Tie a trefoil knot in a piece of string, seal the ends together, and try to wiggle it free without cutting. In three-dimensional space, the knot holds firm. Add a fourth spatial dimension, however, ...

Abstract: Osteoarthritis (OA) of the knee is a leading cause of joint pain and mobility loss. Early diagnosis is crucial for effective management yet remains challenging with traditional imaging ...

Abstract: To improve the estimation accuracy of two-dimensional (2D) direction-of-arrival (DOA) of uniform rectangular array, and increase the degrees of freedom of the array, this paper proposes a ...