基于笔画滤波的维吾尔文视频文字定位算法

由于维吾尔文自身的特点,大多数已发表过的算法不能直接应用到视频中的这类文字。首先对视频帧的笔画滤波响应做全局阈值处理,然后利用维吾尔文在基线上横笔画居多的特征,通过水平投影找到基线位置,在基线上下方确定上下文本线。最后用垂直投影和启发式规则确定文本框。实验结果表明该算法对这类文字比较有效。     

麦克风阵数字助听器实验平台研究与设计

随着现代数字信号处理技术的发展,数字助听器已经基本成为助听器的主流.在综合考虑助听器实时性及功耗,大小等诸多要求后,提出利用麦克风阵列改善助听器听觉效果,设计了基于麦克风阵列的数字助听器系统开发平台.平台以DSP芯片TMS320C6747为核心CPU,TLV320A1C32为音频AD采样芯片.在该平台上,对声源定位算法...     

艾萨炉燃油喷枪系统的国产化

为了满足工程需要,通过对艾萨炉燃油喷枪系统进行设计优化和制造工艺优化,提高传动部件效率,并进行材料转换选用,成功实施了对艾萨炉燃油喷枪系统的国产化,国产燃油喷枪系统的喷枪比进口喷枪使用寿命提高2倍,设备投资节约一半以上。     

砂轮锯主轴国产化改造

介绍了石钢公司连轧线砂轮锯主轴的使用情况和工作原理,分析了主轴的结构,采用理化实验、测绘、计算等方法对主轴进行国产化改造,提高了砂轮锯主轴的使用寿命和运行稳定性。     

高精度差分GPS在隐伏矿床定位预测中的应用

文章介绍了GPS系统的组成、定位原理、技术特点等;针对传统测量方法效率低下、GPS手持机精度较低难以运用在隐伏矿床的定位预测工作中等特点,探讨了高精度差分GPS在隐伏矿床定位预测中有关矿区大比例尺地形地质图的绘制、物化探网点放样、地质剖面图的绘制、异常检查、工程验证点位确定、标定地质点等方面的应用及注意事项;通过三种方法比较和矿区的找矿实践,认为高精度差分GPS在隐伏矿床定位预测中能发挥很好的效果,值得推广。     

应变率对Mg-Gd-Y合金断裂机制的影响

对Mg-Gd-Y合金分别使用准静态压缩试验机、分离式霍普金森压杆、平头弹丸侵彻加载,研究了该合金在1×10-3,1×103,1×104s-1时,应变率对其断裂机制的影响.研究结果表明,在应变率为1×10-3 s-1时,呈现出脆性解理断裂特征;当应变率增加为1×103 s-1时,动态压缩后断口除了解理片层外,还出现了热软化带,变形局域化是裂纹形核的通道,最终导致材料的失效.在应变率约为1×104 s-1时,稳定侵彻阶段,绝热剪切带是更高应变率下导致材料断裂的原因,特定位置的绝热剪切带为相变带,应变率的提高有利于形成相变带.应变率是通过影响Mg-Gd-Y合金的热软化效果而影响其断裂机制的.     

Cooperative localization techniques for wireless sensor networks: free,signal and angle based techniques

This paper addresses the problem of localization in sensor networks where, initially, a certain number of sensors are aware of their positions (either by using GPS or by being hand‐placed) and are referred to as anchors. Our goal is to localize all sensors with high accuracy, while using a limited number of anchors. Sensors can be equipped with different technologies for signal and angle measurements. These measures can be altered by some errors because of the network environment that induces position inaccuracies. In this paper, we propose a family (AT‐Family) of three new distributed localization techniques in wireless sensor networks: free‐measurement (AT‐Free) where sensors have no capability of measure, signal‐measurement (AT‐Dist) where sensors can calculate distances, and angle‐measurement (AT‐Angle) where sensors can calculate angles. These methods determine the position of each sensor while indicating the accuracy of its position. They have two important properties: first, a sensor node can deduce if its estimated position is close to its real position and contribute to the positioning of others nodes; second, a sensor can eliminate wrong information received about its position. This last property allows to manage measure errors that are the main drawback of measure‐based methods such as AT‐Dist and AT‐Angle techniques. By varying the density and the error rate, simulations show that the three proposed techniques achieve good performances in term of high accuracy of localized nodes and less energy consuming while assuming presence of measure errors and considering low number of anchors. Copyright © 2012 John Wiley & Sons, Ltd.     

Molecular characterization of tob1 in muscle development in pigs

Cell proliferation is an important biological process during myogenesis. Tob1 encoded a member of the Tob/BTG family of anti-proliferative proteins. Our previous LongSAGE (Long Serial Analysis of Gene Expression) analysis suggested that Tob1 was differentially expressed during prenatal skeletal muscle development. In this study, we isolated and characterized the swine Tob1 gene. Subsequently, we examined Tob1 chromosome assignment, subcellular localization and dynamic expression profile in prenatal skeletal muscle (33, 65 and 90 days post-conception, dpc) from Landrace (lean-type) and Tongcheng pigs (obese-type). The Tob1 gene was mapped to pig chromosome 12 (SSC12). The Tob1 protein was distributed throughout the nucleus and cytoplasm of PK15 cells. During prenatal skeletal muscle development, Tob1 was up-regulated and highly expressed in skeletal muscle at 90 dpc in Tongcheng pigs but peaked at 65 dpc in Landrace pigs. This result suggested that there were different proliferation patterns during myogenesis between Tongcheng and Landrace pigs. During postnatal skeletal muscle development, the expression of Tob1 increased with aging, indicating that the proliferation potential of myoblasts decreased in postnatal muscle development. In tissues of adult wuzhishan miniature pigs, the Tob1 gene was highly expressed in skeletal muscle. The expression of Tob1 was significantly increased at day 6 during C2C12 differentiation time, suggesting a possible role in skeletal muscle development. Therefore, this study indicated that Tob1 perhaps played an important role in skeletal muscle development.     

基于信息融合的运动目标跟踪算法

针对复杂背景下目标遮挡后跟踪不稳定的问题,提出了一种在粒子滤波框架下融合异类信息进行目标跟踪的算法.该方法建立了声源特征模型和颜色特征模型,在此基础上将声音信息和图像的颜色信息融合到粒子滤波跟踪算法中,通过粒子更新策略实现跟踪.实验结果表明与基于单一特征的跟踪算法相比均方误差降低了18.3%.在低信噪比情况下,该算法更...