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open access

Analyzing Microwave Spectra Collected by the Solar Radio Burst Locator

Modern communication systems rely heavily upon microwave, radio, and other electromagnetic frequency bands as a means of providing wireless communication links. Although convenient, wireless communication is susceptible to electromagnetic interference. Solar activity causes both direct interference through electromagnetic radiation as well as indirect interference caused by charged particles interacting with Earth's magnetic field. The Solar Radio Burst Locator (SRBL) is a United States Air For… more

Date: May 2007

Creator: Kincaid, Cheryl-Annette

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Adaptive Planning and Prediction in Agent-Supported Distributed Collaboration.

Agents that act as user assistants will become invaluable as the number of information sources continue to proliferate. Such agents can support the work of users by learning to automate time-consuming tasks and filter information to manageable levels. Although considerable advances have been made in this area, it remains a fertile area for further development. One application of agents under careful scrutiny is the automated negotiation of conflicts between different user's needs and desires. M… more

Date: December 2004

Creator: Hartness, Ken T. N.

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

FP-tree Based Spatial Co-location Pattern Mining

A co-location pattern is a set of spatial features frequently located together in space. A frequent pattern is a set of items that frequently appears in a transaction database. Since its introduction, the paradigm of frequent pattern mining has undergone a shift from candidate generation-and-test based approaches to projection based approaches. Co-location patterns resemble frequent patterns in many aspects. However, the lack of transaction concept, which is crucial in frequent pattern mining, … more

Date: May 2005

Creator: Yu, Ping

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Bayesian Probabilistic Reasoning Applied to Mathematical Epidemiology for Predictive Spatiotemporal Analysis of Infectious Diseases

Abstract Probabilistic reasoning under uncertainty suits well to analysis of disease dynamics. The stochastic nature of disease progression is modeled by applying the principles of Bayesian learning. Bayesian learning predicts the disease progression, including prevalence and incidence, for a geographic region and demographic composition. Public health resources, prioritized by the order of risk levels of the population, will efficiently minimize the disease spread and curtail the epidemic at … more

Date: May 2006

Creator: Abbas, Kaja Moinudeen

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Natural Language Interfaces to Databases

Natural language interfaces to databases (NLIDB) are systems that aim to bridge the gap between the languages used by humans and computers, and automatically translate natural language sentences to database queries. This thesis proposes a novel approach to NLIDB, using graph-based models. The system starts by collecting as much information as possible from existing databases and sentences, and transforms this information into a knowledge base for the system. Given a new question, the system wil… more

Date: December 2006

Creator: Chandra, Yohan

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Comparative Study of RSS-Based Collaborative Localization Methods in Wireless Sensor Networks

In this thesis two collaborative localization techniques are studied: multidimensional scaling (MDS) and maximum likelihood estimator (MLE). A synthesis of a new location estimation method through a serial integration of these two techniques, such that an estimate is first obtained using MDS and then MLE is employed to fine-tune the MDS solution, was the subject of this research using various simulation and experimental studies. In the simulations, important issues including the effects of sens… more

Date: December 2006

Creator: Koneru, Avanthi

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Mediation on XQuery Views

The major goal of information integration is to provide efficient and easy-to-use access to multiple heterogeneous data sources with a single query. At the same time, one of the current trends is to use standard technologies for implementing solutions to complex software problems. In this dissertation, I used XML and XQuery as the standard technologies and have developed an extended projection algorithm to provide a solution to the information integration problem. In order to demonstrate my sol… more

Date: December 2006

Creator: Peng, Xiaobo

Item Type: Thesis or Dissertation

Partner: UNT Libraries

A Language and Visual Interface to Specify Complex Spatial Pattern Mining

The emerging interests in spatial pattern mining leads to the demand for a flexible spatial pattern mining language, on which easy to use and understand visual pattern language could be built. It is worthwhile to define a pattern mining language called LCSPM to allow users to specify complex spatial patterns. I describe a proposed pattern mining language in this paper. A visual interface which allows users to specify the patterns visually is developed. Visual pattern queries are translated into… more

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Date: December 2006

Creator: Li, Xiaohui

Item Type: Thesis or Dissertation

Partner: UNT Libraries

A Netcentric Scientific Research Repository

The Internet and networks in general have become essential tools for disseminating in-formation. Search engines have become the predominant means of finding information on the Web and all other data repositories, including local resources. Domain scientists regularly acquire and analyze images generated by equipment such as microscopes and cameras, resulting in complex image files that need to be managed in a convenient manner. This type of integrated environment has been recently termed a netc… more

Access: Restricted to the UNT Community Members at a UNT Libraries Location.

Date: December 2006

Creator: Harrington, Brian

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Developing a Wildlife Tracking Extension for ArcGIS

Wildlife tracking is an essential task to gain better understanding of the migration pattern and use of space of the wildlife. Advances in computer technology and global positioning systems (GPS) have lowered costs, reduced processing time, and improved accuracy for tracking wild animals. In this thesis, a wildlife tracking extension is developed for ArcGIS 9.x, which allows biologists and ecologists to effectively track, visualize and analyze the movement patterns of wild animals. The extensio… more

Date: May 2009

Creator: Chen, Cai

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Computational Epidemiology - Analyzing Exposure Risk: A Deterministic, Agent-Based Approach

Many infectious diseases are spread through interactions between susceptible and infectious individuals. Keeping track of where each exposure to the disease took place, when it took place, and which individuals were involved in the exposure can give public health officials important information that they may use to formulate their interventions. Further, knowing which individuals in the population are at the highest risk of becoming infected with the disease may prove to be a useful tool for pu… more

Date: August 2009

Creator: O'Neill, Martin Joseph, II

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Survey of Approximation Algorithms for Set Cover Problem

In this thesis, I survey 11 approximation algorithms for unweighted set cover problem. I have also implemented the three algorithms and created a software library that stores the code I have written. The algorithms I survey are: 1. Johnson's standard greedy; 2. f-frequency greedy; 3. Goldsmidt, Hochbaum and Yu's modified greedy; 4. Halldorsson's local optimization; 5. Dur and Furer semi local optimization; 6. Asaf Levin's improvement to Dur and Furer; 7. Simple rounding; 8. Randomized rounding;… more

Date: December 2009

Creator: Dutta, Himanshu Shekhar

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Design and Implementation of Large-Scale Wireless Sensor Networks for Environmental Monitoring Applications

Environmental monitoring represents a major application domain for wireless sensor networks (WSN). However, despite significant advances in recent years, there are still many challenging issues to be addressed to exploit the full potential of the emerging WSN technology. In this dissertation, we introduce the design and implementation of low-power wireless sensor networks for long-term, autonomous, and near-real-time environmental monitoring applications. We have developed an out-of-box solutio… more

Date: May 2010

Creator: Yang, Jue

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

A New Wireless Sensor Node Design for Program Isolation and Power Flexibility

Over-the-air programming systems for wireless sensor networks have drawbacks that stem from fundamental limitations in the hardware used in current sensor nodes. Also, advances in technology make it feasible to use capacitors as the sole energy storage mechanism for sensor nodes using energy harvesting, but most current designs require additional electronics. These two considerations led to the design of a new sensor node. A microcontroller was chosen that meets the Popek and Goldberg virtualiz… more

Date: December 2009

Creator: Skelton, Adam W.

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

A Framework for Analyzing and Optimizing Regional Bio-Emergency Response Plans

The presence of naturally occurring and man-made public health threats necessitate the design and implementation of mitigation strategies, such that adequate response is provided in a timely manner. Since multiple variables, such as geographic properties, resource constraints, and government mandated time-frames must be accounted for, computational methods provide the necessary tools to develop contingency response plans while respecting underlying data and assumptions. A typical response sc… more

Date: December 2010

Creator: Schneider, Tamara

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

A Wireless Traffic Surveillance System Using Video Analytics

Video surveillance systems have been commonly used in transportation systems to support traffic monitoring, speed estimation, and incident detection. However, there are several challenges in developing and deploying such systems, including high development and maintenance costs, bandwidth bottleneck for long range link, and lack of advanced analytics. In this thesis, I leverage current wireless, video camera, and analytics technologies, and present a wireless traffic monitoring system. I first … more

Date: May 2011

Creator: Luo, Ning

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Toward a Data-Type-Based Real Time Geospatial Data Stream Management System

The advent of sensory and communication technologies enables the generation and consumption of large volumes of streaming data. Many of these data streams are geo-referenced. Existing spatio-temporal databases and data stream management systems are not capable of handling real time queries on spatial extents. In this thesis, we investigated several fundamental research issues toward building a data-type-based real time geospatial data stream management system. The thesis makes contributions in … more

Date: May 2011

Creator: Zhang, Chengyang

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Physical-Layer Network Coding for MIMO Systems

The future wireless communication systems are required to meet the growing demands of reliability, bandwidth capacity, and mobility. However, as corruptions such as fading effects, thermal noise, are present in the channel, the occurrence of errors is unavoidable. Motivated by this, the work in this dissertation attempts to improve the system performance by way of exploiting schemes which statistically reduce the error rate, and in turn boost the system throughput. The network can be studied us… more

Date: May 2011

Creator: Xu, Ning

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Exploring Privacy in Location-based Services Using Cryptographic Protocols

Location-based services (LBS) are available on a variety of mobile platforms like cell phones, PDA's, etc. and an increasing number of users subscribe to and use these services. Two of the popular models of information flow in LBS are the client-server model and the peer-to-peer model, in both of which, existing approaches do not always provide privacy for all parties concerned. In this work, I study the feasibility of applying cryptographic protocols to design privacy-preserving solutions for … more

Date: May 2011

Creator: Vishwanathan, Roopa

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

The Design Of A Benchmark For Geo-stream Management Systems

The recent growth in sensor technology allows easier information gathering in real-time as sensors have grown smaller, more accurate, and less expensive. The resulting data is often in a geo-stream format continuously changing input with a spatial extent. Researchers developing geo-streaming management systems (GSMS) require a benchmark system for evaluation, which is currently lacking. This thesis presents GSMark, a benchmark for evaluating GSMSs. GSMark provides a data generator that creates … more

Date: December 2011

Creator: Shen, Chao

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

GPS CaPPture: a System for GPS Trajectory Collection, Processing, and Destination Prediction

In the United States, smartphone ownership surpassed 69.5 million in February 2011 with a large portion of those users (20%) downloading applications (apps) that enhance the usability of a device by adding additional functionality. a large percentage of apps are written specifically to utilize the geographical position of a mobile device. One of the prime factors in developing location prediction models is the use of historical data to train such a model. with larger sets of training data, pred… more

Date: May 2012

Creator: Griffin, Terry W.

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Multi-perspective, Multi-modal Image Registration and Fusion

Multi-modal image fusion is an active research area with many civilian and military applications. Fusion is defined as strategic combination of information collected by various sensors from different locations or different types in order to obtain a better understanding of an observed scene or situation. Fusion of multi-modal images cannot be completed unless these two modalities are spatially aligned. In this research, I consider two important problems. Multi-modal, multi-perspective image reg… more

Date: August 2012

Creator: Belkhouche, Mohammed Yassine

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

A Smooth-turn Mobility Model for Airborne Networks

In this article, I introduce a novel airborne network mobility model, called the Smooth Turn Mobility Model, that captures the correlation of acceleration for airborne vehicles across time and spatial coordinates. E?ective routing in airborne networks (ANs) relies on suitable mobility models that capture the random movement pattern of airborne vehicles. As airborne vehicles cannot make sharp turns as easily as ground vehicles do, the widely used mobility models for Mobile Ad Hoc Networks such a… more

Date: August 2012

Creator: He, Dayin

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Automated Real-time Objects Detection in Colonoscopy Videos for Quality Measurements

The effectiveness of colonoscopy depends on the quality of the inspection of the colon. There was no automated measurement method to evaluate the quality of the inspection. This thesis addresses this issue by investigating an automated post-procedure quality measurement technique and proposing a novel approach automatically deciding a percentage of stool areas in images of digitized colonoscopy video files. It involves the classification of image pixels based on their color features using a new… more

Date: August 2013

Creator: Kumara, Muthukudage Jayantha

Item Type: Thesis or Dissertation

Partner: UNT Libraries