The existence of several non-symmetric balanced incomplete block designs (BIBDs) is still unknown. This is because the non-existence property for non-symmetric BIBDs is still not known and also the existing constructi...
This work is supported by the National Natural Science Foundation of China (grants No. 11671344, 11531011 and 11701492).
We characterize all connected graphs with exactly three distinct normalized Laplacian eigenvalues among which one is equal to 1, and determine all connected bipartite graphs with at least one vertex of degree 1 having...
Supported by the National Natural Science Foundation of China(No.61340005);Beijing Natural Science Foundation(No.4132012);Beijing Education Committee Science and Technology Development Plan(No.KM201411232011);Beijing Outstanding Personnel Training Project(No.2013D005007000006);Scientific Research Improving Project-Intelligent Sense and Information Processing(No.5211524100)
In this work,an optimal Q algorithm based on a collision recovery scheme is presented. Tags use BIBD-( 16,4,1) codes instead of RN16 s. Therefore,readers can make a valid recognition even in collision slots. A way of ...