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- Electrical and Computer Engineering Faculty Research & Creative Works (141)
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Articles 31 - 60 of 152
Full-Text Articles in Engineering
Comparison Of Near-Field Millimeter-Wave Probes For Detecting Corrosion Precursor Pitting Under Paint, Mohammad Tayeb Ahmad Ghasr, Sergey Kharkovsky, R. Zoughi, Russell A. Austin
Comparison Of Near-Field Millimeter-Wave Probes For Detecting Corrosion Precursor Pitting Under Paint, Mohammad Tayeb Ahmad Ghasr, Sergey Kharkovsky, R. Zoughi, Russell A. Austin
Electrical and Computer Engineering Faculty Research & Creative Works
Aircraft structural components such as wings and fuselages are constantly exposed to harsh environments, which make them susceptible to corrosion initiation and growth. To complicate matters, corrosion is normally hidden under paint and primer and cannot be visually detected until significant corrosion has occurred, causing the paint to blister. Corrosion of this type is usually preceded by the presence of corrosion precursor pitting. Hence, early detection of pitting is a critical issue in the maintenance of an aircraft and its structural components. Near-field microwave nondestructive testing techniques have been successfully used for detection of corrosion under paint, including very small …
Determination Of High Frequency Package Currents From Near-Field Scan Data, Xiaopeng Dong, Shaowei Deng, Daryl G. Beetner, Todd H. Hubing, Thomas Van Doren
Determination Of High Frequency Package Currents From Near-Field Scan Data, Xiaopeng Dong, Shaowei Deng, Daryl G. Beetner, Todd H. Hubing, Thomas Van Doren
Electrical and Computer Engineering Faculty Research & Creative Works
Integrated circuits (ICs) are often a significant source of radiated energy from electronic systems. Near-field magnetic scanning is an effective tool for measuring the current distribution in IC packages and investigating chiplevel EMI problems. This paper discusses analysis of near-magnetic field scan data using tangential and normal field measurements. Results show that combining near-field scan results from probes with multiple orientations is an effective way to identify the current paths in IC packages.
Estimation Of Current From Near-Field Measurement, Haixiao Weng, Daryl G. Beetner, Richard E. Dubroff, Jin Shi
Estimation Of Current From Near-Field Measurement, Haixiao Weng, Daryl G. Beetner, Richard E. Dubroff, Jin Shi
Electrical and Computer Engineering Faculty Research & Creative Works
Knowledge of high-frequency currents in the chip and chip-package are necessary for EMI analysis and prediction, though measurement of these currents may be difficult to obtain in many cases. One possibility is to estimate currents from near-field scan data. In this paper, measurements were made of the magnetic field over a simple circuit and a chip package. The current flowing in the circuit and the chip lead frame was estimated from the compensated near-field data and compared with measurements made directly on the pins. Estimation was performed both with and without structural information of the lead frame. The susceptibility of …
Neural Network Detection And Identification Of Electronic Devices Based On Their Unintended Emissions, Haixiao Weng, Xiaopeng Dong, Xiao Hu, Daryl G. Beetner, Todd H. Hubing, Donald C. Wunsch
Neural Network Detection And Identification Of Electronic Devices Based On Their Unintended Emissions, Haixiao Weng, Xiaopeng Dong, Xiao Hu, Daryl G. Beetner, Todd H. Hubing, Donald C. Wunsch
Electrical and Computer Engineering Faculty Research & Creative Works
Electromagnetic emissions were measured from several radio receivers to demonstrate the possibility of detecting and identifying these devices based on their unintended emissions. Radiated fields from the different radio receivers have unique characteristics that can be used to identify these devices by analyzing time-frequency plots of measured radiation. A neural network was also developed for automated device detection.
Emc Investigations In Switch Mode Power Supply, Ashwin Shashindranath
Emc Investigations In Switch Mode Power Supply, Ashwin Shashindranath
Opportunities for Undergraduate Research Experience Program (OURE)
An experimental investigation on the radiated emissions caused by a high current switched mode power supply (SMPS) that supplies a CPU was performed. The emissions testing revealed data that could be used to predict causes of electromagnetic radiation from inside the computer. The noise sources identified included clocks on the motherboard, which was excluded for the purposes of this study. Testing concentrated on the SMPS and some theoretical ideas are proposed for better construction of the power supply.
Power Transmission Control Using Distributed Max-Flow, Bruce M. Mcmillin, Austin Armbruster, Mariesa Crow, Michael R. Gosnell
Power Transmission Control Using Distributed Max-Flow, Bruce M. Mcmillin, Austin Armbruster, Mariesa Crow, Michael R. Gosnell
Computer Science Faculty Research & Creative Works
Existing maximum flow algorithms use one processor for all calculations or one processor per vertex in a graph to calculate the maximum possible flow through a graph's vertices. This is not suitable for practical implementation. We extend the max-flow work of Goldberg and Tarjan to a distributed algorithm to calculate maximum flow where the number of processors is less than the number of vertices in a graph. Our algorithm is applied to maximizing electrical flow within a power network where the power grid is modeled as a graph. Error detection measures are included to detect problems in a simulated power …
Locally Synchronous, Globally Asynchronous Design For Quantum-Dot Cellular Automata (Lsga Qca), Minsu Choi, Nohpill Park
Locally Synchronous, Globally Asynchronous Design For Quantum-Dot Cellular Automata (Lsga Qca), Minsu Choi, Nohpill Park
Electrical and Computer Engineering Faculty Research & Creative Works
The concept of clocking for QCA, referred to as the four-phase clocking, is widely used. However, inherited characteristics of QCA, such as the way to hold state, the way to synchronize data flows, and the way to power QCA cells, make the design of QCA circuits quite different from VLSI and introduce a variety of new design challenges and the most severe challenges are due to the fact that the overall timing of a QCA circuit is mainly dependent upon its layout. This fact is commonly referred to as the "layout-timing" problem. To circumvent the problem, a novel self-timed circuit …
Microwave And Millimeter Wave Testing For The Inspection Of The Space Shuttle Spray On Foam Insulation (Sofi) And The Acreage Heat Tiles, R. Zoughi, Sergey Kharkovsky, Frank L. Hepburn
Microwave And Millimeter Wave Testing For The Inspection Of The Space Shuttle Spray On Foam Insulation (Sofi) And The Acreage Heat Tiles, R. Zoughi, Sergey Kharkovsky, Frank L. Hepburn
Electrical and Computer Engineering Faculty Research & Creative Works
The utility of microwave and millimeter wave nondestructive testing and evaluation (NDT&E) methods, for testing the Space Shuttle's external fuel tank spray on foam insulation (SOFI) and the acreage heat tiles has been investigated during the past two years. Millimeter wave NDE techniques are capable of producing internal images of SOFI. This paper presents the results of testing several diverse panels with embedded voids and debonds at millimeter wave frequencies. Additionally, the results of testing a set of heat tiles are also presented. Finally, the attributes of these methods as well as the advantageous features associated with these systems are …
Pulse Regulation Control Technique For Flyback Converter, Mehdi Ferdowsi, Ali Emadi, Mark Telefus, Curtis Davis
Pulse Regulation Control Technique For Flyback Converter, Mehdi Ferdowsi, Ali Emadi, Mark Telefus, Curtis Davis
Electrical and Computer Engineering Faculty Research & Creative Works
Pulse regulation, a fixed frequency control technique, is introduced and applied to flyback converter operating in discontinuous conduction mode (DCM). The control parameters are designed in a way that the converter operates as close as possible to the critical conduction mode. In contrast to the conventional pulsewidth modulation control scheme, the principal idea of pulse regulation is to achieve output voltage regulation using high and low-power pulses. Pulse regulation is simple, cost effective, and enjoys a fast dynamic response. The proposed technique is applicable to any converter operating in DCM. However, this work mainly focuses on flyback topology. In this …
Multilevel Multi-Phase Propulsion Drives, Shuai Lu, Keith Corzine
Multilevel Multi-Phase Propulsion Drives, Shuai Lu, Keith Corzine
Electrical and Computer Engineering Faculty Research & Creative Works
This paper presents a comprehensive analysis of the 5-phase induction motor driven by voltage-source inverter drives and particularly its steady-state performance evaluation. The performance of various modulation methods are analyzed with insightful look into their harmonic content and torque ripple. Three separate methods are proposed to reduce the torque ripple for low, middle and high modulation index regions while eliminating or controlling the non-torque-producing harmonics within the current machine rating. A complete set of simulations are carried out to verify the concepts and proposed methods. The multi-level multiphase topology is introduced and it is compared to the two-level system. The …
Comparison Of Hybrid Propulsion Drive Schemes, Keith Corzine, Shuai Lu
Comparison Of Hybrid Propulsion Drive Schemes, Keith Corzine, Shuai Lu
Electrical and Computer Engineering Faculty Research & Creative Works
This paper provides a brief overview of a hybrid drives which have become popular in recent years. These drives combine two or more multilevel power inverters to obtain exceptional power quality which is necessary for Naval propulsion applications. Furthermore, for ship propulsion, where it may be difficult to obtain several isolated dc voltage sources, the inverter control can be set so that only one real dc power source is needed (or one per phase in the case of a series H-bridge type). Three types of hybrid drives considered and their advantages and limitations are described. Commonalities of the control of …
Efficiently Managing Security Concerns In Component Based System Design, Ammar Masood, Sahra Sedigh, Arif Ghafoor
Efficiently Managing Security Concerns In Component Based System Design, Ammar Masood, Sahra Sedigh, Arif Ghafoor
Electrical and Computer Engineering Faculty Research & Creative Works
Component-based software development (CBSD) offers many advantages like reduced product time to market, reduced complexity and cost etc. Despite these advantages its wide scale utilization in developing security critical systems is currently hampered because of lack, of suitable design techniques to efficiently manage the complete system security concerns in the development process. The use of commercial of the shelf (COTS) components can introduce various security and reliability risks in the system. In this paper we propose a methodology for efficient management of all the system security concerns involved in the design of component based systems. Our methodology is based on …
Facts/Ess Allocation Research For Damping Bulk Power System Low Frequency Oscillation, Li Zhang, Fei Wang, Yilu Liu, Michael R. Ingram, Steve Eckroad, Mariesa Crow
Facts/Ess Allocation Research For Damping Bulk Power System Low Frequency Oscillation, Li Zhang, Fei Wang, Yilu Liu, Michael R. Ingram, Steve Eckroad, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
No abstract provided.
Coordination Of Ufls And Ufgc By Application Of D-Smes, Li Zhang, Yilu Liu, Mariesa Crow
Coordination Of Ufls And Ufgc By Application Of D-Smes, Li Zhang, Yilu Liu, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, the authors studied the coordination of under frequency load shedding (UFLS) and under frequency governor control (UFGC) by applying the distributed superconducting magnetic energy storage (D-SMES) devices. The active power of D-SMES device is controlled to eliminate the initial rapid frequency drop and allow time for the full action of UFGC to take over. The reactive power of D-SMES is controlled to stabilise the local bus voltage. The research results show that D-SMES devices can damp the quick dropping of system frequency and hold it waiting for the full activation of system spinning reserve. D-SMES can help …
A Solution For Eaf Induced Problems In Bulk Power Systems By Fact/Ess, Li Zhang, Yilu Liu, Mark Baldwin, Michael R. Ingram, Dale T. Bradshaw, Steve Eckroad, Mariesa Crow
A Solution For Eaf Induced Problems In Bulk Power Systems By Fact/Ess, Li Zhang, Yilu Liu, Mark Baldwin, Michael R. Ingram, Dale T. Bradshaw, Steve Eckroad, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
No abstract provided.
Teaching Nanotechnology By Introducing Crossbar-Based Architecture And Quantum-Dot Cellular Automata, Minsu Choi, Nohpill Park
Teaching Nanotechnology By Introducing Crossbar-Based Architecture And Quantum-Dot Cellular Automata, Minsu Choi, Nohpill Park
Electrical and Computer Engineering Faculty Research & Creative Works
The end of photolithography as the driver for Moore's law is predicted within seven to twelve years and six different emerging technologies (mostly nanoscale) are expected to replace the current CMOS-based system integration paradigm. As nanotechnology is emerging, (1) there is a strong need for well-educated nanoscale systems engineers by industry, and (2) research and education efforts are also called to overcome numerous nanoscale systems issues. This paper is to propose a way to teach nanotechnology by introducing two emerging technologies: crossbar-based nanoarchitecture and quantum-dot cellular automata.
Control Technique For Series Input-Parallel Output Converter Topologies, Jonathan W. Kimball, Joseph T. Mossoba, Philip T. Krein
Control Technique For Series Input-Parallel Output Converter Topologies, Jonathan W. Kimball, Joseph T. Mossoba, Philip T. Krein
Electrical and Computer Engineering Faculty Research & Creative Works
A series input-parallel output DC-DC converter topology inherently provides output current sharing among the phases, provided the input voltages are forced to share. With conventional output voltage feedback controls, input voltage sharing is unstable. Recent literature work proposes complicated feedback loops to provide stable voltage sharing, at the expense of dynamic performance. In the current work, a simple controller based on the sensorless current mode approach (SCM) stabilizes voltage sharing without compromising system performance. The SCM controllers reject source disturbances, and allow the output voltage to be tightly regulated by additional feedback control. With SCM control in place, a #super-matched# …
Power Engineering Laboratory Facilities At The University Of Missouri--Rolla, Keith Corzine, Mariesa Crow
Power Engineering Laboratory Facilities At The University Of Missouri--Rolla, Keith Corzine, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
One of the significant niche areas at UMR is the area of electric power. For this reason UMR has invested in its power program over the years. The extent of this program ranges from power systems, motor drives, high-frequency effects in electric machines, acoustic noise of electric machines, FACTS device for electric utility applications, and naval propulsion power systems. The various laboratory facilities at UMR which supports these activities have been described in detail in this paper.
Modeling Controlled Switches And Diodes For Electro-Thermal Simulation, Jonathan W. Kimball
Modeling Controlled Switches And Diodes For Electro-Thermal Simulation, Jonathan W. Kimball
Electrical and Computer Engineering Faculty Research & Creative Works
Designers of advanced power converters may choose from a variety of switching device models for simulation. Some situations call for simple idealized models, while others require physics-based models. When evaluating thermal system performance, a behavioral model that includes both conduction and switching losses is desired. A set of models has been developed to include both unidirectional devices, such as IGBTs, BJTs, and diodes, and bidirectional devices, such as MOSFETs. Logic and timing elements are used to insert voltage and current sources into the circuit at appropriate times. All losses affect circuit operation, so simulation can accurately predict losses when the …
Environmental-Based Characterization Of Soc-Based Instrumentation Systems For Stratified Testing, N. J. Park, Koshy M. George, Nohpill Park, Minsu Choi, Yong-Bin Kim, Fabrizio Lombardi
Environmental-Based Characterization Of Soc-Based Instrumentation Systems For Stratified Testing, N. J. Park, Koshy M. George, Nohpill Park, Minsu Choi, Yong-Bin Kim, Fabrizio Lombardi
Electrical and Computer Engineering Faculty Research & Creative Works
This paper proposes a novel environmental-based method for evaluating the good yield rate (GYR) of systems-on-chip (SoC) during fabrication. Testing and yield evaluation at high confidence are two of the most critical issues for the success of SoC as a viable technology. The proposed method relies on different features of fabrication, which are quantified by the so-called Fabrication environmental parameters (EPs). EPs can be highly correlated to the yield, so they are analyzed using statistical methods to improve its accuracy and ultimately direct the test process to an efficient execution. The novel contributions of the proposed method are: 1) to …
Hands-On Projects And Exercises To Strengthen Understanding Of Basic Computer Engineering Concepts, Rohit Dua, John E. Seiffertt Iv, Brian Blaha, Kapil Gupta, Venkat Satagopan, R. Joe Stanley, Daryl G. Beetner, Donald C. Wunsch
Hands-On Projects And Exercises To Strengthen Understanding Of Basic Computer Engineering Concepts, Rohit Dua, John E. Seiffertt Iv, Brian Blaha, Kapil Gupta, Venkat Satagopan, R. Joe Stanley, Daryl G. Beetner, Donald C. Wunsch
Electrical and Computer Engineering Faculty Research & Creative Works
The Introduction to Computer Engineering course at the University of Missouri-Rolla provides a thorough understanding of basic digital logic analysis and design. The course covers: digital numbering systems, Boolean algebra, function minimization using Karnaugh maps (K-maps), memory elements, and sequential logic design. Students' grades are determined by their performance on homework assignments, quizzes, and in-class examinations. A laboratory course (optional for all but EE and CpE majors) supplements the lecture by providing experiments that include analysis and design using Mentor Graphics and FPGAs. While the laboratory is a very useful supplement to the lecture, almost half the students taking the …
Blue-Box Approach To Power Electronics And Machines Educational Laboratories, Robert S. Balog, Zakdy Sorchini, Jonathan W. Kimball, Patrick L. Chapman, Philip T. Krein, Peter W. Sauer
Blue-Box Approach To Power Electronics And Machines Educational Laboratories, Robert S. Balog, Zakdy Sorchini, Jonathan W. Kimball, Patrick L. Chapman, Philip T. Krein, Peter W. Sauer
Electrical and Computer Engineering Faculty Research & Creative Works
Our approach to laboratory education in power electronics and electric machines is presented. The approach centers upon "blue-box" laboratory components, that aid the student in rapid experiment assembly without disguising important aspects of the hardware. Several example experiments are presented. Schematics and construction techniques for the hardware are publicly available.
Ac Impedance Measurement Techniques, Keith Corzine, M. Belkhayat, Yakov L. Familiant, Jing Huang
Ac Impedance Measurement Techniques, Keith Corzine, M. Belkhayat, Yakov L. Familiant, Jing Huang
Electrical and Computer Engineering Faculty Research & Creative Works
Naval ship as well as aerospace power systems are incorporating a greater degree of power electronic switching sources and loads. Although these power electronics based components provide exceptional performance, they are prone to instability due to their high efficiency and constant power characteristics which lead to negative impedance. When designing these systems, integrators must consider the impedance versus frequency at a system interface (which designates source and load). Stability criterions have been developed in terms of source and load impedance for both dc and ac systems and it is often helpful to have techniques for impedance measurement. For dc systems, …
Coupling Between Differential Signals And The Dc Power-Bus In Multilayer Pcbs, Chen Wang, Marco Leone, James L. Drewniak, Antonio Orlandi
Coupling Between Differential Signals And The Dc Power-Bus In Multilayer Pcbs, Chen Wang, Marco Leone, James L. Drewniak, Antonio Orlandi
Electrical and Computer Engineering Faculty Research & Creative Works
Differential and common-mode transfer impedances are proposed herein to analyze noise coupled to (from) the dc power-bus from (to) via transitions in differential signals. Expressions for the two transfer impedances in terms of conventional single-ended transfer impedances are derived and verified through measurements, full-wave finite-difference time-domain (FDTD) simulations and an analytical cavity model. Some properties of the differential and common-mode transfer impedances are investigated to facilitate engineering design. The impact of signal current imbalances on power-bus noise and the benefit of differential signals as compared to single-ended signals are quantified.
Distributed Control Of Hybrid Motor Drives, Shuai Lu, Keith Corzine, T. H. Fikse
Distributed Control Of Hybrid Motor Drives, Shuai Lu, Keith Corzine, T. H. Fikse
Electrical and Computer Engineering Faculty Research & Creative Works
No abstract provided.
Wthd-Optimal Staircase Modulation Of Single-Phase Multilevel Inverters, B. Diong, Keith Corzine
Wthd-Optimal Staircase Modulation Of Single-Phase Multilevel Inverters, B. Diong, Keith Corzine
Electrical and Computer Engineering Faculty Research & Creative Works
No abstract provided.
High-Temperature Monitoring Of Refractory Wall Recession Using Frequency-Modulated Continuous-Wave (Fm-Cw) Radar Techniques, Bivin Varghese, C. Deconick, G. Cartee, M. Velez, Robert E. Moore, R. Zoughi
High-Temperature Monitoring Of Refractory Wall Recession Using Frequency-Modulated Continuous-Wave (Fm-Cw) Radar Techniques, Bivin Varghese, C. Deconick, G. Cartee, M. Velez, Robert E. Moore, R. Zoughi
Electrical and Computer Engineering Faculty Research & Creative Works
Furnaces are among the most crucial components in the glass and metallurgical industry. Nowadays, furnaces are being operated at higher temperatures and for longer periods of time thus increasing the rate of wear on the furnace refractory lining. Consequently, there is a great need for a nondestructive tool that can accurately measure refractory wall thickness at high temperatures. In this paper the utility of a frequency-modulated continuous-wave (FM-CW) radar is investigated for this purpose.
Millimeter Wave Detection Of Localized Anomalies In The Space Shuttle External Fuel Tank Insulating Foam And Acreage Heat Tiles, Sergey Kharkovsky, R. Zoughi, J. T. Case, F. L. Hepburn
Millimeter Wave Detection Of Localized Anomalies In The Space Shuttle External Fuel Tank Insulating Foam And Acreage Heat Tiles, Sergey Kharkovsky, R. Zoughi, J. T. Case, F. L. Hepburn
Electrical and Computer Engineering Faculty Research & Creative Works
Undesired manufactured or in-service produced anomalies in the form of voids in the SOFI and unbonds in the heat tiles can significantly reduce their designed effectiveness. Additionally, unbonds in the heat tiles may cause their complete separation from the fuselage exposing it to extreme heat. Millimeter wave NDT methods are viable candidate for life-cycle inspection of the SOFI and the acreage heat tiles of the Space Shuttle fleet. The results of these investigations described in this paper clearly showed the utility of these methods for detecting localized anomalies in thick SOFI and acreage heat tiles. These methods are fast and …
Wide-Band Lorentzian Media In The Fdtd Algorithm, Marina Koledintseva, James L. Drewniak, David Pommerenke, Giulio Antonini, Antonio Orlandi, Konstantin Rozanov
Wide-Band Lorentzian Media In The Fdtd Algorithm, Marina Koledintseva, James L. Drewniak, David Pommerenke, Giulio Antonini, Antonio Orlandi, Konstantin Rozanov
Electrical and Computer Engineering Faculty Research & Creative Works
This paper considers the case of a wide-band Lorentzian (WBL) algorithm in the finite-difference time-domain (FDTD) modeling of dispersive media. It is shown herein that the WBL model is a physically meaningful and practically useful case of the frequency behavior of materials along with the Debye and narrow-band Lorentzian (NBL). The recursive convolution algorithms for the finite-difference time-domain technique for NBL and WBL models differ. The Debye model, which is suitable for comparatively low-frequency dispersive materials, may not have sufficient number of parameters for describing the wide-band material, especially if this material exhibits pronounced absorption at higher frequencies. It is …
Spare Line Borrowing Technique For Distributed Memory Cores In Soc, B. Jang, Minsu Choi, Nohpill Park, Vincenzo Piuri, Fabrizio Lombardi, Yong-Bin Kim
Spare Line Borrowing Technique For Distributed Memory Cores In Soc, B. Jang, Minsu Choi, Nohpill Park, Vincenzo Piuri, Fabrizio Lombardi, Yong-Bin Kim
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, a new architecture of distributed embedded memory cores for SoC is proposed and an effective memory repair method by using the proposed Spare Line Borrowing (software-driven reconfiguration) technique is investigated. It is known that faulty cells in memory core show spatial locality, also known as fault clustering. This physical phenomenon tends to occur more often as deep submicron technology advances due to defects that span multiple circuit elements and sophisticated circuit design. The combination of new architecture & repair method proposed in this paper ensures fault tolerance enhancement in SoC, especially in case of fault clustering. This …