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In wireless sensor networks, the connectivity-based localization protocols are widely studied due to low cost and no requirement for special hardware. Many connectivity-based algorithms rely on distance estimation between nodes according to their hop count, which often yields large errors in anisotropic sensor network. In this paper, we propose a virtual potential field algorithm, in which the estimated...
Memory bandwidth severely limits the scalability and performance of today's multi-core systems. Because of this limitation, many studies that focused on improving multi-core scalability rely on bandwidth usage predictions to achieve the best results. However, existing bandwidth prediction models have low accuracy, causing these studies to have inaccurate conclusions or perform sub-optimally. Most...
A novel blind separation algorithm based on double compression for single-channel JPEG permuted image was proposed in this paper. Firstly, the permuted image was compressed again, and then the primary compression factors were estimated by calculating the correlation coefficients of image blocks in pre and post recompression. Secondly, a `mapping space' was constructed based on the primary compression...
In this paper, a review focused on the control theory of induction machines (IM) is presented. Then, the influences of dead time and voltage drop of switching devices are discussed. Consequently, considering both effects of dead time and voltage drop, an improved stator flux observation strategy for the direct torque controlled (DTC) EVI drive system is proposed. A simulation model is developed and...
The characteristic of high precise and real-time simulation of satellite navigation observation was analyzed in this paper. And the principle, function composing and high fidelity mathematical models used in observation simulation were studied. Because of the different time constrains to realize different models, the architecture of simulation system was mainly divided into three parts: namely non...
Dead reckoning using odometry/INS can enhance the positioning accuracy compared with INS alone because odometry measurement errors wonpsilat grow over time. The scaling error of odometry, however, turns to be the main factor influencing on the system performance. So an improved odometry/INS integration approach is proposed that calibrate the scaling error real time at the beginning stage of integration...
The extensive clayization of Dexing copper mine is responsible for water and soil pollutions because of the oxidation of sulfide minerals. During the clayization, harmful elements such as As, S, Sb and Pb could be effectively released into the clay and water. Using the abundant spectral information of short wave infrared (SWIR), combining with the spectral absorbed index, SAM (Spectrum Angle Mapper)...
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