Introduction Stair falls can be caused by inconsistent stair dimensions. During ascent, inconsistently taller risers lead to reduced foot clearances as the inconsistency goes unnoticed. A horizontal-vertical illusion increases perceived riser heights and clearance could offset over risers, though this might impact other safety measures. Method Twelve participants (age: 22 (3) years) ascended a ...

This paper focuses on the stair-climbing problem for a tracked robot. The tracked robot designed in this paper has the ability to explore stairs in an unknown indoor environment, climbing up and down the stairs, keeping balance while climbing, and successfully landing on the stair platform. Intelligent algorithms are proposed to explore and align stairs, and a fuzzy controller is introduced to ...

This paper deals with a new up-stair motion planning algorithm for a biped robot. The whole body of the humanoid can be visualized as a kinematically redundant robot, where the number of joints are more that the required degree of freedom. Based on the ZMP constraint equation, a sequential redundancy resolution algorithm is proposed, which ensures the ZMP trajectory, the planned operational mot...

The STanford Artificial Intelligence Robot (STAIR) project is a long-term group effort aimed at producing a viable home and office assistant robot. As a small concrete step towards this goal, we showed a demonstration video at the 2007 AAAI Mobile Robot Exhibition of the STAIR 1 robot responding to a verbal command to fetch an item. Carrying out this task involved the integration of multiple co...

In array antennas, the shaped beams are produced either by amplitude control or phase control. In the present work, an attempt is made to produce them with the introduction of new aperture distribution without additional phase. Stair-step patterns are produced using Fourier transform method after introducing the proposed aperture distribution. The computed patterns are presented. These patterns...

In this paper, getting an high-efficiency parallel algorithm to solve sparse block pentadiagonal linear systems suitable for vectors and parallel processors, stair matrices are used to construct some parallel polynomial approximate inverse preconditioners. These preconditioners are appropriate when the desired target is to maximize parallelism. Moreover, some theoretical results about these pre...

Effects of stair gradients and obesity on walking speeds on stairs were empirically investigated. The participants included a group of elderly people (n=18) and a group of young people (n=15). They were asked to ascend/descend four staircases with different gradients, as well as to walk on a flat surface, at both normal and fast speeds. The study found the effects of stair gradients. When walki...