Solving the eigenvalues of matrices is an open problem which is often related to scientific computation. With the increasing of the order of matrices, traditional sequential algorithms are unable to meet the needs for...
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In the procedure of three-way handshake of transmission control protocol connection establishment, it involves the management of half-connection and connection tables. However, in the famous networks simulator NS2, th...
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In the procedure of three-way handshake of transmission control protocol connection establishment, it involves the management of half-connection and connection tables. However, in the famous networks simulator NS2, there is only a formal description instead of a concrete and complete implementation for the procedure of TCP connection establishment. An improvement was beed made on the point. Table structures for half-connections and connections are added, and the way of managing half-connection table in Linux kernel is also imported into NS2. Simulation results show that it is clear to monitor the change in half-connection table in the TCP connection establishment procedure, and thus the requirement of simulating the connection establishment procedure in studies such as protection from TCP SYN flooding attack can be met.
Router alias resolution is one of hard problems and important steps for router level Internet topology measurement based on traceroute mechanism, and the topology characteristic of the generated router level topology ...
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Router alias resolution is one of hard problems and important steps for router level Internet topology measurement based on traceroute mechanism, and the topology characteristic of the generated router level topology graph has close relationship with the completeness of alias resolution. The graph with its degrees following power-law distribution was taken as the base-graph, and the shortest paths from one source to others were computed for simulating topology measurement. Experiment results show that it is very probable to see different topology characteristics between the derived graph and the base-graph due to incomplete alias resolution. Most importantly, for large-scale router level topology measurement, the completeness of alias resolution must be improved with the increasing number of probe sources, and in this way the derived topology graph could be approximate to the real topology graph.
Power control is a complex issue in routing since the increase of transmission power supplies more opportunities to select optimal routes due to the fact that more links are available. However, conversely, it also imp...
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Memory-based collaborative filtering algorithms have been widely adopted in many popular recommender systems, however the rating data are very sparse, which affects prediction accuracy greatly. To solve this problem, ...
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Memory-based collaborative filtering algorithms have been widely adopted in many popular recommender systems, however the rating data are very sparse, which affects prediction accuracy greatly. To solve this probl...
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Memory-based collaborative filtering algorithms have been widely adopted in many popular recommender systems, however the rating data are very sparse, which affects prediction accuracy greatly. To solve this problem, we use expert opinions to improve prediction accuracy. Firstly, we propose a novel similarity measure in order to highlight users' background. Then, combining users' ratings with expert opinions, the prediction get a right balance in both expert professional opinions and similar users. Finally, since SVD-based collaborative filtering algorithms shows good performance on the prevention of noise, we use it to smooth the prediction. Experiments of MovieLens have shown that our proposed method improves recommendation quality obviously.
This paper focuses on the problem of data clustering in wireless sensor networks (WSNs). The data time window is a landmark window, from the time WSN starts working up to the current time. The objective is to group se...
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In this paper, we investigate on the optimal routing jointly scheduling, channel and power assignment in multi-power multi-radio WSNs. We first formulate the optimal routing as a linear programming problem, and then d...
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In this paper, we investigate on the optimal routing jointly scheduling, channel and power assignment in multi-power multi-radio WSNs. We first formulate the optimal routing as a linear programming problem, and then design a polynomial time heuristic algorithm. Experiments show that the proposed cross-layer routing significantly reduce the energy consumption and the end-to-end transmission delay.
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