生物测定学是一种非常复杂的技术,因此对身份确认过程要比其他类型更为昂贵和复杂。生物测定学系统能够基于个人的行为(如动态签名)作出身份验证决策,但是这些行为可能随着时间推移而被改变或伪造。
【大数据】科技经济舆情聚合监测平台显示":载人飞船"1年来累计相关报道19205篇,点击量6537116次,评论数69040条,关注网站1094家。其中网媒14401篇(省内454篇,省外13049篇,境外898篇),论坛825篇,平媒1919篇,政府网站317篇,博客95篇,微信1472篇,微博2篇,视频174篇。【研判】载人飞船又称宇宙飞船,是保障航天员在外层空间和工作并返回地面的航天
Computed tomography has been proven to be useful for non-destructive inspection of structures and materials. We build a three-dimensional imaging system with the photonically generated incoherent nois
The South China Sea(SCS) and the Arabian Sea(AS) are both located roughly in the north tropical zone with a range of similar latitude(0°–24°N). Monsoon winds play similar roles in the upper oceanic ci
The typhoon,as a mature tropical cyclone that develops in the western part of the North Pacific Ocean with high wind speed and heavy rainfall,is one of the most lethal and costly of natural disasters
The eddy tracking approach is developed using the global nearest neighbor filter(GNNF) to investigate the evolution processes and behaviors of mesoscale eddies in the South China Sea(SCS). Combining t
Since the atmospheric correction is a necessary preprocessing step of remote sensing image before detecting green tide, the introduced error directly affects the detection precision. Therefore, the de
在激光阵列辅助下,基于立体成像计算机视觉建立了一套非接触多点波高测量系统(NIFSM),根据自适应均值方法改进了激光光斑筛选匹配算法.根据圆柱绕射波面仿真结果制作了3D打印模型,对模型测量结果的对比表明所发展的测量系统和算法可行有效并具有较高的精度.针对实际问题,在波浪水槽中测量了规则波圆柱绕射波面,将圆柱周围多点测量值与电容式浪高仪测量结果对比,波高和周期均吻合良好,最大相对误差小于5%,实验结
To overcome the shortcomings of the traditional passive ranging technology based on image, such as poor ranging accuracy, low reliability and complex system, a new visual passive ranging method based
The soil moisture movement is an important carrier of material cycle and energy flow among the various geo-spheres in the cold regions.Thus, this research takes the north slope of Bayan Har Mountains