关键词： 电控挂锁   柔性开闭锁   模块化   低功耗  

摘要： 以CREO2.0为工具开发出一款电控挂锁,通过柔性开闭锁机构,实现低功耗的延时闭锁功能,其核心机械、电子零件实现模块化。文章阐述了其设计及实现方法。

关键词： 集成电路产业   市场化条件   市场换技术   生态体系   弯道超车   信息产业链   龙芯   传送带  

摘要： 中国发展集成电路产业成功的标志,是打造出世界上第三套生态体系,我国计算机发展现在是第三阶段,目标是在市场化条件下实现自主性,现在还是有不少地方依赖“市场换技术”的模式,多款CPU、整机产线一拥而上,以此作为实现“高质量发展”的新机会。买一条传送带只要几万元,再买一些螺丝刀和桌子,一条整机组装线就建好了,但整机组装是整个信息产业链中最不值钱的部分发展核心技术不要幻想“弯道超车”,像芯片这样的高复杂系统能力建设需要以30年为周期,不能经常“翻烧饼”,别人封锁时我们自己研制,别人放开了我们又放弃自主。龙芯已经干了20年了,相信再有10年,我们能初步建成第三套体系。

关键词： FAIMS   高场非对称射频电源   脉冲变压器   半桥逆变   补偿电压  

摘要： FAIMS系统中最基础的部分为高场非对称射频电源,它提供电压差让离子在迁移区中实现有效的分离。通过半桥逆变的原理产生RF方波,设计一种三桥臂的方波产生电路,减小了通过高压直流电源的电流,从而有效减小了系统的功率。考虑FAIMS芯片的复杂性和仪器的便携性,改进差分式射频工作模式,有效降低了FAIMS对高压直流电源的输入要求,有利于高压直流电源的简化和功耗的降低,进而有利于FAIMS的小型化应用。结合补偿电压自动扫描,研制出优化后的高场非对称方波射频电源,通过实验对比,满足FAIMS迁移区的工作要求。

关键词： 信标   全球定位系统   低功耗   浮出海面检测   深海适用  

摘要： 可靠的回收系统是海洋仪器进行有效观测和获取数据的关键一环,其中仪器在海面上与科考船之间的通信信标是回收系统中的重要组成部分。该文设计的低功耗海上仪器回收通信信标是一套可用于海洋仪器回收的轻量化信标机——集成了全球定位系统(GPS)定位模块和Lora低功耗远距离通信模块,浮出海面后可自动切换为待机模式。该系统在低功耗待机模式下理论待机时间长达5年,正常工作模式下可连续工作不少于48 h。仪器上浮后可以将位置信息发送至客户端,有效通信距离达到7 km,并满足9 000 m水深的深海适用要求。功耗测试与通信测试表明,该设备具有功耗低、定位精度高、可靠性高、通信距离较远的优点。

关键词： 星间激光通信   小型化   低功耗  

摘要： 针对当前微小卫星组网场景下的星间链路需求,提出了一种以小型化、低功耗为特色的低速率星间激光通信系统设计方案,介绍了空间激光通信领域的国内外发展现状,重点介绍了系统的设计思想,系统组成及各部分的核心设计要点及关键元件的选型,并对链路可行性进行了分析。

关键词： 无线传感器网络   低功耗设计   目标探测   网状拓扑  

摘要： 基于无线传感器网络的目标探测系统利用磁场、振动、声音等环境参数的变化实现对移动目标的探测。针对无线传感器网络的能量受限问题,从传感器节点硬件选型、节点休眠设计、网络拓扑结构设计和数据传输协议设计等方面出发,进行系统低功耗设计优化。实验结果表明,该探测系统在传感器节点采用容量4 A·h锂电池,采样率10 Hz情况下,平均工作电流仅为3.78 mA,连续工作时长可达33天。

关键词： 多线程   人类大脑   单线程   供应链安全   灵隐寺   冲击波   兴奋区  

摘要： 回声2021年第13期财新网友:虽迟,但总算是来了。《办好证券集体诉讼第一案》灵隐寺钟声:这两年的疫争斗和本次堵船,都在提醒注意供应链安全。《“世纪堵船”冲击波》财新网友:多线程的效率有时候确实不如单线程,大脑的兴奋区有限,所以本质来说人类大脑都是“一个大核+很多小核”的构成.

关键词： Unstructured grid   Volume rendering   Multi-threaded parallel   Projection tetrahedral  

摘要： Volume rendering methods have been extensively studied in recent years due to their effectiveness and expressiveness for unstructured grid data visualization. Although existing volume rendering methods have demonstrated great success, we observe that these methods have extensive interpolation and integral operations, which may adversely affect their efficiency and further prevent them being applied in interactive visualization. To boost efficiency and achieve interactive rendering rates, we propose a novel multi-threaded parallel projection tetrahedral algorithm based on multi-core architecture. By analyzing the parallelism of volume rendering methods, we find that the visibility sorting and classification/decomposition of projection polygons are the most time-consuming parts. To reduce the execution time of these two parts, we design corresponding parallel methods. In this manner, our method can dramatically improve efficiency and further enable user interactions for progressive unstructured grid analysis. The visibility sorting part includes partial sorting and global sorting: In partial sorting, we partition disordered tetrahedral depth array and obtain several loosely coupled subarrays, and in global sorting, we sort each subarray with multi-threads technique. In the classification/decomposition of projection polygons part, we normalize tetrahedral projection to ensure arbitrary tetrahedral produces the same number of triangles, and then store the produced vertex data into vertex array with offset computation that ensures correct order for the multi-threads runtime. The experimental results show that the proposed multi-threaded projection tetrahedral algorithm can achieve a speedup of 3.4X on a 20 cores CPU and outperforms the fastest VTK implementation at a speedup of 2.5X, which verifies the efficiency of our algorithm. Graphic

关键词： Monte Carlo algorithm   Irreversible Markov chain   Multithreading   Event-chain algorithm   Sequential consistency model   C plus   Python   Fortran90  

摘要： We present a multithreaded event-chain Monte Carlo algorithm (ECMC) for hard spheres. Threads synchronize at infrequent breakpoints and otherwise scan for local horizon violations. Using a mapping onto absorbing Markov chains, we rigorously prove the correctness of a sequential-consistency implementation for small test suites. On x86 and ARM processors, a C++ (OpenMP) implementation that uses compare-and-swap primitives for data access achieves considerable speed-up with respect to single-threaded code. The generalized birthday problem suggests that for the number of threads scaling as the square root of the number of spheres, the horizon-violation probability remains small for a fixed simulation time. We provide C++ and Python open-source code that reproduces all our results. Program summary Program title: ParaSpheres. CPC Library link to program files: https://***/10.17632/c3rjk5k3z9.1 Developer's repository link: https://***/jellyfysh/ParaSpheres Licensing provisions: GNU GPLv3. Programming languages: Python 3, C++, Fortran90. Nature of problem: Multithreaded event-chain Monte Carlo for hard spheres. Solution method: Event-driven irreversible Markov-chain Monte Carlo algorithm using local times. Additional comments: The collection of programs is complete with shell scripts that allow one to reproduce all data, and all the figures of the paper. Change of density and system size is straightforward. The manuscript is accompanied by a frozen copy of the GitHub repository that is made publicly available on GitHub (repository tps://***/jellyfysh/ParaSpheres, commit hash e2aa5b9727fb080ebe65581586cof6133efa495d). (C) 2020 Elsevier B.V. All rights reserved.

关键词： Health care   Security   WBAN   Cluster-head   Group key   Multithreaded  

摘要： Purpose Security of wireless body area network communication is highly important as it directly impacts human life. This paper aims to focus on battlefield application area of WBAN for implementing security where data must be protected against various possible attacks before delivering over a public network. Design/methodology/approach Providing a strong security system is still a research challenge due to low computational power of used sensors for protecting transmission data. In this paper, the authors have proposed an optimized security solution for multithreaded wireless body area network (MWBAN) using trust-based distributed group key management technique to overcome the drawbacks of existing elliptical curve cryptography-homomorphism (ECC-Homomorphism) scheme as well as coded cooperative data exchange group key management (CCDE_GKM) scheme. Findings The proposed optimized security solution is implemented for a particular deployment strategy and test runs are conducted. It is found that when number of attack nodes increased to 25, compared to ECC-Homomorphism and CCDE_GKM for the proposed trust-based distributed group key management technique there is an improvement in performance parameters such as throughput is dropped to only 10.11 Kbps, average delay is just 3.4 s, energy consumption is maximum 29 joules, packet loss is only 12.3 per cent, 90.9 per cent truly can detect attack, only 8.9 per cent false attack detection and 84 per cent true negative detection. Social implications Medical care can be provided to human beings with much ease and flexibility via remote monitoring. The user can be at any place, can do his/her everyday work while remotely being monitored of their health parameters and secured transmission of their data to the health-care center for medical service in need. Originality/value This paper presents an optimized security solution for MWBAN using trust-based distributed group key management technique where bilinear pairing theory is used