UNT Theses and Dissertations - 237 Matching Results

Search Results

prev Results: 191 - 214 next
open access

3D Reconstruction Using Lidar and Visual Images

Description: In this research, multi-perspective image registration using LiDAR and visual images was considered. 2D-3D image registration is a difficult task because it requires the extraction of different semantic features from each modality. This problem is solved in three parts. The first step involves detection and extraction of common features from each of the data sets. The second step consists of associating the common features between two different modalities. Traditional methods use lines or ortho… more
Date: December 2012
Creator: Duraisamy, Prakash
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

A Programming Language For Concurrent Processing

Description: This thesis is a proposed solution to the problem of including an effective interrupt mechanism in the set of concurrent- processing primitives of a block-structured programming language or system. The proposed solution is presented in the form of a programming language definition and model. The language is called TRIPLE.
Date: August 1972
Creator: Jackson, Portia M.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Multi-perspective, Multi-modal Image Registration and Fusion

Description: 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: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

A Smooth-turn Mobility Model for Airborne Networks

Description: 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: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Automatic Tagging of Communication Data

Description: Globally distributed software teams are widespread throughout industry. But finding reliable methods that can properly assess a team's activities is a real challenge. Methods such as surveys and manual coding of activities are too time consuming and are often unreliable. Recent advances in information retrieval and linguistics, however, suggest that automated and/or semi-automated text classification algorithms could be an effective way of finding differences in the communication patterns among… more
Date: August 2012
Creator: Hoyt, Matthew Ray
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

A Wireless Traffic Surveillance System Using Video Analytics

Description: 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: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Techniques for Improving Uniformity in Direct Mapped Caches

Description: Directly mapped caches are an attractive option for processor designers as they combine fast lookup times with reduced complexity and area. However, directly-mapped caches are prone to higher miss-rates as there are no candidates for replacement on a cache miss, hence data residing in a cache set would have to be evicted to the next level cache. Another issue that inhibits cache performance is the non-uniformity of accesses exhibited by most applications: some sets are under-utilized while othe… more
Date: May 2011
Creator: Nwachukwu, Izuchukwu Udochi
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

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

Description: 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: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Graph-Based Keyphrase Extraction Using Wikipedia

Description: Keyphrases describe a document in a coherent and simple way, giving the prospective reader a way to quickly determine whether the document satisfies their information needs. The pervasion of huge amount of information on Web, with only a small amount of documents have keyphrases extracted, there is a definite need to discover automatic keyphrase extraction systems. Typically, a document written by human develops around one or more general concepts or sub-concepts. These concepts or sub-concepts… more
Date: December 2010
Creator: Dandala, Bharath
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

General Purpose Computing in Gpu - a Watermarking Case Study

Description: The purpose of this project is to explore the GPU for general purpose computing. The GPU is a massively parallel computing device that has a high-throughput, exhibits high arithmetic intensity, has a large market presence, and with the increasing computation power being added to it each year through innovations, the GPU is a perfect candidate to complement the CPU in performing computations. The GPU follows the single instruction multiple data (SIMD) model for applying operations on its data.… more
Date: August 2014
Creator: Hanson, Anthony
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

A Comparison of File Organization Techniques

Description: This thesis compares the file organization techniques that are implemented on two different types of computer systems, the large-scale and the small-scale. File organizations from representative computers in each class are examined in detail: the IBM System/370 (OS/370) and the Harris 1600 Distributed Processing System with the Extended Communications Operating System (ECOS). In order to establish the basic framework for comparison, an introduction to file organizations is presented. Additional… more
Date: August 1977
Creator: Rogers, Roy Lee
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Information Storage and Retrieval Systems

Description: This thesis describes the implementation of a general purpose personal information storage and retrieval system. Chapter one contains an introduction to information storage and retrieval. Chapter two contains a description of the features a useful personal information retrieval system should contain. This description forms the basis for the implementation of the personal information storage and retrieval system described in chapter three. The system is implemented in UCSD Pascal on an Apple II … more
Date: May 1983
Creator: Creech, Teresa Adams
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

An Interpreter for the Basic Programming Language

Description: In this thesis, the first chapter provides the general description of this interpreter. The second chapter contains a formal definition of the syntax of BASIC along with an introduction to the semantics. The third chapter contains the design of data structure. The fourth chapter contains the description of algorithms along with stages for testing the interpreter and the design of debug output. The stages and actions-are represented internally to the computer in tabular forms. For statement pars… more
Date: May 1975
Creator: Chang, Min-Jye S.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

A Design Approach for Digital Computer Peripheral Controllers, Case Study Design and Construction

Description: The purpose of this project was to describe a novel design approach for a digital computer peripheral controller, then design and construct a case study controller. This document consists of three chapters and an appendix. Chapter II presents the design approach chosen; a variation to a design presented by Charles R. Richards in an article published in Electronics magazine. Richards' approach consists of a finite state machine circuitry controlling all the functions of a controller. The variat… more
Date: May 1976
Creator: Cabrera, A. L.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Performance Analysis of Wireless Networks with QoS Adaptations

Description: The explosive demand for multimedia and fast transmission of continuous media on wireless networks means the simultaneous existence of traffic requiring different qualities of service (QoS). In this thesis, several efficient algorithms have been developed which offer several QoS to the end-user. We first look at a request TDMA/CDMA protocol for supporting wireless multimedia traffic, where CDMA is laid over TDMA. Then we look at a hybrid push-pull algorithm for wireless networks, and present a … more
Date: August 2003
Creator: Dash, Trivikram
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Performance Evaluation of Data Integrity Mechanisms for Mobile Agents

Description: With the growing popularity of e-commerce applications that use software agents, the protection of mobile agent data has become imperative. To that end, the performance of four methods that protect the data integrity of mobile agents is evaluated. The methods investigated include existing approaches known as the Partial Result Authentication Codes, Hash Chaining, and Set Authentication Code methods, and a technique of our own design, called the Modified Set Authentication Code method, which add… more
Access: Restricted to UNT Community Members. Login required if off-campus.
Date: December 2003
Creator: Gunupudi, Vandana
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Embedded monitors for detecting and preventing intrusions in cryptographic and application protocols.

Description: There are two main approaches for intrusion detection: signature-based and anomaly-based. Signature-based detection employs pattern matching to match attack signatures with observed data making it ideal for detecting known attacks. However, it cannot detect unknown attacks for which there is no signature available. Anomaly-based detection builds a profile of normal system behavior to detect known and unknown attacks as behavioral deviations. However, it has a drawback of a high false alarm rate… more
Date: December 2003
Creator: Joglekar, Sachin P.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

XML-Based Agent Scripts and Inference Mechanisms

Description: Natural language understanding has been a persistent challenge to researchers in various computer science fields, in a number of applications ranging from user support systems to entertainment and online teaching. A long term goal of the Artificial Intelligence field is to implement mechanisms that enable computers to emulate human dialogue. The recently developed ALICEbots, virtual agents with underlying AIML scripts, by A.L.I.C.E. foundation, use AIML scripts - a subset of XML - as the underl… more
Date: August 2003
Creator: Sun, Guili
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Improved Approximation Algorithms for Geometric Packing Problems With Experimental Evaluation

Description: Geometric packing problems are NP-complete problems that arise in VLSI design. In this thesis, we present two novel algorithms using dynamic programming to compute exactly the maximum number of k x k squares of unit size that can be packed without overlap into a given n x m grid. The first algorithm was implemented and ran successfully on problems of large input up to 1,000,000 nodes for different values. A heuristic based on the second algorithm is implemented. This heuristic is fast in p… more
Access: Restricted to UNT Community Members. Login required if off-campus.
Date: December 2003
Creator: Song, Yongqiang
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

An Analysis of Motivational Cues in Virtual Environments.

Description: Guiding navigation in virtual environments (VEs) is a challenging task. A key issue in the navigation of a virtual environment is to be able to strike a balance between the user's need to explore the environment freely and the designer's need to ensure that the user experiences all the important events in the VE. This thesis reports on a study aimed at comparing the effectiveness of various navigation cues that are used to motivate users towards a specific target location. The results of this s… more
Access: Restricted to UNT Community Members. Login required if off-campus.
Date: December 2003
Creator: Voruganti, Lavanya
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Resource Efficient and Scalable Routing using Intelligent Mobile Agents

Description: Many of the contemporary routing algorithms use simple mechanisms such as flooding or broadcasting to disseminate the routing information available to them. Such routing algorithms cause significant network resource overhead due to the large number of messages generated at each host/router throughout the route update process. Many of these messages are wasteful since they do not contribute to the route discovery process. Reducing the resource overhead may allow for several algorithms to be depl… more
Date: May 2003
Creator: Amin, Kaizar Abdul Husain
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Routing Optimization in Wireless Ad Hoc and Wireless Sensor Networks

Description: Wireless ad hoc networks are expected to play an important role in civilian and military settings where wireless access to wired backbone is either ineffective or impossible. Wireless sensor networks are effective in remote data acquisition. Congestion control and power consumption in wireless ad hoc networks have received a lot of attention in recent research. Several algorithms have been proposed to reduce congestion and power consumption in wireless ad hoc and sensor networks. In this thesis… more
Access: Restricted to UNT Community Members. Login required if off-campus.
Date: August 2003
Creator: Joseph, Linus
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Agent Extensions for Peer-to-Peer Networks.

Description: Peer-to-Peer (P2P) networks have seen tremendous growth in development and usage in recent times. This attention has brought many developments as well as new challenges to these networks. We will show that agent extensions to P2P networks offer solutions to many problems faced by P2P networks. In this research, an attempt is made to bring together JXTA P2P infrastructure and Jinni, a Prolog based agent engine to form an agent based P2P network. On top of the JXTA, we define simple Java API prov… more
Date: December 2003
Creator: Valiveti, Kalyan
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

3GPP Long Term Evolution LTE Scheduling

Description: Future generation cellular networks are expected to deliver an omnipresent broadband access network for an endlessly increasing number of subscribers. Long term Evolution (LTE) represents a significant milestone towards wireless networks known as 4G cellular networks. A key feature of LTE is the implementation of enhanced Radio Resource Management (RRM) mechanism to improve the system performance. The structure of LTE networks was simplified by diminishing the number of the nodes of the core ne… more
Date: December 2013
Creator: Alotaibi, Sultan
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
Back to Top of Screen