MODELING AND PERFORMANCE ANALYSIS FOR THE SERIAL AND PARALLEL PRODUCTION SYSTEM BASED ON GSPN

Differed from the existed applications of generalized stochastic Petri net(GSPN) theory in machine-tool manufacturing system, reliability computation of FMS, testabilityparameters determination and fault analysis, a new idea of applying GSPN to model and performanceanalysis for the serial and parallel production system is proposed. And one typical discrete eventdynamic system (DEDS), turner-unit of palletizing system, is taken as a real case to research. Basedupon the established GSPN models, the working performances of serial and parallel layout arecompared. Furthermore, their differences of working mechanisms including feeding mechanism,coordinating mechanism and monitoring mechanism are discussed. Thus the theoretical basis which ishelpful to appraise layout plan and its reasonableness is provided. Meanwhile, the research resultsshow that parallel layout is more advantageous to greatly improve the operational speed ofproduction system than serial one.

3-PRS serial-parallel machine tool error calibration and parameter identification

3-PRS serial-parallel machine tool consists of a 3-degree-of-freedom (DOF) implementation platform and a 2-DOF X-Y platform. The error modeling and parameter identification methods were deduced based on 3-PRS serial-parallel machine tool. 3-PRS serial-parallel machine tool was researched, and the mechanism of error analysis, modeling, identification of error parameters and measurement equipment for the use of agency error of measurement were conducted. In order to achieve the geometric parameters calibration and error compensation of the serial-parallel machine tool, the nominal structural parameters of the controller was adjusted by identifying the structure of the machine tool. With the establishment of a vector space size chain, we can do the error analysis, error modeling, error measurement and error compensation can be done.

Improved Hungarian algorithm for assignment problems of serial-parallel systems

In order to overcome the shortcoming of the classical Hungarian algorithm that it can only solve the problems where the total cost is the sum of that of each job, an improved Hungarian algorithm is proposed and used to solve the assignment problem of serial-parallel systems. First of all, by replacing parallel jobs with virtual jobs, the proposed algorithm converts the serial-parallel system into a pure serial system, where the classical Hungarian algorithm can be used to generate a temporal assignment plan via optimization. Afterwards, the assignment plan is validated by checking whether the virtual jobs can be realized by real jobs through local searching. If the assignment plan is not valid, the converted system will be adapted by adjusting the parameters of virtual jobs, and then be optimized again. Through iterative searching, the valid optimal assignment plan can eventually be obtained.To evaluate the proposed algorithm, the valid optimal assignment plan is applied to labor allocation of a manufacturing system which is a typical serial-parallel system.

Research of 6-DOF Serial-Parallel Mechanism Platform for Stability Training of Legged-Walking Robot

The concept of legged-robot stability training with a training platform is proposed and a serial-parallel mechanism platform with 6 degrees of freedom is designed for this target. The designed platform is composed of 4-DOF parallel mechanism with spherical joints and prismatic pairs,and 2-DOF serial mechanism with prismatic pairs. With this design,the platform has advantages of low platform countertop,big workspace,high carrying capacity and high stiffness. On the basis of DOF analysis and computation of space mechanism,weight supporting auxiliary mechanism and raceways-balls supporting mechanism are designed,so as to improve the stiffness of designed large platform and payload capacity of servo motors. And then the whole structure design work of the platform is done. Meanwhile,this paper derives the analytical solutions of forward kinematics, inverse kinematics and inverse dynamics. The error analysis model of position and orientation is established. And then the simulation is done in ADAMS to ensure the correctness and feasibility of this design.

On the Metaheuristics Approach to the Problem of Genetic Sequence Comparison and Its Parallel Implementation

We describe parallel implementation of the metaheuristic approach to the problem of comparing strings representing DNA sequence. By this approach, one can define a whole new class of metrics on a set of strings;some of this metrics can lead to interesting results when used for string comparison. We propose several heuristics;compare results achieved when using those heuristics and compare parallel and sequential implementation of proposed approach.

A Trace-state Based Approach to Specification and Design of Parallel Programs

In this paper they deal with the issue of specification and design of parallel communicatingprocesses. A trace-state based model is introduced to describe the behaviour of concurrent programs. They presenta formal system based on that model to achieve hierarchical and modular development and verification methods. Anumber of refinement rules are used to decompose the specification into smaller ones and calculate program fromthe

Numerical Methods for Solving Turbulent Flows by Using Parallel Technologies

Parallel implementation of algorithm of numerical solution of Navier-Stokes equations for large eddy simulation (LES) of turbulence is presented in this research. The Dynamic Smagorinsky model is applied for sub-grid simulation of turbulence. The numerical algorithm was worked out using a scheme of splitting on physical parameters. At the first stage it is supposed that carrying over movement amount takes place only due to convection and diffusion. Intermediate field of velocity is determined by method of fractional steps by using Thomas algorithm (tridiaginal matrix algorithm). At the second stage found intermediate field of velocity is used for determination of the field of pressure. Three dimensional Poisson equation for the field of pressure is solved using upper relaxation method. Moreover various ways of geometrical decomposition for parallel numerical solution of three dimensional Poisson equations are investigated.

Parallelism and Optimization of Numerical Ocean Forecasting Model

According to the characteristics of Chinese marginal seas, the Marginal Sea Model of China(MSMC) has been developed independently in China. Because the model requires long simulation time, as a routine forecasting model, the parallelism of MSMC becomes necessary to be introduced to improve the performance of it. However, some methods used in MSMC, such as Successive Over Relaxation(SOR) algorithm, are not suitable for parallelism. In this paper, methods are developedto solve the parallel problem of the SOR algorithm following the steps as below. First, based on a 3D computing grid system, an automatic data partition method is implemented to dynamically divide the computing grid according to computing resources. Next, based on the characteristics of the numerical forecasting model, a parallel method is designed to solve the parallel problem of the SOR algorithm. Lastly, a communication optimization method is provided to avoid the cost of communication. In the communication optimization method, the non-blocking communication of Message Passing Interface(MPI) is used to implement the parallelism of MSMC with complex physical equations, and the process of communication is overlapped with the computations for improving the performance of parallel MSMC. The experiments show that the parallel MSMC runs 97.2 times faster than the serial MSMC, and root mean square error between the parallel MSMC and the serial MSMC is less than 0.01 for a 30-day simulation(172800 time steps), which meets the requirements of timeliness and accuracy for numerical ocean forecasting products.

基于累加式实时串并联变换算法的机械故障声学监测方法

针对基于物联网(IoT)的冲压机床故障监测问题,为了降低冲压机床故障监测的计算复杂度,并提高其低频识别的精度,提出了一种无需机器学习技术的实时性机械故障声学监测方法,即基于累加式实时串并联变换算法的机械故障声学监测方法。首先,研究了物联网场景中冲压机床声学低频分析的必要性,并给出了声学信号的表达式;然后,针对频率轴上多个周期信号重叠导致参数估计较为困难的问题,提出了一种累加式实时串并联变换算法,将输入的采样序列馈入多个具有不同输出端口的串并转换器,从累加的波形中检测出最大绝对值,并进行了比较;最后,通过样本时隙划分,将累加式实时串并联变换算法应用于机械故障监测;通过仿真和冲压机床实机测试,对累加式实时串并联变换算法和实时性机械故障声学监测方法的有效性进行了验证。研究结果表明:在无需大量信号样本的情况下,使用累加式实时串并联变换算法有利于提高低频带的识别精度;在直方图相关性方面,累加式实时串并联变换算法和Morlet小波变换具有相同的性能,且均明显优于短时傅立叶变换;同时,尽管累加式实时串并联变换算法需要的加法总数比Morlet小波变换多2.5倍,但是乘法总数减少了20447%,大幅减少了计算的复杂度。

平行药物系统:基于大语言模型和三类人的框架与方法

近年来,随着物联网、大语言模型、多模态交互等新一代人工智能技术的迅猛发展,传统的药物研发、生产加工等过程面临着智能化转型的挑战。为此,以平行智能为理念,基于ACP方法和大语言模型提出了虚实交互的平行药物系统,并将三类人(数字人、机器人和生物人)的概念引入系统中,详细阐述了该系统的理论框架与构建方法。平行药物系统涵盖医药产业的全流程,药物研发阶段考虑了药物发现、实验室研究、临床试验等过程;药物生产加工阶段考虑了制药工厂运行、系统分析预测等方面;药物医疗保健阶段考虑了个性化用药咨询、增强现实用药指导、隐私安全等内容。平行药物系统打造了一个数字化的“药物空间”,旨在建立药物系统的新范式,推动智能化药物的革命。

56 Gbit/s低功耗分数间隔FFE PAM4 SerDes发射机设计

采用65 nm CMOS工艺设计了一款用于高速芯片互联的四电平脉冲幅度调制(PAM4) SerDes发射机。该发射机主要由最高有效位通道和最低有效位通道、时钟产生路径、前馈均衡模块、接口驱动电路等构成。采用一种无锁存的并串转换技术,以降低功耗;采用一种分数型前馈均衡技术,获得了超出奈奎斯特频率点的频率补偿峰值,从而扩展频率补偿范围,使输出信号能更好地适应信道。此外,采用带预充电结构的4∶1并串转换器,减小电荷共享效应对电路的影响。仿真结果表明,在1 V电源电压下,整体电路能实现56 Gbit/s PAM4输出信号,输出眼图清晰,且获得电平失配率为93.1%的高线性度,输出摆幅达到480 mV,功耗为75 mW。

平行音乐:大模型时代的人机混合音乐创演

随着声音艺术等垂直领域基础模型的迅速发展,人工智能与音乐创作表演呈现愈发融合的趋势。面向音乐创演的流程与需求,提出新型音乐创演框架——平行音乐系统,该系统基于平行系统理论与人工社会、计算实验和平行执行方法,通过模拟真实世界的音乐创演环境,构建高度逼真的虚拟音乐创演场景,在虚拟和真实音乐系统间实现实时无缝交互,设计大模型时代音乐创演的人工系统、计算实验、平行执行各环节技术路线,形成由自然人、数字人、机器人组成的人机混合音乐创演团队。阐述了平行音乐的理论框架和关键技术,分析其在现代音乐领域中的创新意义和潜在价值,并探讨了平行音乐在乐曲生成和音乐治疗等场景中的应用案例。旨在利用大模型时代的人工智能技术赋能传统音乐创作路径,推动音乐创演的技术革新进程,释放音乐家的艺术创新潜力,以期为新时代音乐创演提供新视角与启发。

基于小生境协同互联的黑启动网架重构策略研究

随着电网规模的扩大,大停电引发的后果愈发严重,黑启动是重启瘫痪电网的有效措施,网架重构是黑启动过程的重要环节。为提高大停电后电力系统的黑启动效率,充分利用分布式黑启动电源在网架恢复过程中的优势,提出了基于小生境协同互联的黑启动网架重构策略。借助图论中的Kruskal算法,以节点和支路权重为导向对待恢复网架进行图抽象,并以网架恢复时间最短为主要目标,构建黑启动网架重构优化模型。在排挤和预选择的双机制作用下,采用改进小生境遗传算法对该模型进行求解,在此基础上融入串并行配合的恢复策略实现小生境协同互联。由上述求解过程,达到对网架重构过程的优化调节。通过与改进前方法的对比,用恢复时间、电压偏移量和有功损耗的指标对IEEE 39仿真结果进行评价,结果表明所提方法能有效提高网架重构速度,保证协同互联的稳定。同时,借助江苏省某市局部电网数据,证实了所建模型的有效性和可行性。

平行旅游:基础智能驱动的智慧出游服务

旅游作为一种满足人们对不同生活体验和知识需求的活动,对经济、文化等领域都产生了深远影响。随着物联网、多模态大语言模型等技术的迅速发展,传统的旅游业难以满足人们智能化以及个性化的旅游需求。为此,以平行智能为理念,基于ACP方法与多模态大语言模型提出了虚实交互的个性化旅游服务系统,通过构建旅游大模型,并结合检索增强生成方法和多智能体协作系统,打造个性化旅游服务的新范式。此外,探讨了平行旅游的应用生态,从“行”“住”“食”“衣”4个方面对整个旅游生态进行拓展,分析了其他行业与个性化旅游服务的融合。平行旅游将为旅游行服务业的发展带来全新可能。

自行加榴炮系统反应时间优化研究

武器系统反应时间是反映武器装备自动化水平和火力反应能力的重要战技指标。针对某大口径自行加榴炮系统反应时间过长、作战效率较低、无法适应现代战场需求的问题,推导了操瞄解算模型,按照操瞄解算模型自动调炮,研究了操瞄调炮与弹药装填机构动作的特点和时长,设计分步并行的方法,优化了调炮动作与装填动作的联动过程,并进行试验对比分析。试验结果表明,相较于传统方法,优化后的方法使得该型自行加榴炮的平均系统反应时间减少了7.02 s,系统反应速度提高了32.3%,使之可以快速、高效地完成规定的战术动作,明显提升其战场生存能力和作战效率。

Chiplet技术发展与挑战

随着半导体工艺尺寸逐渐逼近物理极限,芯片的功耗、性能和面积随工艺制程进步而带来的提升越来越小,半导体技术进入“后摩尔时代”。为进一步满足机器学习与人工智能等信息通信行业快速发展带来的高带宽通信需求,基于先进的互连和封装技术的Chiplet技术步入了我们的视野。Chiplet技术将原来的复杂多功能SoC芯片拆成多个小面积、低成本、不同工艺节点的小芯片,再进行重新组装,因其良率高、成本低、集成度高、性能强大、灵活性好、上市时间快等优点受到学术界和产业界的高度关注。本文对Chiplet的技术特征、优势、发展历史以及具体应用进行了梳理和阐述,同时详细介绍了Chiplet的关键核心技术尤其是Chiplet D2D互连技术,最后叙述了Chiplet现存的技术问题与挑战,并给出了未来发展建议。

Chiplet技术:拓展芯片设计的新边界

芯粒(Chiplet)是一种将多个小型芯片集成为一个完整的系统芯片的技术,旨在实现芯片的重用、异构集成、性能提升和成本降低等目标。该技术的发展重点主要包括异构集成、新型互连和新型封装。其中,接口互连是Chiplet技术的关键。接口互连包括物理层接口和数据传输协议,接口和协议的设计需要考虑工艺技术、封装技术、功耗限制和上层应用程序的要求等,串行互连和并行互连是芯片到芯片实体层接口的两种选择。此外,对于不同的传播介质,应运而生出一些新型的互连技术,如光互连和无线互连,它们可以提供更高的带宽、更低的功耗和更灵活的互连拓扑。未来,Chiplet技术有望为电子领域带来重大的突破和发展,促使更加高效、灵活和富有创新性的芯片设计和制造。

基于领域分析的结构线性静力软件串并行一致化方法

并行CAE软件的计算结果串并行一致性是其计算结果可信的必要条件。然而,软件研发时常引入串并行不一致缺陷,其形式众多,现象相互耦合,散布于海量代码中,成为实现CAE软件串并行一致性的挑战。文中以结构线性静力软件的串并行一致性需求为切入点,针对现有的“专家知识法”与“缺陷定位法”应用于CAE软件串并行一致化时存在的粒度粗、准度差、成本高和缺乏系统性问题,引入领域分析方法,并与专家知识和数据流状态比对结合,提出了一种适用于结构线性静力的串并行一致化方法,实现了结构线性静力软件串并行不一致缺陷的细粒度、高准度与低成本系统性识别与修复。基于前述方法形成相关工具,并将方法与工具应用于SSTA的串并行一致化,识别并修复其中8处串并行不一致缺陷,使其通过90余真实模型的串并行一致考核,并实现串并行结果严格一致;同时,该方法与工具还将串并行不一致缺陷定位耗时由平均大于两人天降低至数人时。

项目化教学在“电工电子技术”的实践与探索--以任务“电阻的串并联分析”为例

“电工电子技术”是高职工科装备制造大类基础课,其理论知识多,学习难度大。通过分析教学内容、教师教学方法和学生学习特点,遵循“理实一体化”基本理念,采用以项目化教学法为主,辅助以任务驱动教学法。结合课程内容和电工考证内容,确定了3个项目和11项任务,以子任务“电阻的串并联分析”为例说明具体实施步骤,将理论知识和实操训练结合,做到“做中学,做中教”,以增强学生的专业能力,持续改进教学质量。

应用于红外读出电路的LVDS接收电路设计

在大规模红外读出电路中,接口电路的数据传输效率及接口数量尤为关键。传统接口电路采用并行接口进行数据传输,这种方式会占用较多的芯片引脚。为了提升数据的传输效率,设计了一款用于数据接收的3通道串行低压差分信号(Low Voltage Differential Signaling, LVDS)接口电路。电路采用0.18um互补金属氧化物半导体(Complementary Metal Oxide Semiconductor, CMOS)工艺设计。仿真结果表明,LVDS接口电路在400 MHz频率下,能够将2路接收端数据转换为8路数据并将其输出给内部数字处理单元。与传统并行接口相比,本电路节省了6个数据传输引脚,大大提高了数据传输效率。