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In this paper, we analyze the propagation effects of hilly and mountainous terrain on lightning magnetic fields by using a three-dimensional (3-D) finite-difference time domain (FDTD) method. We show that the waveshape, peak value and time delay of the magnetic fields can be significantly affected when propagating along a hilly terrain. It is found in particular that the time delay of the magnetic...
When high voltage direct current (HVDC) system is under the monopolar operation mode, huge direct current (DC) is injected into the earth through the DC grounding electrode, which will result in earth potential changes in a wide range of area. In this case, DC will be coupled into the nearby alternating current (AC) power grid and have some bad influences, called DC bias phenomenon, on the measuring...
With the advantages of small size and low cost RSSI-based ranging and positioning technology is suitable for the large-scale applications or indoor environments. Whereas multipath structure of indoor radio channel caused by complex indoor environment, as well as the far field conditions of antennas are not feasible due to the short propagation distance, have a strong impact on indoor positioning accuracy...
Much importance is attached to the weights on the edges in a network, but in actual fact what makes up a network is both the nodes and the edges linking up the network. It is therefore pertinent to investigate the effects and importance of the weights attributed unto the nodes in a network as well as the weights on the links of such networks as they both play important roles in determining the prominence...
A new search algorithm based on the hydrogen bond shape complementarity and relaxation labeling for fast protein-ligand docking is proposed. Given that the protein-ligand binding sites are demonstrated to relate with the cavities in the protein structure, Fpocket was used to identify the pockets on the proteins. Then based on the hydrogen bond model, the protein pockets as well as the ligand can be...
Recently, there has been increasing interest in extending relational query processing to efficiently support extraction operators, such as dictionaries and regular expressions, over text data. Many text processing queries are sophisticated in that they involve multiple extraction and join operators, resulting in many possible query plans. However, there has been little research on building the selectivity...
In this study, we present a systematic method for early detection of mild cognitive impairment (MCI) from magnetic resonance images (MRI) using image differences and clinical features. Early detection of MCI has pivotal importance to delay or prevent the onset of Alzheimer's disease (AD). Subjects were selected from the Open Access Series of Imaging Studies (OASIS)database and included 89 MCI subjects...
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