Back-trajectory analyses for evaluating the transboundary transport effect to the aerosol pollution in South Korea.

This study performed a back-trajectory analysis to determine the influence of transboundary transport on the extent of aerosol pollution in South Korea, based on 5-year PM2.5 measurements (2015-2019) in five cities covering South Korea. A transboundary transport case was selected if a back trajectory passed over a dedicated region (BOX 1 and BOX 2) in the Yellow Sea. First, we found that the frequency of transboundary transport largely increases in the high pollution case, and this pattern is almost consistent for all months and all five cities, indicating the importance of investigating the horizontal direction of air mass movement associated with PM2.5, which has been discussed extensively in previous studies. In this study, we also examined the altitude change and straight moving distance (defined as travel distance) of back trajectories regarding the extent of local PM2.5. Consequently, we found that back trajectories in high aerosol pollution showed much lower altitudes and shorter travel differences, implying a significant contribution of surface emissions and stagnant air conditions to severe aerosol pollution. As a result, the local PM2.5 level was not significantly enhanced when the air mass passed over the Yellow Sea if transboundary transport occurred at high altitudes with rapid movement (i.e., high altitude and long travel distance back-trajectory). Based on these results, we suggest utilizing the combined information of the horizontal direction, altitude variation, and length of back trajectories to better evaluate transboundary transport.

Post-Traumatic Growth of Nurses in COVID-19 Designated Hospitals in Korea.

BACKGROUND: This descriptive survey aimed to identify the factors affecting the post-traumatic growth (PTG) of nurses in COVID-19 designated hospitals on the basis of a PTG model. METHODS: A survey of 250 nurses working at three COVID-19 hospitals in Seoul, South Korea, was conducted from May to July 2021. The collected data were analyzed using the IBM SPSS 25 (IBM Inc., Armonk, NY, USA). RESULTS: The participants in this study were mostly women (92.7%), and the average age and career duration were 32.08 and 7.88 years, respectively. The factors that significantly influenced the participants' PTG were identified as marriage, religion, self-disclosure, deliberate rumination, meaning in life, and resilience. CONCLUSIONS: As new infectious diseases emerge, it is necessary to develop a program that can encourage self-disclosure and deliberate rumination, help nurses discover and pursue meaning in life, and enhance their ability to overcome trauma and promote PTG.

Spiritual needs among Koreans and Americans with advanced chronic illnesses: A cultural comparison.

AIMS AND OBJECTIVES: This study aimed to measure the frequency of spiritual needs, identify the factors associated with these needs among Korean and American persons living with an advance chronic illness and compare them from a cross-cultural perspective. BACKGROUND: Persons with serious or life-limiting illnesses often have spiritual needs. Unmet spiritual needs are associated with poor well-being and threaten psychological health. Little is known about how specific spiritual needs vary across cultures. DESIGN: A quantitative, cross-sectional, observational cross-cultural comparison was undertaken. METHODS: The study has been prepared in accordance with the STROBE guidelines. Convenience sampling was used to recruit participants from outpatient clinics in South Korea and Southern California (N = 202). Spiritual needs were measured using the Spiritual Interests Related to Illness Tool (SpIRIT); demographic and illness-related variables were also assessed using paper-and-pencil questionnaires. Data were analysed using various parametric statistical tests, including multiple regression analysis. RESULTS: The findings quantify the intensity and types of spiritual needs that persons living with an advanced chronic illness experience. Furthermore, they show how the spiritual needs of religiously diverse samples of South Koreans and Americans differ. The findings also indicate that self-reported spirituality and religiosity independently explain a substantial amount of the variance in spiritual needs. CONCLUSIONS: In both the samples, spiritual needs were reported and associated with spirituality and religiosity. Although all the eight domains of spiritual needs assessed by the SpIRIT were pertinent to the Korean and American samples, they were prioritised differently. RELEVANCE TO CLINICAL PRACTICE: Screening patients to ascertain how important spirituality or religiosity is to them may help clinicians focus their in-depth assessments on those who report high levels of spirituality or religiosity because these patients may experience the strongest spiritual needs. The SpIRIT shows promise as a measure of diverse spiritual needs.

Colorless and transparent copolyimide nanocomposites.

Copolyimides (Co-PIs) were synthesized from 2,2'-bis(trifluoromethyl) benzidine (TFB) and different ratios of 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) and pyromellitic dianhydride (PMDA). The Co-PI films were obtained from poly(amic acid) (PAA) by solution-casting through typical chemical and thermal imidizations. The thermal properties and optical transparency of the Co-PI films with various PMDA monomer contents were investigated. It was found that with increasing PMDA content, the thermal transition temperatures of the Co-PI films increased. Co-PI nanocomposites were prepared with various amounts of organically modified hectorite (STN) on a TFB:6FDA:PMDA = 1.0:0.9:0.1 mole ratio Co-PI hybrid film to examine the thermal properties, morphology, and optical transparency. The thermo-optical properties of the Co-PI hybrid films deteriorated with increasing clay content. However, the coefficient of thermal expansion (CTE) and oxygen barrier properties of the PI hybrid films improved with increasing clay content.