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Articles 1 - 13 of 13
Full-Text Articles in Engineering
A Mixed Consensus And Fuzzy Approach To Position Control Of Four-Wheeled Vehicles, Bita Hasheminezhad
A Mixed Consensus And Fuzzy Approach To Position Control Of Four-Wheeled Vehicles, Bita Hasheminezhad
LSU Master's Theses
Autonomous driving is a growing domain of intelligent transportation systems that utilizes communications to autonomously control cooperative vehicles. This thesis presents a multi-agent solution to the platoon control problem. First, an adaptive controller on linearized longitudinal dynamics of a vehicle is applied to assure vehicles are able to track their reference velocities. Then, an agent-based consensus approach is studied which enables multiple vehicles driving together where each vehicle can follow its predecessor at a close distance, safely. To deal with unexpected events, a fuzzy controller is added to the reference signal of the consensus controller. Simulation results are provided to …
Real And Reactive Power Control Of Induction Motor Drives, Juan Rafael Nunez
Real And Reactive Power Control Of Induction Motor Drives, Juan Rafael Nunez
LSU Master's Theses
Induction motors are considered the workhorse in the majority of industrial applications. Their rugged, low-maintenance, and efficient designs keep finding new forms of use nowadays. In this work, power control strategies of induction motor drives based on principles of Direct Torque Control and Model Predictive Control are investigated. The proposed methods control the real and reactive power flow into/out of the machine by selecting and applying proper voltage space phasors to the stator. First, the impact of voltage space phasors on real and reactive power variations is explored. Based on these observations, two methods to choose the appropriate voltage space …
Powers And Compensation In Three-Phase Systems With Nonsinusoidal And Asymmetrical Voltages And Currents, Prashanna Dev Bhattarai
Powers And Compensation In Three-Phase Systems With Nonsinusoidal And Asymmetrical Voltages And Currents, Prashanna Dev Bhattarai
LSU Doctoral Dissertations
A contribution to power theory development of three-phase three-wire systems with asymmetrical and nonsinusoidal supply voltages is presented in this dissertation. It includes: • contribution to explanation of power related phenomena • contribution to methods of compensation The power equation of unbalanced Linear Time Invariant (LTI) loads at sinusoidal but asymmetrical voltage is first presented. The different current components of such a load and the phenomenon associated with these current components are described. The load current decomposition is used for the design of reactive balancing compensators for power factor improvement. Next, the current of LTI loads operating at nonsinusoidal asymmetrical …
Effective 3d Geometric Matching For Data Restoration And Its Forensic Application, Kang Zhang
Effective 3d Geometric Matching For Data Restoration And Its Forensic Application, Kang Zhang
LSU Doctoral Dissertations
3D geometric matching is the technique to detect the similar patterns among multiple objects. It is an important and fundamental problem and can facilitate many tasks in computer graphics and vision, including shape comparison and retrieval, data fusion, scene understanding and object recognition, and data restoration. For example, 3D scans of an object from different angles are matched and stitched together to form the complete geometry. In medical image analysis, the motion of deforming organs is modeled and predicted by matching a series of CT images. This problem is challenging and remains unsolved, especially when the similar patterns are 1) …
An Architecture For Configuring An Efficient Scan Path For A Subset Of Elements, Arash Ashrafi
An Architecture For Configuring An Efficient Scan Path For A Subset Of Elements, Arash Ashrafi
LSU Master's Theses
LaTeX4Web 1.4 OUTPUT Field Programmable Gate Arrays (FPGAs) have many modern applications. A feature of FPGAs is that they can be reconfigured to suit the computation. One such form of reconfiguration, called partial reconfiguration (PR), allows part of the chip to be altered. The smallest part that can be reconfigured is called a frame. To reconfigure a frame, a fixed number of configuration bits are input (typically from outside) to the frame. Thus PR involves (a) selecting a subset C Í S of k out of n frames to configure and (b) inputting the configuration bits for these k frames. …
A Study Of Fpga Resource Utilization For Pipelined Windowed Image Computations, Aswin Vijaya Varma
A Study Of Fpga Resource Utilization For Pipelined Windowed Image Computations, Aswin Vijaya Varma
LSU Master's Theses
In image processing operations, each pixel is often treated independently and operated upon by using values of other pixels in the neighborhood. These operations are often called windowed image computations (or neighborhood operations). In this thesis, we examine the implementation of a windowed computation pipeline in an FPGA-based environment. Typically, the image is generated outside the FPGA environment (such as through a camera) and the result of the windowed computation is consumed outside the FPGA environment (for example, in a screen for display or an engine for higher level analysis). The image is typically large (over a million pixels 1000×1000 …
A Frequency Hopping Method To Detect Replay Attacks, Guofu Tang
A Frequency Hopping Method To Detect Replay Attacks, Guofu Tang
LSU Master's Theses
The application of information technology in network control systems introduces the potential threats to the future industrial control system. The malicious attacks undermine the security of network control system, which could cause a huge economic loss. This thesis studies a particular cyber attack called the replay attack, which is motivated by the Stuxnet worm allegedly used against the nuclear facilities in Iran. For replay attack, this thesis injects the narrow-band signal into control signal and adopts the spectrum estimation approach to test the estimation residue. In order to protect the information of the injected signal from knowing by attackers, the …
Increasing Off-Chip Bandwidth And Mitigating Dark Silicon Via Switchable Pins, Shaoming Chen
Increasing Off-Chip Bandwidth And Mitigating Dark Silicon Via Switchable Pins, Shaoming Chen
LSU Doctoral Dissertations
Off-chip memory bandwidth has been considered as one of the major limiting factors to processor performance, especially for multi-cores and many-cores. Conventional processor design allocates a large portion of off-chip pins to deliver power, leaving a small number of pins for processor signal communication. We observed that the processor requires much less power than that can be supplied during memory intensive stages in some cases. In this work, we propose a dynamic pin switch technique to alleviate the bandwidth limitation issue. The technique is introduced to dynamically exploit the surplus pins for power delivery in the memory intensive phases and …
Nano Cost Nano Patterned Template For Surface Enhanced Raman Scattering (Sers) For In-Vitro And In-Vivo Applications, Hsuan-Chao Hou
Nano Cost Nano Patterned Template For Surface Enhanced Raman Scattering (Sers) For In-Vitro And In-Vivo Applications, Hsuan-Chao Hou
LSU Doctoral Dissertations
Raman scattering is a well-known technique for detecting and identifying complex molecular level samples. The weak Raman signals are enormously enhanced in the presence of a nano-patterned metallic surface next to the specimens. This dissertation describes a technique to fabricate a novel, low cost, high sensitive, disposable, and reproducible metallic nanostructure on a transparent substrate for Surface Enhanced Raman Scattering (SERS). Raman signals can be obtained from the specimen surface of opaque specimens. Most importantly, the metallic nanostructure can be bonded on the end of a probe / a needle, and the other end is coupled to a distant spectrometer. …
Physical Modeling Of Graphene Nanoribbon Field Effect Transistor Using Non-Equilibrium Green Function Approach For Integrated Circuit Design, Yaser Mohammadi Banadaki
Physical Modeling Of Graphene Nanoribbon Field Effect Transistor Using Non-Equilibrium Green Function Approach For Integrated Circuit Design, Yaser Mohammadi Banadaki
LSU Doctoral Dissertations
The driving engine for the exponential growth of digital information processing systems is scaling down the transistor dimensions. For decades, this has enhanced the device performance and density. However, the International Technology Roadmap for Semiconductors (ITRS) states the end of Moore’s law in the next decade due to the scaling challenges of silicon-based CMOS electronics, e.g. extremely high power density. The forward-looking solutions are the utilization of emerging materials and devices for integrated circuits. The Ph.D. dissertation focuses on graphene, one atomic layer of carbon sheet, experimentally discovered in 2004. Since fabrication technology of emerging materials is still in early …
Enhancing Program Soft Error Resilience Through Algorithmic Approaches, Sui Chen
Enhancing Program Soft Error Resilience Through Algorithmic Approaches, Sui Chen
LSU Master's Theses
The rising count and shrinking feature size of transistors within modern computers is making them increasingly vulnerable to various types of soft faults. This problem is especially acute in high-performance computing (HPC) systems used for scientific computing, because these systems include many thousands of compute cores and nodes, all of which may be utilized in a single large-scale run. The increasing vulnerability of HPC applications to errors induced by soft faults is motivating extensive work on techniques to make these applications more resilient to such faults, ranging from generic techniques such as replication or checkpoint/restart to algorithm-specific error detection and …
Scheduling And Tuning Kernels For High-Performance On Heterogeneous Processor Systems, Ye Fang
Scheduling And Tuning Kernels For High-Performance On Heterogeneous Processor Systems, Ye Fang
LSU Doctoral Dissertations
Accelerated parallel computing techniques using devices such as GPUs and Xeon Phis (along with CPUs) have proposed promising solutions of extending the cutting edge of high-performance computer systems. A significant performance improvement can be achieved when suitable workloads are handled by the accelerator. Traditional CPUs can handle those workloads not well suited for accelerators. Combination of multiple types of processors in a single computer system is referred to as a heterogeneous system. This dissertation addresses tuning and scheduling issues in heterogeneous systems. The first section presents work on tuning scientific workloads on three different types of processors: multi-core CPU, Xeon …
Relay Selection Strategies For Multi-Hop Cooperative Networks, Hui Sun
Relay Selection Strategies For Multi-Hop Cooperative Networks, Hui Sun
LSU Doctoral Dissertations
In this dissertation we consider several relay selection strategies for multi-hop cooperative networks. The relay selection strategies we propose do not require a central controller (CC). Instead, the relay selection is on a hop-by-hop basis. As such, these strategies can be implemented in a distributed manner. Therefore, increasing the number of hops in the network would not increase the complexity or time consumed for the relay selection procedure of each hop. We first investigate the performance of a hop-by-hop relay selection strategy for multi-hop decode-and-forward (DF) cooperative networks. In each relay cluster, relays that successfully receive and decode the message …