Deniz M. Cicek

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We consider the Kiefer-Wolfowitz (KW) stochastic approximation algorithm and derive general upper bounds on its mean-squared error. The bounds are established using an elementary induction argument and phrased directly in the terms of tuning sequences of the algorithm. From this we deduce the nonnecessity of one of the main assumptions imposed on the tuning(More)
We extend the scaled-and-shifted Kiefer-Wolfowitz (SSKW) algorithm developed by Broadie, Cicek, and Zeevi (2009) to multiple dimensions. The salient feature of this algorithm is that it makes adjustments of the tuning parameters that adapt to the underlying problem characteristics. We compare the performance of this algorithm to the traditional(More)
We consider prototypical sequential stochastic optimization methods of Robbins-Monro (RM), Kiefer-Wolfowitz (KW), and Simultaneous Perturbations Stochastic Approximation (SPSA) varieties and propose adaptive modifications for multidimensional applications. These adaptive versions dynamically scale and shift the tuning sequences to better match the(More)
A design for a unique artificial-hair-cell-type sensor (AHCTS) based entirely on 3D-structured, vertically aligned carbon nanotube (CNT) bundles is introduced. Standard microfabrication techniques were used for the straightforward micro-nano integration of vertically aligned carbon nanotube arrays composed of low-layer multi-walled CNTs (two to six layers).(More)
Several cross-section empirical studies argue that a higher tax burden or different indicators of statutory tax rates are associated with a smaller informal economy. I show that the turnover of governments provides the key to understanding this relation. To this end, I present evidence that once political turnover is controlled for, the data shows no(More)
At a certain period during the last century, former Yugoslavia (which among others used to include Bosnia and Herzegovina, Croatia, and Serbia) was the biggest producer of plums in the world. Traditional plum cultivars, still grown in this region, represent a mixture of several species including: European plums (Prunus domestica L.), mirabelles (Prunus(More)
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