随着万物互联和大数据时代的到来,通过线下交互数据追踪传染病患者的密切接触者,利用健康数据对密切接触者的健康状态进行持续监测,为传染病人际传播分析带来了新的研究视角,为阻断传染病的传播提供了新的处理方式。然而,此类方法也存...随着万物互联和大数据时代的到来,通过线下交互数据追踪传染病患者的密切接触者,利用健康数据对密切接触者的健康状态进行持续监测,为传染病人际传播分析带来了新的研究视角,为阻断传染病的传播提供了新的处理方式。然而,此类方法也存在较为严重的隐私泄露问题。为此,文章设计了基于线下交互和健康数据的传染病人际传播分析模型(Analysis Model of Human-to-Human Transmission of Infectious Diseases Based on Offline Interaction and Health Data,AMHHTID-OIHD)。该模型由可信机构、健康云服务器、交互云服务器、疾控中心、医院和用户6种实体组成,在支持隐私保护的同时实现CDC查找该患者的密切接触者并对其进行健康状态分类。文章以KNN分类和高斯朴素贝叶斯分类为基础,结合同态加密技术,设计了支持AMHHTID-OIHD的隐私保护密切接触者查找算法和隐私保护健康状态分类算法。最后,对该模型的安全性进行分析,结果表明该模型可以在保护隐私的情况下实现密切接触者查找和健康状态分类。展开更多
A Fe_(2)O_(3)-MWNTs(multi-walled carbon nanotubes)composite with a reinforced concrete structure was fabricated employing a two-step method which involves a sol-gel process followed by high-temperature in situ sinteri...A Fe_(2)O_(3)-MWNTs(multi-walled carbon nanotubes)composite with a reinforced concrete structure was fabricated employing a two-step method which involves a sol-gel process followed by high-temperature in situ sintering.This Fe_(2)O_(3)-MWNTs composite,intended to be used as an anode material for lithium-ion batteries,maintained a reversible capacity as high as 896.3 mA·h/g after 100 cycles at a current density of 100 mA/g and the initial coulombic efficiency reached 75.5%.The rate capabilities of the Fe_(2)O_(3)-MWNTs composite,evaluated using the ratios of capacity at 100,200,500,1000,2000 and 100 mA/g after every 10 cycles,were determined to be 904.7,852.1,759.0,653.8,566.8 and 866.3 mA·h/g,respectively.Such a superior electrochemical performance of the Fe_(2)O_(3)-MWNTs composite is mainly attributed to the reinforced concrete construction,in which the MWNTs function as the skeleton and conductive network.Such a structure contributes to shortening the transport pathways for both Li+and electrons,enhancing conductivity and accommodating volume expansion during prolonged cycling.This Fe_(2)O_(3)-MWNTs composite with the designed structure is a promising anode material for high-performance lithium-ion batteries.展开更多
文摘随着万物互联和大数据时代的到来,通过线下交互数据追踪传染病患者的密切接触者,利用健康数据对密切接触者的健康状态进行持续监测,为传染病人际传播分析带来了新的研究视角,为阻断传染病的传播提供了新的处理方式。然而,此类方法也存在较为严重的隐私泄露问题。为此,文章设计了基于线下交互和健康数据的传染病人际传播分析模型(Analysis Model of Human-to-Human Transmission of Infectious Diseases Based on Offline Interaction and Health Data,AMHHTID-OIHD)。该模型由可信机构、健康云服务器、交互云服务器、疾控中心、医院和用户6种实体组成,在支持隐私保护的同时实现CDC查找该患者的密切接触者并对其进行健康状态分类。文章以KNN分类和高斯朴素贝叶斯分类为基础,结合同态加密技术,设计了支持AMHHTID-OIHD的隐私保护密切接触者查找算法和隐私保护健康状态分类算法。最后,对该模型的安全性进行分析,结果表明该模型可以在保护隐私的情况下实现密切接触者查找和健康状态分类。
基金National Natural Science Foundation of China(Nos.21471100,21704066)Guangdong Basic and Applied Basic Research Foundation,China(No.2021A1515010241)Shenzhen Natural Science Fund,China(the Stable Support Plan Program)(No.20200813081943001).
文摘A Fe_(2)O_(3)-MWNTs(multi-walled carbon nanotubes)composite with a reinforced concrete structure was fabricated employing a two-step method which involves a sol-gel process followed by high-temperature in situ sintering.This Fe_(2)O_(3)-MWNTs composite,intended to be used as an anode material for lithium-ion batteries,maintained a reversible capacity as high as 896.3 mA·h/g after 100 cycles at a current density of 100 mA/g and the initial coulombic efficiency reached 75.5%.The rate capabilities of the Fe_(2)O_(3)-MWNTs composite,evaluated using the ratios of capacity at 100,200,500,1000,2000 and 100 mA/g after every 10 cycles,were determined to be 904.7,852.1,759.0,653.8,566.8 and 866.3 mA·h/g,respectively.Such a superior electrochemical performance of the Fe_(2)O_(3)-MWNTs composite is mainly attributed to the reinforced concrete construction,in which the MWNTs function as the skeleton and conductive network.Such a structure contributes to shortening the transport pathways for both Li+and electrons,enhancing conductivity and accommodating volume expansion during prolonged cycling.This Fe_(2)O_(3)-MWNTs composite with the designed structure is a promising anode material for high-performance lithium-ion batteries.
