Gait is influenced by many factors, but one of the most prominent ones is shoe heel height. Optical motion tracking technology is widely used to analyze high-heeled gait, but it normally involves several high-quality cameras and licensed software, so clinics and researchers with low budgets cannot afford them. This article presents a simple, effective technique to measure the rotation angles on the sagittal plane of the ankle (tibiotalar) and toe (metatarsophalangeal) joints when no shoes (0 cm heel) and high-heeled shoes (2, 6 and 10 cm heels) are worn. The foot’s position was determined by a set of equations based on its geometry and video analysis techniques with free software (Tracker). An evaluation of the spatio-temporal variables confirmed observations from previous studies: increasing heel heights reduces gait cycle length and speed but does not change cadence. The range of movement at the tibiotalar joint progressively narrowed from 28° when no heel height was worn to 9° when a 10 cm heel was used, and these reductions ranged from 30° to 5° for metatarsophalangeal joints, respectively. This aligns with other authors’ previous studies, and confirms that the proposed method accurately measures kinematic ankle–foot set changes when wearing high heels.
La aplicación de enfoques de toma de decisión basados en el monitoreo de la degradación de los sistemas a situaciones reales presenta un grupo de barreras tales como la complejidad de los métodos, la disponibilidad de datos, tecnología y personal capacitado. En este trabajo se propone una vía para el monitoreo del estado del vehículo de transporte de cargas a través de la disponibilidad. Para ello se introduce la condición límite de uso racional de los vehículos y se presenta la expresión de la disponibilidad límite vinculada a los resultados económicos de la operación del vehículo, lo que posibilita valorar la conveniencia de la operación del mismo. La aplicación de la propuesta a una flota ilustra sus posibilidades en condiciones reales, obteniéndose un grado de acuerdo "Casi perfecto" entre los resultados del análisis de la disponibilidad y el resultado económico de la operación del vehículo.
Companies operating transportation fleets can participate indistinctly in the roles of logistics operator and marketer in the supply chain. The objective of this study is to propose the vehicles degradation monitoring in a company which takes part with a combination of roles in the supply chain, thru the availability indicator, a control limit based on the impacts on the economic result of the vehicles operation and considering the subcontracting influence. This proposal permits to identify the vehicles that impact positively or negatively on the entity economic result and thus the detection of opportunities for improvement. The classification of the impact of the vehicle is done by the graphical method through the Rationality Status Chart. The proposal application to a real fleet allowed to identify the vehicles that negatively impact the economic results. Concordance analysis is used to validate the results, obtaining an almost perfect degree of general agreement.
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