无线通信在工业现场中的使用日益广泛,给无线工业控制网络带来了新的安全问题和挑战。面对无线工业控制网络的新形势,文中探讨了无线工业控制网络的安全风险。针对目前无线工控接入认证缺失的脆弱性,在分析无线工业控制网络的层次级安...无线通信在工业现场中的使用日益广泛,给无线工业控制网络带来了新的安全问题和挑战。面对无线工业控制网络的新形势,文中探讨了无线工业控制网络的安全风险。针对目前无线工控接入认证缺失的脆弱性,在分析无线工业控制网络的层次级安全架构的基础上,提出了一种适用于该架构的通信双方安全认证方案,构建基于密钥分配中心(Key Distribution Center,KDC)的无线工业控制网络密钥管理方法,保证无线工业控制网络通信双方的身份安全。展开更多
Pure K2Ti4O9 whiskers were prepared by KDC(Kneading-Drying-Calcination) method with TiO2 and K2CO3 as raw materials. The influences of TiO2/K2CO3 molar ratio(RT/K), calcination temperature(TC) and cooling proces...Pure K2Ti4O9 whiskers were prepared by KDC(Kneading-Drying-Calcination) method with TiO2 and K2CO3 as raw materials. The influences of TiO2/K2CO3 molar ratio(RT/K), calcination temperature(TC) and cooling process on phase composition and morphology of the whiskers were investigated by TG-DSC(thermo gravimetric-differential scanning calorimeter), XRD(X-ray diffraction), and SEM(scanning electron microscope). Pure K2Ti4O9 potassium titanate whiskers with large length-diameter ratio(r)(over 250) can be obtained at RT/K = 2.9 and TC = 950 ℃.展开更多
文摘无线通信在工业现场中的使用日益广泛,给无线工业控制网络带来了新的安全问题和挑战。面对无线工业控制网络的新形势,文中探讨了无线工业控制网络的安全风险。针对目前无线工控接入认证缺失的脆弱性,在分析无线工业控制网络的层次级安全架构的基础上,提出了一种适用于该架构的通信双方安全认证方案,构建基于密钥分配中心(Key Distribution Center,KDC)的无线工业控制网络密钥管理方法,保证无线工业控制网络通信双方的身份安全。
基金Funded by the Natural Science Foundation Key Project of Hubei Province(No.2011CDA060)
文摘Pure K2Ti4O9 whiskers were prepared by KDC(Kneading-Drying-Calcination) method with TiO2 and K2CO3 as raw materials. The influences of TiO2/K2CO3 molar ratio(RT/K), calcination temperature(TC) and cooling process on phase composition and morphology of the whiskers were investigated by TG-DSC(thermo gravimetric-differential scanning calorimeter), XRD(X-ray diffraction), and SEM(scanning electron microscope). Pure K2Ti4O9 potassium titanate whiskers with large length-diameter ratio(r)(over 250) can be obtained at RT/K = 2.9 and TC = 950 ℃.