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Articles 11911 - 11940 of 33650
Full-Text Articles in Entire DC Network
An Experimental Study On Bond Strength Of Reinforcing Steel In High-Volume Fly-Ash Concrete, Trevor J. Looney, Mahdi Arezoumandi, Jeffery S. Volz, John J. Myers
An Experimental Study On Bond Strength Of Reinforcing Steel In High-Volume Fly-Ash Concrete, Trevor J. Looney, Mahdi Arezoumandi, Jeffery S. Volz, John J. Myers
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The production of Portland cement-the key ingredient in concrete-generates a significant amount of carbon dioxide. However, because of its incredible versatility, availability, and relatively low cost, concrete is the most consumed manmade material on the planet. One method of reducing concrete's contribution to greenhouse gas emissions is the use of fly ash to replace a significant amount of the cement. an experimental investigation was conducted to compare the bond strength of reinforcing steel in high-volume fly-ash concrete (HVFAC)-concrete with at least 50 % of the cement replaced with fly ash-with conventional concrete (CC). This study investigated two HVFAC mixes [with …
Ctod: Collaborative Tree-Based Outlier Detection In Wireless Sensor Networks, Dylan Mcdonald, Sanjay Kumar Madria, Fikret Ercal, Ryan Birmingham, Thomas Lake
Ctod: Collaborative Tree-Based Outlier Detection In Wireless Sensor Networks, Dylan Mcdonald, Sanjay Kumar Madria, Fikret Ercal, Ryan Birmingham, Thomas Lake
Computer Science Faculty Research & Creative Works
Outlier detection is a well-studied problem in various fields. the unique challenges of wireless sensor networks such as limited bandwidth, memory, energy, and unreliable communication make this problem especially difficult. Sensors can detect outliers for a plethora of reasons and these reasons need to be inferred in real time. Here, we present a new robust communication framework for the unsupervised in network detection of outliers in a wireless sensor network. First, communication is minimized through an ad-hoc collaborative communication scheme which controls sensor behavior to increase overall visibility of individual streaming data sets. Second, an outlier detection algorithm is tailored …
The Missouri Miner, December 3, 2012
The Missouri Miner, December 3, 2012
The Missouri Miner Newspaper
No abstract provided.
Oscillation Results For Fourth-Order Nonlinear Dynamic Equations, Chenghui Zhang, Tongxing Li, Ravi P. Agarwal, Martin Bohner
Oscillation Results For Fourth-Order Nonlinear Dynamic Equations, Chenghui Zhang, Tongxing Li, Ravi P. Agarwal, Martin Bohner
Mathematics and Statistics Faculty Research & Creative Works
This work is concerned with the oscillation of a certain class of fourth-order nonlinear dynamic equations on time scales. a new oscillation result and an example are included. © 2012 Elsevier Ltd. All rights reserved.
Jensen's Functionals On Time Scales, Matloob Anwar, Rabia Bibi, Martin Bohner, Josip Pečarić
Jensen's Functionals On Time Scales, Matloob Anwar, Rabia Bibi, Martin Bohner, Josip Pečarić
Mathematics and Statistics Faculty Research & Creative Works
We consider Jensen's functionals on time scales and discuss its properties and applications. Further, we define weighted generalized and power means on time scales. by applying the properties of Jensen's functionals on these means, we obtain several refinements and converses of Hölder's inequality on time scales. Copyright © 2012 Matloob Anwar et al.
Search-Based Detection Of High-Level Model Changes, Ameni Ben Fadhel, Marouane Kessentini, Philip Langer, Manuel Wimmer
Search-Based Detection Of High-Level Model Changes, Ameni Ben Fadhel, Marouane Kessentini, Philip Langer, Manuel Wimmer
Computer Science Faculty Research & Creative Works
Software models are iteratively refined, restructured and evolved. the detection and analysis of changes applied between two versions of a model are one of the most important tasks during evolution and maintenance activities. in this paper, we propose an approach to detect high-level model changes in terms of refactoring. Our approach takes as input an exhaustive list of possible refactoring, the initial model and revised model, and generates as output a list of detected changes representing a sequence of refactoring. a solution is defined as a combination of refactoring that should maximize as much as possible the similarity between the …
Query Plan Execution In A Heterogeneous Stream Management System For Situational Awareness, Indrakshi Ray, Sanjay K. Madria, Mark Linderman
Query Plan Execution In A Heterogeneous Stream Management System For Situational Awareness, Indrakshi Ray, Sanjay K. Madria, Mark Linderman
Computer Science Faculty Research & Creative Works
Battlefield monitoring involves collecting streaming data from different sources, transmitting the data over a heterogeneous network, and processing queries in real-time in order to respond to events in a timely manner. Nodes in these networks differ with respect to their processing, storage and communication capabilities. Links in the network differ with respect to their communication bandwidth. the topology of the network itself is subject to change, as the nodes and links may become unavailable. Continuous queries executed in such environments must also meet some quality of service (QoS) requirements, such as, response time, throughput, and memory usage. We propose that …
Automatic Social Group Organization And Privacy Management, Anna Squicciarini, Dan Lin, Sushama Karumanchi, Nicole Desisto
Automatic Social Group Organization And Privacy Management, Anna Squicciarini, Dan Lin, Sushama Karumanchi, Nicole Desisto
Computer Science Faculty Research & Creative Works
With the dramatic increase of users on social network websites, the needs to assist users to manage their large number of contacts as well as providing privacy protection become more and more evident. Unfortunately, limited tools are available to address such needs and reduce users' workload on managing their social relationships. to tackle this issue, we propose an approach to facilitate online social network users to group their contacts into social circles with common interests. Further, we leverage the social group practice to automate the privacy setting process for users who add new contacts or upload new data items. We …
Search-Based Refactoring: Towards Semantics Preservation, Ali Ouni, Marouane Kessentini, Houari Sahraoui, Mohamed Salah Hamdi
Search-Based Refactoring: Towards Semantics Preservation, Ali Ouni, Marouane Kessentini, Houari Sahraoui, Mohamed Salah Hamdi
Computer Science Faculty Research & Creative Works
Refactoring restructures a program to improve its structure without altering its behavior. However, it is challenging to preserve the domain semantics of a program when refactoring is decided/implemented automatically. Indeed, a program could be syntactically correct, have the right behavior, but model incorrectly the domain semantics. in this paper, we propose a multi-objective optimization approach to find the best sequence of refactorings that maximizes quality improvements (program structure) and minimizes semantic errors. to this end, we use the non-dominated sorting genetic algorithm (NSGA-II) to find the best compromise between these two conflicting objectives. We report the results of our experiments …
Fast Variable Selection For Memetracker Phrases Time Series Prediction, Yoan Miche, Tatiana Chistiakova, Anton Akusok, Amaury Lendasse, Rui Nian, Alberto Guilléhn
Fast Variable Selection For Memetracker Phrases Time Series Prediction, Yoan Miche, Tatiana Chistiakova, Anton Akusok, Amaury Lendasse, Rui Nian, Alberto Guilléhn
Engineering Management and Systems Engineering Faculty Research & Creative Works
This Paper Proposes a Methodology using a Fast Variable Selection as a Modified Version of the Forward-Backward Algorithm. This Methodology is Adapted to the Specificities of the Data Used: Very Small Number of Samples and High Number of Variables. Such Data is Generated using Underlying Dependencies and Seasonality Assumptions, from Meme Phrases Volume Data. by the Use of a Resampling Technique Along with the Proposed Variable Selection Scheme, Significant Results Are Obtained, and the Test Normalized Mean Square Error Performances Are Improved. the Results Indicate that with the Assumptions Made on the Data Structure, Variable Selection is Desirable. Also, the …
Three Point Encryption (3pe): Secure Communications In Delay Tolerant Networks, Roy Cabaniss, Vimal Kumar, Sanjay Madria
Three Point Encryption (3pe): Secure Communications In Delay Tolerant Networks, Roy Cabaniss, Vimal Kumar, Sanjay Madria
Computer Science Faculty Research & Creative Works
Mobile ad hoc networks (MANET) are a subset of Delay Tolerant Networks (DTNs) composed of several mobile devices. These dynamic environments make conventional security algorithms unreliable, nodes that are far apart may not have access to the other's public key, making secure message exchange difficult. Other security methods rely on requesting the key from a trusted third party, which can be unavailable in DTN. the purpose of this paper is to introduce two message security algorithms capable of delivering messages securely against either eavesdropping or manipulation. the first algorithm, Chaining, uses multiple midpoints to re-encrypt the message for the destination …
Laser-Induced Electron Diffraction For Probing Rare Gas Atoms, Junliang Xu, Cosmin I. Blaga, Anthony D. Dichiara, Emily Sistrunk, Kaikai Zhang, Zhangjin Chen, Anh-Thu Le, Toru Morishita, C. D. Lin, Pierre Agostini, Louis F. Dimauro
Laser-Induced Electron Diffraction For Probing Rare Gas Atoms, Junliang Xu, Cosmin I. Blaga, Anthony D. Dichiara, Emily Sistrunk, Kaikai Zhang, Zhangjin Chen, Anh-Thu Le, Toru Morishita, C. D. Lin, Pierre Agostini, Louis F. Dimauro
Physics Faculty Research & Creative Works
Recently, using midinfrared laser-induced electron diffraction (LIED), snapshots of a vibrating diatomic molecule on a femtosecond time scale have been captured [C.I. Blaga et al., Nature (London) 483, 194 (2012)]. In this Letter, a comprehensive treatment for the atomic LIED response is reported, a critical step in generalizing this imaging method. Electron-ion differential cross sections (DCSs) of rare gas atoms are extracted from measured angular-resolved, high-energy electron momentum distributions generated by intense midinfrared lasers. Following strong-field ionization, the high-energy electrons result from elastic rescattering of a field-driven wave packet with the parent ion. For recollision energies [greater or equal] 100eV, …
Modeling System Of Systems Acquisition, Nil Kilicay-Ergin, Paulette Acheson, John Colombi, Cihan H. Dagli
Modeling System Of Systems Acquisition, Nil Kilicay-Ergin, Paulette Acheson, John Colombi, Cihan H. Dagli
Engineering Management and Systems Engineering Faculty Research & Creative Works
System of systems (SoS) acquisition is a dynamic process of integrating independent systems. This paper describes modeling of the SoS acquisition environment based on the Wave Process Model. Agent-Based modeling methodology is utilized to abstract behavioral aspects of the acquisition process. © 2012 IEEE.
Electric Field-Induced Tetragonal To Orthorhombic Phase Transitions In [110]C-Oriented Batio₃ Single Crystals, D. J. Franzbach, Yijia Gu, Long-Qing Chen, K. G. Webber
Electric Field-Induced Tetragonal To Orthorhombic Phase Transitions In [110]C-Oriented Batio₃ Single Crystals, D. J. Franzbach, Yijia Gu, Long-Qing Chen, K. G. Webber
Materials Science and Engineering Faculty Research & Creative Works
Electric field-induced phase transitions in [110]c-oriented BaTiO3 single crystals were studied by macroscopic electrical measurements in the temperature range from 20 °C to 50 °C. Discontinuous, hysteretic jumps in the polarization and strain were observed, indicating a tetragonal ↔ orthorhombic phase transition. The critical electric field to induce the transition was found to shift to higher values with increasing temperature. The Landau-Devonshire theory was used to analyze the observed electric field-induced T ↔ O phase transitions.
Acoustic Scale From The Angular Power Spectra Of Sdss-Iii Dr8 Photometric Luminous Galaxies, Hee-Jong Seo, Shirley Ho, Martin White, Antonio J. Cuesta, Ashley J. Ross, Shun Saito, For Full List Of Authors, See Publisher's Website.
Acoustic Scale From The Angular Power Spectra Of Sdss-Iii Dr8 Photometric Luminous Galaxies, Hee-Jong Seo, Shirley Ho, Martin White, Antonio J. Cuesta, Ashley J. Ross, Shun Saito, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We measure the acoustic scale from the angular power spectra of the Sloan Digital Sky Survey III (SDSS-III) Data Release 8 imaging catalog that includes 872, 921 galaxies over ~10,000 deg2 between 0.45 < z < 0.65. The extensive spectroscopic training set of the Baryon Oscillation Spectroscopic Survey luminous galaxies allows precise estimates of the true redshift distributions of galaxies in our imaging catalog. Utilizing the redshift distribution information, we build templates and fit to the power spectra of the data, which are measured in our companion paper, to derive the location of Baryon acoustic oscillations (BAOs) while marginalizing over many free parameters to exclude nearly all of the non-BAO signal. We derive the ratio of the angular diameter distance to the sound horizon scale DA(z)/rs = 9.212+0.416-0.404 at z = 0.54, and therefore DA (z) = 1411 ± 65 Mpc at z = 0.54; the result is fairly independent of assumptions on the underlying cosmology. Our measurement of angular diameter distance DA(z) is 1.4σ higher than what is expected for the concordance ΛCDM, in accordance to the trend of other spectroscopic BAO measurements for …
Tdma For Wireless Passive Backscatter Networks: An Information Theoretic Approach, Aditya V. Padaki, Maciej Zawodniok
Tdma For Wireless Passive Backscatter Networks: An Information Theoretic Approach, Aditya V. Padaki, Maciej Zawodniok
Electrical and Computer Engineering Faculty Research & Creative Works
The passive backscatter technology is increasingly employed in wireless sensor network (WSN) applications. in contrast to existing technologies, it offers several advantages including a battery-less operation, extremely small-form factor, and low costs. Our previous works demonstrated that theoretically such backscatter-Based network outperforms existing solutions. in contrast, this paper presents a new time division multiple access (TDMA) based approach that considers a practical realization of the multi-hop framework. the capacity limits for the proposed scheme are evaluated for two frameworks - (a) single hop with direct backscatter signal and (b) a multi-hop transmission. an analytical comparison shows that the multi-hop transmission …
Securing A Wireless Networked Control System Using Information Fusion, Brijesh Kashyap Chejerla, Sanjay Madria
Securing A Wireless Networked Control System Using Information Fusion, Brijesh Kashyap Chejerla, Sanjay Madria
Computer Science Faculty Research & Creative Works
Security of a wireless sensor network practically governs its usability in several applications. Especially, in applications like Industrial control systems which use NCS and SCADA systems, the security affects the stability of the system. We propose to use an information fusion scheme which allows us to profile the different attacks in wireless sensor networks and study their effects on the control systems stability and feedback. We make use of the Bayesian Networks to obtain hypotheses as outputs which form the decisions. These decisions are made based on the feature extraction and estimation process of the entire information fusion scheme. This …
Gas Adsorption In Novel Environments, Including Effects Of Pore Relaxation, W. Milton Cole, Silvina M. Gatica, Hye Young Kim, Angela D. Lueking, Sarmishtha Sircar
Gas Adsorption In Novel Environments, Including Effects Of Pore Relaxation, W. Milton Cole, Silvina M. Gatica, Hye Young Kim, Angela D. Lueking, Sarmishtha Sircar
Chemical and Biochemical Engineering Faculty Research & Creative Works
Adsorption experiments have been interpreted frequently with simplified model geometries, such as ideally flat surfaces and slit or cylindrical pores. Recent explorations of unusual environments, such as fullerenes and metal-organic-framework materials, have led to a broadened scope of experimental, theoretical and simulation investigations. This paper reviews a number of such studies undertaken by our group. Among the topics receiving emphasis are these: universality of gas uptake in pores, relaxation of a porous absorbent due to gas uptake and the novel phases of gases on a single nanotube, all of which studies have been motivated by recent experiments.
A Mechanistic Model Of Early Fcεri Signaling: Lipid Rafts And The Question Of Protection From Dephosphorylation, Dipak Barua, Byron Goldstein
A Mechanistic Model Of Early Fcεri Signaling: Lipid Rafts And The Question Of Protection From Dephosphorylation, Dipak Barua, Byron Goldstein
Chemical and Biochemical Engineering Faculty Research & Creative Works
We present a model of the early events in mast cell signaling mediated by FcεRI where the plasma membrane is composed of many small ordered lipid domains (rafts), surrounded by a non-order region of lipids consisting of the remaining plasma membrane. The model treats the rafts as transient structures that constantly form and breakup, but that maintain a fixed average number per cell. The rafts have a high propensity for harboring Lyn kinase, aggregated, but not unaggregated receptors, and the linker for the activation of T cells (LAT). Phosphatase activity in the rafts is substantially reduced compared to the nonraft …
Numerical Simulation Of Particle-Driven Gravity Currents, Sangdo An, Pierre Y. Julien, Subhas K. Venayagamoorthy
Numerical Simulation Of Particle-Driven Gravity Currents, Sangdo An, Pierre Y. Julien, Subhas K. Venayagamoorthy
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Particle-driven gravity currents frequently occur in nature, for instance as turbidity currents in reservoirs. They are produced by the buoyant forces between fluids of different density and can introduce sediments and pollutants into water bodies. In this study, the propagation dynamics of gravity currents is investigated using the FLOW-3D computational fluid dynamics code. The performance of the numerical model using two different turbulence closure schemes namely the renormalization group (RNG) k-ε scheme in a Reynold-averaged Navier-Stokes framework (RANS) and the large-eddy simulation (LES) technique using the Smagorinsky scheme, were compared with laboratory experiments. The numerical simulations focus on two different …
Influencing Factors On The Dynamic Properties Of Organobentonites, Bate Bate, Susan Burns
Influencing Factors On The Dynamic Properties Of Organobentonites, Bate Bate, Susan Burns
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The dynamic responses of soils are important engineering properties, especially for soils with high organic contents, because these soils can underlie critical support structures such as highway bridges or levees. Consequently, the initial tangent shear modulus (Gmax), secant shear modulus ratio (G/Gmax), and damping ratio (D) are important parameters in evaluating the dynamic soil behavior for soils subjected to earthquake, wind, waves, traffic, and equipment vibration. in this study, these dynamic properties of organ bentonites were quantified experimentally using resonant column tests. the results from this study were evaluated in terms of the effect of shear strain, organic content, and …
Effect Of Scc Mixture Composition On Thixotropy And Formwork Pressure, A. F. Omran, Kamal H. Khayat, Y. M. Elaguab
Effect Of Scc Mixture Composition On Thixotropy And Formwork Pressure, A. F. Omran, Kamal H. Khayat, Y. M. Elaguab
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
High lateral pressure exerted on formwork systems by self-consolidating concrete (SCC) is one of the hindrances for using such highly flowable concrete in cast-in-place applications. Self-consolidating concrete is a complex system that can be made using a wide range of mixture proportioning and often incorporated various chemical admixtures and supplementary cementitious materials. the investigation of the effect of each material ingredient independently on lateral pressure of SCC is not a simple task. in this study, thixotropy is rather used to assess the effect of various mixture parameters on formwork pressure. Thixotropy is determined by the evaluation of the structural buildup …
Accurate And Efficient Computation Of Power Plane Pair Inductance, Liang Li, Albert E. Ruehli, Jun Fan
Accurate And Efficient Computation Of Power Plane Pair Inductance, Liang Li, Albert E. Ruehli, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
The computation of the power-plane inductance for multiple ports is an important part of the PDN design. in this paper, we present an efficient approach for the inductance computation. Since this PEEC approach is based on partial inductance computations, vias and other discontinuities can accurately be taken into account. Speed-up techniques are employed like the faster decay of the coupling due to the symmetry, sparsification and simplification of the partial mutual inductance evaluation. Also, an approximate rectangular mesh reduction method is introduced which allows a local increase in mesh density. © 2012 IEEE.
A Low Complexity Algorithm For Linear Precoder Design With Finite Alphabet Inputs, Mingxi Wang, Yahong Rosa Zheng, Chengshan Xiao, Weiliang Zeng
A Low Complexity Algorithm For Linear Precoder Design With Finite Alphabet Inputs, Mingxi Wang, Yahong Rosa Zheng, Chengshan Xiao, Weiliang Zeng
Electrical and Computer Engineering Faculty Research & Creative Works
A low complexity precoding method is proposed for practical multiple-input multiple-output (MIMO) systems. based on the two-step optimal precoder design algorithm that maximizes the lower bound of the mutual information with finite-alphabet inputs, the proposed method simplifies the precoder design by fixing the right singular vectors of the precoder matrix to be the modulation diversity matrix, eliminating the iterative optimization between the two steps, and discretizing the search space of the power allocation vector. the modulation diversity matrices are designed for different modulations, which outperform the existing maximum diversity for BPSK and 8PSK inputs. for a 4x4 channel, the computational …
Linear Mimo Precoding In Multi-Antenna Wiretap Channels For Finite-Alphabet Data, Yongpeng Wu, Chengshan Xiao, Zhi Ding, Xiqi Gao, Shi Jin
Linear Mimo Precoding In Multi-Antenna Wiretap Channels For Finite-Alphabet Data, Yongpeng Wu, Chengshan Xiao, Zhi Ding, Xiqi Gao, Shi Jin
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, we investigate the secrecy rate of finite alphabet communications over multiple-input, multiple-output, multiple-antenna eavesdropper (MIMOME) systems. Traditional precoder designs at the transmitter for achieving secrecy capacity (maximum secrecy rate) for MIMOME systems are developed according to the assumption of Gaussian input signals. Such designs may risk substantial secrecy rate loss when Gaussian inputs are replaced by practical finite alphabet inputs. to address this issue, we propose a linear precoding design to directly maximize the secrecy rate for MIMOME systems under the constraint of finite alphabet input. Exploiting convex optimization and matrix calculus, we present necessary conditions required …
Linear Precoding Of Finite Alphabet Signals In Multi-Antenna Broadcast Channels, Yongpeng Wu, Mingxi Wang, Chengshan Xiao, Zhi Ding, Xiqi Gao
Linear Precoding Of Finite Alphabet Signals In Multi-Antenna Broadcast Channels, Yongpeng Wu, Mingxi Wang, Chengshan Xiao, Zhi Ding, Xiqi Gao
Electrical and Computer Engineering Faculty Research & Creative Works
We investigate the design of linear transmit precoding for multiple-input multiple-output (MIMO) broadcast channels (BC) with finite alphabet input signals. We derive an explicit expression for the achievable rate region of the MIMO BC with discrete constellation inputs, which is generally applicable to cases involving arbitrary user number and arbitrary antenna configurations. for the case where all the users employ the same modulation scheme, we further present a weighted sum rate upper-bound of the MIMO BC with identical transmit precoding matrices. the resulting bound demonstrates a serious performance loss due to multi-user interference for MIMO BC with finite alphabet inputs …
On The Diversity Gain Region Of The Z-Interference Channels, Mohamed S. Nafea, Karim G. Seddik, Mohammed Nafie, Hesham El Gamal
On The Diversity Gain Region Of The Z-Interference Channels, Mohamed S. Nafea, Karim G. Seddik, Mohammed Nafie, Hesham El Gamal
Electrical and Computer Engineering Faculty Research & Creative Works
In this work, we analyze the diversity gain region (DGR) of the single-antenna Rayleigh fading Z-Interference channel (ZIC). More specifically, we characterize the achievable DGR of the fixed-power split Han-Kobayashi (HK) approach under these assumptions. Our characterization comes in a closed form and demonstrates that the HK scheme with only a common message is a singular case, which achieves the best DGR among all HK schemes for certain multiplexing gains. Finally, we show that generalized time sharing, with variable rate and power assignments for the common and private messages, does not improve the achievable DGR. © 2012 IEEE.
Features For Automated Tongue Image Shape Classification, Tayo Obafemi-Ajayi, Ratchadaporn Kanawong, Dong Xu, Shao Li, Ye Duan
Features For Automated Tongue Image Shape Classification, Tayo Obafemi-Ajayi, Ratchadaporn Kanawong, Dong Xu, Shao Li, Ye Duan
Electrical and Computer Engineering Faculty Research & Creative Works
Inspection of the tongue is a key component in Traditional Chinese Medicine. Chinese medical practitioners diagnose the health status of a patient based on observation of the color, shape, and texture characteristics of the tongue. The condition of the tongue can objectively reflect the presence of certain diseases and aid in the differentiation of syndromes, prognosis of disease and establishment of treatment methods. Tongue shape is a very important feature in tongue diagnosis. A different tongue shape other than ellipse could indicate presence of certain pathologies. In this paper, we propose a novel set of features, based on shape geometry …
Wide Area Monitoring Of Rotor Angle Based On Synchrophasor Measurements, P. K. Olulope, Ganesh K. Venayagamoorthy, K. A. Folly
Wide Area Monitoring Of Rotor Angle Based On Synchrophasor Measurements, P. K. Olulope, Ganesh K. Venayagamoorthy, K. A. Folly
Electrical and Computer Engineering Faculty Research & Creative Works
The concept of phasor is designed for steady state and phasor measurement unit (PMU) is based on this concept. Measuring rotor angle therefore during transient has become a challenging task. This paper investigates the possibility of using data from PMU to estimate the internal variables of synchronous generator such as rotor angle of large power system during transient disturbance. the rotor angle is estimated from synchro phasor such as phasor voltage and current as well as their angles. the proposed method is implemented on IEEE 68 bus system. © 2012 IEEE.
Efficiency Optimization Of A Sensorless V/F Control Method For Pmsm, Seyed Hesam Jafari, Keith Corzine, Jing Huang
Efficiency Optimization Of A Sensorless V/F Control Method For Pmsm, Seyed Hesam Jafari, Keith Corzine, Jing Huang
Electrical and Computer Engineering Faculty Research & Creative Works
This paper presents a V/f control for permanent magnet synchronous machines which focuses on optimization by minimizing the d-axis current in order to reduce the motor losses and supplied input power. the proposed sensor less method only needs machine terminal signals and does not require any additional motor parameter measurements. Minimization of the d-axis current is accomplished through computed reactive power. © 2012 IEEE.