In picking product items in a warehouse to fulfill customer orders, a practical way is to classify similar orders as the same batch and then to plan the optimal picker routing when picking each batch of items. Different from the previous problems, this work investigates the joint order batching and picker Manhattan routing problem, which simultaneously determines the optimal order batching allo...

Order picking is one of the most demanding activities in many warehouses terms capital and labor. In parts-to-picker systems, automated vehicles or cranes bring parts to a human picker. The storage assignment policy, products locations, influences order efficiency. Commonly used policies, such as full turnover-based class-based storage, only consider frequency at which each product has been req...

The rise in online and multichannel retailing has pushed retailers to give increased attention to their order fulfillment operations. We study “chaotic storage” fulfillment systems in which dissimilar items are stored together in a single location. This necessitates a searching task as part of the picking process which has not been previously studied. We show that pick times increase by as much...

BACKGROUND While there is interest in measuring the satisfaction of patients discharged from psychiatric hospitals, it might be important to determine whether surveys of psychiatric patients should employ generic or psychiatry-specific instruments. The aim of this study was to compare two psychiatric-specific and one generic questionnaires assessing patients' satisfaction after a hospitalisatio...

The enteric pathogen Campylobacter can be carried into poultry processing facilities on and within live birds. Numbers of Campylobacter recovered from carcasses decrease after scalding but increase during feather removal. Mechanical feather picking causes mist as well as particles of dust, feathers, feces, and other matter to become airborne around the machine. This study was conducted to deter...