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Articles 1 - 7 of 7
Full-Text Articles in Engineering
Optimization Of Operational Costs In Data Centers, Shaoming Chen
Optimization Of Operational Costs In Data Centers, Shaoming Chen
LSU Master's Theses
The electricity cost of cloud computing data centers dominated by server power and cooling power is growing rapidly. To tackle this problem, inlet air with moderate temperature and server consolidation are widely adopted. However, the benefit of these two methods is limited due to conventional air cooling systems ineffectiveness caused by re-circulation and low heat capacity. To address this problem, hybrid air and liquid cooling, as a practical and inexpensive approach, has been introduced. In this work, we quantitatively analyze the impact of server consolidation and temperature of cooling water on the total electricity and server maintenance costs in hybrid …
Stochastic Modeling Of Semantic Structures Of Online Movie Reviews, Limeng Pu
Stochastic Modeling Of Semantic Structures Of Online Movie Reviews, Limeng Pu
LSU Master's Theses
Facing the enormous volumes of data available nowadays, we try to extract useful information from the data by properly modeling and characterizing the data. In this thesis, we focus on one particular type of semantic data --- online movie reviews, which can be found on all major movie websites. Our objective is mining movie review data to seek quantifiable patterns between reviews on the same movie, or reviews from the same reviewer. A novel approach is presented in this thesis to achieve this goal. The key idea is converting a movie review text into a list of tuples, where each …
An Efficient Fault Location Algorithm For Shipboard Power Systems, Pedram Jahanmard
An Efficient Fault Location Algorithm For Shipboard Power Systems, Pedram Jahanmard
LSU Master's Theses
The Shipboard Power System (SPS) supply energy to sophisticated systems for navigation, communication, weapons, and operation. Due to the ship’s critical operating condition, faults can be very detrimental. Faults in the SPS may happen because of failure of electrical components or by damages that happen during a battle. These faults may interrupt the paths for supplying energy to loads that are not damaged. To enhance survivability of naval ships, SPS requires an efficient fault location algorithm in order to locate and clear the fault as well as provide an alternative path to supply energy to the loads that are not …
Wireless Localization In The Absence Of Gps, Hyundeok Kang
Wireless Localization In The Absence Of Gps, Hyundeok Kang
LSU Master's Theses
In this thesis, wireless localization is investigated based on multiple noisy estimates of the time-difference of arrival (TDOA) at each pair of the n >= 4 sensors with different but known locations using WiFi opportunistic signals. Our work is comprehensive and includes channel estimation, symbol detection, TDOA estimation, and location estimation. To mitigate the multipath issue induced by wideband signals, such as WiFi, frequency-division is employed to decompose the wideband RF signal into multiple non-overlapping narrowband signals. To minimize the adverse effects of the clock drift, time-division is proposed to divide the signal into multiple non-overlapping signals in the time …
A Distributed Diffusion-Driven Algorithm For Load Balancing In An Electrical Power Grid, Isaac Abhilash Ayyala
A Distributed Diffusion-Driven Algorithm For Load Balancing In An Electrical Power Grid, Isaac Abhilash Ayyala
LSU Master's Theses
In this thesis we propose a distributed algorithm, based on diffusion, to balance loads on an electrical power grid, while maintaining stable operation (system’s ability to maintain bus voltages within preset bounds). This algorithm, called the Diffusion-driven Distributed Load Balancing (DDLB) algorithm, is implemented on the OMNET++ Discrete Event Simulator and the response of the physical grid is simulated on a load flow program, which together simulate a deployment of the DDLB algorithm on the grid. The electrical grid is represented as a graph whose nodes are buses and whose edges are power lines connecting buses. Each node (except the …
Design And Implementation Of A Passive Neurostimulator With Wireless Resonance-Coupled Power Delivery And Demonstration On Frog Sciatic Nerve And Gastrocnemius Muscle, Jose Aquiles Parodi Amaya
Design And Implementation Of A Passive Neurostimulator With Wireless Resonance-Coupled Power Delivery And Demonstration On Frog Sciatic Nerve And Gastrocnemius Muscle, Jose Aquiles Parodi Amaya
LSU Master's Theses
The thesis presented has four goals: to perform a comprehensive literature review on current neurostimulator technology; to outline the current issues with the state-of-the-art; to provide a neurostimulator design that solves these issues, and to characterize the design and demonstrate its neurostimulation features. The literature review describes the physiology of a neuron, and then proceeds to outline neural interfaces and neurostimulators. The neurostimulator design process is then outlined and current requirements in the field are described. The novel neurostimulator circuit that implements a solution that has wireless capability, passive control, and small size is outlined and characterized. The circuit is …
Near Total Resonant Light Absorption In A Graphene Monolayer At Multiple Tunable Wavelengths With Multilayer Structures, Iman Zand
LSU Master's Theses
Graphene could be potentially important for a broad range of photonic and optoelectronic applications. For such graphene-based applications it is critical to enhance the absorption of light in graphene monolayers in order to achieve near total absorption. Several structures have been proposed to enhance light absorption in graphene at visible and infrared wavelengths such as one-dimensional Fabry-Perot cavity structures, and photonic crystal slabs. Fabry-Perot cavity structures, which employ periodic Bragg mirrors, can lead to near total light absorption on resonance. However, such structures cannot achieve near complete absorption in graphene at multiple closely-spaced tunable wavelengths, which is potentially important for …