Recently the phenomenon of disposable schoolbook in China not only has wasted so many resources that produce unfavorable influence, but also has increased unneeessary impact burdens on consumptions of Chinese families...Recently the phenomenon of disposable schoolbook in China not only has wasted so many resources that produce unfavorable influence, but also has increased unneeessary impact burdens on consumptions of Chinese families. The paper analyzes value of the reuse of schoolbooks and main obstacles, introduces the concept of servicizing, discusses the problem of the reuse of schoolbooks from construction of product-service system, and puts forward that realization of the reuse of sChoolbooks depends on innovation of present system and model. Construction of Schoolbook-service system needs shifl from value to consumption habits and behaviors and active participation of every Social class.展开更多
随着量子计算的发展,现有密码系统的安全性将受到严重威胁.Saber算法是抵御量子计算攻击的后量子密码方案之一,但存在多项式商环上模乘占据运算开销过大的问题.鉴此,本文通过对Karatsuba算法和Schoolbook相乘方式的剖析,提出一种面向Sa...随着量子计算的发展,现有密码系统的安全性将受到严重威胁.Saber算法是抵御量子计算攻击的后量子密码方案之一,但存在多项式商环上模乘占据运算开销过大的问题.鉴此,本文通过对Karatsuba算法和Schoolbook相乘方式的剖析,提出一种面向Saber算法的并行乘法器设计方案.该方案首先利用Karatsuba算法分解模乘运算的关键路径,结合乘法复用和加法替换的策略减少硬件开销,然后采用并行运算电路压缩关键运算路径时长,最后在TSMC 65 nm工艺下,利用Modelsim和DC软件仿真验证.结果表明:该方案运算时长为137个时钟周期,与传统方式相比速度提升46.50%,功耗为87.83 m W,面积为927.32×10^(3)μm^(2).展开更多
文摘Recently the phenomenon of disposable schoolbook in China not only has wasted so many resources that produce unfavorable influence, but also has increased unneeessary impact burdens on consumptions of Chinese families. The paper analyzes value of the reuse of schoolbooks and main obstacles, introduces the concept of servicizing, discusses the problem of the reuse of schoolbooks from construction of product-service system, and puts forward that realization of the reuse of sChoolbooks depends on innovation of present system and model. Construction of Schoolbook-service system needs shifl from value to consumption habits and behaviors and active participation of every Social class.
文摘随着量子计算的发展,现有密码系统的安全性将受到严重威胁.Saber算法是抵御量子计算攻击的后量子密码方案之一,但存在多项式商环上模乘占据运算开销过大的问题.鉴此,本文通过对Karatsuba算法和Schoolbook相乘方式的剖析,提出一种面向Saber算法的并行乘法器设计方案.该方案首先利用Karatsuba算法分解模乘运算的关键路径,结合乘法复用和加法替换的策略减少硬件开销,然后采用并行运算电路压缩关键运算路径时长,最后在TSMC 65 nm工艺下,利用Modelsim和DC软件仿真验证.结果表明:该方案运算时长为137个时钟周期,与传统方式相比速度提升46.50%,功耗为87.83 m W,面积为927.32×10^(3)μm^(2).
