ID 原文 译文
58758 该方法在GTX1070Ti处理器加速下, 检测速度可达18帧每秒,模型检测的准确率和召回率分别为96.8%和95. 6%。 With GPU (GTX 1070Ti) acceleration, the method works at a speed of about 20FPS and has an accuracy rate of 96. 8% and a recall rate of 95. 6%.
58759 实验结果表明,该方法可以在复杂环境下检测大疆精灵系列无人机,检测有效距离可观,相比传统算法和机器学习类特征提取算法,其处理速度和鲁棒性更佳。 The results prove that the method can detect drones in different complex backgrounds with a considerable effective detection distance. Compared with the traditional method or normal machine learning method, our method is of a certain theoretical and practical value.
58760 由于现有的超声换能器多以锆钛酸铅（Pb(Zr1−xTix)O3)和氧化锌(ZnO)材料为压电薄膜,而锆钛酸铅(PZT)含铅,氧化锌存在污染互补金属氧化物半导体制造的问题,对此设计了以氮化铝材料作为压电层的圆形双叠片弯曲振动压电超声微机械换能器。 Because existing ultrasonic transducers mostly use PZT and ZnO materials as piezoelectric thin films, while the PZT contains lead and ZnO has the problem of contaminating CMOS manufacturing, a piezoelectric ultrasonic micromechanical transducer with circular bi-laminate bending vibration which uses the aluminium nitride as the piezoelectric layer is designed.
58761 对换能器工作原理进行了分析,建立了有限元模型,针对换能器的尺寸参数进行了有限元仿真。 The working principle of the transducer is analyzed, the finite element model is established, and the finite element simulation is carried out for the size parameters of the transducer.
58762 研究发现,换能器谐振频率与各层厚度成正比,与换能器半径的平方成反比;当上电极半径为换能器半径的65%左右时,换能器的谐振振幅最大;当振动层硅和压电层氮化铝的厚度比为0.6左右时,其谐振振幅也最大。 It is found that the resonant frequency of the transducer is proportional to the thickness of each layer and inversely proportional to the square of the radius of the transducer; when the radius of the upper electrode is about 65% of the radius of the transducer, the resonant amplitude of the transducer is the largest; when the thickness ratio of the silicon and the aluminum nitride of the piezoelectric layer is about 0. 6, the resonant amplitude is also the largest.
58763 对优化后的换能器进行仿真,并与原模型进行了对比。 The optimized transducer is simulated and compared with the original model.
58764 结果表明,空气中的工作频率为9.21MHz,机电耦合系数在空气中从21.44%提高至27.16%,在水中从3.55%提高至11.93%。 The results show that the working frequency in air is 9. 21MHz, the electromechanical coupling coefficient increases from 21. 44% to 27. 16% in air and from 3. 55% to 11. 93% in water.
58765 这些结论为医疗成像探头的研究提供了基础数据。 These conclusions provide basic data for the research on the medical imaging probe.
58766 针对传统网络安全态势预测模型预测精度较低的不足,提出一种网络安全态势自适应预测模型。 Aiming at the low prediction accuracy of traditional network security situation prediction technology, a network security situation adaptive prediction model (NAP) is proposed.
58767 首先,提取警报要素并利用熵关联法计算得到网络安全态势的时间序列; First, it extracts alarm elements and calculate network security situation time sequences based on the entropy correlation method.