基于Pro/E二次开发的模型抽取技术

为了实现从复杂的装配体中抽取部分零部件进行CAE分析,同时保持被抽取零部件的空间位置关系不变。利用VC2005开发环境和Pro/E自带的Pro/ToolKit开发模块进行二次开发,在Pro/E非可视化的条件下将Pro/E模型导入内存,重新组合生成新装配体进行实时预览,并将预览合适的新装配体按照指定文件格式保存。结合虚拟火箭案例,验证了复杂模型抽取的可行性和实用性,提高了分析模型抽取、装配的效率和通用性。     

无线电管理系统集成项目集成管理

该文从信息系统集成项目管理的基础理论和方法出发,以江苏省无线电管理局电磁频谱监管中心系统集成项目为案例,在充分了解无线电管理系统的现状及项目目标的基础上,分析现有的项目管理方法与手段,明确无线电管理项目在实际进展过程中的具体需求与建设内容,对无线电管理系统集成项目进行分析,为无线电管理系统集成的项目建设提供一定的借鉴作用.     

APT多维度分析和防御研究

“APT多维度分析及防御研究”需要遵循两大原则,即“广谱检测”和“精准定位”的策略。所谓“广谱检测”就是设计的检测方法不局限适用于某一特定的类型的僵尸网络、木马或者蠕虫。“精准定位”就是要求检测结果具有较高的准确性,不仅能确定有无,还要定位感染主机。为了满足上面两个原则,需要将多种检测方法整合到一起,多种检测方法在功能上互相补充,在结果上互相印证,才能获得较理想的结果。     

Room-Temperature Metal-Catalyzed Ultrafast Gasification of Ultrathin Boron Flakes

The trivalent outer shell of boron renders this element electron-poor but chemically rich, exhibiting more than one dozen allotropes. Its 2D polymorph has been recently synthesized on metal substrates under ultrahigh vacuum and has attracted intense interest. However, probing its properties ex situ has been challenging due to the quality degradation—surface oxidation—that occurs upon exposure to ambient environments. Herein, this surface chemistry is investigated in regard to the air stability of ultrathin boron flakes on metals prepared by atmospheric-pressure chemical vapor deposition. The characteristic Volmer–Weber growth is recognized by the stacking of polygon-shaped, thin flakes as isolated islands. Significantly, the metal-catalyzed, ultrafast gasification of boron flakes at room temperature, exemplified by the complete, spontaneous vanishment of 200 nm-thick boron islands in 3 h is observed. A two-step mechanism, first oxygen-involved surface oxidation and then subsequent reactions with water forming a highly volatile boric acid layer, is unambiguously revealed by combined surface characterizations. The catalysis by metal substrates, corroborated by theoretical calculations, is attributed as the crucial cause of the unprecedented gasification. The concept of oxygen-free growth is thereby proposed for air-sensitive material growth by introducing in situ oxygen scavengers. These findings significantly expand the fundamental understanding of the surface chemistry of boron and pave the way for the chemical vapor deposition growth of hydrophobic materials.     

Three-dimensional expression of adhesion molecules on the superficial synovial intima of LPS-induced arthritis of the mouse knee analyzed by immuno-SEM

Three-dimensional microlocalization of adhesion molecules, i.e. ICAM-1 (intercellular adhesion molecule), VCAM-1 (vascular adhesion molecule), LFA-1 (lymphocyte function-associated antigen), Mac-1 (macrophage differentiation antigen) and VLA-4 (very late activation antigen), expressed on type-A synoviocyte (macrophage-like cell) and type-B synoviocyte (fibroblast-like cell), were detected by immuno-scanning electron microscopy (SEM) to investigate the immunoreactive microenvironment of the superficial synovial intima in lipopolysaccharide (LPS)-induced arthritis of the mouse knee. Type-B synoviocytes extended rich slender processes from the periphery and constructed a cytoplasmic network, to which ICAM-1 was restricted. VCAM-1 was expressed only in the LPS-stimulated group and was relatively limited to the microvilli of type-B synoviocytes. Type-A synoviocytes were located randomly among the network with a smoother surface and expressed Mac-1 and LFA-1, which were counter-receptors for ICAM-1, and VLA-4 for VCAM-1 on the microvilli or lamellipodia. Three-dimensional microlocalization of adhesion molecules suggests that the network constructed by cytoplasmic processes and microvilli of type-B synoviocytes forms the pathway for the migration or the foothold for the fixation of type-A synoviocytes and takes part in forming an immunoreactive environment in the articular cavity.     

基于协作通信系统的中继选择方案的研究

本文研究基于两跳的协作通信系统中的中继选择问题.为了降低中断概率,传统中继选择方案往往需要引入更多的中继节点参与协作传输,导致系统平均吞吐量下降.为解决上述问题,本文提出了一种新的自适应中继选择方案(ARSS),此方案可以结合两跳的链路信道状况,自适应地选择中继节点及其转发协议.仿真结果表明,与其他中继选择方案相比,本...     

基于TMS320C642电子稳像算法的实现

介绍了一种解决视频图像抖动问题的电子稳像方法,系统利用灰度投影算法和德州仪器公司的定点数字信号处理器芯片TMS32ODM642实现电子稳像.文中提出了电子稳像性能的基本要求,介绍了稳像的基本原理,根据要求选择了稳像算法,从而设计了系统的硬件框图,并完成了算法的仿真.实验结果表明,该算法稳效果好,且达到准确性要求.     

基于WEB3.0的高校学生工作网络平台构建研究

Web3.0建立在Web2.0的基础之上,是一个无限渗透的智能化和个性化网络。其具有的跨平台、跨语种等特点,为信息化的学生工作提供了保障。本文通过分析Web3.0相关技术为高校学生工作网络平台构建的影响,探讨基于Web3.0的高校学生工作网络平台的构建及其所实现的功能。     

移动Ad Hoc网络的安全体系结构研究

移动Ad Hoc网络是一种特殊的自组织无中心多跳的无线网络，网内节点所具有的移动和分布特性使得安全成为网络设计的重点。本文首先对移动Ad Hoc网络的特点进行了介绍，然后结合移动Ad Hoc网络的特点分析了移动Ad Hoc网络面临的安全威胁，最后从系统体系结构的角度对移动Ad Hoc网络的安全问题进行了详细讨论。     

语音合成ASIC的原理与设计方法

本文阐述了语音合成专用集成电路(ASIC)的数字信号处理原理.采用波形自适应增量调制编码方法,研究并解决了语音信号的压缩与加密.用半定制标准单元CAD设计方法,CMOS工艺,完成了32K ROM 6秒语音ASIC芯片的设计.