Foliage and violence: Interrogating forests as a security threat in Nigeria

The discourse on security challenges in Nigeria has generated much scholarly insight. What is yet to be sufficiently interrogated is the place of forests in the problem. Situating the problem within the context of global occurrences, the study explores security threats posed by the poor management of some Nigerian forests, which has resulted in invasion and exploitation by criminals who engage in militancy, kidnapping, ritual killing, armed robbery, cattle rustling and cannabis cultivation. Using the theory of ungoverned spaces as a foundation, the study locates the major reason for the invasion and use of forested landscape for criminal activities in the Nigerian state, the presence of the authorities in these sanctuaries is either non-existent or, at best, sporadic.     

基于随机森林法的机械变速箱技术状态评估

将随机森林RF(Random Forests)引入到机械设备技术状态评估领域,对某型坦克不同劣化程度的变速箱振动加速度信号数据进行分类研究,分类精度达到97%以上,证实了此方法的有效性。基于RF的评估方法具有组合分类器精度高、树型分类器运行速度快的特点,在机械设备状态识别、故障诊断中表现出了良好的性能。