Browsing Electrical & Computer Engineering Doctoral Work by Title
Now showing items 38-57 of 69
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A Metamaterial-Based Multiband Phase Shifter
(North Dakota State University, 2014)A design methodology for a multi-band phase shifter using a metamaterial-based transmission line was developed. This method is different in that the loaded-line phase shifter has a phase shift of 90 degrees at the center ... -
Metamaterial-Inspired Reconfigurable Series-Fed Arrays
(North Dakota State University, 2014)One of the biggest challenges in modern day wireless communication systems is to attain agility and provide more degrees of freedom in parameters such as frequency, radiation pattern and polarization. Existing phased array ... -
Microwave Measurement of Grain and Biomass
(North Dakota State University, 2022)Microwave measurement is a powerful method for mass prediction and grain detection. Existing systems are well adapted for small volume grain measurements, but cannot accommodate materials other than grain (e.g. biomass), ... -
Mitigating Nonlinear Effect and Preserving Privacy for Memristor Based On-Chip Neural Network
(North Dakota State University, 2021)Memristors offer advantages as a hardware solution for neuromorphic computing, however, their non-ideal property makes the weight update difficult and reduces the accuracy of a neural network. Also, a large amount of ... -
Multisine Excitation Design to Increase the Efficiency of System Identification Signal Generation and Analysis
(North Dakota State University, 2012)Reducing sample frequencies in measurement systems can save power, but reduction to the point of undersampling results in aliasing and possible signal distortion. Nonlinearities of the system under test can also lead to ... -
Network Convergence in Multicarrier Hybrid Cellular Network
(North Dakota State University, 2014)In a multicarrier communication system with known channel state information at transmitter (CSIT), it is well-known that the water-filling power allocation scheme is optimal in achieving the Shannon capacity. However, in ... -
A New Methodology for the Design and Tuning of Robust PID Controllers in Electric Drives
(North Dakota State University, 2014)AC induction motor-drive systems are the backbone for numerous industrial applications, such as aerospace, medical equipment, and nuclear power plants. The control performance of electric drives is sensitive to several ... -
Nonlinear Compensation in Optical Communications Systems using the Nonlinear Fourier Transform
(North Dakota State University, 2017)Nonlinear effects in optical fibers impose a capacity limit for optical communication systems. In this dissertation, the nonlinear Fourier transform (NFT) is investigated as a method to mitigate and compensate for those ... -
A Novel Batteryless Pacemaker: Design, Development, and In Vivo Study in an Ovine Model
(North Dakota State University, 2017)A standard pacemaker can improve a patient's quality of life and may even prolong it, but conventional pacemakers contain leads and batteries, which have their own complications. Hence, the need for a pacemaker with leadless ... -
On Measuring the Robustness of Cloud Computing Systems
(North Dakota State University, 2015)The diverse computing services offered by the cloud computing paradigm have escalated the interest in cloud deployment to a great extent. Cloud systems need to be resilient to uncertainties and perturbations. However, the ... -
Perceptual Video Quality Model and its Application in Wireless Multimedia Communications
(North Dakota State University, 2015)With the exponential growth of video traffic over wireless networked and embedded devices such as mobile phones and sensors, mechanisms are needed to predict the perceptual quality of video in real time and with low ... -
Performance Enhancement of Pipeline ADCs
(North Dakota State University, 2014)The pipeline ADC is mainstream architecture in wireless communication and digital consumer products because of its speed, resolution, dynamic performance, and power consumption. However, there are three areas of concern ... -
A Phase Correction Technique Based on Spatial Movements of Antennas in Real-Time (S.M.A.R.T.) for Designing Self-Adapting Conformal Array Antennas
(North Dakota State University, 2017)This research presents a real-time adaptive phase correction technique for flexible phased array antennas on conformal surfaces of variable shapes. Previously reported pattern correctional methods for flexible phased array ... -
Power System Stability Enhancement through Data Center Ancillary Services
(North Dakota State University, 2015)The primary objective of a control system is stability and steady-state performance under varying dynamics, such as faults and disturbances. The stable power system should continue to function properly in case of faults ... -
Power-Efficient Adaptive Memory Design and Optimization for Video and Deep Learning
(North Dakota State University, 2020)Memory devices such as Static Random-Access Memory (SRAM) and Dynamic Random-Access Memory (DRAM) are dominating members of today’s semiconductor industry. Most of the silicon area in a digital system is occupied by memory ... -
Rare Molecule Biomarker Detection Using Dielectrophoresis Spectroscopy
(North Dakota State University, 2021)According to the American cancer society, 1.9 million new cancer cases and 608,570 cancer deaths are projected to occur in the United States. There is a fundamental technology gap that prevents the availability of tools ... -
Resilient Monitoring and Robust Control towards Blackout Prevention in Modern Power Grids
(North Dakota State University, 2020)This dissertation embodies a comprehensive approach towards resilient monitoring of frid events using Structure Preserving Energy Functions (SPEFs) and introduces a novel control architecture in Multi Terminal Direct Current ... -
A Study of Conformal Metasurfaces on Passive Beam Steering for Arrays
(North Dakota State University, 2022)Beam-steering has drawn significant interest due to the expansion of network capacity. However, a traditional beam steering system involves active phase shifters and controlling networks which can be complex. This work ... -
A Study of Inverter-Based Resources on Power Grid Operation Under Uncertain Operating Conditions
(North Dakota State University, 2022)The electric power grid is undergoing a rapid change predominantly driven by high penetration levels of renewable energy resources (RERs) such as wind and solar. These resources are interfaced with the power grid through ... -
Synthesis of Specifications and Refinement Maps for Real-Time Object Code Verification
(North Dakota State University, 2020)Formal verification methods have been shown to be very effective in finding corner-case bugs and ensuring the safety of embedded software systems. The use of formal verification requires a specification, which is typically ...