Regulatory Mechanisms in Biosystems (E-Journal - Dnipro National University)
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The effect of backpack load on gait biomechanics in college-aged individuals
No full textA Thesis Submitted In Partial Fulfillment of the Requirements for the Degree of MASTER OF SCIENCE in Kinesiology from Texas A&M University-Corpus Christi.The aim of this study was to investigate the effects of backpack load carriage on gait and lower extremity biomechanics in healthy college-aged students. A total of 14 participants completed gait trials while walking carrying a backpack weighing 20% of their body weight and without a backpack. The kinematics, kinetics, and spatiotemporal parameters of gait were analyzed under both unloaded and loaded conditions. The results of the study showed that load carriage had a significant impact on several kinematic variables. Participants exhibited a decrease in hip flexion range of motion and knee flexion and extension peak velocities when carrying a load. This suggests that load carriage alters the normal movement patterns of the lower extremities during the gait cycle. Additionally, several gait kinetic variables were found to be significantly different between the unloaded and loaded conditions, including mean peak vertical force, mean peak mediolateral force, mean peak propulsion, mean peak brake, hip flexion peak moment, and ankle plantar flexion peak moment. These results indicate that load carriage not only affects the movement patterns of the lower extremities but also alters the forces acting on the body during walking. The findings of this study are consistent with previous research and suggest that load carriage should be considered when choosing a backpack or occupational tasks that involve load carriage. However, it is important to note that the effect of load carriage on gait biomechanics may depend on several factors, such as the weight and distribution of the load. The limitations of this study included the backpack weight being too heavy for some participants, leading to discomfort in their shoulders, and the inability to increase the weight of the load for safety reasons. Future studies could investigate these factors and explore optimal load carriage conditions. In conclusion, this study provides valuable insights into backpack load carriage on gait biomechanics in college-aged adults. The findings suggest that load carriage significantly alters gait patterns and should be taken into consideration when selecting a backpack or when involved in occupational tasks that require load carriage.KinesiologyCollege of Scienc
Encrypted observer-based control for linear continuous-time systems
No full textThis paper is concerned with the stability analysis of encrypted observer-based control for linear continuous-time systems. Since conventional encryption has limited ability to de ploy in continuous-time integral computation, our work presents systematically a new design of encryption for a continuous-time observer-based control scheme. To be specific, in this paper, both control parameters and signals are encrypted by the learning with-errors (LWE) encryption to avoid data eavesdropping. Furthermore, we propose encrypted computations for the observer based controller based on its discrete-time model, and present a continuous-time virtual dynamics of the controller for further stability analysis. Accordingly, we present novel stability criteria by introducing linear matrix inequalities (LMIs)-based conditions associated with quantization gains and sampling intervals. The established stability criteria with theoretical proofs based on a discontinuous Lyapunov functional possibly provide a way to select quantization gains and sampling intervals to guarantee the stability of the closed-loop system. Numerical results on DC motor control corresponding to several quantization gains and sampling intervals demonstrate the validity of our method.This paper is concerned with the stability analysis of encrypted observer-based control for linear continuous-time systems. Since conventional encryption has limited ability to de ploy in continuous-time integral computation, our work presents systematically a new design of encryption for a continuous-time observer-based control scheme. To be specific, in this paper, both control parameters and signals are encrypted by the learning with-errors (LWE) encryption to avoid data eavesdropping. Furthermore, we propose encrypted computations for the observer based controller based on its discrete-time model, and present a continuous-time virtual dynamics of the controller for further stability analysis. Accordingly, we present novel stability criteria by introducing linear matrix inequalities (LMIs)-based conditions associated with quantization gains and sampling intervals. The established stability criteria with theoretical proofs based on a discontinuous Lyapunov functional possibly provide a way to select quantization gains and sampling intervals to guarantee the stability of the closed-loop system. Numerical results on DC motor control corresponding to several quantization gains and sampling intervals demonstrate the validity of our method
Topic 4.3: Useful Java classes
No full textIn this module, you will learn about:
Useful Java Classes,
Object Class,
String Class,
Math Class,
Integer Class,
Syste
Mexican American Women's Auxiliary
No full textMexican American Women's Auxiliary to Woodmen of the World Group Pictur
Sammie and Ralph Galvan, WWII
No full textSammie and Ralph Galvan smiling for a picture togeather during WWI
A comparison of hydraulic patent tongs and oyster dredges for monitoring oyster reefs in the mission - Aransas estuary
No full textA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Marine BiologyThe Texas Parks and Wildlife Department (TPWD) currently uses dredge sampling to monitor oyster reefs open to commercial harvest. However, dredges have been shown to produce biased sampling data with regard to the density and relative sizes of the oysters collected. In this project, we compared the sampling performance of oyster dredges in reference to hydraulic (patent) oyster tongs. The objectives of this project were to: (1) Compare the density (n m-2) and size (shell height, mm) of live oysters, articulated shells of dead oysters (boxes), and disarticulated oyster shells collected using dredges and tongs across varying reef structures (assessed with acoustic mapping procedures). (2) Compare dredge vs. tong-generated metrics and evaluate resulting thresholds for opening and closing oyster harvest areas. (3) Compare the logistics of dredge versus tong sampling methods for oyster monitoring (e.g., cost, gear maintenance and operation, impacts on staff-hours). Results indicate that dredges show a size bias toward larger shells and oysters, while tongs sample a smaller area and may not accurately represent density across the entire reef extent, particularly for reefs with patchy oyster distribution and where sample size is not adequate. Although deployment, retrieval, and processing for one tong sample takes less time than for one dredge sample, tong sampling requires one additional staff member and approximately 2-3x more samples to see stabilized estimates of density, compared to dredge sampling. Based on this study, tongs may be better suited for more focused (spatially or temporally) sampling initiatives where a greater number of samples and staff time are more realistic. This is the first tong and dredge comparison in Texas estuaries that focuses on monitoring commercially harvested oyster reefs and understanding the ability of tongs and dredges to provide management metrics across a range of reef types and oyster abundances.Marine BiologyCollege of Scienc
Identification of brush species and herbicide effect assessment in Southern Texas using an Unoccupied Aerial System (UAS)
No full textCultivation and grazing since the mid-nineteenth century in Texas has caused dramatic changes in grassland vegetation. Among these changes is the encroachment of native and introduced brush species. The distribution and quantity of brush can affect livestock production and water holding capacity of soil. Still, at the same time, brush can improve carbon sequestration and enhance agritourism and real estate value. The accurate identification of brush species and their distribution over large land tracts are important in developing brush management plans which may include herbicide application decisions. Near-real-time imaging and analyses of brush using an Unoccupied Aerial System (UAS) is a powerful tool to achieve such tasks. The use of multispectral imagery collected by a UAS to estimate the efficacy of herbicide treatment on noxious brush has not been evaluated previously. There has been no previous comparison of band combinations and pixel and object-based methods to determine the best methodology for discrimination and classification of noxious brush species with Random Forest (RF) classification. In this study, two rangelands in southern Texas with encroachment of huisache (Vachellia farnesianna [L.]Wight & Arn.) and honey mesquite (Prosopis glandulosa Torr. var. glandulosa) were studied. Two study sites were flown with an eBee X fixed-wing to collect UAS images with four bands (Green, Red, Red-Edge, and Near-infrared) and ground truth data points pre- and post-herbicide application to study the herbicide effect on brush. Post-herbicide data were collected one year after herbicide application. Pixel-based and object-based RF classifications were used to identify brush in orthomosaic images generated from UAS images. The classification had an overall accuracy in the range 83–96%, and object-based classification had better results than pixel-based classification since object-based classification had the highest overall accuracy in both sites at 96%. The UAS image was useful for assessing herbicide efficacy by calculating canopy change after herbicide treatment. Different effects of herbicides and application rates on brush defoliation were measured by comparing canopy change in herbicide treatment zones. UAS-derived multispectral imagery can be used to identify brush species in rangelands and aid in objectively assessing the herbicide effect on brush encroachment.This graduate research study was funded by the Department of Soil & Crop Sciences at Texas A&M University, College Station, TX, USA
