衡器计量检定中的技术问题及解决策略分析

本文以衡器计量检定中的技术问题及解决策略分析作为研究题目,具体分析中,概述了新时代衡器计量检定的必要性。剖析了衡器计量检定中的力源稳定性问题、检定本身的问题、检定对象划分问题、检定记录问题,并以此为基础,提出了引进与研发衡器具、完善衡器检定检验制度、优化衡器计量工作环境、提高衡器计量检定人员综合素质等对策。     

智能电能表检定装置性能评价方法研究

智能电能表的计量公平性与电力企业、电能表制造商以及计量检定装置的生产商密切相关。目前,计量检定只通过检查误差范围来判断是否合格,无法判断在合格范围内的误差大幅波动的隐性故障。通过将所有计量误差检定记录存贮在电能表内,在检定时以当前检定结果与历次误差检定记录计算关键误差检测点的欧式距离;以欧式距离衡量当前误差波动幅度,分析电能表是否存在隐性计量问题。进一步将检定结果进行统计分析,计算每个计量检定装置的欧式距离均值,以此作为计量检定装置的性能评价指标。采用类区块链技术实现了防篡改,保证了误差检定记录的可信度;通过基于欧式距离的误差波动分析,可发现电能表安装前的隐性故障;通过基于欧式距离均值的计量检定装置性能评价指标,实现了对各供应商的设备性能综合评价。     

基于数据驱动的计量软件设计

随着计算机技术的普及,自动化检定成为计量检定行业的一个新的关注点。目前,计量软件大多基于具体检定任务开发,其可扩展性不强,往往由于计量任务的改变重新编写软件,从而影响了自动化检定的推广。提出了一种基于数据库的向导型的计量检定软件,以满足检定任务的不同需要。     

150mL活塞式液体微小流量计量标准装置的研究

针对现有液体流量计量标准装置测量范围的限制不能适应微流体计量的需求,研究开发了一种用于生物医药领域的150mL活塞式液体微小流量计量标准装置.介绍了该标准装置的结构、检定原理和检定过程;根据检定需求设计了一种基于LabVIEW平台和PLC的检定系统软硬件.利用LabVIEW平台设计上位机的检定程序,用于实现人机交互、检...     

基于ESB和BPM的计量检定集成平台关键技术研究与实现

计量是现代工业发展的基础,计量检定信息系统是实现工业计量规范化、体系化、数字化目标的重要工具;面对大量异构的信息系统和数字设备的软件接口、复杂的计量业务流程、频繁变更的需求,高质量敏捷搭建计量检定系统的难度日益增加;为解决计量检定系统内外软件接口的高质量集成和软件接口的全生命周期管理,进行计量检定业务流程驱动的敏捷开发,采用集成ESB和BPM平台化的软件架构方法,不仅实现了大量异构接口的快速接入和全生命周期管理,也实现了基于计量业务流程的快速低代码开发;经实际应用提升了软件质量和可靠性,提升了软件项目开发速度和效率,满足了大中型企业计量管理的应用需求。     

衡器计量检定的相关问题研究

随着全球经济的不断发展,商贸活动越发频繁,而衡器作为计量器具,其有助于满足商贸交易公平性要求,为此,基于商贸活动逐步开展的背景下,应注重针对衡器计量检定中凸显出的相应问题进行有效处理,同时注重在衡器工具应用过程中规范操作流程,由此来保障衡器计量结果的可行性、科学性,达到最佳的计量状态。本文从衡器计量检定作用分析入手,并详细阐述了衡器计量检定中凸显出的相应问题,旨在推动计量检定工作的有序开展。     

VXI总线仪器的计量检定

ＶＸＩ总线仪器的操作、控制与传统仪器不同。相应对ＶＸＩ总线仪器的计量检定提出新的要求。本文从ＶＸＩ总线仪器操作控制特点出发，结合我国目前计量检定现状提出ＶＸＩ总线仪器计量检定的硬件及软件方案。并给出实例。。     

测绘仪器计量检定自动校准系统设计

测绘仪器计量检定决定了最终的测绘结果质量,由于计量检定工作内容复杂,为满足用户多样化应用需求,设计测绘仪器计量检定自动化校准系统.基于反向传播,分析影响测绘仪器计量精度关键因素,利用非线性手段设计测绘仪器校准算法;确定系统开发基础条件,通过原始记录板块和数据处理中间件组成校准系统标准接口;利用接件、任务分配、录入、查询...     

某型导弹地测设备自动化计量检定系统总体方案设计

本文根据某型导弹地测设备配置较为分散的特点 ,从计量检定的本质含义出发 ,为实现“整体检定”和“现场原位检定”,设计了一个主从分布式自动化计量检定系统。实践证明 ,方案可行 ,收到了预期效果。     

信息技术背景下的衡器计量检定研究

针对衡器计量数据存在误差、检定过程不完善的问题,利用信息技术设计出一种检定框架,通过云计算进行计量数据的传输和存储,并对数据进行安全加密;对检定系统各模块电路利用ATE7053芯片进行集成,提升了数据处理效率;采用ViBe算法计量数据的比对、切割和验算,并显示出检定结果.最后进行实验分析,对不同规格的衡器进行实验测试,最终验证检定结果的准确性.     

Effects of 3D displays: A comparison between shuttered and polarized displays

The current study investigates the effects of 3D displays (shuttered display vs. polarized display). People experienced superior fidelity and brightness when they watched 2D still images on a shuttered display, rather than on a polarized display. Conversely, people experienced greater brightness when they watched 3D still images on a polarized display, rather than on a shuttered display. Second, people were able to read a smaller font or characters on a shuttered display than on a polarized display. Third, people noticed flickering on a shuttered display when they watched 3D images. Fourth, people experienced greater brightness when they watched 3D moving images on a shuttered display, rather than on a shuttered display. The perceived brightness of the screen positively correlated with enjoyment, content satisfaction, and 3DTV satisfaction when the viewers watched a 3D movie. The flickering, on the other hand, has a negative correlation with enjoyment and 3DTV satisfaction.     

Experimental studies on passive dynamic bipedal walking

Passive dynamic walking is a gait developed, partially or in whole, by the energy provided by gravity. The research on passive dynamic bipedal walking helps create an understanding of walking mechanics. Moreover, the experimental passive dynamic research provides a base to compare and validate computer simulation results. An improved kneed bipedal walking mechanism was designed and built to study the passive gait patterns. The first aim of this study is to determine the equivalency of testing a passive dynamic biped walker on a treadmill to testing on a ramp. Based on the small difference between the gait patterns measured on the two test platforms, testing on a treadmill was found equivalent to testing on a ramp. Gait measurements were then conducted on the treadmill to evaluate the effects of the treadmill inclination angle, mass distribution of the biped, and the length of flat feet on the gait pattern. Results show that most of these parameters had significant effects on the step length, step period and hip velocity of the passive walker. Our experimental results are also compared with previous experimental results.     

相关集的数据关联描述及实例讨论

为了讨论数据关联问题,按层次对数据集进行了粒化,引入了每一粒的相关集,产生了与相关集类关联的分层粒化结构,并称之为粒化树。进而以同一数据集上的两棵粒化树为结构支撑,完成了对数据关联的定义,使相关集之间数据的关联得以数值化表示,形成了数据关联的数值描述方法。对此的研究确定了数据关联的等价条件,以此为依托并通过实例探究了数据关联的相关性质,讨论了关联的紧密程度、数据的粒化等同、关联的相互比较等数值化的处理方法。同时为实例的讨论提供了算法编程的基础,表明了数据关联研究的实际意义。     

Approximating and computing behavioural distances in probabilistic transition systems

In an earlier paper we presented a pseudometric on the states of a probabilistic transition system, yielding a quantitative notion of behavioural equivalence. The behavioural pseudometric was defined via the terminal coalgebra of a functor based on a metric on Borel probability measures. In the present paper we give a polynomial-time algorithm, based on linear programming, to calculate the distances between states up to a prescribed degree of accuracy.     

Efficient breadth first search on multi-GPU systems

Simple algorithms for the execution of a Breadth First Search on large graphs lead, running on clusters of GPUs, to a situation of load unbalance among threads and un-coalesced memory accesses, resulting in pretty low performances. To obtain a significant improvement on a single GPU and to scale by using multiple GPUs, we resort to a suitable combination of operations to rearrange data before processing them. We propose a novel technique for mapping threads to data that achieves a perfect load balance by leveraging prefix-sum and binary search operations. To reduce the communication overhead, we perform a pruning operation on the set of edges that needs to be exchanged at each BFS level. The result is an algorithm that exploits at its best the parallelism available on a single GPU and minimizes communication among GPUs. We show that a cluster of GPUs can efficiently perform a distributed BFS on graphs with billions of nodes.     

MATLAB在图象数字水印技术研究中的应用

数字水印技术作为数字媒体版权保护的有效办法,涉及到多个学科,迫切需要一种强大的研究工具.MATLAB以其自身具有的优势,正好可以成为研究数字水印的一种有效工具.本文是在作者编程研究图象数字水印的背景基础上,总结MATLAB在其中的应用.为了证明MATLAB的高效性,作者在本文结尾部分给出一个用MATLAB实现基于Chebyshev混沌信号的扩频图象数字水印实例.     

Load mapping for seamless interface between hydrodynamics and structural analyses

This paper addresses the problem of a seamless interface between hydrodynamics and structural analyses. A pressure distribution on a hydro model computed from seakeeping analysis needs to be transferred to a structural model for evaluating structural strength and its integrity. However, due to the differences in the computation and representation methods for both analyses, the load on the hydro model may not be correctly transferred to the structural model, leading to a different load distribution on the structural model and resulting in some unbalanced force and moment components. In this paper, a method is proposed to solve this problem. A pressure distribution on the hydro model is mapped on the structural model through projection, and force and moment imbalances on the structural model are eliminated through optimization of the nodal forces on the structural model. Moreover, a viscous force distribution along the center of each member of the hydro model is transferred to the nodal forces on the structural model based on the minimum distance measure with resolving any force and moment imbalance. Examples are presented to demonstrate the validity of the proposed method.     

Gait generation and control for biped robots with underactuation degree one

The paper develops a unified feedback control law for n degree-of-freedom biped robots with one degree of underactuation so as to generate periodic orbits on different slopes. The periodic orbits on different slopes are produced from an original periodic orbit, which is either a natural passive limit cycle on a specific slope or a stable periodic walking gait on level ground generated with active control. First, inspired by the controlled symmetries approach, a general result on gait generation on different slopes based on a periodic orbit on a specific slope is obtained. Second, the time-scaling control approach is integrated to reproduce geometrically same periodic orbits for biped robots with one degree of underactuation. The degree of underactuation is compensated by one degree-of-freedom in the temporal evolution that scales the original periodic orbit. Necessary and sufficient conditions are investigated for the existence and stability properties of periodic orbits on different slopes with the proposed control law. Finally, the proposed approach is illustrated by two kinds of underactuated biped robots: one has a passive gait on a specific ground slope and the other does not have a natural passive gait.     

基于切空间判别学习的流形降维算法

在基于图像集的流形降维问题中,许多算法的核心思想都是把一个高维的流形直接降到一个维数相对较低、同时具有的判别信息更加充分的流形上.投影度量学习（projection metric learning,简称PML）是一种Grassmann流形降维算法.该算法是基于投影度量,并且使用RCG（Riemannian conjugate gradient）算法优化目标函数,其在多个数据集上都取得了较好的实验结果,但是对于复杂的人脸数据集,如YTC其实验结果相对较差,只取得了66.69%的正确率.同时,RCG算法的时间效率较差.基于上述原因,提出了基于切空间判别学习的流形降维算法.该算法首先对于PML中的投影矩阵添加扰动,使其成为对称正定（symmetric positive definite,简称SPD）矩阵;然后,使用LEM（log-euclidean metric）将其映射到切空间中;最后,利用基于特征值分解的迭代优化算法构造判别函数,得到变换矩阵.对提算法在多个标准数据集上进行了实验验证,并取得了较好的实验结果,从而验证了该算法的有效性.     

NURBS曲线曲面插补算法基于S12的测试

传统的基于直线和圆弧的插补算法已经不能满足数控技术发展的需要,采用基于自由曲线的插补算法是大势所趋。目前关于NURBS曲线插补的研究大部分还停留在单段的研究上,没有突破传统数控技术的范围。在目前开放式数控技术日益重要的情况下,提出了基于整条曲线或者整个曲面的插补算法,并将该算法应用在S12单片机上进行测试,测试结果显示能够满足要求。