CAREER: Opportunistic Middleware for Delay-Tolerant Networks

0844850Christine Julien德克萨斯大学奥斯汀分校：延迟容忍网络的机会主义中间件由于发送者和接收者之间经常长时间断开连接，延迟容忍网络的特征是连接的极端不可预测性。这种类型的网络已变得越来越重要，这在很大程度上要归功于新兴的应用，如支持偏远地区的互联网访问、社交网络以及移动搜索和救援。现有的解决方案通常是针对非常特定的应用程序定制的，而不是一般地关注应用程序属性。智力上的功绩。该项目利用应用程序的共同特征，通过简化应用程序开发并提供支持新型流动和响应性应用程序的表现力，来推动对延迟容忍网络的协调支持的开发。该项目首先通过发展通信方之间临时延长的对话理论来发展对延迟容忍网络中的协调的理解。为了支持这些对话，该研究还研究了如何创建新的通信协议，以适应不断变化的条件下的行为，使通信基础设施能够继续满足应用程序的要求，即使网络的运行条件发生了变化。为了支持这种适应，该项目开发了上下文感知的新概念，即收集和解释有关应用程序环境的信息的能力。该项目将这三个组件结合在一起，为延迟容忍网络创建了一个自适应中间件，该中间件提供了一个软件支持系统，使应用程序开发人员能够使用简单的构造来创建可表达的协调应用程序。更广泛的影响。该项目包括一项教育议程，该议程依靠这些可容忍延迟网络的有形应用程序，通过实际操作演示和课程项目，增加学生和公众使用移动计算的机会。

0844850Christine JulienUniversity of Texas at AustinCAREER: Opportunistic Middleware for Delay-Tolerant NetworksDelay-tolerant networks are characterized by extreme unpredictability of connectivity due to disconnections between senders and receivers that often persist for long periods of time. This style of network has become increasingly important, largely due to emerging applications, such as enabling access to the Internet in remote areas, social networking, and mobile search and rescue. Existing solutions are generally tailored to very specific applications, instead of focusing on application properties in general. Intellectual Merit. This project uses applications' common characteristics to drive the development of coordination support for delay-tolerant networks by simplifying application development and providing an expressiveness that enables new classes of fluid and responsive applications. The project begins by developing an understanding of coordination in delay-tolerant networks by developing a theory of temporally extended conversations among communicating parties. To support these conversations, the research also examines the creation of new communication protocols that adapt their behavior in response to changing conditions, enabling the communication infrastructure to continue to meet applications' requirements, even as the network's operating conditions change. To support this adaptation, the project develops new notions of context-awareness, or the ability to collect and interpret information about an application's environment. The project ties these three components together to create an adaptive middleware for delay-tolerant networks that provides a software support system that enables application developers to use simple constructs to create expressive coordinating applications. Broader Impact. The project includes an education agenda that relies on these tangible applications for delay-tolerant networks to increase the accessibility of mobile computing to students and the public through hands-on demonstrations and course projects.