Omnidirectional retroreflective surface using geodesic polyhedra

Abstract

In this paper, we present the design and analysis of omnidirectional retroreflective surfaces made of trihedral, corner reflectors to enhance the monostatic radar cross section of otherwise low back-scattering surfaces. The proposed designs can be mounted on helmets and used for various applications such as improving the collision avoidance of automotive radar systems in the presence of bicyclists and motorcyclists or improving collision prediction radars in contact sports or other risky environments, where helmets are used. To address these applications, we analyze the coherent response of the proposed designs.

Cervical Muscle Activation Due to an Applied Force in Response to Different Types of Acoustic Warnings

“… 29 There are efforts to instrument helmets with antennas to predict and warn players before a severe collision to help them correct their posture or clench cervical muscles before the injurious perturbation. 32 , 37 Scenarios that can result in a neck injury can also have both audible and visual cues present, 37 causing either an involuntary or voluntary muscular response. The level of muscle activity and resulting kinematic response from a whiplash-like perturbation are different depending on the type of a priori knowledge provided to participants.…”