The aim of this study was to compare the effects of grab rail position, orientation, and number of hands used on the kinetics of assisted sit-to-stand transfers. Participants were 12 able-bodied older adults between the ages of 69 and 88 years. While each one performed the sit-to-stand transfer, a motion analysis system with 9 cameras recording at 60 Hz tracked the 3-D trajectories of retrorefl...

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We report on some recent advancements on the development of the ROADRUNNER system, which is able to automatically infer a wrapper for HTML pages. One of the major drawbacks of the ROADRUNNER approach was its limited ability in handling irregularities in the source pages. To overcome this issue, we have developed a technique to deal with chunks of unstructured HTML code. Several experiments have...

(1.2) \D[zu ..., zn ; B(x, r)]\ > c2(K, e). n < Note that the exponent {\ — (1/2K) e) of n is essentially the best possible: (2 — (1/2K) e) cannot be replaced by the exponent (2 — (1/2K) + e) with e > 0. Note further that (1.1) or (1.2) above guarantees the existence of a ball in U with 'error' very large as compared to that of boxes in U with sides parallel to the axes. We recall that in 1954 ...

High speed trains are currently meant to run faster and to carry heavier loads, while being less energy consuming and still respecting the security and comfort certification criteria. To face these challenges, a better understanding of the interaction between the dynamic train behavior and the track geometry is needed. As during its lifecycle, the train faces a great variability of track condit...

This paper presents a methodology to build representative railway track geometries thanks to a stochastic modelling. This modelling, which has to integrate the statistical and spatial variabilities and dependencies, is a key issue when using simulation for conception, maintenance or certification purposes, as the dynamic behaviour of the trains is mainly induced by the track geometry. The stoch...

final step of rail manufacturing is cold rolling straightening process and it hassignificant effects on mechanical properties, straightness, flatness and development of residualstresses. measurement of residual stresses after straightening process is obligated by railmanufacturing standards. in the present investigation, an attempt has been made to evaluateresidual stresses after straightening ...

The effect of track geometry on vehicle vibration is a major concern in high-speed rail (HSR) operation from the perspectives ride comfort and safety. However, how to quantitatively characterize relation between them remains problem be solved quality assessment. By using fractal analysis, this paper studies detailed correlation surface alignment irregularities car body vertical lateral accelera...

For scheduling track maintenance, infrastructure managers perform inspections to assess the condition. When irregularities are higher than threshold limits, a has defect that should be corrected avoid future failures or traffic disruption. Scheduling maintenance actions contribute reliability and availability but demand prediction of evolution degradation. In recent years, several degradation m...