First Discussion About Virtual Maintenance Technology Application in Civil Aviation
Virtual maintenance is one of the most important research directions of virtual reality technology,and is widely used in the areas such as research and teaching,aerospace and industry production. Research status of virtual maintenance both at home and abroad was analyzed and summarized. Definition and key technology of virtual maintenance was introduced. Realization flow of virtual maintenance simulation was summarized. In the view of virtual maintenance study purposes,based on the key technology,combined with the examples at home and abroad,numerous practices involved in civil aviation were investigated. Influence and effect of related technology upon civil aviation was analyzed and summarized. Finally,the prospect of the future application in civil aviation area was also presented.
In view of the limitations of Synthetic Aperture Radar(SAR) in monitoring oil spill,this paper proposes that the gray-degree spatial distribution and structure characteristic of pixels should be considered in the classification. Meantime,texture-involving Support Vector Machine(SVM) classification method in remote sensing image processing is suggested in identification of oil slick to solve the problem of insufficient sample numbers.The oil spill accident of ship "Prestige" happened in Spain is taken as the example.The analysis of texture features that are extracted from target samples by GLCM indicates that mean,contrast,variance,entropy,and dissimilarity are effective for oil slick identification.Three methods: minimum distance,Maximum likelihood,and SVM are used to extract oil slick respectively.The results show that SVM has superior classification accuracy.