O644.18 2000010280强激光场中离子HD<sup>+</sup>光解离几率的相于控制=Coherentcontrol of photodissociation of ion HD<sup>+</sup> inintense laser fields[刊,中]/王国文（北京大学物理系.北京（100871）...O644.18 2000010280强激光场中离子HD<sup>+</sup>光解离几率的相于控制=Coherentcontrol of photodissociation of ion HD<sup>+</sup> inintense laser fields[刊,中]/王国文（北京大学物理系.北京（100871））//光子学报.—1998,27（8）.—673-678对含时薛定谔方程用短时传播子的对称分割法求得了非微扰的数值解,计算了强超短脉冲基频激光（波长306.7 nm）与其三倍频激光作用下的离子HD<sup>+</sup>光解离的相干控制参量大小。设该离子的初态为电子—振动基态。其中的相干激发是共振的。二束光之间的相对相位变化从0°到360°。在基频和倍频激光强度各为5×10<sup>13</sup>W/cm<sup>2</sup>和5.09×10<sup>8</sup> W/cm<sup>2</sup>情形下。展开更多
In this paper, a novel motion texture approach is presented for synthesizing long character motion (e.g., kungfu) that is similar to the original short input motion. First, a new motion with repeated frames is generat...In this paper, a novel motion texture approach is presented for synthesizing long character motion (e.g., kungfu) that is similar to the original short input motion. First, a new motion with repeated frames is generated by exploiting the symmetric properties of the frames and reversing the motion sequence playback in a given motion sequence. Then, the order of the above motion sequence is rearranged by putting the start and the end frames together. The graphcut algorithm is used to seamlessly synthesize the transition between the start and the end frames, which is noted as graphcut-based motion-texton. Finally, we utilize the motion-textons to synthesize long motion texture, which can be patched together like the image texture synthesis method using graphcut algorithm, and automatically form a long motion texture endlessly. Our approach is demonstrated by synthesizing the long kungfu motion texture without visual artifacts, together with post-processing including our new developed graphcut-based motion blending and Poisson-based motion smoothing techniques.展开更多
3D视频的编码方法在HEVC(high efficiency video coding)的基础上有了较大的改动.针对这些改变,提出了一种基于纹理复杂度和运动方向的3D视频水印算法.首先,采用灰度共生矩阵和梯度矩阵分别对I帧中CTU(coding tree unit)和8 CU×8 C...3D视频的编码方法在HEVC(high efficiency video coding)的基础上有了较大的改动.针对这些改变,提出了一种基于纹理复杂度和运动方向的3D视频水印算法.首先,采用灰度共生矩阵和梯度矩阵分别对I帧中CTU(coding tree unit)和8 CU×8 CU(coding unit)纹理复杂度进行统计分析,将分析结果作为阈值选出P帧和B帧中纹理复杂度较高的8 CU×8 CU;其次,选择帧间预测模式为对称分割的块作为嵌入块,结合同位纹理块的运动矢量分量大小来确定嵌入的水印;最后,通过调制当前块运动矢量的搜索范围或修改区域最优运动矢量的大小来嵌入水印.本算法对不同视频序列平均嵌入容量达到613字节/帧,在不同QPs(quantization parameters)(25、30、35、40)值的重编码攻击下的平均误码率为13.31%,PSNR值平均下降仅为0.0075 dB,对合成视点质量几乎没有影响,同时鲁棒性好.展开更多
Consider the system of integral equations with weighted functions in Rn,{u(x) =∫Rn|x-y|α-nQ(y)v(y)qdy1,v(x)=∫Rn|x-y|α-nK(y)u(y)pdy,where 0 < α < n,1/(p+1) + 1/(q+1)≥(n-α)/n1,α/(n-α) < p1q < ∞1,Q(...Consider the system of integral equations with weighted functions in Rn,{u(x) =∫Rn|x-y|α-nQ(y)v(y)qdy1,v(x)=∫Rn|x-y|α-nK(y)u(y)pdy,where 0 < α < n,1/(p+1) + 1/(q+1)≥(n-α)/n1,α/(n-α) < p1q < ∞1,Q(x) and K(x) satisfy some suitable conditions.It is shown that every positive regular solution(u(x)1,v(x)) is symmetric about some plane by developing the moving plane method in an integral form.Moreover,regularity of the solution is studied.Finally,the nonexistence of positive solutions to the system in the case 0 < p1q <(n+α)/(n-α) is also discussed.展开更多
文摘O644.18 2000010280强激光场中离子HD<sup>+</sup>光解离几率的相于控制=Coherentcontrol of photodissociation of ion HD<sup>+</sup> inintense laser fields[刊,中]/王国文（北京大学物理系.北京（100871））//光子学报.—1998,27（8）.—673-678对含时薛定谔方程用短时传播子的对称分割法求得了非微扰的数值解,计算了强超短脉冲基频激光（波长306.7 nm）与其三倍频激光作用下的离子HD<sup>+</sup>光解离的相干控制参量大小。设该离子的初态为电子—振动基态。其中的相干激发是共振的。二束光之间的相对相位变化从0°到360°。在基频和倍频激光强度各为5×10<sup>13</sup>W/cm<sup>2</sup>和5.09×10<sup>8</sup> W/cm<sup>2</sup>情形下。
基金Project supported by the National Natural Science Foundation of China (Nos. 60573153 and 60533080), and Program for New Century Excellent Talents in University (No. NCET-05-0519), China
文摘In this paper, a novel motion texture approach is presented for synthesizing long character motion (e.g., kungfu) that is similar to the original short input motion. First, a new motion with repeated frames is generated by exploiting the symmetric properties of the frames and reversing the motion sequence playback in a given motion sequence. Then, the order of the above motion sequence is rearranged by putting the start and the end frames together. The graphcut algorithm is used to seamlessly synthesize the transition between the start and the end frames, which is noted as graphcut-based motion-texton. Finally, we utilize the motion-textons to synthesize long motion texture, which can be patched together like the image texture synthesis method using graphcut algorithm, and automatically form a long motion texture endlessly. Our approach is demonstrated by synthesizing the long kungfu motion texture without visual artifacts, together with post-processing including our new developed graphcut-based motion blending and Poisson-based motion smoothing techniques.
基金supported by Chinese National Science Fund for Distinguished Young Scholars (Grant No.10925104)National Natural Science Foundation of China (Grant No.11001221)+1 种基金the Foundation of Shaanxi Province Education Department (Grant No. 2010JK549)the Foundation of Xi’an Statistical Research Institute (Grant No.10JD04)
文摘Consider the system of integral equations with weighted functions in Rn,{u(x) =∫Rn|x-y|α-nQ(y)v(y)qdy1,v(x)=∫Rn|x-y|α-nK(y)u(y)pdy,where 0 < α < n,1/(p+1) + 1/(q+1)≥(n-α)/n1,α/(n-α) < p1q < ∞1,Q(x) and K(x) satisfy some suitable conditions.It is shown that every positive regular solution(u(x)1,v(x)) is symmetric about some plane by developing the moving plane method in an integral form.Moreover,regularity of the solution is studied.Finally,the nonexistence of positive solutions to the system in the case 0 < p1q <(n+α)/(n-α) is also discussed.
