Decentralized and overall condition monitoring system for large-scale mobile and complex equipment

It is an urgent project to realize online and overall condition monitoring and timely fault diagnosis for large-scale mobile and complex equipment. Moreover, most of the existing large-scale complex equipment has quite insufficient accessibility of examination, although it still has quite a long service life. The decentralized and overall condition monitoring, as a new concept, is proposed from the point of view of the whole system. A set of complex equipment is divided into several parts in terms of concrete equipment. Every part is processed via one detecting unit, and the main detecting unit is connected with other units. The management work and communications with the remote monitoring center have been taken on by it. Consequently, the difficulty of realizing a condition monitoring system and the complexity of processing information is reduced greatly. Furthermore, excellent maintainability of the condition monitoring system is obtained because of the modularization design. Through an application example, the design and realization of the decentralized and overall condition monitoring system is introduced specifically. Some advanced technologies, such as, micro control unit (MCU), advanced RISC machines (ARM), and control area network (CAN), have been adopted in the system. The system's applicability for the existing large-scale mobile and complex equipment is tested.     

煤矿闭路电视监控系统中的视频传输技术

介绍了几种适用于煤矿的工业电视监控系统的视频传输技术，着重阐述了这些系统各自的特点及适用的范围、选型原则。     

中性氧乙炔监测方法的试验研究

针对氧乙炔火焰的不同形状和性质，研究设计了流量测控装置，实测了常用喷枪在一定范围内的有关气体参数，测定了中性焰在不同强度下氧和乙炔的流量比，为喷焊工艺在火焰性质掌握方面提供方便．     

Exponential smoothing: The state of the art

This paper is a critical review of exponential smoothing since the original work by Brown and Holt in the 1950s. Exponential smoothing is based on a pragmatic approach to forecasting which is shared in this review. The aim is to develop state-of-the-art guidelines for application of the exponential smoothing methodology. The first part of the paper discusses the class of relatively simple models which rely on the Holt-Winters procedure for seasonal adjustment of the data. Next, we review general exponential smoothing (GES), which uses Fourier functions of time to model seasonality. The research is reviewed according to the following questions. What are the useful properties of these models? What parameters should be used? How should the models be initialized? After the review of model-building, we turn to problems in the maintenance of forecasting systems based on exponential smoothing. Topics in the maintenance area include the use of quality control models to detect bias in the forecast errors, adaptive parameters to improve the response to structural changes in the time series, and two-stage forecasting, whereby we use a model of the errors or some other model of the data to improve our initial forecasts. Some of the major conclusions: the parameter ranges and starting values typically used in practice are arbitrary and may detract from accuracy. The empirical evidence favours Holt's model for trends over that of Brown. A linear trend should be damped at long horizons. The empirical evidence favours the Holt-Winters approach to seasonal data over GES. It is difficult to justify GES in standard form–the equivalent ARIMA model is simpler and more efficient. The cumulative sum of the errors appears to be the most practical forecast monitoring device. There is no evidence that adaptive parameters improve forecast accuracy. In fact, the reverse may be true.     

基于非等间隔GM(1,1)模型冲压线油液的光谱分析

针对冲压线油液监测的光谱数据，分别进行了级比平滑和级比界区检验，检验其是否满足灰色理论中非等间隔GM(1，1)模型的应用条件，对不同长度和不同级比平滑度的序列进行了拟合、预测，计算结果显示该模型可很好地用于冲压线状态的分析和预测；同时根据不同序列计算结果的分析比较，提出了关于应用该模型模拟、预测监测对象运行状态以及数据采样的一些建议。     

基于JAVA的连铸旋转塔远程监测诊断系统

采用基于B/S三层结构的工作模式,讨论了如何使用Java技术实现实时监测系统,针对某炼钢厂的主体设备———连铸旋转塔,开发出一套远程监测诊断系统并投入实际运行。     

甄别、审查和消费信贷研究

基于目标规划及博弈论等原理，对贷款申请者的事前甄别和事后审查进行建模分析以降低银行不能收回贷款的风险．结果表明，当贷款规模相对审查成本偏小时(如消费信贷)，贷款人为了收回没有偿还的贷款而采取成本高昂的审查行动可能存在一定的困难，因此审查的决策必须是事后最优的；通过事前对贷款申请人进行甄别，贷款人能够降低借款人不能还款的概率，并且也能降低借款人能偿还借款但选择不偿还借款的概率．在一个竞争性的环境中，甄别成本可通过较高的贷款利率被转移到借款人．     

伪劣商品监控费用分配的探讨

运行良好的伪劣商品监控系统是有效控制伪劣商品泛滥的根本保证，合理分配和使用已经预算出的监控费用是取得最佳监控效果的前提，而预算费用的最佳使用效果依赖于每一个层次上的最佳使用方法。通过层次分析法可以有效地解决费用分配问题。     

微机监控在集中供热节能方面的应用

介绍了微机监控在集中供热节能方面的应用，提出了供热节能的主要方案，从网络总布局、主控中心的配置及功能、供热站的配置及功能、通讯等方面论述了节能方案的实现。     

位移监控及预报方法在地下工程中的应用

以北京地铁西单车站横通道施工为例,对位移监控及预报方法在地下工程中的实际应用作了详细介绍,得出了某些规律性的认识。