基于随机开关喷孔数量的3D错位打印研究及应用

3D打印机打印过程是逐层堆砌打印,在实际的工业生产中,打印机喷头经常会出现部分喷孔堵塞,无法喷墨的情况,导致打印的零部件在层叠加方向上堵塞喷孔的部位始终无法喷洒粘接剂造成断裂面而成型失败。目前只能清理喷孔后再重新打印或更换喷头解决上述问题,但是会造成喷头使用寿命减短、生产效率降低、成本增加等问题。通过随机开关部分喷孔和打印头偏移相结合的方式可以有效的避免因少量喷孔堵塞而导致的打印零部件断裂报废的问题,也可延长喷头使用寿命。从而使得3D打印在生产制造领域使用的更加得心应手。     

盖下坝水电站坝址区岩溶发育情况初步分析

盖下坝水电站工程为高山峡谷型电站,坝址区及附近岩石为碳酸盐岩,属中等坚硬易溶岩.岩溶发育是影响本工程库水外渗的重大工程地质问题之一.从施工开挖揭示的各种溶蚀现象中分析岩溶发育特征及其规律,为防渗设计提供依据.     

多场景视频监控中的人物连续跟踪

针对多场景监控,提出一种能在非重叠的多摄像机之间,实时地检测与被跟踪行人（目标）的视频监控系统。该系统分别对每个摄像机视频进行背景建模、前景检测以及运动目标的特征提取,当目标离开摄像机视域的时候,根据已知的拓扑关系向相关摄像机发布监控任务,当有目标进入处于有效监控状态的摄像机视域时,进行目标匹配,从而实现在多摄像机系统中对行人目标的持续跟踪。实验表明,该系统在非重叠摄像机场景中能实现实时的、鲁棒的目标跟踪。     

一种面向中小企业PDM系统的设计与实现

根据中小企业在信息化建设中对于产品数据管理的实际需求,针对某一具体行业设计了一个适合中小企业的产品数据管理系统。分析系统的开发平台和采用基于．Net框架下采用B／S模式的系统结构,阐述系统具有的图档管理、产品结构和配置管理、项目管理和安全管理等主要功能。应用结果表明,该系统能有效地提高企业对产品数据管理的效率。     

Scalable Video Multicast Using Expanding Window Fountain Codes

Fountain codes were introduced as an efficient and universal forward error correction (FEC) solution for data multicast over lossy packet networks. They have recently been proposed for large scale multimedia content delivery in practical multimedia distribution systems. However, standard fountain codes, such as LT or Raptor codes, are not designed to meet unequal error protection (UEP) requirements typical in real-time scalable video multicast applications. In this paper, we propose recently introduced UEP expanding window fountain (EWF) codes as a flexible and efficient solution for real-time scalable video multicast. We demonstrate that the design flexibility and UEP performance make EWF codes ideally suited for this scenario, i.e., EWF codes offer a number of design parameters to be ldquotunedrdquo at the server side to meet the different reception criteria of heterogeneous receivers. The performance analysis using both analytical results and simulation experiments of H.264 scalable video coding (SVC) multicast to heterogeneous receiver classes confirms the flexibility and efficiency of the proposed EWF-based FEC solution.     

Java程序设计课程的案例设计

解释了"项目驱动、案例教学、理论实践一体化"教学方法的基本思路,给出了Java程序设计课程的案例设计.     

Fast medical concept normalization for biomedical literature based on stack and index optimized self-attention

Neural Computing and Applications - Medical concept normalization aims to construct a semantic mapping between mentions and concepts and to uniformly represent mentions that belong to the same...