Implementation of a fixing strategy and parallelization in a recent global optimization method

Electromagnetism-like Mechanism (EM) heuristic is a population-based stochastic global optimization method inspired by the attraction-repulsion mechanism of the electromagnetism theory. EM was originally proposed for solving continuous global optimization problems with bound constraints and it has been shown that the algorithm performs quite well compared to some other global optimization methods. In this work, we propose two extensions to improve the performance of the original algorithm: First, we introduce a fixing strategy that provides a mechanism for not being trapped in local minima, and thus, improves the effectiveness of the search. Second, we use the proposed fixing strategy to parallelize the algorithm and utilize a cooperative parallel search on the solution space. We then evaluate the performance of our study under three criteria: the quality of the solutions, the number of function evaluations and the number of local minima obtained. Test problems are generated by an algorithm suggested in the literature that builds test problems with varying degrees of difficulty. Finally, we benchmark our results with that of the Knitro solver with the multistart option set

Spartan Daily, October 30, 2014

Volume 143, Issue 28https://scholarworks.sjsu.edu/spartandaily/1527/thumbnail.jp

Time's Arrow, December 8, 1995

This is the concert program of the Time's Arrow performance on Friday, December 8, 1995 at 8:00 p.m., at the Tsai Performance Center, 685 Commonwealth Avenue, Boston, Massachusetts. Works performed were Three Songs for Soprano and Chamber Ensemble by Cheng Chia Wu, Octet by Galina Ustvolskaya, Alarums and Excursions by Joyce Mekeel, and Chain I by Witold Lutoslawski. Digitization for Boston University Concert Programs was supported by the Boston University Humanities Library Endowed Fund