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Resilience For Multi-Filter All-Source Navigation Framework With Integrity, Jonathon S. Gipson, Robert C. Leishman Jan 2021

Resilience For Multi-Filter All-Source Navigation Framework With Integrity, Jonathon S. Gipson, Robert C. Leishman

Faculty Publications

The Autonomous and Resilient Management of All-source Sensors (ARMAS) framework monitors residual-space test statistics across unique sensor-exclusion banks of filters, (known as subfilters) to provide a resilient, fault-resistant all-source navigation architecture with assurance. A critical assumption of this architecture, demonstrated in this paper, is fully overlapping state observability across all subfilters. All-source sensors, particularly those that only provide partial state information (altimeters, TDoA, AOB, etc.) do not intrinsically meet this requirement.
This paper presents a novel method to monitor real-time overlapping position state observability and introduces an "observability bank" within the ARMAS framework, known as Stable Observability Monitoring (SOM). SOM …


Acceleration Of Boltzmann Collision Integral Calculation Using Machine Learning, Ian Holloway, Aihua W. Wood, Alexander Alekseenko Jan 2021

Acceleration Of Boltzmann Collision Integral Calculation Using Machine Learning, Ian Holloway, Aihua W. Wood, Alexander Alekseenko

Faculty Publications

The Boltzmann equation is essential to the accurate modeling of rarefied gases. Unfortunately, traditional numerical solvers for this equation are too computationally expensive for many practical applications. With modern interest in hypersonic flight and plasma flows, to which the Boltzmann equation is relevant, there would be immediate value in an efficient simulation method. The collision integral component of the equation is the main contributor of the large complexity. A plethora of new mathematical and numerical approaches have been proposed in an effort to reduce the computational cost of solving the Boltzmann collision integral, yet it still remains prohibitively expensive for …


Extending Critical Infrastructure Element Longevity Using Constellation-Based Id Verification, Christopher M. Rondeau, Michael A. Temple, J. Addison Betances, Christine M. Schubert Kabban Jan 2021

Extending Critical Infrastructure Element Longevity Using Constellation-Based Id Verification, Christopher M. Rondeau, Michael A. Temple, J. Addison Betances, Christine M. Schubert Kabban

Faculty Publications

This work supports a technical cradle-to-grave protection strategy aimed at extending the useful lifespan of Critical Infrastructure (CI) elements. This is done by improving mid-life operational protection measures through integration of reliable physical (PHY) layer security mechanisms. The goal is to improve existing protection that is heavily reliant on higher-layer mechanisms that are commonly targeted by cyberattack. Relative to prior device ID discrimination works, results herein reinforce the exploitability of constellation-based PHY layer features and the ability for those features to be practically implemented to enhance CI security. Prior work is extended by formalizing a device ID verification process that …


Agile Software Development: Creating A Cost Of Delay Framework For Air Force Software Factories, J. Goljan, Jonathan D. Ritschel, Scott Drylie, Edward D. White Jan 2021

Agile Software Development: Creating A Cost Of Delay Framework For Air Force Software Factories, J. Goljan, Jonathan D. Ritschel, Scott Drylie, Edward D. White

Faculty Publications

The Air Force software development environment is experiencing a paradigm shift. The 2019 Defense Innovation Board concluded that speed and cycle time must become the most important software metrics if the US military is to maintain its advantage over adversaries.1 This article proposes utilizing a cost-o­f-d­elay (CoD) framework to prioritize projects toward optimizing readiness. Cost-­of-d­elay is defined as the economic impact resulting from a delaying product delivery or, said another way, opportunity cost. In principle, CoD assesses the negative impacts resulting from changes to the priority of a project.


A Learning Curve Model Accounting For The Flattening Effect In Production Cycles, Evan R. Boone, John J. Elshaw, Clay M. Koschnick, Jonathan D. Ritschel, Adedeji B. Badiru Jan 2021

A Learning Curve Model Accounting For The Flattening Effect In Production Cycles, Evan R. Boone, John J. Elshaw, Clay M. Koschnick, Jonathan D. Ritschel, Adedeji B. Badiru

Faculty Publications

We investigate production cost estimates to identify and model modifications to a prescribed learning curve. Our new model examines the learning rate as a decreasing function over time as opposed to a constant rate that is frequently used. The purpose of this research is to determine whether a new learning curve model could be implemented to reduce the error in cost estimates for production processes. A new model was created that mathematically allows for a “flattening effect,” which typically occurs later in the production process. This model was then compared to Wright’s learning curve, which is a popular method used …


Quantifying The Effects Of Aircraft Engine Upgrades On Operating And Support Costs, Bradford A. Myers, Edward D. White, Jonathan D. Ritschel, R. David Fass Jan 2021

Quantifying The Effects Of Aircraft Engine Upgrades On Operating And Support Costs, Bradford A. Myers, Edward D. White, Jonathan D. Ritschel, R. David Fass

Faculty Publications

For fixed wing aircraft within the U.S. Air Force, Operating and Support (O&S) costs encompass a large portion of total life cycle costs. O&S costs include fuel, maintenance, and engine upgrades. To the authors’ knowledge, no study to date has attempted to empirically quantify the realized effects of new aircraft engines on sustainment costs. Utilizing the Air Force Total Ownership Cost database, they focused on new engines appearing on the C-5s, C-130s, and C-135s. Although narrow in scope, results suggest newer engines have lower fuel costs. Maintenance costs for newer engines were not consistently higher or lower than the engines …


Use Of Factors In Development Estimates: Improving The Cost Analysis Toolkit, Matthew R. Markman, Jonathan D. Ritschel, Edward D. White Jan 2021

Use Of Factors In Development Estimates: Improving The Cost Analysis Toolkit, Matthew R. Markman, Jonathan D. Ritschel, Edward D. White

Faculty Publications

Factor Estimating is a technique commonly used by defense acquisition analysts to develop cost estimations. However, previous studies developing factors for the Engineering and Manufacturing Development (EMD) phase of the life cycle are limited. This research expands the current toolkit for cost analysts by developing cost factors in previously unexplored areas. More specifically, over 400 cost reports are utilized to create new standard cost factors that are delineated by five categories: commodity type, contract type, contractor type, development type, and Service. The factors are developed for those elements that are common in a wide array of projects such as program …


Integrating Cost As A Decision Variable In Wargames, Joshua N. Reese, Jonathan D. Ritschel, Brent T. Langhals, Ryan D. Engle Jan 2021

Integrating Cost As A Decision Variable In Wargames, Joshua N. Reese, Jonathan D. Ritschel, Brent T. Langhals, Ryan D. Engle

Faculty Publications

The US military can no longer afford to be reactive, leaving critical cost analyses to the months and years following operations or full-scale conflicts. By leveraging cost in wargaming as part of the Joint planning process, DOD can provide Congress and the American taxpayers a range of potential costs associated with various military engagements that reflect fiscal and operational realities.


Understanding Flow Characteristics In Metal Additive Manufacturing, Carl R. Hartsfield, Travis E. Shelton, Gregory R. Cobb, Ryan A. Kemnitz, Joseph Weber Jan 2021

Understanding Flow Characteristics In Metal Additive Manufacturing, Carl R. Hartsfield, Travis E. Shelton, Gregory R. Cobb, Ryan A. Kemnitz, Joseph Weber

Faculty Publications

In fluid flow, the frictional effects from interior surfaces of flow components create pressure loss across the surface. Understanding this inherent pressure loss due to friction and other phenomena is important when designing a flow system. For conventional manufacturing, friction loss has been empirically studied and is well known in the engineering community. However, newer manufacturing techniques, such as laser powder bed fusion (LPBF), an additive manufacturing technique, need to be understood. The inherent flow conditions resulting from the additive processes were studied. Test samples were printed with the flow path oriented in the vertical direction with different channel diameters …


African Roots Of Christianity: Christianity Is A Religion Of Africa, Trevor O'Reggio Jan 2021

African Roots Of Christianity: Christianity Is A Religion Of Africa, Trevor O'Reggio

Faculty Publications

No abstract provided.


The Successful Christian Man, Trevor O'Reggio Jan 2021

The Successful Christian Man, Trevor O'Reggio

Faculty Publications

No abstract provided.


Arctic Observations And Numerical Simulations Of Surface Wind Effects On Multi-Angle Snowflake Camera Measurements, Kyle E. Fitch, Chaoxun Hang, Ahmad Talaei, Timothy Garrett Jan 2021

Arctic Observations And Numerical Simulations Of Surface Wind Effects On Multi-Angle Snowflake Camera Measurements, Kyle E. Fitch, Chaoxun Hang, Ahmad Talaei, Timothy Garrett

Faculty Publications

Ground-based measurements of frozen precipitation are heavily influenced by interactions of surface winds with gauge-shield geometry. The Multi-Angle Snowflake Camera (MASC), which photographs hydrometeors in free-fall from three different angles while simultaneously measuring their fall speed, has been used in the field at multiple midlatitude and polar locations both with and without wind shielding. Here, we present an analysis of Arctic field observations – with and without a Belfort double Alter shield – and compare the results to computational fluid dynamics (CFD) simulations of the airflow and corresponding particle trajectories around the unshielded MASC. MASC-measured fall speeds compare well with …


A Comparison Of Aerodynamic Models For Optimizing The Takeoff And Transition Of A Bi-Wing Tailsitter, Ryan Anderson, Jacob Willis, Jacob Johnson, Andrew Ning, Randal Beard Jan 2021

A Comparison Of Aerodynamic Models For Optimizing The Takeoff And Transition Of A Bi-Wing Tailsitter, Ryan Anderson, Jacob Willis, Jacob Johnson, Andrew Ning, Randal Beard

Faculty Publications

Electric vertical takeoff and landing (eVTOL) aircraft take advantage of distributed electric propulsion as well as aerodynamic lifting surfaces to take off vertically and perform long-duration flights. Complex aerodynamic interactions and a hard-to-predict transition maneuver from hover to wing-borne flight are one challenge in their development. To address this, we compare three different interaction models of varying fidelity for optimizing the transition trajectory of a biplane tailsitter. The first model accounts for simplified rotor-on-wing interactions using momentum theory, while the other two account for wing-on-wing interactions using a vortex lattice method and rotor-on-wing aerodynamic interactions using blade element momentum theory. …


Solar Tracking Apparatuses Including One Or More Solar Panels, Systems Including The Same, And Methods Of Using The Same, Michael T. Searcy, Scott Ure Jan 2021

Solar Tracking Apparatuses Including One Or More Solar Panels, Systems Including The Same, And Methods Of Using The Same, Michael T. Searcy, Scott Ure

Faculty Publications

Embodiments disclosed herein relate to solar tracking apparatuses , systems that include the same, and methods of operating the same. An example solar tracking apparatus includes a structure attachment portion configured to be attached to a structure (e.g., a moveable or stationary structure) and to remain relatively stationary relative to the structure. The structure attachment portion may include one or more mounts configured to attach the structure attachment portion to the structure. The solar tracking apparatus also includes at least one solar panel portion coupled to the structure attachment portion. The solar panel portion may be configured to move relative …


User Guide For Dust Modeling Using Cmaq 5.3.1 And Wrf 4.2.1, Zachary D. Lawless, Ariel S. Cable, Cameron B. Van Dyke, Bradley R. Adams Jan 2021

User Guide For Dust Modeling Using Cmaq 5.3.1 And Wrf 4.2.1, Zachary D. Lawless, Ariel S. Cable, Cameron B. Van Dyke, Bradley R. Adams

Faculty Publications

Researchers at Brigham Young University (BYU) have developed a software framework for modeling dust emission and transport using the Community Multiscale Air Quality (CMAQ) modeling system in conjunction with the Weather Research and Forecasting (WRF) model and other utility programs. This framework uses meteorological data, land use data, and soil properties to predict dust concentrations for a specified area. This User Guide describes the start-to-finish process required to install and utilize relevant software to calculate and visualize dust concentrations. Note that the examples and figures provided in the guide are specific to Utah in the western United States, where this …


Rationalizing Self-Defeating Behaviors: Theory And Evidence, Lars J. Lefgren, Olga B. Stoddard Jan 2021

Rationalizing Self-Defeating Behaviors: Theory And Evidence, Lars J. Lefgren, Olga B. Stoddard

Faculty Publications

Why do individuals engage in self-defeating behaviors like self-harm, addiction, and risky sexual behaviors? Why do they experience the apathy of depression or inaction when trapped by multiple competing problems? We propose a framework for explaining these and other related behaviors based on the insight that individuals can only experience a limited number of latent stimuli to which they are exposed. We conduct an experiment to test this model and find that more than two thirds of the subjects behave consistent with our theoretical framework.


Perceived Family And Partner Support And The Work-Family Interface: A Meta-Analytic Review, Heather H. Kelley, Ashley B. Lebaron, E. Jeffery Hill, Diana Meter Jan 2021

Perceived Family And Partner Support And The Work-Family Interface: A Meta-Analytic Review, Heather H. Kelley, Ashley B. Lebaron, E. Jeffery Hill, Diana Meter

Faculty Publications

This study employed meta-analytic techniques to elucidate the role of perceived partner and family support in four measures of the work-family interface. We extracted 183 effect sizes from 82 samples and a total of N = 36,226 individuals. We found perceived familial (partner and family) support was negatively associated with work-to-family conflict (r = -.099) and family-to-work conflict (r = -.178). It was positively associated with work-to-family enrichment (r = .173) and family-to-work enrichment (r = .378). Various sample-level moderators were investigated through meta regression and subgroup analyses, including whether the support measure was family or partner focused. Perceived family …


After The Dust Settles: The Church And Public Affairs In 2020, Nicholas P. Miller Jan 2021

After The Dust Settles: The Church And Public Affairs In 2020, Nicholas P. Miller

Faculty Publications

No abstract provided.


The Discounted Labor Of Bipoc Students And Faculty, Taleed El-Sabawi, Madison Fields Jan 2021

The Discounted Labor Of Bipoc Students And Faculty, Taleed El-Sabawi, Madison Fields

Faculty Publications

Black Law Students experienced a different COVID-19 pandemic than their majority counterparts due in part to the emotional and physical toll caused by the violent, public mistreatment of Black persons at the hands of law enforcement. While some law faculty at some institutions were proactive in identifying the struggles that their Black students were facing, most law faculty and administrators did nothing—prompting Black students to take time away from their studies to organize, draft letters, gather signatures, and have very uncomfortable conversations with university administrators and faculty about the need for change. Meanwhile, Black faculty and faculty of color, who …


Determinants And Consequences Of Noncompliance With The 2013 Coso Framework, Kunsu Park, Juan Qin, Timothy Seidel, Jian Zhou Jan 2021

Determinants And Consequences Of Noncompliance With The 2013 Coso Framework, Kunsu Park, Juan Qin, Timothy Seidel, Jian Zhou

Faculty Publications

The Securities and Exchange Commission (SEC) requires firms to use a ‘‘suitable framework” as a basis for evaluating the effectiveness of internal control over financial reporting. The COSO 1992 framework was the most commonly used suitable framework until it was superseded by the COSO 2013 framework. Because strict compliance with the updated framework was not enforced by regulatory authorities, a nontrivial number of firms did not comply in a timely fashion. We investigate determinants and consequences of noncompliance with the COSO 2013 framework following the supersession of the COSO 1992 framework. We find that noncompliance is positively associated with proxies …


How Has The Change In The Way Auditors Determine The Audit Report Date Changed The Meaning Of The Audit Report Date? Implications For Academic Research, Steven M. Glover, James C. Hansen, Timothy Seidel Jan 2021

How Has The Change In The Way Auditors Determine The Audit Report Date Changed The Meaning Of The Audit Report Date? Implications For Academic Research, Steven M. Glover, James C. Hansen, Timothy Seidel

Faculty Publications

Archival research in accounting often relies on the audit report date to capture the constructs of audit efficiency, audit timeliness, audit effort, or audit completion. Auditors’ view of what constitutes sufficient appropriate evidence to support the audit opinion, and consequently the date of the audit report, previously coincided with the substantial completion of audit fieldwork, which would be days or weeks before a 10-K filing. However, this view has shifted to coincide with the timing of the public issuance of clients’ financial statements (i.e., the 10-K filing date) following several regulatory actions, audit practice changes, and professional standard setting changes …


Issues Related To The Assessment Of The Effectiveness Of Management Review Controls: Roundtable Summary, Douglas F. Prawitt Jan 2021

Issues Related To The Assessment Of The Effectiveness Of Management Review Controls: Roundtable Summary, Douglas F. Prawitt

Faculty Publications

The Center for Audit Quality and the Financial Education & Research Foundation(FERF) of Financial Executives International (FEI) commissioned John Fogarty, Mark Beasley and Doug Prawitt to conduct an independent qualitative research study on Internal Control over Financial Reporting (ICFR) management review controls (MRCs), Perspectives on Management Review Controls: Challenges and Solutions (the Research Report). The research focused on subjective, judgmentbased MRCs. Through a series of detailed, semistructured interviews with preparers – in particular the control owners and control performers – the researchers gathered perspectives on how management determines what constitutes effective design, precision, implementation, execution and documentation of MRCs. The …


Beyond Borders: Uncertainty In Supragovernmental Tax Enforcement And Corporate Investment, Zackery D. Fox, Martin Jacob, Jaron H. Wilde, Ryan J. Wilson Jan 2021

Beyond Borders: Uncertainty In Supragovernmental Tax Enforcement And Corporate Investment, Zackery D. Fox, Martin Jacob, Jaron H. Wilde, Ryan J. Wilson

Faculty Publications

Amid growing globalization, many countries have offered tax incentives to attract corporate investment. Prior research studies the role such incentives play in firms’ location and investment choices. However, we have limited evidence on the role that uncertainty about the intensity of future tax enforcement plays in those decisions. In 2013, the European Commission (“E.C.”) abruptly began investigating tax ruling practices of several countries in response to allegations that certain firms received preferential tax treatment (“state aid cases”). We use this setting to study the economic consequences of increased uncertainty about future tax enforcement. We find evidence consistent with significant reductions …


Migrating Genes: Using Adna And Archaeological Data To Explain Migration In The Casas Grandes Region Of Northern Mexico, Meradeth Snow, Michael T. Searcy Jan 2021

Migrating Genes: Using Adna And Archaeological Data To Explain Migration In The Casas Grandes Region Of Northern Mexico, Meradeth Snow, Michael T. Searcy

Faculty Publications

Migration as an archaeological topic has addressed huge distances, such as the colonization of the Americas, as well as smaller regions, such as the peopling of specific sites. The use of genetics as a medium to enhance our understanding of population movement can be an asset. There are potential pitfalls, however, such as the misrepresentation of DNA ranging across the landscape without human vectors or motivations. Genetic data must be interpreted through the lens of all available data from the site and surrounding region in order to understand how it its into the potential for human migration. These ideas will …


Increasing Workplace Diversity: Evidence From A Recruiting Experiment At A Fortune 500 Company, Jeffrey A. Flory, Andreas Leibbrandt, Christina Rott, Olga B. Stoddard Jan 2021

Increasing Workplace Diversity: Evidence From A Recruiting Experiment At A Fortune 500 Company, Jeffrey A. Flory, Andreas Leibbrandt, Christina Rott, Olga B. Stoddard

Faculty Publications

While many firms have set ambitious goals to increase diversity in their ranks, there is a dearth of empirical evidence on effective ways to reach them. We use a natural field experiment to test several hypotheses on effective means to attract minority candidates for top professional careers. By randomly varying the content in recruiting materials of a major financial services corporation with more than 10,000 employees, we find that signaling explicit interest in employee diversity more than doubles the interest in openings among racial minority candidates, as well as the likelihood that they apply and are selected. Impacts on gender …


Balaam In The Book Of Numbers, Dana M. Pike Jan 2021

Balaam In The Book Of Numbers, Dana M. Pike

Faculty Publications

Balaam, the non-Israelite who prophesied positively about the Israelites, remains an enigmatic biblical figure, at least in part, because we cannot fully or confidently answer several important questions about him. The account of Balaam in Numbers 22–24 is oddly unique and reads like an independent unit, but it connects in several ways with the content and themes of the rest of the book of Numbers. So, however this account developed and was incorporated into the book of Numbers, it can at least be appreciated as part of the organic whole of the book.


Kinematic And Acoustic Changes To Vowels And Diphthongs In Bite Block Speech, Christopher Dromey, Michelle Richins, Tanner Low Jan 2021

Kinematic And Acoustic Changes To Vowels And Diphthongs In Bite Block Speech, Christopher Dromey, Michelle Richins, Tanner Low

Faculty Publications

Purpose: We examined the effect of bite block insertion (BBI) on lingual movements and formant frequencies in corner vowel and diphthong production in a sentence context. Method: Twenty young adults produced the corner vowels (/u/, /ɑ/, /æ/, /i/) and the diphthong /ɑɪ/ in sentence contexts before and after BBI. An electromagnetic articulograph measured the movements of the tongue back, middle, and front. Results: There were significant decreases in the acoustic vowel articulation index and vowel space area following BBI. The kinematic vowel articulation index decreased significantly for the back and middle of the tongue but not for the front. There …


A Perceptual Study Of Cross-Language Influence On Vocal Fry Use In Women Exposed To Two Languages, Todd A. Gibson, Connie Summers Jan 2021

A Perceptual Study Of Cross-Language Influence On Vocal Fry Use In Women Exposed To Two Languages, Todd A. Gibson, Connie Summers

Faculty Publications

Cross-linguistic influence has been observed across all domains of language. However, nothing is known about the role of cross-linguistic influence in bilingual speakers’ use of vocal fry. Several recent studies have identified an upsurge in the use of vocal fry among female speakers of American English. We sought to identify cross-linguistic influence in vocal fry use by women living in the US and exposed to both English and Spanish. Participants were categorized as functionally monolingual in English (n = 25), functionally monolingual in Spanish (n =23) and relatively balanced bilingual (n = 10) based on responses to language experience questionnaires. …


Forgiveness And Gratitude As Mediators Between Religious Commitment And Well-Being Among Latter-Day Saint Polynesian Americans, Davis Kealanohea Kane, G. E. Kawika Allen, Timothy B. Smith, M Ming, Aaron Jackson, Derek Griner, Elizabeth Cutrer-Parraga Jan 2021

Forgiveness And Gratitude As Mediators Between Religious Commitment And Well-Being Among Latter-Day Saint Polynesian Americans, Davis Kealanohea Kane, G. E. Kawika Allen, Timothy B. Smith, M Ming, Aaron Jackson, Derek Griner, Elizabeth Cutrer-Parraga

Faculty Publications

An abundance of research has investigated well-being as it relates to religiosity and character strengths, such as forgiveness and gratitude. However, few studies have investigated how increases in forgiveness and gratitude might explain why religious commitment enhances well-being, particularly for U.S. ethnic/racial minority populations. This study investigated if the character strengths of forgiveness and gratitude mediated the relationship between religious commitment and well-being among Latter-day Saint Polynesian Americans – a fast growing, yet understudied, population. Results indicated that forgiveness and gratitude fully mediated the relationship between religious commitment and self-esteem, and gratitude partially mediated the relationship between religious commitment and …


Validating A Blended Teaching Readiness Instrument For Primary/Secondary Preservice Teachers, Douglas E. Archibald, Charles R. Graham, Ross Larsen Jan 2021

Validating A Blended Teaching Readiness Instrument For Primary/Secondary Preservice Teachers, Douglas E. Archibald, Charles R. Graham, Ross Larsen

Faculty Publications

Blended learning is the fastest growing teaching modality in North America and much of the world. However, research and training in blended learning are far outpaced by its usage. To remedy this gap, we developed a competency framework and Blended Teaching Readiness Instrument (BTRI) to help teachers and researchers evaluate teacher readiness for blended environments. The purpose of this research is to show that the blended teaching readiness model and accompanying BTRI are reliable for use with teacher candidates both before and after going through a blended teaching course. This knowledge would allow researchers and practitioners to have greater confidence …