We study the exact formal solution to the simplified Keller-Segel system modelling chemotaxis. The method we use is series expanding. The main result is to attain the formal solution to the simplified Keller-Segel sys...We study the exact formal solution to the simplified Keller-Segel system modelling chemotaxis. The method we use is series expanding. The main result is to attain the formal solution to the simplified Keller-Segel system.展开更多
The story of silk is a fascinating one. About 4,000 years ago the Chinese discovered thesecret of the cocoon. No one knows exactly how or whenthis important discovery was made. One story says that ayoung princess was ...The story of silk is a fascinating one. About 4,000 years ago the Chinese discovered thesecret of the cocoon. No one knows exactly how or whenthis important discovery was made. One story says that ayoung princess was drinking tea in her garden andwatching the silkworms spin cocoons. By chance one drop-ped into her tea and the hot liquid softened it. When thegirl tried to take the cocoon out of her tea it unraveledand she pulled out a long silk thread.展开更多
在目标检索领域,当前主流的解决方案是视觉词典法(Bag of Visual Words,BoVW),然而,传统的BoVW方法具有时间效率低、内存消耗大以及视觉单词同义性和歧义性的问题。针对以上问题,该文提出了一种基于随机化视觉词典组和查询扩展的目标检...在目标检索领域,当前主流的解决方案是视觉词典法(Bag of Visual Words,BoVW),然而,传统的BoVW方法具有时间效率低、内存消耗大以及视觉单词同义性和歧义性的问题。针对以上问题,该文提出了一种基于随机化视觉词典组和查询扩展的目标检索方法。首先,该方法采用精确欧氏位置敏感哈希(Exact Euclidean LocalitySensitive Hashing,E2LSH)对训练图像库的局部特征点进行聚类,生成一组支持动态扩充的随机化视觉词典组;然后,基于这组词典构建视觉词汇分布直方图和索引文件;最后,引入一种查询扩展策略完成目标检索。实验结果表明,与传统方法相比,该文方法有效地增强了目标对象的可区分性,能够较大地提高目标检索精度,同时,对大规模数据库有较好的适用性。展开更多
文摘We study the exact formal solution to the simplified Keller-Segel system modelling chemotaxis. The method we use is series expanding. The main result is to attain the formal solution to the simplified Keller-Segel system.
文摘The story of silk is a fascinating one. About 4,000 years ago the Chinese discovered thesecret of the cocoon. No one knows exactly how or whenthis important discovery was made. One story says that ayoung princess was drinking tea in her garden andwatching the silkworms spin cocoons. By chance one drop-ped into her tea and the hot liquid softened it. When thegirl tried to take the cocoon out of her tea it unraveledand she pulled out a long silk thread.
