87 research outputs found
ENERGY-ENVIRONMENT ISSUE IN TRANSPORT OF VIETNAM
Joint Research on Environmental Science and Technology for the Eart
A Large-Scale Study of a Sleep Tracking and Improving Device with Closed-loop and Personalized Real-time Acoustic Stimulation
Various intervention therapies ranging from pharmaceutical to hi-tech
tailored solutions have been available to treat difficulty in falling asleep
commonly caused by insomnia in modern life. However, current techniques largely
remain ill-suited, ineffective, and unreliable due to their lack of precise
real-time sleep tracking, in-time feedback on the therapies, an ability to keep
people asleep during the night, and a large-scale effectiveness evaluation.
Here, we introduce a novel sleep aid system, called Earable, that can
continuously sense multiple head-based physiological signals and simultaneously
enable closed-loop auditory stimulation to entrain brain activities in time for
effective sleep promotion. We develop the system in a lightweight, comfortable,
and user-friendly headband with a comprehensive set of algorithms and dedicated
own-designed audio stimuli. We conducted multiple protocols from 883 sleep
studies on 377 subjects (241 women, 119 men) wearing either a gold-standard
device (PSG), Earable, or both concurrently. We demonstrate that our system
achieves (1) a strong correlation (0.89 +/- 0.03) between the physiological
signals acquired by Earable and those from the gold-standard PSG, (2) an 87.8
+/- 5.3% agreement on sleep scoring using our automatic real-time sleep staging
algorithm with the consensus scored by three sleep technicians, and (3) a
successful non-pharmacological stimulation alternative to effectively shorten
the duration of sleep falling by 24.1 +/- 0.1 minutes. These results show that
the efficacy of Earable exceeds existing techniques in intentions to promote
fast falling asleep, track sleep state accurately, and achieve high social
acceptance for real-time closed-loop personalized neuromodulation-based home
sleep care.Comment: 33 pages, 8 figure
Application of satellite images and VNREDSAT-1 images in study on marine environment in Truong Sa region
The remote sensing images, including images of MODIS, VNREDSAT-1 and altimeter, are applied for researching marine environment with the different resolutions. On the basis of different time remote sensing images, we concentrated on the assessment of several characteristics including the SST, chlorophyll-a concentration and sea surface current at the different depths in different monsoons as well. With the large areas, we used the images of MODIS and altimeter. The detailed research area focuses on the Nam Yet island, and the images of VNREDSAT-1 are used. The analysis method of environmental parameters of SST and chlorophyll-a used the regression functions based on the single and combined bands to enhance the accuracy of the analysis result. The marine parameters collected at different depths in the latest field surveys on Truong Sa archipelago in the years of 2015 and 2018 are presented in this paper. On the basis of these parameters, we can analyse the relationships and compare the real field survey data and corresponding results interpreted from remote sensing images
Research on marine environment and coral distribution on Nam Yet island using VNRedsat-1 and QuickBird images
Based on the processing of VNRedsat-1 and QuickBird images in the area of Truong Sa archipelago, the research results showed the efficiency of assessing marine environmental characteristics in surroundings of these islands. In this paper, we presented the research results on Nam Yet island and adjacent area. The marine parameters in this research include sea surface temperature (SST) and chlorophyll-a concentration in the surface layer as well as in the deep layers of 20m and 40m, the distributions of the ground objects such as coral shelf, sand accumulation, coral reef combined with seagrass and seaweed. The accuracy of assessment of supervised and unsupervised classified results is approximate of 87.8%. The research results allowed assessing the environmental characteristics, warning of the risk of erosion and coastal line change in the study area
Chemical composition and antibacterial property of Eclipta prostrata (L.) L.
Eclipta prostrata (L.) L. belonging to the Astearaceae family has been long used worldwide by various communities as a traditional medicine. We studied the antibacterial activity of different extracts from Eclipta prostrata (L.) L. against Aeromonas hydrophila, Aeromonas dhakensis, and Vibrio parahaemolyticus . The processing of this extract using repeated column and thin layer chromatographic techniques resulted in the isolation of three compounds including luteolin (1), kaempferol (2), and kaempferol-3-O-α-L-rhamnopyranoside (3), which were identified by NMR. Among them, kaempfreol-3-O-α-L-rhamnopyranoside was isolated for the first time and shows good antibacterial activity against Aeromonas hydrophila which is major pathogen for the aquaculture industry. The results demonstrate the beneficial effects of E. prostrata as an antimicrobial and bioactive compound for medicinal usages.
A comprehensive study on the efficacy of a wearable sleep aid device featuring closed-loop real-time acoustic stimulation
Difficulty falling asleep is one of the typical insomnia symptoms. However, intervention therapies available nowadays, ranging from pharmaceutical to hi-tech tailored solutions, remain ineffective due to their lack of precise real-time sleep tracking, in-time feedback on the therapies, and an ability to keep people asleep during the night. This paper aims to enhance the efficacy of such an intervention by proposing a novel sleep aid system that can sense multiple physiological signals continuously and simultaneously control auditory stimulation to evoke appropriate brain responses for fast sleep promotion. The system, a lightweight, comfortable, and user-friendly headband, employs a comprehensive set of algorithms and dedicated own-designed audio stimuli. Compared to the gold-standard device in 883 sleep studies on 377 subjects, the proposed system achieves (1) a strong correlation (0.89 ± 0.03) between the physiological signals acquired by ours and those from the gold-standard PSG, (2) an 87.8% agreement on automatic sleep scoring with the consensus scored by sleep technicians, and (3) a successful non-pharmacological real-time stimulation to shorten the duration of sleep falling by 24.1 min. Conclusively, our solution exceeds existing ones in promoting fast falling asleep, tracking sleep state accurately, and achieving high social acceptance through a reliable large-scale evaluation
A polyhydroxylated sterol and a saponin isolated from the starfish culcita novaeguineae
Using various chromatographic methods, a polyhydroxylated sterol 5α-cholestane-3β,6β,7α,8β,15α,16β,26-heptol (1) and an asterosaponin sodium salt of 6α-[(O-β-D-fucopyranosyl-(l®2)-O-β-D-galactopyranosyl-(l®4)-O-[β-D-quinovopyranosyl-(l®2)]-O-β-D-xylopyranosyl-(l®3)-O-β-D-quinovopyranosyl)oxy]-5α-pregn-9(11)-ene-20-one (2), were isolated from the methanol extract of the starfish Culcita novaeguineae. Their structures were elucidated by 1D and 2D-NMR experiments and comparison of their NMR data with reported values. Compounds 1 was isolated from         C. novaeguineae for the first time
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