Physical Sciences and Mathematics Commons^™

Split-Step Approach To Electromagnetic Propagation Through Atmospheric Turbulence Using The Modified Von Karman Spectrum And Planar Apertures, Monish Ranjan Chatterjee, Fathi H.A. Mohamed

Electrical and Computer Engineering Faculty Publications

The impact of atmospheric phase turbulence on Gaussian beam propagation along propagation paths of varying lengths is examined using multiple random phase screens. The work is motivated by research involving generation and encryption of acousto-optic chaos, and the interest in examining propagation of such chaotic waves through atmospheric turbulence. A phase screen technique is used to simulate perturbations to the refractive index of the medium through the propagation path. A power spectral density based on the modified von Karman spectrum model for turbulence is used to describe the random phase behavior of the medium.

In recent work, results for the …

Review: The Wilderness Writings Of Howard Zahniser, Jillian M. Slater

Marian Library Faculty Publications

No abstract provided.

Improved Performance Of Analog And Digital Acousto-Optic Modulation With Feedback Under Profiled Beam Propagation For Secure Communication Using Chaos, Fares S. Almehmadi, Monish Ranjan Chatterjee

Electrical and Computer Engineering Faculty Publications

Using intensity feedback, the closed-loop behavior of an acousto-optic hybrid device under profiled beam propagation has been recently shown to exhibit wider chaotic bands potentially leading to an increase in both the dynamic range and sensitivity to key parameters that characterize the encryption. In this work, a detailed examination is carried out vis-à-vis the robustness of the encryption/decryption process relative to parameter mismatch for both analog and pulse code modulation signals, and bit error rate (BER) curves are used to examine the impact of additive white noise.

The simulations with profiled input beams are shown to produce a stronger encryption …

Discovery Of Thienoquinolone Derivatives As Selective And Atp Non-Competitive Cdk5/P25 Inhibitors By Structure-Based Virtual Screening, Arindam Chatterjee, Stephen J. Cutler, Robert J. Doerksen, Ikhlas A. Khan, John S. Williamson

Office for Research Publications and Presentations

Calpain mediated cleavage of CDK5 natural precursor p35 causes a stable complex formation of CDK5/p25, which leads to hyperphosphorylation of tau. Thus inhibition of this complex is a viable target for numerous acute and chronic neurodegenerative diseases involving tau protein, including Alzheimer’s disease. Since CDK5 has the highest sequence homology with its mitotic counterpart CDK2, our primary goal was to design selective CDK5/p25 inhibitors targeting neurodegeneration. A novel structure-based virtual screening protocol comprised of e-pharmacophore models and virtual screening workflow was used to identify nine compounds from a commercial database containing 2.84 million compounds. An ATP non-competitive and selective thieno[3,2- …

Sustainability Research Through The Lens Of Environmental Ethics, Daniel Clifford Fouke, Sukh Sidhu, Robert J. Brecha

Physics Faculty Publications

Two core courses in the curriculum of the University of Dayton’s Sustainability, Energy, and the Environment minor, Sustainability Research I and II, were developed out of the frustration one author, Daniel Fouke, experienced while teaching a traditional course on environmental ethics for the Department of Philosophy. The often-overwhelming nature of environmental problems tended to demoralize both the instructor and the students. Seeking a way to integrate ethical analysis of complex problems with the search for solutions, two courses were proposed that would be team-taught by a philosopher and a scientist or an engineer.

Development of the courses was initially funded …

2014 (Fall), University Of Dayton. Department Of Mathematics

Colloquia

Abstracts of the talks given at the 2014 Fall Colloquium.

Exhibition Handlist, Kathleen M. Webb

Supplemental Media: Catalogue, Handlist, Lectures, Events and More

In preparing for Imprints and Impressions, we ran across many interesting words that have fallen out of the general lexicon. With this booklet, we have brought one back: handlist. Dean Kathleen Webb ran across it in a 1944 booklet from the J. Pierpont Morgan Library in New York City. Though the word no longer appears in most new dictionaries, it’s still in the Oxford English Dictionary:

A list of a particular type or category of things, presented in a readily consultable form; esp. a list of the books or manuscripts in a particular place, on a particular subject, etc.; …

Capacity Planning With Financial And Operational Hedging In Low‐Cost Countries, Lijian Chen, Shanling Li, Letian Wang

MIS/OM/DS Faculty Publications

The authors of this paper outline a capacity planning problem in which a risk-averse firm reserves capacities with potential suppliers that are located in multiple low-cost countries. While demand is uncertain, the firm also faces multi-country foreign currency exposures. This study develops a mean-variance model that maximizes the firm’s optimal utility and derives optimal utility and optimal decisions in capacity and financial hedging size. The authors show that when demand and exchange rate risks are perfectly correlated, a risk- averse firm, by using financial hedging, will achieve the same optimal utility as a risk-neutral firm. In this paper as well, …

Seeing Human Weight From A Single Rgb-D Image, Tam Nguyen, Jiashi Feng, Shuicheng Yan

Computer Science Faculty Publications

Human weight estimation is useful in a variety of potential applications, e.g., targeted advertisement, entertainment scenarios and forensic science. However, estimating weight only from color cues is particularly challenging since these cues are quite sensitive to lighting and imaging conditions. In this article, we propose a novel weight estimator based on a single RGB-D image, which utilizes the visual color cues and depth information. Our main contributions are three-fold.

First, we construct the W8-RGBD dataset including RGB-D images of different people with ground truth weight.

Second, the novel sideview shape feature and the feature fusion model are proposed to facilitate …

Heat Release Of Polyurethanes Containing Potential Flame Retardants Based On Boron And Phosphorus Chemistries, Vladimir Benin, Bastien Gardelle, Alexander Morgan

Chemistry Faculty Publications

Using a polyurethane of methylene diphenyl isocyanate and 1,3-propane diol, several new non-halogenated aromatic boron and phosphorus flame retardants were evaluated for heat release reduction potential using the pyrolysis combustion flow calorimeter (PCFC). The polyurethanes were prepared in the presence of the potential flame retardants via solvent mixing and copolymerization methods, and were then analyzed via spectroscopic methods to determine if the flame retardant was still present in the final product. PCFC testing on the resulting products showed that the flame retardant molecule can have different effects on heat release depending upon how it is mixed into the polyurethane. Some …

Modeling Of Power Spectral Density Of Modified Von Karman Atmospheric Phase Turbulence And Acousto-Optic Chaos Using Scattered Intensity Profiles Over Discrete Time Intervals, Monish Ranjan Chatterjee, Fathi H.A. Mohamed

Electrical and Computer Engineering Faculty Publications

In recent research, propagation of plane electromagnetic (EM) waves through a turbulent medium with modified von Karman phase characteristics was modeled and numerically simulated using transverse planar apertures representing narrow phase turbulence along the propagation path.

The case for extended turbulence was also studied by repeating the planar phase screens multiple times over the propagation path and incorporating diffractive effects via a split-step algorithm. The goal of the research reported here is to examine two random phenomena: (a) atmospheric turbulence due to von Karman-type phase fluctuations, and (b) chaos generated in an acousto-optic (A-O) Bragg cell under hybrid feedback. The …

Realization Of Negative Index In Second-Order Dispersive Metamaterials Using Standard Dispersion Models For Electromagnetic Parameters, Tarig A. Algadey, Monish Ranjan Chatterjee

Electrical and Computer Engineering Faculty Publications

In recent work, electromagnetic propagation velocities for plane waves in dispersive metamaterials were calculated assuming frequency dispersion up to the second order. The three velocities were expressed in terms of dispersive coefficients under certain simplifying constraints. Frequency domains were found to exist around resonances where group and phase velocities are in opposition, implying possible negative index behavior.

In this paper, we incorporate in the derived equations physical models (including Debye, Lorentz and Condon) for material dispersion in permittivity, permeability and chirality in order to further examine the consequences of second-order dispersion leading to negative index for practical cases, and also …

Information Encryption, Transmission, And Retrieval Via Chaotic Modulation In A Hybrid Acousto-Optic Bragg Cell Under Profiled Beam Illumination, Monish Ranjan Chatterjee, Fares S. Almehmadi

Electrical and Computer Engineering Faculty Publications

In recent work, the propagation of a profiled optical beam through an open-loop acousto-optic Bragg cell was examined using a transfer function formalism. The device was also studied under closed-loop via intensity feedback, and shown to exhibit more extended chaotic band responses, thereby potentially increasing the dynamic range and parameter sensitivities of any applied signal and the device operation respectively.

In this paper, simple low- to mid-RF signals (periodic waveforms and low BW audio) are transmitted through the closed-loop system and the resulting encryption and recovery at the receiver are examined especially from the perspective of overall robustness of the …

Numerical Investigation Of The Nonlinear Dynamics Of A Hybrid Acousto-Optic Bragg Cell With A Variable Feedback Gain, Monish Ranjan Chatterjee, Hao Zhou

Electrical and Computer Engineering Faculty Publications

Since around 1979, the operation of an acousto-optic Bragg cell under positive first-order feedback via amplification and delay in the loop has been studied extensively by several groups [1-3]. In recent work, the analysis of the nonlinear dynamics (NLD) of the system was extended to include bistable maps and Lyapunov exponents, and application of the chaos for signal encryption and decryption for uniform plane waves. The present work originated with the problem of a variable photodetector aperture opening relative to the first-order light. This potentially complex problem is simplified by assuming instead a variable feedback gain ( β ~ (t)), …

Determination Of Corrosion Inhibitor Lubricity Improver In Jet Fuel By Liquid Chromatography-Electrospray Ionization Mass Spectrometry, David W. Johnson, Milissa Flake, Ryan Adams

Chemistry Faculty Publications

Military jet fuel (JP-8) is very similar to commercial jet fuel (Jet A) except for the presence of three additives, fuel system icing inhibitor, corrosion inhibitor–lubricity improver (CI-LI), and antistatic additive, which are added to improve characteristics of JP-8. Of particular interest is the CI-LI additive; the most common active ingredient is a dimer of linoleic acid. This article focuses on quantification of the active ingredient in the CI-LI additive by liquid chromatography–mass spectrometry (LC–MS). This method will allow the determination of CI-LI content in military jet fuel samples.

Nonlocal And Quantum-Tunneling Contributions To Harmonic Generation In Nanostructures: Electron-Cloud-Screening Effects, Michael Scalora, Maria Antonietta Vincenti, Domenico De Ceglia, Joseph W. Haus

Electrical and Computer Engineering Faculty Publications

Our theoretical examination of second- and third-harmonic generation from metal-based nanostructures predicts that nonlocal and quantum-tunneling phenomena can significantly exceed expectations based solely on local, classical electromagnetism. Mindful that the diameter of typical transition-metal atoms is approximately 3 Å, we adopt a theoretical model that treats nanometer-size features and/or subnanometer-size gaps or spacers by taking into account (i) the limits imposed by atomic size to fulfill the requirements of continuum electrodynamics, (ii) spillage of the nearly free electron cloud into the surrounding vacuum, and (iii) the increased probability of quantum tunneling as objects are placed in close proximity.

Our approach …

2014 (Summer), University Of Dayton. Department Of Mathematics

Colloquia

Abstracts of the talks given at the 2014 Colloquium.

Structure Preserving Large Imagery Reconstruction, Ju Shen, Jianjun Yang, Sami Taha Abu Sneineh, Bryson Payne, Markus Hitz

Computer Science Faculty Publications

With the explosive growth of web-based cameras and mobile devices, billions of photographs are uploaded to the internet. We can trivially collect a huge number of photo streams for various goals, such as image clustering, 3D scene reconstruction, and other big data applications. However, such tasks are not easy due to the fact the retrieved photos can have large variations in their view perspectives, resolutions, lighting, noises, and distortions. Furthermore, with the occlusion of unexpected objects like people, vehicles, it is even more challenging to find feature correspondences and reconstruct realistic scenes. In this paper, we propose a structure-based image …

A Small Molecule That Binds And Inhibits The Etv1 Transcription Factor Oncoprotein, Marius C. Pop, Nicolas Stransky, Colin W. Garvie, Jean-Philippe Theurillat, Emily C. Hartman, Timothy A. Lewis, Cheng Zhong, Elizabeth K. Culyba, Fallon Lin, Douglas S. Daniels, Raymond Pagliarini, Lucienne Ronco, Angela N. Koehler, Levi A. Garraway

Chemistry Faculty Publications

Members of the ETS transcription factor family have been implicated in several cancers, where they are often dysregulated by genomic derangement. ETS variant 1 (ETV1) is an ETS factor gene that undergoes chromosomal translocation in prostate cancers and Ewing's sarcomas, amplification in melanomas, and lineage dysregulation in gastrointestinal stromal tumors. Pharmacologic perturbation of ETV1 would be appealing in these cancers; however, oncogenic transcription factors are often deemed “undruggable” by conventional methods. Here, we used small-molecule microarray (SMM) screens to identify and characterize drug-like compounds that modulate the biological function of ETV1. We identified the 1,3,5-triazine small molecule BRD32048 as a …

Earnings Momentum Shifts And Stock Price Movements For Flyer Fund Stocks

Stander Symposium Projects

Earnings momentum is often considered a key factor in stock price movements. In this study we look at changes in the compound quarterly growth rates over periods of four and eight quarters, and relate these to the price movements of 30 stocks from the Flyer Fund Portfolio. The period of an analyses covers two years from 8-31-11 to 8-31-13. Using cross sectional regression analyses, we identified the statistical relationship between sector price movements and variations in the compound manual growth rate in earnings period. We test the hypothesis that the slop coefficient of the univariate regressions are positive (i.e. b …

Exploring Data-Driven Electricity Feedback On Energy Conservation Behavior In The University Of Dayton Student Neighborhood

Stander Symposium Projects

In general, homeowners do not have a concrete idea of how much energy their houses are using at any given moment. This energy “invisibility” is thought to be a barrier toward people adopting more sustainable behaviors. This study involves installing energy monitors in houses in the University of Dayton student neighborhood to analyze two important questions: whether the monitors teach students about the relationship between their activities and energy consumption, and whether the monitors influence students to adjust their household behaviors. Ideally, conclusions will be drawn from quantitative data collected from the monitors and the university’s energy provider as well …

Preparatory And Performance Self-Efficacy In Athletes

Stander Symposium Projects

Self-efficacy establishes a relationship between people and their goal-directed behavior. The relationship helps determine whether people will initiate the behavior and how long they will persist in performing the behavior. Specific types of self-efficacy are preparatory self-efficacy in relation to a certain task, (i.e., that is, self-perception of anticipated ability in successfully completing a task) and performance self-efficacy regarding that task. Specifically, the present study examined these two types of self-efficacy in response to the performance on spatial tasks that assessed the ability to take different perspectives and picture the movement of objects in space. Participants were given preparatory, performance, …

Research Exercise: Research On The Effect That Teacher Education Standards Have On Teacher Formation In The United States And Finland

Stander Symposium Projects

Standards for the teaching profession emphasize the importance of awareness, understanding, and integration into practice of current research in education. Our goal of the EDT 110H1 class project is to present syntheses of the effects on teacher professional development based on education standards in Finland and the United States.

Research Exercise: Research On Learning And The Brain

Stander Symposium Projects

Standards for the teaching profession emphasize the importance of awareness, understanding, and integration into practice of current research in education. The goal of the EDT 110H1 class project was to present syntheses of related literature on pertinent topics to p -12 education. Our research focuses on the brain's role learning in the areas of gender differences and the arts.

Serial Chains Of Spherical Four-Bar Mechanisms To Achieve Design Helices

Stander Symposium Projects

This research presents a methodology for designing mechanical chains comprised of a large number of identical spherical four-bar mechanisms. Such a mechanical chain can achieve up to five prescribed helices. A spherical four-bar mechanism is a single degree of freedom device consisting of four revolute (R) joints whose rotational axes intersect at a common point. The mechanical chains are created by connecting the coupler of the prior spherical mechanism to the base link of the subsequent spherical mechanism. An extension on each mechanism will lie along the prescribed helices as the device moves. The methodology introduces a companion helix to …

When Are Positive Views Of Myself Harmful? An Experimental Test Of Interactive Effects Of Self-Enhancement, Stress Severity, And Context Controllability On Mental Health

Stander Symposium Projects

A wide array of research has shown that people tend to view themselves in a positively biased manner, known as self-enhancement. Some findings show that self-enhancement promotes positive mental health, while others reveal that self-enhancement can be harmful to mental health. Recent research suggests that self-enhancement’s impact on mental health during negative experiences depends on context controllability and stress severity. It also suggests that one’s motivation to address the negative experience affects the mental outcomes manifested from self-enhancement. The main objectives of the present study are to a) experimentally examine how self-enhancement, stress severity, and context controllability interact to affect …

Research Exercise: Understanding The Common Core State Standards And Their Role In Catholic Education

Stander Symposium Projects

In 2009, the Common Core State Standards (CCSS) revolutionized academic standards, providing a format adopted by states across America that focused on raising Math and English Language Arts standards as preparation for colleges and careers. In conjunction with the adoption and implementation of the CCSS across the United States, Catholic schools have worked towards the strengthening and advancement of their own educational systems. This thesis first examines the background of the CCSS, including implementation and professional development, as well as the opposition regarding the standards. The paper presents an overview of the history of academic standards in Catholic education and …

A Hero's Journey: Aegean's Destiny

Stander Symposium Projects

A young woman named Aegean is summoned by the Oracle of her village to go on a journey to defeat an evil civilization at the center of the Three Villages. Though Aegean is independent, strong-willed, and assertive, she does not know her way. With the accompaniment of Maeve, a woman warrior, and Fumito, a cloistered sage, Aegean has a model of femininity and a model of masculinity to guide her in creating her own identity. They face perils on their quest, such as deadly creatures, private struggles – even death. Yet, while they travel they learn about the history of …

A Performance Analysis Of Concentrated Portfolios Of High Quality Stocks Over The Highly Volatile Market Period Of 2007 – 2013

Stander Symposium Projects

A number of investment managers use high quality stocks as a key to their investment strategy. In this study I want to look at the relative performance of concentrated portfolios (25-30 stocks) of high quality stocks compared to the S&P 500 (i.e. the benchmark portfolio). Using the S&P’s quality ratings of A- through A+, I developed the following concentrated portfolios: (1) Mega Large Cap (2) Large Cap and (3) Mid-Cap. Two time periods are evaluated performance wise: (1) 12-31-07 – 12-31-13 and (2) 3-31-09 – 12-31-13. The 07-13 time interval includes the steep down swing period in the market which …

Brain Machine Interface For Controlling A Robotic Arm

Stander Symposium Projects

This project takes Electroencephalography (EEG) data and correlates it with specific robotic actions. The process is implemented using a 3 phase system that includes EEG signal acquisition, data classification, and robotic action encoding. This project utilizes the Emotiv EPOC headset that uses 14 electrodes which detects brain activity and wirelessly transmits raw data to a personal computer. The project utilizes Emotiv software to classify and translate and encode this raw EEG signal into a command to control a robotic arm. This Brain Machine Interface (BMI) research has many potential applications; for example, it could help the handicapped use robots to …