Fall events in elderly populations often result serious injury and may lead to long-term disability and/or death. While many fall detection systems have been developed using wearable sensors distinguish falls from other daily activities, sensitivity specificity decreases when exposed more rigorous activities such as running jumping. This research uses time-frequency analysis of accelerometer-on...

In a recent paper [1], Drs Selby and Miller described three methods of determining the fracture toughness (R), or equivalently, the fracture surface energy (23') for an epoxy resin. These methods are respectively (a) Berry's method, (b) Irwin-Kies equation and (c) Gurney's irreversible work area method. While the experimental data obtained from tapered double-cantilever beam (TDCB) specimens su...

An integer sequence a(n) is called a jump sequence if a(1) = 1 and 1 ≤ a(n) < n for n ≥ 2. Such a sequence has the property that ak(n) = a(a(· · · (a(n)) · · · )) goes to 1 in finitely many steps. We call the pattern (n, a(n), a2(n), . . . , al(n) = 1) a jumping pattern from n down to 1. In this paper we look at jumping sequences that are weight minimizing with respect to various weight functio...