The Oak Ridge National Laboratory (ORNL) is the largest and most diverse energy, research, and development institution within the Department of Energy (DOE) system in the United States. As such, the site endures const...The Oak Ridge National Laboratory (ORNL) is the largest and most diverse energy, research, and development institution within the Department of Energy (DOE) system in the United States. As such, the site endures constant land development that creates rigorous growing conditions for urban vegetation. Natural resource managers at ORNL recognize that trees are an integral component of the landscape and are interested in characterizing the urban forest and their associated ecosystem services benefits. We evaluated the urban forest structure, quantified ecosystem services and benefits, and estimated economic value of resources using i-Tree Eco at ORNL. While this assessment captured over 1100 landscape trees, the ORNL Natural Resources Management for landscape vegetation can be expanded to include unmanaged landscapes, e.g. riparian areas, greenspace, and other vegetative attributes to increase ecosystem services benefits. Assigning a monetary value to urban forest benefits help to inform decisions about urban forest management, ideally on cost-benefit analysis.展开更多
T-S模糊故障树是由一系列具有IF-THEN规则的T-S逻辑门构成的故障树,可以解决复杂系统可靠性分析中故障多态、故障机理不明确、底事件失效率难以精确得知的问题。目前该方法主要分析系统中的功能故障问题。实际中,复杂多态系统内部很多...T-S模糊故障树是由一系列具有IF-THEN规则的T-S逻辑门构成的故障树,可以解决复杂系统可靠性分析中故障多态、故障机理不明确、底事件失效率难以精确得知的问题。目前该方法主要分析系统中的功能故障问题。实际中,复杂多态系统内部很多故障常常会造成性能降级,出现多性能状态,进而系统在不同的故障状态下具有不同的性能可靠性。通过对T-S模糊故障树所表示的系统赋予性能变量及故障多态下的不同性能值,利用统计学中的期望思想,提出一种分析系统故障多态下的性能可靠性方法,以及已知某一底事件或中间事件在故障状态下分析系统性能可靠性的方法。通过对目前大型飞机上常用的航空电子交互式以太网(Avionics full duplex switched ethernet,AFDX)进行分析建树,利用该方法求解系统在多故障状态下的性能可靠性,进行了实例分析。展开更多
文摘The Oak Ridge National Laboratory (ORNL) is the largest and most diverse energy, research, and development institution within the Department of Energy (DOE) system in the United States. As such, the site endures constant land development that creates rigorous growing conditions for urban vegetation. Natural resource managers at ORNL recognize that trees are an integral component of the landscape and are interested in characterizing the urban forest and their associated ecosystem services benefits. We evaluated the urban forest structure, quantified ecosystem services and benefits, and estimated economic value of resources using i-Tree Eco at ORNL. While this assessment captured over 1100 landscape trees, the ORNL Natural Resources Management for landscape vegetation can be expanded to include unmanaged landscapes, e.g. riparian areas, greenspace, and other vegetative attributes to increase ecosystem services benefits. Assigning a monetary value to urban forest benefits help to inform decisions about urban forest management, ideally on cost-benefit analysis.
文摘T-S模糊故障树是由一系列具有IF-THEN规则的T-S逻辑门构成的故障树,可以解决复杂系统可靠性分析中故障多态、故障机理不明确、底事件失效率难以精确得知的问题。目前该方法主要分析系统中的功能故障问题。实际中,复杂多态系统内部很多故障常常会造成性能降级,出现多性能状态,进而系统在不同的故障状态下具有不同的性能可靠性。通过对T-S模糊故障树所表示的系统赋予性能变量及故障多态下的不同性能值,利用统计学中的期望思想,提出一种分析系统故障多态下的性能可靠性方法,以及已知某一底事件或中间事件在故障状态下分析系统性能可靠性的方法。通过对目前大型飞机上常用的航空电子交互式以太网(Avionics full duplex switched ethernet,AFDX)进行分析建树,利用该方法求解系统在多故障状态下的性能可靠性,进行了实例分析。
