人工智能在非物质文化遗产中的创新设计研究：以景泰蓝为例

目的运用人工智能进行非物质文化遗产的数字化保护和创新设计,已成为当下文化建设的重要任务。非物质文化遗产的保护需要应用交叉学科领域的知识和人工智能中的深度学习等方式,对非物质文化遗产的创新设计进行研究。人工智能可以更加精准地诠释非物质文化遗产的信息内容,表达信息理念,更加形象化、细节化、视觉化地实现非物质文化遗产传承的目的。方法从人工智能赋能非物质文化遗产的数字化、信息化、网络化、智能化四个方面,进行非物质文化遗产的保护、传承和传播的路径研究。结论以景泰蓝制作工艺的数字创新设计为例,提出人工智能应用在非物质文化遗产的数字创新设计中的设计细则,丰富了传统设计的方法,更好地调动了参与者的主动性和热情,带给观者更好的观赏体验,为中国数字文化遗产及数字文化创意产业提供了参考。     

级联H桥型电力电子变压器的闭锁状态等效建模方法

电力电子变压器(power electronic transformer,PET)是未来交直流混合配电网的关键设备,对其进行多工况高效仿真的一个关键难点为闭锁等效建模。该文提出一种适用于级联H桥型PET(cascaded H-bridge based PET,CHB-PET)闭锁状态的等效建模方法。首先,以一个实际算例说明闭锁状态的电路特征;其次,经过合理简化后,推导部分闭锁和完全闭锁状态下的戴维南-诺顿等效参数;然后,分析闭锁等效模型的3种实施方式,提出一种与非闭锁模型共用状态变量存储单元的集成方法;最后,在PSCAD/EMTDC软件中搭建典型的10kV/3kV三相CHB-PET系统,并进行启动、电压暂降及直流故障闭锁工况仿真。结果表明,与详细模型相比,所提闭锁等效模型具有足够的仿真精度。     

Forensic psychology opportunities in Canadian graduate programs: An update of Simourd and Wormith's (1995) survey.

Forensic psychology has gained momentum in North America in recent decades, and Canadian psychologists have made considerable contributions to the field. Strong student interest and a high demand for professionals, however, have not been sufficiently matched with the availability of formal forensic psychology graduate training, nor with sufficient scholarly discussion of this issue. The purpose of the current study was to update Simourd and Wormith's (1995) survey of forensic psychology training available in Canadian psychology graduate programs. Of the 39 universities with psychology graduate programs, 36 (92%) responded to the survey. Twenty-four universities (67%) offered some forensic opportunities for students, although there was considerable variability in the number of courses, students, and faculty members in the forensic psychology programs. Since Simourd and Wormith's (1995) survey, forensic training is available at 10 new universities. Of the 14 programs with forensic psychology content in 1995 and in the current study, however, more than half of them reported a decrease in the number of faculty and students working with forensic issues. Considering the continued demand for trained forensic psychologists in applied settings, further attention to the availability of both education and training in forensic psychology is therefore still needed. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

二次NURBS曲线的退化曲线

NURBS曲线是几何造型中广泛使用的曲线拟合工具.当某一权因子趋向于无穷时,NURBS曲线趋于相应的控制顶点,当所有权因子趋向于无穷时,其极限曲线的几何性质目前还没有结论.利用NURBS曲线的节点插入算法,将NURBS曲线转化为分段有理Bézier曲线,结合有理Bézier曲线的退化理论,得到当所有权因子趋向于无穷时其退化曲线的几何结构.     

校正源条件下基于双星序列观测量的地面运动目标定位算法及理论性能分析

The method for locating a moving source on earth using a sequence of time difference of arrival(TDOA)and frequency difference of arrival(FDOA)measurements pairs obtained by dual-satellites was presented in the presence of calibration sources with accurate positions.First,the difference calibration(DC)location algorithm aiming to the mobile target was derived,and its theoretical performance was also analytically derived.The result demonstrates that the DC localization variance could not reach the CRB,although it could eliminate the location bias produced by the position and velocity errors of the dual-satellites.For this reason,a two-step optimal association location algorithm was proposed,and its theoretical performance was proved to be equal to the CRB.Finally,a variety of numerical experiments are performed to corroborate the superiority of the geolocation algorithms and the effectiveness of the performance analysis.     

曲线运动导轨的设计方法研究

曲线运动导轨主要应用于轻工机械、非标自动化设备的传动导向,实现机械执行部件曲线运动轨迹的要求。为了满足机械产品工作部件的曲线运动轨迹和运动性能要求,对曲线运动导轨的使用场合和应用形式进行了分析,对曲线导轨的导轨曲线设计方法进行了研究,提出了直接等距法、逼近等距法和多项式法等三种导轨曲线的设计方法,详细给出了各种设计方法的基本原理,提高了曲线导轨的设计精度和导向准确性,进而满足了曲线传动的实际应用要求。     

有理Bézier曲线二阶导矢的界

有理Bézier曲线二阶导矢界的估计在CAGD中有重要的应用。把有理Bézier曲线的分子和分母分别看成整体,按照求导法则,得到有理Bézier曲线二阶导矢的表达式。由于求导会降低Bernstein基函数的次数,鉴于获取更好的估计式的需要,对其进行必要的升阶,使Bernstein基函数的阶数一致。利用有关的不等式的结论得出有理Bézier曲线二阶导矢界的估计式。     

容积卡尔曼滤波在空间目标轨道确定中的应用

针对空间监视雷达的近地目标轨道确定问题,提出了基于容积卡尔曼滤波的精密轨道确定方法,与被广泛应用的扩展卡尔曼滤波方法相比,所提方法具有更高的定轨精度. 同时,由于容积卡尔曼滤波在理论上具有严格的数学证明,其在处理空间目标复杂运动问题的过程中具有更好的数值稳定性. 通过引入递推形式的后验克拉美罗界,分析了不同观测模型对定轨性能的影响. 利用仿真数据进一步验证了所提出方法的有效性和分析的正确性.     

CXM型超细分级磨风口环气相流场的数值模拟

为探究CXM型超细分级磨风口环处结构参数与操作参数对粉碎区粉碎效果的影响,采用标准k-ε两方程湍流模型及多重参考系MRF模型对粉碎室内气相流场进行数值模拟。结果表明:在相同空气进风量及同一转速下,减小径向间隙有利于破坏物料环流层,当间隙为5～10 mm时,所形成的上升气流有助于物料的粉碎与分级。转盘转速的大小,一方面考虑转盘材质对转速的限制,另一方面应根据物料的物化特性结合生产经验确定转盘转速,以达到能量利用率最高。     

Empirical Assessment of Bacillus Calmette-Guérin Vaccine to Combat COVID-19

COVID-19 has become one of the critical health issues globally, which surfaced first in latter part of the year 2019. It is the topmost concern for many nations’ governments as the contagious virus started mushrooming over adjacent regions of infected areas. In 1980, a vaccine called Bacillus Calmette-Guérin (BCG) was introduced for preventing tuberculosis and lung cancer. Countries that have made the BCG vaccine mandatory have witnessed a lesser COVID-19 fatality rate than the countries that have not made it compulsory. This paper’s initial research shows that the countries with a long-term compulsory BCG vaccination system are less affected by COVID-19 than those without a BCG vaccination system. This paper discusses analytical data patterns for medical applications regarding COVID-19 impact on countries with mandatory BCG status on fatality rates. The paper has tackled numerous analytical challenges to realize the full potential of heterogeneous data. An analogy is drawn to demonstrate how other factors can affect fatality and infection rates other than BCG vaccination only, such as age groups affected, other diseases, and stringency index. The data of Spain, Portugal, and Germany have been taken for a case study of BCG impact analysis.