In view of a direct and simple improvement vanilla SGD, this paper presents fine-tuning its step-sizes in the mini-batch case. For doing so, one estimates curvature, based on local quadratic model using only noisy gradient approximations. One obtains new stochastic first-order method (Step-Tuned SGD), enhanced by second-order information, which can be seen as version classical Barzilai-Borwein ...

the aim of this study is to explore the feasibility of setting up a commodities futures market in iran. specifications for the margin requirements, daily price movement limits, the length of expiration intervals, tick sizes and contract size of various potential future contracts are hereby examined. saffron, pistachio and rice emerge as the three suitable iranian agricultural commodities. a new...

Bumper beams and crash boxes are structural vehicle elements that have very critical functions during frontal collisions. This study examined the energy ab-sorbed by front bumper system reaction forces to cage structure representing cabin frame a full against rigid wall. For this purpose, 25 different analyses were conducted using ANSYS software changing sheet thickness values of beam (t1) boxe...