Network Execution Environment Research Articles

맞춤형 통신 프로토콜과 서비스를 위한 액티브 네트워크 실행환경

In this paper, we present the design and implementation of new execution environment named Customizable Architecture for Flexible Execution Environment(CAFEs) that supports the mechanism of protocol customization and service referencing. We introduce a new concept as micro protocols and active services to enhance software reusability. Micro protocol represents a specific algorithm or functionality of existing network protocol and the active service is in charge of binding legacy application and releasing the active network oriented services. The pro-posed active network execution environment is made up of three parts, virtual network system, protocol and service manager, event engine. First, the virtual network system is used to connect each active nodes using virtual network channels which are based on multiple existing protocol layers. Second, the protocol and service manager is responsible for composing micro protocols and active services to develop new network proto-col and service easily. Finally, the event engine is used to detect the automatic transition of system components using event delegation model. To verify the CAFTs, we have an experiment about the delivery of web contents which are suitable for the user`s terminals in the wireless Internet environment. As a result. we are able to obtain the availability of developed execution environment.

Model checking active networks with SPIN

Recent advances in languages and execution environments (EEs) for active networks make it now possible to develop applications with this new exciting approach. In particular, active networks have proven to be very suitable for multicast services. Nevertheless, to open the network nodes to the code written by users requires the use of analysis techniques to avoid the degradation of the network performance. Model checking is one of the most powerful techniques to ensure software reliability. This technique has been successfully applied to many protocols developed with the classic (non-active) approach. Our aim is to extend its application to the area of active protocols. The paper consists of two main contributions: (a) a clear scheme to use the language promela in order to formalize different elements in the active service (network EE, capsules and user applications) and (b) the practical (and successful) application of the approach to analyze an active multicast protocol using the model checker spin.