课程文献中心 更多>>

关键词： 操作系统  

ISBN: (纸本)9787115561077

摘要： 本书介绍了统信UOS操作系统的应用方法，以及基本的管理和维护方法。全书共10章，主要内容包括计算机操作系统概述、操作系统安装与DDE桌面环境、文件管理、DDE桌面环境与功能设置、网络基础知识与网络设置、网络应用与网络共享设置、应用商店与系统维护工具、多媒体软件与辅助系统工具、安装Windows应用软件、命令行模式与shell的应用。

关键词： Urban metro lines   Fully automatic operation   Vehicle and crew scheduling   Column generation  

摘要： With the rapid development of fully automated urban metro lines, unattended train operation has become a reality, leading to significant gains in efficiency in comparison with traditional operation. To make better use of this technology and reduce operational costs, this study proposes a novel approach for collaboratively optimizing both vehicle and crew scheduling on metro lines. This approach is based on the assumption that unattended train movement without passengers is permitted, while the in-service train requires supervision by the crew. By considering the characteristics of urban metro lines, a mathematical model that considers both the meal activity and employee deadheading for the integrated vehicle and crew scheduling problem is first formulated. The model consists of a master problem for minimizing the total cost and subproblems for generating duties. The subproblem is constructed using a connection-based network and modeled as a special resource-constrained shortest path problem. To solve the model efficiently, a two-phase pricing procedure, which combines a piece generation phase and a duty generation phase, is developed to price out duties with negative reduced costs. Finally, numerical experiments based on actual conditions are conducted. The results indicate that our proposed model provides a significantly tight linear relaxation with negligible, typically zero, optimality gaps. Moreover, in comparison with the traditional integrated formulation, our proposed model and algorithm achieve improved performance in terms of solution quality and computing time.

关键词： Lightweight manycore processor   Network-on-chip   Distributed operating system   Message-passing communication  

摘要： Lightweight manycore processors deliver high performance and scalability by bundling in a single chip hundreds of low-power cores, a distributed memory architecture and Networks-on-Chip (NoCs). Operating Systems (OSes) for these processors feature a distributed design, in which a communication layer enables kernels to exchange information and interoperate. Currently, this communication infrastructure is based on mailboxes, which enable fixed-size message exchanges with low latency. However, this solution is suboptimal because it can neither fully exploit the NoC nor efficiently handle the diversity of OS communication protocols. We propose an Inter-Kernel Communication (IKC) facility that exposes two kernel-level communication abstractions in addition to mailboxes: syncs, for enabling a process to signal and unlock another process remotely, and portals, for handling dense data transfers with high bandwidth. We implemented the proposed facility in Nanvix, the only open-source distributed OS that runs on a baremetal lightweight manycore, and we evaluated our solution on a 288-core processor (Kalray MPPA-256). Our results showed that our IKC facility achieves up to 16.87x and 1.68x better performance than a mailbox only solution, in synchronization and dense data transfers, respectively. (C) 2021 Elsevier Inc. All rights reserved.

关键词： BASIC语言  

ISBN: (纸本)9787122388919

摘要： 本书力求帮助读者快速了解Gambas的语法规则、语言特色、GUI程序开发规范，掌握Gambas的基本程序设计方法，内容包括Gambas集成开发环境与程序打包发布、数据类型与结构化程序设计、窗体设计、基本控件使用、图像处理与图形绘制、消息框与对话框、键盘与鼠标事件以及流操作等。

关键词： 机器人  

ISBN: (纸本)9787111689157

摘要： 本书首先介绍GoPiGo3及其配备的传感器和执行器。然后，通过从零开始创建3D模型并使用Gazebo在ROS中运行模拟机器人来使用GoPiGo3的数字孪生模型。接下来展示如何使用GoPiGo3构建和运行一个了解周围环境的自主移动机器人。还探索了机器人如何学习尚未在代码中编程但通过观察其环境而获得的任务。

关键词： 互联网络   智能技术  

ISBN: (纸本)9787115561046

摘要： 本书基于华为LiteOS编写, 循序渐进地带领读者利用华为LiteOS快速开发自己的物联网产品, 内容讲解上逐步递进。首先讲解物联网的典型案例、物联网的技术架构、产品开发流程, 以及华为公司全套物联网解决方案的主要产品。然后深入浅出地讲述操作系统的原理, 以及物联网操作系统的发展历程、特征特点。随后开始聚焦华为LiteOS的软件框架进行讲解, 分别细致解读了LiteOS的内核源代码和外围组件源代码。最后在介绍本书所使用的硬件平台和移植技术的基础上, 以温湿度传感器的实战案例讲解了基于LiteOS和华为云IoT的物联网解决方案的开发过程, 并在本书最后一章介绍了LiteOS的后续发展方向。

摘要： An abstract is not available for this content so a preview has been provided. As you have access to this article, a PDF of this content is available in through the ‘Save PDF’ action button.

关键词： 物流行业   智慧火花   快递   原子化   中国古代传说   物联网终端   自主知识产权   操作系统  

摘要： 继鸿蒙系统Harmony OS 2.0正式发布引爆市场之后,"快递100"近日宣布加入鸿蒙生态,上线Harmony OS原子化服务,再次引发物流行业热潮。"鸿蒙",是中国古代传说中的一个时代,产生于混沌之前,既寓意了宇宙初生的征兆,又有浩然广大的意境。华为鸿蒙系统的诞生,一方面标志着我国已经具有了自主知识产权的物联网终端操作系统,以后不用担心被西方卡脖子。