Abstract

This paper presents a Novel Identification System which uses generative modeling techniques and Gaussian Mixture Models (GMMs) to identify the main process variables involved in a novel event from multivariate data. Features are generated and subsequently dimensionally reduced by using a Variational Autoencoder (VAE) supplemented by a denoising criterion and a β disentangling method. The GMM parameters are learned using the Expectation Maximization(EM) algorithm on features collected from only normal operating conditions. A one-class classification is achieved by thresholding the likelihoods by a statistically derived value. The Novel Identification method is verified as a detection method on existing Radio Frequency (RF) Generators and standard classification datasets. The RF dataset contains 2 different models of generators with almost 100 unique units tested. Novel Detection on these generators achieved an average testing true positive rate of 97.31% with an overall target class accuracy of 98.16%. A second application has the network evaluate process variables of the RF generators when a novel event is detected. This is achieved by using the VAE decoding layers to map the GMM parameters back to a space equivalent to the original input, resulting in a way to directly estimate the process variables fitness.

Library of Congress Subject Headings

Signal processing--Digital techniques; Pattern recognition systems; Classification--Data processing; Machine learning

Publication Date

8-2018

Document Type

Thesis

Student Type

Graduate

Degree Name

Electrical Engineering (MS)

Department, Program, or Center

Electrical Engineering (KGCOE)

Advisor

Ferat Sahin

Advisor/Committee Member

Sohail A. Dianat

Advisor/Committee Member

Ahmet Okutan

Campus

RIT – Main Campus

Plan Codes

EEEE-MS

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