Outlier detection in high-dimensional data presents various challenges resulting from the “curse of dimensionality.” A prevailing view is that distance concentration, i.e., the tendency of distances in high-dimensional data to become indiscernible, hinders the detection of outliers by making distance-based methods label all points as almost equally good outliers.
The presentation was presented by Nenad Tomasev at the 7th International Conference on Machine Learning and Data Mining in Pattern Recognition (MLDM 2011) in New York, NY, USA on August 30th, 2011.
Publication: http://bit.ly/yQQsOq
Abstract:
High-dimensional data are by their very nature often difficult to handle by conventional machine-learning algorithms, which is usually characterized as an aspect of the curse of dimensionality. However, it was shown that some of the arising high-dimensional phenomena can be exploited to increase algorithm accuracy. One such phenomenon is hubness, which refers to the emergence of hubs in high-dimensional spaces, where hubs are influential points included in many k-neighbor sets of other points in the data. This phenomenon was previously used to devise a crisp weighted voting scheme for the k-nearest neighbor classifier. In this paper we go a step further by embracing the soft approach, and propose several fuzzy measures for k-nearest neighbor classification, all based on hubness, which express fuzziness of elements appearing in k-neighborhoods of other points. Experimental evaluation on real data from the UCI repository and the image domain suggests that the fuzzy approach provides a useful measure of confidence in the predicted labels, resulting in improvement over the crisp weighted method, as well the standard kNN classifier.
A probabilistic misbehavior detection scheme towards efficient trust establis...Shakas Technologies
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The presentation was presented by Nenad Tomasev at the 7th International Conference on Machine Learning and Data Mining in Pattern Recognition (MLDM 2011) in New York, NY, USA on August 30th, 2011.
Publication: http://bit.ly/yQQsOq
Abstract:
High-dimensional data are by their very nature often difficult to handle by conventional machine-learning algorithms, which is usually characterized as an aspect of the curse of dimensionality. However, it was shown that some of the arising high-dimensional phenomena can be exploited to increase algorithm accuracy. One such phenomenon is hubness, which refers to the emergence of hubs in high-dimensional spaces, where hubs are influential points included in many k-neighbor sets of other points in the data. This phenomenon was previously used to devise a crisp weighted voting scheme for the k-nearest neighbor classifier. In this paper we go a step further by embracing the soft approach, and propose several fuzzy measures for k-nearest neighbor classification, all based on hubness, which express fuzziness of elements appearing in k-neighborhoods of other points. Experimental evaluation on real data from the UCI repository and the image domain suggests that the fuzzy approach provides a useful measure of confidence in the predicted labels, resulting in improvement over the crisp weighted method, as well the standard kNN classifier.
A probabilistic misbehavior detection scheme towards efficient trust establis...Shakas Technologies
Malicious and selfish behaviors represent a serious threat against routing in Delay/Disruption Tolerant Networks (DTNs). Due to the unique network characteristics, designing a misbehavior detection scheme in DTN is regarded as a great challenge.
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Link error and malicious packet dropping are two sources for packet losses in multi-hop wireless ad hoc network. While observing a sequence of packet losses in the network, whether the losses are caused by link errors only, or by the combined effect of link errors and malicious drop are to be identified.
We provide a generic framework that, with the help of a preprocessing phase that is independent of the inputs of the users, allows an arbitrary number of users to securely outsource a computation to two non-colluding external servers.
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A Mixture Model of Hubness and PCA for Detection of Projected OutliersZac Darcy
With the Advancement of time and technology, Outlier Mining methodologies help to sift through the large
amount of interesting data patterns and winnows the malicious data entering in any field of concern. It has
become indispensible to build not only a robust and a generalised model for anomaly detection but also to
dress the same model with extra features like utmost accuracy and precision. Although the K-means
algorithm is one of the most popular, unsupervised, unique and the easiest clustering algorithm, yet it can
be used to dovetail PCA with hubness and the robust model formed from Guassian Mixture to build a very
generalised and a robust anomaly detection system. A major loophole of the K-means algorithm is its
constant attempt to find the local minima and result in a cluster that leads to ambiguity. In this paper, an
attempt has done to combine K-means algorithm with PCA technique that results in the formation of more
closely centred clusters that work more accurately with K-means algorithm .This combination not only
provides the great boost to the detection of outliers but also enhances its accuracy and precision.
A MIXTURE MODEL OF HUBNESS AND PCA FOR DETECTION OF PROJECTED OUTLIERSZac Darcy
With the Advancement of time and technology, Outlier Mining methodologies help to sift through the large
amount of interesting data patterns and winnows the malicious data entering in any field of concern. It has
become indispensible to build not only a robust and a generalised model for anomaly detection but also to
dress the same model with extra features like utmost accuracy and precision. Although the K-means
algorithm is one of the most popular, unsupervised, unique and the easiest clustering algorithm, yet it can
be used to dovetail PCA with hubness and the robust model formed from Guassian Mixture to build a very
generalised and a robust anomaly detection system. A major loophole of the K-means algorithm is its
constant attempt to find the local minima and result in a cluster that leads to ambiguity. In this paper, an
attempt has done to combine K-means algorithm with PCA technique that results in the formation of more
closely centred clusters that work more accurately with K-means algorithm
A Mixture Model of Hubness and PCA for Detection of Projected OutliersZac Darcy
With the Advancement of time and technology, Outlier Mining methodologies help to sift through the large
amount of interesting data patterns and winnows the malicious data entering in any field of concern. It has
become indispensible to build not only a robust and a generalised model for anomaly detection but also to
dress the same model with extra features like utmost accuracy and precision. Although the K-means
algorithm is one of the most popular, unsupervised, unique and the easiest clustering algorithm, yet it can
be used to dovetail PCA with hubness and the robust model formed from Guassian Mixture to build a very
generalised and a robust anomaly detection system. A major loophole of the K-means algorithm is its
constant attempt to find the local minima and result in a cluster that leads to ambiguity. In this paper, an
attempt has done to combine K-means algorithm with PCA technique that results in the formation of more
closely centred clusters that work more accurately with K-means algorithm .
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Outlier Detection in Data Mining An Essential Component of Semiconductor Manu...yieldWerx Semiconductor
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A Personal Privacy Data Protection Scheme for Encryption and Revocation of Hi...Shakas Technologies
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Shakas Technologies ( Galaxy of Knowledge)
#11/A 2nd East Main Road,
Gandhi Nagar,
Vellore - 632006.
Mobile : +91-9500218218 / 8220150373| land line- 0416- 3552723
Shakas Training & Development | Shakas Sales & Services | Shakas Educational Trust|IEEE projects | Research & Development | Journal Publication |
Email : info@shakastech.com | shakastech@gmail.com |
website: www.shakastech.com
Facebook: https://www.facebook.com/pages/Shakas-Technologies
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A Mixture Model of Hubness and PCA for Detection of Projected OutliersZac Darcy
With the Advancement of time and technology, Outlier Mining methodologies help to sift through the large
amount of interesting data patterns and winnows the malicious data entering in any field of concern. It has
become indispensible to build not only a robust and a generalised model for anomaly detection but also to
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algorithm is one of the most popular, unsupervised, unique and the easiest clustering algorithm, yet it can
be used to dovetail PCA with hubness and the robust model formed from Guassian Mixture to build a very
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closely centred clusters that work more accurately with K-means algorithm .This combination not only
provides the great boost to the detection of outliers but also enhances its accuracy and precision.
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With the Advancement of time and technology, Outlier Mining methodologies help to sift through the large
amount of interesting data patterns and winnows the malicious data entering in any field of concern. It has
become indispensible to build not only a robust and a generalised model for anomaly detection but also to
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constant attempt to find the local minima and result in a cluster that leads to ambiguity. In this paper, an
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Reverse nearest neighbors in unsupervised distance based outlier
1. 1.
#13/ 19, 1st Floor, Municipal Colony, Kangayanellore Road, Gandhi Nagar, vellore – 6.
Off: 0416-2247353 / 6066663 Mo: +91 9500218218 /8870603602,
Project Titles: http://shakastech.weebly.com/2015-2016-titles
Website: www.shakastech.com, Email - id: shakastech@gmail.com, info@shakastech.com
REVERSE NEAREST NEIGHBORS IN UNSUPERVISED DISTANCE-BASED
OUTLIER DETECTION
ABSTRACT:
Outlier detection in high-dimensional data presents various challenges resulting from the
“curse of dimensionality.” A prevailing view is that distance concentration, i.e., the tendency of
distances in high-dimensional data to become indiscernible, hinders the detection of outliers by
making distance-based methods label all points as almost equally good outliers. In this paper we
provide evidence supporting the opinion that such a view is too simple, by demonstrating that
distance-based methods can produce more contrasting outlier scores in high-dimensional
settings. Furthermore, we show that high dimensionality can have a different impact, by
reexamining the notion of reverse nearest neighbors in the unsupervised outlier-detection
context. Namely, it was recently observed that the distribution of points’ reverse-neighbor counts
becomes skewed in high dimensions, resulting in the phenomenon known as hubness. We
provide insight into how some points (antihubs) appear very infrequently in k-NN lists of other
points, and explain the connection between antihubs, outliers, and existing unsupervised outlier-
detection methods. By evaluating the classic k-NN method, the angle-based technique (ABOD)
designed for high-dimensional data, the density-based local outlier factor (LOF) and influenced
outlierness (INFLO) methods, and antihub-based methods on various synthetic and real-world
data sets, we offer novel insight into the usefulness of reverse neighbor counts in unsupervised
outlier detection.
2. 1.
#13/ 19, 1st Floor, Municipal Colony, Kangayanellore Road, Gandhi Nagar, vellore – 6.
Off: 0416-2247353 / 6066663 Mo: +91 9500218218 /8870603602,
Project Titles: http://shakastech.weebly.com/2015-2016-titles
Website: www.shakastech.com, Email - id: shakastech@gmail.com, info@shakastech.com
EXISTING SYSTEM:
The task of detecting outliers can be categorized as supervised, semisupervised, and
unsupervised, depending on the existence of labels for outliers and/or regular instances. Among
these categories, unsupervised methods are more widely applied, because the other categories
require accurate and representative labels that are often prohibitively expensive to obtain.
Unsupervised methods include distance-based methods that mainly rely on a measure of distance
or similarity in order to detect outliers.
PROPOSED SYSTEM:
It is crucial to understand how the increase of dimensionality impacts outlier detection.
As explained the actual challenges posed by the “curse of dimensionality” differ from the
commonly accepted view that every point becomes an almost equally good outlier in high-
dimensional space. We will present further evidence which challenges this view, motivating the
Examination of methods.
HARDWARE REQUIREMENTS:
• System : Pentium IV 2.4 GHz.
• Hard Disk : 40 GB.
• Floppy Drive : 1.44 Mb.
• Monitor : 15 VGA Colour.
• Mouse : Logitech.
• RAM : 256 Mb.
SOFTWARE REQUIREMENTS:
• Operating system : - Windows XP.
• Front End : - JSP
• Back End : - SQL Server