Key Technology of Embedded System Implementation for Software-based CNC System

The software-based computer numerical control（CNC） system includes three types of tasks： periodic real-time tasks, aperiodic real-time tasks, and non-real-time tasks. The tasks are characterized by concurrency, hybridization, and correlation, which make system implementation difficult. The conventional scheduling algorithm can not meet the demands of system implementation in the software-based CNC system completely. The uncertainty factors when running real-time tasks affect control performance by degrading manufacturing accuracy as a result of system resource and processor use restrictions. To address the technical difficulty of embedded system implementation, a novel fuzzy feedback scheduling algorithm based on output jitter of key real-time tasks for a software-based CNC system is proposed. Time characteristics, such as sampling jitter, input-output jitter, and non-schedulability are discussed, followed by quantification through simulations of the impact of time characteristics on manufacturing accuracy. On the basis of this research, the scheduler architecture is designed, and then the algorithm table is calculated. When the system resource changes, the key periodic real-time tasks meet their deadlines by means of dynamically adjusting the task period. The simulated results show that the machining precision rises by an order of magnitude for the proposed scheduler in resource-constrained software-based CNC systems. Moreover, unlike conventional feedback scheduling methods, the algorithm in this paper does not rely on the availability of task execution times and is easy to implement while incurring only a small overhead.

System Implementation Failures in the ERP Development Process

ERP mainly relates to business management software which consists of several modules that are important for the growth and survival of different types of businesses and organisations. The integration of related business applications in an organisation can bring significant advantages to the business by enabling faster supply chain management. ERP implementation enables firms to adapt and configure information flows and integrate business processes in order to enhance business performance. System implementation has been reviewed with adequate literature to significantly support the importance of arithmetic and logical concepts and basic errors in programming including typographical errors in a programme, identification of syntax errors and programme output process errors. It has further discussed the variables declaration, significance of modularization and necessity of supporting accessories along with the usability of library files and the importance of the use of frameworks. Enhancement of coding formatting and significance of coding syntax were also critically reviewed with sufficient literature to identify the system implementation failures in the ERP development process.

OFDM System Implementation in DSP Platform TMS320C6678

The Orthogonal Frequency Division Multiplexing (OFDM) system is already used in commercial applications and is capable to deal with Intersymbolic Interference (ISI) caused by multipath channels. This system gained popularity after the application of the Fast Fourier Transform (FFT) and its inverse (IFFT) to modulate the signal in many subcarriers. This paper discusses implementation aspects of an OFDM system;such system is characterized by considering real constraints, including the memory consumption and the processing time. The OFDM modulator, channel samples and OFDM demodulator were implemented entirely in the DSP TMS320C6678 platform. As a proof-of-concept, a 256-QAM OFDM BER performance is compared with theoretical values. Moreover, the memory size is not demanding, consuming very few resources. It was observed a very high number of DSP clock cycles needed for the OFDM signal modulation, corresponding to more than 4 times the number used in demodulating the signal.

Study on a new chaotic bitwise dynamical system and its FPGA implementation

In this paper, the structure of a new chaotic bitwise dynamical system （CBDS） is described. Compared to our previous research work, it uses various random bitwise operations instead of only one. The chaotic behavior of CBDS is mathemat- ically proven according to the Devaney＇s definition, and its statistical properties are verified both for uniformity and by a comprehensive, reputed and stringent battery of tests called TestU01. Furthermore, a systematic methodology developing the parallel computations is proposed for FPGA platform-based realization of this CBDS. Experiments finally validate the proposed systematic methodology.

Hopf bifurcation analysis and circuit implementation for a novel four-wing hyper-chaotic system

In the paper, a novel four-wing hyper-chaotic system is proposed and analyzed. A rare dynamic phenomenon is found that this new system with one equilibrium generates a four-wing-hyper-chaotic attractor as parameter varies. The system has rich and complex dynamical behaviors, and it is investigated in terms of Lyapunov exponents, bifurcation diagrams, Poincare maps, frequency spectrum, and numerical simulations. In addition, the theoretical analysis shows that the system undergoes a Hopf bifurcation as one parameter varies, which is illustrated by the numerical simulation. Finally, an analog circuit is designed to implement this hyper-chaotic system.

Design, Analysis and Real-time Implementation of Networked Predictive Control Systems

这份报纸用预兆的控制策略涉及设计，分析和联网的控制系统的即时实现。联网的控制系统的特征的分析被详细说明，它证明一个联网的控制系统与常规控制系统不同。完成靠近环的联网的控制系统的需要的性能，联网的预兆的控制计划被介绍。设计，稳定性分析和联网的预兆的控制系统的即时实现被学习。它被联网的预兆的控制计划能补偿随机的网络通讯延期和数据退学学生的模拟和实际实验说明，完成需要的控制性能并且有好靠近环的稳定性。

Forming and implementing a hyperchaotic system with rich dynamics

A simple three-dimensional （3D） autonomous chaotic system is extended to four-dimensions so as to generate richer nonlinear dynamics. The new system not only inherits the dynamical characteristics of its parental 3D system but also exhibits many new and complex dynamics, including assembled 1-scroll, 2-scroll and 4-scroll attractors, as well as hyperchaotic attractors, by simply tuning a single system parameter. Lyapunov exponents and bifurcation diagrams are obtained via numerical simulations to further justify the existences of chaos and hyperchaos. Finally, an electronic circuit is constructed to implement the system, with experimental and simulation results presented and compared for demonstration and verification.

IMPLEMENTATION AND PERFORMANCE ANALYSIS OF ACCURATE LOCALIZATION OF SHORT-RANGE TARGETS BASED ON MULTISENSOR SYSTEMS

In this paper, the optimal estimate method is systematically investigated for estimating the position and velocity vectors of a short range target in space with a multisensor system TR n (one transmitting sensor and n receiving sensors). A suboptimal and realizable signal processing scheme is provided. The performance of the suboptimal procedure is analyzed theoretically in detail, and analytical expressions are obtained for the covariance matrix of the estimator error. Simulation results verify the theoretical prediction, which demonstrates the system is able to accurately locate a short range target.

Design and Implementation of Traceability Management System for Pigs Based on Personal Digital Assistant

The traceability management system for pigs based on personal digital assistant （PDA） was constructed by software engineering method to provide the traceability management for pork safety. This traceability system included information managements for pig breeding and pig quaran- tine inspection supervision. It also realized the record and supervision of pig information, feed usage, veterinary drug usage and quarantine inspec- tion. We mainly introduced the designs of systemic structure and functional structure of the traceability system and key techniques of system imple- mentation.

Implementation of Hierarchical and Distributed Control for Discrete Event Robotic Manufacturing Systems

The large scale and complex manufacturing systems have a hierarchical structure where a system is composed several lines with some stations and each station also have several machines and so on. In such a hierarchical structure, the controllers are geographically distributed according to their physical structure. So it is desirable to realize the hierarchical and distributed control. In this paper, a methodology is presented using Petri nets for hierarchical and distributed control. The Petri net representation of discrete event manufacturing processes is decomposed and distributed into the machine controllers, which are coordinated through communication between the coordinator and machine controllers so that the decomposed transitions fire at the same time. Implementation of a hierarchical and distributed control system is described for an example robotic manufacturing system. The demonstrations show that the proposed system can be used as an effective tool for consistent modeling and control of large and complex manufacturing systems.

Office Automation System for Enterprise Based-on .NET

A system-Asynchronous JavaScript and XML(AJAX)and a Model-View-Controller(MVC)pattern algorithm were proposed for design and implementation of an office automation(OA)system.Adopting the.NET framework as development platform,the system modifies the classic MVC pattern,induces AJAX in the ASP.NET 2.0,and includes several modules,namely login,messaging,notice board,personal work,research management,document management,personnel information and maintenance.We discussed the overall structure of the system,functional and database design.The main functions of several modules and their final realization are explained in details.The system yields high efficiency,along with features of clear frame,easy maintainability,reliability,etc.

基于System Generator的简化粒子滤波算法设计及硬件实现

针对粒子滤波计算量大、硬件实现困难的问题,提出了一种用于纯方位跟踪的简化粒子滤波算法,并通过Xilinx System Generator在FPGA上实现。首先,对通用粒子滤波算法进行适当简化,使其减少计算量并且易于硬件实现;其次,采用模块化设计,利用状态机综合并实现各个模块的时序控制;最后,转换为硬件语言,完成硬件仿真。仿真结果表明,所设计的简化粒子滤波算法各个模块工作正常,且具有较好的跟踪精度及运行速度,可用于非线性、非高斯系统的粒子滤波实现,对于粒子滤波的硬件实现方面具有一定的参考价值。

基于System Generator的数字滤波器实现与优化

FPGA是数字信号处理的理想器件,数字信号处理涉及到大量滤波器的设计与实现。本文详细介绍了基于System Generator的数字滤波器的设计与实现,并且根据FPGA的特性对滤波器进行了优化。

A new Rsslor hyperchaotic system and its realization with systematic circuit parameter design

Based on two modified Rosslor hyperchaotic systems, which are derived from the chaotic Rosslor system by introducing a state feedback controller, this paper proposes a new switched Rosslor hyperchaotic system. The switched system contains two different hyperchaotic systems and can change its behaviour continuously from one to another via a switching function. On the other hand, it presents a systematic method for designing the circuit of realizing the proposed hyperchaotic system. In this design, circuit state equations are written in normalized dimensionless form by rescaling the time variable. Furthermore, an analogous circuit is designed by using the proposed method and built for verifying the new hyperchaos and the design method. Experimental results show a good agreement between numerical simulations and experimental results.

Hyperchaos evolved from the Liu chaotic system

This paper introduces a new hyperchaotic system by adding an additional state into the third-order Liu chaotic system. Some of its basic dynamical properties, such as the hyperchaotic attractor, Lyapunov exponent, fractal dimension and the hyperchaotic attractor evolving into chaotic, periodic, quasi-periodic dynamical behaviours by varying parameter d are studied briefly. Various attractors are illustrated not only by computer simulation but also by conducting an electronic circuit experiment.

Fractional-Order Control for a Novel Chaotic System Without Equilibrium

The control problem is discussed for a chaotic system without equilibrium in this paper.On the basis of the linear mathematical model of the two-wheeled self-balancing robot,a novel chaotic system which has no equilibrium is proposed.The basic dynamical properties of this new system are studied via Lyapunov exponents and Poincar′e map.To further demonstrate the physical realizability of the presented novel chaotic system,a chaotic circuit is designed.By using fractional-order operators,a controller is designed based on the state-feedback method.According to the Gronwall inequality,Laplace transform and Mittag-Leffler function,a new control scheme is explored for the whole closed-loop system.Under the developed control scheme,the state variables of the closed-loop system are controlled to stabilize them to zero.Finally,the numerical simulation results of the chaotic system with equilibrium and without equilibrium illustrate the effectiveness of the proposed control scheme.

宜居宜业和美乡村建设水平评价与分类施策——以重庆市璧山区七塘镇为例

“建设宜居宜业和美乡村”是党的二十大对全面推进乡村振兴作出的战略部署.在阐释宜居宜业和美乡村科学内涵的基础上构建评价指标体系,以璧山区七塘镇为例开展实证研究,探讨建设宜居宜业和美乡村的实施路径.结果表明:(1)七塘镇宜居宜业和美乡村建设水平呈现“北高南低”的空间分布格局,总体建设位于中等水平,不同维度水平有差距.(2)分维度看,七塘镇生活维度水平最高,治理、人文和环境维度水平其次,产业维度水平最低.(3)分村域看,将军村、喜观村建设水平较高,四合村、阳岫村建设水平中等,盐店村、跃进村、建设村和三步梯村建设水平较低.(4)依据优势与短板,将七塘镇8个村划分为综合发展型、主导发展型、极化发展型和欠缺发展型4类,针对性地提出各类乡村建设宜居宜业和美乡村的实施路径,以期为推进宜居宜业和美乡村建设提供理论与实践指导.

边界与弹性:新时代教育评价改革的制度逻辑

新时代教育评价改革需要强化制度层面的认知与执行的双向路径,这正好切合于新制度主义理论关于制度研究主要关注的两个维度,一是属认知的制度分析、二是属实践的制度变迁。故此,在新制度主义理论的基础上,新时代教育评价改革需要依循制度“认知-执行”双向路径对应的“边界-弹性”的双层逻辑框架。认知层上,通过制度分析的相关理论分析,发现新时代教育评价改革的制度认知要基于边界逻辑,即执行主体要理清制度价值层面的“多元”价值边界、主体层面的“规范”权责边界、技术层面的“有限”技术边界,以塑造对制度的理性认知;实践层上,通过制度变迁的相关理论分析,发现新时代教育评价改革的制度执行要基于弹性逻辑,即在制度执行前秉持弹性理念、执行中开展弹性实践以及执行后进行弹性评价,以促使新时代教育评价改革充分落地。

基于System Generator的距离拖引干扰实现方法

在干扰系统的设计中,需要快速产生干扰信号和修改干扰参数以应对复杂的电磁环境。介绍了距离拖引干扰的原理及其现场可编程门阵列(FPGA)实现方法,并在此基础上阐明了基于System Generator的干扰模块的构造及验证方法。利用System Generator进行干扰系统的开发具有使用方便、可扩展性强等优点,克服了从抽象算法到可靠硬件电路跨领域的困难,节省了开发时间,并降低了设计出错的概率。测试结果证明,System Generator非常适合距离拖引干扰的FPGA实现。

新文科数学课程体系的构建与实施路径

在新文科建设与人才培养视域下,培养新型社会所需优秀文科人才的关键在于不同学科之间的交叉融合,而数学与文科的交叉融合尤为重要。随着社会的发展,文科专业对学生数学能力的要求不断提升,原有的文科数学课程在教学目标、教学内容和教学模式等方面已不能满足新文科专业建设与人才培养的需要。新文科数学课程体系要在融合与守正的平衡中建立新的目标,深入挖掘数学在新文科建设中的价值。在内容上进行更新或重构,在教学模式上紧跟教育数字化转型的步伐,重视数学技术的应用,构建适应新文科建设与发展要求的大学数学课程体系,发挥数学类优质课程与教材在培养高素质文科人才方面的积极作用。因此,在对新文科数学课程体系的构建依据和课程体系的构建理念、体系结构和课程设置进行深入分析的基础上,文章从教学目标、课程内容、新形态文科数学教材开发、数字化资源建设、考核评价模式和保障制度几个方面探讨了新文科大学数学课程体系的实施路径,并在吉林大学进行教学实践,取得了较好的效果。