Risk evaluation model for radiation protective countermeasures based on fuzzy entropy weight
On the basis of establishing a risk assessment index system, a model for assessing the risk of radiation protective countermeasures is proposed by introducing a fuzzy mathematics method and entropy weight theory, and the risk order of the radiation protective countermeasures is ranked by their entropy weight coefficients, which solves the decision problem of uncertain and fuzzy indexes in the risk assessment index system and could provide the decision-making basis for commanders in the process of nuclear accident rescue. The illustrative case study shows that the model could use the inherent information of the indexes adequately, and makes risk assessment for radiation protective countermeasures more reasonable, practicable and scientific.
Optimization Model for Locating City Fire Stations Based on Fuzzy Matter-Element Analysis
In view of the defects of location model for city fire stations with a simple evaluation index, an optimization model for locating city fire stations based on fuzzy matter-element analysis and Euclid approach degree is proposed in the paper. The model considers multiple evaluation indexes that incorporate both travel times and travel distances from stations to demand sites. In addition, the model considers other cost-related indexes. The weights of evaluation indexes are determined by information entropy and the scoring by experts, which could not only make full use of the inherent information of the indexes adequately, but reduce experts’ subjective assumption effectively. The result of the model indicates that the fuzzy matterelement analysis model seems to be an ideal technique that is applicable to the location problem of city fire station.
Satellites and Education in Australia--Learning from International Experience
Australia's domestic satellite service, AUSSAT, began operating in August 1985 and will be fully operational with the launch of the third satellite in late 1986. An examination of international educational satellite systems relevant to primary and secondary education in Australia is presented. Information collected and analysed is intended to inform decision-making.