The well-known logic puzzle Sudoku can be generalized from two to three dimensions by designing a puzzle that is played on the faces of a cube. One variation, already introduced as a puzzle by Dion Church, uses three adjacent faces. Another variation uses all six faces. We have developed a set of rules and constraints for both three-dimensional Sudoku variations and have studied the properties ...

A new constraint-driven methodology for the placement of analog IC's is described. Electrical performance speciications are automatically translated into constraints on the layout parasitics. These constraints and the sensitivity information of the circuit are then used to control a Simulated Annealing-based placement algorithm. At each step of the annealing a fast check on performance degradat...

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We study the thermodynamic behavior of the random chain model proposed by Iori, Marinari and Parisi, and how this depends on the actual sequence of interactions along the chain. The properties of randomly chosen sequences are compared to those of designed ones, obtained through a simulated annealing procedure in sequence space. We show that the transition to the folded phase takes place at a sm...

A simulated annealing algorithm is used in the construction of subsquare free Latin squares. The algorithm is described and experience from its application is reported. Results obtained include the construction of subsquare free Latin squares of orders 16 and 18, the smallest orders for which existence of such squares was previously in doubt.