雲端計算是一個新的觀念，它代表所有的資料與計算都可以透過網路服務的機制來進行運算。Amazon所提出的彈性運算 (Elastic Computing) 可以依照使用者不同的需求而提供不同的計算資源，因此很適合用在雲端計算的環境中。不過大部分的雲端服務無法提供一個與別人隔離且可以自行定義的網路環境。因此，這篇論文針對這個問題進行研究，並研發了一個稱為SAMEVED的系統來提供使用者自行定義的雲端網路與運算環境。SAMEVED整合了VPN (virtual private network) 和虛擬路由器的功能，並提供適當的網路安全機制，讓使用者可以透過SAMEVED所提供的雲端服務平台自行建立、管理虛擬資料中心。在這個系統中，每個使用者都必須通過身份認證和授權才能使用這個雲端服務平台，而且不同的使用者身份可以使用到不同的功能。此外，這個系統還提供了簡單易操作的使用者介面和Remote API，讓使用者可以很容易地操作這個系統。

Cloud computing is an emerging computing paradigm that provides all kinds of services through the Internet. Existing elastic computing approaches are popular in cloud computing. They can fulfill the requirements of some cloud applications, but usually fail to provide an isolated computing environment consisting of connected virtual machines over a user-defined network topology. This paper presents a system architecture, namely SAMEVED, which provides a cloud service that can allocate and manage a private, virtual elastic datacenter by integrating VPN and virtual routers into existing virtualization technologies. Authentication and authorization are required by user login while using SAMEVED. A user-friendly web interface and remote API is provided to support different operations for different users with different privileges.

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