Abstract. The performance of the decoding process of LT codes depends largely on its degree distribution. Due to the Significance of the degree distribution, the optimization of it is worth explored. In this paper, we propose a new method to design the degree distribution. We make modification to the robust soliton distribution through adding adjusted binary exponential distribution and modified Poisson distribution on RSD and controlling the weight of them. This method can combine the advantages of these degree distributions and highly improve the performance of encoding and decoding. Through simulation experiments, we have obtained the optimal value of weight and verified its better performance.

Abstract. Network coding can significantly improve the network communication performance; however, the introduction of encoding nodes will lead to more resource consumption. In this paper, we proposed an improved Min-cost Max-flow network coding algorithm to reduce resource consumption under the new principle of encoding node, which has been augmented until achieves the network maximum flow according to the min-cost path in the shortest paths from the source node to the sink node. Simulation results show that compared with the previous max-flow algorithm, this improved algorithm can not only reduce the total cost, but also reduce the encoding nodes and the network resource overhead when applied to the network coding.

Keywords: Web server cluster, Client proximity based load balance algorithm, Round robin scheme, Modified random allocation scheme.Abstract. Nowadays, the traffic to the popular site has increased dramatically. Some websites usually have different servers geographically distributed inconsistently can provide same service and these servers make up a web server cluster. In order to guarantee the QoE of clients, load balance scheme is necessary during the servers of the web server cluster. In this paper a novel load balancing algorithm which considers the proximity between client and server is proposed. We compare the Client Proximity Based Load Balancing algorithm (PBLB) with the Round Robin (RR) scheme and the Modified Random Allocation (MRA) scheme. Through the simulation results, we can see the PBLB algorithm has a better performance.

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