You limited your search to:

  Partner: UNT Libraries
Joint Schemes for Physical Layer Security and Error Correction

Joint Schemes for Physical Layer Security and Error Correction

Date: August 2011
Creator: Adamo, Oluwayomi Bamidele
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 of the ciphers are analyzed against known-plaintext and chosen-plaintext attacks and are found to be secure. Randomization test was also conducted on these schemes and the results are presented. For the proof of concept, the schemes were implemented in software and hardware and these shows a reduction in hardware usage compared to conventional schemes. As a result, joint schemes for error correction and security provide security to the physical layer of wireless communication systems, a layer in the protocol stack where currently little or no security is implemented. In this physical layer security approach, the properties of powerful error correcting codes are exploited to deliver reliability to the intended parties, high security against eavesdroppers and efficiency in communication system. The notion of a highly secure and reliable ...
Contributing Partner: UNT Libraries
The Effects of Capturing and Searching on the Acquisition of a Simple Arm Position

The Effects of Capturing and Searching on the Acquisition of a Simple Arm Position

Date: August 2011
Creator: Heth, Travis R.
Description: The present experiment compared two methods of training a simple arm position using auditory feedback: capture and search. The participants were four right-handed female college students. During capture, auditory feedback was delivered by the experimenter after the participant moved along a single axis into the target position. During search, auditory feedback was produced by the computer after the participant left clicked a mouse inside the target location. The results of a multi-element design showed that participants performed more accurately during capture training than search training. Pre-training and post-training probes, during which no auditory feedback was provided, showed similar fluctuations in accuracy across probe types. A retention check, performed seven days after the final training session, showed higher accuracy scores for search than capture, across all four participants. These findings suggest that TAGteach should incorporate an approach similar to search training to improve training outcomes.
Contributing Partner: UNT Libraries
Measuring Semantic Relatedness Using Salient Encyclopedic Concepts

Measuring Semantic Relatedness Using Salient Encyclopedic Concepts

Date: August 2011
Creator: Hassan, Samer
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 thesis we investigate the role of context constituents in decoding the semantic meaning of the engulfing context; specifically we probe the role of salient concepts, defined as content-bearing expressions which afford encyclopedic definitions, as a suitable source of semantic clues to an unambiguous interpretation of context. Furthermore, we integrate this world knowledge in building a new and robust unsupervised semantic model and apply it to entail semantic relatedness between textual pairs, whether they are words, sentences or paragraphs. Moreover, we explore the abstraction of semantics across languages and utilize our findings into building a novel multi-lingual semantic relatedness model exploiting information acquired from various languages. We demonstrate the effectiveness and the superiority of our mono-lingual and multi-lingual models through a comprehensive set of evaluations on specialized ...
Contributing Partner: UNT Libraries
Modeling Place Vulnerability of HIV/AIDS in Texas

Modeling Place Vulnerability of HIV/AIDS in Texas

Date: August 2011
Creator: Harold, Adam F.
Description: This study provides a measurable model of the concept of place vulnerability for HIV/AIDS that incorporates both community and structural level effects using data provided at the ZIP code level from the Texas Department of State Health Services. Sociological literature on the effects of place on health has been growing but falls short of providing an operational definition of the effects of place on health. This dissertation looks to the literature in medical/health geography to supplement sociology’s understanding of the effects of place on health, to the end of providing a measurable model. Prior research that has recognized the complexity of the effects of place still have forced data into one scale and emphasized individual-level outcomes. A multilevel model allows for keeping the associated spatial unit data, without aggregating or parsing it out for convenience of model fit. The place vulnerability model proposed examines how exposure, capacity and potentiality variables all influence an area’s HIV/AIDS count. To capture the effects of place vulnerability at multiple levels, this dissertation research uses a multilevel zero-inflated poisson (MLZIP) model to examine how factors measured at the ZIP code and county both affect HIV/AIDS counts per ZIP code as an outcome. Furthermore, empirical Bayes ...
Contributing Partner: UNT Libraries
NNS Use of Adverbs in Academic Writing

NNS Use of Adverbs in Academic Writing

Date: August 2011
Creator: Heidler, Linda E.
Description: Recent studies have begun to redefine the idea of accuracy in second language acquisition to include not only grammatical correctness, but also native-like selection. This is an exploratory study aimed at identifying areas of nonnative-like selection of adverbs, such as sentence position, semantic category preferences, frequency of use and breadth of word choice. Using corpus-linguistic methods it compares the writing of nonnative English speakers at an intermediate and advanced level to both American college students’ writing and published academic writing. It also conducts in-depth case studies of three of the most commonly used adverbs. It finds that while advanced students are grammatically accurate, there are still several ways in which their use of adverbs differs from that of native speakers.
Contributing Partner: UNT Libraries
Re-Purposing of Freely Available Government Documents

Re-Purposing of Freely Available Government Documents

Date: July 23, 2011
Creator: Phillips, Mark Edward
Description: This presentation discusses the re-purposing of freely available government documents. It specifically describes projects by the University of North Texas Libraries including The Portal to Texas History, collections in the UNT Digital Library, newspaper projects, and the digitization of maps.
Contributing Partner: UNT Libraries
7.5 Minute Quadrangle Project

7.5 Minute Quadrangle Project

Date: October 18, 2010
Creator: Phillips, Mark Edward
Description: Presentation for the 2010 Depository Library Council Annual Meeting. This presentation discusses the 7.5 minute quadrangle project by the University of North Texas (UNT) Libraries' Digital Projects Unit and gives the background, goals, processes, challenges, and next steps.
Contributing Partner: UNT Libraries
PREMIS Event Service

PREMIS Event Service

Date: June 9, 2011
Creator: Phillips, Mark Edward; Schultz, Matt & Nordstrom, Kurt
Description: This presentation discusses the PREMIS Event Service. The University of North Texas (UNT) Libraries has created a digital library infrastructure that is designed using the Curation Micro Services methodology for building repositories. Based on modular components designed for reuse and re-configuration the authors propose a general-purpose preservation event logging system using the PREMIS Event and Agent data model.
Contributing Partner: UNT Libraries
Getting ETDs off the Calf-Path: Digital Preservation Readiness for Growing ETD Collections and Distributed Preservation Networks

Getting ETDs off the Calf-Path: Digital Preservation Readiness for Growing ETD Collections and Distributed Preservation Networks

Date: June 11, 2009
Creator: McMillan, Gail & Halbert, Martin
Description: This presentation addresses "Calf-Path" problems for Electronic Theses and Dissertation (ETD) repositories, problems associated with the early ad hoc and idiosyncratic workflow patterns. This presentation also documents relatively simple principles and guidelines for such ETD programs that can greatly improve the subsequent likelihood of implementing successful distributed digital preservation programs.
Contributing Partner: UNT Libraries
Collection Development and Management Issues

Collection Development and Management Issues

Date: July 23, 2011
Creator: Phillips, Mark Edward
Description: This presentation discusses collection development and management issues. It describes considerations to keep in mind, suggestions and strategies, and ideas for successful digitization projects.
Contributing Partner: UNT Libraries