关键词: 网络情境, 云模型, 情境建模

Abstract: As Internet is open, dynamic and difficult to control, the values of network contextual parameters and their changes show uncertain characteristics, which impacts importantly the execution and management of software systems on Internet. Based on the analysis of practical Internet application requirements, this paper proposes a new complex network context assessment scheme, by making use of the advantages of cloud model in transformation between qualitative concepts and quantitative values. It profiles the features of multi-dimensional network context factors, and achieves the quantitative mapping between the multi-dimensional contextual parameters and the assessment of run-time network environment. By adding the user tolerant error into calculation to adjust the number of samples dynamically, more stable and accurate assessment results can be obtained. The scheme achieves the modeling results at both parameter-level and group-level, which brings a better overall evaluation of the network status as well as helps to improve the correctness and efficiency of dynamical software reconfiguration. The effect of the scheme has been verified through a series of simulation experiments.

Key words: network context, cloud model, context modeling