The Carlitz-Wan conjecture, which is now a theorem, asserts that for any positive integer n, there is a constant Cn such that if q is any prime power > Cn with GCD(n, q−1) > 1, then there is no permutation polynomial of degree n over the finite field with q elements. From the work of von zur Gathen, it is known that one can take Cn = n4. On the other hand, a conjecture of Mullen, which asserts ...

i Acknowledgements This story may track back to a discussion between Prof. Bob Su and Prof. Li Wan about a phenomenon they found from a satellite map, from which they found the upward latent heat flux at night. To understand that seeming conflict to the normal knowledge of evaporation, Prof. Li Wan and Wenbing Cao from Chinese University of Geosciences (Beijing) conducted a field experiment on ...

Bin-Yong Liang, Er-Lei Zhang, Jian Li, Xin Long, Wen-Qiang Wang, Bi-Xiang Zhi-Wei Yi-Fa Chen, Wan-Guang Bin Mei, Zhen-Yu Xiao, Jin Gu, Zun-Yi Shuai Xiang, Han-Hua Dong, Lei Peng Zhu, Qi Cheng, Lin Zhan-Guo Bin-Hao Wei Xiao-Feng Liao, Tao Yin, Dong-De Wu, Jiang, Yu-Feng Yuan, Zhong-Lin Yao-Bing Kai-Yan Wan Yee Lau, Xiao-Ping Zhi-Yong Huang

The demand for reliable and efficient Wide Area Networks (WANs) from business customers is continuously increasing. Companies enterprises use WANs to exchange critical data between headquarters, far-off branches cloud centers. Many solutions have been proposed over the years, such as: leased lines, Frame Relay, Multi-Protocol Label Switching (MPLS), Virtual Private (VPN). Each solution position...

We study the performance of Selective Acknowledgments with TCP over the ATM-UBR service category. We examine various UBR drop policies, TCP mechanisms and network con gurations to recommend optimal parameters for TCP over UBR. We discuss various TCP congestion control mechanisms compare their performance for LAN and WAN networks. We describe the e ect of satellite delays on TCP performance over...