International Journal of Climatology, Jun 24, 2022
Western Europe is warming rapidly, much faster than the world average. To explain this phenomenon... more Western Europe is warming rapidly, much faster than the world average. To explain this phenomenon for the Netherlands, we look at the region where the airflow comes from instead of looking at the wind on the ground. Thereto, we consider 24 so‐called weather patterns, which describe the origin of the airflow (north, northeast, etc.) and whether the airflow comes straight at us, or with bending of isobars (cyclonal or anticyclonal). For each day from January 1, 1836 onwards, we have determined the corresponding weather pattern on basis of the weather maps from Reanalysis archives at wettercentrale.de. Using a statistical test, we can see that a shift has occurred in the weather patterns, which has resulted in a significant increase in airflow coming from warmer directions. We further have applied linear regression to explain the daily average temperatures on basis of the weather patterns for the period 1961–2020. In this way, we find for the daily model an R2 value of 0.60 and for the yearly model, based on the aggregated average daily values, we find an R2 of 0.81, which is increased to 0.85 when we take the influence of the Atlantic Multidecadal Oscillation (AMO) and the Total Solar Irradiance (TSI) into account. These values strongly suggest that the warming in the Netherlands is caused by a shift in the origin of the airflow to warmer directions.
In this paper we consider the integration of the personnel scheduling into planning railway yards... more In this paper we consider the integration of the personnel scheduling into planning railway yards. This involves an extension of the Train Unit Shunting Problem, in which a conflict-free schedule of all activities at the yard has to be constructed. As the yards often consist of several kilometers of railway track, the main challenge in finding efficient staff schedules arises from the potentially large walking distances between activities. We present two efficient heuristics for staff assignment. These methods are integrated into a local search framework to find feasible solutions to the Train Unit Shunting Problem with staff requirements. To the best of our knowledge, this is the first algorithm to solve the complete version of this problem. Additionally, we propose a dynamic programming method to assign staff members as passengers to train movements to reduce their walking time. Furthermore, we describe several ILP-based approaches to find a feasible solution of the staff assignme...
When trains are finished with their transportation tasks during the day, they are moved to a shun... more When trains are finished with their transportation tasks during the day, they are moved to a shunting yard where they are routed, parked, cleaned, subject to regular maintenance checks and repaired during the night. The resulting Train Unit Shunting and Servicing problem motivates advanced research in planning and scheduling in general since it integrates several known individually hard problems while incorporating many real-life details. We developed an event-based simulator called TORS (Dutch acronym for Train Shunting and Servicing Simulator), that provides the user with a state and all feasible actions. After an action is picked, TORS calculates the result and the process repeats. This simulator facilitates research into a realistic application of multi-agent path finding.
Alloimmunization is a well‐known adverse event associated with red blood cell (RBC) transfusions,... more Alloimmunization is a well‐known adverse event associated with red blood cell (RBC) transfusions, caused by phenotype incompatibilities between donor and patient RBCs that may lead to haemolytic transfusion reactions on subsequent transfusions. Alloimmunization can be prevented by transfusing fully matched RBC units. Advances in RBC genotyping render the extensive typing of both donors and patients affordable in the foreseeable future. However, the exponential increase in the variety of extensively typed RBCs asks for a software‐driven selection to determine the ‘best product for a given patient’.
International Journal of Climatology, Jun 24, 2022
Western Europe is warming rapidly, much faster than the world average. To explain this phenomenon... more Western Europe is warming rapidly, much faster than the world average. To explain this phenomenon for the Netherlands, we look at the region where the airflow comes from instead of looking at the wind on the ground. Thereto, we consider 24 so‐called weather patterns, which describe the origin of the airflow (north, northeast, etc.) and whether the airflow comes straight at us, or with bending of isobars (cyclonal or anticyclonal). For each day from January 1, 1836 onwards, we have determined the corresponding weather pattern on basis of the weather maps from Reanalysis archives at wettercentrale.de. Using a statistical test, we can see that a shift has occurred in the weather patterns, which has resulted in a significant increase in airflow coming from warmer directions. We further have applied linear regression to explain the daily average temperatures on basis of the weather patterns for the period 1961–2020. In this way, we find for the daily model an R2 value of 0.60 and for the yearly model, based on the aggregated average daily values, we find an R2 of 0.81, which is increased to 0.85 when we take the influence of the Atlantic Multidecadal Oscillation (AMO) and the Total Solar Irradiance (TSI) into account. These values strongly suggest that the warming in the Netherlands is caused by a shift in the origin of the airflow to warmer directions.
In this paper we consider the integration of the personnel scheduling into planning railway yards... more In this paper we consider the integration of the personnel scheduling into planning railway yards. This involves an extension of the Train Unit Shunting Problem, in which a conflict-free schedule of all activities at the yard has to be constructed. As the yards often consist of several kilometers of railway track, the main challenge in finding efficient staff schedules arises from the potentially large walking distances between activities. We present two efficient heuristics for staff assignment. These methods are integrated into a local search framework to find feasible solutions to the Train Unit Shunting Problem with staff requirements. To the best of our knowledge, this is the first algorithm to solve the complete version of this problem. Additionally, we propose a dynamic programming method to assign staff members as passengers to train movements to reduce their walking time. Furthermore, we describe several ILP-based approaches to find a feasible solution of the staff assignme...
When trains are finished with their transportation tasks during the day, they are moved to a shun... more When trains are finished with their transportation tasks during the day, they are moved to a shunting yard where they are routed, parked, cleaned, subject to regular maintenance checks and repaired during the night. The resulting Train Unit Shunting and Servicing problem motivates advanced research in planning and scheduling in general since it integrates several known individually hard problems while incorporating many real-life details. We developed an event-based simulator called TORS (Dutch acronym for Train Shunting and Servicing Simulator), that provides the user with a state and all feasible actions. After an action is picked, TORS calculates the result and the process repeats. This simulator facilitates research into a realistic application of multi-agent path finding.
Alloimmunization is a well‐known adverse event associated with red blood cell (RBC) transfusions,... more Alloimmunization is a well‐known adverse event associated with red blood cell (RBC) transfusions, caused by phenotype incompatibilities between donor and patient RBCs that may lead to haemolytic transfusion reactions on subsequent transfusions. Alloimmunization can be prevented by transfusing fully matched RBC units. Advances in RBC genotyping render the extensive typing of both donors and patients affordable in the foreseeable future. However, the exponential increase in the variety of extensively typed RBCs asks for a software‐driven selection to determine the ‘best product for a given patient’.
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Papers by Han Hoogeveen