The condition for dynamic stability

(1990). ENERGY FUNCTION ANALYSIS FOR POWER SYSTEM STABILITY. Electric Machines & Power Systems: Vol. 18, No. 2, pp. 209-210.

Energy function analysis for power system stability

Falls in older people: risk factors and strategies for prevention.

Sources of Power: How People Make Decisions

Gait Analysis. An Introduction

A process of determining whether two or more bodies are making contact at one or more points is called collision detection or intersection detection Collision detection is inseparable part of the computer graphics, surgical simulations, and robotics There are varieties of methods for collision detection We will review some of the most common ones Algorithms for contact determination can be grouped into two general parts: broad-phase and narrow-phase This paper provides a comprehensive classification of a collision detection literature into the two phases Moreover, we have attempted to explain some of the existing algorithms which are not easy to interpret Also, we have tried to keep sections self-explanatory without sacrificing depth of coverage

Collision detection: A survey

Simulated movement termination for balance recovery: can movement strategies be sought to maintain stability in the presence of slipping or forced sliding?

Human upright posture is inherently unstable. To counter the mechanical effect of a large-scale perturbation such as a slip, the CNS can make adaptive adjustments in advance to improve the stability of the body center-of-mass (COM) state (i.e., its velocity and position). Such feedforward control relies on an accurate internal representation of stability limits, which must be a function of anatomical, physiological, and environmental constraints and thus should be computationally deducible based on physical laws of motion. We combined an empirical approach with mathematical modeling to verify the hypothesis that an adaptive improvement in feedforward control of COM stability correlated with a subsequent reduction in balance loss. Forty-one older adults experienced a slip during a sit-to-stand task in a block of slip trials, followed by a block of nonslip trials and a re-slip trial. Their feedforward control of COM stability was quantified as the shortest distance between its state measured at seat-off (slip onset) and the mathematically predicted feasible stability region boundary. With adaptation to repeated slips, older adults were able to exponentially reduce their incidence of falls and backward balance loss, attributable significantly to their improvement in feedforward control of stability. With exposure to slip and nonslip conditions, subjects began to select "optimal" movements that improved stability under both conditions, reducing the reliance on prior knowledge of forthcoming perturbations. These results can be fully accounted for when we assume that an internal representation of the COM stability limits guides the adaptive improvements in the feedforward control of stability.

https://www.physiology.org/doi/pdf/10.1152/jn.01118.2002

Role of Feedforward Control of Movement Stability in Reducing Slip-Related Balance Loss and Falls Among Older Adults

Predicted region of stability for balance recovery: motion at the knee joint can improve termination of forward movement.

Thresholds for step initiation induced by support-surface translation: a dynamic center-of-mass model provides much better prediction than a static model.

Kamran Iqbal

Papers

Collision detection: A survey

Simulated movement termination for balance recovery: can movement strategies be sought to maintain stability in the presence of slipping or forced sliding?

Role of Feedforward Control of Movement Stability in Reducing Slip-Related Balance Loss and Falls Among Older Adults

Predicted region of stability for balance recovery: motion at the knee joint can improve termination of forward movement.

Thresholds for step initiation induced by support-surface translation: a dynamic center-of-mass model provides much better prediction than a static model.