(1) The document discusses algorithms analysis using the divide and conquer paradigm and the master theorem. It analyzes the running times of binary search, merge sort, and quicksort using the master theorem.
(2) For quicksort, it shows that picking a random pivot element leads to an expected running time of O(n log n) since it balances the problem sizes on both sides of the pivot in each recursive call.
(3) It ultimately derives that the expected running time of quicksort is O(n log n).
Find the compact trigonometric Fourier series for the periodic signal.pdfarihantelectronics
Find the compact trigonometric Fourier series for the periodic signal x(t) and sketch the
amplitude and phase spectrum for first 4 frequency components. By inspection of the spectra,
sketch the exponential Fourier spectra. By inspection of spectra in part b), write the exponential
Fourier series for x(t)
Solution
ECE 3640 Lecture 4 – Fourier series: expansions of periodic functions. Objective: To build upon
the ideas from the previous lecture to learn about Fourier series, which are series representations
of periodic functions. Periodic signals and representations From the last lecture we learned how
functions can be represented as a series of other functions: f(t) = Xn k=1 ckik(t). We discussed
how certain classes of things can be built using certain kinds of basis functions. In this lecture we
will consider specifically functions that are periodic, and basic functions which are
trigonometric. Then the series is said to be a Fourier series. A signal f(t) is said to be periodic
with period T0 if f(t) = f(t + T0) for all t. Diagram on board. Note that this must be an everlasting
signal. Also note that, if we know one period of the signal we can find the rest of it by periodic
extension. The integral over a single period of the function is denoted by Z T0 f(t)dt. When
integrating over one period of a periodic function, it does not matter when we start. Usually it is
convenient to start at the beginning of a period. The building block functions that can be used to
build up periodic functions are themselves periodic: we will use the set of sinusoids. If the period
of f(t) is T0, let 0 = 2/T0. The frequency 0 is said to be the fundamental frequency; the
fundamental frequency is related to the period of the function. Furthermore, let F0 = 1/T0. We
will represent the function f(t) using the set of sinusoids i0(t) = cos(0t) = 1 i1(t) = cos(0t + 1)
i2(t) = cos(20t + 2) . . . Then, f(t) = C0 + X n=1 Cn cos(n0t + n) The frequency n0 is said to be
the nth harmonic of 0. Note that for each basis function associated with f(t) there are actually two
parameters: the amplitude Cn and the phase n. It will often turn out to be more useful to
represent the function using both sines and cosines. Note that we can write Cn cos(n0t + n) = Cn
cos(n) cos(n0t) Cn sin(n)sin(n0t). ECE 3640: Lecture 4 – Fourier series: expansions of periodic
functions. 2 Now let an = Cn cos n bn = Cn sin n Then Cn cos(n0t + n) = an cos(n0t) + bn
sin(n0t) Then the series representation can be f(t) = C0 + X n=1 Cn cos(n0t + n) = a0 + X n=1 an
cos(n0t) + bn sin(n0t) The first of these is the compact trigonometric Fourier series. The second
is the trigonometric Fourier series.. To go from one to the other use C0 = a0 Cn = p a 2 n + b 2 n
n = tan1 (bn/an). To complete the representation we must be able to compute the coefficients.
But this is the same sort of thing we did before. If we can show that the set of functions
{cos(n0t),sin(n0t)} is in fact an orthogonal set, then we can use the same.
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while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion should be inserted
while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion should be inserted
while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion should be inserted
while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion should be inserted
while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion should be inserted
while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion should be inserted
while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion should be inserted
while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion should be inserted
while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion should be inserted
while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion should be inserted
while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion should be inserted
while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion should be inserted
while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion should be inserted
while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion should be inserted
while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion should be inserted
while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion should be inserted
while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion should be inserted
while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion should be inserted
while some elements unsorted:
Using linear search, find the location in the sorted portion where the 1st element of the unsorted portion
In computer science, divide and conquer (D&C) is an algorithm design paradigm based on multi-branched recursion. A divide and conquer algorithm works by recursively breaking down a problem into two or more sub-problems of the same (or related) type, until these become simple enough to be solved directly. The solutions to the sub-problems are then combined to give a solution to the original problem.
In computer science, merge sort (also commonly spelled mergesort) is an O(n log n) comparison-based sorting algorithm. Most implementations produce a stable sort, which means that the implementation preserves the input order of equal elements in the sorted output. Mergesort is a divide and conquer algorithm that was invented by John von Neumann in 1945. A detailed description and analysis of bottom-up mergesort appeared in a report by Goldstine and Neumann as early as 1948.
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Immunizing Image Classifiers Against Localized Adversary Attacks
pradeepbishtLecture13 div conq
1. Design and Analysis of Algorithms
COT 5405
CLASS NOTES
14th
October 2003
Overview:
• Divide and Conquer
• Master theorem
• Master theorem based analysis for
Binary Search
Merge Sort
Quick Sort
Divide and Conquer
Basic Idea:
1. Decompose problems into sub instances.
2. Solve sub instances successively and independently.
3. Combine the sub solutions to obtain the solution to the original
problem.
In order to look into the efficiency of the Divide and Conquer lets look into the
Multiplication of two n-digit Numbers
Traditional Multiplication:
Say we are multiplying 382 with 695(n=3)
382
* 695
- - - - -
Essentially, we are multiplying 1 digit with n other digits and then adding the n numbers,
which can give us a solution of at most 2n digits.
There are n additions, each of O(n) time at most, which gives us the running time of the
algorithm as O(n2
)
2. !!Using Divide and Conquer to multiply n-digit numbers
We will write the two n-digit numbers as follows:
(10n/2
X + Y) (10n/2
W+Z) =10n
XW + (XZ + YW) 10n/2
+YZ ---(1)
That is we are converting the multiplication of two n-digit numbers into multiplication of
four n/2 digit numbers, plus some extra work involved in additions. We are recursively
calling multiplication and performing some additions in every recursion.
Let T (n) be the running time of multiplying two n-digit numbers.
Then in our case,
T (n) = 4T (n/2) +O (n)
• Four multiplications of n/2 digit numbers
• Addition is going to be between numbers that have atmost 2n digits. Thus
addition can be O (n).
Recursively substituting the value of T (n):
T (n) = 4 [4T (n/4) + O (n/2)] +O (n)
=16 T (n/4) + 4O (n/2) + O (n)
-
-
-
=C T (1) + - - - -
Master’s Theorem
Let T(n) be the running time of an algorithm with an input size of n;
Suppose we can run the algorithm in such a way that we make ‘a’ recursive calls every
time with an input size of ‘n/b’ and do some extra work in every recursion (additions and
subtractions).
Such that T (n) can be represented as:
T (n) = a T (n/b) + O (nk
),
Then,
If log ba>k, T (n) =O (nlog
b
a
) (recursive calls dominates)
If log ba=k, T (n) =O (nk
log n) (almost equal work in rec. calls and in extra work)
If log ba<k, T (n) =O (nk
) (Extra work dominates)
In our multiplication problem:
T (n) = 4T (n/2) +O (n)
A=4, b=2
Log24=2, k=1
Since algorithm is dominated by recursive calls and the running time is O (n2
).
3. But this is as good as our traditional multiplication algorithm. Since we now know that
multiplications dominate the running time, if we can reduce the number of
multiplications to three, which can bring down our T(n) by 25%.
To calculate (1), we just need the following 3 multiplications separately:
1. (X+Y)(W+Z) 2 additions and one multiplication
2.XW
3.YZ
Then we can calculate
XZ+YW=(X+Y)(W+Z)-XW-YZ
Thus we use three multiplications at the expense of some extra additions and
subtractions, which run in constant time( each of O(n) time)
Thus,
T(n)=3T(n/2) + O(n)
Applying Master’s theorem,
A=3,b=2,k=1
Thus, T(n)=O(nlog
2
3
)
Since log
2
3 ~ 1.5,
We have reduced the total number of recursive calls in our program. For very large n, it will work well but in actual
implementation, we hardly code to gain advantage out if this feature.
Binary Search
Goal: Searching for nth value in a sorted list of length n.
(Divide the list into two and recursively search in the individual lists half the size)
Again,
Let T(n) be the running time of the algorithm. Then,
T(n)=T(n/2) + O(1)
In O(1) time we divide the list into two halves(n/2) that run in T(n/2) time.
Using Master’s theorem,
A=1,b=2
Log21=0
K=0;
So,
T(n)=O(log n)
Merge Sort
Goal: Sp litting the element list into 2 lists, sort them and merge them.
T(n)=2T(n/2) + O(n)
4. Here, the hidden constant is greater than the hiddent constant in the merge sort because
while dividing the lists into two different arrays and then sorting them, we are allocating
extra space and subsequently, copying into the original array.
Using Master’s theorem,
A=2,b=2,k=1
Log22=1
So, T(n)=O(n log n)
Quicksort
Goal: Pick one element as the partition element. Put all the elements smaller than it, to
the left of it and all elements greater than it, to the right of it. On the lists left and right of
the partition element recursively call Qsort.
Say the list is: 8,3,6,9,2,4,7,5
Partition element:5
8, 3, 6, 9, 2, 4, 7, 5
8 in the worng place, 7 fine.
8, 3, 6, 9, 2, 4, 7, 5
4 ,3 ,6 ,9 , 2 ,8 ,7 ,5
4, ,3, 2, 9, 6, 8, 7, 5
4, 3 ,2 ,9 ,6 ,8 ,7 ,5
front Last
front Last
front last
front last
last front
5. Now swap front with 5 and we have 5 in place.
4,3,2,5,6,8,7,9
Thus the only extra space utilized here is the temporary variable used for swapping.
In te worst case, we might end up choosing a partition element which is the first element
in our list.
In that case T(n)=O(n2
)
To make sure this rarely happens:
1. Pick a random partition element.
2. Probablity of picking a good partition element is as low as the probability of
picking a bad one. So, they will even out.
There are n possible partition elements
Element Split Prob(element)
1 0,n-1 1/n
2 1,n-2 1/n
3 1/n
N n-1,0 1/n
Now,
T (n) = 1/n [ T(0) + T(n-1) + O(n) ] +
1/n [ T(1) + T(n-2) + O(n) ] +
1/n [ T(2) + T(n-3) + O(n) ] +
……
……
……
1/n [T (n-1) + T (0) + O (n)]
n * T[n] = {2 k=0Σn-1
T(k)} + O(n2
) A
Substitute n = n-1,
(n-1) * T[(n-1)] = {2 k=0Σn-1
T(k)} + O((n-1)2
)B
Subtract A from B
6. n T(n) - (n-1)T(n-1) = 2 T(n-1) + O(n)
n T(n) = n+1 T(n-1) + O(n)
T(n) = ((n+1)/n )T(n-1) + O(1)
Divide by (n+1)
T(n)/(n+1) = [T(n-1) ]/ n + O(1/n) C
Let,
S(n) = T(n)/(n+1) D
S(n) = S(n-1) + O(1/n)
This can be written as a sum,
= S(n-2) + O(1/n-1) + O(1/n)
= S(n-3) + O(1/n-2) + O(1/n-1) + O(1/n)
S(n) = O(k=1 Σ n
1/k)
= O( Hn)
S(n) = T(n)/(n+1) = O (ln n) E
Substitute D in C
T(n) = S(n) . (n+1)
use E,
T(n) = O (ln n) . (n+1)
T(n) = O (n lg n )
Notes compiled by Shankar Vaithianthan and Harjinder Mandarh
7. n T(n) - (n-1)T(n-1) = 2 T(n-1) + O(n)
n T(n) = n+1 T(n-1) + O(n)
T(n) = ((n+1)/n )T(n-1) + O(1)
Divide by (n+1)
T(n)/(n+1) = [T(n-1) ]/ n + O(1/n) C
Let,
S(n) = T(n)/(n+1) D
S(n) = S(n-1) + O(1/n)
This can be written as a sum,
= S(n-2) + O(1/n-1) + O(1/n)
= S(n-3) + O(1/n-2) + O(1/n-1) + O(1/n)
S(n) = O(k=1 Σ n
1/k)
= O( Hn)
S(n) = T(n)/(n+1) = O (ln n) E
Substitute D in C
T(n) = S(n) . (n+1)
use E,
T(n) = O (ln n) . (n+1)
T(n) = O (n lg n )
Notes compiled by Shankar Vaithianthan and Harjinder Mandarh