Kungmeng Lo

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Shared link and shared path protections have been recognized as preferred schemes to protect traffic flows against network failures. In recent years, another method referred to as shared segment protection has been studied as an alternative solution for protection. This method is more flexible and efficient in terms of capacity utilization and restoration(More)
We propose a joint optimization model for capacity design of networks with p-cycles. The model is based on a modified definition of network fundamental cycles and the available straddling links. Concepts about visible and hidden straddling links, which are essential components of our model are also introduced. This is the first ILP model for joint(More)
P-cycles have been recognized as a useful protection scheme in WDM mesh networks. This is a type of shared link protection that not only retains the mesh-like capacity efficiency, but also achieves the ring-like protection switching speed. However, finding the optimal set of p-cycles for protecting traffic demands is not a simple task and is an NP-hard(More)
Using p-Cycles to protect against single span failures in Wavelength-Division Multiplexing (WDM) networks has been widely studied. p-Cycle retains not only the speed of ring-like restoration, but also achieves the capacity efficiency over mesh networks. However, in selecting an optimal set of p-cycles to achieve the minimum spare capacity and fast(More)
In this paper, we investigate a possible solution for supporting VCR functionality in broadcast environment with peer-to-peer paradigm. Unlike the conventional approaches that the merging process is done by the central server during VCR actions, it is handled in P2P manner in our framework. The main focus of this paper is to study how system parameters,(More)
In this paper, we propose a heuristic approach for finding optimal protection cycles in wavelength-division multiplexing (WDM) mesh networks. To guarantee optimality, all cycles are considered as candidates in our study. When the working capacity is known, our first step is to create all cycles using the span-based cycles (SBC) algorithm. Then the heuristic(More)
An encoder-dependent video cut detection algorithm is proposed. Based on the inertia property of natural videos, the proposed algorithm detects video cuts in the video-coding loop by making use of the intermediate results of video compression. Experiments show that the detection performance of the proposed algorithm is quite good as compared to previous(More)
p-cycle is a type of shared link protection for survivable wavelength-division multiplexing (WDM) mesh networks. p-cycle not only retains ring-like restoration speeds, but also achieves capacity efficiency in mesh networks. However, finding the optimal set of p-cycles to protect all traffic demands within a reasonable response time is difficult. This is(More)
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