我国建设工程造价形成方式的改革

在市场经济条件下 ,建设工程作为商品生产具有明显的竞争性 ,反映建设工程商品交换的工程造价只能在市场竞争中形成。本文依据市场经济运行的一般规律和市场经济发达国家工程造价形成的实践经验 ,提出我国工程造价的形成应以工程价值及其转化形态为基础 ,主要在工程招投标竞争中形成 ,但工程造价的形成方式的改革 ,应随着整个国家经济体制 ,特别是投资管理体制和建筑业管理体制的转变而进行     

一种新颖实用的PLC防盗系统

PLC可编程控制器以其软件简单易学、使用简便、抗干扰能力强、运行可靠等优点在工业控制领域得到了广泛的运用.提出了一种基于PLC控制部件为核心的防盗系统方案,并对系统各部件的设置进行了较为详细的说明.     

Sequential monitoring of high-dimensional time series

In the paper we derive new types of multivariate exponentially weighted moving average (EWMA) control charts which are based on the Euclidean distance and on the distance defined by using the inverse of the diagonal matrix consisting of the variances. The design of the proposed control schemes does not involve the computation of the inverse covariance matrix and, thus, it can be used in the high-dimensional setting. The distributional properties of the control statistics are obtained and are used in the determination of the new control procedures. Within an extensive simulation study, the new approaches are compared with the multivariate EWMA control charts which are based on the Mahalanobis distance.