Conventional feature description methods have large errors in froth features due to the fact that the image during the zinc flotation process of froth flotation is dynamic,and the existing image features rarely have t...Conventional feature description methods have large errors in froth features due to the fact that the image during the zinc flotation process of froth flotation is dynamic,and the existing image features rarely have time series information.Based on the conventional froth size distribution characteristics,this paper proposes a size trend core feature(STCF)considering the froth size distribution,i.e.,a feature centered on the time series of the froth size distribution.The core features of the trend are extracted,the inter-frame change factor and the inter-frame stability factor are given and two calculation methods of the feature factors are proposed.Meanwhile,the STCF feature algorithm was established based on the core features by adding the inter-frame change factor and the inter-frame stability factor.Finally,a flotation condition recognition model based on BP neural network was established.The experiments show that the recognition model has achieved excellent results,proving that the method proposed effectively overcomes the limitation of the lack of dynamic information in the existing traditional size distribution features and the introduction of the two factors can improve the classification accuracy to varying degrees.展开更多
The European Working Conditions(the EWCS)Series Eurofound,the European Foundation for the improvement of working and living conditions is a European tripartite agency which contributes to the improvement of working an...The European Working Conditions(the EWCS)Series Eurofound,the European Foundation for the improvement of working and living conditions is a European tripartite agency which contributes to the improvement of working and living conditions.A key instrument to do so is the EWCS.The EWCS aims to comparably measure working conditions across European countries and beyond.This allows for the analysis of relationships between different aspects of working conditions,the identification of groups at risk and issues of concern,as well as areas of progress and the monitoring of trends over time.These analyses contribute to European policy development,in particular on issues with regard to the quality of work and employment.Following earlier editions of the EWCS in1991,1995,2000,2005 and 2010,a sixth wave of the survey will be fielded in 2015.Eurofound develops the questionnaire and outlines the design of the survey as well as a strict quality assurance framework.The actual preparation and implementation of fieldwork is contracted out.The development of the questionnaire is user led.Tripartite users of the survey are key in setting priorities for change.The questionnaire of the 6th EWCS maintain many trend questions which allow mapping changes over time.Yet a number of new questions will be included in the 6th editions which cover recent changes in work,sustainability of work,boundaryless work,work life balance,organisational justice,engagement,sleeping problems,chronic diseases,blurring frontiers in employment status.Changes over time On average there are little changes:this is because work situations and working conditions are becoming more diverse and inequalities in working conditions are increasing.On average,workers work less and less workers work long hours.They also work less"atypical"working hours.Work is taking place in more collective environment(clients,devolution of coordination tasks down to employee level etc.).Yet employment relations are more individualised.Technology use is on the increase but level of reported cognitive demands has remained the same.Exposure to physical risks remains high.Exposure to psychosocial risks is probably on the increase as illustrated by work intensification.Employment status in evolution:frontiers between categories less strict:the employment contract plays a key role in framing working conditions.Over time,there has been slow progress in gender segregation.Women still bear much of the burden of care activities.Sustainable work on the increase:good working conditions are key for sustainability as well as the provision of meaningful work.Less people report a good/very good work life balance.Important differences are lost at the aggregate level.Unfavourable working conditions tend to cluster disproportionally in some groups.Policy conclusions The improvement of working conditions is not automatic and need to be supported.Lifecourse perspective is important to understand trade-offs between job quality features.Social and economic policies are linked together:good work and good working conditions are key in facilitating good performance and wellbeing.Actions to support the improvement of working conditions are not necessarily costly.Many actors contribute to the improvement of working conditions and their efforts need to be supported.展开更多
基金Project(U1701261)supported by the National Science Foundation of China,Guangdong Joint Fund of Key ProjectsProject(61771492)supported by the National Natural Science Foundation of ChinaProject(2018GK4016)supported by Hunan Province Strategic Emerging Industry Science and Technology Research and Major Science and Technology Achievement Transformation Project,China。
文摘Conventional feature description methods have large errors in froth features due to the fact that the image during the zinc flotation process of froth flotation is dynamic,and the existing image features rarely have time series information.Based on the conventional froth size distribution characteristics,this paper proposes a size trend core feature(STCF)considering the froth size distribution,i.e.,a feature centered on the time series of the froth size distribution.The core features of the trend are extracted,the inter-frame change factor and the inter-frame stability factor are given and two calculation methods of the feature factors are proposed.Meanwhile,the STCF feature algorithm was established based on the core features by adding the inter-frame change factor and the inter-frame stability factor.Finally,a flotation condition recognition model based on BP neural network was established.The experiments show that the recognition model has achieved excellent results,proving that the method proposed effectively overcomes the limitation of the lack of dynamic information in the existing traditional size distribution features and the introduction of the two factors can improve the classification accuracy to varying degrees.
文摘The European Working Conditions(the EWCS)Series Eurofound,the European Foundation for the improvement of working and living conditions is a European tripartite agency which contributes to the improvement of working and living conditions.A key instrument to do so is the EWCS.The EWCS aims to comparably measure working conditions across European countries and beyond.This allows for the analysis of relationships between different aspects of working conditions,the identification of groups at risk and issues of concern,as well as areas of progress and the monitoring of trends over time.These analyses contribute to European policy development,in particular on issues with regard to the quality of work and employment.Following earlier editions of the EWCS in1991,1995,2000,2005 and 2010,a sixth wave of the survey will be fielded in 2015.Eurofound develops the questionnaire and outlines the design of the survey as well as a strict quality assurance framework.The actual preparation and implementation of fieldwork is contracted out.The development of the questionnaire is user led.Tripartite users of the survey are key in setting priorities for change.The questionnaire of the 6th EWCS maintain many trend questions which allow mapping changes over time.Yet a number of new questions will be included in the 6th editions which cover recent changes in work,sustainability of work,boundaryless work,work life balance,organisational justice,engagement,sleeping problems,chronic diseases,blurring frontiers in employment status.Changes over time On average there are little changes:this is because work situations and working conditions are becoming more diverse and inequalities in working conditions are increasing.On average,workers work less and less workers work long hours.They also work less"atypical"working hours.Work is taking place in more collective environment(clients,devolution of coordination tasks down to employee level etc.).Yet employment relations are more individualised.Technology use is on the increase but level of reported cognitive demands has remained the same.Exposure to physical risks remains high.Exposure to psychosocial risks is probably on the increase as illustrated by work intensification.Employment status in evolution:frontiers between categories less strict:the employment contract plays a key role in framing working conditions.Over time,there has been slow progress in gender segregation.Women still bear much of the burden of care activities.Sustainable work on the increase:good working conditions are key for sustainability as well as the provision of meaningful work.Less people report a good/very good work life balance.Important differences are lost at the aggregate level.Unfavourable working conditions tend to cluster disproportionally in some groups.Policy conclusions The improvement of working conditions is not automatic and need to be supported.Lifecourse perspective is important to understand trade-offs between job quality features.Social and economic policies are linked together:good work and good working conditions are key in facilitating good performance and wellbeing.Actions to support the improvement of working conditions are not necessarily costly.Many actors contribute to the improvement of working conditions and their efforts need to be supported.
