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Four-Dimensional Reflectivity Data Comparison Between Two Ground-Based Radars: Methodology And Statistical Analysis, Bong Chul Seo, Witold F. Krajewski, James A. Smith Jan 2014

Four-Dimensional Reflectivity Data Comparison Between Two Ground-Based Radars: Methodology And Statistical Analysis, Bong Chul Seo, Witold F. Krajewski, James A. Smith

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

A methodology is proposed to compare radar reflectivity data obtained from two partially overlapping ground-based radars in order to explain relative differences in radar-rainfall products and establish sound merging procedures for multi-radar observing networks. To identify radar calibration differences, radar reflectivity is compared for well-matched radar sampling volumes viewing common meteorological targets. Temporal separation and three-dimensional matching of two different sampling volumes were considered based on the original polar coordinates of radar observation. Since the proposed method assumes radar beam propagation under standard atmospheric conditions, anomalous propagation cases were eliminated from the analysis. The reflectivity comparison results show systematic differences …


Spatial And Temporal Modeling Of Radar Rainfall Uncertainties, Gabriele Villarini, Bong Chul Seo, Francesco Serinaldi, Witold F. Krajewski Jan 2014

Spatial And Temporal Modeling Of Radar Rainfall Uncertainties, Gabriele Villarini, Bong Chul Seo, Francesco Serinaldi, Witold F. Krajewski

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

It is widely acknowledged that radar-based estimates of rainfall are affected by uncertainties (e.g., mis-calibration, beam blockage, anomalous propagation, and ground clutter) which are both systematic and random in nature. Improving the characterization of these errors would yield better understanding and interpretations of results from studies in which these estimates are used as inputs (e.g., hydrologic modeling) or initial conditions (e.g., rainfall forecasting). Building on earlier efforts, the authors apply a data-driven multiplicative model in which the relationship between true rainfall and radar rainfall can be described in terms of the product of a systematic and random component. The systematic …


Analysis And Optimization Of A Protocol For Mobile Element Discovery In Sensor Networks, Francesco Restuccia, Giuseppe Anastasi, Marco Conti, Sajal K. Das Jan 2014

Analysis And Optimization Of A Protocol For Mobile Element Discovery In Sensor Networks, Francesco Restuccia, Giuseppe Anastasi, Marco Conti, Sajal K. Das

Computer Science Faculty Research & Creative Works

Recent studies have demonstrated that mobile elements (MEs) are an efficient solution to help decrease dramatically energy consumption in wireless sensor networks (WSNs). However, in most of cases, sensors use duty cycle schemes to save energy, and unless the ME mobility pattern is deterministic, each sensor node has to discover the presence of the ME in the nearby area before starting to exchange data with it. Therefore, in such wireless sensor networks with mobile elements (in short, WSN-MEs), the definition and analysis of a protocol for efficient ME discovery becomes of fundamental importance. In this paper, we propose an extensive …


Impact Of Location History Collection Schemes On Observed Human Mobility Features, Alicia Rodriguez-Carrion, Sajal K. Das, Celeste Campo, Carlos Garcia-Rubio Jan 2014

Impact Of Location History Collection Schemes On Observed Human Mobility Features, Alicia Rodriguez-Carrion, Sajal K. Das, Celeste Campo, Carlos Garcia-Rubio

Computer Science Faculty Research & Creative Works

Human mobility knowledge is key for urban planning or mobility model's design. Therefore, estimating reliable mobility parameters is crucial to lay an unbiased foundation. However, most works estimating such features rely on datasets made up of the history of mobile network cells where the user is located when she makes active use of the network, known as Call Data Records (CDRs), or every time their device connects to a new cell, without taking into account cell changes not caused by movement. Could we accurately characterize human mobility with such datasets? In this work we consider three approaches to collect network-based …


Exploring Optimization And Caching For Efficient Collection Operations, Venkata Krishna Suhas Nerella, Swetha Surapaneni, Sanjay K. Madria, Thomas Weigert Jan 2014

Exploring Optimization And Caching For Efficient Collection Operations, Venkata Krishna Suhas Nerella, Swetha Surapaneni, Sanjay K. Madria, Thomas Weigert

Computer Science Faculty Research & Creative Works

Many large programs operate on collection types. Extensive libraries are available in many programming languages, such as the C++ Standard Template Library, which make programming with collections convenient. Extending programming languages to provide collection queries as first-class constructs in the language would not only allow programmers to write queries explicitly in their programs but it would also allow compilers to leverage the wealth of experience available from the database domain to optimize such queries. This paper describes an approach to reduce the run time of programs involving explicit collection queries by performing run time query optimization that is effective for …


An Access Point To Device Association Technique For Optimized Data Transfer In Mobile Grids, Ansuman Banerjee, Himadri Sekhar Paul, Arijit Mukherjee, Pubali Datta, Sajal K. Das Jan 2014

An Access Point To Device Association Technique For Optimized Data Transfer In Mobile Grids, Ansuman Banerjee, Himadri Sekhar Paul, Arijit Mukherjee, Pubali Datta, Sajal K. Das

Computer Science Faculty Research & Creative Works

In a mobile grid computing framework where mobile devices are used as computing resources, minimizing the task offloading time remains an important issue. A task is an independent unit of execution consisting of a input data volume for execution and optionally a target-specific executable. We consider a mobile grid infrastructure where mobile devices are connected via Wi-Fi network and the grid infrastructure has a set of tasks (i.e. a set of data volumes) to be transferred to a subset of the mobile devices. In a Wi-Fi network, mobile devices usually associate themselves to the access points (APs) having the strongest …


Intelligent Management Systems For Energy Efficiency In Buildings: A Survey, Alessandra De Paola, Marco Ortolani, Giuseppe Lo Re, Giuseppe Anastasi, Sajal K. Das Jan 2014

Intelligent Management Systems For Energy Efficiency In Buildings: A Survey, Alessandra De Paola, Marco Ortolani, Giuseppe Lo Re, Giuseppe Anastasi, Sajal K. Das

Computer Science Faculty Research & Creative Works

In recent years, reduction of energy consumption in buildings has increasingly gained interest among researchers mainly due to practical reasons, such as economic advantages and long-term environmental sustainability. Many solutions have been proposed in the literature to address this important issue from complementary perspectives, which are often hard to capture in a comprehensive manner. This survey article aims at providing a structured and unifying treatment of the existing literature on intelligent energy management systems in buildings, with a distinct focus on available architectures and methodology supporting a vision transcending the well-established smart home vision, in favor of the novel Ambient …


Hybrid-Cascade Coupled-Line Phasers For High-Resolution Radio-Analog Signal Processing, Thomas Paradis, Shulabh Gupta, Qingfeng Zhang, Li (Lijun) J. Jiang, Christophe Caloz Jan 2014

Hybrid-Cascade Coupled-Line Phasers For High-Resolution Radio-Analog Signal Processing, Thomas Paradis, Shulabh Gupta, Qingfeng Zhang, Li (Lijun) J. Jiang, Christophe Caloz

Electrical and Computer Engineering Faculty Research & Creative Works

A hybrid-cascade (HC) coupled-line phaser configuration is presented to synthesize enhanced group delay responses for high-resolution radio-analog signal processing. Using exact analytical transfer functions, the superiority of HC coupled-line phasers over conventional transversally cascaded C-section phasers is demonstrated and verified using full-wave simulations. © 2014 Wiley Periodicals, Inc.


A New Efficient Method For Analysis Of Finite Periodic Structures, Xiaoyan Y.Z. Xiong, Ling Ling Meng, Li (Lijun) Jun Jiang, Wei E.I. Sha Jan 2014

A New Efficient Method For Analysis Of Finite Periodic Structures, Xiaoyan Y.Z. Xiong, Ling Ling Meng, Li (Lijun) Jun Jiang, Wei E.I. Sha

Electrical and Computer Engineering Faculty Research & Creative Works

The electromagnetic modeling of practical finite periodic structures is a topic of growing interest. Due to the truncation of the infinite periodic structures, surface waves will be excited and localized near the discontinuous interfaces leading to the edge effect of finite structures. In this work, surface waves are numerically disentangled from the propagating Bloch waves contributions. Based on the universally exponential decay feature of the surface waves, a novel method is developed by connecting the solution to the large finite periodic structure with that to a relatively small one resulting in low complexity and memory consumption. The method numerically reconstructs …


Data Pattern Based Electromagnetic Interference Modeling For Ic Packaging, Nick K.H. Huang, Tao Wang, Li (Lijun) Jun Jiang, X. Y. Xiong Jan 2014

Data Pattern Based Electromagnetic Interference Modeling For Ic Packaging, Nick K.H. Huang, Tao Wang, Li (Lijun) Jun Jiang, X. Y. Xiong

Electrical and Computer Engineering Faculty Research & Creative Works

Electromagnetic interference (EMI) is becoming more serious when the data rate of the digital system continues increasing. However, its modeling and analysis are very challenging. In this paper, a novel electromagnetic superposition method is developed to model the IC packaging electromagnetic emission. It employs the equivalence principle to obtain the electromagnetic field response over a broad spectrum. Then it uses the linear property of the passive parasitic system to superpose the contribution of different signals on the packaging. As a result, with certain pre-calculations, it is convenient to compute the electromagnetic emission efficiently from different signals with various data pattern …


Traveling-Wave Antennas With Exotic Radiation Patterns, S. Gupta, C. Caloz, L. (Lijun) J. Jiang Jan 2014

Traveling-Wave Antennas With Exotic Radiation Patterns, S. Gupta, C. Caloz, L. (Lijun) J. Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

Two type of planar leaky-wave antennas are presented which are capable of providing combined electric and magnetic-dipole radiation responses from a single electromagnetic structure, leading to exotic radiation pattern characteristics. Their principle and radiation characteristics are discussed in details.


Differential-Forms-Motivated Discretizations Of Electromagnetic Differential And Integral Equations, Qi I. Dai, Weng Cho Chew, Li (Lijun) Jun Jiang, Yumao Wu Jan 2014

Differential-Forms-Motivated Discretizations Of Electromagnetic Differential And Integral Equations, Qi I. Dai, Weng Cho Chew, Li (Lijun) Jun Jiang, Yumao Wu

Electrical and Computer Engineering Faculty Research & Creative Works

In this letter, we present a differential-forms-motivated procedure to unify and guide discretizations of differential and integral equations in computational electromagnetics (CEM). In order to solve such equations accurately, it is crucial to find an appropriate matrix representation of the governing differential or integral operator. Differential forms theory inspires a general procedure of selecting both expansion and test functions wisely. Many well-functioning discretizations in finite element method (FEM) and boundary element method (BEM) can be reinterpreted with this theory. Moreoever, our approach offers guidance for discretizing complicated problems where straightforward discretizations may not be available. © 2014 IEEE.


Overhead High-Voltage Transmission-Line Current Monitoring By Magnetoresistive Sensors And Current Source Reconstruction At Transmission Tower, X. Sun, Q. Huang, L. (Lijun) J. Jiang, P. W.T. Pong Jan 2014

Overhead High-Voltage Transmission-Line Current Monitoring By Magnetoresistive Sensors And Current Source Reconstruction At Transmission Tower, X. Sun, Q. Huang, L. (Lijun) J. Jiang, P. W.T. Pong

Electrical and Computer Engineering Faculty Research & Creative Works

This paper proposes a novel current monitoring technology based on magnetic field sensing at a transmission tower for overhead high-voltage transmission lines (HVTLs), which can accurately measure phase current parameters in real time. This technology is based on the phenomenon that the magnetic field distribution at the top level of a transmission tower can reflect the operation states of the transmission lines including current amplitude and phase angle imbalances. A current source reconstruction method based on stochastic optimization strategy was developed to reconstruct the electrical parameters from the magnetic field emanated by the overhead transmission lines. This concept of current …


Numerical Modeling Of Infrared Thermography Techniques Via Ansys, Hayder Abdulnabi Thajeel Dec 2013

Numerical Modeling Of Infrared Thermography Techniques Via Ansys, Hayder Abdulnabi Thajeel

Masters Theses

"Several inspection techniques have been developed over years. Recently, infrared thermography (IRT) technology has become a widely accepted as a nondestructive inspection (NDI) technique for different fields and various applications as well. Infrared thermography stands as one of the most an attractive and a successful NDI technique that has ability to detect the object's surface/subsurface defects remotely based on observing and measuring the surface's emitted infrared heat radiation by using an infrared camera. The finite element modeling FEM ANSYS was successfully used for the modelling of several IRT techniques; such as Pulsed Thermography (PT) and Lock-in Thermography (LT) that can …


Efficient And Long-Time Accurate Second-Order Methods For The Stokes-Darcy System, Wenbin Chen, Max Gunzburger, Dong Sun, Xiaoming Wan Dec 2013

Efficient And Long-Time Accurate Second-Order Methods For The Stokes-Darcy System, Wenbin Chen, Max Gunzburger, Dong Sun, Xiaoming Wan

Mathematics and Statistics Faculty Research & Creative Works

We propose and study two second order in time implicit-explicit methods for the coupled Stokes-Darcy system that governs flows in karst aquifers and other subsurface flow systems. the first method is a combination of a second-order backward differentiation formula and the second order Gear's extrapolation approach. the second is a combination of the second-order Adams-Moulton and second-order Adams-Bashforth methods. Both algorithms only require the solution of decoupled Stokes and Darcy problems at each time-step. Hence, these schemes are very efficient and can be easily implemented using legacy codes. We establish the unconditional and uniform in time stability for both schemes. …


3d Conductive Nanocomposite Scaffold For Bone Tissue Engineering, Aref Shahini, Mostafa Yazdimamaghani, Kenneth J. Walker, Margaret A. Eastman, Hamed Hatami-Marbini, Brenda J. Smith, John L. Ricci, Sundar V. Madihally, Daryoosh Vashaee, Lobat Tayebi Dec 2013

3d Conductive Nanocomposite Scaffold For Bone Tissue Engineering, Aref Shahini, Mostafa Yazdimamaghani, Kenneth J. Walker, Margaret A. Eastman, Hamed Hatami-Marbini, Brenda J. Smith, John L. Ricci, Sundar V. Madihally, Daryoosh Vashaee, Lobat Tayebi

Chemical and Biochemical Engineering Faculty Research & Creative Works

Bone healing can be significantly expedited by applying electrical stimuli in the injured region. Therefore, a three-dimensional (3D) ceramic conductive tissue engineering scaffold for large bone defects that can locally deliver the electrical stimuli is highly desired. In the present study, 3D conductive scaffolds were prepared by employing a biocompatible conductive polymer, ie, poly(3,4-ethylenedioxythiophene) poly (4-styrene sulfonate) (PEDOT:PSS), in the optimized nanocomposite of gelatin and bioactive glass. For in vitro analysis, adult human mesenchymal stem cells were seeded in the scaffolds. Material characterizations using hydrogen-1 nuclear magnetic resonance, in vitro degradation, as well as thermal and mechanical analysis showed that …


Effect Of Nanoparticles On The Biochemical And Behavioral Aging Phenotype Of The Nematode Caenorhabditis Elegans, Andrea Scharf, Annette Piechulek, Anna Von Mikecz Dec 2013

Effect Of Nanoparticles On The Biochemical And Behavioral Aging Phenotype Of The Nematode Caenorhabditis Elegans, Andrea Scharf, Annette Piechulek, Anna Von Mikecz

Biological Sciences Faculty Research & Creative Works

Invertebrate animal models such as the nematode Caenorhabditis elegans (C. elegans) are increasingly used in nanotechnological applications. Research in this area covers a wide range from remote control of worm behavior by nanoparticles (NPs) to evaluation of organismal nanomaterial safety. Despite of the broad spectrum of investigated NP-bio interactions, little is known about the role of nanomaterials with respect to aging processes in C. elegans. We trace NPs in single cells of adult C. elegans and correlate particle distribution with the worm's metabolism and organ function. By confocal microscopy analysis of fluorescently labeled NPs in living worms, we identify two …


C4a-Hydroperoxyflavin Formation In N -Hydroxylating Flavin Monooxygenases Is Mediated By The 2′-Oh Of The Nicotinamide Ribose Of Nadp⁺, Reeder Robinson, Somayesadat Badieyan, Pablo Sobrado Dec 2013

C4a-Hydroperoxyflavin Formation In N -Hydroxylating Flavin Monooxygenases Is Mediated By The 2′-Oh Of The Nicotinamide Ribose Of Nadp⁺, Reeder Robinson, Somayesadat Badieyan, Pablo Sobrado

Chemistry Faculty Research & Creative Works

Flavin-dependent monooxygenases must stabilize a C4a-hydroperoxyflavin intermediate to hydroxylate their respective substrates. Formation and decay of the C4a-hydroperoxyflavin were monitored under rapid reaction kinetic conditions in SidA, an N-hydroxylating monooxygenase involved in siderophore biosynthesis. Solvent kinetic isotope effect studies of flavin oxidation indicate that both hydrogen peroxide elimination and water elimination occur via abstraction of hydrogen from the N5 of the flavin. Kinetic isotope effect and density functional theory results are consistent with the transfer of a proton from the 2′-OH of the nicotinamide ribose of nicotinamide adenine dinucleotide phosphate (NADP+) to the C4a-peroxyflavin to form the C4a-hydroperoxyflavin. This represents …


Recent Development Of Surface Integral Equation Solvers For Multiscale Interconnects And Circuits, Sheng Sun, Lijun Jiang, Weng Cho Chew Dec 2013

Recent Development Of Surface Integral Equation Solvers For Multiscale Interconnects And Circuits, Sheng Sun, Lijun Jiang, Weng Cho Chew

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents a brief review and recent development of surface integral equation solvers for multiscale interconnects and circuits modeling. As the future production processes down to 5 nm and the operating frequency increases, both multi-scale and large-scale natures should be taken into account in the electromagnetic simulations. Fast, efficient, stable, and broadband integral equation based solvers become indispensable when millions or ten s of millions of unknowns might be involved in the simulation of the integrated circuit. Recent progress and our latest researches in the development of broadband fast electromagnetic solvers will be demonstrated. © 2013 IEEE.


Full-Quantum Simulation Of P-Type Junctionless Transistors With Multi-Band K · P Model, Jun Z. Huang, Weng Cho Chew, Li (Lijun) Jun Jiang, Jie Peng, Chi Yung Yam, Guan Hua Chen Dec 2013

Full-Quantum Simulation Of P-Type Junctionless Transistors With Multi-Band K · P Model, Jun Z. Huang, Weng Cho Chew, Li (Lijun) Jun Jiang, Jie Peng, Chi Yung Yam, Guan Hua Chen

Electrical and Computer Engineering Faculty Research & Creative Works

By adopting a model order reduction technique, we have successfully constructed a program for efficient simulation of nanowire transistors based on the multi-band k · p model and non-equilibrium Green's function (NEGF) approach. We then study for the first time the influences of various device parameters on the performances of p-type junctionless (JL) transistors and compare them to traditional inversion mode (IM) devices. © 2013 IEEE.


Agenda For The First Meeting Of The Forum For Promotion Of Soil Dynamics In India, Shamsher Prakash Dec 2013

Agenda For The First Meeting Of The Forum For Promotion Of Soil Dynamics In India, Shamsher Prakash

Forum for Promotion of Soil Dynamics in India

No abstract provided.


Natural Hazard Preparedness And Mitigation In India, T. N. Gupta Dec 2013

Natural Hazard Preparedness And Mitigation In India, T. N. Gupta

Forum for Promotion of Soil Dynamics in India

No abstract provided.


Computational Modeling In Geotechnical Eq. Eng., D. K. Paul Dec 2013

Computational Modeling In Geotechnical Eq. Eng., D. K. Paul

Forum for Promotion of Soil Dynamics in India

No abstract provided.


Vision 2014-19 Soil Dynamics In India, Amit Prashant Dec 2013

Vision 2014-19 Soil Dynamics In India, Amit Prashant

Forum for Promotion of Soil Dynamics in India

No abstract provided.


Technical Activities Of Dr. Gopal Ranjan Related To Soil Dynamics, Gopal Ranjan Dec 2013

Technical Activities Of Dr. Gopal Ranjan Related To Soil Dynamics, Gopal Ranjan

Forum for Promotion of Soil Dynamics in India

No abstract provided.


Forum For Promotion Of Soil Dynamics In India, Shamsher Prakash Dec 2013

Forum For Promotion Of Soil Dynamics In India, Shamsher Prakash

Forum for Promotion of Soil Dynamics in India

No abstract provided.


Future Path And Suggestions From Various Members, Deepankar Choudhury Dec 2013

Future Path And Suggestions From Various Members, Deepankar Choudhury

Forum for Promotion of Soil Dynamics in India

No abstract provided.


Short Courses 2014-16, Amit Prashant Dec 2013

Short Courses 2014-16, Amit Prashant

Forum for Promotion of Soil Dynamics in India

No abstract provided.


Forum For Promotion Of Soil Dynamics In India, Vijay K. Puri Dec 2013

Forum For Promotion Of Soil Dynamics In India, Vijay K. Puri

Forum for Promotion of Soil Dynamics in India

No abstract provided.


Research Cooperation Between Ngi And Iitr (Geotech Eq Eng. Aspects), B. K. Maheshwari Dec 2013

Research Cooperation Between Ngi And Iitr (Geotech Eq Eng. Aspects), B. K. Maheshwari

Forum for Promotion of Soil Dynamics in India

No abstract provided.