Search

Your search keyword '"Du, Keqin"' showing total 9 results
Start Over Author "Du, Keqin" Search Limiters Full Text
9 results on '"Du, Keqin"'

4. A Digital Compressed Sensing-Based Energy-Efficient Single-Spot Bluetooth ECG Node

Author

Du Keqin, Jianqing Li, Xiangyu Zhang, Zhipeng Cai, Fumin Zou, and Kan Luo

Subjects
lcsh:Medical technology, Article Subject, Computer science, 0206 medical engineering, Real-time computing, Biomedical Engineering, Health Informatics, 02 engineering and technology, law.invention, Bluetooth, law, 0202 electrical engineering, electronic engineering, information engineering, Discrete cosine transform, Wireless, Humans, lcsh:R5-920, business.industry, Node (networking), 020206 networking & telecommunications, Signal Processing, Computer-Assisted, Energy consumption, Equipment Design, 020601 biomedical engineering, Compressed sensing, lcsh:R855-855.5, Electrocardiography, Ambulatory, Surgery, business, lcsh:Medicine (General), Wireless Technology, Algorithms, Biotechnology, Efficient energy use, Data compression, Research Article
Abstract

Energy efficiency is still the obstacle for long-term real-time wireless ECG monitoring. In this paper, a digital compressed sensing- (CS-) based single-spot Bluetooth ECG node is proposed to deal with the challenge in wireless ECG application. A periodic sleep/wake-up scheme and a CS-based compression algorithm are implemented in a node, which consists of ultra-low-power analog front-end, microcontroller, Bluetooth 4.0 communication module, and so forth. The efficiency improvement and the node’s specifics are evidenced by the experiments using the ECG signals sampled by the proposed node under daily activities of lay, sit, stand, walk, and run. Under using sparse binary matrix (SBM), block sparse Bayesian learning (BSBL) method, and discrete cosine transform (DCT) basis, all ECG signals were essentially undistorted recovered with root-mean-square differences (PRDs) which are less than 6%. The proposed sleep/wake-up scheme and data compression can reduce the airtime over energy-hungry wireless links, the energy consumption of proposed node is 6.53 mJ, and the energy consumption of radio decreases 77.37%. Moreover, the energy consumption increase caused by CS code execution is negligible, which is 1.3% of the total energy consumption.

Published
2018

8. Effect of Energy Density on Microstructure and Properties of Al2O3 Plasma Electrolysis Oxidation Film

Author

Guo, Xinghua, Du, Keqin, Guo, Quanzhong, Wang, Yong, and Wang, Fuhui

Abstract

The effect of exported energy density on the plasma electrolysis oxidation (PEO) process was studied under transient self-feedback control (TSFC) mode. Properties of the Al2O3 PEO films were characterized by scanning electron microscopy (SEM), Vickers hardness test and electrochemical impedance spectroscopy (EIS). Experimental results indicated that a hard and compact PEO film was obtained at a correct energy density due to the uniform action of the high-frequency square voltage waveform (HFSVW). On the contrary, the high energy density greatly weakened the uniform action of the HFSVW which resulted in large pores and microcracks in the PEO films.

Published
2013

9. Effect of Energy Density on Microstructure and Properties of Al2O3Plasma Electrolysis Oxidation Film

Author

Guo, Xinghua, Du, Keqin, Guo, Quanzhong, Wang, Yong, and Wang, Fuhui

Abstract

The effect of exported energy density on the plasma electrolysis oxidation (PEO) process was studied under transient self-feedback control (TSFC) mode. Properties of the Al2O3PEO films were characterized by scanning electron microscopy (SEM), Vickers hardness test and electrochemical impedance spectroscopy (EIS). Experimental results indicated that a hard and compact PEO film was obtained at a correct energy density due to the uniform action of the high-frequency square voltage waveform (HFSVW). On the contrary, the high energy density greatly weakened the uniform action of the HFSVW which resulted in large pores and microcracks in the PEO films.

Published
2013
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results