181-190 of 250 results
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Comparison of Classic Guerrilla Warfare With So-Called Fourth-Generation Warfare Using Agent-Based Modeling and Simulation
PI Jerry Sink
CO-I Mark Abdollahian
Fourth-Generation Warfare (4GW) theory shares many characteristics of classical guerrilla theory (CGW) in security studies literature. Proponents claim that 4GW is a significant evolution that overturns traditional measures of military power, while critics counter that 4GW is simply CGW in an updated context. The two strategies are modeled in an agent-based simulation to evaluate similarities and differences in speed to victory and territory controlled over. Emergent behaviors are compared with historical data.
So-called Fourth-Generation Warfare (4GW) as described by numerous military scholars shares many characteristics of guerrilla tactics in the classical literature, as described by SunTzu, Wellington, Clausewitz, Mao, and Giap. Proponents of 4GW claim that its development has significantly altered the ratio of strength of industrialized and guerrilla forces, and thus the likelihood of "weaker" forces (as measured in previous military contexts) prevailing against forces assessed by traditional measures as stronger. Critics point to a lack of intellectual rigor in defining the salient characteristics of 4GW, and charge that it is simply a re-statement of classical guerrilla war (CGW) tactics, albeit with improved communications and propaganda capabilities, along with a social media cultural context.
This project, which is the topic of the forthcoming PhD dissertation of the author, models CGW and 4GW in an agent-based simulation using NetLogo software in order to explore the differences in time to victory and increased area of territory controlled of CGW and 4GW forces against their respective industrialized and information-age conventional opponents. Expected results include emergent behaviors that offer insights into the similarities and differences of CGW. These are compared to historical data to determine if 4GW is indeed a significant military evolution that threatens to upend traditional measures of military superiority, or if it is merely an adaptation of old tactics to a new context.
Categories: Faculty-Staff
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Astroparticle Physics
PI Darrel Smith
CO-I Brennan Hughey
In the 1950s and 1960s, high-energy and cosmic-ray physics developed into two different fields of research. However, in the last 20 years, they have come together in a most peculiar way. As space physicists explored the sources and mechanisms for producing cosmic rays, they also realized that it was impossible to measure the dynamics of the early universe (i.e., the first 400,000 years).
It is here that particle physics provides a laboratory environment to study the physical processes that occurred in the early universe, a region that cannot be explored directly with the tools of astrophysics. Particle physicists continue to build accelerators with increasing energy densities that simulate the early universe at times less than a microsecond after the "Big Bang." This area of research will investigate how particle physics and astrophysics combine to give us a consistent view of the early universe.Categories: Faculty-Staff
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Exotic Propulsion
PI Darrel Smith
Exotic propulsion has captured the interest of many Embry‑Riddle students. As NASA plans its manned mission to Mars, we come face-to-face with a fundamental dilemma — a round trip to Mars will take almost three years with traditional chemical rockets!
Such a journey would be impossible, as it would require the astronauts to live on Mars for almost a year. Furthermore, the long travel time would expose astronauts to lethal doses of radiation and debilitating periods of weightlessness. For the past 30 years, physicists and engineers have been developing exotic propulsion systems with the expectation of reducing the travel time from years down to months. Exotic propulsion systems under current investigation include plasma engines, matter-antimatter engines and nuclear-powered engines.Categories: Faculty-Staff
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Machine Learning for Dynamic Airspace Configuration towards Optimized Mobility in Emergency Situations
PI Houbing Song
Categories: Faculty-Staff
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NSF REU Site: Swarms of Unmanned Aircraft Systems in the Age of AI/Machine Learning
PI Houbing Song
CO-I Richard Stansbury
Embry‑Riddle Aeronautical University establishes a new Research Experiences for Undergraduates (REU) Site to engage participants in research in drone swarms. The emerging concept of drone swarms, which is defined as the ability of drones to autonomously make decisions based on shared information, creates new opportunities with major societal implications. However, future drone swarm applications and services pose new networking challenges. A resurgence of Artificial Intelligence and machine learning research presents a tremendous opportunity for addressing these networking challenges. There is an overwhelming need to foster a robust workforce with competencies to enable future drone swarm applications and services in the age of AI/machine learning.
The project establishes a new Research Experiences for Undergraduates (REU) Site with a focus on networking research for drone swarms in the age of AI/machine learning at Embry‑Riddle Aeronautical University. The goals of the REU Site are: (1) attract undergraduate students to state-of-the-art drone swarm research, especially those from underrepresented groups, and from institutions with limited opportunities; (2) develop the research capacity of participants by guiding them to perform research on drone swarms; (3) grow the participants’ technical skills to enable a wide variety of beneficial applications of drone swarms; (4) promote the participants’ integrated AI/machine learning and drone swarm competencies; and (5) prepare participants with professional skills for careers. The focus of the REU Site is on the design, analysis and evaluation of innovative computing and networking technologies for future drone swarm applications and services. To be specific, research activities will be conducted in three focus areas, notably dynamic network management, network protocol design, and operationalizing AI/machine learning for drone swarms. Each year eight undergraduate students will participate in a ten-week summer REU program to perform networking research for drone swarms under the guidance of research mentors with rich experiences in AI/machine learning and drone swarms. This REU site is expected to foster workforce knowledge and skills about developing new computing and networking technologies for future drone swarm applications and services. This site is supported by the Department of Defense ASSURE program in partnership with the NSF REU program.
Categories: Faculty-Staff
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Pilot Acceptance of Personal, Wearable Fatigue Monitoring Technology: An Application of the Extended Technology Acceptance Model
PI Rachelle Strong
CO-I Dahai Liu
The research problem of pilot fatigue has been referenced as a causal factor for aircraft accidents in many United States National Transportation and Safety Board (NTSB) accident reports; however, the United States Code of Federal Regulations 14 CFR Part 117, Flight and Duty Limitations and Rest Requirements for Flight Crew Members, does not provide a tangible means of measuring fatigue for aircraft crew members. This problem is relevant to the airline industry and the travelling public because pilot fatigue is preventable as a causal factor in aviation accidents, and pilots need an accurate way to measure it. Adoption of a technology-based solution has been recommended by the NTSB.
The purpose of this study was to determine the factors that affect United States certified airline transport pilots’ behavioral intention to use personal, wearable fatigue monitoring technology (FMT), such as a Fitbit or Apple Watch, to assess their personal fatigue levels. FMT could potentially be used to help meet pilots’ legal requirement to be aware of their personal fatigue levels, per 14 CFR Part 117. The theoretical framework for this study is the Extended Technology Acceptance Model, and the research question is: What factors affect pilots’ behavioral intention to use personal, wearable fatigue monitoring technology, and to what degree? There were ten hypotheses tested that corresponded to different relationships in the model.
The data for this study was collected using an online survey distributed to certified airline transport pilots in the United States, in which the survey questions corresponded to observed variables pertaining to each of the eight factor constructs in the model. The data was analyzed using confirmatory factor analysis (CFA) and structural equation modeling (SEM) techniques to test the hypotheses. The results of the study contributed to the theoretical body of knowledge by demonstrating that a modified version of the Extended Technology Acceptance Model was applicable to U.S. airline transport pilot behavioral intention to use FMT. Six of the ten original hypotheses were supported, and four were not supported.
It was determined that the primary factors that positively affect a pilot’s behavioral intention to use FMT are perceived usefulness and perceived ease of use. Perceived usefulness is positively affected by the external factors of job relevance, results demonstrability, and perceived image or social status, which act as secondary factors positively influencing behavioral intention to use FMT. A tertiary factor influencing behavioral intention to use FMT is subjective norms, which positively influence perceived image, thus positively affecting perceived usefulness and intention to use FMT. Output quality, subjective norms, and perceived ease of use were determined to not have a statistically significant effect on pilots’ perceived usefulness of FMT, and subjective norms were determined not to have a statistically significant effect on pilots’ behavioral intention to use FMT.
The practical significance of this study is that pilots find FMT devices most useful when it is applicable to their jobs, provides tangible results, and increases their social status perception. It is beneficial if others around them think they should use FMT, and that if they use FMT, their social status perception increases. Practical solutions to increase the likelihood of pilot FMT device usage should include wearable device applications that provide features that directly apply to the pilot profession, report data in ways that make sense to pilots, and also make the pilot look and feel stylish. Nearly 87 percent of pilots already wear a watch while flying, and over 40 percent of pilots already wear some form of FMT for personal use, so the challenge going forward is to make the right improvements to the devices to increase usage. Such improvements may include new aviation-themed applications that appeal to pilots and provide results that can help them make more informed decisions, while simultaneously improving the aesthetic to drive an increase in social pressures to wear the FMT devices regularly.
Categories: Graduate
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Mixing of a supercritical jet in a supercritical cross-flow
PI Neil Sullivan
CO-I Mark Ricklick
This project is focused on the exploration and validation of numerical modeling techniques, for the simulation of supercritical jets in crossflow.
The injection of fuels and oxidizers into combustion chambers is often performed at near-critical or supercritical (SC) temperatures and pressures. At the critical point, the surface tension and enthalpy of vaporization of a fluid approach zero. This means there is no droplet formation in a jet, and also no density change between phases. The fluid has in effect only one supercritical phase, and has both liquid-like and gas-like properties. Physical and thermodynamic properties of the fluid have large gradients near the critical point, and this has led to complications in numerical simulation of even simple flow phenomena at this condition.It is desired to simulate the mixing and subsequent combustion of certain supercritical fluids for application to the design of SC-CO2 combustion power generation. SC methane and oxygen will be burned in an atmosphere of SC carbon dioxide, allowing highly efficient power extraction using smaller turbomachinery than in traditional Brayton or Rankine cycles. The study of SC methane jets also has applications to liquid rocket propellant injection and jet impingement rocket nozzle cooling.
Reynolds-Averaged Navier Stokes (RANS) and Large Eddy Simulation (LES) numerical studies are conducted to investigate the diffusion-driven mixing of one or more species in a SC jet, with another species in a SC cross-flow. Real-gas effects will be captured using the Peng-Robinson cubic equation of state. Benchmarking is performed against previous experimental and LES studies performed on near-critical and SC jets in quiescent fluids. The commercial code STAR-CCM+ is used for the simulation.
Improved prediction of jet behavior at near-critical and SC pressures and temperatures will better inform combustor design, combustion efficiency and thermodynamic efficiency.
Ideal gas axisymmetric simulation of a sub-critical nitrogen jet
Categories: Graduate
181-190 of 250 results