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57 results on '"Mengxing Liu"'

51. A Novel Body Posture Recognition System on Bed

Author

Mengxing Liu and Shuming Ye

Subjects
medicine.medical_specialty, Supine position, business.industry, Body posture, Pressure sores, Healthy subjects, 02 engineering and technology, medicine.disease, Obstructive sleep apnea, 03 medical and health sciences, Naive Bayes classifier, 0302 clinical medicine, Physical medicine and rehabilitation, 0202 electrical engineering, electronic engineering, information engineering, Recognition system, Medicine, 020201 artificial intelligence & image processing, business, 030217 neurology & neurosurgery, Kappa
Abstract

Diseases such as positional obstructive sleep apnea and pressure sores are closely related to body postures on a bed. To estimate body postures reliably and comfortably, we proposed a novel classification system using unconstrained measurements of ballistocardiogram (BCG) signals. A flexiblepiezo-electric polymer film sensor was embedded in a mattress to collect BCG data. The amplitude features based on the morphology of BCG were applied to Bayesian classifier with piecewisesmoothing correction. Twelve healthy subjects participated in the experiment. The final average prediction accuracies of four common body postures (supine, left lateral, prone and right lateral) on the bed all exceeded 97%, and a list of kappa coefficients calculated from classification results of subjects demonstrated almost perfect agreement. Overall, the developed system represents a brand new thinking in building an unobtrusive solution for body posture monitoring in our daily lives.

Published
2018
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52. Impact of Seed Maturation and Drought on Seed Germination and Early Seedling Growth in White Clover (Trifolium repens L.).

Author

Ruqiang Tong, Xinyuan Liu, Bifan Mu, Junfeng Wang, Mengxing Liu, Yanchun Zhou, Baolin Qi, Yanan Li, and Chunsheng Mu

Subjects
WHITE clover, GERMINATION, DROUGHTS, SEEDS, SEEDLINGS, ANIMAL coloration
Abstract

Background: Understanding the drought tolerance of white clover seeds during germination and early seedling growth and how that is linked to seed maturation in legume species, is crucial to developing new stand establishments. Methods: An experiment was conducted in Randomized Block design in two factorial concept to explore how seed maturation and drought tolerance influence seed germination and early seedling growth using the two factors: seed coat color (yellow and brown, two levels as one factor) and drought intensity (control: 0 MPa [distilled water], mild drought: -0.2 MPa, moderate drought: -0.4 MPa and severe drought: -0.6 MPa, four levels as another factor). Result: In contrast to the yellow-coated seeds, the mean germination percentage, germination index, seedling vigour index and radicle length of the brown-coated seeds were lowered by 7.9%, 23.1%, 20.5% and 12.9%, respectively. Compared to the control, introducing drought conditions reduced the mean of germination percentage, germination index, seedling vigour index and radicle length of yellow-coated seeds by 52.4%, 64.1%, 41.9% and 23.2%, respectively. Meanwhile, drought affected brown-coated seeds more than yellow-coated seeds. The results indicating that the seed quality of white clover seed lots with yellow-colored coats higher than the seed lots with brown-coloured coats. In agronomic practice, a larger proportion of yellow-coated seeds should be harvested to improve new stands successful establishment under environment easy to dry. [ABSTRACT FROM AUTHOR]

Published
2021
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54. [Wearable Medical Devices' MCU Selection Analysis Based on the ARM Cortex-MO+ Architecture]

Author

Zaoquan, Wu, Mengxing, Liu, Liping, Qin, Shuming, Ye, and Hang, Chen

Subjects
Electric Power Supplies, Monitoring, Ambulatory, Durable Medical Equipment
Abstract

According to the characteristics of low cost, high performance, high integration and long battery life of wearable medical devices, the mainstream low-power microcontroller(MCU) series were compared, and came to the conclusion that the MCU series based on ARM Cortex-M0+ architecture were suitable for the development of wearable medical devices. In aspects of power consumption, operational performance, integrated peripherals and cost, the MCU series based on Cortex-M0+ architecture of primary semiconductor companies were compared, aimed at providing the guides of MCU selection for wearable medical devices.

Published
2015

55. [Optimal design of portable ambulatory blood pressure monitor based on STM32L]

Author

Mengxing, Liu, Lechuan, Zhou, Chao, Huang, Shuming, Ye, and Hang, Chen

Subjects
Humans, Equipment Design, Blood Pressure Monitoring, Ambulatory, Software
Abstract

Based on the 32-bit ultra low power microcontroller STM32L151RBT6 using ARM Cortex-M3 kernel, the portable ambulatory blood pressure monitor powered by two AA batteries was designed. In order to insure the stability of power supply and prevent overpressure of cuff, super capacitor technology and new kind of safety logic circuits were used. The experimental result shows that: this solution is accurate and stable, which has high safety coefficient and a great clinical application value.

Published
2015

56. Larger Seed Size Shows Less Germination and Seedling Growth Decline Caused by Seed Ageing under Na2CO3 Stress in Leymus chinensis.

Author

Yunna Ao, Junfeng Wang, Mengxing Liu, Jiao Wang, Knops, Johannes M. H., and Chunsheng Mu

Abstract

Understanding of seed germination in sodic soils is needed to accelerate the restoration process in degraded saline-sodic grassland. The objective of this study was to determine the influence of seed age (2 vs. 6 yr) and seed size (small vs. large) on seed germination and seedling growth in sodic grasslands. Older seeds (6 vs. 2 yr) reduced seed germination by 29%, germination potential by 36%, and the seedling vigor index by 52%. Seed size (small vs. large) reduced seed germination by 18%, germination potential by 20%, and seedling vigor by 19%. Sodic salt stress (>10 mM Na2CO3) decreased germination by 64%, germination potential by 68%, and seedling vigor index by 33%. Sodic salt stress decreases in seed germination and seedling vigor increased with seed age. These findings suggest that younger and large seeds are preferable for restoration efforts in sodic soils. Thus, in regions where the soil has a high level of sodicity, we suggest that large seeds be selected and stored only for a short period of time for seeding. [ABSTRACT FROM AUTHOR]

Published
2019
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57. [MCU selection analysis in portable electronic medical instrument design]

Author

Mengxing, Liu, Shuming, Ye, Zhi, Xu, and Hang, Chen

Subjects
Equipment Design, Electronics, Medical
Abstract

Around the features of low power and high integration of portable electronic medical equipment design, the primary low power MCU series from the current semiconductor manufacturers were compared. The analysis results showed that the 32-bit MCUs based on the low cost and high energy efficient ARM Cortex-M architectures, have comprehensive advantages on power level, operational performance and integrated peripherals obviously.

Published
2014

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