关键词： 低功耗物理设计   早期时钟树   新功耗优化流程   混合摆放  

摘要： 随着深亚微米工艺的发展,集成电路的复杂程度不断提高,单位面积的晶体管数目在不断增加,同时对于芯片高工作频率和多信息处理的需求也逐渐增强,所以芯片的功耗问题正日益变成超大规模电路设计的瓶颈。本文使用Cadence公司推出的新一代布局布线工具Innovus,结合ARM公司28 nm CMOS工艺库,针对GPU特定的功耗组成,完成了新的低功耗物理设计流程。该低功耗设计内容包括新功耗优化流程、早期时钟树和混合摆放等方法。利用这一新颖的低功耗物理设计流程,在保证时序收敛的基础上,功耗可以进一步降低约11%,同时也为后续压缩模块面积提供了空间。

关键词： Java多线程   访问资源   线程安全   同步机制   健壮性  

摘要： 为了避免Java应用程序中多个线程共享同一个资源时产生访问冲突,确保线程安全,采用同步机制为每个线程合理地分配访问资源。编写一个模拟火车站售票过程的Java应用程序,由4个线程完成100张火车票的出售,调用sleep方法查看非同步环境下每个线程访问资源的状况。分析多线程采用同步机制和非同步机制的实验给系统带来的影响。实验证明,借助同步机制能合理地为每个线程提供没有任何冲突的资源访问,使Java多线程程序获得更好的健壮性。

关键词： 互补金属氧化物半导体集成电路   低功耗   衬底注入   交叉耦合   正交压控振荡器  

摘要： 提出了一种基于衬底注入技术的正交压控振荡器(QVCO)。此QVCO的实现是基于两个电感电容压控振荡器的耦合作用,并没有任何额外的耦合器件。在相位噪声、正交相位误差、调谐范围以及功耗方面,对所提出的QVCO与传统的QVCO进行了比较。仿真表明:该QVCO在4.1 GHz处取得了0.62°的正交相位误差,采用标准的0.13μm互补金属氧化物半导体(CMOS)工艺对该QVCO进行流片实现,芯片面积为0.51 mm×0.87 mm。测试结果表明:在3.95 GHz处的相位误差为-118.5 d Bc/Hz@1MHz,在0.5 V电源电压供电下,消耗的功耗为0.41 m W,适用于低功耗需求场合。

关键词： DS18B20   OLED   WIFI   体温计  

摘要： 体温是反映人体生理状况的一项重要指标,体温测量也是护理工作中一项重要的护理技术,为了方便测量被测者的体温,设计一种基于DS18B20传感器的温度采集器,硬件系统由低功耗的微处理器STM32F103C8T6、OLED液晶显示屏和WIFI模块构成,实现了通过移动终端随时查看被测者体温的功能.通过系统原理图和搭建的样机测试电路研究表明,该系统具有操作简单、易便携、运行稳定、成本低的优点,可更加高效、准确地监测人体的体温.

关键词： Digital image correlation   Real-time measurement   Multi-thread parallelization   Path-dependent   Thread competition  

摘要： With the increasing demands on the real-time measurement using digital image correlation (DIC), the fast and ultra-fast computation are attracting much more attention from academic and engineering fields in last decades. Multi-thread parallelization is a recognized effective method to raise the correlation speed of traditional single thread DIC up to higher order of magnitude. However, for the path-dependent parallel DIC based on specific initial guess propagation method, competition between different threads greatly cuts down the overall speed, because different threads visit the same queue or status matrix at the same time. Therefore, the desired linear speed-up ratio growth could hardly be achieved especially for large thread number. In this work, three novel strategies are proposed to minimize the thread competition for the existing path-dependent parallel DIC, including i) allocating private queues for private thread, ii) restarting idle thread if others are busy, and iii) collecting more uncorrelated neighboring points for subsequent correlation. In this way, the conflict between threads is obviously decreased and experiment results reveal that the proposed method could upgrade the 2D-DIC speed up to 145,000 points per second using 48 threads, which makes the real-time measurement feasible for region of interest (ROI) with less than 5000 points.

关键词： Electrical Engineering   Biomedical Engineering   Low power, implant, wireless, biomedical, conductance, animal model, bladder, neuromodulation, catheter, device, sensor  

摘要： New research tools are essential to understanding neural control of the lower urinary tract (LUT) and could enable new treatments or neuroprosthesis to eliminate incontinence. Modern technologies enable real-time, catheter-free monitoring of bladder pressure, however variations in physiology among animals and people complicate interpretation of pressure data without bladder volume information. To date, no available technology achieves catheter-free, chronic monitoring of bladder volume. This thesis describes the design of a fully-wireless device for conductivity-corrected conductance measurements of fluid volume in a catheter-free system. The device consists of two electrodes, one sensing anode, and a microcontroller, and is small enough for surgical implantation within the bladder lumen. In-vitro benchtop testing demonstrated fluid volume prediction with <5mL mean error below 40mL and a worst-case mean error of 13mL near full-scale volume. These results indicate that conductance-based volume sensing of the urinary bladder is a feasible method for real-time catheter-free urine volume measurement.

关键词： 船舶   电力系统   低功耗电子电路   故障获取   数据挖掘  

摘要： 低功耗电子电路是船舶电力系统的主要组成部分,也是最易出现故障的部分,针对当前船舶电力系统低功耗电子电路故障获取方法存在的不足,为了提高船舶电力系统低功耗电子电路故障获取精度,设计了基于数据挖掘的船舶电力系统低功耗电子电路故障获取方法。首先分析当前船舶电力系统低功耗电子电路故障获取研究存在的问题,指出当前获取方法存在的局限性,然后提取船舶电力系统低功耗电子电路故障特征,采用数据挖掘技术构建船舶电力系统低功耗电子电路故障获取模型,最后进行了船舶电力系统低功耗电子电路故障获取仿真实验,实验结果表明,本文方法的船舶电力系统低功耗电子电路故障获取平均精度超过95%,远远高于对比方法的船舶电力系统低功耗电子电路故障获取精度,降低了船舶电力系统低功耗电子电路故障获取错误。

关键词： LoRa   物联网   低功耗   远距离   LoRaWAN  

摘要： 以LoRa为代表的低功耗、远距离网络技术的出现,有效解决了物联网复杂组网和超高功耗的难题。为进一步降低基于LoRaWAN的无线抄表系统的功耗,同时针对ZigBee、红外等无线技术在抄表方案中存在通信距离短、抗干扰能力弱的缺陷,通过对LoRaWAN无线标准协议的研究,将MCU系统和LoRa技术相结合,设计了一种基于LoRaWAN无线通讯技术的智能抄表系统。首先介绍无线抄表系统的硬件组成和功能模块的作用,其次介绍节点软件设计过程,最后得出结论,该系统实现了降低功耗的作用。