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Simulation-driven design can integrate the analysis and design together to provide a large amount of design knowledge at the early design phase, but at a cost of iterating between analysis and design. Because the heterogeneity of data representations in analysis and design impedes the translation between models in the two field, a framework based on curve met models is presented aiming at bridging...
One parallel underwater acoustic network (UAN) is designed to monitor the vortex induced vibration (VIV) of free span of subsea infield pipeline in the harsh deep water environment. The architecture consist of one mater node and several source node which one kind of dense network. One underwater Orthogonal Frequency Division Multiple Access (UOFDMA) scheme is proposed to meet with the multiple access...
Cooperative communication is becoming an increasingly important issue in the underwater acoustic networks (UAN). However, existing cooperative scheme generally do not take into account the node mobility which cannot be used for the mobile UAN. A cooperative power and frequency joint allocation AF (amplify-and-forward) scheme based on game theory is proposed for mobile UAN. At first, one mobile UAN...
Subsea pipelines are very susceptible to encounter failure. One novel method based on underwater acoustic network (UAN) is proposed to monitor free span of subsea pipeline. It considers the characteristics of shallow water and complex response of subsea pipeline, defines the principle of parallel cooperative transmitting of data package and the scheme of cross layer design that take into physical...
Traffic Matrices, which capture the network traffic volumes among end-points, are widely used in Internet Engineering. A traffic matrix is generally estimated from link loads because it is impossible to measure each flow directly in a large scale IP network. The estimation problem is usually considered to be an optimization model with a routing constraint which relates the traffic matrix with link...
Many high-resolution methods suffer from serious drawbacks. Indeed, they are not able to process more than N-1 noncoherent sources from an array of N sensors and are weakly robust to the presence of a strong colored background noise whose spatial coherence is unknown. Mainly to overcome these limitations and in particular to increase both the resolution and the number of sources to be processed from...
A subgroup H of a group G is called -z-supplemented in G if there exists a subgroup K of G, such that G = H K and H ∩ K ≤ Z ∞ (G), where Z ∞ (G) is the -hypercenter of G. We obtain some results about the -z-supplemented subgroups and use them to determine the structure of some groups.
The incidence of osteochondroma is rare and only 2% of such tumors are found in the spine area. When they are found in the vertebral column, less than 1% of all osteochondromas and few tumors occur in the thoracic vertebrae. An osteochondroma arising from the transverse process of the vertebra is even rarer, especially following from the thoracic transverse process. Here we report a giant solitary...
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