supported by the National Natural Science Foundation of China (No. 60373012, 10871119);the Natural Science Foundation(No. ZR2009GM009, ZR2009AM013);the Promotional Foundation for Middle-aged or Young Scientists (No. BS2009DX024);the EDRP of Shandong Province (No. J10LG09)
Due to the limitation of energy resources, energy efficiency is a key issue in wireless sensor networks (WSNs). Clustering is proved to be an important way to realize hierarchical topology control, which can improve t...
Supported by Natural Sciences and Engineering Research Council of Canada;NNSF (Grant No. 10871119);RSDP (Grant No. 200804220001) of China
For any even integer k and any integer i, we prove that a (kr +i)-regular multigraph contains a k-factor if it contains no more than kr - 3k/2+ i + 2 cut edges, and this result is the best possible to guarantee t...
supported by National Natural Science Foundation of China (Grant No. 10871119);NaturalScience Foundation of Shandong Province (Grant No. Y2008A20).
A proper edge coloring of a graph G is called acyclic if there is no 2-colored cycle in G. The acyclic edge chromatic number of G, denoted by a (G), is the least number of colors in an acyclic edge coloring of G. Alon...