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—J2EE model and technology, and the concept and structure of MVC pattern, are introduced in this paper. Based on the four-tier J2EE architecture and the MVC pattern, a technology roadmap of the e-Commerce system architecture is planned out: JSP plus Servlet plus Session Bean plus CMP plus Database, which makes up the shortcomings of unclear business logic(More)
In this paper we present a probabilistic broadcast calculus for mobile and wireless networks whose connections are unreliable. In our calculus, broad-casted messages can be lost with a certain probability, and due to mobility the connection probabilities may change. If a network broadcasts a message from a location, it will evolve to a network distribution(More)
Probabilistic automata (PA) [20] have been successfully applied in the formal verification of concurrent and stochastic systems. Efficient model checking algorithms have been studied, where the most often used logics for expressing properties are based on PCTL [11] and its extension PCTL * [4]. Various behav-ioral equivalences are proposed for PAs, as a(More)
This paper presents a formal characterisation of safety and liveness properties for fully probabilistic systems. As for the classical setting, it is established that any (probabilistic tree) property is equivalent to a conjunction of a safety and liveness property. A simple algorithm is provided to obtain such a property decomposition for flat probabilistic(More)
The following full text is a preprint version which may differ from the publisher's version. Abstract. The spectrum of branching-time relations for probabilistic systems has been investigated thoroughly by Baier, Hermanns, Katoen and Wolf (2003, 2005), including weak simulation for systems involving substochastic distributions. Weak simulation was proven to(More)
We introduce a continuous time stochastic broadcast calculus for mobile and wireless networks. The mobility between nodes in a network is mod-eled by a stochastic mobility function which allows to change part of a network topology depending on an exponentially distributed delay and a network topology constraint. We allow continuous time stochastic behavior(More)