Rollating walkers are popular mobility aids used by older adults to improve balance control. There is a need to automatically recognize the activities performed by walker users to better understand activity patterns, mobility issues and the context in which falls are more likely to happen. We design and compare several techniques to recognize walker related activities. A comprehensive evaluatio...

A pH responsive DNA walker has been designed. The walker can reversibly transport specific molecules along an assembled track under environmental stimuli.

Genusa Walker, 1855, a genus currently included in the Hypochrosini, was originally established in the Lymantriidae, and transferred to the Geometridae by Hampson (1895), who designated G. bigutta Walker, 1855 as the type species, and listed G. destituta Walker, 1865, originally described from Cambodia, as a synonym of G. bigutta, though without any explanation. The only literature which compar...

A nice feature of this strategy is that it automatically increases robustness. Assume that a disturbance puts the walker in a state x∗ dist . If x ∗ dist ∈ BOA(θ), it is no problem; the walker will automatically converge back to its limit cycle again. If x∗ dist 6∈ BOA(θ), then, using the same strategy, a temporary θtemp ∈ Θ(x∗ dist) can be chosen which is close to the original θ but does not m...

It is generally believed that the mitochondrial genome is inherited from a single parent in animals and higher plants and that the inheritance of mitochondrial DNA (mtDNA) is therefore clonal (Birky 1995). However, the clonality of human mtDNA has recently been questioned (Awadalla, Eyre-Walker, and Maynard Smith 1999; Eyre-Walker, Smith, and Maynard Smith 1999a; Hagelberg et al. 1999) and keen...

BACKGROUND With ageing populations worldwide, mobility devices are used more than ever. In the current literature there is no consensus whether the available mobility devices safely improve the mobility of their users. Also, evidence is lacking concerning the risks and types of injuries sustained while using a four-wheeled walker. OBJECTIVE To assess injury risks and injury patterns in older ...