Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-03-28 Cooperative journals: 《中国科学院院刊》
Abstract： Agricultural mechanization and intelligent agricultural machinery equipment are important basis for improving agricultural production efficiency and rural productivity, and changing the mode of agricultural development. In the past 70 years, China’s agricultural machinery industry has made remarkable achievements. It has become the largest agricultural machinery country in the world, though the backwardness before liberation. Nevertheless, there is still a huge technical gap between China and established powers in the field of agricultural machinery. “Big but not strong” has become the main feature at this stage. To realize the breakthrough “from big to strong” in agricultural machinery industry, the fundamental path is to establish an agricultural machinery innovation system suitable for China’s agricultural production operation mode. This study takes tractor as a typical representative of agricultural machinery industry, and reviews the development process of agricultural machinery industry system in China. Then we divide the agricultural machinery industry system of new China into different generations according to the technological development and the reform of land system. The aim and content of the new generation (third generation) agricultural machinery innovation system are described emphatically. We also discuss the application of new technology innovation system in the Yellow River Delta, and introduce how to build the application system of the third-generation agricultural machinery. Finally, some suggestions are given for the construction of the independent and controllable third generation agricultural machinery innovation system of China.
Subjects: Computer Science >> Computer Application Technology submitted time 2017-03-10
Abstract：有限的无线资源与不断增长的无线业务需求成为越来越突出的矛盾。怎样进一步提高频谱使用效率已成为未来无线技术研究的重要课题。受频谱资源以及独立优化架构的限制，现有的无线网络将很难进一步提高空中接口的频谱效率和网络的整体性能。为从根本上提高无线频谱利用的效率，需要使网络中的各元素进行智能协作，从而达到网络资源共享、提高传输可靠性和系统吞吐量、有效改善用户服务质量。这 就是先进无线协作通信技术。本文对无线协作通信技术进行了较系统的总结和介绍。
Peer Review Status:
Awaiting Review
Subjects: Computer Science >> Computer Application Technology submitted time 2017-03-10
Abstract：在异构网络不断发展的今天，如何融合不同无线接入技术，为用户提供更多样化的业 务形式和更好的用户质量体验成了亟待解决的问题。本文从接入层面对新一代融合通信网络 中空中接口协议栈系统进行分析，阐述设计过程中的技术难点并提出对应解决方案。后， 提出面向新一代融合通信的协议栈系统架构。
Peer Review Status:Awaiting Review
Subjects: Computer Science >> Computer Application Technology submitted time 2017-03-10
Abstract：本文分析了现有无线通信网络在系统架构方面面临的挑战。对一种全新的接入网络架构——基于云型基础设施的接入网进行了简介，针对有关重点研究内容进行了分析。后描 述了该新型架构技术演化路径和验证的可行方案。
Peer Review Status:Awaiting Review
Subjects: Computer Science >> Computer Application Technology submitted time 2017-03-10
Abstract：本文首先分析了无线通信技术研究中常用的仿真方法和当前主流的仿真软件，然后对第四代移动通信标准进行了简介，后重点阐述了中科院计算技术研究所无线通信技术研究中心研制的面向第四代移动通信系统的空中接口仿真平台，特别是该系统的整体架构、设计特点和关键技术，包括多场景支持、链路抽取方法及增强多天线技术等。
Peer Review Status:Awaiting Review
Subjects: Computer Science >> Computer Application Technology submitted time 2017-03-10
Abstract：随着我国高速铁路和宽带无线通信技术的发展，在高铁环境下提供宽带无线通信的需求日益强烈。目 前高铁采用的窄带 GSM-R（Global System for Mobile Communications on Railways）只能提供 200kbps 以下 的数据传输速率，无法满足未来高铁展开视频监控、旅客多媒体等新业务的需求。必须发展面向高铁优化的宽带无线通信系统，才能为高铁的运营、控制，为旅客提供稳定，可靠，高质量的宽带无线通信服务。本文针对高铁高速移动、位置可预期等特点，分析了面向高铁的宽带无线通信系统在网络架构、资源管理 和物理层空口等核心技术上面临的挑战，并提出了解决问题的思路。
Peer Review Status:Awaiting Review
Subjects: Computer Science >> Computer Network submitted time 2017-03-10
Abstract：依然基于停等模式。对于大规模系统，停等模式在很大程度上会影响程序的并行效率。本文提出了一种非 停等的算法级容错策略——热替换策略。在程序运行过程中若发生节点失效，不用停等恢复失效节点上的 数据，而用冗余节点替换失效节点，使计算能继续进行。终的正确结果可以通过一个线性变换求出。为 了论证方案的有效性，我们结合 MPICH 的容错特性实现了容错的 High Performance Linpack (HPL)，并评估 了方案的性能。实验结果表明，即使在小规模下，我们的方案的性能也明显优于算法失效恢复技术。
Peer Review Status:Awaiting Review
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