The AMP-AKZO Riverhead Circuits Division is responsible for manufacturing printed circuit boards. Scheduling problems have resulted from both physical and operating constraints. The AMP-AKZO PROVISA Scheduling System ( A P S S ) was developed to better manage order due-date and plant throughput performance. The fully integrated system is made up of the Production Control Inventory System (PCIS)...

Real world scheduling requirements are related with complex systems operating in dynamic environments. This means that they are frequently subject to several kinds of random occurrences and perturbations, such as new job arrivals, machine breakdowns, employee’s sickness and jobs cancellation causing prepared schedules becoming easily outdated and unsuitable. Scheduling under this environment is...

A simulation-based real-time scheduling mechanism for dynamic discrete manufacturing is presented in this paper. Modified mean flow time performance for different scheduling approaches is compared through off-line simulation experiments, under dynamic manufacturing environments that are subjects to disturbances such as machine breakdowns. These experimental results are used as reference indices...

Supply chain design models in the literature typically assume that facilities never fail. However, in the real world cases facilities are always subject to disruptions of various sorts due to natural disasters, strikes, machine breakdowns, power outages, and other factors. This paper presents an integrated supply chain network design model with the consideration of facility disruptions. Specifi...

In this paper, a multiple-identical-machine manufacturing system with random breakdowns, repairs and preventive maintenance activities is considered. The objective of the control problem is to "nd the production and the preventive maintenance rates of the machines so as to minimize the total cost of inventory/backlog. By combining analytical formalism and simulation based statistical tools such...

Breakdowns in complex systems often occur as a result of system elements interacting in ways unanticipated by analysts or designers. In systems with human operators, human-automation interaction associated with both normative and erroneous human behavior can contribute to such failures. This paper presents a method for automatically generating task analytic models encompassing both erroneous an...

Direct implicit simulation of complex steady state ows is usually too dii-cult numerically in the absence of a good initial guess. \Pseudo-transient-continuation" is a physically motivated technique that follows the physical transient solution starting from a uniform ow. Here, a delicate choice of the time steps, or the CFL numbers is crucial to reduce the number of iterations. However , existi...

It has been known for some time that non-destructive electric breakdowns precede destructive thermal dielectric breakdown. We have been studying both processes in oxides between 5 nm and 80 nm in thickness. We have shown that the electric breakdowns can trigger dielectric breakdown under certain conditions. This triggering of dielectric breakdown causes TDDB distributions to be nonunique. The T...