A Receiver Operating Characteristic(ROC)analysis of a power is important and useful in clinical trials.A Classical Conditional Power(CCP)is a probability of a classical rejection region given values of true treatment ...A Receiver Operating Characteristic(ROC)analysis of a power is important and useful in clinical trials.A Classical Conditional Power(CCP)is a probability of a classical rejection region given values of true treatment effect and interim result.For hypotheses and reversed hypotheses under normal models,we obtain analytical expressions of the ROC curves of the CCP,find optimal ROC curves of the CCP,investigate the superiority of the ROC curves of the CCP,calculate critical values of the False Positive Rate(FPR),True Positive Rate(TPR),and cutoff of the optimal CCP,and give go/no go decisions at the interim of the optimal CCP.In addition,extensive numerical experiments are carried out to exemplify our theoretical results.Finally,a real data example is performed to illustrate the go/no go decisions of the optimal CCP.展开更多
Mining machineries are generally exposed to intensive vibrations in harsh mining environment. If vibrations are beyond the tolerable limit, the machine and its operator health will be under the risk. In this work, the...Mining machineries are generally exposed to intensive vibrations in harsh mining environment. If vibrations are beyond the tolerable limit, the machine and its operator health will be under the risk. In this work, the vibration of a mining truck at different operational conditions are simulated and discussed. To achieve this aim, three haul roads with low, medium and poor qualities are considered based on the ISO standard. Accordingly, the vibration of a mining truck in different speeds, payload and distribution qualities of materials in the dump body are evaluated in each haul road quality using Trucksim software. The simulation results with statistical discussions indicate that the truck speed and the materials distribution quality have significant effects on the root mean square(RMS) of vertical vibrations. However, the effect of the payload is not considerable on the RMS. Moreover, the accumulation of materials on the rear side of the truck dump body is efficient on the vibrational health risk.展开更多
随着我国能源结构转型持续演进,能源革命持续深化,综合能源服务成为实现能效提升和绿色发展的有效途径,而智慧运维服务则是落实综合能源服务理念,达到安全、智慧、高效用能的重要实现手段。分析综合能源系统智慧运维(Intelligent operat...随着我国能源结构转型持续演进,能源革命持续深化,综合能源服务成为实现能效提升和绿色发展的有效途径,而智慧运维服务则是落实综合能源服务理念,达到安全、智慧、高效用能的重要实现手段。分析综合能源系统智慧运维(Intelligent operation and maintenance of integrated energy system,IES-IOM)的特点,从人工运维、自动化运维和智慧运维三个阶段阐述了其发展历程;基于IES-IOM的数据情况,提出智慧运维关键核心技术;构建IES-IOM服务业务体系,包括运维知识库建立、设备状态评估、设备状态预测、设备故障诊断和运维策略推荐;围绕商业楼宇、工业园区两大典型综合能源系统应用场景,分析智慧运维服务业务的应用效果。最后,提出IES-IOM面临的挑战,并展望未来发展方向,以期对深入理解和推动IES-IOM的发展提供理论支撑。展开更多
基金supported by the National Social Science Fund of China(Grand No.21XTJ001).
文摘A Receiver Operating Characteristic(ROC)analysis of a power is important and useful in clinical trials.A Classical Conditional Power(CCP)is a probability of a classical rejection region given values of true treatment effect and interim result.For hypotheses and reversed hypotheses under normal models,we obtain analytical expressions of the ROC curves of the CCP,find optimal ROC curves of the CCP,investigate the superiority of the ROC curves of the CCP,calculate critical values of the False Positive Rate(FPR),True Positive Rate(TPR),and cutoff of the optimal CCP,and give go/no go decisions at the interim of the optimal CCP.In addition,extensive numerical experiments are carried out to exemplify our theoretical results.Finally,a real data example is performed to illustrate the go/no go decisions of the optimal CCP.
文摘Mining machineries are generally exposed to intensive vibrations in harsh mining environment. If vibrations are beyond the tolerable limit, the machine and its operator health will be under the risk. In this work, the vibration of a mining truck at different operational conditions are simulated and discussed. To achieve this aim, three haul roads with low, medium and poor qualities are considered based on the ISO standard. Accordingly, the vibration of a mining truck in different speeds, payload and distribution qualities of materials in the dump body are evaluated in each haul road quality using Trucksim software. The simulation results with statistical discussions indicate that the truck speed and the materials distribution quality have significant effects on the root mean square(RMS) of vertical vibrations. However, the effect of the payload is not considerable on the RMS. Moreover, the accumulation of materials on the rear side of the truck dump body is efficient on the vibrational health risk.
文摘随着我国能源结构转型持续演进,能源革命持续深化,综合能源服务成为实现能效提升和绿色发展的有效途径,而智慧运维服务则是落实综合能源服务理念,达到安全、智慧、高效用能的重要实现手段。分析综合能源系统智慧运维(Intelligent operation and maintenance of integrated energy system,IES-IOM)的特点,从人工运维、自动化运维和智慧运维三个阶段阐述了其发展历程;基于IES-IOM的数据情况,提出智慧运维关键核心技术;构建IES-IOM服务业务体系,包括运维知识库建立、设备状态评估、设备状态预测、设备故障诊断和运维策略推荐;围绕商业楼宇、工业园区两大典型综合能源系统应用场景,分析智慧运维服务业务的应用效果。最后,提出IES-IOM面临的挑战,并展望未来发展方向,以期对深入理解和推动IES-IOM的发展提供理论支撑。
