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The thesis discusses machine setup problems which arise in high-mix, lowvolume production environments of printed circuit board assembly (PCB) industry. We concentrate especially on the hybrid setup problem that is a combination of the job grouping and minimum setup problems. We define an objective function that minimizes a weighted sum of the number of(More)
— For a given endomorphism h on a finitely generaled jree monoid there are only flnitely many primitive words w for which h(w) = w for some n^2. Also, one can effectively find ail such w. Using this it is shown that it is decidable whether or not a morphism h defines an ultimately periodic infinité word when iterated on a given word. This latter resuit thus(More)