An Investigation Into The Effect Of Blood Glucose Level Changes On Lf/Hf Parameter Of Hrv Signal In Non-Diabetic And Diabetic Individuals, 2011 University of Texas at El Paso
An Investigation Into The Effect Of Blood Glucose Level Changes On Lf/Hf Parameter Of Hrv Signal In Non-Diabetic And Diabetic Individuals, Reza M. Amanipour
Open Access Theses & Dissertations
The analysis of time duration between consecutive R waves of electrocardiogram (ECG) is a standard method to evaluate the variations in heart rate. The physiological literature reveals that blood glucose levels modulate the autonomic nervous system (ANS) activity and heart rate variability (HRV) is representative of the cardiovascular autonomic function. In the research, an investigation was carried out to investigate the relationship between HRV signal measures derived from ECG and arterial blood glucose changes in five non-diabetic and five diabetic individuals during normoglycemic and mildly hyperglycemic conditions. A CleveLabs BioCapture wireless device was used to acquire ECG signals from ten …
Preparation And Characterization Of Iron Oxide And Hydroxide Based Nanomaterials, 2011 University of Texas at El Paso
Preparation And Characterization Of Iron Oxide And Hydroxide Based Nanomaterials, Guillermo Carbajal Franco
Open Access Theses & Dissertations
Iron (Fe) oxides and hydroxides are common and abundant materials. They exhibit diverse crystal structures, properties and phenomena by virtue of which they find a wide range of scientific and technological applications. Controlled growth and manipulation of the specific structure and electronic behavior to meet the requirements of a given application is a challenging problem in view of many possible phases and composition of the resulting materials. The preparation method and experimental conditions will, therefore, significantly affect the properties and performance of Fe oxides and hydroxides. The goal of the project is to obtain Fe-based oxide/hydroxide catalytic materials and to …
A 1x4 Adaptive Optical Splitter Based On Opto-Vlsi Processor, 2011 Edith Cowan University
A 1x4 Adaptive Optical Splitter Based On Opto-Vlsi Processor, Haithem Mustafa, Feng Xiao, Kamal Alameh
Research outputs 2011
We propose and experimentally demonstrate a novel high resolution 1×4 adaptive optical power splitter based on the use of an Opto-VLSI processor and a 4-f imaging system with an optimized optical beam waist profile. By uploading optimized multicasting phase holograms onto the software-driven Opto-VLSI processor, an input optical signal is dynamically split into different output fiber ports with user-defined splitting ratios. Experimental results showing dynamic optical splitting over a wavelength range exceeding 50 nm are presented.
Column: Putting The Science In Digital Forensics, 2011 California Sciences Institute, Fred Cohen & Associates
Column: Putting The Science In Digital Forensics, Fred Cohen
Journal of Digital Forensics, Security and Law
In a recent study, digital forensics was found to lack a consensus around even the most basis notions and terminology of the field. To quote: “These two preliminary studies individually suggest that (1) scientific consensus in the area of digital forensic evidence examination is lacking in the broad sense, but that different groups within that overall community may have limited consensus around areas in which they have special expertise, and (2) that the current peerreviewed publication process is not acting to bring about the sorts of elements typically found in the advancement of a science toward such a consensus. ... …
Technology Corner: Internet Packet Sniffers, 2011 University of New Mexico
Technology Corner: Internet Packet Sniffers, Nick V. Flor, Kenneth Guillory
Journal of Digital Forensics, Security and Law
The best way to understand an internet packet sniffer, hereafter “packet sniffer”, is by analogy with a wiretap. A wiretap is a piece of hardware that allows a person to eavesdrop on phone conversations over a telephone network. Similarly, a packet sniffer is a piece of software that allows a person to eavesdrop on computer communications over the internet. A packet sniffer can be used as a diagnostic tool by network administrators or as a spying tool by hackers who can use it to steal passwords and other private information from computer users. Whether you are a network administrator or …
A Survey Of Contemporary Enterprise Storage Technologies From A Digital Forensics Perspective, 2011 California State Polytechnic University
A Survey Of Contemporary Enterprise Storage Technologies From A Digital Forensics Perspective, Gregory H. Carlton, Joseph Matsumoto
Journal of Digital Forensics, Security and Law
As the proliferation of digital computational systems continue to expand, increasingly complex technologies emerge, including those regarding large, enterprise-wide, information storage and retrieval systems. Within this study, we examine four contemporary enterprise storage technologies. Our examination of these technologies is presented with an overview of the technological features of each offering and then followed with a discussion of the impact of these technologies on digital forensics methods, particularly regarding forensic data acquisition. We offer a general opinion concerning a recommended data acquisition method when faced with the task of obtaining a forensic image of data contained within these technologies, we …
Technology Corner: Brute Force Password Generation -- Basic Iterative And Recursive Algorithms, 2011 University of New Mexico
Technology Corner: Brute Force Password Generation -- Basic Iterative And Recursive Algorithms, Nick V. Flor, Haile Shannon
Journal of Digital Forensics, Security and Law
Most information systems are secured at minimum by some form of password protection. For various reasons a password may be unavailable, requiring some form of password recovery procedure. One such procedure is software-based automated password recovery, where a program attempts to log into a system by repeatedly trying different password combinations. At the core of such software is a password generator. This article describes the basic iterative and recursive algorithms for generating all possible passwords of a given length, which is commonly referred to as brute-force password generation. The paper ends with a discussion of alternative password recovery procedures one …
Investigating Modern Communication Technologies: The Effect Of Internet-Based Communication Technologies On The Investigation Process, 2011 University of South Australia
Investigating Modern Communication Technologies: The Effect Of Internet-Based Communication Technologies On The Investigation Process, Matthew Simon, Jill Slay
Journal of Digital Forensics, Security and Law
Communication technologies are commonplace in modern society. For many years there were only a handful of communication technologies provided by large companies, namely the Public Switched Telephone Network (PSTN) and mobile telephony; these can be referred to as traditional communication technologies. Over the lifetime of traditional communication technologies has been little technological evolution and as such, law enforcement developed sound methods for investigating targets using them. With the advent of communication technologies that use the Internet – Internet-based or contemporary communication technologies – law enforcement are faced with many challenges. This paper discusses these challenges and their potential impact. It …
Table Of Contents, 2011 Embry-Riddle Aeronautical University
Table Of Contents
Journal of Digital Forensics, Security and Law
No abstract provided.
Molybdenum Nitride Films In The Back Contact Structure Of Flexible Substrate Cdte Solar Cells, 2011 University of South Florida
Molybdenum Nitride Films In The Back Contact Structure Of Flexible Substrate Cdte Solar Cells, Vasudha Guntur
USF Tampa Graduate Theses and Dissertations
CdTe solar cells in the superstrate configuration have achieved record efficiencies of 16% but those in the substrate configuration have reached efficiencies of only 7.8%. A major reason for the lower efficiency of substrate CdTe solar cells is the poor back contact. In this work, CdTe solar cells of the substrate configuration have been fabricated on flexible metallic substrates. For this type of devices, impurity diffusion out of stainless-steel substrates due to high temperature processing can be a cause for poor cell performance. It is necessary to investigate ways of improving the back contact by trying to mitigate the above …
Characterizing Wireless And Powerline Communication Channels With Applications To Smart Grid Networks, 2011 University of South Florida
Characterizing Wireless And Powerline Communication Channels With Applications To Smart Grid Networks, Sabih Guzelgoz
USF Tampa Graduate Theses and Dissertations
Smart grid aims at improving the efficiency, reliability, security, and quality of service (QoS) of the current electricity grid by exploiting the advances in communication and information technology. In parallel to size of the electricity grid, smart grid communication infrastructure should cover a very large geographical area that may extend from remote generation sites to densely populated residential regions and inside buildings, homes, and electricity-power-system environments. In such an extensive communication network, different communication technologies operating on different communication medium are likely to coexist. Among the communication technologies available, wireless and power line communication (PLC) based solutions are comparatively attractive …
Diamond Based-Materials: Synthesis, Characterization And Applications, 2011 University of South Florida
Diamond Based-Materials: Synthesis, Characterization And Applications, Qiang Hu
USF Tampa Graduate Theses and Dissertations
The studies covered in this dissertation concentrate on the various forms of diamond films synthesized by chemical vapor deposition (CVD) method, including microwave CVD and hot filament CVD. According to crystallinity and grain size, a variety of diamond forms primarily including microcrystalline (most commonly referred to as polycrystalline) and nanocrystalline diamond films, diamond-like carbon (DLC) films were successfully synthesized. The as-grown diamond films were optimized by changing deposition pressure, volume of reactant gas hydrogen (H2) and carrier gas argon (Ar) in order to get high-quality diamond films with a smooth surface, low roughness, preferred growth orientation and high sp3 bond …
Magneto-Dielectric Polymer Nanocomposite Engineered Substrate For Rf And Microwave Antennas, 2011 University of South Florida
Magneto-Dielectric Polymer Nanocomposite Engineered Substrate For Rf And Microwave Antennas, Cesar A. Morales
USF Tampa Graduate Theses and Dissertations
This dissertation presents the first reported systematic investigation on the implementation of multilayer patch antennas over Fe3O4-based polymer nanocomposite (PNC) magneto-dielectric substrates. The PNC substrate is created by the monodispersion of Fe3O4 nanopthesiss, with mean size of 7.5nm, in a polymeric matrix of Polydimethylsiloxane (PDMS).
Recently, magneto-dielectric substrates have been proposed by several researchers as a means for decreasing the size and increasing the bandwidth of planar antennas. Nevertheless, factors such as high loss and diminished control over magnetic and dielectric properties have hindered the optimal performance of antennas. In addition, the incompatibility and elevated complexity prevents integration of conventional …
Fabrication And Characterization Of Electrospun Cactus Mucilage Nanofibers, 2011 University of South Florida
Fabrication And Characterization Of Electrospun Cactus Mucilage Nanofibers, Yanay Pais
USF Tampa Graduate Theses and Dissertations
This work seeks to fabricate, optimize, and characterize nanofibers of cactus Opuntia ficus-indica mucilage and Poly (vinyl alcohol) (PVA) by electrospinning. Mucilage is a neutral mixture of sugars produced by cactus and PVA is a non-toxic, water-soluble, synthetic polymer, which is widely used as a co-spinning agent for polymers. Mucilage was extracted from the cactus pad and prepared for electrospinning by mixing with acetic acid. Two types of PVA were used differentiating in high and low molecular weights. Concentrations of PVA were varied to find an adequate threshold for fiber formation. Changing the ratio of PVA to cactus mucilage produced …
Novel Film Formation Pathways For Cu2znsnse4 For Solar Cell Applications, 2011 University of South Florida
Novel Film Formation Pathways For Cu2znsnse4 For Solar Cell Applications, Sree Satya Kanth Bendapudi
USF Tampa Graduate Theses and Dissertations
Because of the anticipated high demand for Indium, ongoing growth of CIGS technology may be limited. Kesterite materials, which replace In with a Zn/Sn couple, are thought to be a solution to this issue. However, efficiencies are still below the 10% level, and these materials are proving to be complex. Even determination of the bandgap is not settled because of the occurrence of secondary phases. We use a film growth process, 2SSS, which we believe helps control the formation of secondary phases. Under the right growth conditions we find 1/1 Zn/Sn ratios and XRD signatures for Cu2ZnSnSe4 with no evidence …
Smart Grid Functionality Of A Pv-Energy Storage System, 2011 University of South Florida
Smart Grid Functionality Of A Pv-Energy Storage System, Nenad Damnjanovic
USF Tampa Graduate Theses and Dissertations
Renewable Energy will be the key to preserving the Earth's remaining resources and continuing this surge of technological progress that we have experienced this past century. New philosophies of how/when/where energy should be consumed and produced are attempting to improve upon the current grid infrastructure. The massive advancement in communications, renewable and control systems will allow this new-age electric grid to maximize its efficiency while reducing cost. Renewable, "green" energy is now at the forefront of innovation. As the world population increases, there will be a need to free ourselves from natural resources as much as possible. Advanced Energy Storage …
Ultra-Low Power Electronics For Autonomous Micro-Sensor Applications, 2011 University of South Florida
Ultra-Low Power Electronics For Autonomous Micro-Sensor Applications, Rebeka Davidova
USF Tampa Graduate Theses and Dissertations
This thesis presented the research, design and fabrication associated with a unique application of rectenna technology combined with lock-in amplification. An extremely low-power harmonic transponder is conjoined with an interrogator base-station, and utilizing coherent demodulation the Remote Lock-In Amplifier (RLIA) concept is realized. Utilizing harmonic re-radiation with very low-power input, the 1st generation transponder detects a transmitted interrogation signal and responds by retransmitting the second harmonic of the signal. The 1st generation transponder performs this task while using no additional power besides that which accompanies the wireless signal. Demonstration of the first complete configuration provided proof of concept …
Resource Allocation Methodologies With Fractional Reuse Partitioning In Cellular Networks, 2011 University of South Florida
Resource Allocation Methodologies With Fractional Reuse Partitioning In Cellular Networks, Hazar Aki
USF Tampa Graduate Theses and Dissertations
Conventional cellular systems have not taken full advantage of fractional frequency reuse and adaptive allocation due to the fixed cluster size and uniformed channel assignment procedures. This problem may cause more fatal consequences considering the cutting-edge 4G standards which have higher data rate requirements such as 3GPP-LTE and IEEE 802.16m (WiMAX). In this thesis, three different partitioning schemes for adaptive clustering with fractional frequency reuse were proposed and investigated. An overlaid cellular clustering scheme which uses adaptive fractional frequency reuse factors would provide a better end-user experience by exploiting the high level of signal to interference ratio (SIR). The proposed …
Log-Periodic Microstrip Patch Antenna Miniaturization Using Artificial Magnetic Conductor Surfaces, 2011 University of South Florida
Log-Periodic Microstrip Patch Antenna Miniaturization Using Artificial Magnetic Conductor Surfaces, Ahmad Tariq Almutawa
USF Tampa Graduate Theses and Dissertations
Microstrip patch antennas are attractive for numerous military and commercial applications due to their advantages in terms of low-profile, broadside radiation, lowcost, low-weight and conformability. However, the inherent narrowband performance of patch antennas prohibits their use in systems that demand wideband radiation. To alleviate the issue, an existing approach is to combine multiple patch antennas within a log-periodic array configuration [1]. These log-periodic patch antennas (LPMAs) are capable of providing large bandwidths (>50%) with stable broadside radiation patterns. However, they suffer from electrically large sizes. Therefore, their miniaturization without degrading the bandwidth performance holds promise for extending their use …
Reducing Dimensionality Of Hyperspectral Data With Diffusion Maps And Clustering With K-Means And Fuzzy Art, 2011 Missouri University of Science and Technology
Reducing Dimensionality Of Hyperspectral Data With Diffusion Maps And Clustering With K-Means And Fuzzy Art, Louis Du Plessis, Rui Xu, Steven Damelin, Michael Sears, Donald C. Wunsch
Electrical and Computer Engineering Faculty Research & Creative Works
It is very difficult to analyse large amounts of hyperspectral data. Here we present a method based on reducing the dimensionality of the data and clustering the result in moving toward classification of the data. Dimensionality reduction is done with diffusion maps, which interpret the eigenfunctions of Markov matrices as a system of coordinates on the original dataset in order to obtain an efficient representation of data geometric descriptions. Clustering is done using k-means and a neural network clustering theory, Fuzzy ART (FA). The process is done on a subset of core data from AngloGold Ashanti, and compared to results …