This website uses cookies to ensure you have the best experience. Learn more

The Largest And Best Association In The Free Paper Industry

2067 words - 9 pages


A Ukil*, R Živanović*
*Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa.
Abrupt change detection-based signal segmentation has significant role to play in automatic
segmentation of signal. The segmented signal can be used for automated analysis and effective further processing.
Abrupt change detection-based automatic signal segmentation has been effectively utilized for automatic
disturbance recognition in South Africa. In this paper, we describe the application of the abrupt change detectionbased automatic signal segmentation ...view middle of the document...

In the scope of this paper, we describe the application
of the abrupt change detection-based automatic
signal segmentation for the analysis of the power
oscillation signals obtained from the Mexican
interconnected system (MZD-DGD) [2]. We present
the applications results by applying our segmentation
algorithms to the test signals for the inter-area
oscillation in the MZD-DGD, acquired in
collaboration with the Mexican team.


Detection of abrupt changes in signal characteristics
is a much studied subject with many different
approaches. A possible approach to recognitionoriented signal processing consists of using an
automatic segmentation of the signal based on abrupt
changes detection as the first processing step. Many
of these signals are quasi-stationary, that is, the
signals are composed of segments of stationary
behavior with abrupt changes in their characteristics
in the transitions between different segments. It is
imperative to find the time-instants in which the
changes occur and to develop models for the
different segments during which the system does not
change. A segmentation algorithm splits the signal
into homogeneous segments, the lengths of which are

adapted to the local characteristics of the analyzed
signal. This can be achieved either on-line or off-line
Assuming a parametric system model, we consider a
quasi-stationary sequence of k independent observations x , with a d-dimensional parameter vector
θ which describes the properties of the observations.
Before the unknown change time t 0 , the parameter θ
is equal to θ 0 , while after the change, it is equal to
θ 1 ≠ θ 0 . At this stage, two tasks are necessary: to
detect the change time-instant t 0 and to estimate the
corresponding parameter vectors θ 0 and θ 1 . With the
primary focus on detecting the change time-instant
t 0 , it is useful to consider t 0 a random unknown
variable with unknown distribution [3].


To accomplish the abrupt change detection, hence
segmentation of the power system disturbance signals, the following algorithms are considered.

Recursive Identification Method [4]

Wavelet Transform Method [5]

Adaptive Whitening Filter and Wavelet
Method [6]

Adjusted Haar Wavelet Method [7]

Complete Algorithm [1].

In Fig 1, we show an application result for the
segmentation of a fault signal obtained from the
ESKOM digital fault recorders (DFRs) implemented
using MATLAB, based on the wavelet transform
method [5].

Proceedings of the 15th Southern African Universities Power Engineering Conference



Fig 2: Active Power Flow Oscillations in the Mexican Interconnected System (MZD-DGD).

Fig 1: RED Phase Current Signal Segmentation.

In Fig 1, the original DFR recording for current
during the fault in the RED-Phase is shown in the top
section, wavelet coefficients for this fault signal (in

Other Papers Like The Largest And Best Association In The Free Paper Industry

Obesity And The Food Industry Essay

995 words - 4 pages and how the food industry contributes to this dystopia we’re working towards. Mark Bittman is an American food journalist, columnist for the New York Times, and author of 14 books and cookbooks. One of these books was awarded the James Beard Award for General Cooking. Working for the New York Times since 1996, Bittman has slowly worked his way up to the current lead food writer for the paper. He has been featured on NPR, The Today Show, and

The Best Fundraiser Idea Essay

312 words - 2 pages I think it is imperative to become innovative and creative with new ways to attract donors for organization fundraising. Using the Halloween season is the best reason to give after Christmas (Waters, 2012). In the media, zombie popularity has surged. With The Walking Dead being the most top rated show in the country, there seems to be zombies everywhere. The zombie fad is displayed in books, movies, games, music, and even in the streets-zombie

The Best Holiday Ever

513 words - 3 pages The best holiday ever My best holiday was when I went to San Diego, California with my family. When my dad told me I was very exited, because it was going to be my first time in the United State of America. I took a month break of school and went to America with my family. I was going to see some members of my family, who I had never met before in my whole live. I was exited to see my family and on the other hand I was exited to see America

Me By The Best

1021 words - 5 pages Chapter 16 Progress Assessment Page 450 1. What are the four traditional elements of the promotion mix? The four traditional promotional tools are advertising, personal selling, public relations, and sales promotion. The product itself can also be a promotional tool. Advertising is paid, nonpersonal communication through various media by organizations and individuals who are in some way identified in the advertising message. Next comes

Comparison Of Different Types Of Media And The Impact Of Online Media In The Hotel Industry

1177 words - 5 pages Comparison of different types of media and the impact of online media in the hotel industry With more and more people are becoming internet savvy, communicates with the customer through Internet is more efficient and cost effective. Online and social media open up a new way to distribute promotion messages to potential customers. The aim of this paper attempts to analysis the difference between traditional media and online media and how

Monopolistic Competition In The Retail Industry

986 words - 4 pages product or service, it becomes a part of the monopolistic competition market. Monopolistically, markets are dominated by the following trends: the demand curve is down-ward sloping, no major barriers to entry or exit, profit maximizers, make up the large majority of advertisers, specialize in product differentiation, and each company is free to set their own price and level of output. Due to the retail industry having a large number of firms and

Competitive Positioning In The Video Game Industry

631 words - 3 pages in the realm of teenage boys. All in all, the industry is faring well with reported sales of 273 million units in 2009, generating an astounding $10.5 billion in revenue. However, it is rather difficult to enter as many games necessitate enormous investments. Not only is it tough to enter, it’s extremely competitive since the big players already own a vast majority of the best brands and are interrelated, thereby enjoying great competitive

The Importance Of Icts In Aviation Industry

4400 words - 18 pages , relieving hot flashes and mood swings associated with menopause and improving blood glucose control, however large studies using human subjects are still needed to confirm these findings. Incorporating more grapes into your diet Grapes are available year round. Select grapes that are tight to the touch and free of wrinkles. Grapes are best stored in the refrigerator and should be washed before eaten. The best way to consume grapes is fresh

Best Buy - The Importance Of Organizational Culture And Change

1099 words - 5 pages Environment) Program. This paper will describe the culture of Best Buy. This paper will also discuss the approach to organizational change that the ROWE program illustrates. This case has sources of stress and this paper will discuss the sources that are apparent in the case. Changes have occurred and this paper will discuss whether the organizational culture has helped with the change. Describe the culture of Best Buy Best Buy’s culture has

Current Trends In Maritime Shipping Today And The Latest Issues Faced By Shipping Industry

4810 words - 20 pages Current trends in maritime shipping today and the latest Issues faced by shipping industry Contents Page Introduction 2 Trends • Containerization

Five Competitive Forces In The Biotechnology Industry And Its Economics Scenarios

1797 words - 8 pages Five Competitive Forces in the Biotechnology Industry and Its Economics Scenarios Table of Contents Industry Analysis 3 About the Biotechnology Industry 3 The future of Biotech companies is bright 4 Porter's Five Forces 4 Threat of New Entrants 4 Power of Suppliers 4 Power of Buyers 5 Competitive Rivalry 5 Forecast Industry 5 Competitors 6 Economic Scenarios 7 Increased Demand for Money 7 Increase of Money Supply 8

Related Essays

Colombia And The Largest Gas And Oil Company Is South America:

7312 words - 30 pages years, following state laws of natural recourse extraction and via ambitious acquisitions, Ecopetrol S.A. growth to become an internationally known gas and oil extracting company. It has not only grown to be one of the 40 largest companies in the world but also one of the four main petroleum companies in Latin America competing in the gas and oil integrated industry in 2009 and number one in 2012. Ecopetrol grown dramatically between the years of

Health And Safety Management In The Workplace In Chemical Industry

4460 words - 18 pages takes into account the control measures currently implemented and then assign priority accordingly. The risks are ranked as trivial “low priority”, adequately controlled and not adequately controlled “high priority” (CCH, 2004, 107). Obviously, the high priority risk should be dealt with first. In the chemical industry; hazard evaluation is best performed by qualified personnel who possess knowledge in both hazard evaluation and the nature of the

Competition In The Movie Rental Industry: Netflix And Redbox

1707 words - 7 pages SUBJ: A Look at the Competition Within the Movie Rental Industry EXECUTIVE SUMMARY: Analysis: The competitive forces in the movie rental industry are quite strong, as I will explain through the five forces model. There are a vast amount of substitutes for watching a movie. You can go to a play, sporting event, concert, out the lake/beach, go for a run, watch regular television, go shopping; I could go on and on. Also, torrenting or

The Mortgage Industry In Kenya Essay

509 words - 3 pages Mortgages A mortgage is a debt instrument that is secured by the collateral of specified real estate property and that the borrower is obliged to pay back with a predetermined set of payments. Mortgages are used by individuals and businesses to make large purchases of real estate without paying the entire value of the purchase up front. Mortgages in Kenya fall under two types, that is, a. Fixed rate mortgages The borrower will owe a percentage