The tree-like structure is a common structure, which is used in many projects. Queries based on tree's attributes and queries based on node's attributes are the two frequently used query's patterns. Howeve...
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ISBN:
(纸本)9781509047963
The tree-like structure is a common structure, which is used in many projects. Queries based on tree's attributes and queries based on node's attributes are the two frequently used query's patterns. However, the existing storage models don't support both of them efficiently. In this paper, we propose a hybrid storage model, which stores nodes and relations between nodes separately, and we also build the inverted index between nodes and trees. The experiment results show that the hybrid storage model is more efficient than the existing models.
This paper presents a modified methodology based on the model reference adaptive control（MRAC） for tracking and stability with gravity compensation for the 5-link single support phase lower limb exoskeleton with ext...
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ISBN:
(纸本)9781509009107
This paper presents a modified methodology based on the model reference adaptive control（MRAC） for tracking and stability with gravity compensation for the 5-link single support phase lower limb exoskeleton with external *** from conventional methods,the proposed method is based on MRAC with adaptive error gain in the presence of external *** stability of the system is investigated by choosing an appropriate lyapunov function,that ensures the convergence of tracking error to *** effectiveness of proposed method has been verified with the help of simulation example.
The whale optimization algorithm (WOA) has less control parameters and it is easier to implement. The multi-objective whale optimization algorithm (MOWOA) also shows good exploration and exploitation capability. A mod...
ISBN:
(数字)9781728170817
ISBN:
(纸本)9781728170824
The whale optimization algorithm (WOA) has less control parameters and it is easier to implement. The multi-objective whale optimization algorithm (MOWOA) also shows good exploration and exploitation capability. A modified multi-objective whale optimization algorithm with dynamic leader selection mechanism (MMOWOA-DLS) is proposed. First, the opposition-based learning (OBL) is employed to accelerate the convergence speed. Second, a dynamic leader selection mechanism is utilized to improve the solution accuracy. Third, a modified archive grid controller is proposed to delete redundant solutions in external archive. The simulation results show that the performance of MMOWOA-DLS outperforms other algorithms.
The existing direction-of-arrival(DOA)estimation methods only utilize the current received signals,which are susceptible to *** this paper,a method for DOA estimation based on a motion platform is proposed to achieve ...
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The existing direction-of-arrival(DOA)estimation methods only utilize the current received signals,which are susceptible to *** this paper,a method for DOA estimation based on a motion platform is proposed to achieve high-precision DOA estimation by utilizing past and present *** concept of synthetic aperture is introduced to construct a linear DOA estima-tion model.A DOA fine-tuning method based on the linear model is proposed to eliminate the lin-ear DOA variation,achieving a non-coherent accumulation of DOA ***,the baseband modulation and the phase modulation caused by the range history are compensated to achieve the coherent accumulation of all the DOA *** results show that the proposed method can significantly improve the DOA estimated accuracy at low signal-to-noise ratios(SNR).
This paper presents a new method for adaptive spectrum segmentation. In the field of wideband spectrum sensing, spectrum segmentation is regarded as the first procedure to detect sub-band signals. Wavelet Transform(WT...
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This paper presents a new method for adaptive spectrum segmentation. In the field of wideband spectrum sensing, spectrum segmentation is regarded as the first procedure to detect sub-band signals. Wavelet Transform(WT) is sensitive to the rising and falling edges of signals in spectrum. Multi-scale WT can detect multi-width edges. The proposed method, based on the evaluation of the multi-scale WT, is designed for spectrum segmentation in multi-scale resolution FFT spectrum. Simulation results demonstrate that our method is validated on real satellite signals, and the results show good accuracy and flexibility of the sub-band signal detection.
The development of language models has been influencing approaches to relation extraction (RE) problems. Although large language models (LLMs) have demonstrated breakthrough potential in certain aspects, they are stil...
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In this paper, we propose a new algorithm, which is using NMF features and which is different from traditional algorithms using temporal variations of the spectrogram. The proposed algorithm has been tested in several...
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In this paper an FPGA-based implementation of Chaotic Pulse Position Modulation (CPPM) is described. The model of transmission in noisy channel is demonstrated. The result shows the operation, performance and feasibil...
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Most previous literature in the maneuvering target tracking community focus on 2D models or 3D models where target maneuvers mostly in a horizontal plane, and usually an acceptable accuracy can be expected when these ...
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Simultaneous wireless information and power transfer (SWIPT) is an effective energy-saving technology, but its efficiency is hindered by environmental factors. The introduction of reconfigurable intelligent surfaces (...
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