开车打手机:车主梦想的消费时尚

日前,有名叫黄土地的青年编辑“不务正业“,鬼使神差地搞起了发明创造,成了一名远近闻名的发明家!他利用业余时间刻苦钻研科学技术,经过十年零三个月的研究发明了一种“声控通“摩托车车载人机对话系统,驾驶摩托车也可以打手机了。“这简直是胡说八道,交通法规明文规定开车不准打手机。“——有人对此事     

Reliability analysis of electrical system of computer numerical control machine tool based on bayesian networks

The core of computer numerical control (CNC) machine tool is the electrical system which controls and coordinates every part of CNC machine tool to complete processing tasks, so it is of great significance to strengthen the reliability of the electrical system. However, the electrical system is very complex due to many uncertain factors and dynamic stochastic characteristics when failure occurs. Therefore, the traditional fault tree analysis (FTA) method is not applicable. Bayesian network (BN) not only has a unique advantage to analyze nodes with multiply states in reliability analysis for complex systems, but also can solve the state explosion problem properly caused by Markov model when dealing with dynamic fault tree (DFT). In addition, the forward causal reasoning of BN can get the conditional probability distribution of the system under considering the uncertainty; the backward diagnosis reasoning of BN can recognize the weak links in system, so it is valuable for improving the system reliability.