Current Issue : October-December Volume : 2022 Issue Number : 4 Articles : 5 Articles
This work aims to investigate the impact of memory access limitations in microcontrollers and microprocessors on the performance of software that deals with binary data. The research area covers control systems that process data from the IEC 61131-3 standard using a software-implemented virtual machine. Three methods of memory access are considered, namely byte access, memory copying, and direct pointer. Tests of these methods are performed on several CPUs with ARM architecture (with variants), MIPS, RISC-V, Quark, and others, often used as hardware platforms for control devices. The tests cover 1-, 2-, 4-, and 8-byte data sizes, which correspond to the integer types of the IEC 61131-3 standard. By analyzing the results covering both unaligned and aligned data, the goal of this paper is to indicate which of the memory access methods is the most efficient for a particular platform. The research is supplemented with an evaluation of power and memory requirements for a group of STM32 microcontrollers. Therefore, the contribution of this paper rests in indicating the most efficient memory access method for each of more than a dozen CPUs intended for control applications, with consideration of power and memory requirements....
The purpose is to solve the problems of cumbersome calculation, low accuracy, poor timeliness, rigid data acquisition, high cost, large volume, and insufficient signal processing capacity of traditional vision sensor (VS) in Ningxia companies. Firstly, this paper designs an embedded smart VS based on advanced RISC machines (ARM) processor. Secondly, it proposes a cost estimation algorithm for power transmission and transformation project (PTTP) based on particle swarm optimization-least squares support vector regression (PSO–LSSVR). Afterward, a cost estimation model of PTTP based on building information modeling (BIM) is proposed. Thirdly, historical cost data of PTTP of a Ningxia company within five years are selected as data samples to verify the accuracy of the PSO-LSSVR estimation algorithm and BIM model. The results show the following: (I) The measurement error of the designed smart VS is less than 4%, with high accuracy, which is suitable for large-scale measurement in the construction site. (II) The error of the PSO-LSSVR algorithm in engineering cost prediction is less than 20%, and the accuracy is higher than that of traditional support vector machine (SVM) and LSSVR algorithms. The optimization effect is remarkable and can be used for the feasibility analysis of PTTPs. (III) The proposed BIM-based PTTP cost estimation model error in the project cost estimation is controlled within 10%. With high accuracy, it can be applied to the PTTP management of Ningxia company. The purpose is to provide important technical support for the upgradation of traditional VS technology and the realization of visual management and rapid cost estimation of PTTP of Ningxia companies....
The emergence of the online media environment has made the social environment faced by contemporary students more complicated. How to adapt to the rapid development of the network media environment, correctly grasping yourself in the complicated network world, not indulging in the network, is one of the focuses of many families and schools. As a media environment, the network has the advantages of rapid dissemination, large amount of information, strong interactivity, and rapid release. Especially through the integration with traditional media and new mobile media, it has become an important source of people’s access to massive information. It has had a profound impact. For college sports health science, how to guide students to use online sports health resources for independent learning is an important topic in the reform of college sports health education in the new era. How the university sports health science under the Internet environment can help the development goals of the healthy China in the new era becomes the theoretical problem of the in-depth study of sports health care in colleges and universities in China. This paper studies the optimization and implementation of the teaching principles of sports health in the Internet era. It integrates all the teaching principles of sports health since the reform and opening up and then produces questionnaires. The professors of the teaching of health education are the subjects of the survey. They conducted three rounds of questionnaire survey on the integrated teaching principles of 51 sports health education and analyzed the statistics of each round by mathematical statistics and logic analysis. After the logic unit consumption optimization, the microprocessor performance has been greatly improved and the critical path delay performance optimization maximum value has been increased from 4.69 to 8.24....
IoT (Internet of things) technology will be more widely used in the manufacturing industry, which will bring new trends to the development of the manufacturing industry. With the continuous advancement of IoT technology in the power field, the integration of IoT and smart grid has become a new topic. In the process of monitoring and troubleshooting the whole EPSE (Embedded Power System Equipment), it is very important to conduct a comprehensive analysis and routine testing on specific equipment and systems, so that the power system can work stably. In this paper, the knowledge sharing and transfer model of EPSE based on IoT is analyzed, and an intelligent identification method of EPSE state based on the GA-C_HMM (Genetic Algorithm-Coupled Hidden Markov Model) algorithm is proposed. After the GA parameters are optimized, the state model library is constructed by fitting each state data of the equipment to C_HMM, and the state of the equipment is determined by calculating the maximum probability value of the signal to be diagnosed. The experimental results show that when the recognition time is 12 hours, the recognition accuracy rate of the existing recognition method is 69.7%, and that of the recognition method in this paper is 98.3%, which shows that the recognition accuracy rate of the recognition method adopted in this study is higher than that of the existing methods and the recognition ability is stronger....
Some complex digital circuits must host various operating systems in a single electronic platform to make real-time and not-real-time tasks compatible or assign different priorities to current applications. For this purpose, some hardware–software techniques—called virtualization—must be integrated to run the operating systems independently, as isolated in different processors: virtual machines. These are monitored and managed by a software tool named hypervisor, which is in charge of allowing each operating system to take control of the hardware resources. Therefore, the hypervisor determines the effectiveness of the system when reacting to events. To measure, estimate or compare the performance of different ways to configure the virtualization, our research team has designed and implemented a specific testbench: an electronic system, based on a complex System on Chip with a processing system and programmable logic, to configure the hardware–software partition and show merit figures, to evaluate the performance of the different options, a field that has received insufficient attention so far. In this way, the fabric of the Field Programmable Gate Array (FPGA) can be exploited for measurements and instrumentation. The platform has been validated with two hypervisors, Xen and Jailhouse, in a multiprocessor System-on-Chip, by executing real-time operating systems and application programs in different contexts....
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