运行状态评价是指在过程正常生产的前提下,进一步判断生产过程运行状态的优劣.针对复杂工业过程定量信息与定性信息共存的情况,本文提出了一种基于随机森林的工业过程运行状态评价方法.针对随机森林中决策树信息存在冗余的问题,基于互...运行状态评价是指在过程正常生产的前提下,进一步判断生产过程运行状态的优劣.针对复杂工业过程定量信息与定性信息共存的情况,本文提出了一种基于随机森林的工业过程运行状态评价方法.针对随机森林中决策树信息存在冗余的问题,基于互信息将传统随机森林中的决策树进行分组,并选出每组中最优的决策树组成新的随机森林.同时为了强化评价精度高的决策树和弱化评价精度低的决策树对最终评价结果的影响,使用加权投票机制取代传统众数投票方法,最终构成一种基于互信息的加权随机森林算法(Mutual information weighted random forest,MIWRF).对于在线评价,本文通过计算在线数据处于各个等级的概率,并且结合提出的在线评价策略,判定当前样本运行状态等级.为了验证所提算法的有效性,将所提方法应用于湿法冶金浸出过程,实验结果表明,相对于传统随机森林算法,MIWRF降低了模型的复杂度,同时提高了运行状态评价精度.展开更多
This paper described the main four basic models of ideal landscape in the Mount Lushan National Park as Kunlunshan model, Xumishan model, Peach flower land model, Christian model. Five typical places in Mount Lushan w...This paper described the main four basic models of ideal landscape in the Mount Lushan National Park as Kunlunshan model, Xumishan model, Peach flower land model, Christian model. Five typical places in Mount Lushan with the ideal landscape characteristics like the East Grove Temple, White Deer Cave Academy, Simplicity and Tranquility Monastery, Lushan Valley, and Villa-cluster of the East Valley were analyzed, and the integration of the basic models for each place was discussed to make the realistic landscape conform to the ideal needs. Moreover, the discussions also involved the characteristics of ideal landscape that are featured in resource, culture, structure, function, process, scale and region. In conclusion, ideal landscape in the Mount Lushan National Park was the product of the interaction between human and nature. Mount Lushan inherits the essence of Chinese traditional culture with a history of more than 1000 years; and it also absorbs the manna of the Western culture as well as the exchanges between nature and humanities together with the conflict and adaptation among different cultures. The natural landscape could be satisfied with the survival demand and cultural taste of mankind by the way of ecological planning.展开更多
Rural tourism in China,has undergone a rapid development in the last three decades.It is an emerging and effective catalyst that promotes industrial restructuring,agricultural development and the upgrading of rural ar...Rural tourism in China,has undergone a rapid development in the last three decades.It is an emerging and effective catalyst that promotes industrial restructuring,agricultural development and the upgrading of rural areas.However,there remains little understanding about the core issues of rural tourism in China:the exact connotation,the principles,the development models and the future directions.This review paper identifies the key issues based on literature analysis,national statistics and press reports to form a general picture of the past,the current and the future prospects of China's rural tourism.The paper firstly addresses the definition,content and principles of rural tourism,and then provides an overview and brief evaluation of the progress and the current development models in China.Finally,based on the analysis of the experiences and problems,the authors sum up with five pathways of the future development of China's rural tourism from the perspective of rural tourism resources,product,market and promotion.展开更多
Low-cost airlines offered cheap fares in exchange eliminating many traditional passenger services.Cheap air transport was considered as an enabling or permissive factor for regional tourism,The most obvious effect was...Low-cost airlines offered cheap fares in exchange eliminating many traditional passenger services.Cheap air transport was considered as an enabling or permissive factor for regional tourism,The most obvious effect was the growth of tourists' amount to a destination and the concomitant changing of visitors market.Additionally,with the development of low-cost airlines,the updated operation means such as on-line booking system enhanced competition ability against traditional sales agent.The selection model of airports,which were gateway for low-cost airlines' entrance to region or tourism destination,would determine the intense relationship between low-cost airlines and tourism.As international low-cost airlines gradually changed their selection from traditional secondary airports and involved into spokehub airports,the operation business model of low-cost airlines diversified as well.Typical international case of low cost airlines in south pacific region was analyzed.Besides,Spring Airlines which was the first low-cost airlines in China was illustrated as well.Further research should focus on a quantitative study on relationship among low-cost airlines,airports distribution and tourism development.展开更多
文摘运行状态评价是指在过程正常生产的前提下,进一步判断生产过程运行状态的优劣.针对复杂工业过程定量信息与定性信息共存的情况,本文提出了一种基于随机森林的工业过程运行状态评价方法.针对随机森林中决策树信息存在冗余的问题,基于互信息将传统随机森林中的决策树进行分组,并选出每组中最优的决策树组成新的随机森林.同时为了强化评价精度高的决策树和弱化评价精度低的决策树对最终评价结果的影响,使用加权投票机制取代传统众数投票方法,最终构成一种基于互信息的加权随机森林算法(Mutual information weighted random forest,MIWRF).对于在线评价,本文通过计算在线数据处于各个等级的概率,并且结合提出的在线评价策略,判定当前样本运行状态等级.为了验证所提算法的有效性,将所提方法应用于湿法冶金浸出过程,实验结果表明,相对于传统随机森林算法,MIWRF降低了模型的复杂度,同时提高了运行状态评价精度.
基金The study was supported by ＂Cities Farming for the Future, RUAF-CFF＂, funded by DGIS of the Netherlands and IDRC of Canada and the National Natural Science Foundation of China （70503007）+1 种基金 the Graduate＇s Scientific Research Foundation of Hunan Province and the Graduate＇s Scientific Research Foundation of Central South University of Forestry and Technology （2006bx03）
文摘This paper described the main four basic models of ideal landscape in the Mount Lushan National Park as Kunlunshan model, Xumishan model, Peach flower land model, Christian model. Five typical places in Mount Lushan with the ideal landscape characteristics like the East Grove Temple, White Deer Cave Academy, Simplicity and Tranquility Monastery, Lushan Valley, and Villa-cluster of the East Valley were analyzed, and the integration of the basic models for each place was discussed to make the realistic landscape conform to the ideal needs. Moreover, the discussions also involved the characteristics of ideal landscape that are featured in resource, culture, structure, function, process, scale and region. In conclusion, ideal landscape in the Mount Lushan National Park was the product of the interaction between human and nature. Mount Lushan inherits the essence of Chinese traditional culture with a history of more than 1000 years; and it also absorbs the manna of the Western culture as well as the exchanges between nature and humanities together with the conflict and adaptation among different cultures. The natural landscape could be satisfied with the survival demand and cultural taste of mankind by the way of ecological planning.
基金supported by a grant from the major projects of the National Social Science Foundation of China (10zd&051)National Natural Science Foundation Item of China(No.41171435 )from the United Nations(UNDP/CPR/040/SPA)
文摘Rural tourism in China,has undergone a rapid development in the last three decades.It is an emerging and effective catalyst that promotes industrial restructuring,agricultural development and the upgrading of rural areas.However,there remains little understanding about the core issues of rural tourism in China:the exact connotation,the principles,the development models and the future directions.This review paper identifies the key issues based on literature analysis,national statistics and press reports to form a general picture of the past,the current and the future prospects of China's rural tourism.The paper firstly addresses the definition,content and principles of rural tourism,and then provides an overview and brief evaluation of the progress and the current development models in China.Finally,based on the analysis of the experiences and problems,the authors sum up with five pathways of the future development of China's rural tourism from the perspective of rural tourism resources,product,market and promotion.
文摘Low-cost airlines offered cheap fares in exchange eliminating many traditional passenger services.Cheap air transport was considered as an enabling or permissive factor for regional tourism,The most obvious effect was the growth of tourists' amount to a destination and the concomitant changing of visitors market.Additionally,with the development of low-cost airlines,the updated operation means such as on-line booking system enhanced competition ability against traditional sales agent.The selection model of airports,which were gateway for low-cost airlines' entrance to region or tourism destination,would determine the intense relationship between low-cost airlines and tourism.As international low-cost airlines gradually changed their selection from traditional secondary airports and involved into spokehub airports,the operation business model of low-cost airlines diversified as well.Typical international case of low cost airlines in south pacific region was analyzed.Besides,Spring Airlines which was the first low-cost airlines in China was illustrated as well.Further research should focus on a quantitative study on relationship among low-cost airlines,airports distribution and tourism development.
