Announcing Amazon CloudFront Streaming, EC2 Spot Instances, and VPC Unlimited Beta

AWS宣布推出三项新服务:Amazon CloudFront支持音视频流传输,让流媒体发布变得简单;Amazon EC2 Spot Instances允许用户通过竞价方式获取未使用的EC2容量,大幅降低计算成本;Amazon VPC无限公共测试版开放,提供企业级安全隔离云资源。

Cool stuff.

 


 

Dear AWS Customers,

 

Today, we are pleased to share with you three exciting releases: Amazon CloudFront streaming, Amazon Elastic Compute Cloud (Amazon EC2) Spot Instances, and Amazon Virtual Private Cloud (Amazon VPC) unlimited public beta.

 

Amazon CloudFront Streaming


Amazon CloudFront, the easy-to-use content delivery service, now supports the ability to stream audio and video files. Traditionally, world-class streaming has been out of reach of many customers -- running streaming servers was technically complex, and customers had to negotiate long-term contracts with minimum commitments in order to have access to the global streaming infrastructure needed to give high performance.

 

We've designed Amazon CloudFront to make streaming accessible for anyone with media content. Streaming with Amazon CloudFront is exceptionally easy: with only a few clicks on the AWS Management Console or a simple API call, you'll be able to stream your content using a worldwide network of edge locations running Adobe's Flash® Media Server. And, like all AWS services, Amazon CloudFront streaming requires no up-front commitments or long-term contracts. There are no additional charges for streaming with Amazon CloudFront; you simply pay normal rates for the data that you transfer using the service.

 

Visit the Amazon CloudFront page to learn more.

 

Amazon EC2 Spot Instances

 

Spot Instances are a new way to purchase and consume Amazon EC2 Instances by allowing you to bid on unused Amazon EC2 capacity and run those instances for as long as your bid exceeds the current Spot Price. The Spot Price changes periodically based on supply and demand, and when your bid meets or exceeds the Spot Price, you'll gain access to the available Spot Instances (paying only the Spot Price, regardless of what amount you bid). These instances will continue to run until you choose to terminate the instances, or your maximum bid falls below the Spot Price (whichever is sooner). Spot Instances are complementary to On-Demand Instances and Reserved Instances, providing another option for obtaining compute capacity.

 

If you have flexibility in when your applications can run, Spot Instances can significantly lower your Amazon EC2 costs. Additionally, Spot Instances can provide access to large amounts of additional capacity for applications with urgent needs. A few examples of categories of applications well suited to Spot Instances include image and video processing, conversion and rendering, scientific research data processing, and financial modeling and analysis.

 

Visit the Amazon EC2 Spot Instances page to learn more and get started using this new pricing feature.

 

Amazon VPC Unlimited Public Beta


We're also announcing unlimited access to Amazon VPC. Amazon VPC offers a secure and seamless bridge between your company's existing IT infrastructure and the AWS cloud. Amazon VPC enables enterprises to connect their existing infrastructure to a set of isolated AWS compute resources via a Virtual Private Network (VPN) connection, and to extend their existing management capabilities such as security services, firewalls, and intrusion detection systems to include their AWS resources. Since August, Amazon VPC has been in a limited beta and today, all current and future Amazon EC2 customer accounts are enabled to use the service.

 

Visit the Amazon VPC page to learn more.

 

It has been an exciting December, and we hope you find these new AWS capabilities useful in your applications and for your business.

 

Sincerely,

The Amazon Web Services Team

 

基于51单片机,实现对直流电机的调速、测速以及正反转控制。项目包含完整的仿真文件、源程序、原理图和PCB设计文件,适合学习和实践51单片机在电机控制方面的应用。 功能特点 调速控制:通过按键调整PWM占空比,实现电机的速度调节。 测速功能:采用霍尔传感器非接触式测速,实时显示电机转速。 正反转控制:通过按键切换电机的正转和反转状态。 LCD显示:使用LCD1602液晶显示屏,显示当前的转速和PWM占空比。 硬件组成 主控制器:STC89C51/52单片机(与AT89S51/52、AT89C51/52通用)。 测速传感器:霍尔传感器,用于非接触式测速。 显示模块:LCD1602液晶显示屏,显示转速和占空比。 电机驱动:采用双H桥电路,控制电机的正反转和调速。 软件设计 编程语言:C语言。 开发环境:Keil uVision。 仿真工具:Proteus。 使用说明 液晶屏显示: 第一行显示电机转速(单位:转/分)。 第二行显示PWM占空比(0~100%)。 按键功能: 1键:加速键,短按占空比加1,长按连续加。 2键:减速键,短按占空比减1,长按连续减。 3键:反转切换键,按下后电机反转。 4键:正转切换键,按下后电机正转。 5键:开始暂停键,按一下开始,再按一下暂停。 注意事项 磁铁和霍尔元件的距离应保持在2mm左右,过近可能会在电机转动时碰到霍尔元件,过远则可能导致霍尔元件无法检测到磁铁。 资源文件 仿真文件:Proteus仿真文件,用于模拟电机控制系统的运行。 源程序:Keil uVision项目文件,包含完整的C语言源代码。 原理图:电路设计原理图,详细展示了各模块的连接方式。 PCB设计:PCB布局文件,可用于实际电路板的制作。
【四旋翼无人机】具备螺旋桨倾斜机构的全驱动四旋翼无人机:建模与控制研究(Matlab代码、Simulink仿真实现)内容概要:本文围绕具备螺旋桨倾斜机构的全驱动四旋翼无人机展开研究,重点进行了系统建模与控制策略的设计与仿真验证。通过引入螺旋桨倾斜机构,该无人机能够实现全向力矢量控制,从而具备更强的姿态调节能力和六自由度全驱动特性,克服传统四旋翼欠驱动限制。研究内容涵盖动力学建模、控制系统设计(如PID、MPC等)、Matlab/Simulink环境下的仿真验证,并可能涉及轨迹跟踪、抗干扰能力及稳定性分析,旨在提升无人机在复杂环境下的机动性与控制精度。; 适合人群:具备一定控制理论基础和Matlab/Simulink仿真能力的研究生、科研人员及从事无人机系统开发的工程师,尤其适合研究先进无人机控制算法的技术人员。; 使用场景及目标:①深入理解全驱动四旋翼无人机的动力学建模方法;②掌握基于Matlab/Simulink的无人机控制系统设计与仿真流程;③复现硕士论文级别的研究成果,为科研项目或学术论文提供技术支持与参考。; 阅读建议:建议结合提供的Matlab代码与Simulink模型进行实践操作,重点关注建模推导过程与控制器参数调优,同时可扩展研究不同控制算法的性能对比,以深化对全驱动系统控制机制的理解。
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