基于RT-Thread的液压支架监控分站的设计

为提高煤矿生产的安全性和效率,降低生产成本,设计了基于嵌入式实时操作系统RT-Thread的液压支架监控分站。该分站通过CAN总线将综采工作面液压支架的工作数据上传到主站并接收主站下达的指令;此外,通过支架控制器可以实现对液压支架的远程控制。软件设计利用信号量和事件集进行线程间通信同步;同时采用多线程优先级抢占调度机制,实现任务的并发运行。实验证明,该分站具有精度高、可靠性强和实时响应等特点,达到工程实际应用需求。

Security Threads and IoT Security

One of the technologies that have attracted the most attention recently across a variety of applications is the Internet of Things (IoT). The Internet of Things (IoT) is the combination of sensor, embedded computing, and communication technologies. The goal of the Internet of Things is to provide seamless services to anything, everywhere, at any time. The internet of things (IoT) technologies plays a vital role everywhere after the internet and information and communication technology, ushering in the fourth disruptive technology revolution (ICT). For real-time processing, communication, and monitoring, the smart items are linked together through wired or wireless connections. Implementing the IoT system presents security and privacy challenges since IoT devices are incompatible with current security standards based on tradition. This paper discusses IoT security strands, mitigation strategies, and privacy issues. This study’s major objective is to get more knowledge about security threats, mitigation techniques, and privacy concerns in IoT devices. The authors also mentioned a few cutting-edge technologies that can address general security problems. This study’s major objectives are to find research gaps in IoT security and match solution paradigms. The advent and rapid growth of the Internet of Things (IoT), which offers innumerable benefits, facilities, and applications including smart grids, smart homes, smart cities, and intelligent transportation systems (ITS), have an impact on everyone’s life. However, the deployment and use of sensing devices exposes IoT-based systems and applications to many security flaws and attacks. Furthermore, the lack of standardization brought on by the diversity of devices and technologies makes integrating security in the IoT a severe problem. The purpose of this review paper is to highlight the numerous security threats, challenges, and attacks that IoT-enabled applications face.

Using multi-threads to hide deduplication I/O latency with low synchronization overhead

Data deduplication,as a compression method,has been widely used in most backup systems to improve bandwidth and space efficiency.As data exploded to be backed up,two main challenges in data deduplication are the CPU-intensive chunking and hashing works and the I/O intensive disk-index access latency.However,CPU-intensive works have been vastly parallelized and speeded up by multi-core and many-core processors;the I/O latency is likely becoming the bottleneck in data deduplication.To alleviate the challenge of I/O latency in multi-core systems,multi-threaded deduplication (Multi-Dedup) architecture was proposed.The main idea of Multi-Dedup was using parallel deduplication threads to hide the I/O latency.A prefix based concurrent index was designed to maintain the internal consistency of the deduplication index with low synchronization overhead.On the other hand,a collisionless cache array was also designed to preserve locality and similarity within the parallel threads.In various real-world datasets experiments,Multi-Dedup achieves 3-5 times performance improvements incorporating with locality-based ChunkStash and local-similarity based SiLo methods.In addition,Multi-Dedup has dramatically decreased the synchronization overhead and achieves 1.5-2 times performance improvements comparing to traditional lock-based synchronization methods.

Roller Screw and Threaded Chain Speed Reducer: An Experimental Evaluation

We are developing a speed reducer that can be considered a transformation of a worm gear reducer: the worm is replaced by an inverted roller screw, and the gear is replaced by a threaded chain drive. This configuration lessens wear, increases load capacity, and improves efficiency. The threaded chain consists of nut-shaped links. This paper presents the results of tests carried out on a prototype with a reduction ratio of 46.

基于RT-Thread的可信软件栈的设计和实现

针对基于Linux和TCG软件栈(Trusted computing group Software Stack,TSS)的复杂性问题,提出一种轻量级的可信软件栈。分析了TSS的基本结构与TSS在嵌入式系统的局限,总结出基于嵌入式系统的可信软件栈设计需求,设计出软件栈命令调用的机制和软件栈的结构。此外,分析了TSS密钥管理缓存算法,在flash中定义一块密钥槽空间,方便密钥管理中直接访问,阐述密钥生成的逻辑过程,实现面向嵌入式系统的可信软件系统。经实验验证,该软件栈可以结合RT-Thread实时系统实现基本的可信计算功能。

基于RT-thread的精确时间同步系统设计

分布式智能采集终端需要一致的时间基准,用于多种数据和事件的时间标记。为满足智能采集终端对高精度时间同步的需求,选择IEEE 1588精确时间同步协议实现时间同步;设计基于纯国产32 bit双核微控制器HPM6750和以太网收发器RTL8211FS(I)-VS的精确时间同步系统,选用国产开源嵌入式实时操作系统RT-thread操作系统,实现在物理层获取时间戳来运行IEEE 1588协议;构建测试平台对该时间同步系统进行主从时钟同步精度测试。测试结果表明,设计在物理层获取时间戳时达到的时间同步精度在±250 ns以内,与在数据链路层获取时间戳时达到±10μs的时间同步精度相比较,有效提高了时间同步精度,可广泛应用于对时间同步精度有较高要求的智能采集终端。

基于RT-Thread的温湿度数据采集监测系统设计

温湿度数据的采集和监测在各行各业中发挥着重要作用。本文基于RT-Thread设计了一个分布式温湿度采集监测系统。该系统以STM32开发板为主控模块,在芯片中嵌入RT-Thread实时操作系统,可实时采集分布式节点的温湿度数据,并通过无线网络将数据上传至OneNET云平台。该系统提高了数据采集的实时性,实现了温湿度数据的可视化显示和远程实时监测功能。

MiniGUI-Threads与MiniGUI-Lite下多串口通信的设计与实现

MiniGUI是目前较成熟的嵌入式Linux系统的图形用户界面,具有小巧、可配置和可移植等特点。MiniGUI可以编译成两个截然不同的运行模式:MiniGUI-Threads模式适用于实时性高,功能相对简单的系统,比如工控仪器等;而MiniGUI-Lite模式多用于功能丰富,结构复杂的系统,如PDA等信息产品。文章介绍了如何在这两个运行模式下设计并实现多个串口的实时双工通信,最后还指出了两种模式下实现串口监听程序和同步问题方面的差别。

基于RT-Thread的二维码导航移动机器人设计

针对现有基于速度模式二维码导航纠偏算法存在的计算量大、控制逻辑复杂、控制精度不高等问题,提出了基于位置模式的二维码导航纠偏算法,基于嵌入式实时操作系统RT-Thread设计了自主导航移动机器人。经实验验证,本算法简洁、高效、计算量小,可以实现移动机器人的精确、高效、稳定、可靠导航。

An Experimental Study on Using Laser for Cleaning Metal Threads

Samples of metal threads were prepared, underwent artificial aging, and cleaned using laser applications to define the efficiency of cleaning that gives the best results without affecting the components of the thread, including metal, fibers, or dyes. The present study aimed to investigate and evaluate laser cleaning of the corroded metal embroidery, revealing the chemical composition of the corrosion and prop and evaluating the effects of laser cleaning on the surface of the metal threads. It utilized SEM and LM to provide morphological information about the surface and the cleaning effect. Moreover, SEM-EDX was used to define the elemental composition, and XRD was employed to offer information on the metal. The restoration of cultural heritage depends on defining the devastating changes to the man-made pieces. It compares pre-and post-restoration conditions of the object (e.g. painting, photography, and material analysis), controlling the conditions that are almost irrevocable. An Interval Digital Macro-photography is employed to control the corrosion PS tests for a long period of museum exhibition [1].

Is the immediate use of guided bone regeneration on exposed dental implant threads beneficial?

Thin buccal bone has a risk of thread exposure, and placement of a graft is the mainline of treatment for thread exposure. However, this process takes time as the patient is expected to wait for healing to occur before the implant can be placed. To overcome the waiting period, this study views a different method. This study examines the use of guided bone regeneration on the day of implant placement on buccal bone where thread exposure occurs. This process has the advantage of avoiding the patient to go through multiple operations till receiving the final prosthetic treatment, also saving time and money for both the patient and the practitioner.

基于BL602的RT Thread移植方法研究

RT Thread是一款嵌入式实时操作系统,因其易于移植、可裁剪性好等特点备受广大嵌入式开发者的喜爱。BL602芯片内含一个32位的RISC V架构的微处理器,兼具高性能、超低功耗等特点。但目前关于将RT Thread实时操作系统移植到BL602芯片上还没有成熟的方案,针对这一现象,给出了将RT Thread移植到BL602上的详细方案。通过剪裁源码、修改配置文件、修改系统时钟、添加串口输出、采用轮询或中断回调实现串口输入等操作进行移植。实验结果表明,移植到BL602上的RT Thread操作系统可以正常运行,并且具备任务管理、任务调度等功能。本文提出的移植方案不仅可以降低BL602的开发难度、提高CPU的利用率,而且为其他RTOS移植提供了参考。

基于RT-Thread的Zynq-7000实时控制系统设计与实现

针对目前相控阵天线控制系统通讯高速、高实时、高稳定的需求,设计了一款基于Zynq-7000和RT-Thread操作系统的实时控制系统。首先从硬件方面讨论了系统的总体结构,在软件方面采用优先级抢占式的任务调度方式以及消息队列、信号量和邮箱等任务通信机制来确保实时性和可靠性;其次移植RT-Thread实时操作系统到Zynq-7000平台中,利用LwIP协议栈完成网络通信功能设计;最后构建了实验测试平台。测试结果表明:提出的基于Zynq-7000和RT-Thread的实时控制系统在网络传输方面具有低时延、低抖动和低丢包率的优点,保证了系统执行处理的实时性和稳定性。

Expressions of the radius and the surface tension of surface of tension in terms of the pressure distribution for nanoscale liquid threads

The expressions of the radius and the surface tension of surface of tension Rs and γs in terms of the pressure distribution for nanoscale liquid threads are of great importance for molecular dynamics （MD） simulations of the interfacial phenomena of nanoscale fluids; these two basic expressions are derived in this paper. Although these expressions were derived first in the literature[Kim B G, Lee J S, Han M H, and Park S, 2006 Nanoscale and Microscale Thermophysical Engineering, 10, 283] and used widely thereafter, the derivation is wrong both in logical structure and physical thought. In view of the importance of these basic expressions, the logic and physical mistakes appearing in that derivation are pointed out.

Multi-threaded Fast Distance Field Computation Using Spatial Partition

This article describes three algorithms for distance field generation on triangulated model: brute force algorithm, single-threaded algorithm based on spatial partition and multi-threaded algorithm based on spatial partition. Spatial partition algorithm use equidistant network divide the bounding box into equal-sized cubes, calculates the maximum and minimum distances between the sample point and each of the small cubes,taking the minimum value from the maximum distance as the minimum distance from the sample point to the model named d1, comparing d1 with the distance from sample point to every little cube's minimum distance d2, if d1 <d2, the sample point's distance to all triangles inside this cube are greater than d1, skip this cube, otherwise, calculated the distance from the point to all the triangles intersect with the cube, then alternative d1 with the minimum value, circulate all small cubes intersect with the model. Comparing the calculation results, it can be seen that the algorithm about the multi-threaded distance field relative to the other two algorithms in computational speed is greatly improved especially for complex models.

An HLA/RTI Architecture Based on Multi-thread Processing

In order to improve the real-time performance of the real-time HLA(high level architecture) in the application of massive data communication volume,multi-thread processing was adopted,thread pool structure was introduced into the system,different threads to handle corresponding message queues was utilized to respond different message requests.Furthermore,an allocation strategy of semi-complete deprivation of priority was adopted,which reduces thread switching cost and processing burden in the system,provided that the message requests with high priority can be responded in time,thus improves the system's overall performance.The design and experiment results indicate that the method proposed in this paper can improve the real-time performance of HLA in distributed system applications greatly.

Formal Modeling and Analysis of AADL Threads in Real Time Maude

This paper presents, without altering the AADL meta-model, a formal description of static and behavioral aspects of the AADL thread component. This active and concurrent applicative component of AADL poses many challenges to its formalization and analysis including instantaneous and/or delayed communications, concurrent tasks and time-dependent features, and the need to analyze correctness. This formalization, based on real-time object-oriented theories, allows not only a precise description of the semantics of threads composition with respect to their timing requirements but also makes possible the formal verification of behavioral properties.

Efficient computation of Hash Hirschberg protein alignment utilizing hyper threading multi-core sharing technology

Due to current technology enhancement,molecular databases have exponentially grown requesting faster efficient methods that can handle these amounts of huge data.There-fore,Multi-processing CPUs technology can be used including physical and logical processors(Hyper Threading)to significantly increase the performance of computations.Accordingly,sequence comparison and pairwise alignment were both found contributing significantly in calculating the resemblance between sequences for constructing optimal alignments.This research used the Hash Table-NGram-Hirschberg(HT-NGH)algo-rithm to represent this pairwise alignment utilizing hashing capabilities.The authors propose using parallel shared memory architecture via Hyper Threading to improve the performance of molecular dataset protein pairwise alignment.The proposed parallel hyper threading method targeted the transformation of the HT-NGH on the datasets decomposition for sequence level efficient utilization within the processing units,that is,reducing idle processing unit situations.The authors combined hyper threading within the multicore architecture processing on shared memory utilization remarking perfor-mance of 24.8%average speed up to 34.4%as the highest boosting rate.The benefit of this work improvement is shown preserving acceptable accuracy,that is,reaching 2.08,2.88,and 3.87 boost-up as well as the efficiency of 1.04,0.96,and 0.97,using 2,3,and 4 cores,respectively,as attractive remarkable results.

Summary and clinical application of Zhuang medicine medicated thread moxibustion

Zhuang medicine medicated thread moxibustion is a kind of external therapy with ethnic medicine characteristics that spreads in Guangxi Zhuang region.It has a wide range of clinical application and significant curative effect,and can be used to treat diseases such as internal medicine,surgery,dermatology,gynecology,pediatrics,and five sense organs.Through reviewing and combing the literature on the Zhuang medicine medicated thread moxibustion in recent years,this paper summarizes and prospects its clinical application,with a view to further explaining the basic principles and application rules of Zhuang medicine medicated thread moxibustion and digging its clinical value.

基于RT-thread的小麦病虫害检测系统的研究与应用

【目的】为解决小麦病虫害问题,设计出一款基于RT-thread物联网操作系统的小麦病虫害检测系统。【方法】该检测系统以STM32H750XBH6单片机为核心主控板,使用神经网络对小麦病虫害进行识别。同时,该检测系统采用OneNET物联网云平台来实现数据的上行,并使用OneNET view组件实现对数据的二维显示。【结果】系统稳定运行后,能在多种恶劣环境中识别出不同的小麦病虫害问题,并通过调用数据库来给出该健康状况下的解决方案。【结论】该系统不仅能降低因小麦病虫害带来的损失,还能减少人力物力的投入。