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SACEM is a partly embedded system (hard and soft) which continously controls the speed of all trains on the RER Line A in Paris. The limit of the conventional signaling system (which was not computerized) was at a minimum of 2mn 30s headway between trains. The requirement for the new system SACEM was to increase traffic by 25 % with at least the same safety(More)
Algorithms to file and retrieve information in a memory are used currently for many applications: compilers, systems, business, artificial intelligence, etc.... For example, binary search and Hash coding allow a compromise between memory size and number of access operations to be obtained. But, in many cases, distance or neighborhood has to be preserved. We(More)
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