BACKGROUND In their working activity, seafarers are exposed to high levels of stress that should be accuratelyinvestigated, measured, followed up and, if possible, countered. This is also required by regulations recently entered into force such as the Maritime Labour Convention 2006, recommending to consider special physiological or psychological problems created by the shipboard environment. T...

Schedule development is typically the first phase of the airline planning process. We present a framework for perturbing scheduled departure and arrival times after a crew schedule has been found. We characterize perturbations that keep a schedule legal while not increasing the planned cost of the crew schedule. We show that when random delays occur in operations, the expected cost can be reduc...

This study examined physiological and psychological changes in one solo truck driver and both drivers in a two-up truck crew during several 5-6 day round-trips to the north west of Western Australia. Endocrine catecholamine levels, cardiac sinus arrhythmia and serial reaction performance all showed progressive changes over the journey. The solo driver showed greater changes on most measures tha...

Background The choice of medical staffing in helicopter emergency systems (HEMS) is continuously under debate. Many studies have attempted to demonstrate the benefit of one profession over the other. Only one RCT-study on staffing models in HEMS randomized patient care to either a physician and nurse or nurse and paramedic [1]. None of the studies have however succeeded in providing the answer ...

This paper deals with large-scale crew scheduling problems arising at the Dutch railway operator, Netherlands Railways (NS). NS operates about 30,000 trains a week. All these trains need a driver and a certain number of conductors. No available crew scheduling algorithm can solve such huge instances at once. A common approach to deal with these huge weekly instances, is to split them into sever...

We study a tactical level crew capacity planning problem in railways which determines the minimum required crew size in a region while both feasibility and connectivity of schedules are maintained. We present alternative mathematical formulations which depend on network representations of the problem. A path-based formulation in the form of a set-covering problem along with a column-and-row gen...

To assess, from flight crew perspectives, the benefits and limits of a new spacing instruction, a pilot-in-the-loop experiment was conducted. Beyond assessing interface usability and overall feasibility, the experiment aimed at analysing the impact of various tolerance margins on flight crew activity. Flight crew feedback was generally positive. Despite a new task in the cockpit, which requires...

In this paper the ability to efficiently solve large crew scheduling problems on a network of workstations (NOW) is presented. Large crew scheduling problems from the Lufthansa set of problems have been solved with a near linear speedup on the generator component of the problem. The generator is the most time consuming component of the solution process, which implies that a significant improvem...