数字版权管理(Digital Rights Management,DRM)保护对数字内容的合法使用,限制非法访问。DRM的权利描述及执行机制是DRM系统的核心。本文通过对各种权利描述机制的分类研究,分析比较了它们的特点及适用范围;最后根据分析研究的结果提出...数字版权管理(Digital Rights Management,DRM)保护对数字内容的合法使用,限制非法访问。DRM的权利描述及执行机制是DRM系统的核心。本文通过对各种权利描述机制的分类研究,分析比较了它们的特点及适用范围;最后根据分析研究的结果提出了构建广播电视数字版权管理系统权利描述机制的想法和建议。展开更多
Based on the thermodynamics theory and physical micro-properties of solid materials subjected to external loading at room temperature,a formula of calculating temperature difference of infrared radiation in terms of t...Based on the thermodynamics theory and physical micro-properties of solid materials subjected to external loading at room temperature,a formula of calculating temperature difference of infrared radiation in terms of the sum of three principal strains was deduced to quantitatively investigate the infrared radiation characteristics in test. Two typical specimens,the three-point bending beam and the disc pressed in diameter,were tested and their principal strains were calculated by finite element method in order to obtain the temperature differences of infrared radiation. Numerical results are in a good agreement with test results,which verifies the validity of the formula of calculating temperature differences of infrared radiation and the model of quantitatively describing the infrared radiation characteristics of solid materials,and reveals the corresponding inner physical mechanism.展开更多
The rapid development of the network had a huge psychological impact on people＇ s life, ideas, and especially makes prominent phenomenon of mental disorder with the network, it has become attention of sociology, psyc...The rapid development of the network had a huge psychological impact on people＇ s life, ideas, and especially makes prominent phenomenon of mental disorder with the network, it has become attention of sociology, psychology, research of clinical industry. In recent years, research on the phenomenon of Internet addiction focused on qualitative descriptions and study of the theoretical phenomenon, their research focused on the popularity of the first network, the U.S. conducted the most extensive study and makes more online survey. China started this study later, and lack of systematic research on the network psychology, which just mostly understanding the aspect of the phenomenon and countermeasures of stating intemet addiction, or to explore from a single aspect （such as： age, gender, etc.）, it lack of theoretical studies of the psychological mechanisms and motives behind the addictive behavior on the network.展开更多
文摘数字版权管理(Digital Rights Management,DRM)保护对数字内容的合法使用,限制非法访问。DRM的权利描述及执行机制是DRM系统的核心。本文通过对各种权利描述机制的分类研究,分析比较了它们的特点及适用范围;最后根据分析研究的结果提出了构建广播电视数字版权管理系统权利描述机制的想法和建议。
基金Projects (10775018, 10702010, 50374073) supported by the National Natural Science Foundation of ChinaProject(2002CB412701) supported by the National Basic Research Program of China
文摘Based on the thermodynamics theory and physical micro-properties of solid materials subjected to external loading at room temperature,a formula of calculating temperature difference of infrared radiation in terms of the sum of three principal strains was deduced to quantitatively investigate the infrared radiation characteristics in test. Two typical specimens,the three-point bending beam and the disc pressed in diameter,were tested and their principal strains were calculated by finite element method in order to obtain the temperature differences of infrared radiation. Numerical results are in a good agreement with test results,which verifies the validity of the formula of calculating temperature differences of infrared radiation and the model of quantitatively describing the infrared radiation characteristics of solid materials,and reveals the corresponding inner physical mechanism.
文摘The rapid development of the network had a huge psychological impact on people＇ s life, ideas, and especially makes prominent phenomenon of mental disorder with the network, it has become attention of sociology, psychology, research of clinical industry. In recent years, research on the phenomenon of Internet addiction focused on qualitative descriptions and study of the theoretical phenomenon, their research focused on the popularity of the first network, the U.S. conducted the most extensive study and makes more online survey. China started this study later, and lack of systematic research on the network psychology, which just mostly understanding the aspect of the phenomenon and countermeasures of stating intemet addiction, or to explore from a single aspect （such as： age, gender, etc.）, it lack of theoretical studies of the psychological mechanisms and motives behind the addictive behavior on the network.
