This paper presents a novel design of a full six-degree-of-freedom, tri-rotor-actuated single-wheeled vehicle. When stationary on the ground, the model of the vehicle mimics an inverted pendulum system, a typical representative of highly nonlinear systems with non-minimum phase and unstable characteristics. The full nonlinear model of the vehicle is derived using Newton-Euler approach, but the ...

Axial twisting of the torso has been identified via epidemiologic studies as a significant risk factor for occupationally-related low back disorders. However, only recently have biomechanical studies been able to describe how twisting is accomplished through the use of the trunk musculature. These studies have been performed on subjects whose torso twists were performed in an upright posture. I...

BACKGROUND Men and women differ in the risk of cardiovascular disease, but the underlying mechanisms are not completely understood. We examined possible sex-related differences in supine and upright cardiovascular regulation. METHODS AND RESULTS Hemodynamics were recorded from 167 men and 167 women of matching age (≈45 years) and body mass index (≈26.5) during passive head-up tilt. None had d...

this paper proposes an approach for the minimum time swing upof a rotary inverted pendulum. our rotary inverted pendulum is supported bya pivot arm. the pivot arm rotates in a horizontal plane by means of a servomotor. the opposite end of the arm is instrumented with a joint whose axisis along the radial direction of the motor. a pendulum is suspended at thejoint. the task is to design a contro...

Background: According to studies, despite the proven and effective role of mechanical ventilation on patients with respiratory failure, the positive effects of semi-upright position on oxygenation and ventilation of patients under mechanical ventilation and nurses’ training about them have been neglected. This study aimed to investigate the effect of outcome-based education of nurses on m...

Observers misperceive the orientation of a vertical rod when it is viewed in the context of a tilted frame (the rod and frame illusion, or RFI). The pitch and roll of the surrounding surfaces have independent influences on this illusion (Nelson and Prinzmetal, 2003). Experiment 1 measured the RFI when the pitch and roll of the floor that supported the observer was varied, and the observer was e...

incapability in face perception and recognition is one of the main issues in autism spectrum disorders (asd). event related potential (erp) studies have revealed controversial insights on autistic brain responses to faces and objects. the current investigation examined the erp components of young children with asd compared to a typically developing (td) group when looking at the upright and inv...

What do infants learn when they learn to sit upright? We tested behavioral flexibility in learning to sit-the ability to adapt posture to changes in the environment-in 6- to 9-month-old infants sitting on forward and backward slopes. Infants began with slant at 0°; then slant increased in 2° increments until infants lost balance. Infants kept balance on impressively steep slopes, especially in ...

The ability to rise from a chair is a prerequisite for upright mobility and independent living. We are developing an inexpensive stereo based system capable of cheaply and automatically assessing the quality of “sit-tostand” movements in environments outside of clinics. Automated assessments have been designed to translate perceived kinematics onto assessment scores that are consistent with exp...