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MIL-STD-1553B总线是一种时分制,命令/响应,集中控制式多路传输的半双工串行数据总线,已被广泛的应用在舰船上。在简单介绍1553B总线系统和消息传输以及字的格式的基础上,讨论了利用仿真/测试卡实现舰船总线系统监控测试软件的设计,此方法不仅能对1553B总线上传输的消息进行监控,还可以对消息源码进行解析。 相似文献
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通过简化偶合器勺管与旋转外壳的位置关系,建立勺管与旋转外壳干涉的数学模型,建立优化目标函数和约束条件,编制优化程序及优化处理,将优化结果与实际产品的设计参数进行比较,并将优化结果进行三维建模.结果表明:优化结果正确,优化程序可以应用于系列偶合器优化,为设计提供最优化的设计参数. 相似文献
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In 3G networks upgraded with high speed packet access (HSPA) technology, the high access bandwidth and advanced mobile devices
make it applicable to share large files among mobile users by peer-to-peer applications. To receive files as quickly as possible
is essential for mobile users in file sharing applications, since they are subject to unstable signal strength and battery
failures. While many researches present peer-to-peer file sharing architectures in mobile environments, few works focus on
decreasing the time spent in disseminating files among users. In this paper, we present an efficient peer-to-peer file sharing
design for HSPA networks called efficient file sharing (EFS) for 3G networks. EFS can decrease the dissemination time by efficiently
utilizing the upstream-bandwidth of mobile nodes. It uses an adaptive rearrangement of a node’s concurrent uploading transfers,
which causes the count of the node’s concurrent uploading transfers to lower while ensuring that the node’s upstream-bandwidth
can be efficiently utilized. Our simulations show that, EFS achieves much less dissemination time than other protocols including
Bullet Prime and a direct implementation of BitTorrent for mobile environments. 相似文献
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许多人都有这样的感受,自己的操作系统重新安装了没有多久,运行速度就变得很慢.怎样使操作系统的运行速度加快呢?通常的方法有两种:一种是通过手动修改系统配置文件;一种是使用维护软件来调整手动状态.着重介绍第一种操作系统加速的方法. 相似文献
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结合一个实例,描述了如何正确处理Oracle数据库中数据文件不能自动扩充的问题,以及对这个问题处理不当所造成的后果和解决方法. 相似文献
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