Evaluation of the health state and prediction of the remaining life of the track circuit are important for the safe operation of the equipment of railway signal system.Based on support vector data description(SVDD)and...Evaluation of the health state and prediction of the remaining life of the track circuit are important for the safe operation of the equipment of railway signal system.Based on support vector data description(SVDD)and gray prediction,this paper illustrates a method of life prediction for ZPW-2000A track circuit,which combines entropy weight method,SVDD,Mahalanobis distance and negative conversion function to set up a health state assessment model.The model transforms multiple factors affecting the health state into a health index named H to reflect the health state of the equipment.According to H,the life prediction model of ZPW-2000A track circuit equipment is established by means of gray prediction so as to predict the trend of health state of the equipment.The certification of the example shows that the method can visually reflect the health state and effectively predict the remaining life of the equipment.It also provides a theoretical basis to further improve the maintenance and management for ZPW-2000A track circuit.展开更多
The objective of study in the paper was to analyze advantages, disadvantages, opportunities and threats of development of pig healthy agriculture in China, using systematic analysis and SWOT strategic analysis, as wel...The objective of study in the paper was to analyze advantages, disadvantages, opportunities and threats of development of pig healthy agriculture in China, using systematic analysis and SWOT strategic analysis, as well as to show severe diseases, abnormal fluctuation, misplaced way and versatile environment confronted by pig breeding in China. The paper establishes ＂double-hug mode＂, from which pig breeding industry transforms and upgrades to modern breeding industry. Combing with the designed multi-party cooperation mechanism of advantageous regions, urban sale areas and group corporations, it sets up three paths for development of pig healthy agriculture in China, i.e., strategic paths of advantageous regions, urban sale areas and group corporations oriented, with an attempt to provide strategic path reference for transformation and upgrading of pig breeding in China and mode reference for breakthrough of development strategy for pig healthy industry.展开更多
The 7th of April is always appointed to be ”World Health Day” by World Health O rganization (WHO), to celebrate the anniversary of its founding in 1946. World Health Day (WHD) 2004 focuses on road traffic injuries a...The 7th of April is always appointed to be ”World Health Day” by World Health O rganization (WHO), to celebrate the anniversary of its founding in 1946. World Health Day (WHD) 2004 focuses on road traffic injuries and measures to pre vent them, and the slogan for the WHD 2004 is ”Road Safety is No Accident”. 1 W HO calls all people to be concerned with road safety on WHD 2004 and beyond. In fact, almost everybody is related with road traffic, and everybody may be consid ered as a road user. Occurrence of road traffic injury (RTI) It is estimated that in 2002 road crashes killed 1.18 million people and inj ured about 20 to 50 million more. Millions were hospitalized for days, weeks or months. Perhaps 5 million were disabled for life. Every day as many as 140 000 people are injured because of road crashes. More than 3 000 die and about 15 000 are disabled for life. It is predicted that by the year 2020, the an nual number of deaths and disabilities from road traffic injuries will increase by 60% or more, and could take third place in the rank order of disease burden ( DALYs) by the year 2000 as compared with the ninth in 1990. 2展开更多
基金Natural Science Fund of Gansu Province(No.1310RJZA046)
文摘Evaluation of the health state and prediction of the remaining life of the track circuit are important for the safe operation of the equipment of railway signal system.Based on support vector data description(SVDD)and gray prediction,this paper illustrates a method of life prediction for ZPW-2000A track circuit,which combines entropy weight method,SVDD,Mahalanobis distance and negative conversion function to set up a health state assessment model.The model transforms multiple factors affecting the health state into a health index named H to reflect the health state of the equipment.According to H,the life prediction model of ZPW-2000A track circuit equipment is established by means of gray prediction so as to predict the trend of health state of the equipment.The certification of the example shows that the method can visually reflect the health state and effectively predict the remaining life of the equipment.It also provides a theoretical basis to further improve the maintenance and management for ZPW-2000A track circuit.
基金Acknowledgments The authors thank for the support by National Natural Science Foundation of China ＂The Study of Benefits Safeguards of Healthy Pig Breeding Industry and Exemplified Promotion Mechanism＂ （70873125） and by the collaborative project of Scientific Research and Graduate Training of Beijing Municipal Education Commission （Grant 201502911110426）.
文摘The objective of study in the paper was to analyze advantages, disadvantages, opportunities and threats of development of pig healthy agriculture in China, using systematic analysis and SWOT strategic analysis, as well as to show severe diseases, abnormal fluctuation, misplaced way and versatile environment confronted by pig breeding in China. The paper establishes ＂double-hug mode＂, from which pig breeding industry transforms and upgrades to modern breeding industry. Combing with the designed multi-party cooperation mechanism of advantageous regions, urban sale areas and group corporations, it sets up three paths for development of pig healthy agriculture in China, i.e., strategic paths of advantageous regions, urban sale areas and group corporations oriented, with an attempt to provide strategic path reference for transformation and upgrading of pig breeding in China and mode reference for breakthrough of development strategy for pig healthy industry.
文摘The 7th of April is always appointed to be ”World Health Day” by World Health O rganization (WHO), to celebrate the anniversary of its founding in 1946. World Health Day (WHD) 2004 focuses on road traffic injuries and measures to pre vent them, and the slogan for the WHD 2004 is ”Road Safety is No Accident”. 1 W HO calls all people to be concerned with road safety on WHD 2004 and beyond. In fact, almost everybody is related with road traffic, and everybody may be consid ered as a road user. Occurrence of road traffic injury (RTI) It is estimated that in 2002 road crashes killed 1.18 million people and inj ured about 20 to 50 million more. Millions were hospitalized for days, weeks or months. Perhaps 5 million were disabled for life. Every day as many as 140 000 people are injured because of road crashes. More than 3 000 die and about 15 000 are disabled for life. It is predicted that by the year 2020, the an nual number of deaths and disabilities from road traffic injuries will increase by 60% or more, and could take third place in the rank order of disease burden ( DALYs) by the year 2000 as compared with the ninth in 1990. 2
