Security during remote transmission has been an important concern for researchers in recent years.In this paper,a hierarchical encryption multi-image encryption scheme for people with different security levels is desi...Security during remote transmission has been an important concern for researchers in recent years.In this paper,a hierarchical encryption multi-image encryption scheme for people with different security levels is designed,and a multiimage encryption(MIE)algorithm with row and column confusion and closed-loop bi-directional diffusion is adopted in the paper.While ensuring secure communication of medical image information,people with different security levels have different levels of decryption keys,and differentiated visual effects can be obtained by using the strong sensitivity of chaotic keys.The highest security level can obtain decrypted images without watermarks,and at the same time,patient information and copyright attribution can be verified by obtaining watermark images.The experimental results show that the scheme is sufficiently secure as an MIE scheme with visualized differences and the encryption and decryption efficiency is significantly improved compared to other works.展开更多
已有研究关于新型农村合作医疗对农户商业医疗保险的影响是挤出效应还是促进效应存在争论。基于中国健康和营养调查(China Health and Nutrition Survey,CHNS)2004年～2009年的数据,运用双重差分(DID)方法和probit模型实证考察了农户商...已有研究关于新型农村合作医疗对农户商业医疗保险的影响是挤出效应还是促进效应存在争论。基于中国健康和营养调查(China Health and Nutrition Survey,CHNS)2004年～2009年的数据,运用双重差分(DID)方法和probit模型实证考察了农户商业医疗保险购买的影响因素以及新农合的快速推广对商业医疗保险需求的影响。实证结果发现,新农合与商业医疗保险之间先是替代关系,而后转为互补关系;并且年龄、是否患有慢性病、家庭规模和家庭收入对于商业医疗保险的需求均有着显著的负向影响,实证证据支持农户在商业医疗保险的购买中存在一定程度的逆向选择。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.62061014)the Natural Science Foundation of Liaoning province of China(Grant No.2020-MS-274).
文摘Security during remote transmission has been an important concern for researchers in recent years.In this paper,a hierarchical encryption multi-image encryption scheme for people with different security levels is designed,and a multiimage encryption(MIE)algorithm with row and column confusion and closed-loop bi-directional diffusion is adopted in the paper.While ensuring secure communication of medical image information,people with different security levels have different levels of decryption keys,and differentiated visual effects can be obtained by using the strong sensitivity of chaotic keys.The highest security level can obtain decrypted images without watermarks,and at the same time,patient information and copyright attribution can be verified by obtaining watermark images.The experimental results show that the scheme is sufficiently secure as an MIE scheme with visualized differences and the encryption and decryption efficiency is significantly improved compared to other works.
文摘已有研究关于新型农村合作医疗对农户商业医疗保险的影响是挤出效应还是促进效应存在争论。基于中国健康和营养调查(China Health and Nutrition Survey,CHNS)2004年～2009年的数据,运用双重差分(DID)方法和probit模型实证考察了农户商业医疗保险购买的影响因素以及新农合的快速推广对商业医疗保险需求的影响。实证结果发现,新农合与商业医疗保险之间先是替代关系,而后转为互补关系;并且年龄、是否患有慢性病、家庭规模和家庭收入对于商业医疗保险的需求均有着显著的负向影响,实证证据支持农户在商业医疗保险的购买中存在一定程度的逆向选择。
