The South African Sugar Association Experiment Station, Agricultural Engineering Department conducted a series of semi-mechanised versus fully mechanised harvesting trials on a large commercial estate in Swaziland over the 1998/1999, 2000/2001 and 2001/2002 seasons. During the trials machinery performance was measured, differences in the quality of cane delivered to the factory were determined,...

We propose a new unidirectional proxy re-encryption scheme based on the hardness of the LWE problem. Our construction is collusionsafe and does not require any trusted authority for the re-encryption key generation. We extend a recent trapdoor definition for a lattice of Micciancio and Peikert. Our proxy re-encryption scheme is provably CCA-1 secure in the selective model under the LWE assumption.

Planned maintenance and construction activities are crucial for heavily used railway networks to cope with the ever increasing demand. These lead changes in timetable rolling stock schedule (often multiple days) can have a major impact on crew schedule, as render many planned duties infeasible. In this paper, we propose novel integrated approach re-planning, i.e., of new rosters employees given...

___________________________________________________________________________________________ Purpose: The role of Helicobacter pylori (Hp) in the development of gastroesophageal reflux disease (GERD) remains disputable. This study was planned to determine clinical-epidemic correlations between reflux esophagitis (RE) and Hp in older children. Materials and methods: 308 children with RE and 418 p...

BACKGROUND To analyse the frequency of re-planning and its variability dependent on the IGRT correction strategy and on the modification of the dosimetric criteria for re-planning for the spinal cord in head and neck IG-IMRT. METHODS Daily kV-control-CTs of six head and neck patients (=175 CTs) were analysed. All volumes of interest were re-contoured using deformable image registration. Three...

Abstract Introduction Ventilator Associated Pneumonia (VAP), as defined by the Centers for Disease Control and prevention (CDC), is a pneumonia that occurs in a patient receiving mechanical ventilation that develops 48 hours or more after initiation of ventilation. Re-intubation which occur within 72 hours of planned extubation may be effective in VAP incidence. The aim of this study was to det...

In the Dutch railway network, there are a few times per week modifications in the timetable necessary due to unexpected maintenance projects or planned maintenance project that finish later than expected. Moreover, there are about 20 disruptions per day on average. These disruptions can be caused by the infrastructure (e.g. broken switches, no power supply), the weather (e.g. longer braking tim...