Peng Wang

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By posing the problem of bandwidth allocation as a constrained maximization problem, it is possible to study various features of optimal bandwidth allocation, and hence the capacity of the network. However, since the typical approach to this problem requires optimizing over a space that is exponential in the number of links, the problem has appeared to be(More)
The adaptive learning system is a hotspot in the field of E-learning and intelligent education researches. Learner model is the key to and core of adaptive learning system. Combined with domestic and international learner model standards of E-learning and characteristics of adaptive learning systems, this paper does research and explore about the(More)
It is well known that the maximum weighted independent set (MWIS) problem is NP-complete. Moreover, optimal scheduling in wireless networks requires solving a MWIS problem. Consequently, it is widely believed that optimal scheduling cannot be solved in practical networks. However , there are many cases where there is a significant difference between(More)
There has been extensive research focused on maximizing the throughput of wireless networks in general and mesh networks in particular. Recently, techniques have been developed that reliably compute the maximum throughput of mesh networks. However, different approaches to throughput optimization make different assumptions on the physical layer's abilities.(More)
Interference and collisions greatly limited the throughput of mesh networks that used contention-based MAC protocols such as 802.11. Significantly higher throughput is achievable if transmissions are scheduled. However, traditional methods to compute such schedules are so computationally complex that they can only be used on relatively small networks. This(More)
The integration of sensory signals from different modalities requires flexible interaction of remote brain areas. One candidate mechanism to establish local and long-range communication in the brain is transient synchronization of neural assemblies. In addition to the analysis of oscillatory power, assessment of the phase dynamics of multiple brain signals(More)
Interference and collisions greatly limit the throughput of mesh networks that use contention-based MAC protocols such as IEEE 802.11. Significantly higher throughput is achievable if transmissions are scheduled. However, traditional methods to compute optimal schedules are computationally intractable (unless co-channel interference is neglected). This(More)
—Interference and collisions greatly limit the through-put of mesh networks that use contention-based MAC protocols such as 802.11. Significantly higher throughput is achievable if transmissions are scheduled. However, traditional methods to compute optimal schedules are computationally intractable (unless co-channel interference is neglected). This paper(More)
In the networking research literature, the problem of network utility optimization is often converted to the dual problem which, due to nondifferentiability, is solved with a particular subgradient technique. This technique is not an ascent scheme, hence each iteration does not necessarily improve the value of the dual function. This paper examines the(More)