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Quantitative evaluation of model consistency evolution in compositional service-oriented simulation using a connected hyper-digraph
Lin-jun Fan, Yun-xiang Ling, Xing-tao Zhang, Jun Tang
Front. Inform. Technol. Electron. Eng., 2014, 15(1): 1-12.
https://doi.org/10.1631/jzus.C1300089
Appropriate maintenance technologies that facilitate model consistency in distributed simulation systems are relevant but generally unavailable. To resolve this problem, we analyze the main factors that cause model inconsistency. The analysis methods used for traditional distributed simulations are mostly empirical and qualitative, and disregard the dynamic characteristics of factor evolution in model operational running. Furthermore, distributed simulation applications (DSAs) are rapidly evolving in terms of large-scale, distributed, service-oriented, compositional, and dynamic features. Such developments present difficulty in the use of traditional analysis methods in DSAs, for the analysis of factorial effects on simulation models. To solve these problems, we construct a dynamic evolution mechanism of model consistency, called the connected model hyper-digraph (CMH). CMH is developed using formal methods that accurately specify the evolutional processes and activities of models (i.e., self-evolution, interoperability, compositionality, and authenticity). We also develop an algorithm of model consistency evolution (AMCE) based on CMH to quantitatively and dynamically evaluate influencing factors. Experimental results demonstrate that non-combination (33.7% on average) is the most influential factor, non-single-directed understanding (26.6%) is the second most influential, and non-double-directed understanding (5.0%) is the least influential. Unlike previous analysis methods, AMCE provides good feasibility and effectiveness. This research can serve as guidance for designers of consistency maintenance technologies toward achieving a high level of consistency in future DSAs.
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有稳定和不稳定子系统的非线性脉冲切换系统的指数稳定性
Xiao-li Zhang, An-hui Lin, Jian-ping Zeng
Front. Inform. Technol. Electron. Eng., 2014, 15(1): 31-42.
https://doi.org/10.1631/jzus.C1300123
研究目的:对一类同时包含稳定和不稳定子系统的切换非线性系统的稳定性及鲁棒稳定性进行研究。旨在针对在切换时刻包含非线性脉冲,且每个子系统都具有非线性级联形式的切换非线性系统,给出其稳定的充分条件,为此类系统的稳定性问题研究提供理论依据。 重要结论:将在切换线性系统切换时刻的非线性脉冲处理方法和手段推广至切换非线性系统中。在应用非线性系统的Lyapunov函数处理非线性脉冲时,适当地利用了矩阵不等式的相关方法。当不稳定子系统和稳定子系统的活跃时间小于一定比例,并且在切换时刻存在满足相应界的非线性脉冲时,切换非线性系统仍能保持其指数稳定性。在不确定性满足相应界的条件下,切换非线性系统也能保持其鲁棒指数稳定性。
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6 articles
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