动态工作流的进化策略

大型分布式系统工作流具有动态、分布、松散耦合特点。系统在维护工作流正常运行同时,还能根据实时情况分析,对工作流进行在线进化,从而构造更优流模型。对原工作流定义进行了可行替换集扩展,并给出了兼顾组合预算、任务时限以及服务信用等各因数的综合评分函数,对XML标准流日志进行在线应用挖掘,由管理Agent对工作流重新配置,实现流中变迁的替换、归并和分裂等进化操作,使其保持综合评分最优,为虚拟企业工作流管理提供进化支持。     

Characteristics of the spatiotemporal distribution of daily extreme temperature events in China: Minimum temperature records in different climate states against the background of the most probable temperature

Based on the skewed function,the most probable temperature is defined and the spatiotemporal distributions of the frequencies and strengths of extreme temperature events in different climate states over China are investigated,where the climate states are referred to as State I,State II and State III,i.e.,the daily minimum temperature records of 1961-1990,1971-2000,and 1981-2009.The results show that in space the frequency of high temperature events in summer decreases clearly in the lower and middle reaches of the Yellow River in State I and that low temperature events decrease in northern China in State II.In the present state,the frequency of high temperature events increases significantly in most areas over China except the north east,while the frequency of low temperature events decreases mainly in north China and the regions between the Yangtze River and the Yellow River.The distributions of frequencies and strengths of extreme temperature events are consistent in space.The analysis of time evolution of extreme events shows that the occurrence of high temperature events become higher with the change in state,while that of low temperature events decreases.High temperature events are becoming stronger as well and deserve to be paid special attention.     

基于毫米波雷达的多功能驱鸟装置设计

多功能驱鸟装置以STM32为主控模块,两处串口控制音频模块、4G模块,2处I/O口控制驱鸟剂释放,PWM改变超声波模块频率,毫米波雷达模块自监控,通过SPI与外部主控模块进行控制连接。其中,毫米波雷达作为感知手段,用于感应鸟类接近的距离。当距离在预警范围内,则通过音频模块,超声波模块发出随机声音及超声波,同时释放驱鸟剂,多重手段驱赶鸟类。成功触发三种驱鸟方式,将数据打包成输电I1报文格式,通过4G模块发送至服务器。基于毫米波雷达的多功能驱鸟装置,准确感应鸟类,通过多种手段驱赶鸟类,有效保障输电杆塔运维安全,使用输电I1报文,统一输电接口规范,便于接入国网内网。     

海气随机气候模式及其应用

基于能量平衡气候模式,考虑了随机力对海-气相互作用的影响和不同时空尺度耦合的作用,将描写海温和气温交互作遥随机动力模式化为一个Fokker-Planck方程,然后用矩阵连分法进行求解,并对CO     

基于有限自动机的Web服务行为的描述与发现

Web服务技术越来越成为应用和研究的热点,对Web服务的行为描述的几种方案进行比较分析,推荐了对原有限自动机定义进行扩展的方法,以达到准确地描述Web服务间的执行步骤和相互作用的目的。