中文摘要：

研究了普适服务协同机理，结合普适环境下情境信息的特点，提出了情境感知的普适服务平台PerServ．用户通过平台提供的接口提交任务，系统解析用户任务，并将其指派给当前可用的普适服务．该平台能够有效获取、管理和使用情境信息．服务组合过程考虑了服务功能，而服务执行过程则进一步考察了服务的情境信息，以此构建服务路径，在运行时根据情境信息的变换，动态演绎服务路径，从而有效满足用户需求．PerServ平台在实现中采用agent技术，服务agent用于设备管理和服务注册，并且实时接收系统的指令，执行相应的服务，服务agent在多个服务协同工作过程中起到了服务协调者的作用．

英文摘要：

The cooperation of pervasive services is studied. A context-aware service platform PerServ is proposed in terms of characteristic of context information. User submits requirement through the portal, then system parses user＇s task and appoints the task to available pervasive service. The platform is able to require, manage and use context effectively. The service composition process considers the service function while service execution process builds service paths based on the context of service and dynamically involves the service path in accordance with the change of context, so that to satisfy user＇s requirement. PerServ employs agent technology to achieve the function. Service agent is used in device management and service registration. It also receives instructions and invokes related service, which serves as an intermediation among services.