关键词： Wilson电流源   低功耗   高精度   电流比较器   比较器电路  

摘要： 针对传统电流比较器功耗高、精度低等问题,提出了一种基于Wilson电流源的CMOS电流比较器电路.它由Wilson电流源、差分放大器和输出增益级3部分组成.由于Wilson电流源具有较好的恒流特性以及较高的输出阻抗,所以该电流比较器具有较高的比较精度和低延迟的传播特性.采用TSMC 0.18 CMOS工艺HSPICE模型参数对该电流比较器的性能进行了模拟,该电路具有较高的比较精度,当参考输入电流为5 nA时,电路正常工作.当输入差分电流为1μA时延迟为2.2 ns,电路的功耗在TT(typical)工艺角下为95μW.结果表明,该CMOS电流比较器具有较大的速度/功耗比,性能受工艺偏差影响较小,适用于高速、低功耗电流模集成电路.

关键词： 图像采集系统   UDP通讯   多线程   MySQL  

摘要： 在基于深度学习的轮胎外观缺陷检测研究中,需要用大量的轮胎外观图像样本进行训练。本文设计了一种轮胎外观图像采集系统。使用VisualStudio2015开发平台、CSharp编程语言和MySQL数据库进行软件开发,以海康威视DS-2CD3T86FWDV2-I3S型号摄像头和鑫威森LS-L060MD25W型号LED补光灯组成采集装置,通过UDP通讯控制采集装置对轮胎外观图像进行采集,使用多线程获取采集的轮胎外观图像并实时展示,通过MySQL数据库将轮胎基本信息保存到本地,方便实时查询。本设计可拓展应用于需要进行图像以及其他信息采集的相关领域。

关键词： 低功耗蓝牙   防丢器   微信小程序  

摘要： 穿戴设备越来越走近林业活动中,特别是一些随身携带的林业勘探小工具更加受到从业人员的青睐,使用频率越来越高,但同时也存在不同程度的丢失现象。利用低功耗蓝牙技术设计一个拥有防丢找回功能的应用程式。通过调用手机的蓝牙功能来获取绑定在物品上的蓝牙信号的强度来计算两个蓝牙设备之间的距离。当距离超过设定阈值时给出警告信息,从而达到提醒防丢目的。采用多次测量取均值的方法降低蓝牙信号浮动的负面影响,解决了RSSI值不够稳定且容易受到干扰的缺点,提高了测距的稳定性,可以为林业生产用具的管理提供帮助。

关键词： 核心装备   计算机设备   机架式服务器   自主创新   龙芯   一体机   新一代信息技术   核心业务  

摘要： 全国产计算机?同方计算机(浙江)有限公司同方计算机(浙江)有限公司以自主创新计算机设备、通信电子产品的研发测试和生产制造为核心业务,是同方计算机在自主创新领域重要的产业中心之一。超锐系列龙芯笔记本、超翔系列龙芯台式机、超翔系列龙芯一体机以及超强系列龙芯机架式服务器等产品是公司基于龙芯平台开发的全国产计算机产品。

关键词： 低功耗蓝牙   Bluetooth   测向   SOC   电子科技   RF5   Semiconductor  

摘要： Nordic Semiconductor宣布位于唐山的唐山宏佳电子科技有限公司已选择使用Nordic支持蓝牙5.1测向功能的n RF52832低功耗蓝牙(Bluetooth?Low Energy/Bluetooth LE)系统级芯片(SoC)和nRF52811 SoC以助力其HJ-380和HJ-180紧凑型模块。

关键词： 低功耗无线网络   负载   信道   传输链路   均衡调度  

摘要： 为了提高低功耗无线网络体系动态负载均衡调度能力,降低网络的能量开销,提高网络的吞吐性能,提出一种基于最短路由节点部署的低功耗无线网络体系动态负载均衡调度算法。构建低功耗无线网络的节点部署的信息传播模型,采用自适应链路均衡方法进行低功耗无线网络的传输信道均衡设计,结合自适应插值方法进行动态负载均衡调度的优先级列表构建,采用多重节点反复组合方法进行无线网络节点优化部署,设计高效时分多址协议进行的低功耗无线网络体系负载调度的时隙分配,实现动态负载均衡调度。仿真结果表明,采用该方法进行低功耗无线网络体系动态负载调度的负载均衡性较好,网络的输出吞吐量较高,有效改善了低功耗无线网络的信息传输和节点部署性能。

关键词： Yarn stiffness   boucle yarn structure   fancy yarn  

摘要： This study examines the relationships between the structure of fancy boucle yarns and the bending stiffness of the input threads that are used to make those fancy yarns. Four fancy boucle yarns and an extra two confirmation boucle yarns were made to test the impact of the bending stiffness of the effect input threads. Six fancy yarns were made to test the impact of bending stiffness of the core thread on the fancy yarn structure. The structure of the fancy yarn was defined by the number of fancy profiles, the size of fancy profile, the circularity ratio of fancy profile and the shape factor of fancy yarn. It was found that increasing the value of the stiffness of the effect thread increased the size of fancy profile but decreased both the number of fancy profiles and the shape factor of fancy yarn. Those relationships were represented by regression models that were significant at alpha = 0.10. The deviation between the theoretical values and the real values was -14.39% and 2.07%. Further, up to a value of 8.636 g mm(2), the bending stiffness of the core thread appeared not to have an effect on the structure of the fancy yarns. This study is important as it is the first that accounts statistically for the impact of bending stiffness of the input threads on the structure of the resultant fancy yarns. Therefore, it aids fancy yarn manufacturers when designing fancy yarns with predicted structures.

关键词： Fault tolerance   Reliability   Thread replication   Lock-step   Soft errors   Bare-metal  

摘要： This article presents a software protection technique against radiation-induced faults which is based on a multi-threaded strategy. Data triplication and instructions flow duplication or triplication techniques are used to improve system reliability and thus, ensure a correct system operation. To achieve this objective, a relaxed lockstep model to synchronize the execution of both, redundant threads and variables under protection on different processing units is defined. The evaluation was performed by means of simulated fault injection campaigns in a multi-core ARM system. Results show that despite being considered techniques that imply an evident overhead in memory and instructions (Duplication With Comparison and Re-Execution - DWC-R and Triple Modular Redundancy - TMR), spreading the replicas in different instruction flows not only produce similar results than classic techniques, but also improves the computational and recovery time in presence of soft-errors. In addition, this paper highlights the importance of protecting memory-allocated data, since the instruction flow triplication is not enough to improve the overall system reliability.

关键词： Calculations  

摘要： In this paper, three novel metallic sp(2)/sp(3)-hybridized boron nitride (BN) polymorphs are proposed by first-principles calculations. One of them, denoted as tP-BN, is predicted based on the evolutionary particle swarm structural search. tP-BN is composed of two interlocked rings forming a tube-like 3D network. The stability and band structure calculations show that tP-BN is metastable and metallic at zero pressure. Calculations for the density of states and electron orbitals confirm that the metallicity originates from the sp(2)-hybridized B and N atoms, forming 1D linear conductive channels in the 3D network. According to the relationship between the atomic structure and electronic properties, another two 3D metastable metallic sp(2)/sp(3)-hybridized BN structures are constructed manually. Electronic property calculations show that both of these structures have 1D conductive channels along different axes. The polymorphs predicted in this study enrich the structures and provide a different picture of the conductive mechanism of BN compounds.