Local monotonicity of measures supported by graphs of convex functions

Let $f \in C^2(\mathbb{R})$ satisfy $f(0)=f'(0)=0$ and f''(0) > 0. Then the $1$-dimensional Hausdorff measure restricted to the graph of $f$ is locally monotone near the origin in the sense that there exists $\sigma>0$ such that the function $r \mapsto \frac{\mu_fB(z,r)}{r}$ is nondecreasing on $(0,\sigma)$ for every centre $z \in B(\sigma)$. The result is reformulated for Hausdorff measures restricted to uniformly $C^2$-curves in $\mathbb{R}^2$ with the curvature bounded away from zero and infinity

Crawling in Rogue's dungeons with (partitioned) A3C

Rogue is a famous dungeon-crawling video-game of the 80ies, the ancestor of its gender. Rogue-like games are known for the necessity to explore partially observable and always different randomly-generated labyrinths, preventing any form of level replay. As such, they serve as a very natural and challenging task for reinforcement learning, requiring the acquisition of complex, non-reactive behaviors involving memory and planning. In this article we show how, exploiting a version of A3C partitioned on different situations, the agent is able to reach the stairs and descend to the next level in 98% of cases.Comment: Accepted at the Fourth International Conference on Machine Learning, Optimization, and Data Science (LOD 2018

Experimental Research of Harmonic Spectrum of Currents at Traction Drive with PMSM

The paper deals with the significant results of the experimental research of current harmonic spectrum of traction drive with permanent magnet synchronous motor. The experiments were done on a special workplace with a real traction drive for wheel vehicles. Current harmonic spectrum was analyzed by a specialized device on the base of central measuring station. The knowledge of current marked subharmonic components of stator winding is the most significant finding of experiments. The frequencies of these components are given by multiples of frequency of mechanical speeds. The subharmonic components also pass to input DC current of drive. This fact is important in particular from the point of view of legislative requirements to electromagnetic compatibility of drive with railway interlocking devices

Traction Permanent Magnet Synchronous Motor Torque Control with Flux Weakening

The paper deals with analysis of dynamic behavior of a feedback flux weakening control of PMSM traction drive for light vehicles. The PMSM flux weakening is very important for traction drives. Two torque control structures were analyzed - pure feedback control and feedback control with prediction of the field producing current component. The principles, control structures, simulation and experimental results are given

Palliative Urinary Diversion in Adenocarcinoma of the Prostate

Ten patients with inoperable prostatic carcinoma, producing ureteral obstruction and azotemia, underwent palliative urinary diversion. Good quality survivals of two months to three years were obtained. These results compare favorably with the good results seer) In gynecologic neoplasm of the bladder, colon and breast. In selected cases of carcinoma of the prostate, palliative urinary diversion is indicated when the prospects exist for further benefit from chemotherapy or radiotherapy