UNT Libraries - 281 Matching Results

Search Results

prev Results: 73 - 96 next
open access

Anchor Nodes Placement for Effective Passive Localization

Description: Wireless sensor networks are composed of sensor nodes, which can monitor an environment and observe events of interest. These networks are applied in various fields including but not limited to environmental, industrial and habitat monitoring. In many applications, the exact location of the sensor nodes is unknown after deployment. Localization is a process used to find sensor node's positional coordinates, which is vital information. The localization is generally assisted by anchor nodes that … more
Date: August 2010
Creator: Pasupathy, Karthikeyan
Item Type: Refine your search to only Thesis or Dissertation
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
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
open access

Exploring Process-Variation Tolerant Design of Nanoscale Sense Amplifier Circuits

Description: Sense amplifiers are important circuit components of a dynamic random access memory (DRAM), which forms the main memory of digital computers. The ability of the sense amplifier to detect and amplify voltage signals to correctly interpret data in DRAM cells cannot be understated. The sense amplifier plays a significant role in the overall speed of the DRAM. Sense amplifiers require matched transistors for optimal performance. Hence, the effects of mismatch through process variations must be mini… more
Date: December 2010
Creator: Okobiah, Oghenekarho
Item Type: Refine your search to only Thesis or Dissertation
open access

Process-Voltage-Temperature Aware Nanoscale Circuit Optimization

Description: Embedded systems which are targeted towards portable applications are required to have low power consumption because such portable devices are typically powered by batteries. During the memory accesses of such battery operated portable systems, including laptops, cell phones and other devices, a significant amount of power or energy is consumed which significantly affects the battery life. Therefore, efficient and leakage power saving cache designs are needed for longer operation of battery pow… more
Date: December 2010
Creator: Thakral, Garima
Item Type: Refine your search to only Thesis or Dissertation
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
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
open access

Physical-Layer Network Coding for MIMO Systems

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

Exploring Privacy in Location-based Services Using Cryptographic Protocols

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

Joint Schemes for Physical Layer Security and Error Correction

Description: The major challenges facing resource constraint wireless devices are error resilience, security and speed. Three joint schemes are presented in this research which could be broadly divided into error correction based and cipher based. The error correction based ciphers take advantage of the properties of LDPC codes and Nordstrom Robinson code. A cipher-based cryptosystem is also presented in this research. The complexity of this scheme is reduced compared to conventional schemes. The securities… more
Date: August 2011
Creator: Adamo, Oluwayomi Bamidele
Item Type: Refine your search to only Thesis or Dissertation
open access

Measuring Semantic Relatedness Using Salient Encyclopedic Concepts

Description: While pragmatics, through its integration of situational awareness and real world relevant knowledge, offers a high level of analysis that is suitable for real interpretation of natural dialogue, semantics, on the other end, represents a lower yet more tractable and affordable linguistic level of analysis using current technologies. Generally, the understanding of semantic meaning in literature has revolved around the famous quote ``You shall know a word by the company it keeps''. In this thes… more
Date: August 2011
Creator: Hassan, Samer
Item Type: Refine your search to only Thesis or Dissertation
open access

Scene Analysis Using Scale Invariant Feature Extraction and Probabilistic Modeling

Description: Conventional pattern recognition systems have two components: feature analysis and pattern classification. For any object in an image, features could be considered as the major characteristic of the object either for object recognition or object tracking purpose. Features extracted from a training image, can be used to identify the object when attempting to locate the object in a test image containing many other objects. To perform reliable scene analysis, it is important that the features extr… more
Date: August 2011
Creator: Shen, Yao
Item Type: Refine your search to only Thesis or Dissertation
open access

Indoor Localization Using Magnetic Fields

Description: Indoor localization consists of locating oneself inside new buildings. GPS does not work indoors due to multipath reflection and signal blockage. WiFi based systems assume ubiquitous availability and infrastructure based systems require expensive installations, hence making indoor localization an open problem. This dissertation consists of solving the problem of indoor localization by thoroughly exploiting the indoor ambient magnetic fields comprising mainly of disturbances termed as anomalies … more
Date: December 2011
Creator: Pathapati Subbu, Kalyan Sasidhar
Item Type: Refine your search to only Thesis or Dissertation
open access

The Design Of A Benchmark For Geo-stream Management Systems

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

Investigating the Extractive Summarization of Literary Novels

Description: Abstract Due to the vast amount of information we are faced with, summarization has become a critical necessity of everyday human life. Given that a large fraction of the electronic documents available online and elsewhere consist of short texts such as Web pages, news articles, scientific reports, and others, the focus of natural language processing techniques to date has been on the automation of methods targeting short documents. We are witnessing however a change: an increasingly larger n… more
Date: December 2011
Creator: Ceylan, Hakan
Item Type: Refine your search to only Thesis or Dissertation
open access

Metamodeling-based Fast Optimization of Nanoscale Ams-socs

Description: Modern consumer electronic systems are mostly based on analog and digital circuits and are designed as analog/mixed-signal systems on chip (AMS-SoCs). the integration of analog and digital circuits on the same die makes the system cost effective. in AMS-SoCs, analog and mixed-signal portions have not traditionally received much attention due to their complexity. As the fabrication technology advances, the simulation times for AMS-SoC circuits become more complex and take significant amounts of … more
Date: May 2012
Creator: Garitselov, Oleg
Item Type: Refine your search to only Thesis or Dissertation
open access

A Driver, Vehicle and Road Safety System Using Smartphones

Description: As vehicle manufacturers continue to increase their emphasis on safety with advanced driver assistance systems (ADAS), I propose a ubiquitous device that is able to analyze and advise on safety conditions. Mobile smartphones are increasing in popularity among younger generations with an estimated 64% of 25-34 year olds already using one in their daily lives. with over 10 million car accidents reported in the United States each year, car manufacturers have shifted their focus of a passive approa… more
Date: May 2012
Creator: Gozick, Brandon
Item Type: Refine your search to only Thesis or Dissertation
open access

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

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

Rapid Prototyping and Design of a Fast Random Number Generator

Description: Information in the form of online multimedia, bank accounts, or password usage for diverse applications needs some form of security. the core feature of many security systems is the generation of true random or pseudorandom numbers. Hence reliable generators of such numbers are indispensable. the fundamental hurdle is that digital computers cannot generate truly random numbers because the states and transitions of digital systems are well understood and predictable. Nothing in a digital compute… more
Date: May 2012
Creator: Franco, Juan
Item Type: Refine your search to only Thesis or Dissertation
open access

A Global Stochastic Modeling Framework to Simulate and Visualize Epidemics

Description: Epidemics have caused major human and monetary losses through the course of human civilization. It is very important that epidemiologists and public health personnel are prepared to handle an impending infectious disease outbreak. the ever-changing demographics, evolving infrastructural resources of geographic regions, emerging and re-emerging diseases, compel the use of simulation to predict disease dynamics. By the means of simulation, public health personnel and epidemiologists can predict t… more
Date: May 2012
Creator: Indrakanti, Saratchandra
Item Type: Refine your search to only Thesis or Dissertation
open access

Cuff-less Blood Pressure Measurement Using a Smart Phone

Description: Blood pressure is vital sign information that physicians often need as preliminary data for immediate intervention during emergency situations or for regular monitoring of people with cardiovascular diseases. Despite the availability of portable blood pressure meters in the market, they are not regularly carried by people, creating a need for an ultra-portable measurement platform or device that can be easily carried and used at all times. One such device is the smartphone which, according to c… more
Date: May 2012
Creator: Jonnada, Srikanth
Item Type: Refine your search to only Thesis or Dissertation
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
open access

Incremental Learning with Large Datasets

Description: This dissertation focuses on the novel learning strategy based on geometric support vector machines to address the difficulties of processing immense data set. Support vector machines find the hyper-plane that maximizes the margin between two classes, and the decision boundary is represented with a few training samples it becomes a favorable choice for incremental learning. The dissertation presents a novel method Geometric Incremental Support Vector Machines (GISVMs) to address both efficiency… more
Date: May 2012
Creator: Giritharan, Balathasan
Item Type: Refine your search to only Thesis or Dissertation
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
Back to Top of Screen