Digital Commons Network^™

Acs Accreditation: What‟S In The Name?, Grace Tan

EDU-COM International Conference

In Australia, all higher education Information and Communications Technology (ICT) programs seek accreditation at the professional level with the Australian Computer Society (ACS). It acts as the basis for national and international benchmarking of ICT professional education. Additionally, meeting the requirements of an independent professional body is vital for onshore and offshore course marketing purposes, hence contributing towards the University‘s performance portfolio. The overriding task of the ACS accreditation is to examine all aspects in the provision of a quality ICT education program designed to produce competent graduates. To this end, the ACS seeks evidence that comprehensively covers the three …

Fpga Implementation Of A Telecommunications Trainer System, Carlos Oppus, Jose Claro N. Monje, Rosula Sj Reyes, Noel S. Patron, Reynaldo C. Guerrero Jr, Jovilyn Therese B. Fajardo

Department of Information Systems & Computer Science Faculty Publications

Field programmable gate arrays (FPGAs) have been used in a wide range of applications including the field of telecommunications. This paper presents the use of FPGAs in the implementation of both analog and digital modulation that includes amplitude modulation, frequency modulation, phase modulation, pulse code modulation, pulse width modulation, pulse position modulation, pulse amplitude modulation, delta modulation, amplitude shift keying, frequency shift keying, phase shift keying, time division multiplexing and different encoding techniques like non-return-to-zero line code, non-return-to-zero mark line code, non-return to zero inversion line code, Unipolar return-to-zero line code, bipolar return-to-zero line code, alternate mark inversion line code, …

A Mathematical Approach For Technology Selection In The Presence Of Slightly Non-Homogeneous Technologies, Reza Farzipoor Saen

International Journal of Applied Management and Technology

The assumption of classical technology selection models is based on complete homogeneity of technologies. In spite of this assumption in many applications some technologies do not comprehensively consume common inputs to comprehensively supply common outputs. The objective of this paper is to propose a model for selecting slightly non-homogeneous technologies. A numerical example demonstrates the application of the proposed method.

Mixed Oxidizer Hybrid Propulsion System Optimization Under Uncertainty Using Applied Response Surface Methodology And Monte Carlo Simulation, James Joshua Whitehead

Dissertations

No abstract provided.

National Cave And Karst Research Institute 2008-2009 Annual Report, National Cave And Karst Research Institute

KIP Articles

No abstract provided.

Fine-Grained Reputation-Based Routing In Wireless Ad Hoc Networks, Alma Cemerlic

Masters Theses and Doctoral Dissertations

Ad hoc networks are very helpful in situations when no fixed network infrastructure is available. They are especially important in emergency situations such as natural disasters and military conflicts. Most developed wireless ad hoc routing protocols are designed to discover and maintain an active path from source to destination with an assumption that every node is friendly and cooperative. However, it is possible that the participating nodes are selfish or malicious. A mechanism to evaluate reputation for each node is essential for the reliability and security of routing protocol in ad hoc networks. We propose a fine-grained reputation system for …

Northeastern Illinois University, 2008-2009 Academic Catalog, Northeastern Illinois University

Course Catalogs

No abstract provided.

Optimal Packings Of Up To 6 Equal Circles On A Triangular Flat Torus, Anna Castelaz, William Dickinson, Daniel Guillot, Sandi Xhumari

Student Summer Scholars Manuscripts

How do you optimally pack equal circles into the standard triangular torus? In this paper, we proved the optimal packings of 1 through 6 equal circles. In order to do this we used techniques from graph theory and also mathematical softwares like Maple and LaTeX. I only worked on proving the optimal packing of 6 equal circles on this special container called the standard triangular torus. In addition, I also contributed in improving the previous proofs for 5 or less equal circles. The purpose of my research was to prove the best packing of 6 equal circles into this at …

Can Silicon Carbide Nanotubes Be Effective Storage Medium For Hydrogen Storage?, Souptik Mukherjee

Physics Theses - Archive

A systematic study of molecular hydrogen adsorption on three different atomic configurations of armchair SICNTs has been performed. In the first stage of our study, first principles calculations using both density functional theory (DFT) and hybrid density functional theory (HDFT) as well as the finite cluster approximation have been performed to study the adsorption of molecular hydrogen on three types of armchair (9, 9) silicon carbide nanotubes. The distances of molecular hydrogen from the outer wall of the nanotubes have been optimized manually using the B3LYP and PW91 functionals and results have been compared in detail with published literature results. …

High Thermal Stability Of Carbon-Coated L10-Fept Nanoparticles Prepared By Salt-Matrix Annealing, Vikas Nandwana, Chuan-Bing Rong, Narayan Poudyal, Girija S. Chaubey, Yuzi Liu, Y.Q. Wu, M.J. Kramer, M.E. Kozlov, Ray H. Baughman, J. Ping Liu

Physics Faculty Publications - Archive

Monodisperse L10-FePt nanoparticles with size ranging from 3 to 8 nm were prepared by the salt-matrix annealing method. It was observed that the annealed particles have high thermal stability—no sintering occurred even when the particles were heated at 1100 °C for an hour. This high thermal stability resulted from carbon coating of the particles during salt-matrix annealing as consequence of decomposition of surfactants.

Ferrimagnetism And Magnetic Entropy Change For Tm/Re Multilayers, Maria Rodica Hossu

Physics Dissertations - Archive

Multilayers of Co/Tb, Ni/Gd, NiFe/Gd, CoFe/Gd and CoNi/Gd multilayers have been synthesized using dc magnetron sputtering and have been investigated experimentally by SQUID magnetometry. Due to the antiferromagnetic coupling between the transition metal and rare earth layers these systems behave like artificial ferrimagnets, with a minimum in total magnetic moment at compensation temperature. The measurement of magnetic moment (M) as a function of temperature (T) shows that magnetic phase transition occurs at different temperatures during the heating (superheating) and cooling (supercooling) cycles resulting in thermal hysteresis curve for M (T). Magnetic entropy change has been measured for CoFe/Gd and CoNi/Gd …

Electron Emission From Surfaces Resulting From Low Energy Positron Bombardment, Saurabh Mukherjee

Physics Dissertations - Archive

Measurements of the secondary electron energy spectra resulting from very low energy positron bombardment of a polycrystalline Au and Cu (100) surfaces are presented that provide evidence for a single step transition from an unbound scattering state to an image potential bound state. The primary positron energy threshold for secondary electron emission and energy cutoff of the positron induced secondary electron energy peak are consistent with an Auger like process in which an incident positron make a transition from a scattering state to a surface-image potential bound while transferring all of the energy difference to an outgoing secondary electron. We …

The Magnetic Susceptibility Record Of The Chinese Red-Clay Sequence: Enhancement Mechanisms, Temporal Variation, And Its Relationship To Orbital And Tectonic Forcing, Junsheng Nie

Open Access Dissertations

A more complete understanding of the forcing mechanisms of global climate change requires us to compare/contrast and synthesize paleoclimate information recorded in both kinds of archives. This "synthetic" approach demands a large amount of work, but the results tend to result in major advances in the field. To date this "synthetic" approach is largely limited to the last 2.7 million years (Myr) because very few continuous continental sedimentary records older than 2.7 Myr are available for comparison with the available marine records. This paucity of continental data is unfortunate because the time interval 5-3 million years ago (Ma) has been …

Numerical Analysis Of Respiratory Aerosol Deposition: Effects Of Exhalation, Airway Constriction And Electrostatic Charge, Samir C. Vinchurkar

Theses and Dissertations

The dynamics of particle laden flows are integral to the analysis of toxic particle deposition and medical respiratory aerosol delivery. Computational fluid-particle dynamics (CFPD) can play a critical role in developing a better understanding of particle laden flows, especially in a number of under-explored areas. The applications considered in this study include both the numerical aspects and the physical phenomena of respiratory aerosol transport. Objective I: Considering the effects of mesh type and grid convergence, four commonly implemented mesh styles were applied to a double bifurcation respiratory geometry and tested for flow patterns and aerosol deposition. Results indicated that the …

Finding And Using Readily Available Sources Of Assessment Data, Eric G. Boyce

School of Pharmacy Faculty Articles

This paper provides the rationale for, examples of, and the collection and general uses of currently available, potentially underutilized academic program assessment data. Academic program assessment is essential for program improvement and accreditation, but commonly used assessment methods may not fully meet these needs. General assessment references, pharmacy education literature, and prior experiences were used to identify and discuss sources of potentially underutilized assessment data. Pre-course assessments, graded assignments, examinations, pharmacy experience evaluations, scoring rubrics, portfolios, progress testing, self-assessments, and classroom assessment techniques are potential sources of assessment data. Course evaluations and grades may also be useful. Selection should be …

Legal Consciousness And Contractual Obligations, Kojo Yelpaala

McGeorge School of Law Scholarly Articles

No abstract provided.

After Natural Law: A Hermeneutic Response To Law’S Quandary, Francis J. Mootz Iii

McGeorge School of Law Scholarly Articles

No abstract provided.

Remote Forensics May Bring The Next Sea Change In E-Discovery: Are All Networked Computers Now Readily Accessible Under The Revised Federal Rules Of Civil Procedure?, Joseph J. Schwerha, Scott Inch

Journal of Digital Forensics, Security and Law

The recent amendments to Rule 26 of the Federal Rules of Civil Procedure created a two-tiered approach to discovery of electronically stored information (“ESI”). Responding parties must produce ESI that is relevant, not subject to privilege, and reasonably accessible. However, because some methods of storing ESI, such as on magnetic backup tapes and within enormous databases, require substantial cost to access and search their contents, the rules permit parties to designate those repositories as “not reasonably accessible” because of undue burden or cost. But even despite the difficulty in searching for ESI, the party’s duty to preserve potentially responsive evidence …

Medusan Morphospace: Phylogenetic Constraints, Biomechanical Solutions, And Ecological Consequences, John H. Costello, Sean Colin, John O. Dabiri

Arts & Sciences Faculty Publications

Medusae were the earliest animals to evolve muscle-powered swimming in the seas. Although medusae have achieved diverse and prominent ecological roles throughout the world's oceans, we argue that the primitive organization of cnidarian muscle tissue limits force production and, hence, the mechanical alternatives for swimming bell function. We use a recently developed model comparing the potential force production with the hydrodynamic requirements of jet propulsion, and conclude that jet production is possible only at relatively small bell diameters. In contrast, production of a more complex wake via what we term rowing propulsion permits much larger sizes but requires a different …

Magnetic Nanoparticles Based On Iron: Synthesis, Characterization, Design, And Application, Michael David Shultz

Theses and Dissertations

Magnetic nanoparticles are of great interest for a wide range of applications. This work has focused on three primary forms of iron based nanoparticles and combinations thereof: α-iron, iron oxide, and iron carbide or cementite. The synthesis of several core-shell particles including cementite-iron oxide, α-iron-cementite, and α-iron-iron oxide was accomplished through reverse micelle routes and high temperature decomposition of iron pentacarbonyl in various media. Structural analysis to confirm the structures was performed using extended x-ray absorption fine structure (EXAFS) techniques. A rapid characterization technique was developed utilizing a correlation between Fourier transform infrared spectroscopy and EXAFS to determine the full …

Measuring Configural Spatial Knowledge With Alternative Pointing Judgments, Lisa J. Douglas

Browse all Theses and Dissertations

Configural spatial knowledge has been tested by having people point from one object to another or by having them sketch maps from memory. Several different pointing judgments have been used, but these judgments appear to differ both in superficial characteristics and in their implied theoretical mental model of spatial representation. This experiment compares two different pointing judgments: judgments of relative direction, based on a quasi-Euclidean model of spatial representation; and object-based judgments, based on an object reference model of spatial representation. Results supported the object reference model. Object-based judgments were more accurate, were made with more confidence and had shorter …

The Development Of A Nonlinear Phase-Lock Loop With Adaptive Gain Control Based On Modern Control Theory, Michael D. Myers

Browse all Theses and Dissertations

As the performance of integrated circuits (IC) improve, a more precise clock-signal is needed to regulate their actions. The primary objective of this dissertation is to improve the phase-lock loop (PLL), which is the most common type of clock-generator. A nonlinear phase-lock loop (NPLL) was developed by adding a nonlinear-gain unit to a standard PLL. The NPLL implementation improves performance compared to existing PLLs by demonstrating faster acquisition times and superior jitter performance. The nonlinear-gain is achieved by the use of a fuzzy controller. The fuzzy controller takes in a value and generates outputs based upon the rules that are …

Broad Bandwidth High Resolution Analog To Digital Converters: Theory, Architecture And Implementation, Saiyu Ren

Browse all Theses and Dissertations

Analog to digital converters (ADCs) translate analog quantities, which are characteristic of most phenomena in the "real world" to digital language for a variety of applications including information processing, computing, communication and control systems. The performance of the digital signal processing and communication systems is generally limited by the speed and precision of the digital input signal which is achieved at the interface between analog and digital information. The analog to digital converter (ADC) has become a critical component for advanced telecommunication systems. The desire to move the analog to digital interface closer to the sensor has resulted in more …

Dissolution Kinetics Of Sulfate Minerals: Linking Environmental Significance Of Mineral-Water Interface Reactions To The Retention Of Aqueous Cro42- In Natural Waters, Sweta Bose

Browse all Theses and Dissertations

Dissolution as a function of solution undersaturation (Ω) was studied on both celestite and barite (001) by the aid of atomic force microscopy (AFM). Both the sulfates exhibited non-linear reactivity trends showing increasing dissolution rates with decreasing Ω. In the case of celestite, the dissolution rate non linearity was attributed to a changeover in reaction mechanism. At higher undersaturations below a critical saturation state of Ω_crit ~ 0.1, dissolution occurred both along the existing step edges and also via the creation of new steps. At conditions near saturation states dissolution took place exclusively by removal of ions from existing …

Improved Structural Health Monitoring Using Random Decrement Signatures, Oleg V. Shiryayev

Browse all Theses and Dissertations

Detection of structural damage phenomena such as cracks, delaminations, or loose fasteners is important because it increases safety and may allow significant reduction in operational costs. Many structural health monitoring techniques are based on detecting changes in vibration features obtained from the measured response. The technique presented in this work is based on the random decrement signatures calculated from the random response. No knowledge of input signal is required. Random decrement signatures have been used for damage detection purposes in the past. The significance of this work is that it explores the possibility of identifying the type of damage and …

Comparison Of Two Methods Of External Scatter Dose Contributions To The Contralateral Breast, James Cutlip

Browse all Theses and Dissertations

The treatment outcomes of many forms of breast cancer have become very favorable. The usual standard of successful treatment of five years without a recurrence is not adequate any longer for breast cancer. Many patients live well beyond this time interval only to have a second malignancy develop in the contralateral breast ten or twenty years later. Boice et al (1992) found that there was a correlation between the amount of dose to the contralateral breast and the likelihood of a secondary malignancy forming.

The normal practice today is to use multi-leaf collimators (MLC) to modulate the photon beam in …

An Assessment Of The Allelopathic Potential Of Alliaria Petiolata, Eulondia Kathryn Barto

Browse all Theses and Dissertations

Garlic mustard (GM), Alliaria petiolata, a European biennial herb invasive in North America, produces secondary metabolites that may contribute to its invasive success by allelopathically inhibiting growth of native plants. I tested this hypothesis by determining the levels, and stability, of these compounds in field soils. I also explored differences in the phytochemical profiles of GM and closely related North American species, and biogeographic differences in allelopathic effects on North American and European arbuscular mycorrhizal fungi (AMF). Furthermore, I exposed a North American annual herb, pale jewelweed (Impatiens pallida), and its AMF, to GM extracts in order …

A Framework To Support Spatial, Temporal And Thematic Analytics Over Semantic Web Data, Matthew Steven Perry

Browse all Theses and Dissertations

Spatial and temporal data are critical components in many applications. This is especially true in analytical applications ranging from scientific discovery to national security and criminal investigation. The analytical process often requires uncovering and analyzing complex thematic relationships between disparate people, places and events. Fundamentally new query operators based on the graph structure of Semantic Web data models, such as semantic associations, are proving useful for this purpose. However, these analysis mechanisms are primarily intended for thematic relationships. This dissertation proposes a framework built around the RDF data model for analysis of thematic, spatial and temporal relationships between named entities. …

Global Optimization Of An Aircraft Thermal Management System Through Use Of A Genetic Algorithm, Christopher T. Allen

Browse all Theses and Dissertations

Optimization algorithms utilize known information about the system to identify solutions that are more efficient and meet the requirements of the user. The algorithms require an objective function, or formula (linear or nonlinear) that models what the user is looking to optimize, in order to begin the search for a more feasible solution. Because optimization problems can involve either linearor non-linear functions, various algorithms have been created that can locate optimum solutions faster depending on the type of objective function being optimized.

This research focuses on optimizing an aircrafts thermal management system by using one such algorithm. This was performed …

The Synthesis And Characterization Of Imidazolium Lithium Phthalocyanines, John J. Kelley

Browse all Theses and Dissertations

A series of 1,3-di-substituted-imidazolium lithium phthalocyanines, in which the substituents on the imidazolium nitrogens were combinations of methyl, ethyl, pentyl, hexyl, isopropyl, adamantyl or 2,4,6-trimethylphenyl groups, was synthesized. The cation exchange of a single lithium ion of dilithium phthalocyanine for a 1,3-disubstituted-imidazolium ion was performed by mixing their salts in common organic solvents under ambient conditions. This afforded a number of imidazolium lithium phthalocyanines in moderate yields. They exhibited poor solubility in most solvents. Their composition and purity were initially verified by 1H and 13C-NMR and elemental analysis. The 1H-NMR spectra also indicated that the imidazolium and lithium phthalocyanine ions …