Since health monitoring of shield tunnels generally employs multiple sensors belonging to different types,a fine analysis on massive monitoring data,as well as further quantitative health grading,is really challenging...Since health monitoring of shield tunnels generally employs multiple sensors belonging to different types,a fine analysis on massive monitoring data,as well as further quantitative health grading,is really challenging.An optimized fuzzy clustering analysis method based on the fuzzy equivalence relation is proposed for health monitoring of shield tunnels.Clustering results are auto-generated by using fuzzy similarity-valued map.The results follow the idea of unsupervised classification.Moreover,a convenient new health index HI is proposed for a fast tunnel-health grading.A case study on Nanjing Yangtze River Tunnel is presented to validate this method.Three types of indicators,namely soil pressure,pore water pressure and steel strain,are used to develop the clustering model.The clustering results are verified by analyzing the engineering geological conditions;the validity and the efficacy of the proposed method are also demonstrated.Further,the fuzzy clustering analysis also represents a potential for identifying abnormal monitoring data.This investigation indicates the fuzzy clustering analysis method is capable of characterizing the fuzziness of tunnel health,and beneficial to clarify the tunnel health evaluation uncertainties.展开更多
In this paper we studied a key control project in QinghaiTibet Railway construction. The project included the oxygen supplying system, the ventilation and air changing system measure of tunnel environment, monitorin...In this paper we studied a key control project in QinghaiTibet Railway construction. The project included the oxygen supplying system, the ventilation and air changing system measure of tunnel environment, monitoring and comprehensive treatment on airborne dust and toxic and harmful gases, hygiene intervention with builders in Fenghuoshan Tunnel construction. In the worst sector of the whole Qinghai-Tibet Railway line, we acquired a good achievement of the lowest incidence rate of altitude disease. Hence the Fenghuoshan Tunnel was joined up in advance, which set up a new record for frozen soil tunnel construction at high altitudes. The application of health care measure for tunnel construction promised rapid results.展开更多
This service evaluation and pilot study was designed to establish whether a clinical questionnaire could be incorporated within our Secondary Care Carpal Tunnel Service. The purpose of the questionnaire is to predict ...This service evaluation and pilot study was designed to establish whether a clinical questionnaire could be incorporated within our Secondary Care Carpal Tunnel Service. The purpose of the questionnaire is to predict the positive and negative results of Nerve Conduction Studies (NCS) in those patients with suspected Carpal Tunnel Syndrome. The hand specialist, preceding NCS administered the questionnaire;it was then scored at a later date. Results showed a sensitivity of 86% and specificity of 84% referring to the ability to predict a positive NCS when using a predetermined cut-off score. When analysed with Receiver Operating Characteristics, a threshold score could be determined in order to obtain 100% sensitivity/specificity. This questionnaire can be used as a useful adjunct to assessment of those presenting with suspected Carpal Tunnel Syndrome. Using the questionnaire to identify those patients scoring outside a predetermined threshold range would reduce the need for NCS by nearly 50%, with significant cost and clinical practice implications.展开更多
煤矿坑道钻机自动化和智能化程度的提高、作业范围和应用场景的扩展,使其系统复杂性和工作环境恶劣程度随之增加,对煤矿坑道钻机可靠性提出新的挑战。为有效降低因钻机故障带来的安全风险,提升钻机全寿命周期的任务品质,煤矿坑道钻机状...煤矿坑道钻机自动化和智能化程度的提高、作业范围和应用场景的扩展,使其系统复杂性和工作环境恶劣程度随之增加,对煤矿坑道钻机可靠性提出新的挑战。为有效降低因钻机故障带来的安全风险,提升钻机全寿命周期的任务品质,煤矿坑道钻机状态监测与故障诊断技术应运而生。首先从钻机状态参数采集、数据处理、诊断方法、系统应用等四个方面对煤矿坑道钻机关键系统状态监测和故障诊断技术研究现状进行总结分析,然后在故障预测与健康管理(prognostics and health management, PHM)技术基本概念的基础上根据集中式与分布式结合的方式提出了坑道钻机PHM技术框架,最后对煤矿坑道钻机PHM技术发展趋势进行展望,旨在为新一代煤矿坑道钻机及相关煤矿机械装备PHM技术的研究开展提供参考和借鉴。展开更多
基金supported by the National Natural Science Foundation of China (No.40902076)the Science Foundation of Jiangsu Province(No.BK20141224)
文摘Since health monitoring of shield tunnels generally employs multiple sensors belonging to different types,a fine analysis on massive monitoring data,as well as further quantitative health grading,is really challenging.An optimized fuzzy clustering analysis method based on the fuzzy equivalence relation is proposed for health monitoring of shield tunnels.Clustering results are auto-generated by using fuzzy similarity-valued map.The results follow the idea of unsupervised classification.Moreover,a convenient new health index HI is proposed for a fast tunnel-health grading.A case study on Nanjing Yangtze River Tunnel is presented to validate this method.Three types of indicators,namely soil pressure,pore water pressure and steel strain,are used to develop the clustering model.The clustering results are verified by analyzing the engineering geological conditions;the validity and the efficacy of the proposed method are also demonstrated.Further,the fuzzy clustering analysis also represents a potential for identifying abnormal monitoring data.This investigation indicates the fuzzy clustering analysis method is capable of characterizing the fuzziness of tunnel health,and beneficial to clarify the tunnel health evaluation uncertainties.
文摘In this paper we studied a key control project in QinghaiTibet Railway construction. The project included the oxygen supplying system, the ventilation and air changing system measure of tunnel environment, monitoring and comprehensive treatment on airborne dust and toxic and harmful gases, hygiene intervention with builders in Fenghuoshan Tunnel construction. In the worst sector of the whole Qinghai-Tibet Railway line, we acquired a good achievement of the lowest incidence rate of altitude disease. Hence the Fenghuoshan Tunnel was joined up in advance, which set up a new record for frozen soil tunnel construction at high altitudes. The application of health care measure for tunnel construction promised rapid results.
文摘This service evaluation and pilot study was designed to establish whether a clinical questionnaire could be incorporated within our Secondary Care Carpal Tunnel Service. The purpose of the questionnaire is to predict the positive and negative results of Nerve Conduction Studies (NCS) in those patients with suspected Carpal Tunnel Syndrome. The hand specialist, preceding NCS administered the questionnaire;it was then scored at a later date. Results showed a sensitivity of 86% and specificity of 84% referring to the ability to predict a positive NCS when using a predetermined cut-off score. When analysed with Receiver Operating Characteristics, a threshold score could be determined in order to obtain 100% sensitivity/specificity. This questionnaire can be used as a useful adjunct to assessment of those presenting with suspected Carpal Tunnel Syndrome. Using the questionnaire to identify those patients scoring outside a predetermined threshold range would reduce the need for NCS by nearly 50%, with significant cost and clinical practice implications.
文摘煤矿坑道钻机自动化和智能化程度的提高、作业范围和应用场景的扩展,使其系统复杂性和工作环境恶劣程度随之增加,对煤矿坑道钻机可靠性提出新的挑战。为有效降低因钻机故障带来的安全风险,提升钻机全寿命周期的任务品质,煤矿坑道钻机状态监测与故障诊断技术应运而生。首先从钻机状态参数采集、数据处理、诊断方法、系统应用等四个方面对煤矿坑道钻机关键系统状态监测和故障诊断技术研究现状进行总结分析,然后在故障预测与健康管理(prognostics and health management, PHM)技术基本概念的基础上根据集中式与分布式结合的方式提出了坑道钻机PHM技术框架,最后对煤矿坑道钻机PHM技术发展趋势进行展望,旨在为新一代煤矿坑道钻机及相关煤矿机械装备PHM技术的研究开展提供参考和借鉴。
