Towards sustainable industry 4.0: A green real-time IIoT multitask scheduling architecture for distributed 3D printing services

As the keystones of the personalized manufacturing, the Industrial Internet of Things (IIoT) consolidated with 3D printing pave the path for the era of Industry 4.0 and smart manufacturing. By resembling the age of craft manufacturing, Industry 4.0 expedites the alteration from mass production to mass customization. When distributed 3D printers (3DPs) are shared and collaborated in the IIoT, a promising dynamic, globalized, economical, and time-effective manufacturing environment for customized products will appear. However, the optimum allocation and scheduling of the personalized 3D printing tasks (3DPTs) in the IIoT in a manner that respects the customized attributes submitted for each model while satisfying not only the real-time requirements but also the workload balancing between the distributed 3DPs is an inevitable research challenge that needs further in-depth investigations. Therefore, to address this issue, this paper proposes a real-time green-aware multi-task scheduling architecture for personalized 3DPTs in the IIoT. The proposed architecture is divided into two interconnected folds, namely, allocation and scheduling. A robust online allocation algorithm is proposed to generate the optimal allocation for the 3DPTs. This allocation algorithm takes into consideration meeting precisely the customized user-defined attributes for each submitted 3DPT in the IIoT as well as balancing the workload between the distributed 3DPs simultaneously with improving their energy efficiency. Moreover, meeting the predefined deadline for each submitted 3DPT is among the main objectives of the proposed architecture. Consequently, an adaptive real-time multi-task priority-based scheduling (ARMPS) algorithm has been developed. The built ARMPS algorithm respects both the dynamicity and the real-time requirements of the submitted 3DPTs. A set of performance evaluation tests has been performed to thoroughly investigate the robustness of the proposed algorithm. Simulation results proved the robustness and scalability of the proposed architecture that surpasses its counterpart state-of-the-art architectures, especially in high-load environments.     

基于VxWorks的嵌入式计算机系统的设计与实现

该文介绍了基于VxWorks实时多任务操作系统的嵌入式计算机系统设计与实现的过程,包括底层软件设计和应用软件开发与维护的方法和过程。     

A sparse nonparametric hierarchical Bayesian approach towards inductive transfer for preference modeling

In this paper, we present a novel methodology for preference learning based on the concept of inductive transfer. Specifically, we introduce a nonparametric hierarchical Bayesian multitask learning approach, based on the notion that human subjects may cluster together forming groups of individuals with similar preference rationale (but not identical preferences). Our approach is facilitated by the utilization of a Dirichlet process prior, which allows for the automatic inference of the most appropriate number of subject groups (clusters), as well as the employment of the automatic relevance determination (ARD) mechanism, giving rise to a sparse nature for our model, which significantly enhances its computational efficiency. We explore the efficacy of our novel approach by applying it to both a synthetic experiment and a real-world music recommendation application. As we show, our approach offers a significant enhancement in the effectiveness of knowledge transfer in statistical preference learning applications, being capable of correctly inferring the actual number of human subject groups in a modeled dataset, and limiting knowledge transfer only to subjects belonging to the same group (wherein knowledge transferability is more likely).     

企业管理信息系统中的实时多任务实现

通过对TSR(驻留程序)的分析,讨论了企业管理信息系统中DOS磁盘操作系统工作站上实现实时多任务系统的原理及具体实现时的关键技术。     

51单片机多任务编程设计及应用

本文论述了在51系列单片机系统中,一种多任务系统编程设计方法。该方法不基于实时操作系统RTOS分时操作的思路和采用中断切换任务。本文通过一个具有4位LED数码显示,12键的键盘扫描和用串行口与其它系统交换数据的简单系统为例,说明该方法编程具有硬件设计简单、单片机工作效率高,实时性强等特点。该方法编程采用汇编语言,但根据相同的原理和思路,也不难用到C51语言编程上面。     

低功耗智能热能表的设计

低功耗系统以其高可靠性，低电磁污染，使用和携带方便而成为现代电子的普遍追求，通过低功耗智能热能表的研制过程介绍，阐述了MCU最小功耗系统的硬件，软件设计原则，并介绍了一种低工作频率下的软件设计技巧。     

操作系统多任务应用模式实验开发

多个任务的并发执行是计算机操作系统的一个主要特征,为了满足Windows下分时多任务,或实时多任务应用系统的开发,给出通过C程序设计对操作系统中多任务并发执行设计模式开发,提出Windows下利用时钟中断方式进行多任务并发执行的方法。该模式实现系统内多任务在宏观上的"同时"运行,解决Windows环境下用户应用开发自己的分时,或实时多任务应用系统的一般方法和结构。     

基于Windows平台的CNC实时多任务设计

分析Ｗｉｎｄｏｗｓ的消息机制和中断机制,结合ＤＰＭＩ接口给出一种在Ｗｉｎｄｏｗｓ操作系统下中断程序的设计方法。介绍在Ｗｉｎｄｏｗｓ操作系统下ＣＮＣ多任务调度以及在Ｗｉｎｄｏｗｓ平叶下开发数控系统实现实时多任务的方法,有较强的实用性。     

实时嵌入式系统中的一种互斥方法

本文分析了实时嵌入式操作系统中几种常用的互斥方法,提出了一种基于任务优先级的禁止抢占法,并分析了该方法的安全性和高效性。     

实时多任务操作系统RTK86的设计

本文叙述实时多任务操作系统ＲＴＫ８６的设计思想及其特点，主要阐述了自底向上、面向硬件的实时内核的设计