Digital Commons Network^™

A Platform For False Data Injection In Frequency Modulated Continuous Wave Radar, Ruchir Chauhan

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Radar is an acronym for RAdio Detection And Ranging. In general terms, it is a machine that uses radio waves for object-detection in its near periphery. It transmits radio waves in a known direction, which when intercepted by an obstruction/object are reflected by its surface and are received back at the radar system. The round trip delay time along with the known velocity of radio waves gives an accurate measurement of the distance of the object from the radar system. In a somewhat similar fashion, some radars are even capable of measuring the velocity of this object. Frequency-modulated continuous-wave (FMCW) …

Simulation Of A Magnetron Using Discrete Modulated Current Sources, Sulmer A. Fernández Gutierrez

Boise State University Theses and Dissertations

Magnetrons are microwave oscillators and are extensively used for commercial and military applications requiring power levels from the kilowatt to the megawatt range. It has been proposed that the use of gated field emitters with a faceted cathode in place of the conventional thermionic cathode could be used to control the current injection in a magnetron, both temporally and spatially. In this research, this concept is studied using the 2-D particle trajectory simulation Lorentz2E and the 3-D particle-in-cell (PIC) code VORPAL. The magnetron studied is a ten cavity, rising sun magnetron, which can be modeled easily using a 2-D simulation. …

The Nucleus 2013-2014, Rosalie A. Richards

Science Education Center

No abstract provided.

The Numerical Study Of The Dynamic Behavior Of An Underwater Vehicle, Tsung-Lung Liu, Kuan-Cheng Pan

Journal of Marine Science and Technology–Taiwan

How to employ numerical methods to predict the dynamic behavior of underwater vehicles will become important in the near future. Over the past decade, the results obtained from the Computational Fluid Dynamics (CFD) methods had been proven similar to that of experimental approach with the same test conditions. In order to reduce the computational time of such flow simulation, the concept of relative motion with body-fixed and fluid-moving scheme is usually employed as a conventional procedure to figure out the flow physics around moving bodies. However, the dynamic influence of fluid on a moving vehicle is self-evident and the relative …

Program And Proceedings: Nebraska Academy Of Sciences 1880–2014, 134th Anniversary Year, One Hundred-Twenty-Fourth Annual Meeting, April 11, 2014

Nebraska Academy of Sciences: Programs and Proceedings

Program

Aeronautics and Space Science

Collegiate Academy: Biology

Chemistry and Physics

Collegiate Academy: Chemistry and Physics

Applied Science and Technology

Biological and Medical Sciences

Aeronautics and Space Science, Poster Session

Anthropology

Maiben Memorial Lecture: "Education, Careers and Opportunities in Engineering and Metallurgy in Nebraska," Terry Rasmussen, Nucor Steel, Norfolk, Nebraska

Teaching of Science and Mathematics

Anthropology

Earth Science

Quantitative Imaging Of Radiation Intensity From A Turbulent Sooting Flame, Robert Kapaku

Open Access Theses

Quantitative imaging of radiation intensity (QIRI) is a method of investigating temporally and spatially resolved radiation from species and particulates in turbulent flames. The current study reports quantitative images of radiation intensity from a turbulent ethylene flame that matches the Reynolds number (15,200) of a non-sooting flame from the International Workshop on Measurement and Computation of Turbulent Non-premixed Flames. A calibrated high-speed infrared camera with four band-pass filters was used to acquire images of radiation intensity in wavelengths corresponding to carbon dioxide, water vapor, and soot. The luminous flame measurements show thin radiating structures corresponding to soot layers and higher …

Modeling Preventive Maintenance In Complex Systems, Jessica Rivas

Open Access Theses

This thesis presents an explicit consideration of the impacts of modeling decisions on the resulting maintenance planning. Incomplete data is common in maintenance planning, but is rarely considered explicitly. Robust optimization aims to minimize the impact of uncertainty--here, in contrast, I show how its impact can be explicitly quantified. Doing so allows decision makers to determine whether it is worthwhile to invest in reducing uncertainty about the system or the effect of maintenance. The thesis consists of two parts. Part I uses a case study to show how incomplete data arises and how the data can be used to derive …

Design Of A Lean Manufacturing System For The Production Of Compliant Wind At Sparton Electronics, Arash Sabet-Rasekh

Doctoral Dissertations and Master's Theses

Increased demands in production numbers and higher expectations for product quality in today’s manufacturing industries have led to initiatives to improve processes through lean concepts. This study was conducted to demonstrate how Lean Manufacturing tools and techniques can be used to redesign a production system. The study focuses on the production of the compliant wind at Sparton Electronics. The compliant wind is one of the key components of a sonobuoy and its primary function is to isolate electrical components such as hydrophones from movement of the surface buoy. The goal of the redesign process is to increase production by focusing …

An Investigation Of Business Transformation Disruptors At The Military Strategic Command Level, Thomas Bock

Engineering Management & Systems Engineering Theses & Dissertations

This dissertation contributes an empirical research on business transformation disruption in the military. Specifically, this exploratory research seeks a better understanding of disruption of business transformation and some of the factors that are likely to impact the transformation process at the military strategic command level. A lack of empirical studies existing in the literature, coupled with the continuous transformation challenges faced by military organizations, make it necessary to conduct this empirical study of business transformation disruption in the military.

This research was carried out utilizing a two-phase mixed-methods approach. The first phase included qualitative data gathering through a series of …

Active Control Of Aerial Refueling Drogue, Taeseung Kuk

Dissertations

An active stabilization method for an aerial refueling drogue used in probe-drogue refueling system is presented in this study. The present refueling drogue exhibits an unstable motion due to various turbulent natures, which results in high failure rates and sometimes catastrophic accidents. Although it is considered a routine procedure for human pilot, the workload for mid-air refueling is highly demanding and autonomous operation is by no means a simple task. With rapidly growing use of unmanned aerial vehicles, autonomous aerial refueling is identified as one of essential technologies in future aviation. The present research is a pioneering work in active …

Sic For Advanced Biological Applications, Joseph Register

USF Tampa Graduate Theses and Dissertations

Silicon carbide (SiC) has been used for centuries as an industrial abrasive and has been

actively researched since the 1960's as a robust material for power electronic applications.

Despite being the first semiconductor to emit blue light in 1907, it has only recently been

discovered that the material has crucial properties ideal for long-term, implantable biomedical

devices. This is due to the fact that the material offers superior biocompatibility and

hemocompatibility while providing rigid mechanical and chemical stability. In addition, the material

is a wide-bandgap semiconductor that can be used for optoelectronics, light delivery, and optical

sensors, which is the …

Multi-Rotor--Aided Three-Dimensional 802.11 Wireless Heat Mapping, Scott James Pack

Theses and Dissertations

Traditional wireless site surveys produce a heat-map of link strength or quality over a target area, usually on the ground plane. In recent years research has gone into using aerial drones in network attack and surveillance, making three dimensional awareness of wireless coverage areas of interest. A multi-rotor drone and data collection module were built and tested as part of this research. Site assessments were conducted both in open space and near structures. Collected data was interpolated across the target area, and visualized as points and contours. These visualizations were exported to a Keyhole Markup Language (KML) for visualization in …

Interface Evaluation For Open System Architectures, Joshua A. Burger

Theses and Dissertations

This research develops a deterministic interface evaluation framework (IEF) in support of the principles identified in the Modular Open Systems Approach (MOSA). Interface evaluation in weapon system development requires a Decision Analysis (DA) method capable of handling a continuously growing alternative set and functioning with limited availability of senior decision makers. Value Focused Thinking (VFT) is selected as the best method for addressing the parameters of the framework. Inputs from the Medium Altitude Unmanned Aircraft System program office are used. An initial value threshold is established to guide open interface decisions, based on assessments of 15 historical decision scenarios. Open …

Secure Ads-B: Towards Airborne Communications Security In The Federal Aviation Administration's Next Generation Air Transportation System, Richard C. Agbeyibor

Theses and Dissertations

The U.S. Congress has mandated that all aircraft operating within the National Airspace System, military or civilian, be equipped with ADS-B transponders by the year 2020. The ADS-B aircraft tracking system, part of the Federal Aviation Administration's NextGen overhaul of the Air Transportation System, replaces Radar-based surveillance with a more accurate satellite-based surveillance system. However, the unencrypted nature of ADS-B communication poses an operational security risk to military and law enforcement aircraft conducting sensitive missions. The non-standard format of its message and the legacy communication channels used by its transponders make the ADS-B system unsuitable for traditional encryption mechanisms. FPE, …

Log-Periodic Dipole Array Antenna As Chipless Rfid Tag, S. Gupta, Gui Jun Li, R. C. Roberts, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

A passive chipless radio-frequency identification (RFID) tag based on a log-periodic (LP) dipole array is proposed, where the tailorable bandrejection property of the LP aperture is utilised to realise a large number of codes. The proposed tag principle is successfully validated by measurements, where the absence and presence of the band-rejection is shown to carry the bit information. Its fabrication simplicity is also demonstrated by its implementation on a flexible substrate. Finally, two different tag formation schemes, based on a specific set of resonance suppressions, are discussed in detail. © 2014 The Institution of Engineering and Technology.

The Santa Clara, 2014-01-30, Santa Clara University

The Santa Clara

No abstract provided.

Towards A Set Of Metrics To Guide The Generation Of Fake Computer File Systems, Ben Whitham

Australian Digital Forensics Conference

Fake file systems are used in the field of cyber deception to bait intruders and fool forensic investigators. File system researchers also frequently generate their own synthetic document repositories, due to data privacy and copyright concerns associated with experimenting on real-world corpora. For both these fields, realism is critical. Unfortunately, after creating a set of files and folders, there are no current testing standards that can be applied to validate their authenticity, or conversely, reliably automate their detection. This paper reviews the previous 30 years of file system surveys on real world corpora, to identify a set of discrete measures …

A Mobile Self-Leveling Landing Platform For Small-Scale Uavs, Stephen Austin Conyers

Electronic Theses and Dissertations

This thesis presents a semi-autonomous mobile self-leveling landing platform designed to launch, recover and re-launch VTOL UAVs without the need for human intervention. The landing platform is rugged, lightweight and inexpensive, making it ideal for civilian applications that require a base station from which a rotorcraft UAV can be launched and recovered on terrain that is normally unsuitable for UAV operations. This landing platform is capable of self-leveling on rough terrain and inclined slopes, and can autonomously operate in remote locations for extended periods of time using large onboard lithium batteries and wireless communication. This thesis discusses the unique design …

The Significance Of The Transition Of Supervisory Control And Data Acquisition (Sada) Systems To Tcp/Ip Platforms, Matthew Alexander Care

Senior Honors Projects, 2010-2019

SCADA system security is a significant United States national security issue based on the systems’ vulnerabilities and the cyber threats that seek to exploit them. Within the last fifteen years as SCADA systems have collectively transitioned to Transmission Control Protocol/ Internet Protocol (TCP/IP) networks, analysts and policy-makers have expressed increased concern over the general security and protection of SCADA systems, which are responsible for monitoring and controlling our nation’s critical infrastructure. SCADA systems are susceptible based on their ease of entry and their attractiveness as a target. In addition, there a number of cyber threats such as hackers and malware, …

Potential Optimal Gait Performance Of Mauch S-N-S Prosthetic Knee Configurations As Predicted By Dynamic Modeling, Chih-Hao Chien

ETD Archive

Patients with prosthetic legs routinely suffer from abnormal gait patterns which can cause health issues and eventually lower the quality of their lives. Despite the half-century advance in the technology of prosthetic knees, from the purely mechanical to microprocessor controlled systems, patient testing suggests that very little progress has been made in the quality of the kinetics and kinematics of amputee gait. Moreover, the cost of microprocessor controlled prosthetic knees may be 10 times more than the purely mechanical knees. While prosthetic knees have become more complex and expensive, it is not proven that the prosthetic knee is a central …

Up-Dating Investigation Models For Smart Phone Procedures, Brian Cusack, Raymond Lutui

Australian Digital Forensics Conference

The convergence of services in Smart Technologies such as iPhones, Androids and multiple tablet work surfaces challenges the scope of any forensic investigation to include cloud environments, devices and service media. The analysis of current investigation guidelines suggests that each element in an investigation requires an independent procedure to assure the preservation of evidence. However we dispute this view and review the possibility of consolidating current investigation guidelines into a unified best practice guideline. This exploratory research proposes to fill a gap in digital forensic investigation knowledge for smart technologies used in business environments and to propose a better way …

Magnetoelectric Dipole Antenna Arrays, Shulabh Gupta, Li (Lijun) Jun Jiang, Christophe Caloz

Electrical and Computer Engineering Faculty Research & Creative Works

A planar magnetoelectric (ME) dipole antenna array is proposed and demonstrated by both full-wave analysis and experiments. The proposed structure leverages the operation of composite right/left-handed transmission lines under balanced conditions to form high-gain magnetic radiators, combined with radial conventional electric radiators, where the overall structure is excited by a single differential feed. The traveling-wave-type nature of the proposed ME-dipole antenna enables the formation of directive arrays with high-gain characteristics and scanning capability. Peak gains of 10.84 dB and 5.73 dB are demonstrated for the electric dipole and magnetic-dipole radiation components, respectively. © 1963-2012 IEEE.

Instructional Strategies For Scenario-Based Training Of Human Behavior Cue Analysis With Robot-Aided Intelligence, Surveillance, Reconnaissance, Julie Salcedo

Electronic Theses and Dissertations

The U.S. Army desires to improve safety during Intelligence, Surveillance, Reconnaissance (ISR) operations by removing Warfighters from direct line-of-fire by enhancing ISR operational capabilities with unmanned systems, also known as Robot-Aided ISR (RAISR) (DOD, 2013). Additionally, RAISR presents an opportunity to fulfill ISR capability requirements of modern combat environments including: detection of High-Value Individuals (HVI) from safer distances, identification of baseline behavior, and interpretation of adversarial intent (U.S. Army, 2008). Along with the demand and projected acquisition of RAISR technology, there is the added need to design training requirements for system operation and task execution instruction. While documentation identifying specific …

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 …

Idiographic Digital Profiling: Behavioral Analysis Based On Digital Forensics, Chad M. Steel

Journal of Digital Forensics, Security and Law

Idiographic digital profiling (IDP) is the application of behavioral analysis to the field of digital forensics. Previous work in this field takes a nomothetic approach to behavioral analysis by attempting to understand the aggregate behaviors of cybercriminals. This work is the first to take an idiographic approach by examining a particular subject's digital footprints for immediate use in an ongoing investigation. IDP provides a framework for investigators to analyze digital behavioral evidence for the purposes of case planning, subject identification, lead generation, obtaining and executing warrants, and prosecuting offenders.

Determining And Mitigating The Effects Of Firing A Linear Shaped Charge Under Water, Brian Burch

Masters Theses

"When fired under water, a Linear Shaped Charge (LSC) does not penetrate a steel target as well as in air. This lack of performance has been a problem for shaped charge manufacturers and their clients. It was obvious that this degradation of performance is due to water having a higher density than air and water being incompressible compared to air. This study aimed to better determine how the water was affecting the LSC and to provide a method of mitigation.

LSCs of different sizes were submerged under water and fired through the water with and without a target. It was …

Detection And Control Of Small Civilian Uavs, Matthew Peacock

Theses : Honours

With the increasing proliferation of small civilian Unmanned Aerial Vehicles (UAVs), the threat to critical infrastructure (CI) security and privacy is now widely recognised and must be addressed. These devices are easily available at a low cost, with their usage largely unrestricted allowing users to have no accountability. Further, current implementations of UAVs have little to no security measures applied to their control interfaces. To combat the threat raised by small UAVs, being aware of their presence is required, a task that can be challenging and often requires customised hardware.

This thesis aimed to address the threats posed by the …

A Framework For Workforce Management An Agent Based Simulation Approach, Mario Marin

Electronic Theses and Dissertations

In today's advanced technology world, enterprises are in a constant state of competition. As the intensity of competition increases the need to continuously improve organizational performance has never been greater. Managers at all levels must be on a constant quest for finding ways to maximize their enterprises' strategic resources. Enterprises can develop sustained competitiveness only if their activities create value in unique ways. There should be an emphasis to transfer this competitiveness to the resources it has on hand and the resources it can develop to be used in this environment. The significance of human capital is even greater now, …

Where Are The People? The Human Viewpoint Approach For Architecting And Acquisition, Holly A. H. Handley, Beverly G. Knapp, Defense Acquisition Univ Ft Belvoir Va

Engineering Management & Systems Engineering Faculty Publications

The U.S. Department of Defense Architecture Framework (DoDAF) provides a standard framework for transforming systems concepts into a consistent set of products containing the elements and relationships required to represent a complex operational system. However, without a human perspective, the current DoDAF does not account for the human performance aspects needed to calculate the human contribution to system effectiveness and cost. The Human Viewpoint gives systems engineers additional tools to integrate human considerations into systems development by facilitating identification and collection of human-focused data. It provides a way to include Human Systems Integration (HSI) constructs into mainstream acquisition and systems …

Investigation Of Mirror Image Bias: Evidence For The Use Of Psychophysiological Measures As Indicators Of Cognitive Heuristics, Caroline R. Salchak

Browse all Theses and Dissertations

The Mirror Imaging Bias (MIB) is gaining attention as a prominent quality factor in analysts' performance. MIB is an irrationality in which analysts perceive and process information through the filter of personal experience. As evidenced by notable historical events, the consequences of this bias can be dramatic. A way to understand MIB in humans is sought. How analysts analyze data, are trained, and interact with biases is explored. An experiment testing for the appearance of MIB was designed and completed. Measures from an eye tracker as well as physiological measures were collected. Results show a significant correlation between pupil diameter …