26 research outputs found

    Real-time train driver rescheduling by actor-agent techniques

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    Passenger railway operations are based on an extensive planning process for generating the timetable, the rolling stock circulation, and the crew duties for train drivers and conductors. In particular, crew scheduling is a complex process. After the planning process has been completed, the plans are carried out in the real-time operations. Preferably, the plans are carried out as scheduled. However, in case of delays of trains or large disruptions of the railway system, the timetable, the rolling stock circulation and the crew duties may not be feasible anymore and must be rescheduled. This paper presents a method based on multi-agent techniques to solve the train driver rescheduling problem in case of a large disruption. It assumes that the timetable and the rolling stock have been rescheduled already based on an incident scenario. In the crew rescheduling model, each train driver is represented by a driver-agent. A driver-agent whose duty has become infeasible by the disruption starts a recursive task exchange process with the other driver-agents in order to solve this infeasibility. The task exchange process is supported by a route-analyzer-agent, which determines whether a proposed task exchange is feasible, conditionally feasible, or not feasible. The task exchange process is guided by several cost parameters, and the aim is to find a feasible set of duties at minimal total cost. The train driver rescheduling method was tested on several realistic disruption instances of Netherlands Railways (NS), the main operator of passenger trains in the Netherlands. In general the rescheduling method finds an appropriate set of rescheduled duties in a short amount of time. This research was carried out in close cooperation by NS and the D-CIS Lab

    The common field landscape: cultural commemoration and the impact of enclosure, c.1770-1850

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    The period of parliamentary enclosure in the eighteenth and nineteenth centuries has been viewed by many historians as the critical turning point in the history of the English landscape, its agriculture, and in the lives of those who lived there during this period. Indeed, the historiography of English rural life in the modern period has been dominated by the social and agricultural upheaval and change caused by parliamentary enclosure, dominating the assessments of land ownership and use within a number of related academic fields. Equally, art historians have generally examined paintings of the English landscape and its way of life only in relation to the ideologies of improvement and social change brought about by enclosure. As such, and as the landscape art historian, Michael Rosenthal, has put it, ‘we have tended not to keep an eye on (enclosure’s) antithesis – the common field landscape’. This chapter will readdress this position by exploring how the work of a number of artists and writers, such as William Turner of Oxford and Thomas Miller, continued to deliberately celebrate the common field landscape long after the process of enclosure had virtually wiped it out. It will explore the quite idiosyncratic nature of these visual and literary articulations of the common field landscape, and the deeply felt cultural and psychological motives for producing these in the face of the impact of enclosure
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