一体化生产管理系统炼钢计划子系统设计

概述了炼钢—连铸—热轧一体化生产管理系统的设计方案,采用软件工程方法开发炼钢计划与实绩管理子系统,简要介绍了子系统功能构成及动态调整设计．实验室模拟运行效果良好．     

BF518嵌入式处理器的串口扩展及驱动程序设计

ADI公司Blackfin系列BF518处理器,采用uClinux作为嵌入式操作系统有着很大的优势和发展前景,而在uClinux下进行外围设备扩展的设备驱动程序开发又是系统开发的一个重点,该文结合16C2552串口扩展对linux下设备驱动程序开发作了详细的介绍。     

基于加气站槽车调度的模型建立与算法研究

通过对CNG的发展形势介绍,深入到要研究的具体问题——槽车调度,槽车调度就是加气站母站向子站调度发送槽车。匈牙利算法是用到线性规划上解决最优化最优解的问题。考虑到槽车调度优化的问题的特殊性,因此在匈牙利算法的思想基础上,提出了最大差值法。此方法能更高效率地运算出最优解。     

Fuzzy uncertainty modelling for project planning: application to helicopter maintenance

Maintenance is an activity of growing interest, especially for critical systems. In particular, aircraft maintenance costs are becoming an important issue in the aeronautical industry. Managing an aircraft maintenance centre is a complex activity. One of the difficulties comes from the numerous uncertainties that affect the activity and disturb the plans in the short and medium term. Based on a helicopter maintenance planning and scheduling problem, we study in this paper the integration of uncertainties into tactical and operational multi-resource, multi-project planning (respectively Rough Cut Capacity Planning and the Resource Constraint Project Scheduling Problem). Our main contributions are in modelling the periodic workload on a tactical level considering uncertainties in macro-task work content, and modelling the continuous workload on the operational level considering uncertainties in task duration. We model uncertainties using a fuzzy/possibilistic approach instead of a stochastic approach since very limited data are available. We refer to the problems as the Fuzzy Rough Cut Capacity Problem (FRCCP) and the Fuzzy Resource Constraint Project Scheduling Problem (RCPSP). We apply our models to helicopter maintenance activity within the frame of the Helimaintenance project, an industrial project approved by the French Aerospace Valley cluster that aims at building a centre for civil helicopter maintenance.     

Day of the week lost time occupational injury trends in the US by gender and industry and their implications for work scheduling

While there is a growing body of research on the impact of work schedules on the risk of occupational injuries, there has been little investigation into the impact that the day of the week might have. The present research was completed to explore day of the week trends, reasons for such trends and the corresponding implications for work scheduling. Data for the number of injuries and illnesses involving days away from work (lost time; LT) in 2004 were provided by the US Bureau of Labor Statistics Office of Safety and Health Statistics. Data from the American Time Use Survey database were used to estimate work hours in 2004. From these two data sources, the rate of LT injuries and illnesses (per 200 000 work hours) by day of the week, industry sector and gender were estimated. The analysis revealed clear differences by day of the week, gender and major industry sector. Sundays had the highest rate overall – nearly 37% higher than the average of the remaining days, Monday to Saturday. Mondays had the next highest rate followed closely by Saturdays. This pattern was not the same for males and females. For males, Mondays had the highest LT rate (27% higher than the average of all other days) with all remaining days having essentially the same rate. For females, Sundays and Saturdays had much higher LT rates – 122% and 60% higher, respectively, than the average weekday rate. There were also differences by industry and differences between genders by industry. The present analysis suggests that several factors may be contributing to the weekend and Monday trends observed. Lower-tenured (and younger) workers on the weekends, lower female management/supervision and second jobs on the weekend seem to be contributors to the high Saturday and Sunday LT rates. Differences in day of the week employment by industry did not account for the trends observed. Fraud and overtime also could not be confirmed as contributing to these trends. Monday trends were more complex to explain, with possible explanations including non-work-related weekend injuries being reported on Mondays, soft-tissue symptoms becoming more noticeable on Mondays, greater Monday morning flexion risk and reduced supervision in the construction industry on Mondays. Interpretation of these trends and the implications for work scheduling are discussed.     

加工时间线性递减的链约束单机排序问题

讨论了工件的加工时间是开工时间的线性递减函数、工件之间有平行链约束的单机排序问题.对于链可中断和不可中断两种情况,给出了极小化总完工时间的最优算法.     

烟气污染物协同治理中的负协同效应串联作用现象

随着烟气污染物协同治理技术在燃煤电站的普遍应用,协同治理过程中各单元设备间的不良影响及其造成的设备治理能力下降或污染物增量排放现象日益显现,对此类负协同效应展开分析,并通过性能试验、检测化验、运行诊断等方法对某350 MW机组进行研究,结果表明：存在负协同效应串联作用现象,即上游设备的负协同效应不断蚕食本体或下游设备的污染物治理能力,最终导致设备治理能力不足。最后,提出控制及消纳负协同效应的建议。     

基于多核DSP架构的机械相控阵任务调度

相控阵雷达的任务调度是影响相控阵雷达整体效能的关键因素,应根据雷达搜索和跟踪模式的不同需求,需要对计算资源进行有效调度。对于机械旋转相控阵雷达而言,其额外增加的机械约束特征决定了调度过程本身也需要大量计算资源。基于多核DSP并行结构对旋转相控阵雷达任务规划进行了不同资源的优化。模拟运行数据表明,基于多核DSP调度的架构可在有效实现基于预估计的任务调度过程,提高系统层面雷达任务管理的调度效率。     

Jitter tolerance calibration for high-speed serial interfaces

A jitter tolerance calibration test bench suitable for high speed serial interfaces (HSSI) using verilog-AMS is proposed in this paper. The jitter tolerance simulation environment can be easily parameterized in order to be compliant to any HSSI standard specification. As an example, the proposed solution is applied for the jitter tolerance simulation and characterization of the most updated M-PHY ver.3 HSSI standard for mobile applications. A comprehensive method for the calculation of the jitter noise frequency ingredients and the calibration of jitter noise sources is also proposed resulting a jitter tolerance mask compliant with the M-PHY ver.3 specifications. Using the proposed implementation the transistor level and behavioral modules co-simulation time could be significantly minimized.     

六安有线宽带管理系统的设计与实现

通过对六安有线宽带业务流程调研与分析,运用Workflow和SMS技术,实现了一个基于C/S架构的、与SMS短信平台无缝集成的有线宽带管理系统,以期实现对宽带业务的有效处理,提高工单作业调度的执行效率和准确度。