分类： 心理学 >> 认知心理学 提交时间： 2019-10-23
摘要： 基于同形语素抑制效应，本研究探讨了汉语复合词视觉识别中的形音义激活进程。结果发现：（1）同形异音、同形同音、相同条件相对于控制条件都产生了语素启动效应；（2）在P2、晚期N400成分上，同形同音条件与控制条件更为接近，但与同形异音及相同条件差别显著；（3）在早期N400成分上，同形同音条件与相同条件更为接近，但与同形异音条件差别显著。研究表明，汉语复合词的视觉识别的早期阶段可能为基于词位的形态-正字法加工，字形匹配与音位信息是首要影响因素，但语义是否介入仍未可知；而晚期阶段则可能为基于词条的形态-语义加工，主要涉及语义竞争与选择。本研究结果支持了McClelland等学者提出的“平行分布加工模型”。
分类： 数学 >> 建模与仿真 提交时间： 2019-10-23
摘要： Radiation symmetry evaluation is critical to the laser driven Inertial Confinement Fusion (ICF), which is usually done by solving a view-factor equation model. The model is nonlinear, and the number of equations can be very large when the size of discrete mesh element is very small to achieve a prescribed accuracy, which may lead to an intensive equation solving process. In this paper, an efficient radiation symmetry analysis approach based on sparse representation is presented, in which, 1) the Spherical harmonics, annular Zernike polynomials and Legendre-Fourier polynomials are employed to sparsely represent the radiation flux on the capsule and cylindrical cavity, and the nonlinear energy equilibrium equations are transformed into the equations with sparse coefficients, which means there are many redundant equations, 2) only a few equations are selected to recover such sparse coefficients with Latin hypercube sampling, 3) a Conjugate Gradient Subspace Thresholding Pursuit (CGSTP) algorithm is then given to rapidly obtain such sparse coefficients equation with as few iterations as possible. Finally, the proposed method is validated with two experiment targets for Shenguang II and Shenguang III laser facility in China. The results show that only one tenth of computation time is required to solve one tenth of equations to achieve the radiation flux with comparable accuracy. Further more, the solution is much more efficient as the size of discrete mesh element decreases, in which, only 1.2% computation time is required to obtain the accurate result.
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