关键词： 宽温度范围   传感器芯片   数字输出   测量精度   高精度   MCU   低功耗   微电子  

摘要： 纳芯微电子宣布推出高精度双引脚低功耗数字输出型温度传感器芯片NST1001。NST1001具有脉冲计数型数字输出，以及在宽温度范围内高精度的特性，可直接与MCU连接使用，在保障测量精度的同时，降低MCU开销并减少成本。

关键词： 毫米波无线通信   空闲侦听   数据包到达检测   广义似然比   低功耗  

摘要： 针对毫米波无线通信系统,提出了一种基于采样精度切换的低功耗空闲侦听方案,使得CSMA/CA下空闲侦听功耗与接收机解调所需高耗能模数转换器(ADC)功耗互相独立.具体而言,在空闲侦听状态,接收机使能极低功耗的1比特ADC和所提的1比特采样精度广义似然比包检测器来捕获突发包的到达;一旦捕获成功,接收机切换到原高精度ADC来解调数据包,进而保持了解调性能.该文推导并验证了所提方案中包到达检测器的虚警概率(FAP)和漏检概率(MDP)表达式.仿真结果表明,该方案与现有方案相比可显著降低空闲侦听功耗,并获得优异的检测性能.

关键词： 平面电容传感器   介电测量   低功耗  

摘要： 提出了基于平面电容传感器的低功耗介电测量系统的设计方法。系统以MSP430单片机为核心,硬件电路包括电容测量模块、人机交互模块、电源管理模块等。软件包括初始化模块、数据采集模块、中断模块、计算显示模块等;研究了平面电容传感器参数设计方法,并建立介电常数的计算模型。系统应用于复合材料检测,实验结果表明:系统功耗低、重复性好,能有效实现材料损伤检测及介电常数的测量。

关键词： 表情识别   残差网络   Leaky   Integrate   and   Fire(LIF)神经元   卷积神经网络  

摘要： 为了提高表情识别率并降低表情识别的功耗,提出一种基于改进深度残差网络的表情识别方法。残差学习在解决深度卷积神经网络退化问题、使网络层次大幅加深的同时,进一步增加了网络的功耗。为此,引入具有生物真实性的激活函数来代替已有的整流线性单元(Rectified Linear Units,ReLU)函数,并将其作为卷积层激活函数对深度残差网络进行改进。该方法不仅提高了残差网络的精度,而且训练出的网络权重可直接作为与该深度残差网络具有相同结构的深度脉冲神经网络的权重。将该深度脉冲神经网络部署在类脑硬件上时,其能够以较高的识别率和较低的能耗进行表情识别。

关键词： Java   多线程   socket   网络编程  

摘要： 在利用Java进行网站开发或软件系统设计过程中,最经常使用的就是基于TCP的网络编程,而网络编程的典型特征就是一个服务器端同时要应对多个客户端的请求,为了更快地对客户端的请求做出响应,服务器端必须为每个客户端连接单独创建线程,并采取一定的机制对这些线程进行同步控制,操作系统会采用时间片轮转等调度方式对这些线程进行处理.

关键词： FPGA器件   低功耗设计   数字前端   非易失性   蜂窝   可编程器件   接入网络   设计人员  

摘要： 在移动接入网络中,使用小型蜂窝覆盖室内的场景日益增加;随着5G的发展和物联网的到来,这种趋势在未来的一段时间内肯定会持续下去。FPGA通常用于小型蜂窝设计的数字前端（DFE）,设计人员可以从多种低功耗FPGA选项中作出选择,其中非易失性技术构建的可编程器件带有独特属性,能够提供最高水平的能源效率。

关键词： 多传感器   WiFi   智能监护   低功耗  

摘要： 为满足病患的日常生活监护需求,针对国内外监测设备普遍存在的感知参数单一、数据关联性丧失,以及433 MHz、ZigBee等短波通讯方式受传输距离限制,可靠性低、配置繁琐、功耗高等问题。采用IEEE 802.11 WiFi传输协议,直接与互联网相连,网络与数据传输层通过TCP/IP协议将采集数据通过无线WiFi直接同步到数据平台中。内部集成光照强度、温度、湿度、磁场、加速度、震动等多个高精度传感器,通过所测多维度数据组合方式全方位监测病人的身体活动以及周围环境等数据。经实验表明,其数据实时性、事件关联性以及可靠性都得到验证,家属与医生可以通过手机和PC端数据对病人进行全方位实时监护,并在危急时刻及时报警,且最低功耗可达到59μA。

关键词： DRAM   address mapping schemes   energy efficiency  

摘要： The power consumption of server platforms has been increasing as the amount of hardware resources equipped on them is increased. Especially, the capacity of DRAM continues to grow, and it is not rare that DRAM consumes higher power than processors on modern servers. Therefore, a reduction in the DRAM energy consumption is a critical challenge to reduce the system-level energy consumption. Although it is well known that improving row buffer locality (RBL) and bank-level parallelism (BLP) is effective to reduce the DRAM energy consumption, our preliminary evaluation on a real server demonstrates that RBL is generally low across 15 multithreaded benchmarks. In this paper, we investigate the memory access patterns of these benchmarks using a simulator and observe that cache line-grained channel interleaving schemes, which are widely applied to modern servers including multiple memory channels, hurt the RBL each of the benchmarks potentially possesses. In order to address this problem, we focus on a row-grained channel interleaving scheme and compare it with three cache line-grained schemes. Our evaluation shows that it reduces the DRAM energy consumption by 16.7%, 12.3%, and 5.5% on average (up to 34.7%, 28.2%, and 12.0%) compared to the other schemes, respectively.

关键词： Multithreaded programs   Shared memory   PThreads   Structural testing   Coverage criteria   Experimental evaluation  

摘要： Concurrent software testing is a challenging activity due to factors that are not present in sequential programs, such as communication, synchronization, and non-determinism, and that directly affect the testing process. When we consider multithreaded programs, new challenges for the testing activity are imposed. In the context of structural testing, an important problem raised is how to deal with the coverage of shared variables in order to establish the association between def-use of shared variables. This paper presents results related to the structural testing of multithreaded programs, including testing criteria for coverage testing, a supporting tool, called ValiPthread testing tool and results of an experimental study. This study was conducted to evaluate the cost, effectiveness, and strength of the testing criteria. Also, the study evaluates the contribution of these testing criteria to test specific aspects of multithreaded programs. The experimental results show evidence that the testing criteria present lower cost and higher effectiveness when revealing some kinds of defects, such as deadlock and critical region block. Also, compared to sequential testing criteria, the proposed criteria show that it is important to establish specific coverage testing for multithreaded programs.