4 research outputs found
Analysis of Health-Related Behaviors of Adult Korean Women at Normal BMI with Different Body Image Perceptions: Results from the 2013â2017 Korea National Health and Nutrition Examination Survey (KNHNES)
The tendency of misperceiving one’s body image was found to be higher among those at normal body mass index (BMI). Thus, the present study aims to provide basic data to seek solutions for ideal physical activities and right body image perception by comparing health-related behaviors of women at normal BMI. Among the 39,225 respondents from the Korea National Health and Nutrition Examination Survey (KNHNES) conducted from 2013 to 2017, 10,798 adult women with World Health Organization (WHO) BMI Classifications of 18.5 ≤ BMI < 25 (Asia-Pacific) were considered, from which pregnant and breast-feeding women and women whose body image perception was not identified were excluded, leading to a total of 9288 women. Data were analyzed utilizing SAS ver. 9.4 for frequency analysis, cross tabulation, GLM (generalized linear model), and logistic regression analysis with complex samples design, in conformity with the guidelines of the KNHNES. The results showed that approximately most (87.6%) of adult Korean women misperceived their body image. Misperception of body image was related to inappropriate health-related behaviors such as smoking, insufficient sleeping, and excessive body weight management; those who had underestimated their body image (≤64 odds ratio (OR) (0.718 (confidence interval (C.I.) 0.594–0.866))) carried out fewer health-related behaviors, while women aged 65 or above engaged in more health-related behaviors when they perceived themselves as obese (OR 1.683 (C.I. 1.260–2.248; overestimation)). To sum up, it was found that lack of health management, inappropriate body weight control, and health-related behaviors are related to body image misperception compared with real BMI. As such, it is necessary to have educational programs to encourage building proper perception of one’s body image and body weight, and to carry out health-related behaviors
Boosting the Performance of PhotomultiplicationâType Organic Photodiodes by Embedding CsPbBr3 Perovskite Nanocrystals
Abstract In this study, it is demonstrated that CsPbBr3 perovskite nanocrystals (NCs) can enhance the overall performances of photomultiplicationâtype organic photodiodes (PMâOPDs). The proposed approach enables the ionicâpolarizable CsPbBr3 NCs to be evenly distributed throughout the depletion region of Schottky junction interface, allowing the entire trapped electrons within the depletion region to be stabilized, in contrast to previously reported interfaceâlimited strategies. The optimized CsPbBr3âNCâembedded poly(3âhexylthiopheneâdiyl)âbased PMâOPDs exhibit exceptionally high external quantum efficiency, specific detectivity, and gainâbandwidth product of 2,840,000%, 3.97Â ĂÂ 1015 Jones, and 2.14Â ĂÂ 107Â Hz, respectively. 2D grazingâincidence Xâray diffraction analyses and driftâdiffusion simulations combined with temperatureâdependent JâV characteristic analyses are conducted to investigate the physics behind the success of CsPbBr3âNCâembedded PMâOPDs. The results show that the electrostatic interactions generated by the ionic polarization of NCs effectively stabilize the trapped electrons throughout the entire volume of the photoactive layer, thereby successfully increasing the effective energy depth of the trap states and allowing efficient PM mechanisms. This study demonstrates how a hybridâphotoactiveâlayer approach can further enhance PMâOPD when the functionality of inorganic inclusions meets the requirements of the target device
Ultrafast Ambient-Air Exsolution on Metal Oxide via Momentary Photothermal Effect
The process of exsolution for the synthesis of strongly
anchored
metal nanoparticles (NPs) on host oxide lattices has been proposed
as a promising strategy for designing robust catalyst-support composite
systems. However, because conventional exsolution processes occur
in harsh reducing environments at high temperatures for long periods
of time, the choice of support materials and dopant metals are limited
to those with inherently high thermal and chemical stability. Herein,
we report the exsolution of a series of noble metal catalysts (Pt,
Rh, and Ir) from metal oxide nanofibers (WO3 NFs) supports
in an entirely ambient environment induced by intense pulsed light
(IPL)-derived momentary photothermal treatment (>1000 °C).
Since
the exsolution process spans an extremely short period of time (<20
ms), unwanted structural artifacts such as decreased surface area
and phase transition of the support materials are effectively suppressed.
At the same time, exsolved NPs (<5 nm) with uniform size distributions
could successfully be formed. To prove the practical utility of exsolved
catalytic NPs functionalized on WO3 NFs, the chemiresistive
gas sensing characteristics of exsolved Pt-decorated WO3 NFs were analyzed, exhibiting high durability (>200 cyclic exposures),
enhanced response (Rair/Rgas > 800 @ 1 ppm/350 °C), and selectivity toward
H2S target gas. Altogether, we successfully demonstrated
that ultrafast exsolution within a few milliseconds could be induced
in ambient conditions using the IPL-derived momentary photothermal
treatment and contributed to expanding the practical viability of
the exsolution-based synthetic approaches for the production of highly
stable catalyst systems