Marie Schmidt

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The question of delay management is whether trains should wait for delayed feeder trains or should depart on time. Solutions to this problem strongly depend on the available capacity of the railway infrastructure. While the limited capacity of the tracks has been considered in delay management models, the limited capacity of the stations has been neglected(More)
The fast and cost-efficient home delivery of goods ordered online is logistically challenging. Many companies are looking for new ways to cross the last-mile to their customers. One technology-enabled opportunity that recently has received much attention is the use of a drone to support deliveries. An innovative last-mile delivery concept in which a truck(More)
Trains often arrive delayed at stations where passengers have to change to other trains. The question of delay management is whether these trains should wait for the original train or depart on time. In traditional delay management models passengers always take their originally planned route. This means, they are in case of a missed connection always(More)
The passengers of railway transport systems occasionally need to deal with disruptions. In such situations, perfect information, for example about the duration of the disruption, is usually not available. As a result, passengers need to make decisions on the continuation of their journey in a highly uncertain context. In this paper, we introduce the(More)
One of the most complex issues currently under debate in this country is how best to provide health care for our society. Since 1995, Poudre Valley Hospital in Fort Collins, Colorado, has been effectively addressing one facet of this national crisis by providing services to a population of primarily elderly, chronically ill individuals perpetually caught in(More)
We consider the problem of designing lines in a public transport system, where we include user-optimal route choice. The model we develop ensures that there is enough capacity present for every passenger to travel on a shortest route. We present two different integer programming formulations for this problem, and discuss exact solution approaches. To solve(More)
To model and solve optimization problems arising in public transportation, data about the passengers are necessary and have to be included in the models in any phase of the planning process. Many approaches assume a two-step procedure: in a first step, the data about the passengers are distributed over the public transportation network (PTN) using(More)
Let's read! We will often find out this sentence everywhere. When still being a kid, mom used to order us to always read, so did the teacher. Some books are fully read in a week and we need the obligation to support reading. What about now? Do you still love reading? Is reading only for you who have obligation? Absolutely not! We here offer you a new book(More)
The stable carbon isotope composition of chlorinated aliphatic compounds such as chlorinated methanes, ethanes and ethenes was examined as an intrinsic fingerprint for apportionment of sources. A complex field site located in Ferrara (Italy), with more than 50years history of use of chlorinated aliphatic compounds, was investigated in order to assess(More)