Due to the fact that the register files seriously affectthe performance and area of coarse-gained reconfigurablecryptographic processors, an efficient structure of thedistributed cross-domain register file is proposed...Due to the fact that the register files seriously affectthe performance and area of coarse-gained reconfigurablecryptographic processors, an efficient structure of thedistributed cross-domain register file is proposed to realize acryptographic processor with a high performance and a lowarea cost. In order to meet the demands of high performanceand high flexibility at a low area cost, a union structure withthe multi-ports access structure, i, e., a distributed cross-domain register file, is designed by analyzing the algorithmfeatures of different ciphers. Considering different algorithmrequirements of the global register files and local register files,the circuit design is realized by adopting different designparameters under TSMC （ Taiwan SemiconductorManufacturing Company） 40 nm CMOS（complementary metaloxide semiconductor） technology and compared with othersimilar works. The experimental results show that theproposed distributed cross-domain register structure caneffectively improve the performance of the unit area, of whichthe total performance of block per cycle is improved by17.79% and performance of block per cycle per area isimproved bv 117 %.展开更多
客观世界存在时空场,大部分地理实体或现象在时空域具有动态变化特性,其空间、时间和属性是过程的统一体,传统的GIS时空数据模型在描述、表达、组织与分析这类数据时面临许多挑战。然而,基于特征的数据模型和以过程为对象的时空数据组...客观世界存在时空场,大部分地理实体或现象在时空域具有动态变化特性,其空间、时间和属性是过程的统一体,传统的GIS时空数据模型在描述、表达、组织与分析这类数据时面临许多挑战。然而,基于特征的数据模型和以过程为对象的时空数据组织在动态数据的描述与表达的方面具有独特的优势。本文探讨了基于特征的线过程时空数据模型组织的六元组框架体系,实现空间、时间和属性的一体化存储和地理实体的动态分析。在分析线时空过程特性的基础上,归纳总结出3大类12个类别的线过程,进一步提出了基于特征的线过程时空数据模型(Feature-based Line Process Spatio-temporal Data Model)的概念;利用文件层次分块结构对时空线过程数据进行了组织与存储。最后以海洋锋为实例,探讨了该模型在时空数据组织、时空查询、时空过程提取和时空过程可视化等方面的应用。结果表明,该模型能够很好地应用于具有时空过程特性的线数据中,也为时空数据模型的总体设计提供借鉴。展开更多
基金The National Natural Science Foundation of China(No.61176024)
文摘Due to the fact that the register files seriously affectthe performance and area of coarse-gained reconfigurablecryptographic processors, an efficient structure of thedistributed cross-domain register file is proposed to realize acryptographic processor with a high performance and a lowarea cost. In order to meet the demands of high performanceand high flexibility at a low area cost, a union structure withthe multi-ports access structure, i, e., a distributed cross-domain register file, is designed by analyzing the algorithmfeatures of different ciphers. Considering different algorithmrequirements of the global register files and local register files,the circuit design is realized by adopting different designparameters under TSMC （ Taiwan SemiconductorManufacturing Company） 40 nm CMOS（complementary metaloxide semiconductor） technology and compared with othersimilar works. The experimental results show that theproposed distributed cross-domain register structure caneffectively improve the performance of the unit area, of whichthe total performance of block per cycle is improved by17.79% and performance of block per cycle per area isimproved bv 117 %.
文摘在详细介绍美国JPL(Jet Propulsion Laboratory,喷气推进实验室)发布的DE(Development Ephemerides,行星/月球展开历表)系列历表的基本情况、头文件和数据文件的结构、历表计算原理等内容的基础上,以DE405、DE421、DE431为例,分别计算了1900—2200年间月球、太阳、行星等天体在地心天球参考系中的坐标及速度,并由此得到3个历表间的差异,结果表明DE431与DE421之间的差异,整体而言要小于二者同DE405之间的差异。最后以引潮力的计算为例,表明历表更新对于引潮力的影响基本可忽略不计,验证了IERS(International Earth Rotation and reference systems Service,国际地球自转与参考系服务)规范中关于历表更新对相关地球科学影响十分有限的结论。
文摘客观世界存在时空场,大部分地理实体或现象在时空域具有动态变化特性,其空间、时间和属性是过程的统一体,传统的GIS时空数据模型在描述、表达、组织与分析这类数据时面临许多挑战。然而,基于特征的数据模型和以过程为对象的时空数据组织在动态数据的描述与表达的方面具有独特的优势。本文探讨了基于特征的线过程时空数据模型组织的六元组框架体系,实现空间、时间和属性的一体化存储和地理实体的动态分析。在分析线时空过程特性的基础上,归纳总结出3大类12个类别的线过程,进一步提出了基于特征的线过程时空数据模型(Feature-based Line Process Spatio-temporal Data Model)的概念;利用文件层次分块结构对时空线过程数据进行了组织与存储。最后以海洋锋为实例,探讨了该模型在时空数据组织、时空查询、时空过程提取和时空过程可视化等方面的应用。结果表明,该模型能够很好地应用于具有时空过程特性的线数据中,也为时空数据模型的总体设计提供借鉴。
