考虑人力资源约束的串联系统机会维修策略优化

针对多部件串联系统维修存在人力资源约束的问题，提出一种考虑人力资源配置的机会维修策略模型。针对部件在使用过程中受外部环境影响发生劣化的特点，引入役龄回退因子和故障率递增因子，建立单部件的预防性维修策略。引入机会维修思想，以机会维修系数作为优化变量，对系统的维修策略进行组合优化，在维修人员有限的条件下确定维修任务的配置以及系统的停机时间，进一步构建考虑人力资源约束的串联系统机会维修策略模型。最后，针对算例进行建模，通过元胞自动机算法应用MATLAB进行仿真分析，获得系统的最优机会维修方案。结果显示：考虑机会维修的策略相比传统的预防性维修可有效降低维修成本13.6%,提高系统的可用度2.05%,考虑人力资源约束的机会维修策略相比人员无约束的机会维修策略可有效降低维修成本7.3%,此时经济效益最高。     

热电偶串并联在工程检测中的应用

本文分别对几种特定情况下热电偶串、并联的工作状况进行了分析,并讨论了如何对热电偶在某些特定情况下的串、并联加以应用。     

I/A Series控制系统在BDO装置中的应用

本文介绍了FOXBORO的I/A Series控制系统的特点,结合宁夏英力特年产200000t BDO项目阐述设计方案及应用情况。该系统运行稳定、性能优良,确保了BDO装置的正常运行。     

I/A Series系统在空分装置中的应用

空分装置采用性能优良、可靠性高的I/A Series系统实现了数据采集、工艺控制、状态流程显示、趋势记录、报警等功能。该系统运行稳定,保证了空分装置的正常运行。     

基于遗传算法和LSSVM的网络安全事件发生频率预测

Since the frequency of network security incidents is nonlinear, traditional prediction methods such as ARMA, Gray systems are difficult to deal with the problem. When the size of sample is small, methods based on artificial neural network may not reach a high degree of preciseness. Least Squares Support Vector Machines (LSSVM) is a kind of machine learning methods based on the statistics learning theory, it can be applied to solve small sample and non-linear problems very well. This paper applied LSSVM to predict the occur frequency of network security incidents. To improve the accuracy, it used an improved genetic algorithm to optimize the parameters of LSSVM. Verified by real data sets, the improved genetic algorithm (IGA) converges faster than the simple genetic algorithm (SGA), and has a higher efficiency in the optimization procedure. Specially, the optimized LSSVM model worked very well on the prediction of frequency of network security incidents.     

基于ARIMA模型自动预测我国保险行业保费收入的应用和实践

本文采用ARJMA模型以我国财产险的保费收入的预测为例,对数据预处理、模型的选择、识别、估计、检验等过程进行了详细的分析,得出了预测结果报告,并描述了对我国产寿险的保费收入实现自动预测并得到结果报表的思路和方法。     

Solar radiation and cooling load calculation for radiant systems: Definition and evaluation of the Direct Solar Load

The study of the influence of solar radiation on the built environment is a basic issue in building physics and currently it is extremely important because glazed envelopes are widely used in contemporary architecture.In the present study, the removal of solar heat gains by radiant cooling systems is investigated. Particular attention is given to the portion of solar radiation converted to cooling load, without taking part in thermal absorption phenomena due to the thermal mass of the room. This specific component of the cooling load is defined as the Direct Solar Load.A simplified procedure to correctly calculate the magnitude of the Direct Solar Load in cooling load calculations is proposed and it is implemented with the Heat Balance method and the Radiant Time Series method.The F ratio of the solar heat gains directly converted to cooling load, in the case of a low thermal mass radiant ceiling, is calculated for different kinds of office rooms with a large glazed external surface. An example of cooling load calculation developed with the proposed procedure is given.     

基于改进智能用电优化算法的家庭智能用电管理系统

为了提升家庭智能用电管理系统的计算效能,使用时序分析算法,将远程抄表实时费控电能表采集的1s步长的电流、电压数据序列,整理成5列录波图,并利用线性重投影算法形成可供神经网络识别的时序序列,使用加权卷积多列神经网络进行挖掘,将用户每1s步长的用电量信息分解成空调、插座、照明等负荷用电量信息,最终形成家庭智能用电管理系统的数据分解展示功能。经过与针对上述负荷单独安装电能表的实测数据进行对比,发现该改进智能用电优化算法得到的用电量分解结果,与实测结果的误差率均为5.8~6.0%之间。     

三菱Q系列PLC在电子轴凹印机的应用

电子轴凹印机的工艺较复杂,精度、速度要求高,控制难度大.三菱Q系列PLC可执行多任务操作,处理速度快,功能强,非常适用于电子轴凹印机的控制需要.由控制系统组成和工作原理展开,说明三菱Q系列PLC在电子轴凹印机的应用,包括单轴控制系统、Q系列PLC具体配置、I/O地址的分配和部分程序等内容,使整机的运动控制更加稳定可靠,...     

Rapid determination of soluble solids content and acidity of Black currant (Ribes nigrum L.) juice by mid-infrared spectroscopy performed in series

Black currant juice quality is a prime importance for growers and industrials. Such quality relies on the empirical and destructive measurements of soluble solids content and acidity. These measurements are time consuming and expensive. The serial analysis of the Black currant juice quality could allow the valuation of the product for the producer and saving of time for the manufacturer. Our objective was to develop predictive models of soluble solids content and acidity based on the mid-infrared spectroscopy performed in series.We showed that infrared spectroscopy allowed determining efficiently the quality of Black currant juices and that such technique could be performed in series. Soluble solids content were determined with a R²-value of 0.97 and an RMSECV of 1.14°Brix for a range of values comprised between 12.9°Brix and 16.42°Brix. Acidity content was determined with a R²-value of 0.96 and an RMSECV of 2.61 g L⁻¹ in a large range of values comprised between 14.87 g L⁻¹ and 36.27 g L⁻¹.These results allow asserting that the soluble solids content and the acidity of Black currant juice can be accurately determined by infrared spectroscopy. Furthermore, a large number of measures can be performed in series, what opens perspectives for a practical application.