This paper intends to complete the primary logistics planning of oil products under the imbalance of supply and demand. An integrated mathematical programming model is developed to simultaneously find the balance betw...This paper intends to complete the primary logistics planning of oil products under the imbalance of supply and demand. An integrated mathematical programming model is developed to simultaneously find the balance between supply and demand, and optimize the logistics scheme. The model takes minimum logistics cost and resource adjustment cost as the objective function, and takes supply and demand capacity, transportation capacity, mass balance, and resource adjustment rules as constraints.Three adjustment rules are considered in the model, including resource adjustment within oil suppliers,within oil consumers, and between oil consumers. The model is tested on a large-scale primary logistics of a state-owned petroleum enterprise, involving 37 affiliated refineries, 31 procurement departments,286 market depots and dedicated consumers. After the unified optimization, the supply and demand imbalance is eased by 97% and the total cost is saved by 7%, which proves the effectiveness and applicability of the proposed model.展开更多
Community-based elderly care services play an important role in dealing with popu-lation aging.Based data from the 2018 wave of the Chinese Longitudinal Healthy Longevity Survey,we found that overall there was high de...Community-based elderly care services play an important role in dealing with popu-lation aging.Based data from the 2018 wave of the Chinese Longitudinal Healthy Longevity Survey,we found that overall there was high demand for community-based elderly care services,but insufficient supply,resulting in unmet needs.The greatest demand was for medical care and nursing services and these were gener-ally more accessible compared to other services.The imbalance between available supply and elderly demand was greatest for personal care and psychological con-sulting services.Additionally,there were obvious imbalances of supply and demand for particular groups of the elderly population.In terms of demand,the young-old living in eastern and western China or urban areas had stronger demand for com-munity-based elderly care services.Elderly people with serious disabilities or low income,or living in rural areas and towns had more demand for home visit medical services,while the elderly with the ability to care for themselves or high incomes needed more social and entertainment services.With respect to inadequate supply,the demands for community-based elderly care services of the low-income elderly living in rural areas and towns or in western China were more likely to be unmet.Our results indicated that appropriate services should be provided by government agencies and institutions to meet the needs of various groups.It is also important to increase accessibility to community-based elderly care services as well as to guaran-tee an equitable distribution of supply.展开更多
基金partially supported by the National Natural Science Foundation of China (51874325)the Science Foundation of China University of PetroleumBeijing (2462021BJRC009)。
文摘This paper intends to complete the primary logistics planning of oil products under the imbalance of supply and demand. An integrated mathematical programming model is developed to simultaneously find the balance between supply and demand, and optimize the logistics scheme. The model takes minimum logistics cost and resource adjustment cost as the objective function, and takes supply and demand capacity, transportation capacity, mass balance, and resource adjustment rules as constraints.Three adjustment rules are considered in the model, including resource adjustment within oil suppliers,within oil consumers, and between oil consumers. The model is tested on a large-scale primary logistics of a state-owned petroleum enterprise, involving 37 affiliated refineries, 31 procurement departments,286 market depots and dedicated consumers. After the unified optimization, the supply and demand imbalance is eased by 97% and the total cost is saved by 7%, which proves the effectiveness and applicability of the proposed model.
基金The data analyzed in this paper are from the Chinese Longitudinal Healthy Longevity Study(CLHLS)which was jointly supported by the National Natural Sciences Foundation of China(71490732)the National Key R&D Program of China(2018YFC2000400)the U.S.National Institute of Aging of the National Institute of Health(P01AG031719).
文摘Community-based elderly care services play an important role in dealing with popu-lation aging.Based data from the 2018 wave of the Chinese Longitudinal Healthy Longevity Survey,we found that overall there was high demand for community-based elderly care services,but insufficient supply,resulting in unmet needs.The greatest demand was for medical care and nursing services and these were gener-ally more accessible compared to other services.The imbalance between available supply and elderly demand was greatest for personal care and psychological con-sulting services.Additionally,there were obvious imbalances of supply and demand for particular groups of the elderly population.In terms of demand,the young-old living in eastern and western China or urban areas had stronger demand for com-munity-based elderly care services.Elderly people with serious disabilities or low income,or living in rural areas and towns had more demand for home visit medical services,while the elderly with the ability to care for themselves or high incomes needed more social and entertainment services.With respect to inadequate supply,the demands for community-based elderly care services of the low-income elderly living in rural areas and towns or in western China were more likely to be unmet.Our results indicated that appropriate services should be provided by government agencies and institutions to meet the needs of various groups.It is also important to increase accessibility to community-based elderly care services as well as to guaran-tee an equitable distribution of supply.
