This text describes the use of a Coevolutionary Genetic Algorithm (CGA) for process control. The CGA combines two Artificial Life techniques life-time fitness evaluation (LTFE) and coevolution to improve the genetic search for a Neural Network (NN) controlling a given process. Here, the approach is illustrated and tested on a well-known bioreactor control problem which involves issues of delay,...

Lower Line Edge/Width roughness, high resolution, and superior EUVimaging quality, have been achieved using a novel class of chemically amplified resists. 25nm 1:1 line:space features in addition to sub-25nm overexposed lines have been patterned using standard coating and exposure procedures. Examining 1μm x 0.5μm windows of top-down SEM images revealed very promising LER and LWR values of 2.7n...

In this paper, first the available single charting methods, which have been proposed to detect simultaneous shifts in a single process mean and variance, are reviewed. Then, by designing proper simulation studies these methods are evaluated in terms of in-control and out-ofcontrol average run length criteria (ARL). The results of these simulation experiments show that the EWMA and EWMS methods ...

High-density polyethylene (HDPE) pipes find versatile applicability for transportation of water, sewage and slurry from one place to another. Hence, these pipes undergo tremendous pressure by the fluid carried. The present work entails the optimization of the withstanding pressure of the HDPE pipes using Taguchi technique. The traditional heuristic methodology stresses on a trial and error appr...

the most well-known uni-arribute control chart used to monitor the number of nonconformities per unit is the shewhart type c-chart. in this paper, a new method is proposed in an attempt to reduce the false alarm rate in the c-chart. to do this, the decision on beliefs (dob) concept is first uti [1] corresponding author e-mail: [email protected]   lized to design an iterat...

in this project creep feed grinding process of gas turbine blade root is investigated with the aim of consistant and controlable production. inthispaper, effectiveness of creep feed grinding process prometers suchas wheel speed, workpiece speed, grind depth and dresser speed are investigated. this investigation include their interaction on thelob of gas torbine blade root, as amajor cause of a ...

Abstract The present work will address the problem of designing an in-process control system for a tube hydro-forming process, controlling tool filling forming T-tube. is nontrivial as wrinkling and bursting develop rapidly and, in most cases, are irreversible—thus, must react fast without extensive overshoot. objective to filling, reproducing reference trajectory, where controller input define...