 million times/sec. four-level signals = 24 Mbps.
2. If a binary signal is sent over a 3-kHz channel whose signal-to-noise ratio is 20 dB, what is the maximum achievable data rate?
S/N = 10^2 = 100. So max data rate = (3000Hz)log2(1+100)bits/sec = 3000 * 6.643 = 19.92kbps
3. When the data-rate in T1 is 1.544
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