NIST(National Institute of Standards and Technology) statistical test recognized as the most authoritative is widely used in verifying the randomness of binary sequences. The Non-overlapping Template Matching Test as ...NIST(National Institute of Standards and Technology) statistical test recognized as the most authoritative is widely used in verifying the randomness of binary sequences. The Non-overlapping Template Matching Test as the 7 th test of the NIST Test Suit is remarkably time consuming and the slow performance is one of the major hurdles in the testing process. In this paper, we present an efficient bit-parallel matching algorithm and segmented scan-based strategy for execution on Graphics Processing Unit(GPU) using NVIDIA Compute Unified Device Architecture(CUDA). Experimental results show the significant performance improvement of the parallelized Non-overlapping Template Matching Test, the running speed is 483 times faster than the original NIST implementation without attenuating the test result accuracy.展开更多
Framework and basic parameters of a test bench for motor drive system of electric vehicle (EV) are illuminated. Two kinds of electric drive models, one was for the electric vehicle drived on real road, the other was f...Framework and basic parameters of a test bench for motor drive system of electric vehicle (EV) are illuminated. Two kinds of electric drive models, one was for the electric vehicle drived on real road, the other was for that on test bench, are put forward. Then, dynamic analysis of these models is made in detail. Inertia matching method of the test bench is researched and some useful formulas and graphs are brought forward. The experiment of an electric bus is introduced in order to explain the usage of this inertia matching method.展开更多
电磁无损检测(Non-Destructive Testing,NDT)是一种非侵入型介质内部信息检测与评估方法,广泛应用于生物医学检测、建筑内部损伤探测与定位、地下空间及介质内部目标识别与成像等领域.在检测过程中,信号进入待测介质(Material Under Tes...电磁无损检测(Non-Destructive Testing,NDT)是一种非侵入型介质内部信息检测与评估方法,广泛应用于生物医学检测、建筑内部损伤探测与定位、地下空间及介质内部目标识别与成像等领域.在检测过程中,信号进入待测介质(Material Under Test,MUT)内部前会在空气-MUT交界面产生反射,反射信号不仅不携带任何有用信息,还减弱了探测信号的总能量.因此,通过阻抗匹配的方式消除空气-MUT交界面的反射,能够提高信号透射率,进而有效增加NDT回波信号的强度.电磁超表面作为一种新颖的匹配层结构,在NDT信号增强领域得到了广泛应用.本文从阻抗匹配的原理出发,综述其在生物医学检测、水体内外信号传输、室内信息穿墙交互及地下管线增强探测等方面的发展与应用,总结现阶段超表面阻抗匹配层在应用中的需求、面临的困难与挑战,为NDT及信号传输增强领域中阻抗匹配技术的发展提供参考与启发.展开更多
基金supported in part by Shanxi Scholarship Council of China(Grant No.2017-key-2)the Natural Science Foundation of Shanxi Province(Grant No.201801D121145)+1 种基金the Natural Science Foundation of China(NSFC)(Grant No.61731014,61705157,61927811)the Program for Guangdong Introducing Innovative and Entrepreneurial Teams。
文摘NIST(National Institute of Standards and Technology) statistical test recognized as the most authoritative is widely used in verifying the randomness of binary sequences. The Non-overlapping Template Matching Test as the 7 th test of the NIST Test Suit is remarkably time consuming and the slow performance is one of the major hurdles in the testing process. In this paper, we present an efficient bit-parallel matching algorithm and segmented scan-based strategy for execution on Graphics Processing Unit(GPU) using NVIDIA Compute Unified Device Architecture(CUDA). Experimental results show the significant performance improvement of the parallelized Non-overlapping Template Matching Test, the running speed is 483 times faster than the original NIST implementation without attenuating the test result accuracy.
文摘Framework and basic parameters of a test bench for motor drive system of electric vehicle (EV) are illuminated. Two kinds of electric drive models, one was for the electric vehicle drived on real road, the other was for that on test bench, are put forward. Then, dynamic analysis of these models is made in detail. Inertia matching method of the test bench is researched and some useful formulas and graphs are brought forward. The experiment of an electric bus is introduced in order to explain the usage of this inertia matching method.
文摘电磁无损检测(Non-Destructive Testing,NDT)是一种非侵入型介质内部信息检测与评估方法,广泛应用于生物医学检测、建筑内部损伤探测与定位、地下空间及介质内部目标识别与成像等领域.在检测过程中,信号进入待测介质(Material Under Test,MUT)内部前会在空气-MUT交界面产生反射,反射信号不仅不携带任何有用信息,还减弱了探测信号的总能量.因此,通过阻抗匹配的方式消除空气-MUT交界面的反射,能够提高信号透射率,进而有效增加NDT回波信号的强度.电磁超表面作为一种新颖的匹配层结构,在NDT信号增强领域得到了广泛应用.本文从阻抗匹配的原理出发,综述其在生物医学检测、水体内外信号传输、室内信息穿墙交互及地下管线增强探测等方面的发展与应用,总结现阶段超表面阻抗匹配层在应用中的需求、面临的困难与挑战,为NDT及信号传输增强领域中阻抗匹配技术的发展提供参考与启发.
文摘以榆林国家樟子松良种基地樟子松优树子代测定林半同胞家系为研究材料,测定树高、胸径、材积等生长数据,进行方差分析和各性状间的相关性分析,估算遗传力、变异系数、遗传增益、育种值等遗传参数。树高的家系平均值为4.89 m,胸径的家系平均值为10.82 cm,材积的家系平均值为0.0248 m 3,不同家系间的生长表现存在较大的差异。树高、胸径、材积3个生长性状在不同家系均存在极显著差异,3个性状在不同家系间存在丰富的遗传变异。树高、胸径、材积的单株遗传力分别为0.687、0.587、0.571,家系遗传力分别为为0.729、0.697、0.684,树高、胸径、材积的遗传变异系数分别为22.25%、21.89%、35.97%,各性状的遗传力和遗传变异系数均较大。以家系材积育种值为家系选择指标,以70%的入选率选出较为优良的36个家系,在每一个家系内选出单株材积最大者为第二代种子园建园亲本。
