We consider the problem of partitioning the vertices of a weighted graph into two sets of sizes that differ at most by a given threshold B, so as to maximize the weight of the crossing edges. For B equal to 0 this problem is known as Max Bisection, whereas for B equal to the number n of nodes it is the Maximum Cut problem. We present polynomial time randomized approximation algorithms with non ...

Voltage unbalance negatively affects both distribution network operators (DNOs) and customers by introducing overheating, accelerated thermal ageing of equipments, reduced efficiency and therefore additional financial cost. Once a new source of unbalance appears in the network, the overall degree of unbalance of the network will be increased, contributing to the system losses additionally. The ...

Recently published International Electrotechnical Committee (IEC) technical reports IEC 61000-3-13 provides detailed methodologies for managing voltage unbalance (VU) in electric power systems. A key aspect in the VU emission allocation process is the estimation of VU propagation in different parts of the network. Although the VU propagation from upstream networks to downstream networks is adeq...

Problem statement: Activities of drug molecules can be predicted by Quantitative Structure Activity Relationship (QSAR) models, which overcome the disadvantage of high cost and long cycle by employing traditional experimental methods. With the fact that number of drug molecules with positive activity is rather fewer than that with negatives, it is important to predict molecular activities consi...

To study the typical failure mechanism (rotor unbalance, rotor friction, and crack) vibration characteristics of turbocharger system, a system dynamics simulation model was established by an improved four-node aggregate parameter method. The geometric physical under three states its operation were analyzed. Thus, established. On this basis, output signal extracted using Hu invariant moment feat...

This article proposes a control algorithm for single-phase battery inverters to provide voltage unbalance compensation in distribution networks with high penetration of photovoltaic panels and electric vehicles. A typical system is studied quantify the impact loads generating units on levels, identify conditions that lead highest unbalance. Voltage then performed by regulating active reactive p...

Rotor unbalance identification plays a critical role in balancing rotors. In this paper, concerned with multi-disc and multi-span rotor-bearing systems, two novel algorithms called the Single Direction Algorithm (SDA) Two Orthogonal (TODA) are proposed for identifying rotor from responses. A matrix method is to solve problem of equations being non-linear transcendental, there too many unknown v...

A residual-networks family with hundreds or even thousands of layers dominates major image recognition tasks, but building a network by simply stacking residual blocks inevitably limits its optimization ability. This paper proposes a novel residual-network architecture, Residual networks of Residual networks (RoR), to dig the optimization ability of residual networks. RoR substitutes optimizing...

The energy storage modular multilevel converter (MMC-ES) has been widely studied for its excellent performance in solving the problems of power difference, voltage fluctuation and effective improvement quality grid caused by integration new connection. Aiming at that units traditional distributed MMC-ES are scattered, inconvenient to assemble maintain, complex system control, centralized poor c...