基于视频摘要的智能视频识别系统的设计与实现

随着计算机科学技术的迅猛发展和多媒体技术的广泛应用,监控视频已经成为日常生活中不可或缺的一部分。文章首先介绍了目前视频摘要和智能视频识别技术的研究背景,接着对智能视频识别系统进行了需求分析,阐述了各模块的功能。然后根据系统的需求分析结果,对系统进行了总体设计,说明了各功能模块的工作流程。最后采用Visual C++和DirectShow对系统进行了实现,详细地阐述了视频摘要模块的实现过程。     

梯形悬臂梁结构能量收集器的设计与研究

传统矩形悬臂梁上的应力呈非均匀分布,在梁固定端存在一个应力集中区,且沿轴向方向衰减,从而影响压电层的极化效果。同时,矩形悬臂梁结构能量收集器的谐振频率较高。为解决这一问题,文章提出了一种“倒”梯形结构的能量收集器结构。该梯形结构可以有效扩展极化区域,从而捕获到更低频的振动能量。实验发现,在1g振动加速度下,该能量收集器在124 Hz下输出电压为404 mV,输出功率达到41.3 μW。     

Image Independent Driving Power Reduction for High Frame Rate LCD Televisions

In this letter, the constant driving power reduction ratio has been achieved for column drivers regardless of the input image by incorporating a new static power reduction scheme into the previous dynamic power reduction method. The measured power reduction ratio is around 50% for a 120 Hz liquid crystal display panel in such cases of still input video and fallback.     

A 3D mesh deformation technique for irregular in‐flight ice accretion

Aircraft holding around busy airports may be requested to sustain as much as 45 min of icing before landing or being diverted to another airport. In this paper, a three‐dimensional mesh deformation scheme, based on a structural frame analogy, is proposed for the numerical simulation of ice accretion during extended exposure to adverse weather conditions. The goal is to provide an approach that is robust and efficient enough to delay or altogether avoid re‐meshing while preserving (enforcing) nearly orthogonal elements at the highly distorted ice surface. Robustness is achieved by suitably modifying the axial and torsional stiffness components of the frame elements in order to handle large and irregular grid displacements typical of in‐flight icing. Computational efficiency is obtained by applying the mesh displacement to an automatically selected small subset of the entire computational domain. The methodology is validated first in the case of deformations typical of fluid‐structure interaction problems, including wing bending, a helicopter rotor in forward flight, and the twisting of a high‐lift wing configuration. The approach is then assessed for aero‐icing on two swept wings and compared against experimental measurements where available. Copyright © 2015 John Wiley & Sons, Ltd.     

一种基于累加支路辅助的上面级跟踪切换方案

为了满足火箭上面级测控下行信息量增大的特殊要求,借鉴等时性插入业务的思想设计了一种新的适应于上面级测控的信息帧格式。在此基础上,提出了这种帧格式下的跟踪方案,设计利用二阶环路滤波器累加支路输出辅助伪码跟踪环与位同步环的切换。根据推导出的比例因子,仿真了其性能。仿真结果表明,这种切换方式可以实现平滑过渡,性能良好。     

Oxidation of Lead Frame Copper Alloys with Different Compositions and Its Effect on Oxide Film Adhesion

Oxidation of four typical lead frame copper alloys was investigated. The oxidation rate and adhesion strength of oxide films to copper alloy substrates were studied by measuring the thickness and carrying out peel tests. The results show that, although copper alloys C5191 and C7025 have thinner oxide films, a lower adhesion strength and a higher proportion of CuO were obtained than in the other copper alloys EFTEC64T and C194. The adhesion strength is mainly influenced by the structure of the oxide film of the copper alloys, especially the CuO/Cu₂O ratio in the film. The highest adhesion strength is obtained for the copper oxide film with a basic structure of CuO/Cu₂O/Cu and a CuO/Cu₂O ratio of about 0.1. The segregation of additional elements in the copper alloy plays an important role in the oxide film structure.     

格林互易定理在求解均匀带电圆环的静电势分布中的应用

对于静电场,由普遍的格林互易定理得出特殊情形下的格林互易定理.应用该定理推导出均匀带电圆环的数种在形式上互不相同的静电势分布解式.     

武进广电呼叫服务中心的规划与实施

介绍武进呼叫服务中心的框架结构以及对用户来电的流程处理，介绍新建呼叫服务中心时应如何选择和培训呼叫服务人员，总结武进呼叫服务中心在运营管理方面注重的几个要点，并对呼叫服务中心的未来发展提出设想。     

Fixed-Point Iterations for Asymptotically Nonexpansive Mappings in Banach Spaces

In this paper, we suggest and analyze a three-step iterative scheme for asymptotically nonexpansive mappings in Banach spaces. The new iterative scheme includes Ishikawa-type and Mann-type interations as special cases. The results obtained in this paper represent an extension as well as refinement of previous known results.