Index Catalog // ScholarsArchive@OSU

Efficient key management protocols for mobile ad hoc networks

Creator:: Erdem, Özkan M.
Abstract:: In this thesis, novel solutions are proposed for key management issues in mobile ad hoc networks. Presented Hierarchical Binary Tree (HBT) based model is distributed, self-organizing, scalable and does not employ online key distribution authority or group manager. Two different group authentication and group key establishment protocols are proposed for...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERTATION OF Ozkan M. Erdem for the

Calibration, characterization, and linear quadratic Gaussian estimation of sensor feedback signals for a novel ocean wave energy linear test bed

Creator:: Haller, Christopher A.
Abstract:: Continual growth of the world's energy consumption and the demand for long-term clean renewable energy resources has led to the development of ocean-based wave energy technologies. Emerging technologies are advancing potential solutions to the complex problem of energy generation in the harsh and corrosive ocean environment. To develop these technologies,...
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF Christopher A. Haller for

Evaluating the seismic risk and resilience of an electrical power system

Creator:: Chalishazar, Vishvas H.
Abstract:: The Pacific Northwest is part of the "Ring of Fire," which is well-known for heavy seismic activity. Numerous active faults in the area have encouraged electric grid managers in the region to more deeply contemplate and proactively intervene to support grid resilience. This research introduces Monte Carlo (MC) based power...
Resource Type:: Dissertation
Full Text:: are as follows: p[H|A] denotes the probability of a given Asset (A) experiencing a typical Hazard (H1

Energy-efficient clock generation for communication and computing systems using injection locking

Creator:: Ma, Chao
Abstract:: The design of high-performance, high-speed clock generation and distribution becomes challenging in terms of phase noise, jitter and power consumption, due to the fast development of communication and computing systems. Injection locking is a promising clocking technique since it can significantly improve the energy efficiency, suppress the phase noise of...
Resource Type:: Masters Thesis
Full Text:: helps in and after classes. I am grateful to Prof. Merrick C. Haller for taking the time to serve as

Design techniques for delta sigma modulators using VCO based ADCs

Creator:: Reddy, Karthikeyan
Abstract:: VCO-based ADCs have recently emerged as attractive alternative to conventional DeltaSigma (ΔΣ) modulator architectures. Few salient features of a VCObased ADC are: 1) the quantization noise is 1st order noise shaped, 2) it is an open loop architecture, and, 3) its implementation is mostly digital in nature. Hence, they are...
Resource Type:: Dissertation
Full Text:: being my committee members. I would also like to thank Prof. Merrick Haller for being my Graduate

Enhancing Resolution and Scalability of Power Grid Reliability Algorithms

Creator:: Lassetter, Austin R.
Abstract:: This Thesis aims to determine whether we can improve the accuracy, resolution, and speed of calculations for common power system problems using simple computational models that scale well to machine learning and high performance computing solutions. The second chapter of this Thesis implements more precise aging and degradation models for...
Resource Type:: Masters Thesis

Application of Nonlinear Model Predictive Controller for Ocean Wave Energy Conversion Systems

Creator:: Haider, Ali S.
Abstract:: This work addresses the application of Nonlinear Model Predictive Control (NMPC) to a class of ocean wave energy conversion systems in which the cost functional is not in a standard quadratic form, and the WEC model includes the nonlinear effects, such as the hydrodynamic viscous drag. The NMPC implementation is...
Resource Type:: Dissertation

Methods for evaluating the impact of renewable resource variability on grid operation and planning

Creator:: Halamay, Douglas A.
Abstract:: With the recent interest in increasing the penetration of renewable energy sources onto the power grid, there has been an unprecedented rapid deployment of wind generation, especially in the US Pacific Northwest. While wind farm developers have continued to expand their operations, power system operators are left to deal with...
Resource Type:: Masters Thesis
Full Text:: also like to gratefully acknowledge the assistance of Dr. Tuba Ozkan-Haller in developing the code

Bayesian Reinforcement Learning Based Control For Ocean Wave Energy Conversion

Creator:: Ghorban Zadeh, Leila
Abstract:: This work – in which three peer-reviewed academic papers are presented – addresses the ap-plication of Bayesian Reinforcement Learning to the control of a class of ocean wave energy conversion systems. The first paper presents a comparison of a Reinforcement-Learning (RL) based wave energy converter controller against standard Reactive Damping...
Resource Type:: Dissertation
Full Text:: direction with the highest cumulative reward in my research environment. Committee members, Tuba Ozkan

Risk and Uncertainty Quantification Methods in Electrical Power Systems

Creator:: Johnson, Brandon S.
Abstract:: Load flow studies are one of the most essential engineering applications for grid operators because they provide a clear picture of the operating conditions of the power system. Traditionally, the load flow problem is assumed to be deterministic; that is, the system variables contain no randomness. Unfortunately, this assumption is...
Resource Type:: Dissertation
Full Text:: with each component, and the local wave number kj is calculated for the local water depth h using

Design and Implementation of a Modular Ocean Drifter Kit

Creator:: Green, Austin
Abstract:: Ocean Drifters are a low-cost and easy-to-use platform that are commonly used for studying ocean currents. With added interest in studying the ocean, emphasis has been taken to make it more accessible. A pilot course focused on introducing the topic of ocean sensing was announced. The HC 407 course will...
Resource Type:: Honors College Thesis
Full Text:: . Thomson, A. Ellenson, F. T. Rollano, H. T. Ozkan-Haller, and M. C. Haller, “Kinematics and statistics of

On the design, modeling, and testing of ocean wave energy converters

Creator:: Bosma, Bret
Abstract:: Ocean wave energy converter technology continues to advance and new developers continue to emerge, leading to the need for a general design, modeling, and testing methodology. This work presents a development of the process of taking a wave energy converter from a concept to the prototype stage. A two body...
Resource Type:: Dissertation
Full Text:: . I would like to give special thanks to Doug Halamay and Chris Haller for their camaraderie in the

Sizing and Performance of the Pendulum Power Take-Off Wave Energy Converter: Modularity and Chaotic Behavior

Creator:: Dizon, Chris
Abstract:: Multiple wave energy converter (WEC) archetypes exist with varying power take-off (PTO) designs in the attempt to maximize ocean energy harnessed and converted into useful energy. The pendulum PTO is popular for its simple, yet robust functionality due to its internally located components and simple operation. Additionally, this PTO does...
Resource Type:: Dissertation

A frequency-domain approach to simulating wave energy converter hydrodynamics

Creator:: Simmons, Asher
Abstract:: Wave energy converter (WEC) devices are complicated systems containing hydrodynamic, mechanical, and electrical elements. WEC design efforts are primarily focused in the time-domain, using frequency-based energy analyses and numerical problem solving approaches that are staples in hydrodynamic design efforts to form the basic information set used in these time-domain development...
Resource Type:: Masters Thesis
Full Text:: relationship between wave height (H) and ocean depth (h) is well defined [40, ch. 3.4, pp. 57-58].  Sea

Power system reliability and power quality assessments with grid-connected wave energy converters

Creator:: Boller, Michael D.
Abstract:: Generating abundant, renewable energy from Earth’s oceans is an attractive option for meeting increasing energy demand. Marine renewable energy also comes with the variability of renewable sources, which impact the reliability and power quality of the electrical grid. On a transmission-level, this dissertation looks at ensuring reliability of the power...
Resource Type:: Dissertation

Renewable Energy in the Pacific Northwest - Technical and Economic Analysis of 100% Renewable Portfolios, including Seasonality Impacts and Potential Applications of Energy Storage

Creator:: Harpool, Scott
Abstract:: Renewable electrical energy sources are relatively easy to integrate at moderate penetrations, utilizing a combination of technical and market methods to increase grid flexibility. However, integrating high renewable portfolios is more challenging, and the optimal combination of resources will vary depending on the features of specific geographic areas. This study...
Resource Type:: Dissertation

Testing of wave energy converters using the Ocean Sentinel Instrumentation Buoy

Creator:: Lettenmaier, Terrance
Abstract:: Ocean testing of Wave Energy Converter (WEC) prototypes is necessary to facilitate commercial WEC development. The Ocean Sentinel Instrumentation Buoy, completed in August 2012, provides a stand-alone load for WEC prototypes during ocean testing. The first part of this work was to develop the power conversion and data acquisition equipment...
Resource Type:: Dissertation

Design and Analysis of an Optical Wireless Receiver for a Hybrid WiFi Free-Space Optical (WiFO) Communication Network

Creator:: Borah, Anindita
Abstract:: The increasing demand for higher data-rates in spectrum-deficient indoor WiFi networks calls for the adaptation of hybrid systems, consisting of RF and optical wireless channels. The novel hybrid WiFi Free-Space Optical (WIFO) system was introduced to enhance the wireless capacity of indoor WiFi networks. In this thesis, an optical wireless...
Resource Type:: Masters Thesis
Full Text:: . Haller who is my graduate council representative for my thesis defense. I must express my gratitude to

Atomic solid state energy scale applied to novel thin-film solar absorbers

Creator:: Pelatt, Brian D.
Abstract:: The atomic solid state energy (SSE) scale is introduced as a tool for inorganic materials design. The SSE scale is obtained by assessing an average electron affinity (EA) (for a cation) or an average ionization potential (IP) (for an anion) for each atom using data from compounds having that specific...
Resource Type:: Dissertation
Full Text:: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 3.8 Absorption (α) vs. energy (hν) plot for CdTe and CuInSe2. The band gap is measured at the

ScholarsArchive@OSU

Efficient key management protocols for mobile ad hoc networks

Calibration, characterization, and linear quadratic Gaussian estimation of sensor feedback signals for a novel ocean wave energy linear test bed

Evaluating the seismic risk and resilience of an electrical power system

Energy-efficient clock generation for communication and computing systems using injection locking

Design techniques for delta sigma modulators using VCO based ADCs

Enhancing Resolution and Scalability of Power Grid Reliability Algorithms

Application of Nonlinear Model Predictive Controller for Ocean Wave Energy Conversion Systems

Methods for evaluating the impact of renewable resource variability on grid operation and planning

Bayesian Reinforcement Learning Based Control For Ocean Wave Energy Conversion

Risk and Uncertainty Quantification Methods in Electrical Power Systems

Design and Implementation of a Modular Ocean Drifter Kit

On the design, modeling, and testing of ocean wave energy converters

Sizing and Performance of the Pendulum Power Take-Off Wave Energy Converter: Modularity and Chaotic Behavior

A frequency-domain approach to simulating wave energy converter hydrodynamics

Power system reliability and power quality assessments with grid-connected wave energy converters

Renewable Energy in the Pacific Northwest - Technical and Economic Analysis of 100% Renewable Portfolios, including Seasonality Impacts and Potential Applications of Energy Storage

Testing of wave energy converters using the Ocean Sentinel Instrumentation Buoy

Design and Analysis of an Optical Wireless Receiver for a Hybrid WiFi Free-Space Optical (WiFO) Communication Network

Atomic solid state energy scale applied to novel thin-film solar absorbers

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