One of the most important factors influencing the track maintenance is the transitions between parts of the track with different vertical stiffness. The dynamic...

This paper considers distributed multisensor applications, and finds redundant configurations that minimize system weight or cost while insuring system dependability. Given choices among different component types, fulfilling the system’s operational requirements but having different dependability parameters and per item cost, two heuristics, one non-monotone (tabu search) and one monotone (simu...

We present a new algorithm designed to solve floorplanning problems optimally. More precisely, the algorithm finds solutions to rectangle packing problems which globally minimize wirelength and avoid given sets of blocked regions. We present the first optimal floorplans for 3 of the 5 intensely studied MCNC block packing instances and a significantly larger industrial instance with 27 rectangle...

Continuous developments in the theory of computational complexity as applied to scheduling problems have revealed the existence of an amazing world of hard problems either all or none of which are solvable in polynomial time. In this paper, we study the structures of sequences and schedules in classical shop scheduling problems where one of the major tasks is to minimize certain regular objecti...

in this paper, a multi-product single machine scheduling problem with the possibility of producing defected jobs, is considered. we concern rework in the scheduling environment and propose a mixed-integer programming (mip) model for the problem.  based on the philosophy of just-in-time production, minimization of the sum of earliness and tardiness costs is taken into account as the objective fu...

this paper presents a mathematical model for a flow shop scheduling problem consisting of m machine and n jobs with fuzzy processing times that can be estimated as independent stochastic or fuzzy numbers. in the traditional flow shop scheduling problem, the typical objective is to minimize the makespan). however,, two significant criteria for each schedule in stochastic models are: expectable m...

The design of cellular manufacturing system (CMS) involves many structural and operational issues. One of the important CMS design steps is the formation of part families and machine cells which is called cell formation. In this paper, we propose an efficient algorithm to solve a new mathematical model for cell formation in cellular manufacturing systems based on cell utilization concept. The p...

We propose a structure called a causal site to use as a setting for quantum geometry, replacing the underlying point set. The structure has an interesting categorical form, and a natural " tangent 2-bundle, " analogous to the tangent bundle of a smooth manifold. Examples with reasonable finiteness conditions have an intrinsic geometry, which can approximate classical solutions to general relati...