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Articles 1 - 27 of 27
Full-Text Articles in Engineering
Mobile Marksman Iv, Nicolas Moreau
Design Of Low Power Alternative Energy Systems With Applications To Experimental Education, Xingjian ‘Harry’ Gao
Design Of Low Power Alternative Energy Systems With Applications To Experimental Education, Xingjian ‘Harry’ Gao
Honors Theses
No abstract provided.
Data Distribution In Hpx, Bibek Ghimire
Data Distribution In Hpx, Bibek Ghimire
LSU Master's Theses
High Performance Computation (HPC) requires a proper and efficient scheme for distribution of the computational workload across different computational nodes. The HPX (High Performance ParalleX) runtime system currently lacks a module that automates data distribution process so that the programmer does not have to manually perform data distribution. Further, there is no mechanism allowing to perform load balancing of computations. This thesis addresses that issue by designing and developing a user friendly programming interface conforming to the C++11/14 Standards and integrated with HPX which enables to specify various distribution parameters for a distributed vector. We present the three different distribution …
Conducting Polymer Nanowires For Multi-Analyte Chemiresistive Sensing, Edward Song
Conducting Polymer Nanowires For Multi-Analyte Chemiresistive Sensing, Edward Song
LSU Doctoral Dissertations
A conducting polymer nanowire-based chemiresistive sensor array was developed for the liquid-phase multi-analyte detection. The ability to distinguish and quantify multiple chemical species with a single sensory device can be useful in many areas including food industry, pollution control, biosensors, and explosives detection. A polyaniline nanowire is a good candidate for use as a chemiresistive sensing material due to its large resistivity change and ease of synthesis. However the two most important issues in chemiresistive sensors are the reproducibility in sensing and the selectivity in chemical species. For improving the reproducibility in polyaniline-based chemiresistive sensing, a self-calibration mechanism was proposed. …
Exploring Invariant Hybrid Color Image Features For Face Recognition Under Illumination Variation, Jayesh Mohan
Exploring Invariant Hybrid Color Image Features For Face Recognition Under Illumination Variation, Jayesh Mohan
LSU Master's Theses
In this thesis, a novel analysis framework is presented in order to automate testing response of an image-feature descriptor algorithm for face recognition under different illumination conditions and white balance calibration over intra- and inter-color space. The experimental results on the OPFD database show that our analysis framework finds the least sensitive channel of a color space for recognizing a face under unknown illumination, unknown white balance, and the both unknown illumination and white balance conditions. The results also show the combination of channels in a color space which are best suited face recognition.
Ethical Hacking Using Penetration Testing, Bharath Kumar Koopari Roopkumar
Ethical Hacking Using Penetration Testing, Bharath Kumar Koopari Roopkumar
LSU Master's Theses
This thesis provides details of the hardware architecture and the software scripting, which are employed to demonstrate penetration testing in a laboratory setup. The architecture depicts an organizational computing asset or an environment.¬¬¬ With the increasing number of cyber-attacks throughout the world, the network security is becoming an important issue. This has motivated a large number of “ethical hackers” to indulge and develop methodologies and scripts to defend against the security attacks. As it is too onerous to maintain and monitor attacks on individual hardware and software in an organization, the demand for the new ways to manage security systems …
Efficient Dense 3d Reconstruction Using Image Pairs, Padmapriya Ravi
Efficient Dense 3d Reconstruction Using Image Pairs, Padmapriya Ravi
LSU Master's Theses
The 3D reconstruction of a scene from 2D images is an important topic in the _x000C_eld of Computer Vision due to the high demand in various applications such as gaming, animations, face recognition, parts inspections, etc. The accuracy of a 3D reconstruction is highly dependent on the accuracy of the correspondence matching between the images. For the purpose of high accuracy of 3D reconstruction system using just two images of the scene, it is important to _x000C_nd accurate correspondence between the image pairs. In this thesis, we implement an accurate 3D reconstruction system from two images of the scene at …
Low Frequency Improvements To Commercial Geophones, Brian Michael Holden
Low Frequency Improvements To Commercial Geophones, Brian Michael Holden
LSU Master's Theses
Commercial geophones have been used in the field of geology for many years. They are commonly used to detect oil and gas deposits and create three dimensional simulations of the earth. Geophones are commonly made up of a spring mounted magnetic mass moving back and forth in a wire coil to create a voltage. The response of the coil is proportional to the velocity of the ground. At various frequencies, seismic events can be measured using a geophone. However, most commercial geophones only allow accurate measurements of frequencies down to approximately five hertz. By using a feedback circuit, an attempt …
Cyber-Physical Security Strategies, Sarah Davis
Cyber-Physical Security Strategies, Sarah Davis
LSU Master's Theses
Cyber-physical security describes the protection of systems with close relationships between computational functions and physical ones and addresses the issue of vulnerability to attack through both cyber and physical avenues. This describes systems in a wide variety of functions, many crucial to the function of modern society, making their security of paramount importance. The development of secure system design and attack detection strategies for each potential avenue of attack is needed to combat malicious attacks. This thesis will provide an overview of the approaches to securing different aspect of cyber-physical systems. The cyber element can be designed to better prevent …
Localization And Security Algorithms For Wireless Sensor Networks And The Usage Of Signals Of Opportunity, Gustavo Andres Chacon Rojas
Localization And Security Algorithms For Wireless Sensor Networks And The Usage Of Signals Of Opportunity, Gustavo Andres Chacon Rojas
LSU Doctoral Dissertations
In this dissertation we consider the problem of localization of wireless devices in environments and applications where GPS (Global Positioning System) is not a viable option. The _x000C_rst part of the dissertation studies a novel positioning system based on narrowband radio frequency (RF) signals of opportunity, and develops near optimum estimation algorithms for localization of a mobile receiver. It is assumed that a reference receiver (RR) with known position is available to aid with the positioning of the mobile receiver (MR). The new positioning system is reminiscent of GPS and involves two similar estimation problems. The _x000C_rst is localization using …
Measurement Of Working, Reflected, And Detrimental Active Power In A Three Phase System, Tracy Toups
Measurement Of Working, Reflected, And Detrimental Active Power In A Three Phase System, Tracy Toups
LSU Doctoral Dissertations
Study of the decomposition of the active power into composite components with respects to power industry economics namely, working active power, reflected active power, and detrimental active power. The working active energy is considered the permanent flow of useful energy to the load that results in deliberate heat, lighting, or torque on the motor shaft. The reflected active energy is the extra component of active energy originating from the load and dissipates on the supply impedance that does not contribute to useful energy. Lastly, detrimental active energy is the flow of harmonic energy from the supply to the load due …
Graphical Models In Characterizing The Dependency Relationship In Wireless Networks And Social Networks, Phuoc Doan Huu Vu
Graphical Models In Characterizing The Dependency Relationship In Wireless Networks And Social Networks, Phuoc Doan Huu Vu
LSU Master's Theses
Semi-Markov processes have become increasingly important in probability and statistical modeling, which have found applications in traffic analysis, reliability and maintenance, survival analysis, performance evaluation, biology, DNA analysis, risk processes, insurance and finance, earthquake modeling, etc. In the first part of this thesis, our focus is on applying semi-Markov processes to modeling the on-off duty cycles of different nodes in wireless networks. More specifically, we are interested in restoration of statistics of individual occupancy patterns of specific users based on wireless RF observation traces. In particular, we present a novel approach to finding the statistics of several operations, namely down-sampling, …
A Diagnosis Feature Space For Condition Monitoring And Fault Diagnosis Of Ball Bearings, Ali Kahirdeh
A Diagnosis Feature Space For Condition Monitoring And Fault Diagnosis Of Ball Bearings, Ali Kahirdeh
LSU Master's Theses
The problem of fault diagnosis and condition monitoring of ball bearings is a multidisciplinary subject. It involves research subjects from diverse disciplines of mechanical engineering, electrical engineering and in particular signal processing. In the first step, one should identify the correct method of investigation. The methods of investigation for condition monitoring of ball bearings include acoustic emission measurements, temperature monitoring, electrical current monitoring, debris analysis and vibration signal analysis. In this thesis the vibration signal analysis is employed. Once the method of analysis is selected, then features sensitive to faults should be calculated from the signal. While some of the …
New Approaches To Smart Grid Security With Scada Systems, Bixiang Tang
New Approaches To Smart Grid Security With Scada Systems, Bixiang Tang
LSU Doctoral Dissertations
The use of information technology in electric power grid introduces the vulnerability problem looming the future smart grid. The supervisory control and data acquisition (SCADA)is the first defense, which itself is undermined by potential malicious attacks. This dissertation studies two particular security threats facing the smart grid and SCADA systems: the unobservable attack and the replay attack. The former is well known in fault detection of the power grid and has received renewed interest in the past a few years, while the latter is motivated by the Stuxnet worm allegedly used against the nuclear facilities in Iran. For unobservable attacks, …
A Virtual Testbed For Embedded Systems, Shrikant Labade
A Virtual Testbed For Embedded Systems, Shrikant Labade
LSU Master's Theses
Hardware-In-the-Loop (HIL) Simulation is a simulation approach in which a hardware embedded processor is connected to the simulation computer that simulates the electrical/mechanical devices controlled by the embedded processor. By using a real-time simulation computer and special-purpose hardware for connecting to the embedded processor, this method of simulation can be very precise but is costly. We are proposing an alternative method, HIL simulation with a network link, in which the device under test (the embedded processor) communicates with the simulation computer over a network connection (in our case a serial line) instead of through special-purpose hardware. We present an abstraction …
Image Enhancement Methods And Applications In Computational Photography, Qinchun Qian
Image Enhancement Methods And Applications In Computational Photography, Qinchun Qian
LSU Doctoral Dissertations
Computational photography is currently a rapidly developing and cutting-edge topic in applied optics, image sensors and image processing fields to go beyond the limitations of traditional photography. The innovations of computational photography allow the photographer not only merely to take an image, but also, more importantly, to perform computations on the captured image data. Good examples of these innovations include high dynamic range imaging, focus stacking, super-resolution, motion deblurring and so on. Although extensive work has been done to explore image enhancement techniques in each subfield of computational photography, attention has seldom been given to study of the image enhancement …
Characterization Of Hybrid Electronic Materials Using Atomic Force Microscopy, Madhavi Divakar Rajathadripura
Characterization Of Hybrid Electronic Materials Using Atomic Force Microscopy, Madhavi Divakar Rajathadripura
LSU Master's Theses
Miniaturization in the electronics industry has been driven by advancements in material science. Recently, Hybrid Electronic Materials (HEMs) have been postulated to have unique material properties that can be used within the semiconductor industry. As such, the main focus of this research is to characterize the relevant properties of HEMs using atomic force microscopy (AFM), conductive probe atomic force microscopy (CP-AFM), and Raman spectroscopy techniques. Emphasis is placed on characterizing [R6G][TPB] GUMBOS which are a Group of Uniform Materials Based on Organic Salts. GUMBOS exhibit properties such as fluorescence and magnetic susceptibility, both of which may be important with respect …
A System Approach To Investing In Uncertain Markets, Iman Khademi
A System Approach To Investing In Uncertain Markets, Iman Khademi
LSU Doctoral Dissertations
We consider the problem of trend-following in US stock market and propose a combined economic and technical model to approach this problem. A bank of linear and nonlinear, discrete-time, low-pass filters with different sampling rates is used to generate timing signals for US stock market indexes such as NASDAQ Composite and S&P 500. These timing signals help us find the appropriate times to step in or out of the market. Back-testing and real-time implementation results along with the risk analysis validate our model. According to the trend of the market, we may adopt a long or short position. If we …
Advanced Statistical Signal Processing Methods In Sensing, Detection, And Estimation For Communication Applications, Hongting Zhang
Advanced Statistical Signal Processing Methods In Sensing, Detection, And Estimation For Communication Applications, Hongting Zhang
LSU Doctoral Dissertations
The applications of wireless communications and digital signal processing have dramatically changed the way we live, work, and learn over decades. The requirement of higher throughput and ubiquitous connectivity for wireless communication systems has become prevalent nowadays. Signal sensing, detection and estimation have been prevalent in signal processing and communications for many years. The relevant studies deal with the processing of information-bearing signals for the purpose of information extraction. Nevertheless, new robust and efficient signal sensing, detection and estimation techniques are still in demand since there emerge more and more practical applications which rely on them. In this dissertation work, …
Performance Comparison Between Patus And Pluto Compilers On Stencils, Pratik Prabhu Hanagodimath
Performance Comparison Between Patus And Pluto Compilers On Stencils, Pratik Prabhu Hanagodimath
LSU Master's Theses
Comparing the performances of Patus and Pluto compilers on stencil applications. Stencils are written in Jacobi and Seidel style of coding and performances of both these compilers are analysed based on these coding styles.
Distributed Stabilization Of Nonlinear Multi-Agent Systems, Jianming Zhou
Distributed Stabilization Of Nonlinear Multi-Agent Systems, Jianming Zhou
LSU Master's Theses
The study of multi-agent systems (MASs) is focused on systems in which many autonomous agents interact and operate within a limited communication environment. The general goal of the MAS research is to design interconnection control laws such that all the dynamic agents in the group are synchronized to a desired common trajectory by exchanging information with adjacent agents over certain constrained communication networks. Based on the review and modification of existing results concerning the consensus control of linear heterogeneous MASs in Moreau (2004) [21], Scardovi and Sepulchre (2009) [25], Wieland et al (2011) [30], and Alvergue et al. (2013) [1], …
Advanced Control Of Small-Scale Power Systems With Penetration Of Renewable Energy Sources, Shaghayegh Kazemlou
Advanced Control Of Small-Scale Power Systems With Penetration Of Renewable Energy Sources, Shaghayegh Kazemlou
LSU Doctoral Dissertations
Stability, protection, and operational restrictions are important factors to be taken into account in a proper integration of distributed energy. The objective of this research is presenting advanced controllers for small-scale power systems with penetration of renewable energy sources resources to ensure stable operation after the network disturbances. Power systems with distributed energy resources are modeled and controlled through applying nonlinear control methods to their power electronic interfaces in this research. The stability and control of both ac and dc systems have been studied in a multi-source framework. The dc distribution system is represented as a class of interconnected, nonlinear …
Integration Of Network Protector Relays On Downtown Distribution Networks With Penetration Of Renewable Energy, Nigel Ramon Jordan
Integration Of Network Protector Relays On Downtown Distribution Networks With Penetration Of Renewable Energy, Nigel Ramon Jordan
LSU Master's Theses
The demand and use of renewable energy sources such as solar panels is steadily increasing in today’s world. Renewable energy sources in distribution networks effectively reduce the amount of load consumed by customers. Renewable energy sources are also a solution to many environmental concerns. However, when these sources of energy are added to downtown networks they interfere with the normal operation of the protective relays and impose challenges such as unexpected tripping of network protector relays. In this paper, the effects of network protector relay operation is studied as a function of increasing photovoltaic (PV) penetration within the secondary grid …
Vocal Fold Analysis From High Speed Videoendoscopic Data, Jing Chen
Vocal Fold Analysis From High Speed Videoendoscopic Data, Jing Chen
LSU Doctoral Dissertations
High speed videoendoscopy (HSV) of the larynx far surpasses the limits of videostroboscopy in evaluating the vocal fold vibratory behavior by providing much higher frame rate. HSV enables the visualization of vocal fold vibratory pattern within an actual glottic cycle. This very detailed infor-mation on vocal fold vibratory characteristics could provide valuable information for the assessment of vocal fold vibratory function in disordered voices and the treatments effects of the behavioral, medical and surgical treatment procedures. In this work, we aim at addressing the problem of classi-fying voice disorders with varying etiology by following four steps described shortly. Our method-ology …
Spectrum Sensing, Spectrum Monitoring, And Security In Cognitive Radios, Erfan Soltanmohammadi
Spectrum Sensing, Spectrum Monitoring, And Security In Cognitive Radios, Erfan Soltanmohammadi
LSU Doctoral Dissertations
Spectrum sensing is a key function of cognitive radios and is used to determine whether a primary user is present in the channel or not. In this dissertation, we formulate and solve the generalized likelihood ratio test (GLRT) for spectrum sensing when both primary user transmitter and the secondary user receiver are equipped with multiple antennas. We do not assume any prior information about the channel statistics or the primary user’s signal structure. Two cases are considered when the secondary user is aware of the energy of the noise and when it is not. The final test statistics derived from …
Carbon Nanotube Inkjet Printing For Flexible Electronics And Chemical Sensor Applications, Ryan P. Tortorich
Carbon Nanotube Inkjet Printing For Flexible Electronics And Chemical Sensor Applications, Ryan P. Tortorich
LSU Master's Theses
Carbon nanotubes (CNTs) are becoming a promising new material for use in many fields including the field of electronics. Their mechanical and electrical properties lend themselves to be used in a new generation of electronic devices, namely flexible electronics. Although many deposition methods for carbon nanotubes exist, inkjet printing offers many advantages including superior patterning ability and low-cost fabrication. Presented in this work is the use of inkjet printing in order to deposit carbon nanotubes onto a flexible transparency film. The methods for developing and printing an aqueous single-walled carbon nanotube (SWCNT) ink and an aqueous multi-walled carbon nanotube (MWCNT) …
Power System Differential Model With Application To Grid Dynamic Simulation, Boyu Wang
Power System Differential Model With Application To Grid Dynamic Simulation, Boyu Wang
LSU Master's Theses
Nonlinearity of power system is always one of the difficulties when dealing with dynamic simulation of power systems. Solving differential-algebraic equations representing power systems are difficult without losing nonlinearity, especially for large power systems. This thesis shows an alternative method to solve nonlinear dynamical power system by producing a purely differential representation of the power systems. This new representation converts the algebraic equations to differential equations in order to have an absolute differential system. By using Runge-Kutta algorithm to solve this differential system, the results of the power system simulations are compared to trapezoidal integration algorithm commonly used to solve …