Defense Notices

This work formally introduces a generalized fuzzy logic and interval clustering (FLIC) technique which,when integrated with existing supervised learning algorithms, improves their performance. FLIC is a method that was first integrated with neural network in order to improve neural network’s performance in drug discovery using high throughput screening (HTS). This research strictly focuses on binary classification problems and generalizes the FLIC in order to incorporate it with other machine learning algorithms. In most binary classification problems, the class boundary is not linear. This pose a major problem when the number of outliers are significantly high, degrading the performance of the supervised learning function. FLIC identifies these misclassifications before the training set is introduced to the learning algorithm. This allows the supervised learning algorithm to learn more efficiently since it is now aware of those misclassifications. Although the proposed method performs well with most binary classification problems, it does significantly well for data set with high class asymmetry. The proposed method has been tested on four well known data sets of which three are from UCI Machine Learning repository and one from BigML. Tests have been conducted with three well known supervised learning techniques: Decision Tree, Logistic Regression and Naive Bayes. The results from the experiments show significant improvement in performance. The paper begins with a formal introduction to the core idea this research is based upon. It then discusses a list of other methods that have either inspired this research or have been referred to, in order to formalize the techniques. Subsequent sections discuss the methodology and the algorithm which is followed by results and conclusion. 

Keyword: supervised learning, binary classification, fuzzy logic, clustering 

IT Service Management (ITSM) is an IT function associated with resolving user issues through the support of a service desk. Some of the widely used ticket management tools that service desk utilizes include Remedy, Falcon and ServiceNow. These tools typically use a web portal as a front end for users to submit issues. Alternately, these tools may have a dedicated application that can be installed on a device. However, an application may not be compatible with various devices and is also very costly to maintain compatibility with current technology. Access to web portals requires a high bandwidth internet connection and connectivity could be a challenge in restricted areas. In these cases, a user’s only option is to report an issue via email. Email is supported on most connected devices and has very low internet bandwidth requirement. It also tends to be an ideal solution for traveling professionals. However, none of these ITSM tools provide a convenient mechanism to log tickets via email. Emails have to be manually converted to a ticket by the service desk. This process has a potential for human errors. 

With this objective, we have implemented an auto ticketing tool, 'TicketWise' that will automatically convert email requests into service tickets. This tool provides the necessary technological bridge for interfacing an email service with a ticketing system. This is a new feature that can be integrated with existing ITSM tools. New tickets get created for users who are registered with the system. Non-registered emails are automatically filtered out. Upon receiving a confirmation email the user can also send a follow up email. This information also gets updated in the ticket work log. 

TicketWise has been integrated with an application, 'TicketMe' that simulates a ticketing system. Validation has been successfully conducted by sending emails from a registered and a non-registered email address. In the former case, a new ticket was successfully created. In the latter, the email was filtered out. Contents from a follow up email for the ticket confirmation were also successfully added to the ticket work log. The results of the validation were satisfactory. 

Dementia is a major public health problem affecting 35 million people in USA. The caregivers of dementia patients experience many types of physical and psychological stress while dealing with disruptive behaviors of dementia patients. This will also result in frequent hospitalizations and re-admissions. In this project we design, implement, and measure the performance of an advanced video based monitoring system to aide the caregivers in managing the behavioral symptoms of dementia patients. The caregivers will be able to easily capture and share the antecedents, consequences, and the function of behavior, through a video clip, and get the real-time feedback from clinical experts. Overall the system will help in reducing the hospital admission/readmission, improve the quality of life for caregivers, and in general result in reduced cost of health care systems. System is developed using python scripts, open source web frameworks, FFmpeg tool chain, and commercial off-the-shelf IP camera and mini-PC. WebRTC is used for video based coaching of caregivers. A framework has been developed to evaluate the storage and retrieval latency of video clips to public and On-premise clouds, video streaming performance in LAN and WLAN environments, and WebRTC performance in different types of access networks. InstaGENIrack, a GENI rack in KU is used as on-premise cloud infrastructure for the evaluation. OpenSSL utilities are employed for secured transport and storage of captured video clips. We conducted the trials in Google fiber ISP in Kansas city, and compared the performance with other traditional ISPs..

Program execution can be classified into phases. These phases can be repeated during a single execution of the application. Ability to identify and classify the phases statically will help prepare the system early for the next phase, which can benefit overall program performance at run time. While static program phase detection algorithms have been explored for binary executable with promising results, to the best of our knowledge, such algorithms have not been targeted and evaluated for managed language, specifically Java, programs. Accurate detection of future program phases can allow the Java virtual machine to perform phase-specific optimizations to improve performance. 

In this project, we build a framework to detect program phases and insert software phase markers in Java byte code. We employ an existing algorithm to detect program phases and adapt it to detect phases for Java binaries. We modify the control flow graph generated by the byte code analysis tool WALA (Watson library for Analysis) to integrate program loops. We analyze each method in the control flow graph produced by WALA to detect loops, and convert the call graph into a "call loop graph". We then rely on program profiling to provide data on the number of times each basic block and edge is reached at run-time. We use this profiling information to determine the average number of instructions executed along each graph edge, the average number of times an edge is executed and the standard deviation for instructions on these edges in our algorithm to identify the software phase markers. 

Software defined radios (SDR) are a rapidly evolving technology which are used widely in industry and academia today. They offer a very low cost and flexible alternative for implementing and testing wireless technologies since most of the physical layer functionalities are implemented in 
software instead of hardware. Universal Software Defined Radio Peripheral (USRP) is one of the most popular products belong to the family of SDR. GNURadio, a software development kit comprising of C++ and Python libraries is widely used with USRP as a hardware platform to create SDR applications. 
In this project a tested is implemented for performance analysis of an OFDM communication system using GNURadio and USRP. The performance is analyzed and studied in a practical laboratory environment using GNURadio and USRP. The packet error rate versus SNR is calculated in different 
environmental settings .The effect of Interference and obstruction is also taken into account in studying the performance.

Sounding the ice sheets of Greenland and Antarctica is a vital component in determining the affect of global warming on sea level rise. Of particular importance to measure are the outlet glaciers that transport ice from the interior to the edge of the ice sheet. These outlet glaciers are difficult to sound due to crevassing caused by the relatively fast movement of the ice in the glacial channel and higher signal attenuation caused by warmer ice. The Center for Remote Sensing of Ice Sheets (CReSIS) uses multi-channel airborne radars with methods for achieving better resolution and signal-to-noise ratio (SNR) in the three major dimension to sound outlet glaciers. Synthetic aperture radar (SAR) techniques are used in the along-track dimension, pulse compression in the range dimension, and an antenna array in the cross-track dimension. 

CReSIS has developed a SAR processor to effectively and efficiently process the data collected by these radars in each dimension. To validate the performance of this processor a SAR simulator was developed with the functionality to test multiple aspects of the SAR processor. In addition to the implementation of this simulator for validation of processing the data in the along-track, cross-track and range dimensions, there are a number of data-dependent processing steps that can affect the quality of the final data product. These include creating matched filters for each dimension of the data, removing phase and amplitude differences between receive channels, and determining the optimal along-track beamwidth to use for processing the data. All of these factors can improve the ability to obtain the maximum amount of information from the collected data. The validation and optimal processing parameters and their theory are discussed here. 

Rapid development of high throughput technologies and database management systems has made it possible to produce and store large amount of data. However, making sense of big data and discovering knowledge from it is a compounding challenge. Generally, data mining techniques search for information in datasets and express gained knowledge in the form of trends, regularities, patterns or rules. Rules are frequently identified automatically by a technique called rule induction, which is the most important technique in data mining and machine learning and it was developed primarily to handle symbolic data. However, real life data often contain numerical attributes and therefore, in order to fully utilize the power of rule induction techniques, an essential preprocessing step of converting numeric data into symbolic data called discretization is employed in data mining. 
Here we present two entropy based discretization techniques known as dominant attribute approach and multiple scanning approach, respectively. These approaches were implemented as two explicit algorithms in a JAVA programming language and experiments were conducted by applying each algorithm separately on seventeen well known numerical data sets. The resulting discretized data sets were used for rule induction by LEM2 or Learning from Examples Module 2 algorithm. For each dataset in multiple scanning approach, experiments were repeated with incremental scans until interval counts were stabilized. Preliminary results from this study indicated that multiple scanning approach performed better than dominant attribute approach in terms of producing comparatively smaller and simpler rule sets. 

In this thesis, we apply and analyze three direction of arrival (DoA) algorithms to tackle two distinct problems: one belongs to wireless communication, the other to radar signal processing. Though the essence of these two problems is DoA estimation, their formulation, underlying assumptions, application scenario, etc. are totally different. Hence, we write them separately, with ESPRIT algorithm the focus of Part I and MUSIC and MLE detailed in Part II. 

For wireless communication scenario, mobile data traffic is expected to have an exponential growth in the future. In “massive MIMO” systems, a base station will rely on the uplink sounding signals from mobile stations to figure out the spatial information to perform MIMO beamforming. Accordingly, multi-dimensional parameter estimation of a ray-based multipath wireless channel becomes crucial for such systems to realize the predicted capacity gains. We study joint angle and delay estimation for such system and results suggest that the dimension of the antenna array at the base station plays an important role in determining the estimation performance. These insights will be useful for designing practical “massive MIMO” systems in future mobile wireless communications. 

For the problem of radar sensing of ice sheet topography, one of the key requirements for deriving more realistic ice sheet models is to obtain a good set of basal measurements that enables accurate estimation of bed roughness and conditions. For this purpose, 3D tomography of the ice bed has been successfully implemented with the help of DoA. The SAR focused datasets provide a good case study. For the antenna array geometry and sample support used in our tomographic application, MUSIC performs better originally using a cross-over analysis where the estimated topography from crossing flight lines are compared for consistency. However, after several improvements applied to MLE, MLE outperforms MUSIC. We observe that, the spatial bottom smoothing, aiming to remove the artifacts made by MLE algorithm, is the most essential step in the post-processing procedure. The 3D tomography we obtained lays a good foundation for further analysis and modeling of ice sheets. 

With the fast development of computer and information technologies, online social networks grow dramatically. While huge amount of information is distributed expeditiously in online social networking sites, privacy concerns arise. 
In this dissertation, we first study the vulnerabilities of user attributes and contents, in particular, the identifiability of the users when the adversary learns a small piece of information about the target. We further employ an information theory based approach to quantitatively evaluate the threats of attribute-based re-identification. We have shown that large portions of users with online presence are highly identifiable. 
The notion of privacy as control and information boundary has been introduced by the user-oriented privacy research community, and partly adopted in commercial social networking platforms. However, such functions are not widely accepted by the users, mainly because it is tedious and labor-intensive to manually assign friends into such circles. To tackle this problem, we introduce a social circle discovery approach using multi-view clustering. We present our observations on the key features of social circles, including friendship links, content similarity and social interactions. We treat each feature as one view, and propose a one-side co-trained spectral clustering technique, which is tailored for the sparse nature of our data. We evaluate our approach on real-world online social network data, and show that the proposed approach significantly outperforms structure-based clustering. Finally, we build a proof-of-concept demonstration of the automatic circle detection and recommendation approaches.

The aim of this project is to identify the family related information of a person from their Twitter Data. We use their personal details, tweets and their friends’ details in order to achieve this. Since, we deal with the modern world short text data; we have used a hybrid information retrieval methodology taking into account the Parts of Speech of the data, Phrase Similarity and the Semantic Similarity of the data along with the openly available twitter data. The future use of this research is to develop a Client Side protection tool that will help users validate the data to be posted for privacy breech.