Digital Commons Network^™

A Systematic Approach For Human Communication, James Wilmot Jensen

Theses and Dissertations

No abstract provided.

First Observations Of So2 From The Satellite Suomi Npp Omps: Widespread Air Pollution Events Over China, Kay Yang, Russell Dickerson, Simon Carn, Cui Ge, Jun Wang

Department of Earth and Atmospheric Sciences: Faculty Publications

Severe smog episodes over China in January 2013 received worldwide attention. This air pollution was distinguished by heavy loadings of fine particulate matter and SO₂. To characterize these episodes, we employed the Ozone Mapping and Profiler Suite, Nadir Mapper (OMPS NM), an ultraviolet (UV) spectrometer flying on the Suomi National Polar-orbiting Partnership (SNPP) spacecraft since October 2011. We developed an advanced algorithm to quantify SO₂ in the lower troposphere and achieved highquality retrievals from OMPS NM, which are characterized by high precision, ~0.2 Dobson Units (DU; 1 DU = 2.69x1016 molecules/cm2) for instantaneous field of view SO …

A Hermeneutic Phenomenological Study Of Non-Completers In Online Doctor Of Education Programs, Bernadette Wyman

Doctoral Dissertations and Projects

The chance of an individual completing a traditional doctorate program is 50% (Bowen & Rudenstine, 1992; Council of Graduate Schools Ph.D. Completion Project, 2008; Ivankova & Stick, 2007). Student attrition in online programs is 10% to 20% greater than that of traditional, residential programs (Allen & Seaman, 2010; Carr, 2000; Diaz, 2000; DiRamio & Wolverton, 2006; Parker, 1999; Rovai, 2002). While doctoral attrition rates have been examined for decades, little research focuses on the phenomenon of attrition with doctoral candidates who enrolled in online graduate programs (Perry, Boman, Care, Edwards & Park, 2008). The phenomenon of attrition is multifaceted and …

Rethinking Discipleship In The Area Of High School Ministry: Key Strategies For Transforming Urban Youth, Michael Rackley

Doctoral Dissertations and Projects

According to a Barna Research Group study titled "Third Millennium Teens" 60% of young people will leave the church permanently or for an extended period. Decreasing the number of urban youth ages 14-18 from defecting from the church and to increase retention of church dropouts using Twenty-First Century transformational strategies is the goal of this project. Having served as a youth pastor the writer will analyze key strategies that will benefit high school ministry by raising the bar on expectations and by building future leaders in the church.

This project will include an anonymous survey of 125 participants aged 18-24 …

Exploring Factors That Contribute To Academic Persistence For Undergraduate Hispanic Nontraditional Students At Hispanic Serving Institutions In The Southeast, Floralba Arbelo Marrero

Doctoral Dissertations and Projects

This study examined the academic persistence of 10 undergraduate Hispanic nontraditional students enrolled at a public and a private not for profit Hispanic Serving Institution in the southeastern region of the United States, each in their last year of a bachelor degree program. Using a phenomenological research design and an ecological and sociocultural framework the findings indicated that family context, personal aspirations, campus environment within Hispanic Serving Institutions, life challenges, and English language learning each play a vital role in the persistence behaviors of this population. These factors interact at the student and institutional levels to provide students with internal …

Wave Propagation In Metamaterial Using Multiscale Resonators By Creating Local Anisotropy, Raiz U. Ahmed, Sourav Banerjee

Faculty Publications

Directional guiding, passing or stopping of elastic waves through engineered materials have many applications to the engineering fields. Recently, such engineered composite materials received great attention by the broader research community. In elastic waves, the longitudinal and transverse motion of material particles are coupled, which exhibits richer physics and demands greater attention than electromagnetic waves and acoustic waves in fluids. Waves in periodic media exhibit the property of Bragg scattering and create frequency band gaps in which the energy propagation is prohibited. However, in addition to the Bragg scattering, it has been found that local resonance of artificially designed resonators …

Simulation Studying Effects Of Multiple Primary Aberrations On Donut-Shaped Gaussian Beam, Chen Zhang, K. Wang, J. Bai, Y. Liu, Guiren Wang

Faculty Publications

In this paper, we demonstrate the variation of donut-shaped depletion pattern which influenced by multiple primary aberrations. The simulation is base on a common stimulation emission of depletion (STED) system composed by Gaussian laser and vortex phase plate. The simulation results are helpful guidelines for analyzing the aberration of depletion patterns in real situations.

An Acid Catalyzed Reversible Ring-Opening/Ring-Closure Reaction Involving A Cyano-Rhodamine Spirolactam, H. Li, H. Guan, X. Duan, J. Hu, Guiren Wang, Qian Wang

Faculty Publications

Cyanamide was introduced into the rhodamine spirolactam framework to produce a colorless and non-fluorescent compound RBCN. It shows a reversible ring-opening/ring-closure process in response to the solution pH, which exhibits an “ON/OFF” switching in its fluorescence. Different from other rhodamine-type dyes, the ring-open form of RBCN is stable in protic solvents under neutral, near neutral and basic conditions, showing a pink color and very strong fluorescence. We also demonstrated the potential of RBCN in live cell imaging.

Resilience Experiments On The Gpeni Testbed, Egemen K. Çetinkaya, Dongsheng Zhang, Mohammed J. F. Alenazi, Yufei Cheng, Parker Riley, James P. G. Sterbenz

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

Water Management Capabilities Of Bio-Inspired Flow Field Configurations For Polymer Electrolyte Membrane Fuel Cells, Nicholas Warren Freer

Masters Theses

"Fuel cells have received an increasing amount of attention over the past decade for their power production capabilities. Polymer electrolyte membrane (PEM) fuel cells in particular are researched because of their high power density, large range of operating conditions, green products, and ease of scalability. PEM fuel cells do have a number of issues that reduce their overall performance. These issues include variations in reactant distribution, materials issues for the bipolar plate, and flooding caused by poor water management. Variations in the reactant distribution causes lower overall power output due to regions of low reactant density. This means that optimizing …

Dental Student Indebtedness: Where Did It Come From And Where Will It Lead?, Gary L. Stafford

School of Dentistry Faculty Research and Publications

Today’s dental school graduates are burdened by an ever-increasing amount of student loan debt from both their undergraduate and predoctoral educations. Although considered to be multifactorial in origin, this article explores the microeconomic theory of supply and demand as a source for rising tuition costs and subsequent educational debt. The historical context for the cost of a dental education is provided, and serious questions are posed about how this indebtedness might impact the future of the profession.

Integration Of Arbitrary Lumped Multiport Circuit Networks Into The Discontinuous Galerkin Time-Domain Analysis, Ping Li, Li Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

A hybrid electromagnetic (EM) circuit simulator is proposed for incorporating multiport lumped circuit networks through their admittance matrices into the discontinuous Galerkin time-domain (DGTD) method. The admittance matrix in the Laplace domain can be derived analytically or obtained from network parameters such as -parameters in the frequency domain. To convert frequency-dependent -parameters into the admittance matrix in the Laplace domain, the vector-fitting technique is employed to facilitate the mapping process. The computational domain of interest is split into two subdomains. One is the EM part solved by the DGTD, and another is the circuit part modeled by the basic I-V …

Magneto-Electric Dipole Antenna Based On Differentially-Excited Composite Right/Left-Handed (Crlh) Transmission Lines, S. Gupta, Lijun Jiang, C. Caloz

Electrical and Computer Engineering Faculty Research & Creative Works

A new magneto-electric (ME) dipole antenna array is proposed which provides a combined electric- and magnetic-dipole response in a planar configuration. The proposed structure is based on Composite Right/Left-Handed (CRLH) transmission lines, which is differentially fed and operated in the zeroth-order regime to provide maximal gain for the combined radiators. The basic principle of the proposed ME-dipole antenna is discussed and demonstrated with full-wave simulation results. © 2013 IEEE.

The Numerical Steepest Descent Path Method For Calculating Physical Optics Integrals On Smooth Conducting Quadratic Surfaces, Yu Mao Wu, Li (Lijun) Jun Jiang, Wei E.I. Sha, Weng Cho Chew

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, we use the numerical steepest descent path (NSDP) method to analyze the highly oscillatory physical optics (PO) integral on smooth conducting parabolic surfaces, including both monostatic and bistatic cases. Quadratic variations of the amplitude and phase functions are used to approximate the integrand of PO integral. Then the surface PO integral is reduced into several highly oscillatory line integrals. By invoking the NSDP method, these highly oscillatory PO line integrals are defined on the corresponding NSDPs. Furthermore, the critical point contributions for the PO integral are exactly extracted and represented based on the NSDPs. The proposed NSDP …

A Systematic Electromagnetic-Circuit Method For Emi Analysis Of Coupled Interconnects On Dispersive Dielectrics, Min Tang, Jiaqing Lu, Junfa Mao, Lijun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents a systematic electromagnetic-circuit method for efficient simulation of coupled interconnects on dispersive dielectrics in the presence of electromagnetic interference. The dispersive substrate of coupled interconnects is characterized by the multiterm Debye or Lorentz formula. According to the differential equations derived from the equivalent circuit modeling of dispersive media, the full-wave finite-difference time-domain algorithm is utilized to capture accurate field in a dispersive substrate. The effects of incident field, under the quasi-TEM assumption, are then represented by the distributed sources along transmission lines. An efficient algorithm based on the waveform relaxation with transverse partitioning (WR-TP) is employed for …

Skin-Effect Loss Models For Time- And Frequency-Domain Peec Solver, Albert E. Ruehli, Giulio Antonini, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

A challenging and interesting issue for the solution of large electromagnetic problems is the efficient, sufficiently accurate modeling of the broadband skin-effect loss for conducting planes and 3-D shapes. The inclusion of such models in an electromagnetic (EM) solver can be very costly in compute time and memory requirements. These issues are particularly important for the class of signal, power, and noise integrity (NI) problems. In this paper, we concentrate on partial element equivalent circuit (PEEC)-type methods which are suitable for the solution of this class of problems. Progress has been made recently in the design of skin-effect models. The …

Overview Of Large-Scale Computing: The Past, The Present, And The Future, Weng Cho Chew, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

This is a brief review of the development of computational electromagnetics (CEM) to partially summarize its achievements, issues, and possibilities. © 1963-2012 IEEE.

Robustness Of A Derivative-Free Adaptive Control Law In The Presence Of Unmodeled Dynamics, Tansel Yucelen, Anthony J. Calise

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Although adaptive control theory offers mathematical tools to achieve required system performance without excessive dependence on modeling, its application to safety-critical systems can be limited by the presence of unmodeled dynamics. This paper examines the robustness to unmodeled dynamics of a recently developed derivative-free adaptive control law. In contrast to derivative-based adaptive laws it is shown, using a Lyapunov-Krasovskii functional, that robustness to unmodeled dynamics is improved by increasing the adaptation gain. This is accomplished by including a bias term in the set of basic functions employed by the adaptive control law. It is shown that derivative-based adaptive laws do …

Neuropredictive Control And Trajectory Generation For Slung Load Systems, Gerardo De La Torre, Eric N. Johnson, Tansel Yucelen

Mechanical and Aerospace Engineering Faculty Research & Creative Works

This paper presents a neuropredictive trajectory generation architecture for slung load systems. The presented architecture integrates the real-time trajectory generation method with a system uncertainty identifying neural network. It is shown that the effect of system uncertainty on a model predictive control approach can be mitigated by the use of neural networks. A numerical example of an uncertain slung load system is shown to demonstrate the effectiveness of the presented framework.

Consensus Protocols For Networked Multiagent Systems With Relative Position And Neighboring Velocity Information, Gerardo De La Torre, Tansel Yucelen, Eric N. Johnson

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The consensus problem appears frequently in the coordination of multiagent systems in science and engineering and involves the agreement of networked agents upon certain quantities of interest. In this paper, we focus on a new consensus protocol for networked multiagent systems. The proposed control protocol consists of a standard term capturing relative position information and a new term capturing neighboring velocity information. In particular, the addition of the latter term results in an increase of the rate of system convergence while maintaining a fixed graph structure and without increasing the maximum eigenvalue of the graph Laplacian. Furthermore, in certain cases, …

Separate-Channel Integrated Guidance And Autopilot For Automatic Path-Following, Takeshi Yamasaki, S. N. Balakrishnan, Hiroyuki Takano

Mechanical and Aerospace Engineering Faculty Research & Creative Works

An integrated guidance and autopilot scheme for a path-following uninhabited aerial vehicle is presented in this study. A fixed-wing aircraft usually performs a bank-to-turn maneuver to change its flight direction. The novel approach presented here, however, assumes that each of the three channels of the integrated guidance and autopilot can be independently designed. This concept makes the design process simple. A virtual target moving on the prespecified path for the uninhabited aerial vehicle is introduced to facilitate the algorithm development. A first-/ second order sliding structure with a second order sliding mode and a high-order sliding mode differentiator for the …

The Global Land Rush: Markets, Rights, And The Politics Of Food, Smita Narula

Elisabeth Haub School of Law Faculty Publications

In the past five years, interest in purchasing and leasing agricultural land in developing countries has skyrocketed. This trend, which was facilitated by the 2008 food crisis, is led by state and private investors, both domestic and foreign. Investors are responding to a variety of global forces: Some are securing their own food supply, while others are capitalizing on land as an increasingly promising source of financial returns. Proponents argue that these investments can support economic development in host states while boosting global food production. But critics charge that these “land grabs” disregard land users' rights and further marginalize already …

Complete Issue, Gla Glq

Georgia Library Quarterly

No abstract provided.

Teaching Government Information In Information Literacy Credit Classes, Emily Rogers

Georgia Library Quarterly

This paper reviews the teaching of credit-bearing information literacy courses and government information, reports questionnaire responses from librarians who teach these courses, and argues that revising the ways we teach government information in for-credit courses will help students achieve information literacy. A focus on government information as critical thinking and subject access resources, rather than as unique documents collections or formats, can remove barriers for researchers, particularly in classes that allow students an entire term to develop skills. In addition, librarians will increase their comfort levels addressing government information and develop ways to teach students to use these resources within …

Litigation-Fostered Bureaucratic Autonomy: Administrative Law Against Political Control, Daniel E. Walters

Faculty Scholarship

The idea of political control dominates our understanding of both what administrative law does and what it should do. This emphasis on political control, however, downplays the important ways that administrative law facilitates resistance to political control in administrative agencies. In this article, I offer studies of two instances in which agencies harnessed the power of seemingly standard administrative law litigation to resist the imposition of policies by political leadership. I classify these kinds of modes of resistance as instances of “litigation-fostered bureaucratic autonomy” and flesh out the mechanisms that drive the process. Acknowledging the role of such modes of …

Seqnls: Nuclear Localization Signal Prediction Based On Frequent Pattern Mining And Linear Motif Scoring, J.-R. Lin, Jianjun Hu

Faculty Publications

Nuclear localization signals (NLSs) are stretches of residues in proteins mediating their importing into the nucleus. NLSs are known to have diverse patterns, of which only a limited number are covered by currently known NLS motifs. Here we propose a sequential pattern mining algorithm SeqNLS to effectively identify potential NLS patterns without being constrained by the limitation of current knowledge of NLSs. The extracted frequent sequential patterns are used to predict NLS candidates which are then filtered by a linear motif-scoring scheme based on predicted sequence disorder and by the relatively local conservation (IRLC) based masking.

The experiment results on …

A Dialogical Approach To Trade And Environment, Elizabeth Trujillo

Faculty Scholarship

Traditionally, supporters of free trade and environmentalists have regarded each other as the obstacle to development, and both sides have very different views as to what constitutes development. This article considers the various dimensions to international trade governance in the context of the environment and draws from the dialogic theory in comparative constitutional law to frame trade governance regarding the environment in a new way. It uses a dialogical approach to highlight primarily three characteristics of the international trade regime that has fostered enhanced cross-fertilization of trade and environmental issues: (i) the adjudicatory capacity of the World Trade Organization (WTO) …

Reflection-Based Phase-Shifted Long Period Fiber Grating For Simultaneous Measurement Of Temperature And Refractive Index, Jie Huang, Xinwei Lan, Amardeep Kaur, Haining Wang, Lei Yuan, Hai Xiao

Electrical and Computer Engineering Faculty Research & Creative Works

We report a reflection-based phase-shifted long period fiber grating (PS-LPFG) and demonstrate its capability for simultaneous measurement of temperature and external reflective index (RI). The sensor device comprises a grating directly written by CO₂ laser and silver-coated end face. A π-shifted LPFG is presented with two attenuation bands through its reflection spectrum. These two bands have different sensitivity towards temperature and external RI that can be used for simultaneous measurement of the two variables. The experimental results show that this probe-type PS-LPFG performs well in terms of linearity and sensitivity.

Mountain-Plains Consortium Annual Report 2013

UGPTI Mountain Plains Consortium Annual Reports

No abstract provided.

State Courts And Transitory Torts In Transnational Human Rights Cases, Chimène Keitner

Faculty Scholarship

No abstract provided.