Interoperability for Elearning Services Management and Provision

Learning Objects offer flexibility and adaptability for users to request personalised information for learning. There are standards to guide the development of learning objects. However, individual developers may customise these standards for serving different purposes when defining, describing, managing and providing learning objects, which are normally stored in heterogeneous repositories. Barriers to interoperability hinder sharing of learning services and subsequently affect quality of instructional design as learners expect to be able to receive their personalised learning content. All these impose difficulties to the users in getting the right information from the right sources. This paper investigates the interoperability issues in elearning services management and provision and presents an approach to resolve interoperability at three levels.     

基于数据驱动的PID自整定算法研究

文章主要研究了基于数据驱动的PID自整定算法及软件实现问题,包括经典的辨识方法和PID整定算法研究、基于数据驱动的辨识方法和整定算法研究,以及基于数据驱动的PID自整定软件的实现.PID整定过程中现场有大量的操作数据存在着很多重要的频率特性,传统的PID整定技术以给定试验信号为基础,不能很好的利用这些历史数据,文章在介绍和分析经典PID整定技术的基础上,利用历史数据完成数据驱动辨识方法研究,以灵敏度为性能指标研究PID自整定算法,并通过0PC接口采集数据完成基于数据驱动的PID自整定软件实现.     

我就喜欢PS数码照片

DC可以随心所欲地狂拍，有利有弊，弊是拍摄前不去仔细构图就按下快门。摄影构图经驻不丰富的DC FANS便会拍出杂乱的风景，或许眼前凡景太差，想尽量多地摄入镜头，或许由于DC的变焦倍数有限，不能达到很理想的构图，此时数码照片的后期裁切构图显得尤为重要了。     

达伦·斯塔尔和他“湿润的户外起居室”

在剧中斯塔尔将主人公生活环境刻画得精美极致,现实中的他对自己也是同样的要求。闲暇时,斯塔尔最喜欢呆在洛杉矶的私人别墅中,与家人一起享受着那份恬静和惬意。