Digital Commons Network^™

Reactive Power And Voltage Control Of The Nigerian Grid System Using Micro-Genetic Algorithm, Ganesh K. Venayagamoorthy, G. A. Bakare, U. O. Aliyu

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, a micro-genetic based approach to the optimization of reactive power and voltage profiles improvement and real power loss minimization is presented. The reactive power control devices such as generators, tap positions of on-load tap changer of transformers, shunt reactors are used to correct voltage limits violations while simultaneously reducing the system real power losses. Genetic algorithms (GAs) are well-known global search techniques anchored on the mechanisms of natural selection and genetics. Because of the time intensive nature of the conventional GA, the micro-GA is proposed as a more time efficient alternative. The feasibility and effectiveness of the …

Spin-System Radio-Frequency Superradiation: A Phenomenological Study And Comparison With Numeric Simulations, Carrie L. Davis, Victor K. Henner, Aleksandr V. Chernatynskiy, Ilia V. Kaganov

Physics Faculty Research & Creative Works

We discuss the coherent behavior of a polarized, nuclear or electron, spin system for which the magnetic dipole radiation emitted in the radio-frequency region, has approximately quadratic dependence on the number of spins. An effective method of describing these phenomena is provided by computer simulation of a microscopic model of the spin system. Important aspects of this numeric simulation are described, together with a comparison with the theoretical predictions. The behavior of the transverse component of the magnetic moment, M⁺ (t), in super-radiant conditions is studied. In addition, the role of dipole-dipole interactions in super-radiation phenomena is investigated in …

Photocontrol Of Upper And Lower Rim Complexation Of Neutral And Cationic Species By P-Tert-Butylcalix[4]Arene Tetraethyl Ester, Mary Deasy, Bernadette Creaven, Brian A. Murray, Catherine Mckenna, Darren Tobin

Articles

A number of sodium salt complexes of p-tert-butylcalix[4]arene tetraethyl ester, 1, were isolated both with and without upper-rim encapsulated solvent. Selective decomplexation of lower rim bound sodium cations and upper rim encapsulated solvent molecules could be successfully achieved using low pressure light sources. Oxidation of the counter anion at the lower rim of p-tert-butylcalix[4]arene tetraethyl ester triggered both the upper and lower rim decomplexation process. The extent of decomplexation at both rims is controlled both by the nature of the counter-anionic species at the lower rim and by the fate of the photoproducts generated. The calixarene host …

2005-00-00 Faculty Handbook, Morehead State University. Faculty Senate.

Faculty Senate Records

Faculty Handbook believed to have been revised between 2002 and 2005.

Measurement Of Charm Fragmentation Ratios And Fractions In Photoproduction At Hera, S. Chekanov, M. Derrick, S. Magill, S. Miglioranzi, B. Musgrave, J. Repond, R. Yoshida, Margarita C. K. Mattingly, N. Pavel, A. G. Yagües Molina, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, G. Cara Romeo, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, S. De Pasquale, P. Giusti, G. Iacobucci, A. Margotti, A. Montanari, R. Nania, F. Palmonari, A. Pesci, A. Polini

Faculty Publications

© 2005, Springer New York LLC. All rights reserved. The production of D∗+, D0, D+, D+s and Λ+c charm hadrons and their antiparticles in ep scattering at HERA was measured with the ZEUS detector using an integrated luminosity of 79 pb−1. The measurement has been performed in the photoproduction regime with the exchanged-photon virtuality Q2 < 1GeV2 and for photon-proton centre-of-mass energies in the range 130 3.8GeV and pseudorapidity |η(D,Λc)| < 1.6. The production cross sections were used to determine the ratio of neutral and charged D-meson production rates, Ru/d, the strangeness-suppression factor, γs, and the fraction of charged D mesons produced in a vector state, Pdv. The measured Ru/d and γs values agree with those obtained in deep inelastic scattering and in e+e- annihilations. The measured Pdv value is smaller than, but consistent with, the previous measurements. The fractions of c quarks hadronising as a particular charm hadron, f(c → D, Λc), were derived in the given kinematic range. The measured open-charm fragmentation fractions are consistent with previous results, although the measured f(c → D*+) is smaller and f(c → Λ+c) is larger than those obtained in e+e- annihilations. These results generally support the hypothesis that fragmentation proceeds independently of the hard sub-process.

Habitat Patch Occupancy Dynamics Of Glaucous-Winged Gulls (Larus Glaucescens) Ii: A Continuous-Time Model, Smruti P. Damania, Karl W. Phillips, Shandelle M. Henson, James L. Hayward

Faculty Publications

The diurnal distribution and abundance dynamics of loafing Glaucous-winged Gulls (Larus glaucescens) were examined at Protection Island National Wildlife Refuge, Strait of Juan de Fuca, Washington. Asynchronous movement of gulls among three habitat patches dedicated to loafing was modeled as a function of environmental variables using differential equations. Multiple time scale analysis led to the derivation of algebraic models for habitat patch occupancy dynamics. The models were parameterized with hourly census data collected from each habitat patch, and the resulting model predictions were compared with observed census data. A four-compartment model explained 41% of the variability in the data. Models …

Habitat Patch Occupancy Dynamics Of Glaucous-Winged Gulls (Larus Glaucescens) I: A Discrete-Time Model, Karl W. Phillips, Smruti P. Damania, James L. Hayward, Shandelle M. Henson, Clara J. Logan

Faculty Publications

Diurnal habitat occupancy dynamics of Glaucous-winged Gulls were evaluated in a system of six habitats on and around Protection Island, Washington. Data were collected on the rates of gull movement between habitat patches, and from these data the probabilities of transitions between habitats were estimated as functions of tide height and time of day. A discrete-time matrix model based on the transition probabilities was used to generate habitat occupancy predictions, which were then compared to hourly census data. All model parameters were estimated directly from data rather than through model fitting. The model made reasonable predictions for two of the …

Evaluation Of Errors In National Energy Forecasts, Denys Sakva

Theses

Energy forecasts are widely used by the U.S. government, politicians, think tanks, and utility companies. While short-term forecasts were reasonably accurate, medium and long-range forecasts have almost always been highly erroneous. In the U.S. many energy policy decisions are driven by Annual Energy Outlook (AEO) forecasts prepared by Energy Information Association (EIA). This thesis evaluates accuracy of AEO reports from 1982 to 2003. Parameters evaluated are: total energy consumption, energy consumption by sector, sector specific parameters, and major model assumptions. Error decomposition and regression analysis are used to appraise accuracy of forecasts. I found that often underlying parameters used to …

An Analysis Of The Social Support Network Of Gay Men Living With Hiv, Bridget Roberts-Pittman

All-Inclusive List of Electronic Theses and Dissertations

This study examined the social support networks of gay men living with HIV. This study represents a unique detailing of the specific members of their social support networks. Eighty-five participants completed the Social Support Questionnaire (Wright, 1995) initially and at 6-month intervals for a 2-year period. The participants were divided into 3 groups defined by HIV status: (a) asymptomatic; (b) symptomatic; and (c) AIDS. Seven participants were randomly selected from each group, resulting in the sample of 21 participants with 238 different individuals within the networks. Networks were examined in terms of stability of the members within the specific networks. …

Variables That Predict Success In Mathematics For Females In Highereducation: An Analysis Of Quantitative And Qualitative Predictors, Dottie L. King

All-Inclusive List of Electronic Theses and Dissertations

Female students in higherEducation do not pursue high-level mathematics courses in the same proportion as males and this creates lessened opportunities for them. This mixed-methods study investigated attitudes as well as achievement factors that encourage or inhibit success for female students in mathematics. Mathematics SAT/ACT scores and high school courses of first-year students at a private women's college in the Midwest were used as achievement data; seven of the Fennema-Sherman scales provided attitudinal data. Multiple regression techniques were used to determine whether attitudinal or achievement variables best predict success and to create a model with the first college-level mathematics grade …

Elgamal-Type Signature Schemes In Modular Arithmetic And Galois Fields, Gerard Nealon

Theses

A digital signature is like a handwritten signature for a file, such that it ensures the identity of the person responsible for the file and prevents any unauthorized changes to the original file. Digital signatures use the same technology as most public key cryptosystems in which there is a public and private key. Most mathematical operations are done over a field Zp where p is some large prime. It is possible to do the same operations over other finite fields. My project explains and studies the different finite fields that can be used as well as ways to implement and …

Gross Margins Guide 2005 Western Australia, Allan Herbert

Farm Systems and Economics published reports

The Western Australian Department of Agriculture has prepared this 2005 booklet with the following aim:

To provide budgeting information for farmers, agribusiness, and other students of agriculture to enhance understanding and more informed decision making.

It builds on a previous similar booklet - "Gross Margins Guide 2003" - which was produced in 2002 with Commonwealth Bank sponsorship. 2,500 copies of that booklet were produced and gained wide readership. Gross margins for broad area agriculture had not been published by the Department for the previous 1 O years. Feedback and further requests suggested that an update was necessary - hence this …

Opto-Vlsi Processing For Reconfigurable Optical Devices, Chung-Kiak Poh

Theses: Doctorates and Masters

The implementation of Wavelength Division Multiplexing system (WDM) optical fibre transmission systems has the potential to realise this high capacity data rate exceeding 10 Tb/s. The ability to reconfigure optical networks is a desirable attribute for future metro applications where light paths can be set up or taken down dynamically as required in the network. The use of microelectronics in conjunction with photonics enables intelligence to be added to the high-speed capability of photonics, thus realising reconfigurable optical devices which can revolutionise optical telecommunications and many more application areas. In this thesis, we investigate and demonstrate the capability of Opto-VLSI …

Promoting Metacognitive Regulation Through An On-Line Environment, Mark Mcmahon

Theses: Doctorates and Masters

The constantly evolving world of work is causing a great deal of emphasis on the need for graduating students to demonstrate a range of generic skills to enable them to be both employable and able to adapt easily to new requirements. However, research indicates that secondary schooling is not preparing students adequately for learning independently.

This study sought to explore strategies for developing and supporting the metacognitive skills of higher education students. In particular, it sought to explore how university students' cognitive self-regulation could be supported in an on-line environment designed to engage them in the self-monitoring integral to metacognitive …

Exploring A Technology-Facilitated Part-Complete Solution Method For Learning Computer Programming, Stuart K. Garner

Theses: Doctorates and Masters

Learning to program is now a requirement in many courses of study in such areas as computer science, information technology, information systems, multimedia. engineering, and science. However, research indicates that many students have great difficulties in learning to program and this results in high failure rates and high levels of withdrawal from academic courses. It is accepted that programming is an intrinsically difficult subject however the teaching and learning methods used in many programming courses have changed little over the years. The literature indicates the importance of reducing the cognitive load that students experience when learning programming and that one …

Gas Plume Species Identification In Lwir Hyperspectral Imagery By Regression Analyses, David Pogorzala

Theses

The goal of this research was to develop an algorithm for identifying the constituent gases in stack releases. At the heart of the algorithm is a stepwise linear regression technique that only includes a basis vector in the model if it contributes significantly to the fit. This significance is calculated by an F-statistic. Issues such as atmospheric compensation, gas absorption and emission, background modeling, and fitting a linear regression to a non-linear radiance model were addressed in order to generate the matrix of basis vectors. Synthetic imagery generated by the DIRISG model were used as test cases. Results show that …

Analytical Investigations Of Modified Active Remote Dynamic Vibration Absorbers, Piyes Srungboonmee

Theses

This thesis investigates the performance of proposed modified Active Remote Dynamic Absorber (ARDA) systems. The modification is intended to improve the practicability of the previously proposed ARDA technique. The current ARDA concept utilizes an absorber system identical to the primary system (the system whose vibration is to be controlled) and two voltage amplifiers. The modification to the current ARDA system employs one amplifier only and a smaller absorber system. The mathematical model of the modified ARDA systems is developed based on a finite element approach. The developed mathematical model is programmed and solved using Maple. The program is validated by …

Novel Polyimides Based On 2,2-Bis(3-Amino-4-Hydroxyphenyl)Hexafluoropropane, 4,4'- (Hexafluoroisopropylidene)Diphthalic Anhydride, And Mellitic Acid Dianhydride, And Their Nlo Pendent Polymers, Eugene Galperin

Theses

Not included.

Generation Of A Combined Dataset Of Simulated Radar And Electro-Optical Imagery, Nancy L. Baccheschi

Theses

In the world of remote sensing there exist radar sensors and EO/IR sensors, both of which carry with them unique information useful to the imaging community. Radar has the capability of imaging through all types of weather, day or night. EO/IR produces radiance maps and frequently images at much finer resolution than radar. While each of these systems is valuable to imaging, there exists unknown territory in the imaging community as to the value added in combining the best of both these worlds. This work will begin to explore the challenges in simulating a scene in both a radar tool …

A Process Capability Index For Three-Dimensional Data With Circular Or Ellipsoidal Tolerances., Veljko Fotak

Theses

We discuss the estimation of a process capability index for three-dimensional data. Initially, we focus on the case in which the engineering tolerance associated with the measurements is a sphere. Then, we extend the discussion to the more general case in which the engineering tolerance is ellipsoidal. In both cases, we develop summary measures for repeatability and reproducibility, to be used in the context of a process capability index.

In the spherical tolerance case we define summary measures, where each measure is based on the diameter of a sphere that leads to a pre-specified capture rate (we will use here …

Low Frequency Noise Modeling In Single- And Double-Gate Mosfets, Shailesh S. Rai

Theses

The Flicker or 1// noise dominates the noise spectrum at low frequency. A serious concern for MOSFETs for circuit application is much higher flicker (1//) noise because of the heterogeneous interface between silicon (Si) and silicon dioxide (Si02). Very high intrinsic flicker noise of CMOS transistors becomes a drawback for low-Intermediate Frequency (IF) or direct-conversion architectures. In spite of extensive research and efforts to understand the low-frequency noise origin in semiconductor devices, there exists no unique theory to explain the low-frequency noise generation mechanism. Flicker noise in MOSFETs is usually perceived to be caused by carrier density fluctuations, which is …

Modeling Multiple Scattering And Absorption For A Differential Absorption Lidar System, Daniel D. Blevins

Theses

The Digital Image and Remote Sensing Image Generation (DIRSIG) model has been developed and utilized to support research at the Rochester Institute of Technology (RIT) for over a decade. The model is an established, first-principles-based scene simulation tool that has been focused on passive multi- and hyper-spectral sensing from the visible to long wave infrared (0.4 to 14 pm). Leveraging photon mapping techniques utilized by the computer graphics community, a first-principles-based elastic Light Detection and Ranging (LIDAR) model was incorporated into the passive radiometry framework so that the model calculates arbitrary, time-gated photon counts at the sensor for atmospheric, topographic, …

Evaluation Of Numerical, Analytical, And Experimental Particle Deposition In Simple And Lung Geometries, Pamela M. Snyder

Theses

Particle deposition is utilized to determine exposure limits, design inhaled medications, and study pulmonary disorders that are a result of airborne pathogens. This information can be obtained from analytical equations, experimental studies, empirical relationships, and numerical analysis.

This research utilizes analytical equations, empirical relationships, and experimental data to investigate the accuracy of three Computational Fluid Dynamics (CFD) software packages; Fluent Discrete Phase Model (DPM), Fluent Fine Particle Model (FPM) and CFX. The sedimentation, molecular diffusion and impaction deposition mechanisms are investigated in a straight tube, bifurcating tube, and three generation lung geometry.

Sedimentation is evaluated in the straight tube for …

Security In Serverless Network Environments, Carl Holtje

Theses

As portable computing devices grow in popularity, so does the need for secure communications. Lacking tethers, these devices are ideal for forming small proximal groups in an ad-hoc fashion in environments where no server or permanent services are available. Members of these groups communicate over a broadcast or multicast network interconnect, and rely upon each other to form a cohesive group. While generally small in size and short in lifetime, security is a critical aspect of these groups that has received much academic attention in recent years. Much of the research focuses upon generating a common, group-wide private key suitable …

A Comparison Of Reputation-Based Trust Systems, John Folkerts

Theses

Recent literature contains many examples of reputation systems which are constructed in an ad hoc way or rely upon some heuristic which has been found to be useful. However, comparisons between these reputation systems has been impossible because there are no established methods of comparing performance. This paper introduces a simulation framework which can be used to perform comparison analysis between reputation models. Two reputation models, one from Abdul-Rahman and Hailes (ARH) [1], and one from Mui, Mohtashemi, and Halberstadt (MMH) [17] are implemented and compared with regard to accuracy, performance and resistance to deception. In order to improve performance …

Compact Realizations Of Embedded Filters In Organic Substrates, William Lambert

Theses

Making communication devices smaller, lighter, and cheaper has been the driving force behind the development of new technologies which have made the cellular phones and wireless networks we now take for granted possible. The frequent emphasis on miniaturization particularly has required the development of a variety of new approaches to creating communications circuits. One such technology that has attracted a great deal of attention in recent years is passives that are embedded into the package of communications integrated circuits. Using these devices reduces the amount of surface area required to implement a communications device, in addition to potentially improving performance …

Data Aggregation And Cross-Layer Design In Wsns, Carter May

Theses

Over the past few years, advances in electrical engineering have allowed electronic devices to shrink in both size and cost. It has become possible to incorporate environmental sensors into a single device with a microprocessor and memory to interpret the data and wireless transceivers to communicate the data. These "sensor nodes" have become small and cheap enough that they can be distributed in very large numbers into the area to be monitored and can be considered disposable. Once deployed, these sensor nodes should be able to self-organize themselves into a usable network. These "wireless sensor networks," or WSNs, differ from …

An Experimental Investigation Into The Effect Of Surfactants On Air-Water Two-Phase Flow In Minichannels, Nathan J. English

Theses

The complex interfacial phenomena involved in two-phase gas-liquid flow have defied mathematical simplification and modeling. However, the systems are used in heat exchangers, condensers, chemical processing plants, and nuclear reactor systems. The present work considers a 1 mm square minichannel and adiabatic flows corresponding to practical PEM fuel cell conditions. Pressure drop data is collected in experimentation covering mass fluxes of 4.0-33.6 kg/m2s, which correspond to superficial gas and liquid velocities of 3.4-10 m/s and 0.001-0.02 m/s respectively. The experiments are repeated with water of reduced surface tension, caused by the addition of surfactant, in order to quantify the surface …

Hardware And Software Multi-Precision Implementations Of Cryptographic Algorithms, Muhammad A. Janjua

Theses

The software implementations of cryptographic algorithms are considered to be very slow, when there are requirements of multi-precision arithmetic operations on very long integers. These arithmetic operations may include addition, subtraction, multiplication, division and exponentiation. Several research papers have been published providing different solutions to make these operations faster. Digital Signature Algorithm (DSA) is a cryptographic application that requires multi-precision arithmetic operations. These arithmetic operations are mostly based upon modular multiplication and exponentiation on integers of the size of 1024 bits. The use of such numbers is an essential part of providing high security against the cryptanalytic attacks on the …

Real-Time Control System Framework, Nishant Thakkar

Theses

Computer based controllers are being used increasingly in every aspect of modern life and have been integrated into everything from simple thermostats to the most complicated fighter jets. Multiple methodologies can be used within these controllers including differential equations, discrete difference equations, and fuzzy logic. Also, they can run on platforms ranging from scaled down versions of consumer operating systems to directly on embedded processors. What's missing is a low cost framework that links the variety of methodologies used in controllers and the variety of platforms that controllers can run on. My thesis is that it is possible to create …