Variable speed oil free screw compressors can be used in upstream oil and gas applications such as gas collection and flare gas recovery. The critical nature of these applications is such that the owners closely monitor the drive train of the package as long un-planned stoppages are extremely expensive. If any of the monitored parameters start to deviate from the norm then shut-downs and servic...

We give eecient algorithms to compute an optimal bipartition of a set of points or a set of simple polygons in the plane. In particular, we give an O(n 2) algorithm for partitioning a set of n points into two subsets in order to minimize the sum of the perimeters of the convex hulls. We also examine the problems of minimizing the maximum of the perimeters, or the sum/maximum of the areas, for t...

This paper presents a new mathematical model for the problem of scheduling part families and jobs within each part family in a flow line manufacturing cell where the setup times for each family are sequence dependent and it is desired to minimize the maximum completion time of the last job on the last machine (makespan) while processing parts (jobs) in each family together. Gaining an optimal s...

We report experimental demonstration of an all-optical continuously tunable delay line based on parametric mixing with a total delay range of 7.34 mus. The bit-error rate performance of the delay line was characterized for a 10-Gb/s NRZ data channel. This result is enabled by cascading a discrete delay line that consists of 16 wavelength-dependent delays and a continuously tunable delay stage. ...

A new scheme of stack DRAM referred to as Capacitor-Equiplanar-to-Bitline (CEB) is proposed for minimizing bitline coupling noises. The cell capacitors are fabricated in between bit-lines, so that the bit-line coupling is blocked by the node capacitor and shielded by the plate. 3D simulation shows that the bit-line coupling noise is almost eliminated (<1% of total bit-line capacitance) in CEB s...

The tendency to throw controls at perceived and real system vulnerabilities, coupled with the likelihood of these controls being technical in nature, has the propensity to favour security over usability. However there is little evidence of increased assurance and it could encourage work stoppages or deviations that keep honest users from engaging with the system. The conflicting balance of trus...

vVe prove lower bounds on the competitive ratio of randomized algorithms for several on-line scheduling problems. The main result is a bound of ej(e 1) for the on-line problem with objective minimizing the sum of completion times of jobs that arrive over time at their release times and are to be processed on a single machine. This lower bound shows that a randomized algorithm designed in [Cheku...

Model based tools allow optimizing the freeze-drying of a pharmaceutical formulation in a specific freeze-dryer, thus minimizing the duration of the process, beside maintaining product temperature below a limit value to preserve product quality. This paper is focused on the comparison of the results that can be obtained optimizing the process either off-line, using the design space of the formu...