基于遗传算法支持向量机的虚拟仪器动态补偿

为了克服标准支持向量机参数选取受人为因素影响的不足,从而提高虚拟仪器动态误差补偿的精度,在支持向量机原理的基础上,利用遗传算法的自动寻优功能,以虚拟仪器采集到的数据为输入参数,建立了支持向量机的优化模型,并给出了遗传算法具体优化步骤.通过动态误差补偿实例的计算结果表明,给出的优化模型较标准支持向量机模型的补偿效果更加明显,并且具有良好的可靠性和稳定性.     

检衡车及测速装置在动态汽车衡检定中的应用研究

介绍了车载液压起重尾板式专用检衡车的结构设计(包括车辆底盘、货箱改装和检定专用随车叉车等)、工作原理和操作使用方法,并比较说明同传统液压吊臂式检衡车相比较在开展动态汽车衡检定工作时的优越性,论述了便携式车辆测速装置在动态汽车衡动态称量参数检定中的具体应用.综合应用这两项新技术的专用检衡车设计合理、功能齐全、性能稳定,各项指标均满足JJG 907-2006对开展动态汽车衡计量检定的技术要求.     

半监督极限学习机用于Android手机活动识别的研究

基于对现有Android手机活动识别技术的分析,针对从不完全、不充分的移动传感器数据中推断人体活动的难题,将能根据无标签样本提高识别预测准确性和速度的半监督(SS)学习和体现模式分类回归的有效学习机制的极限学习机(ELM)相结合给出了解决Android手机平台的人体活动识别问题的半监督极限学习机(SS-ELM)方法,并进一步提出了主成分分析(PCA)和半监督极限学习机(SS-ELM)结合的PCA+SS-ELM新方法。实验结果表明,该方法对人体活动的识别正确率能达到95%,优于最近提出的混合专家半监督模型的正确率,从而验证了该新方法是可行性。     

Characteristic features of measuring machines and instruments shown at the “Testexpo-77” exhibition

Conclusions For loading purposes the FRG firms use to the same extent both electrohydraulic and mechanical devices, with the former being utilized for very large loads and multicomponent loading. The firms' test-machine gripping devices are provided with hydraulic and electrohydraulic drives. Their test-machine force-measuring devices are provided, in addition to dynamometers with strain-gauge transducers and electronic measurement-processing equipment, also with pendulum instruments. The firms are unitizing on a wide scale their test-machine assemblies and installations such as frames, loading and gripping devices, dynamometers, etc. Electronic computing and controlling machines are widely used for controlling testing, processing test results, and obtaining test reports.Translated from Izmeritel'naya Tekhnika, No. 4, pp. 84–88, April, 1978.     

Dielectric and magnetic measurements: A survey of nondestructive,quasi-nondestructive,and process-control techniques

A review of the most common methods for nondestructive permittivity and permeability measurements is presented. Transmission-line techniques, coaxial apertures, open resonators, surface-waves, and dielectric resonator methods are examined. Measurements on bulk, thin materials, and thin films are addressed. Measurement fixtures that can be used as sensors are highlighted. The frequency range of applicability and typical uncertainties associated with each method are addressed. U.S. Government work not protected by U.S. copyright.     

测量仪器分类论

本文是对测量仪器“器”和“具”之分的发展，提出把测量仪器分为提供量值和测量量值两类。提供量值的仪器复现或输出一定的对应标称值信号；测量量值的仪器则是把输入信号指示出来。作者试图对不同专业的仪器从本质上进行分类，并由此得出测量仪器校准的4种方法，同时提出以偏差表征提供量值仪器，以示值误差表征提供量值仪器。