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Browsing by Author "Morris, Kristen, committee member"

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    Analysis of 3D facial anthropometric measurements for respirator fit outcomes
    (Colorado State University. Libraries, 2023) Hobbs-Murphy, Kayna, author; Rosecrance, John, advisor; Brazile, Bill, committee member; Anderson, Brooke, committee member; Morris, Kristen, committee member; Hess, Ann, committee member
    Anthropometry is central to the development of efficacious products and environments (i.e., personal protective equipment, clothing, sunglasses, chairs, interior spaces, etc.) used by humans. Three-dimensional (3D) scanning is increasingly common for collecting anthropometric data, as it is faster and less intrusive than traditional manual methods. Additionally, 3D anthropometric methods used to derive facial dimensions provide greater contextual application in the development of respirators and facemasks. More than 2,000 3D facial scans were analyzed to assess measurement reliability and the dimensions of 27 facial features. This research represents the largest sample of 3D facial anthropometrics assessed to date. The three specific aims of the research included: 1) to assess the intra- and inter-rater reliability of 3D facial measurement methods, 2) to compare the 3D facial anthropometric summary statistics from the present study to relevant summary statistics from manual facial measurements found in the literature, and 3) to assess the presence of differences in 3D facial anthropometrics related to respirator fit, based on demographic factors of gender, race/ethnicity, and age. Post hoc analyses were completed to quantify 3D facial measurement differences between demographic groups (within the larger demographic categories of gender, race/ethnicity, and age group). The most notable results of this research include a) high reliability in 3D measurement data collection methods, b) differences in measurement data summary statistics between 3D and manual methods, and c) significant differences in facial measurements between demographic categories of gender (Male and Female/Other), race/ethnicity (White, Black, LatinX, Asian, and Other), and age (18-34, 35-54, and 55-72).
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    Development and characterizations of mycelium-based composites
    (Colorado State University. Libraries, 2024) Davis, Morgan N., author; Li, Yan Vivian, advisor; Morris, Kristen, committee member; Stewart, Jane, committee member
    The current materials economy produces linear materials without regard to their end of life. As the demand for these materials rises, the demand for a new textile economy increases: regenerative by design, minimizing resource input, and waste systems. Mycelium-based composites (MBC) is a lightweight biodegradable material, with good thermal insulation, fire resistance, and acoustic attenuation. The role of MBC lies at a crossroads between biology and design, where designers incorporate biological principles and need to understand the mechanisms of material growth. The study's specific aims include the evaluation of the chemical, mechanical, and physical properties of MBC developed in various conditions and nutrient substrates. Essential to this process is the cultivation of the mycelium, where careful considerations of fungal species, nutrient substrate, and growing parameters are critical. A component of the first critical factor emerges: verification of the fungal DNA. The nutrient substrate hemp fabric demonstrates great compatibility, with the fungal species Pleurotus fossulatus, as it has the largest hyphae diameter, and offers solutions to incorporate waste. In contrast to the strong hydrophilic nature inherent in many natural cellose, mycelium exhibits hydrophobic properties, a critical feature in terms of product implication. The results provide insight for the future design and optimization of mycelium-based composites for product development innovation.
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    ItemOpen Access
    Musculoskeletal disorder symptom prevalence among construction workers
    (Colorado State University. Libraries, 2022) Townsend, Kelsey, author; Rosecrance, John, advisor; Brazile, Bill, committee member; Morris, Kristen, committee member
    Introduction: Musculoskeletal disorder (MSD) symptoms among construction workers have direct impact on their work ability and quality of life. Understanding self-reported MSD symptoms and their association with work tasks may assist in the identification of interventions to reduce their occurrence. The purpose of this descriptive study was to assess MSD symptom prevalence and job factors that may be associated with symptoms among a sample of 104 construction workers (plumbers and pipefitters) in the San Jose region of California. Methods: A self-administered survey, which was used with several other cohorts (including within construction trades) by a variety of investigators, was distributed to 104 plumbers and pipefitters at a local union meeting. The survey assessed demographic characteristics, work-related MSD symptom history in the previous 12-months and job factors which may contribute to MSD symptoms. Results: The mean age of the participating workers was 48. The top four body regions reported to have MSD symptoms were the low back, the shoulders, the neck, and the knees. Low back pain was associated with the job factor bending or twisting the back in an awkward way. Shoulder pain was associated with reaching or working overhead or away from the body. Neck pain was associated with working in cramped or awkward positions. Significance: Based on these analyses, a prioritization of resources that focus on the anatomical areas most likely to be injured as well as the job factors that contribute to the MSD symptoms in specific construction work may assist in injury prevention.