Doowon Technical University College

With advances in biomedical technology and social changes, such as a high rate of late marriages, the interest in gamete freezing is increasing. Therefore, this study aimed to investigate the status of gamete freezing and reproductive health of adult Koreans aged 19-49 years using data from the 2021 National Family and Fertility survey. The SPSS program was used to analyze the data using descriptive statistics, Fisher's Exact p-value, and the t-test. Of the 14,040 study subjects, 101 (0.7%) had frozen their gametes. The average age of this group was 38.1 years, 61.4% were women and 38.6% were men. In addition, 83.2% of the group had a university degree or higher, 85.1% lived in urban areas, 94.1% were married, and 66.3% were economically active. The participant-reported incidence of genital infections in this group was 29.7%. The obstetric history revealed that 91.9% of the women considered themselves infertile. The results of this study can be used as basic data for developing educational programs to preserve fertility or developing childbirth-related policies in the future.

ObjectivesThis study identifies depressive symptoms and the factors that could explain its presence in breastfeeding people.DesignThis study is a cross-sectional study from national survey data.Setting and participantsData were derived from the 2019 Korean Community Health Survey. The study subjects were breastfeeding people under the age of 50.Primary outcome measuresDepressive symptoms in breastfeeding people were classified according to the Patient Health Questionnaire-9 (PHQ-9) score. Physical and health behaviours were considered as factors related to depressive symptoms. A multilevel logistic regression analysis was used.ResultsAmong 497 participants, 19.4% (n=97) of breastfeeding people were depressed. We found that depressive symptoms were associated with age (31–35, OR: 0.79, 95% CI: 0.67 to 0.94; 35–49, OR: 0.42, 95% CI: 0.32 to 0.56), rural setting (OR: 0.62, 95% CI: 0.51 to 0.76), economic activity (OR: 0.75, 95% CI: 0.61 to 0.91) and physical health (diabetus mellitus or hypertension, OR: 5.17, 95% CI: 3.78 to 7.06).ConclusionsThis study implies that socioeconomic factors, physical health and health behaviours may influence depressive symptoms in breastfeeding people. These findings should be used as descriptive data to support the development of education programmes to help breastfeeding people.

Recently, various bioelectronic nose devices based on human receptors were developed for mimicking a human olfactory system. However, such bioelectronic nose devices could operate in an aqueous solution, and it was often very difficult to detect insoluble gas odorants. Here, we report a portable bioelectronic nose platform utilizing a receptor protein-based bioelectronic nose device as a sensor and odorant-binding protein (OBP) as a transporter for insoluble gas molecules in a solution, mimicking the functionality of human mucosa. Our bioelectronic nose platform based on I7 receptor exhibited dose-dependent responses to octanal gas in real time. Furthermore, the bioelectronic platforms with OBP exhibited the sensor sensitivity improved by ∼100% compared with those without OBP. We also demonstrated the detection of odorant gas from real orange juice and found that the electrical responses of the devices with OBP were much larger than those without OBP. Since our bioelectronic nose platform allows us to directly detect gas-phase odorant molecules including a rather insoluble species, it could be a powerful tool for versatile applications and basic research based on a bioelectronic nose.

The purpose of this research is to figure out various feature of appearance management motive by understanding connection among appearance management motive, pursuit image and make-up behavior from adult women. The age group is between 20-50 age and total 340 adult women were participated in the survey. We analyzed and utilize total 333 answers. We conducted factor analysis, frequency analysis, reliability analysis, cluster analysis by using SPSS 21.0 data analysis method. Make-up behavior is not effected by others’ consciousness of make-up behavior, make-up behavior based on information, similarity evasion type of make-up behavior and trend but effected by pursuit of distinction of make-up behavior, personal relation type of make-up behavior and individual psychological variable. The result is that there is significant difference according to type of appearance management motive. If the research for pursuit image, make-up behavior, make-up purchasing behavior and behavior after purchasing cosmetic according to type of appearance management motive, It would be helpful to understand the relationship between customer psychological variable and customer behavioral variable since make-up behavior is variable affecting cosmetic purchasing behavior and behavior after purchasing cosmetic.

Work–life balance (WLB) is an important concern for all workers irrespective of their age, sex, education level, family structure, or occupation. This study analyzes WLB’s mediating effects and the ease of using WLB programs in the relationship between WLB organizational culture of hotels and turnover intention of its culinary staff. We conducted a survey featuring 320 culinary staff members at hotels in Incheon from 10 to 30 August 2020 and performed statistical analysis using 290 responses. We find that the company’s willingness for WLB, empathetic communication with colleagues, material support of colleagues for WLB, and the ease of using WLB programs in organizational culture had a positive impact on WLB. The company’s willingness for WLB, boss’s consideration for WLB, empathetic communication with colleagues, and material support of colleagues for WLB in organizational culture had a negative impact on turnover intention. The ease of using WLB programs had no indirect effect on the relationship between organizational culture and turnover intention. However, WLB had an indirect effect on the relationship between the four components except for the boss’s consideration for WLB and turnover intention. Hotel management should create an organizational culture that supports the WLB of culinary staff.

This study aims to provide an improved understanding of the local-level spatiotemporal evolution of COVID-19 spread across capital regions of South Korea during the second and third waves of the pandemic (August 2020~June 2021). To explain transmission, we rely upon the local safety level indices along with latent influences from the spatial alignment of municipalities and their serial (temporal) correlation. Utilizing a flexible hierarchical Bayesian model as an analytic operational framework, we exploit the modified BYM (BYM2) model with the Penalized Complexity (PC) priors to account for latent effects (unobserved heterogeneity). The outcome reveals that a municipality with higher population density is likely to have an elevated infection risk, whereas one with good preparedness for infectious disease tends to have a reduction in risk. Furthermore, we identify that including spatial and temporal correlations into the modeling framework significantly improves the performance and explanatory power, justifying our adoption of latent effects. Based on these findings, we present the dynamic evolution of COVID-19 across the Seoul Capital Area (SCA), which helps us verify unique patterns of disease spread as well as regions of elevated risk for further policy intervention and for supporting informed decision making for responding to infectious diseases.

Along with the rapid demographic change, there has been increased attention to the risk of vehicle crashes relative to older drivers. Due to senior involvement and their physical vulnerability, it is crucial to develop models that accurately predict the severity of senior-involved crashes. However, the challenge is how to cope with an imbalanced severity class distribution and the ordered nature of crash severities, as these can complicate the classification of the severity of crashes. In that regard, this study investigates the influence of implementing ordinal nature and handling imbalanced class distribution on the prediction performance. Using vehicle crash data in Ohio, U.S., as an example, the eight machine learning classifiers (logistic and ordered logistic regressions and random forest and ordered random forest with or without handling imbalanced classes) are suggested and then compared with their respective performances. The analysis outcomes show that balancing strategy enhances performance in predicting severe crashes. In contrast, the effects of implementing ordinal nature vary across models. Specifically, the ordered random forest classifier without balancing appears to be superior in terms of overall prediction accuracy, and the ordered random forest with balancing outperforms others in predicting severer crashes.

This paper deals with the starting problem of the conventional V/F control method in case of high speed induction motor using air bearings. The friction torque of air bearings changes according to the bearing state and the operating conditions. And also the initial friction torque is usually larger than that of the conventional bearings. So the starting failure sometimes occurs under the low bearing temperature in case of motor drives using the conventional V/F control based inverter. Therefore this paper suggests a new robust current control assisted V/F control method, which has the starting mode, the transition mode and the conventional V/F control mode. The robust starting mode adopts the current control assisted V/F control method to cope with the starting issues due to the unknown friction torque. And the transition mode provides the smooth voltage transition to the conventional V/F control mode to get the smooth current profile. The simulation and experimental results show the validity and the usefulness of the proposed method.