一种对光照变化鲁棒的移动目标前景提取方法

运动目标前景提取是对其进一步分析如特征提取、行为分析等的基础。RPCA(鲁棒主成分分析)分解可以得到较为完整的目标前景,但该方法对光照变化敏感,容易导致误检。利用Lab颜色空间中a,b通道对光照变化不敏感的特点,可以提高基于RPCA分解的前景提取方法对光照变化的鲁棒性,首先对图像L,a,b通道分别进行RPCA分解得到稀疏前景,然后利用大津阈值分割各通道二值化前景并采用种子点填充技术融合不同前景,最后利用形态学滤波优化融合结果提取准确的运动目标前景。实验结果表明,该方法可以在复杂背景下准确提取运动目标前景,且能有效克服光照变化的影响。     

基于Visual FoxPro的API抽油机的模块化设计

API系列抽油机是一种系列化、参数化、通用化的产品．有100多种型号。因此，采用模块化设计，使其由18类近100多种模块很快组合出其它型号约108种抽油机．大大地缩短设计和制造周期。其零部件具有高度的通用性、互换性．彻底地解决了各种抽油机之间换型问题．能及时满足市场的不同需求．使产品质量及数量大幅度提高．成本大幅度下降。     

Fabrication of ultrafine Nd-Fe-B powder by a modified reduction-diffusion process

In order to obtain ultrafine Nd-Fe-B powder, a spray-dried precursor was treated by reduction-diffusion (R/D) process.And, unlike the conventional R/D process, calcium reduction that is a crucial step for the formation of Nd2Fe14B was performed without conglomerating the precursor with Ca powder.By adopting this modified process, it is possible to synthesize the hard magnetic Nd2Fe14B at the reaction temperature as low as 850 ℃.The average size of Nd2Fe14B particles that are uniformly distributed in the optimally treated powder was ＜ ＜1 μm.Most Nd2Fe14B particles were enclosed with thin layers of Nd-rich phase.Typical magnetic properties of such powder without eliminating impurity CaO were iHc=～5.9 kOe, Br=～5.5 kG, and (BH)max=～6 MGOe.     

Age-hardening associated with precipitation reaction and spinodal decomposition in a commercial dental low-carat Au–Ag–Cu–Pd alloy

Two distinguishable hardening mechanisms, depending on the temperature, were found by isothermal ageing in a commercial dental low-carat Au–Ag–Cu–Pd alloy. Age-hardening was attributed to the precipitation of the metastable AuCu I and equilibrium AuCu I ordered phases and spinodal decomposition depending on the ageing temperature. It was clearly visible, by using the direct-ageing method, that the XRD peaks of the parent phases showed a shift during transformation.     

FPGA动态局部重构技术研究进展

基于现场可编程门阵列（FPGA）动态可重构系统可以实时重构硬件,提高计算的灵活性、自适应能力以及自优化能力。使用局部动态重构不仅能够保证重构过程中主系统的正常实时运行,而且可以减少重构过程的时间。然而,现有的基于FPGA的平台往往受到各种物理限制使得局部动态重构实施过程变得困难。文章介绍了目前FPGA动态局部重构技术面临的各种问题和解决方案,并对该技术的发展趋势给出了展望。     

64位Linux并行计算大气模型效率优化研究*

研究了CMAQ大气模型在64位Linux操作系统上不同CPU核心数目并行计算模拟耗时以及结果的差异情况。研究结果表明,并行计算能大幅缩短CMAQ模拟耗时,以16个CPU核心并行处理为性价比最佳值;此时连续模拟中国区域37天空气质量状况（分辨率36 km、167行×97列、垂直14层）平均耗时小于16 min/d,而相同情况下单核模拟耗时大于2 h/d;多于16个核心并行处理时,随核心数量的增加模型性能提升的趋势减缓;操作系统和参与运算的核心数目对CMAQ模型模拟结果没有影响。     

Design of 1 kbit antifuse one time programmable memory IP using dual program voltage

A 1 kbit antifuse one time programmable (OTP) memory IP, which is one of the non-volatile memory IPs, was designed and used for power management integrated circuits (ICs). A conventional antifuse OTP cell using a single positive program voltage (V _PP) has a problem when applying a higher voltage than the breakdown voltage of the thin gate oxides and at the same time, securing the reliability of medium voltage (V _M) devices that are thick gate transistors. A new antifuse OTP cell using a dual program voltage was proposed to prevent the possibility for failures in a qualification test or the yield drop. For the newly proposed cell, a stable sensing is secured from the post-program resistances of several ten thousand ohms or below due to the voltage higher than the hard breakdown voltage applied to the terminals of the antifuse. The layout size of the designed 1 kbit antifuse OTP memory IP with Dongbu HiTek’s 0.18 μm Bipolar-CMOS-DMOS (BCD) process is 567.9 μm×205.135 μm and the post-program resistance of an antifuse is predicted to be several ten thousand ohms.     

MARC在接触分析中的应用

介绍了MARC软件的各部分组成及其非线性分析功能的特点，并以圆柱接触为例，将MARC有限元分析结果与赫兹理论进行了比较，两者吻合得比较好，这为MARC软件在求解诸如轴承分析、铁轨分析和橡胶密封等方面开辟了很好的应用前景。     

一种通用型喷油器的改进设计

本文介绍了一种通用型喷油器总成的改进与应用。通过产品的批量生产和在发动机上的试验验证,改进后的喷油器可以与改进前的喷油器互换,其产品具有良好的通用性,达到了节约成本、宜批量组织生产的目的。     

Process analysis of direct laser melting to fabricate layered hybrid beads

The successful fabrication of layered hybrid beads by DLM process is limited by dissimilar melting ranges of different powders.For the application of DLM process into manufacturing industries,target mechanical properties of final product must be achieved.Process analysis was performed for the DLM fabrication of layered hybrid beads by using stainless steel (SS 316L) and titanium powders.For the analysis of fabrication characteristics,single hybrid bead was formed using SS316L powder onto the base plate and then Ti powder was melted onto the previous melted layer.In addition,multi-layer hybrid beads were fabricated for the analysis of the layering effects between them.From these studies,the effects of the processing parameters,such as laser power,scan rate and scan line spacing on surface morphology were characterized and optimum processing conditions for the DLM fabrication of layered hybrid beads were developed.