Digital Commons Network^™

Hydrogen Infrastructure: Resource Evaluation And Capacity Modeling, Kevin B. Martin

Doctoral Dissertations

"A hydrogen economy could offer energy stability, economical, and environmental benefits. Several issues are involved in the design and implementation of a hydrogen economy such as the selection of feedstocks, generation and storage technologies, transportation methods, appropriate equipment capacity, codes/standards and public awareness. The design of a hydrogen infrastructure may seem insurmountable; however, as the system is deconstructed a proper design can be achieved. In order to better understand how a hydrogen system for light duty vehicles might operate, both hydrogen resource and capacity analysis and modeling is conducted. Specifically, an evaluation of leading near term production and distribution technologies …

Taproot™ Technology: Tree Coring For Fast, Noninvasive Plume Delineations, Joel Gerard Burken, Sallie Bailey, Matt Shurtliff, Jeff Mcdermott

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

In Efforts to Evaluate the Use of Plants as a Forensic Tool for Delineating Contaminated Soil and Groundwater, a Laboratory Experiment and a Field Sampling Effort Were Undertaken. Site Assessments Are Often Costly and Inaccurate, Requiring Multiple Mobilizations to Hone in on Source Areas and Getting Accurate Estimates of Contaminant Extent and Distribution. as These Extensive Site Delineations Take Place, Valuable Time and Resources Are Lost. the Findings of This Study Show that Plants Can Be Used as a Tool to Evaluate a Variety of Subsurface Contaminants, Either in the Vadose Zone or in the Saturated Zone. in the First …

Analysis Of Privacy And Security Policies, Elisa Bertino, Carolyn Brodie, Seraphin Calo, Lorrie Faith Cranor, Clare Marie Karat, John Karat, Ninghui Li, Dan Lin, Jorge Lobo, Qun Ni, Prathima Rao, Xiping Wang

Computer Science Faculty Research & Creative Works

The distributed nature of the environment in which privacy and security policies operate requires tools that help enforce consistency of policy rules across different domains. Furthermore, because changes to policy rules are required as policies evolve over time, such tools can be used by policy administrators to ensure the consistency of policy changes. in this paper, we describe a number of different policy analysis tools and techniques that we have developed over the years and present them in a unified framework in which both privacy and security policies are discussed. We cover dominance analyses of general policies, conflicts among authorizations …

Maxwell Garnett Rule For Dielectric Mixtures With Statistically Distributed Orientations Of Inclusions, Marina Koledintseva, Richard E. Dubroff, Robert W. Schwartz

Electrical and Computer Engineering Faculty Research & Creative Works

An analytical model of an effective permittivity of a composite taking into account statistically distributed orientations of inclusions in the form of prolate spheroids will be presented. In particular, this paper considers the normal Gaussian distribution for either zenith angle, or azimuth angle, or for both angles describing the orientation of inclusions. The model is an extension of the Maxwell Garnett (MG) mixing rule for multiphase mixtures. The resulting complex permittivity is a tensor in the general case. The formulation presented shows that the parameters of the distribution law for orientation of inclusions affect the frequency characteristics of the composites, …

Labor Flexibility, Legal Reform And Economic Development, Alvaro Santos

Georgetown Law Faculty Publications and Other Works

The current global financial crisis has provoked intense criticism of the regulatory framework for financial markets. Financial market flexibility, once considered the key to successful financial institutions and economic growth, has now come under intense scrutiny. In contrast, labor market flexibility is still promoted by scholars and international policymakers as an essential part of the recipe for economic development. This Article argues that the predominant understanding of labor flexibility is misguided and needs to be revised. To illustrate why, the Article undertakes a critical examination of labor flexibility as developed by a leading World Bank project, called “Doing Business.” It …

Quality Of Service Provisioning Through Resource Allocation And Data Aggregation In Wireless Sensor Networks, Carl Larsen

Doctoral Dissertations

"In this dissertation, improvement of quality of service (QoS) provisioning in wireless sensor networks (WSN) is examined using four different methods. The first two focus on allocation of limited resources in the face of changing network and channel conditions, and thus improving performance in terms of throughput and delay. The second two methods focus on using data aggregation to minimize the size and number of packet transmissions reducing the energy consumption and improving network lifetime.

Therefore, in the first paper a novel adaptive and distributed fair scheduling (ADFS) protocol for WSN is presented that allocates the channel bandwidth in proportion …

Modeling And Analysis Of Noise Coupling In Multilayer Power/Ground Planes, Gang Feng

Doctoral Dissertations

"The simultaneous switching noise (SSN) in a multilayer power delivery network (PDN) is a critical problem in high-speed printed circuit board (PCB) designs. Full-wave methods are not computationally efficient for analyzing PCB structures normally with a multi-scale nature. In this thesis, a model for multilayer power/ground planes is proposed using basic plane pair blocks derived from the cavity model combined with the segmentation technique. Vias and other circuit elements can further be easily integrated in the multilayer plane model. As a result, the entire PDN model is much more computationally efficient than full-wave methods. Experimental and numerical results have validated …

Applications Of Sensor Arrays In Acoustic And Seismic Signal Processing, Peng Xie

Doctoral Dissertations

"This work investigates the applications of sensor arrays in the areas of acoustic and seismic signal processing. It comprises three papers.

The first paper explores the problem of blind source separation (BSS) for convolutive acoustic signals. It concentrates on the well known permutation and amplitude problems in frequency-domain BSS and proposes a new hybrid approach to solve them. This approach connects the separation processes across all frequency bins, and relies on a novel permutation control unit. This framework could greatly reduce computational load and improve separation performance. Synthesized and real-world experiments demonstrate its efficiency.

The second paper investigates a new …

Fundamentals Of Friction Stir Spot Welding, Harsha Badarinarayan

Doctoral Dissertations

"The recent spike in energy costs has been a major contributor to propel the use of light weight alloys in the transportation industry. In particular, the automotive industry sees benefit in using light weight alloys to increase fuel efficiency and enhance performance. In this context, light weight design by replacing steel with Al and/or Mg alloys have been considered as promising initiatives. The joining of structures made of light weight alloys is therefore very important and calls for more attention. Friction Stir Spot Welding (FSSW) is an evolving technique that offers several advantages over conventional joining processes.

The fundamentals aspects …

On Unified Computational Intelligence: Neural Networks, Dynamic Programming, And Applications To Economics And Finance, John E. Seiffertt Iv

Doctoral Dissertations

"This dissertation introduces the concept of unified computational intelligence and encompasses algorithm design, applications, theoretical developments, and the identification of new frontiers for multidisciplinary research. It presents a new way to look at unified learning systems and presents a novel Adaptive Resonance Theory-based unified learning architecture. An application to robotic security and sensor fusion is given in detail.

Work on the theoretical developments of unified computational intelligence is also presented. A new theorem in the time scales calculus is proven and theorems on the Hamilton-Jacobi-Ballman equation of dynamic programming and the dynamic programming algorithm are presented, both for various general …

Tennessee Archivist 32, No. 1, Society Of Tennessee Archivists

Tennessee Archivist newsletters

Winter 2009 issue of the Tennessee Archivist, a newsletter produced by the Society of Tennessee Archivists.

On Capturing The Possible Significance Of Institutional Design And Ethos, Peter L. Strauss

Faculty Scholarship

At a recent conference, a new judge from one of the federal courts of appeal – for the United States, the front line in judicial control of administrative action-made a plea to the lawyers in attendance. Please, he urged, in briefing and arguing cases reviewing agency actions, help us judges to understand their broader contexts. So often, he complained, the briefs and arguments are limited to the particular small issues of the case. We get little sense of the broad context in which it arises – the agency responsibilities in their largest sense, the institutional issues that may be at …

Contracting For Innovation: Vertical Disintegration And Interfirm Collaboration, Ronald J. Gilson, Charles F. Sabel, Robert E. Scott

Faculty Scholarship

Rapidly innovating industries are not behaving the way theory expects. Conventional industrial organization theory predicts that, when parties in a supply chain have to make transaction-specific investments, the risk of opportunism will drive them away from contracts and toward vertical integration. Despite the conventional theory, however, contemporary practice is moving in the other direction. Instead of vertical integration, we observe vertical disintegration in a significant number of industries, as producers recognize that they cannot themselves maintain cutting-edge technology in every field required for the success of their products. In doing this, the parties are developing forms of contracting beyond the …

Heller High Water? The Future Of Originalism, Jamal Greene

Faculty Scholarship

Has originalism won? It's easy to think so, judging from some of the reaction to the Supreme Court's recent decision in District of Columbia v. Heller. The Heller Court held that the District of Columbia could neither ban possession of handguns nor require that all other firearms be either unloaded and disassembled or guarded by a trigger lock. In finding for the first time in the Court's history that a gun control law violated the Second Amendment, Justice Scalia's opinion for the 5-4 majority appeared to be a sterling exemplar of originalism, the method of constitutional interpretation that he …

Design Complexity And Its Relationship With Sn Ratio - Larger-The-Better Characteristics With Finite Target, Naresh K. Sharma, Elizabeth A. Cudney, Sonali Sharma

Engineering Management and Systems Engineering Faculty Research & Creative Works

The concept of complexity is an essential constituent of axiomatic design and axiomatic quality. a reciprocal transformation is used to compute quality loss for larger-the-better performance characteristics in Taguchi's methodology. El-Haik's work on connecting robust design and axiomatic design with the help of mathematical relationships also considers the reciprocal methodology for larger-the-better functional requirements. Because of reciprocal transformation axiomatic complexity formulation for larger-the-better performance characteristics is different from that for smaller-the-better and nominal-the-best characteristics. Second, the signal-to-noise ratio based on complexity is also different for the same reason. This paper shows that a simple linear transformation in which a finite …

Predicting Gas Mileage Using The T-Method, Parthiv Shah, Elizabeth A. Cudney, Vivek Jikar

Engineering Management and Systems Engineering Faculty Research & Creative Works

The T-method is a technique developed by Genichi Taguchi to calculate an overall prediction based on the signal-to-noise ratio without the use of Gram-Schmidt orthogonalization. the Taguchi methods, also known as Robust Design principles, are used for optimization through planning, conducting, and evaluating the results of experiments to determine the best levels of control factors. the primary goal of Robust Design is to minimize variance in the presence of noise factors to achieve a robust process. This paper outlines the T-method steps using a forecasting case study to calculate miles per gallon for vehicles with a univariate response to illustrate …

On The Origins Of Originalism, Jamal Greene

Faculty Scholarship

For all its proponents' claims of its necessity as a means of constraining judges, originalism is remarkably unpopular outside the United States. Recommended responses to judicial activism in other countries more typically take the form of minimalism or textualism. This Article considers why. Ifocus particular attention on the political and constitutional histories of Canada and Australia, nations that, like the United States, have well-established traditions of judicial enforcement of a written constitution, and that share with the United States a common law adjudicative norm, but whose political and legal cultures less readily assimilate judicial restraint to constitutional historicism. I offer …

Decentralized Adaptive Neural Network Control Of Interconnected Nonlinear Dynamical Systems With Application To Power System, Shahab Mehraeen

Doctoral Dissertations

"Traditional nonlinear techniques cannot be directly applicable to control large scale interconnected nonlinear dynamic systems due their sheer size and unavailability of system dynamics. Therefore, in this dissertation, the decentralized adaptive neural network (NN) control of a class of nonlinear interconnected dynamic systems is introduced and its application to power systems is presented in the form of six papers. In the first paper, a new nonlinear dynamical representation in the form of a large scale interconnected system for a power network free of algebraic equations with multiple UPFCs as nonlinear controllers is presented. Then, oscillation damping for UPFCs using adaptive …

Novel Optofluidic Sensor Systems For Quantitative Chemical Imaging And On-Chip Sensor Calibration, Jongwon Park

Doctoral Dissertations

"The design, fabrication and characterization of optofluidic biosensor systems for quantitative oxygen imaging with a color charge-coupled device (CCD) camera as well as on-chip self-calibration of sensors utilizing gas bubbles was investigated. This dissertation was prepared in publication format. The first and second papers demonstrate that color imaging devices can be used in quantitative chemical analysis. The final paper explores the feasibility of using electrolytically generated bubbles for a novel functionality of reagentless, on-chip, in situ calibration of optical biosensors. Work in the first paper includes the use of a color CCD camera for fluorescence intensity imaging. This involves extracting …

Real-Time And Portable Microwave Imaging System, Mohammad Tayeb Ahmad Ghasr

Doctoral Dissertations

"Microwave and millimeter wave imaging has shown tremendous utility in a wide variety of applications. These techniques are primarily based on measuring coherent electric field distribution on the target being imaged. Mechanically scanned systems are the simple and low cost solution in microwave imaging. However, these systems are typically bulky and slow. This dissertation presents a design for a 2D switched imaging array that utilizes modulated scattering techniques for spatial multiplexing of the signal. The system was designed to be compact, coherent, possessing high dynamic range, and capable of video frame rate imaging. Various aspects of the system design were …

In Brief

In Brief

Table of Contents:

• From the Dean's Desk (Robert H. Rawson, Jr.)
• Masthead
• We, the Paparazzi: Privacy in the Facebook Generation
• Clinical Education Gives Everyone a Voice
• Revolutionizing the Way We Teach Law Students
• Memo to the New President: End the Separation of Corporate Ownership and Control
• Ashcroft v. Iqbal
• Profile (Henry King)
• News
• Prosecuting War Lord and Khmer Rouge Leaders
• Helping Minority Students Become Lawyers
• Faculty Briefs
• Rebuilding New Orleans
• Alumni Spotlight Fred Weisman ADL '48, LAW '51
• Retirement Savings -- Is There Another Way?
• Alumni Events
• Class Notes
• In Memoriam the Legacy of Emeritus Law Professor Oliver C. Schroeder, …

Optical Intensity-Based Long-Period Fiber Grating Biosensors And Biomedical Applications, Zhiyong Wang, Hai Xiao

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

New Techniques For Measuring Impedance Characteristics Of Three-Phase Ac Power Systems, Yakov A. Familiant, Keith Corzine

Electrical and Computer Engineering Faculty Research & Creative Works

Naval ships as well as aerospace power systems are incorporating an increasing amount of power electronic switching sources and loads. Although these power-electronics-Based components provide exceptional performance, they are prone to instability due to their constant power characteristics that lead to negative impedance. When designing these systems, integrators must consider the impedance versus frequency at a power system interface (which designates source and load). Stability criteria have been developed in terms of source and load impedance for both dc and ac power systems, and it is often helpful to have techniques for impedance measurement. for dc power systems, the measurement …

V2g Scheduling - A Modern Approach To Unit Commitment With Vehicle-To-Grid Using Particle Swarm Optimization, Ahmed Yousuf Saber, Ganesh K. Venayagamoorthy

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents a new approach to Vehicle-to-Grid (V2G) scheduling. V2G technology has drawn great interest in the recent years. It can efficiently manage load fluctuation, peak load; however, it increases spinning reserves and reliability. V2G can reduce dependencies on small expensive units in the existing power systems as energy storage that can decrease running costs. Success of the V2G research depends on efficient scheduling of grid able vehicles in limited parking lots. as number of grid able vehicles in V2G is much higher than small units of existing systems, unit commitment (UC) with V2G is more complex than basic …

Optimal Tracking Control Of Affine Nonlinear Discrete-Time Systems With Unknown Internal Dynamics, Travis Dierks, Sarangapani Jagannathan

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, direct dynamic programming techniques are utilized to solve the Hamilton Jacobi-Bellman equation forward-in-time for the optimal tracking control of general affine nonlinear discrete-time systems using online approximators (OLA's). the proposed approach, referred as adaptive dynamic programming (ADP), is utilized to solve the infinite horizon optimal tracking control of affine nonlinear discrete-time systems in the presence of unknown internal dynamics and a known control coefficient matrix. the design is implemented using OLA's to realize the optimal feedback control signal and the associated cost function. the feedforward portion of the control input is derived and approximated using an additional …

Improved Frequency Domain Channel Estimation And Equalization For Mimo Wireless Communications, Jian Zhang, Yahong Rosa Zheng

Electrical and Computer Engineering Faculty Research & Creative Works

This paper introduces an improved frequency domain channel estimation method based on interpolation vectors for single carrier frequency domain equalization (SC-FDE) with the multiple-input multiple-output (MIMO) scheme. the proposed algorithm is derived by employing the least squares (LS) criterion, and a specified application for the wide sense stationary uncorrelated scattering (WSSUS) Rayleigh fading channel is presented. the channel frequency domain responses estimated at two adjacent pilot blocks are used to track the time-variant channel information, which can effectively improve the accuracy of channel estimation without significantly increasing complexity. Maximum mean square error (MMSE) frequency domain equalization based on the estimated …

Physics-Based Via And Trace Models For Efficient Link Simulation On Multilayer Structures Up To 40 Ghz, Renato Rimolo-Donadio, Xiaoxiong Gu, Young H. Kwark, Mark B. Ritter, Bruce Archambeault, Francesco De Paulis, Yaojiang Zhang, Jun Fan, Heinz Dietrich Brüns, Christian Schuster

Electrical and Computer Engineering Faculty Research & Creative Works

Analytical models for vias and traces are presented for simulation of multilayer interconnects at the package and printed circuit board levels. Vias are modeled using an analytical formulation for the parallel-plate impedance and capacitive elements, whereas the trace-via transitions are described by modal decomposition. It is shown that the models can be applied to efficiently simulate a wide range of structures. Different scenarios are analyzed including thru-hole and buried vias, power vias, and coupled traces routed into different layers. by virtue of the modal decomposition, the proposed method is general enough to handle structures with mixed reference planes. for the …

Melting Of Major Glaciers In The Western Himalayas: Evidence Of Climatic Changes From Long Term Msu Derived Tropospheric Temperature Trend (1979-2008), Anup K. Prasad, Keun-Hang Susan Yang, Hesham El-Askary, Menas Kafatos

Mathematics, Physics, and Computer Science Faculty Articles and Research

Global warming or the increase of the surface and atmospheric temperatures of the Earth, is increasingly discernible in the polar, sub-polar and major land glacial areas. The Himalayan and Tibetan Plateau Glaciers, which are the largest glaciers outside of the Polar regions, are showing a large-scale decrease of snow cover and an extensive glacial retreat. These glaciers such as Siachen and Gangotri are a major water resource for Asia as they feed major rivers such as the Indus, Ganga and Brahmaputra. Due to scarcity of ground measuring stations, the long-term observations of atmospheric temperatures acquired from the Microwave Sounding Unit …

Radiative Transfer Theory Applied To Ocean Bottom Modeling, Lisa M. Zurk, Jorge Quijano

Electrical and Computer Engineering Faculty Publications and Presentations

Research on the propagation of acoustic waves in the ocean bottom sediment is of interest for active sonar applications such as target detection and remote sensing. The interaction of acoustic energy with the sea floor sublayers is usually modeled with techniques based on the full solution of the wave equation, which sometimes leads to mathematically intractable problems. An alternative way to model wave propagation in layered media containing random scatterers is the radiative transfer RT formulation, which is a well established technique in the electromagnetics community and is based on the principle of conservation of energy. In this paper, the …

Seven-Level Shunt Active Power Filter For High-Power Drive Systems, Peng Xiao, Ganesh K. Venayagamoorthy, Keith Corzine

Electrical and Computer Engineering Faculty Research & Creative Works

In high-power adjustable-speed motor drives, such as those used in electric ship propulsion systems, active filters provide a viable solution to mitigating harmonic related issues caused by diode or thyristor rectifier front-ends. To handle the large compensation currents and provide better thermal management, two or more paralleled semiconductor switching devices can be used. In this paper, a novel topology is proposed where two active filter inverters are connected with tapped reactors to share the compensation currents. The proposed active filter topology can also produce seven voltage levels, which significantly reduces the switching current ripple and the size of passive components. …