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Given:
a set of N products, each with a: demand rate D, constant over time, and production rate P, when the product is being produced, holding cost rate H per unit in inventory,
and for each pair of products, (i, j): T(i,j) = changeover time from product i to product j, S(i,j) = changeover cost from product i to product j,
Find:
a sequence of the products that is in fact a cycle that repeats, a cycle length CYCTIME,
so as to
minimize the cost of changeover + inventory, subject to cycle being long enough to produce every product exactly once.