Determining risk to human populations due to natural disasters has been a topic of interest in the STEM fields for centuries. Earthquakes and the tsunamis they cause are of particular interest due to their repetition cycles. These cycles can last hundreds of years but we have only had modern measuring instruments for the last century or so which makes analysis difficult. In this document, we explore ways to improve upon an existing method for reconstructing earthquakes from historical accounts of tsunamis. This method was designed and implemented by Jared P Whitehead's research group over the last 5 years. The issue of this method that we address is the relatively slow convergence. One reason for this slow convergence is caused by the random walk proposal step in the Markov Chain Monte Carlo (MCMC) sampling. We explore ways of constructing an approximate gradient of the model in order to apply a more robust MCMC Method called MALA that uses a gradient combined with some randomness to propose new samples. The types of approximate gradients we explore were a heuristic gradient, a data driven gradient and a gradient of a surrogate model. We chose to use the gradient of a simplified tsunami formula for our implementation. Our MALA algorithm under performed the previous random walk method which we believe implies that the simplified tsunami model didn't give sufficient information to guide the proposed samples in the optimal direction. Further experimentation would be needed to confirm this and we are confident that there are other ways we can improve our convergence as specified in the future work section. Our method is built into the existing Python package tsunamibayes. It is available, open-source, on GitHub: https://github.com/jwp37/tsunamibayes.

TCP can perform poorly in multi-hop wireless networks due to problems with contention and poor feedback from end-to-end control algorithms. This thesis explores the design of a hop-by-hop transport protocol (HxH). By allowing intermediate nodes to actively participate, the protocol can respond more quickly to changing network conditions and exploit the unique characteristics of wireless networks. Results indicate that hop-by-hop transport can achieve throughput rates that are double those of TCP, depending on the speed of the wireless links.

Globalization is a rapidly increasing trend in many industries, including civil engineering. This paper defines the skills engineers will need in an increasingly international industry. It also describes an engineering study abroad program designed to teach some of those skills to students and presents a survey used as an assessment tool to evaluate the effectiveness of the program. The program, called Mexico Engineering Study Abroad (MESA), is taught at Brigham Young University (BYU) in Provo, UT. MESA is a project-based extended field trip format class that couples hydrologic modeling with cultural awareness as students work together with Mexican students on water resources modeling projects in Mexico. The aforementioned survey shows that MESA affects a positive change in the student development and importance of global engineering skills such as leadership, teamwork, cultural sensitivity, and language. The importance of these skills in the workplace was also measured. The data shows that MESA is effective at developing global engineering skills in students. The data also suggest that other schools could use MESA as a model for their own efforts to prepare students for a more global industry. They show that non-technical skills can be measured and the results used to improve the course and the assessment methods. In particular, the MESA course could be improved by involving more faculty and increasing parity between the BYU and Mexican experiences in the course. The survey can be improved by conducting pre-class and post-class surveys instead of just one post-class survey. A special effort should be made to develop symmetry of experience for Mexican and BYU students, including extending the survey to the Mexican students.

As technology advances and engineering capabilities improve, more research has focused on microscopic possibilities. Microelectromechanical systems (MEMS) is one area that has received much attention recently. Within MEMS much research has focused on sensing and actuation. This thesis presents work on a particular actuator of interest, the thermomechanical in-plane microactuator (TIM). Recent work has shown the possibility of a novel approach of sensing mechanical outputs of the TIM without ancillary sensors. This sensing approach exploits the piezoresistive property of silicon. However, to implement this approach a full model of the TIM would need to be obtained to describe the physics of the TIM, as well as development of a calibration approach to account for variations between devices. This thesis develops a multi-physics model of the TIM to realize this sensing approach. This model determines the mechanical state of the TIM using the same electrical signal that actuates the TIM. In this way the TIM is able to operate as a self-sensing actuator. To allow this multi-physics model to be tractable, work was done to simplify the thermal modeling of the TIM. A preliminary calibration approach was developed to adequately compensate for variations between devices. Thermal modeling and calibration were coupled with mechanical modeling and a developed sensing approach to form the full multi-physics model of the TIM. Validation testing of the model was performed with a modified calibration approach which showed good correlation with experimental data.

Since MIT launched the first OpenCourseWare (OCW) initiative in 2002, responses from the academic community have ranged from exuberance to angst. Some institutions have been reluctant to adopt a program of open publishing because of concerns about long-term funding and possible adverse effects on paid enrollment. Money is an issue, forcing some organizations that initially created OCW programs to furlough them due to funding challenges. This study examined the cost of converting online distance learning courses to OCW, the impact of opening these courses on paid enrollments, and the long-term sustainability of OCW through the generation of new paid enrollments. As part of this study, Brigham Young University's Independent Study Program (BYU IS) converted three university and three high school courses to OCW. BYU IS provided an option for OCW users to pay regular tuition and enroll in the online course for credit. The average ongoing cost to convert BYU IS courses to OCW was $284.12 per university course and $1,172.71 per high school course. The six opened courses generated 13,795 visits and 445 total paid enrollments in four months. The profit margin on the paid enrollments OCW generated was calculated to be 3.81% for open publishing to be financially self-sustaining at BYU Independent Study.

Congestion control algorithms for wireless networks are often designed based on a model of the wireless network and its corresponding network utility maximization (NUM) problem. The NUM problem is important to researchers and industry because the wireless medium is a scarce resource, and currently operating protocols such as 802.11 often result in extremely unfair allocation of data rates. The NUM approach offers a systematic framework to build rate control protocols that guarantee fair, optimal rates. However, classical models used with the NUM approach do not incorporate partial carrier sensing and interference, which can lead to significantly suboptimal performance when actually deployed. We quantify the potential performance loss of the classical controllers by developing a new model for wireless networks, called the first-principles model, that accounts for partial carrier sensing and interference. The first-principles model reduces to the classical models precisely when these partial effects are ignored. Because the classical models can only describe a subset of the topologies described by the first-principles model, the score for the first-principles model gives an upper bound on the performance of the others. This gives us a systematic tool to determine when the classical controllers perform well and when they do not. We construct several representative topologies and report numerical results on the scores obtained by each controller and the first-principles optimal score.

Space-based computing applications often demand reliable, high-bandwidth communication systems. FPGAs with Mulit-Gigabit Transceivers (MGTs) provide an effective platform for such systems, but it is important that system designers understand the possible susceptibilities MGTs present to the system. Previous work has provided a foundation for understanding the susceptibility of raw FPGA MGTs but has fallen short of testing MGTs as part of a larger system. This work focuses on answering the questions MGT system designers need to know in order to build a reliable space-based MGT system. Two radiation tests were performed with a test architecture built on the Aurora protocol. These tests were specifically designed to discover system susceptibilities, and effective mechanisms for upset detection, recovery, and recovery detection. Test results reveal that the Aurora protocol serves as an effective basis for simple point-to-point communication for space-based systems but that some additional logic is necessary for high reliability. Particularly, additional upset detection and recovery mechanisms are necessary as well as additional status indicators. These additions are minimal, however, and not all are necessary depending on system requirements. The most susceptible part of the MGT system is the MGT tile components on the RX data path. Upsets to these components most often results in data corruption only and do not affect system operation or disrupt the communication link. Most other upsets which do disrupt normal system operation can be recovered automatically by the Aurora protocol with built-in mechanisms. Only 1% of observed events in testing required additional recovery mechanisms not supplied by Aurora. In addition to test data results, this work also provides suggestions for system designers based on various system requirements and a proposed MGT system design based on the Aurora protocol. The proposed system serves as an example to illustrate how test data can be used to guide the system design and determine system availability. With this knowledge designers are able to build reliable MGT systems for a variety of space-based systems.

This work has extended an existing Aurora protocol for high-speed serial I/O between FPGAs to provide greater fault recovery in the presence of high-energy radiation. To improve on the Aurora protocol, additional resets that affect larger portions of the system were used. Detection for additional error modes that occurred but were not detected by the Aurora protocol was designed. Radiation testing was performed on the Aurora protocol with the additional mitigation hardware. The test gathered large amounts of data on the various error modes of the Aurora protocol and how the additional mitigation circuitry affected the system. The test results showed that the addition of the recovery circuitry greatly enhanced the Aurora protocol's ability to recover from errors. The recovery circuit recovered from all but 0.01% of errors that the Aurora protocol could not. The recovery circuit further increased the availability of the transmission link by proactively applying resets at much shorter intervals than used in previous testing. This quick recovery caused the recovery mechanism to fix some errors that may have recovered automatically with enough time. However, the system still showed an increase in performance, and unrecoverable errors were reduced 100x. The estimated unrecoverable error rate of the system is 5.9E-07 in geosynchronous orbit. The bit error rate of the enhanced system was 8.47754E-015, an order of magnitude improvement.

A healthy civil society depends on citizens who have mature critical thinking skills and a willingness to entertain opposing points of view. The development of critical thinking in young adults has long been studied, but there has been little agreement on what the attributes of critical thinking are and how to reliably assess them. While many studies have attempted to assess the critical thinking abilities of college students, none have yet measured critical thinking through using the Critical Thinking Analytic Rubric (CTAR) to assess first-year college students' writing. This study used a modified version of the CTAR rubric to investigate students' critical thinking in writing completed for an American Heritage course. Four hypotheses were tested: (1) that raters would use the rubric with high inter-rater reliability estimates; (2) that there would be a significant relationship between the scores from the earlier holistic rubric used in the 2015 Hansen et al. study and the scores from the analytic rubric used in this study; (3) that there would be a significant relationship between analytic scores and ACT and GPA scores; (4) that there would be a significant relationship between essay score and gender. Findings included the following: (1) The inter-rater reliability for the overall scores of the papers was 0.898, which exceeds the 0.70 acceptable level. However, the inter-rater reliability for sub-scores was negative and required further investigation. (2) There was no significant relationship between the scores of the Hansen et al. study and this study. (3) There was no significant relationship between essay scores and ACT and GPA scores. (4) There was a significant relationship between essay scores and gender, with female students scoring higher than male students.

This paper presents a two-level morphological description of Tagalog for use in PC-Kimmo and a mechanism created for updating the results output from PC-Kimmo in order to meet the standards for current database and natural language processing applications. There are two main research tasks presented in this paper which constituted this project. First, a complete morphological engine for Tagalog is presented. Next, a tool is introduced that takes the morphological engine output and stores it in XML format.