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KCS is used at Carnegie Mellon University by the SPIRAL research team for optimally compiling scientific code (eg FFT).

KCS is used at Fakultas Ilmu Komputer, Indonesia for research about course scheduling.

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iForce

The Cars Sequencing Problem

Description

Some cars have to be scheduled on a production line. The cars differ by their options (the set of options of a car defines its type or class). Options are installed by stations: for each block of b consecutive cars, each station can handle at most s cars (s and b depend on the option/station). More on the cars sequencing problem...

Business and Industrial Applications

This problem has initially been proposed by the car manufacturer Renault.

Data

Data provided in the problem definition - Java file (14kb) [view] - is taken from CSPLIB.

Modelling & Solving

We have defined a very simple constraint model - Java file (14kb) [view].

The corresponding solver - Java file (1kb) [view] - uses a value heuristic inspired by this research report.

Results

Although very simple, our model allows us to sequence 200 cars in a few seconds (depending on the instances).

More examples...

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