Efficient Digital Twin Placement for Blockchain-Empowered Wireless Computing Power Network

As an open network architecture,Wireless Computing PowerNetworks(WCPN)pose newchallenges for achieving efficient and secure resource management in networks,because of issues such as insecure communication channels and untrusted device terminals.Blockchain,as a shared,immutable distributed ledger,provides a secure resource management solution for WCPN.However,integrating blockchain into WCPN faces challenges like device heterogeneity,monitoring communication states,and dynamic network nature.Whereas Digital Twins(DT)can accurately maintain digital models of physical entities through real-time data updates and self-learning,enabling continuous optimization of WCPN,improving synchronization performance,ensuring real-time accuracy,and supporting smooth operation of WCPN services.In this paper,we propose a DT for blockchain-empowered WCPN architecture that guarantees real-time data transmission between physical entities and digital models.We adopt an enumeration-based optimal placement algorithm(EOPA)and an improved simulated annealing-based near-optimal placement algorithm(ISAPA)to achieve minimum average DT synchronization latency under the constraint of DT error.Numerical results show that the proposed solution in this paper outperforms benchmarks in terms of average synchronization latency.

Analyzing and Seeking Minimum Test Instruction Set of Digital Signal Processor for Motor Control

The relativity of instructions of motor control digital signal processor (MCDSP) in the design is analyzed. A method for obtaining a minimum instruction set in plac e of the complete instruction set during generation of testing procedures is giv en in terms of the processor presentation matrix between micro-operators and in structions of MCDSP.

基于Digital Micrograph的Ti(C,N)基金属陶瓷材料定量金相分析

Ti(C,N)基金属陶瓷显微组织及相界面较复杂,需要一种简便、精确的定量金相方法来辅助研究.采用功能强大的Gatan Digital Micrograph软件对不同纳米添加量Ti(C,N)基金属陶瓷显微组织进行背底消除、滤波、二值化及图像形态学处理,分析可得到该金相图中的一些金相特征参数.对不同纳米添加量Ti(C,N)基金属陶瓷中硬质相进行了综合分析,结果表明,利用Gatan Digi-tal Micrograph软件实现Ti(C,N)基金属陶瓷显微组织的分析测量是完全可行的,能有效地提高工作效率及得到直观、准确的结果,也可定量地得到随纳米粉添加量的不断增加,硬质相颗粒的总体积不断减少,平均粒径也在不断减小.

Study of time-domain digital pulse shaping algorithms for nuclear signals

With the development on high-speed integrated circuit,fast high resolution sampling ADC and digital signal processors are replacing analog shaping amplifier circuit.This paper firstly presents the numerical analysis and simulation on R-C shaping circuit model and C-R shaping circuit model.Mathematic models are established based on 1st order digital differential method and Kirchhoff Current Law in time domain,and a simulation and error evaluation experiment on an ideal digital signal are carried out with Excel VBA.A digital shaping test for a semiconductor X-ray detector in real time is also presented.Then a numerical analysis for Sallen-Key(S-K) low-pass filter circuit model is implemented based on the analysis of digital R-C and digital C-R shaping methods.By applying the 2nd order non-homogeneous differential equation,the authors implement a digital Gaussian filter model for a standard exponential-decaying signal and a nuclear pulse signal.Finally,computer simulations and experimental tests are carried out and the results show the possibility of the digital pulse processing algorithms.

Intelligent customization of digital carpet based on C2B

New requirements have been put forward by the age of "Internet+" to improve the abilities of reform,transformation and innovation for traditional carpet industry in combining the technology of the fully digital fabric tufting and the system of networked intelligent customization that forms C2B mode of personalized customization of the digital carpet to promote the carpet industry to develop towards individuation,intelligence and high efficiency. Exploring the market background of C2B mode of intelligent customization of the digital carpet and developing the technology of the fully digital fabric tufting makes it possible to achieve personalized customization of the digital carpet. The industrial internet which is integrated by a lot of robots of the fully digital fabric tufting will change completely traditional carpet industry.

Digital arc welding power supply based on real-time operating system

A digital arc welding power supply was designed with the advanced reduced instruction set computer machine （ARM） and embedded real-time multi-task operating system micro C/OS- Ⅱ. The ARM, with its powerful calculating speed and complete peripheral equipments, is very suitable to work as the controller of the digital power supply. The micro C/OS- Ⅱ transplanted in ARM, helps to improve the respondent speed against various welding signals, as well as the reliability of the controlling software. The welding process consists of nine tasks. The tasks of great significance on reliability of the welder, for example, the A/D conversion of current and voltage, enjoy top priority. To avoid simultaneous-sharing on A/D converter and LCD module, two semaphores are introduced in to ensure the smooth performance of the welding power supply. Proven by experiments ,the ARM and the micro C/OS- Ⅱ can greatly improve both the respondent speed and the reliability of the digital welder.

The Design of Digital Excitation Regulator

The digital excitation regulator is very popular in the small electric plant. This kind of regulator can im- prove the working condition of generator and its working efficiency. It is on the base of the 80C51 Micro-con- troller. The regulator can automatically finish some functions through the combination of software and hard- ware. Through the experiment we can know it is more intellectual than the traditional analog excitation regu- lator.

Research on the Teaching System of Creative and Entrepreneurial Software Engineering(Digital Media Technology)Talents Training

The cultivation of innovative and entrepreneurial capability is a quality requirement of the times for the training of college and university talents. However, the regular teaching system universally has such problems as much more emphasis on theory than on practice, much more emphasis on inheritance than on innovation, and mismatching between talent training and market demand, so that a great number of graduates do not have enough innovative capacity, and it is very difficult for them to engage in related jobs of software engineering steadily and permanently. By investigating and analyzing similar majors of more than 20 schools at home and abroad, this article proposes a teaching system of talent training of the 3 C-cored major of "innovative and entrepreneurial" software engineering(digital media technology) based on regions, oriented to the industry and marked by school-enterprise linkage, and in connection with the characteristics of college and university education.

The Mathematical and Physical Theory of Rational Human Intelligence: Complete Empirical-Digital Properties;Full Electrochemical-Mechanical Model (Part I: Mathematical Foundations)

The design of this paper is to present the first installment of a complete and final theory of rational human intelligence. The theory is mathematical in the strictest possible sense. The mathematics involved is strictly digital—not quantitative in the manner that what is usually thought of as mathematics is quantitative. It is anticipated at this time that the exclusively digital nature of rational human intelligence exhibits four flavors of digitality, apparently no more, and that each flavor will require a lengthy study in its own right. (For more information,please refer to the PDF.)

Design of digital control DC voltage source based on AT89C52 MCU

the system to DC voltage source as the core, AT89C52 MCU as the main controller, the output voltage to set the DC power supply through the keyboard, with a step function voltage to reality, the actual output value. This design is divided into four modules： SCM control and display module, digital to analog （D/A） conversion module, a constant voltage source module, output module. MCU control module as the core, the input signal is converted to digital quantity output; constant current source module voltage D/A conversion to analog conversion into constant pressure through a constant voltage circuit. The system has good reliability, high precision.

Digital Instrumentation and Control System for Unit 5 ＆ 6 of YangJiang NPP

The article describes the digital instrumentation and control system for unit 5 ＆ 6 of YangJiang NPP, involving the overall I ＆ C （instrumentation and control） structure, the basic requirements and independent verification and validation. Advanced I ＆ C systems for YangJiang NPPs have to meet increasing demands for safety and availability. Additionally, the specific requirements coming from the nuclear qualification have to be fulfilled.

Comparative Study of Radiological Changes in Hands and Feet in Patients Suffering from Early Rheumatoid Arthritis by Power Doppler Ultrasound and Direct Digital Radiography

Rheumatoid arthritis is a chronic multisystem disease of unknown cause. The characteristic feature of RA is persistent inflammatory synovitis. The natural history of disease is such that the early months of the disease are critical period during which reversible joint damage occurs. So early diagnosis of RA and appropriate drug application is the only way to save a patient from this crippling disease. In India, the cost of investigations is a significant factor for most of the patients. Ultrasonography or Power Doppler Ultra Sound (PDUS) has the advantage of being economic in spite of its sensitivity in assessing both inflammatory and destructive changes. The aim of the present study was to evaluate the diagnostic efficiency of PDUS in early rheumatoid arthritis. The study was performed with the patients attending Rheumatology Clinic. A total number of 106 patients of clinically suspected rheumatoid arthritis were studied as per selection criteria. Radiological examinations of hands were done by digital radiography and PDUS in a group of 53 patients, assessment of foot changes by PDUS and Digital Radiography were done in another similar group of 53 patients. Final diagnosis by ACR EULAR-2010 criteria is done for all the patients. The comparative study reveals that synovial vascularity as demonstrated by PDUS is much more effective in diagnosing early rheumatoid arthritis, both in hand and in feet than digital radiograph. PDUS of feet may yield earlier and better findings than hands, which is conventionally used in patients suffering from early rheumatoid arthritis.

3D-DSA与Dyna-CT在颅内支架置入术中的临床应用研究

目的探讨三维DSA血管成像(3D-DSA)及数字平板造影机的C臂旋转并断层重建技术(DynaCT)在颅内支架置入术患者中的临床应用。方法选择2019年1月-2020年6月厦门大学附属中山医院收治92例颅内动脉狭窄患者,所有患者均行颅内支架置入术治疗,分为对照组(n=38例)和观察组(n=54例)。对照组采用3D-DSA引导,观察组采用DynaCT引导,术后进行12个月门诊随访,比较两组改良Rankin量表(mRS)评分、手术成功率、并发症、支架再狭窄及斑块检出率。结果观察组术后4个月、8个月及12个月mRS评分、支架成形术耗时低于对照组(P<0.05);观察组Dyna-CT的术前规划、观察到支架表面图像与术中所见吻合,手术成功率为83.33%,高于对照组63.16%(P<0.05);两组围术期并发症发生率无统计意义(P>0.05);观察组手术后进行12个月门诊随访,患者支架再狭窄、血管狭窄部位斑块检出率低于对照组(P<0.05)。结论DynaCT用于颅内支架置入术中能改善患者症状,缩短支架成形术耗时,有助于提高手术成功率,未增加并发症发生率,能降低血管狭窄部位斑块检出率,值得推广应用。

数字技术赋能PBL教学模式创新研究——以C语言程序设计课程为例

本文以C语言程序设计课程为例,探讨了数字技术如何赋能以问题为导向的学习(Problem-Based Learning,PBL)的教学模式创新。鉴于C语言程序设计课程在建设过程中,存在课程内容与思政内容融合不紧密、课程与数字技术结合实效性不强等问题,文章提出了PBL教学模式创新的目标,包括改革教学内容,将价值观的引导作为核心,将能力的提升作为主线,改革教学模式,通过理论教学与实践操作的有机结合,实现教学与育人的相互融合,文章阐述了课程思政融入教学内容、重构教学设计和调整课程评价等实践的过程。实践证明,此模式提高了学习效率,实现了个性化教学,增强了学生参与度,培养了学生自主学习能力和解决问题的能力,加强了学生的实践技能,增强了其团队合作精神。

一种基于ASLC的数字波束抗干扰改进算法研究

针对阵列雷达系统在自适应抗干扰处理过程中设备复杂度高、期望信号信噪比下降等问题,在自适应旁瓣对消(ASLC)理论基础上,研究了一种改进的数字抗干扰处理算法。该算法分析了辅助天线单元独立设计引起的空间资源占用等问题,通过在天线阵列中灵活选取数字单元形成辅助信号的方式,优化阵列资源的同时增加了主阵列与辅助单元收到的干扰信号相关性,提高了系统的干扰抑制比;根据最小均方误差准则对辅助信号进行预加权处理,削减辅助波束接收的期望信号能量,改善了由于辅助波束接收信号的自相关矩阵中含有期望信号引起的期望信号相消问题。通过系统测试,验证了该技术的有效性,实测结果表明,该算法在简化天线阵列设计的同时,干扰调零深度达到了51.6 dB,而期望信号信噪比仅损失0.65 dB,解决了传统ASLC算法效率下降的难题,具有广泛的工程应用前景。

数智化技术驱动下C语言程序设计课程教学改革研究

文章针对C语言程序设计课程教学中学习指导服务支持不足、教学资源和教育技术支撑不够、学习评价模式未能有效驱动学生能力发展等问题,以学生的编程能力培养为改革载体,通过能力分解和重构知识、以能力为导向建设学习资源库、建设数智技术平台和评价机制创新等改革措施,打造和形成驱动学生能力发展的学习评价模式,促进学习模式创新,解决课程教学中指导服务不足、技术支撑不够等问题,提升学生算法设计和编程的实践能力。

A Novel Power Optimization Method by Minimum Comparator Number Algorithm for Pipeline ADCs

The effects of stage numbers on power dissipation of pipeline analog-to-digital converter （ADC） are studied and a novel design method aiming for power optimization is presented. In this method, a minimum comparator number algorithm （MCNA） is first introduced, and then the optimum distribution of resolutions through pipeline ADC stages is deduced by MCNA. Based on the optimum stage-resolution distribution, an optimization method is established, which examines the precise function between ADC power and stage resolutions with a parameter of power ratio （Rp）. For 10-bit pipeline ADC with scaling down technology, the simulation results by using MATLAB CAD tools show that an eight-stage topology with 1-bit RSD correction achieves the power optimization indicated by the power reduction ratio.

基于Digital UNIX平台的实时数字引导实现方法

根据导弹飞行试验任务中对测控设备进行数字引导的实际需求,介绍了数字引导在飞行试验任务中的作用和基于Digital UNIX平台实现对测控设备数字引导的原理,从确保数字引导实时性、引导数据可靠性、引导外推点确定及修正引导方法四个方面介绍实现数字引导的关键技术,为导弹飞行试验任务中确保测量设备及时捕获和跟踪目标,成功地实现数字引导提供了实用的实现方法。

一种基于FVF动态缓冲器的二阶噪声整形SAR ADC

本文提出了一种高精度的二阶无源噪声整形逐次逼近型模数转换器(NS SAR ADC)。首先,采用了一种通过动态浮动反向放大器(FIA)实现kT/C噪声消除的技术,随后结合差分结构的定制电容,实现更小的电容阵列面积的同时抑制了采样热噪声。最后,采用翻转电压跟随器(FVF)结构作为动态缓冲器提取残差电压,并通过电容堆叠的操作实现无源求和,对比较器噪声与量化噪声进行了二阶整形。该设计采用0.18μm工艺实现,仿真表明,在1.8 V电源电压、8倍过采样率和2 MS/s的采样频率下,信号噪声失真比(SNDR)为88.57 dB,无杂散动态范围(SFDR)为99.09 dB,功耗仅为302μW。

Visual C_卄在数字图像增强中的应用

数字图像处理技术在医学、工业、军事等方面已经广泛应用。其经典算法有局部平均法、中值滤波、拉普拉斯算法等。VisualC 是Microsoft公司推出的编程工具 ,它是图形处理上具有很大优势的软件开发工具之一。VisualC 一个图形的开发界面 ,它提供了丰富的关于位图操作的函数 ,为开发图像处理系统提供了极大的方便。总之 ,利用VisualC 编程语言 ,结合经典的图像处理算法对图像进行拉普拉斯锐化等处理将取得良好效果。