西厢计划 西厢计划的最初理论来源 西厢计划的从理论到实践（墙外） 西厢计划原理简介
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偶然的机会了解到还有这么个计算机和通信界的研究热点（active research area），上网搜了点资料，放这备用！ 1. 发表在软件学报上的一篇论文：无线传感网络 一篇综述性质的文章 2. wiki上的简介，不过没太大的学术含量 3. 居然还有一个免费开源的模拟器！ WSN涉及到的路由协议真是不少啊： 平面路由协议 Flooding(泛洪) SPIN (sensor protocol for information via negotiation) SAR (sequential assignment routing) 定向扩散(directed diffusion) 层次路由协议 LEACH (low energy adaptive clustering hierarchy) TEEN (threshold sensitive energy efficient sensor network protocol) PEGAGIS (power-efficient gathering in sensor information system) [...] readwriteweb.com评出了2009年网络的五大流行方向，值得参考！ ReadWriteWeb’s Top 5 Web Trends of 2009: Structured Data The Real-Time Web Personalization Mobile Web & Augmented Reality Internet of Things TCP 协议的操作可以使用一个具有 11 种状态的有限状态机（ Finite State Machine ）来表示，图 1 描述了 TCP 的有限状态机，图中的圆角矩形表示状态，箭头表示状态之间的转换，各状态的描述如表 3-2 所示。图中用粗线表示客户端主动和被动的服务器端建立连接的正常过程：客户端的状态变迁用粗实线，服务器端的状态变迁用粗虚线。细线用于不常见的序列，如复位、同时打开、同时关闭等。图中的每条状态变换线上均标有“事件／动作”：事件是指用户执行了系统调用（ CONNECT 、 LISTEN 、 SEND 或 CLOSE ）、收到一个报文段（ SYN 、 FIN 、 ACK 或 RST ）、或者是出现了超过两倍最大的分组生命期的情况；动作是指发送一个报文段（ SYN 、 FIN 或 ACK ）或什么也没有（用“－”表示）。
图 1 TCP 有限状态机 What is a Web Server ?Visual Studio has its own ASP.NET Engine, which is responsible for running your web application so you don’t have any problems running an ASP.NET application from VS IDE. Now when you want to host your site for others to access, the concept of "Web Server" comes into the picture. A web server is responsible for all the requests that are coming from clients and provides them a response. So when multiple users come in, multiple requests will also come in and the web server will have a response for each of them. IIS (Internet Information Server) is one of the most powerful web servers from Microsoft that is used to host your ASP.NET web application. IIS has its own ASP.NET Process to handle the ASP.NET request. If you look at the picture,
Fig: IIS Server Overview The First Client will make a request to the web server (IIS), the web server checks the request and will pass the request to the ASP.NET Process (Don’t get confused here, I have explained the details), the ASP.NET process Engine will process the request and pass the response to the client via the Web server. So one of the major roles of IIS is handling each and every request. Don’t worry, I explained each and every thing in more detail later. So far, I hope it is clear why we are using a web server. 阅读全文 Beginner’s Guide : Exploring IIS 6.0 With ASP.NET(节选) (IIS 详解) As a preface to the series of articles I will be writing on the Value Proposition and Business Cases for Cloud Computing, I wanted to discuss the layers below and within the cloud. It is important to understand what each of the layers is composed of, what the intended function of that layer is, and how these layers interact with each other. By simplifying the cloud computing concept into layers, it is easier to define the roles within the overall structure and explain where your business fits into the model. Let me start by introducing a graphic I whipped up real fast. In the diagram below, you see that the cloud is basically a pyramid of technologies stacked in a certain order.
阅读全文 The Five Layers within Cloud Computing By Ernest de Leon |
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