Water Science and Engineering 2008, 1(3) 73-82  DOI:   10.3882/j.issn.1674-2370.2008.03.008   ISSN: 1674-2370 CN: 32-1785/TV

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rough set
information entropy
critical engineering factor
crack opening
Dongjian ZHENG
Article by
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An information-based rough set approach to critical engineering factor identification

Ji JING*1, 2, Dongjian ZHENG1, 2

1. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, P. R. China
2. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing 210098, P. R. China


In order to analyze the main critical engineering factors, an information-based rough set approach that considers conditional information entropy as a measurement of information has been developed. An algorithm for continuous attribute discretization based on conditional information entropy and an algorithm for rule extraction considering the supports of rules are proposed. The initial decision system is established by collecting enough monitoring data. Then, the continuous attributes are discretized, and the condition attributes are reduced. Finally, the rules that indicate the action law of the main factors are extracted and the results are explained. By applying this approach to a crack in an arch gravity dam, it can be concluded that the water level and the temperature are the main factors affecting the crack opening, and there is a negative correlation between the crack opening and the temperature. This conclusion corresponds with the observation that cracks in most concrete dams are influenced mainly by water level and temperature, and the influence of temperature is more evident.

Keywords rough set   information entropy   critical engineering factor   crack opening  
Received 2008-05-21 Revised 2008-07-22 Online:  
DOI: 10.3882/j.issn.1674-2370.2008.03.008
Corresponding Authors: Ji JING
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