移动计算环境下的个人化服务发布和组装

随着移动计算技术的发展,移动设备用户可以服务的方式共享移动设备及其周围设备的计算能力和计算资源.然而,移动设备的私有性、资源受限性以及移动性等特征使得这种基于移动设备提供的个人化服务在发布和组装方面存在着一些特殊问题,例如用户隐私、移动设备资源消耗、网络环境变化引起的失效问题等.针对以上这些问题,提出一种移动计算环境下的个人化服务发布和组装方法.该方法在个人化服务发布过程中引入了服务意愿的概念,并在服务选择过程中综合考虑了服务意愿和服务效用.此外,还提出了资源感知的心跳机制来定期更新服务选择所依赖的设备及服务状态信息,从而解决由于网络环境变化等引起的服务失效问题.基于该方法,提出了一个基于JADE和OSGi的实现框架.通过一个案例分析,验证了所提出的实现框架的有效性以及在移动计算环境下考虑服务意愿的合理性.

Personal Service Publishing and Composition in Mobile Computing Environment

With the rapid development of mobile computing techniques, mobile users can share the computing capability and resource of their mobile devices and other surrounding devices as services. However, privately-owned, resource-constrained and portable mobile devices pose challenge to the publishing and composition processes of such personal services. Specifically, such personal services may intrude the privacy of the providers, consume the constrained computing resource, and suffer failures caused by the changing network environment. To address these problems, this paper proposes a new approach for personal service publishing and mixed service composition in mobile computing environment. This approach introduces the concept of service willingness during personal service publishing, and takes into account both service willingness and service utility during service selection. Further, it presents a resource-aware heartbeat mechanism to periodically update the status of devices and services for service selection, which can also help settling service failures caused by the changing network environment. Based on JADE and OSGi, it offers an implementation framework for the proposed approach. Finally, a case study is provided to show the effectiveness of the proposed implementation framework and the rationales for considering service willingness in mobile computing environment.