Engineering Commons^™

Female Relief Systems In U.S. Military Fighter Ejection Seat Aircraft, Marian C. Schultz, James T. Schultz, Joshua J. Schultz

Journal of Aviation Technology and Engineering

In early aircraft, the amount of fuel the aircraft could carry usually determined how long it could stay in flight. Today, with aircraft being able to air refuel, the time they are able to stay aloft is based more on human needs, one being waste management. Voiding urine in a single-seat ejection seat aircraft has been an issue for male pilots in the past, but with the increasing numbers of female pilots in single-seat aircraft, finding a solution has intensified. This paper reviews the various methods that are available for both male and female pilots, including the newest method which …

Reinventing High School: Competency-Based Model For Learning In The 21st Century, Tahir M. Khan, Denise K. Whitford, Lisa Lambert Snodgrass, Sunnie L. Watson, Lisa B. Bosman

Indiana STEM Education Conference

Research shows that Black and Hispanic workers continue to be under-represented in the STEM (science, technology, engineering and mathematics) workforce. Purdue Polytechnic High School (PPHS) was established to achieve broader academic and workforce goals. PPHS fosters a sense of community for students by fostering diversity in teachers, focusing on project-based learning, and providing students with a constructive and collaborative space to explore their passions. To support career readiness, the school personalizes student learning and focuses on enhancing student problem-solving skills through a structured group engagement program called "passion projects". The school meets the academic requirements of the state while providing …

Reflecting On Recurring Failures In Iot Development, Dharun Anandayuvaraj, James C. Davis

Department of Electrical and Computer Engineering Faculty Publications

As IoT systems are given more responsibility and autonomy, they offer greater benefits, but also carry greater risks. We believe this trend invigorates an old challenge of software engineering: how to develop high-risk software-intensive systems safely and securely under market pressures? As a first step, we conducted a systematic analysis of recent IoT failures to identify engineering challenges. We collected and analyzed 22 news reports and studied the sources, impacts, and repair strategies of failures in IoT systems. We observed failure trends both within and across application domains. We also observed that failure themes have persisted over time. To alleviate …

Reflections On Software Failure Analysis, Paschal C. Amusuo, Aishwarya Sharma, Siddharth R. Rao, Abbey Vincent, James C. Davis

Department of Electrical and Computer Engineering Faculty Publications

Failure studies are important in revealing the root causes, behaviors, and life cycle of defects in software systems. These studies either focus on understanding the characteristics of defects in specific classes of systems or the characteristics of a specific type of defect in the systems it manifests in. Failure studies have influenced various software engineering research directions, especially in the area of software evolution, defect detection, and program repair.

In this paper, we reflect on the conduct of failure studies in software engineering. We reviewed a sample of 52 failure study papers. We identified several recurring problems in these studies, …

Sok: Analysis Of Software Supply Chain Security By Establishing Secure Design Properties, Chinenye Okafor, Taylor R. Schorlemmer, Santiao Torres-Arias, James C. Davis

Department of Electrical and Computer Engineering Faculty Publications

This paper systematizes knowledge about secure software supply chain patterns. It identifies four stages of a software supply chain attack and proposes three security properties crucial for a secured supply chain: transparency, validity, and separation. The paper describes current security approaches and maps them to the proposed security properties, including research ideas and case studies of supply chains in practice. It discusses the strengths and weaknesses of current approaches relative to known attacks and details the various security frameworks put out to ensure the security of the software supply chain. Finally, the paper highlights potential gaps in actor and operation-centered …

Exploiting Input Sanitization For Regex Denial Of Service, Efe Barlas, Xin Du, James C. Davis

Department of Electrical and Computer Engineering Faculty Publications

Web services use server-side input sanitization to guard against harmful input. Some web services publish their sanitization logic to make their client interface more usable, e.g., allowing clients to debug invalid requests locally. However, this usability practice poses a security risk. Specifically, services may share the regexes they use to sanitize input strings — and regex-based denial of service (ReDoS) is an emerging threat. Although prominent service outages caused by ReDoS have spurred interest in this topic, we know little about the degree to which live web services are vulnerable to ReDoS.

In this paper, we conduct the first black-box …

Discrepancies Among Pre-Trained Deep Neural Networks: A New Threat To Model Zoo Reliability, Diego Montes, Pongpatapee Peerapatanapokin, Jeff Schultz, Chengjun Guo, Wenxin Jiang, James C. Davis

Department of Electrical and Computer Engineering Faculty Publications

Training deep neural networks (DNNs) takes significant time and resources. A practice for expedited deployment is to use pre-trained deep neural networks (PTNNs), often from model zoos.collections of PTNNs; yet, the reliability of model zoos remains unexamined. In the absence of an industry standard for the implementation and performance of PTNNs, engineers cannot confidently incorporate them into production systems. As a first step, discovering potential discrepancies between PTNNs across model zoos would reveal a threat to model zoo reliability. Prior works indicated existing variances in deep learning systems in terms of accuracy. However, broader measures of reliability for PTNNs from …

An Empirical Study On The Impact Of Deep Parameters On Mobile App Energy Usage, Qiang Xu, James C. Davis, Y Charlie Hu, Abhilash Jindal

Department of Electrical and Computer Engineering Faculty Publications

Improving software performance through configuration parameter tuning is a common activity during software maintenance. Beyond traditional performance metrics like latency, mobile app developers are interested in reducing app energy usage. Some mobile apps have centralized locations for parameter tuning, similar to databases and operating systems, but it is common for mobile apps to have hundreds of parameters scattered around the source code. The correlation between these "deep" parameters and app energy usage is unclear. Researchers have studied the energy effects of deep parameters in specific modules, but we lack a systematic understanding of the energy impact of mobile deep parameters. …

What Are The Benefits Of Stem Integration In Mathematics Classrooms In Underserved Schools? A Literature Review, Steve Heinold

Indiana STEM Education Conference

The importance of mathematics education and STEM education in K-12 education in the United States is peaking. High stakes testing and focus on 21st Century skills have many schools scrambling to increase test scores while better preparing their students for the “real world.” This literature review looks at the history of STEM education in the United States and the recent focus on STEM integration into core individual subject classrooms, especially mathematics. This review also analyzes the effectiveness of STEM integration to help students from underserved schools and communities. While there is some evidence that engaging and responsive after-school STEM programs …

Teachers' Perceptions On Women In Stem: Breaking The Stereotypes, Lili Zhou, Alankrita Chhikara, Stephanie Oudghiri, Araba A. Z. Osei-Tutu, Razak Kwame Dwomoh

Indiana STEM Education Conference

We designed and offered a Professional Development (PD) course for K-12 in-service teachers and educators across Indiana to address critical theory on race, immigration, English Language Learners (ELLs), and gender. In this study, we investigate teachers’ perceptions on gender stereotypes in STEM from the PD course. We report findings from the analysis of participants’ responses from pre-course surveys and posed discussions during the course.

K-12 Teachers' Perceptions Of Stem, Brittany Vancil, Emily Nicholson

Indiana STEM Education Conference

Integrated Science, Technology, Engineering, and Math (STEM) has been a recent trend in education. We set out to understand how K-12 teachers define STEM, their comfort level with teaching STEM, perspectives on the pros and cons of STEM, and the teaching tools and platforms they use. Our research concludes with the implications for teachers, administrators, curriculum developers, and researchers, as well as helpful resources.

Steppin' Into The Future: Connecting Bipoc Youth To Stem Careers, Jessica V. Forrester, Lesa M. Covington Clarkson, Elena A. Gullickson

Indiana STEM Education Conference

Exposure to science, technology, engineering and mathematics (STEM) careers is essential for urban education in order to diminish deficit-based assumptions about who can succeed in STEM. Prepare2Nspire (P2N) acts as an extracurricular tutoring outlet for in-school mathematics learning as well as an opportunity for youth to become exposed to STEM careers through various methods. First, undergraduate mentutors of color represent a number of STEM academic majors. Second, P2N invites STEM professionals of color to discuss how they use various mathematics skills within their career. The purpose of introducing students of color to underrepresented college students and STEM professionals is to …

Contents, William S. Walker Iii, Lynn A. Bryan Ph. D., S. Selcen Guzey, Elizabeth Suazo-Flores

Indiana STEM Education Conference

No abstract provided.

Integrating Wave-Powered Batch Reverse Osmosis With Pressure Retarded Osmosis For Higher Efficiency Desalination Method, David M. Warsinger, Akshay Rao, Abhimanyu Das, Sultan Alnajdi, Ali Naderi, Antonio Esquivel, Alondra Ramos, Cole Heald, Vivek Singh, Ryan Soltis, Kaitlyn Kelsey, Adriana Hisham, Aaron Harp, Bryan Pamintuan, Paige Beck, Matthew Sheridan, John Pacholski, Carolina Bernal Botero

School of Mechanical Engineering Faculty Publications

Overpopulation, intensive industrial water usage and climate change are some of the occurrences that are exacerbating global water scarcity. By 2050, the United Nations predicts that over 6 billion people will be affected by water scarcity. Over 70% of the earth's surface is covered by oceans yet its water remains unusable due to the high salinity of seawater. Reverse Osmosis (RO) is the most common method of desalinating water but is dependent on non-renewable generated electricity to meet its high energy requirements. The majority of the power supplied to desalination plants is generated using emission-heavy fuels. Given the UN’s goal …

Engaging Elementary School Students And Their Parents In After-School Stem Activities, Yury A. Kuleshov, Anne M. Lucietto

Indiana STEM Education Conference

The authors are implementing a program to engage elementary school students and parents in after-school STEM activities to promote technical disciplines and STEM career paths. Children from Hispanic communities are often left behind when promoting STEM among the youth. The program will be available in two languages, English and Spanish, to address the gap. The authors will conduct post-program surveys with the parents of the participating children to access participants’ perception of STEM. The results will guide future STEM activities among elementary school students in the local community and be useful for other STEM teachers, who target Hispanic and other …

Bridging The Gap: Connecting High School Students To Advanced Stem Education Through Online Learning Modules, Kathleen Jurecka, Stacey D. Lyle Rpls

Indiana STEM Education Conference

Texas A&M researchers worked in partnership with the VA to extend the memorialization of Texas A&M Aggie veterans enshrined in the Houston National Cemetery though the Aggie Legacy Project. This was accomplished using advanced technologies to create a 3D module of the cemetery, an artificial intelligence to read and record headstone content, interactive maps, and biographical tributes to Texas A&M veterans. The team also created educational content designed to introduce K 12 students to these technologies with the intent to help students explore STEM career paths early , allowing time to make informed decisions regarding future career opportunities.

Exploring Youths’ Decision To Participate In Stem Afterschool Programs, Brooke M. Stafford, Virginia L. J. Bolshakova

Indiana STEM Education Conference

STEM afterschool programs offer a range of academic, social, and emotional outcomes to support positive youth development. In particular, STEM afterschool programs have been shown to increase student self-efficacy and interest in pursuing STEM careers (Chan et al., 2020; Dabney et al., 2012). Youth must first choose to attend the STEM afterschool programs to gain the many benefits offered. However, participation in such programs decreases as youth get older and encounter additional competing interests (i.e., home responsibilities, jobs, etc.). To get youth to attend, STEM afterschool programs must meet the needs of youth by leveraging resources, activities, and relationships.

This …

Goals And Proceedings Information, Preface And Acknowledgments, William S. Walker Iii, Lynn A. Bryan Ph. D., S. Selcen Guzey, Elizabeth Suazo-Flores

Indiana STEM Education Conference

No abstract provided.

Active Membrane Energy Exchanger For Air Cooling And Dehumidification, Songhao Wu, Andrew Fix, David M. Warsinger, James E. Braun

Discovery Undergraduate Interdisciplinary Research Internship

Heating, ventilation and air conditioning (HVAC) equipment consume 35% of total building energy use in the US, among which a large share is used for cooling and dehumidification. The majority of air dehumidification systems take the conventional approach of moisture condensation removal. It requires air to be cooled below its dew point temperature and is an energy-intensive process, especially for areas with hot and humid climates. Vapor selective membrane systems are promising alternatives for air dehumidification as they do not require cooling energy for latent (humidity) heat removal. It allows water vapor transport through the membrane while blocking air. Previous …

Deep Learning Approach To Improved Image Quality For Medical Diagnostics, Olivia Loesch, Katie Leyba, Halyley Chan, Craig Goergen

Discovery Undergraduate Interdisciplinary Research Internship

The United Nation’s health-related Sustainable Development Goals are difficult to achieve in low- and middle-income countries due to workforce shortages and inadequate health surveillance systems. However, with the growth of artificial intelligence (AI) and computer algorithms, it is possible to apply AI to healthcare technologies to improve progress towards these UN standards. This project aims at using and improving computer algorithms and deep learning to aid in the extraction of important structural and functional information from murine carotid artery ultrasound and photoacoustic images. First, we created a large database of simulated photoacoustic images to optimize the algorithms. These images were …

Undersea Cables: The Ultimate Geopolitical Chokepoint, Bert Chapman

FORCES Initiative: Strategy, Security, and Social Systems

This work provides historical and contemporary overviews of this critical geopolitical problem, describes the policy actors addressing this in the U.S. and selected other countries, and provides maps and information on many undersea cable work routes. These cables are chokepoints with one dictionary defining chokepoints as “a strategic narrow route providing passage through or to another region."

The Three-Year Capstone: A Progression Of Learning In Purdue University’S Theatre Engineering Program, Leigh Witek

Symposium on Education in Entertainment and Engineering

Purdue University’s Theatre Engineering Program capstone combines the yearly production work of the College of Liberal Arts with the final senior design format used in the Colleges of Engineering. By starting their production work after gaining admission to the program, students work on progressively more involved projects throughout their time at Purdue. This poster presentation will examine the lessons learned and challenges faced by Leigh Witek, a recent Theatre Engineering graduate, as she completed each role in the program. She will share how each project informed her understanding of the design process and how a three-year immersion in production work …

Developing Soft Skills With Interdisciplinary Teams In The First Year: Lessons Learned, Christian Rogers

Symposium on Education in Entertainment and Engineering

The academic structure of most universities dictates that a student work with those of their own program and in conjunction with a program that is tangential to theirs. Interdisciplinary educational experiences that provide students with the opportunity to develop soft skills (such as communication, empathy and problem solving) are considered rare but are much more common in the working environment. As an example, working environments such as Universal Creative are comprised of multiple disciplines (i.e. civil engineer, mechanical engineering, illustration, user experience design, etc.) A function of working in an interdisciplinary team can also be to work on unknown or …

Signal Processing Capacity Of The Cellular Sensory Machinery Regulates The Accuracy Of Chemotaxis Under Complex Cues, Hye-Ran Moon, Soutick Saha, Andrew Mugler, Bumsoo Han

Purdue University Libraries Open Access Publishing Fund

Chemotaxis is ubiquitous in many biological processes, but it still remains elusive how cells sense and decipher multiple chemical cues. In this study, we postulate a hypothesis that the chemotactic performance of cells under complex cues is regulated by the signal processing capacity of the cellular sensory machinery. The underlying rationale is that cells in vivo should be able to sense and process multiple chemical cues, whose magnitude and compositions are entangled, to determine their migration direction. We experimentally show that the combination of transforming growth factor-β and epidermal growth factor suppresses the chemotactic performance of cancer cells using independent …

Timing, Latency, And Live Performance, Robert Klimek, Catherine Skokan

Symposium on Education in Entertainment and Engineering

How important is synchronous timing in a performance? In the world of science, engineering and the arts, we cannot avoid it. In the arts, it is a living and vital concept between composer, performer and audience. During the Pandemic, with an increase in virtual meetings and performances, made us more aware of timing issues and introduced us to a path with many questions about latency and affect between audience and performer. The hand waving, head nodding and eye gestures of Renaissance musicians led eventually to the classic conductor’s baton. These all helped ensembles of dissimilar instruments and/or voices, conquer problems …

Catenate: Creating An Interdisciplinary Art Project, Brian Phillips, Melissa Eddings Mancuso, Emma Sherban

Symposium on Education in Entertainment and Engineering

This paper will present the rationale for, the challenges of, and successes encountered in the formation process of an interdisciplinary Visual & Performing Arts Project, Catenate, at Ohio Northern University’s School of Visual & Performing Arts.

Insights From Two Decades Of P-12 Engineering Education Research, Cary I. Sneider, Mihir K. Ravel

Journal of Pre-College Engineering Education Research (J-PEER)

The 21st century has seen a growing movement in the United States towards the adoption of engineering and technology as a complement to science education. Motivated by this shift, this article offers insights into engineering education for grades P-12, based on a landscape review of 263 empirical research studies spanning the two decades from January 2000 to June 2021. These insights are organized around three core themes: (1) students’ understandings, skills, and attitudes about engineering and technology; (2) effective methods of P-12 engineering education; and (3) benefits of P-12 engineering education. The insights are captured in the form of evidence-based …

Analysis Of The Effectiveness Of Face-Coverings On The Death Ratio Of Covid-19 Using Machine Learning, Ali Lafzi, Miad Boodaghi, Siavash Zamani, Niyousha Mohammadshafie, Veeraraghava Raju Hasti

Purdue University Libraries Open Access Publishing Fund

The recent outbreak of the COVID-19 led to death of millions of people worldwide. To stave off the spread of the virus, the authorities in the US employed different strategies, including the mask mandate order issued by the states’ governors. In the current work, we defined a parameter called average death ratio as the monthly average of the number of daily deaths to the monthly average number of daily cases. We utilized survey data to quantify people’s abidance by the mask mandate order. Additionally, we implicitly addressed the extent to which people abide by the mask mandate order, which may …

Research Experiences Instrument: Validation Evidence For An Instrument To Assess The Research Experiences Of Engineering Ph.D. Students’ Professional Practice Opportunities, Eric A. Holloway, Kerrie A. Douglas, David F. Radcliffe, William C. Oakes

School of Mechanical Engineering Faculty Publications

Background. There are long-held concerns about how graduate research programs prepare engineering Ph.D. students for professional practice. Suitable instruments are lacking to effectively assess how research experiences contribute to the success of graduate students becoming professionals.

Purpose. The purpose of this work is to examine evidence of internal reliability and validity of using the Research Experiences Instrument (REI) scores as a measure of engineering Ph.D. students’ professional practice opportunities in their research experiences.

Method. REI was constructed using an ontological framework. REI was administered twice to engineering Ph.D. students, once to a single university (n = 236) and …

A Review Of Mobile Apps For Chronic Kidney Disease Patients, Clarisse Zigan, Carl Russell Iii, Kirsten Wozniak, Kshaunish Soni

The Journal of Purdue Undergraduate Research

No abstract provided.