Production optimization involves the determination of optimum well controls to maximize an objective function such as cumulative oil production or net present value. In practice, this problem additionally requires the satisfaction of physical and economic constraints. Thus the overall problem represents a challenging nonlinearly constrained optimization. This work entails a comparative study of...

Speaker Name: David M. Panicek, MD Department of Radiology Memorial Sloan-Kettering Cancer Center, New York, NY [email protected] Highlights • MRI enables accurate diagnosis of certain primary and secondary bone tumors based on their tissue composition, morphology, and/or associated marrow edema pattern. • MRI provides essential details about the local extent of bone tumors, which allows accur...

One of the most arresting phenomena in the theory of pattern avoidance by permutations is the fact that the number of permutations of n letters that avoid a pattern π of 3 letters is independent of π. In this note we exhibit two generalizations of this fact, to ordered partitions, a.k.a. compositions, of an integer, and to permutations of multisets. It is remarkable that the conclusions are in ...

Sexual reproduction presents significant challenges to formal treatment of evolutionary processes. A starting point for systematic treatments of ecological and evolutionary phenomena has been provided by the gene-centered view of evolution which assigns effective fitness to each allele instead of each organism. The gene-centered view can be formalized as a dynamic mean-field approximation appli...

In this paper, we present a hybrid method that combines simulated annealing with pattern search based on the derivative information. In this method, when the object function is differentiable, we take the speed descent direction as the searching direction. This can dramatically decreases the work of the POLL step. The experiments shows that this hybrid method is efficient. Mathematics Subject C...