Self-Assembled TaOX/2H-TaS2 as a van der Waals Platform of a Multilevel Memristor Circuit Integrated with a ß-Ga2O3 Transistor.

Two-dimensional (2D)-layered material tantalum disulfide (2H-TaS2) is known to be a van der Waals conductor at room temperature. Here, 2D-layered TaS2 has been partially oxidized by utraviolet-ozone (UV-O3) annealing to form a 12-nm-thin TaOX on conducting TaS2, so that the TaOX/2H-TaS2 structure might be self-assembled. Utilizing the TaOX/2H-TaS2 structure as a platform, each device of a ß-Ga2O3 channel MOSFET and a TaOX memristor has been successfully fabricated. An insulator structure of Pt/TaOX/2H-TaS2 shows good a dielectric constant (k ∼ 21) and strength (∼3 MV/cm) of achieved TaOX, which is enough to support a ß-Ga2O3 transistor channel. Based on the quality of TaOX and low trap density of the TaOX/ß-Ga2O3 interface, which is achieved via another UV-O3 annealing, excellent device properties such as little hysteresis (<∼0.04 V), band-like transport, and a steep subthreshold swing of ∼85 mV/dec are achieved. With a Cu electrode on top of the TaOX/2H-TaS2 structure, the TaOX acts as a memristor operating around ∼2 V for nonvolatile bipolar and unipolar mode memories. The functionalities of the TaOX/2H-TaS2 platform become more distinguished finally when the Cu/TaOX/2H-TaS2 memristor and ß-Ga2O3 MOSFET are integrated to form a resistive memory switching circuit. The circuit nicely demonstrates the multilevel memory functions.

Comorbidity Patterns of Mood Disorders in Adult Inpatients: Applying Association Rule Mining.

This study explored physical and psychiatric comorbidities of mood disorders using association rule mining. There were 7709 subjects who were patients (≥19 years old) diagnosed with mood disorders and included in the data collected by the Korean National Hospital Discharge In-depth Injury Survey (KNHDS) between 2006 and 2018. Physical comorbidities (46.17%) were higher than that of psychiatric comorbidities (27.28%). The frequent comorbidities of mood disorders (F30-F39) were hypertensive diseases (I10-I15), neurotic, stress-related and somatoform disorders (F40-F48), diabetes mellitus (E10-E14), and diseases of esophagus, stomach, and duodenum (K20-K31). The bidirectional association path of mood disorders (F30-F39) with hypertensive diseases (I10-I15) and diabetes mellitus (E10-E14) were the strongest. Depressive episodes (F32) and recurrent depressive disorders (F33) revealed strong bidirectional association paths with other degenerative diseases of the nervous system (G30-G32) and organic, including symptomatic and mental disorders (F00-F09). Bipolar affective disorders (F31) revealed strong bidirectional association paths with diabetes mellitus (E10-E14) and hypertensive diseases (I10-I15). It was found that different physical and psychiatric disorders are comorbid according to the sub-classification of mood disorders. Understanding the comorbidity patterns of major comorbidities for each mood disorder can assist mental health providers in treating and managing patients with mood disorders.

Discovery of Association Rules Patterns and Prevalence of Comorbidities in Adult Patients Hospitalized with Mental and Behavioral Disorders.

The objectives of this study were to identify the prevalence of comorbidities of mental and behavioral disorders and to identify the association rules related to comorbidities as a way to improve patient management efficiently. We extracted comorbidities of 20,690 patients (≥19 years old) whose principal diagnosis was a mental disorder from the Korean National Hospital Discharge In-depth Injury Survey (KNHDS) between 2006 and 2016. Association rules analysis between comorbid diseases using the Apriori algorithm was used. The prevalence of comorbidities in all patients was 61.98%. The frequent comorbidities of mental and behavioral disorders were analyzed in the order of hypertensive diseases (11.06%), mood disorders (8.34%), diabetes mellitus (7.98%), and diseases of esophagus, stomach, and duodenum (7.04%). Nine major association pathways were analyzed. Significant pathways were analyzed as diabetes mellitus and hypertensive diseases (IS scale = 0.386), hypertensive diseases, and cerebrovascular diseases (IS scale = 0.240). The association pathway of diabetes mellitus and hypertensive diseases was common in subgroups of mental and behavioral disorders, excluding mood disorders and disorders of adult personality and behavior. By monitoring related diseases based on major patterns, it can predict comorbid diseases in advance, improve the efficiency of managing patients with mental and behavioral disorders, and furthermore, it can be used to establish related health policies.

Factors Affecting Health-Related Quality of Life in Multimorbidity.

We investigated the effect of predisposing, enabling, need factors, and health behaviors on health-related quality of life (HRQoL) of patients with multimorbidity according to Andersen's model. This study is a secondary analysis of population-based cross-sectional surveys. Data from 328 patients with multimorbidity (≥3 co-occurring chronic diseases) from the 6th/7th Korea National Health and Nutrition Examination Surveys were analyzed using logistic regression. Patients ≥65 years, without private insurance, with poor subjective health, unmet medical needs, and/or limited activity were more likely to experience mobility problems. Self-care problems were more likely among those without private insurance and/or with limited activity. Patients lacking living security, with poor subjective health, limited activity, and/or who smoked were more likely to experience problems performing usual activities. Pain/discomfort was more likely among females, Medicaid beneficiaries, and patients with limited activity and/or with poor subjective health. Patients with poor subjective health, limited activity, and/or unmet medical needs were more likely to experience anxiety/depression. The investigation of HRQoL in multimorbidity should consider predisposing, enabling, need factors, and health behaviors. Interventions addressing movement restrictions and personalized care based on HRQoL domains should be prioritized.

Perceived Barriers to Rural Elderly Women's Health-Promoting Behaviors: An Ecological Perspective.

This study multidimensionally examines rural elderly women's subjective barriers to practicing health-promoting behaviors. Twenty-six rural elderly women participated in three focus group interviews. Content analysis and a qualitative research method were used. The results, based on an ecological model, show that the implementation of health-promoting behaviors in rural elderly women was comprehensively related to intrapersonal (functional decline, passive attitude, and lack of implementation), interpersonal (lack of social support), community (restrictive conditions, accessibility issues, and lack of infrastructure), and public policy (lack of policy support) factors. Interventions addressing each factor can help reduce or eliminate the perceived barriers to health-promoting behaviors through interactions. Our findings can contribute to the development of health-promoting programs focused specifically on the socialization of rural elderly women and community-centered health policies in the future.

Korean Nursing Students' First Experiences of Clinical Practice in Psychiatric Nursing: A Phenomenological Study.

Nursing students have a more negative attitude toward psychiatric practice than other practices. In particular, Korean nursing students experience increased pressure during clinical practice in psychiatric nursing due to sociocultural and institutional influences, such as prejudices, fear, and anxiety towards mental illnesses. This study aimed to conduct an investigation on students' first experiences of clinical practice in psychiatric nursing. Participants were 12 fourth year nursing students in South Korea. The data were collected through semi-structured interviews, and data analysis was done using Colaizzi's phenomenological method. The students' experiences of clinical practice in psychiatric nursing could be categorized into emotional fluctuation, burnout, transformation, and growth. The results of this study show that nursing students experienced emotional fluctuation and burnout at the beginning of their clinical practice in psychiatric nursing. At the end of the clinical practice, they experienced transformation and growth. The study suggests that nursing instructors and on-site staff need to interact with nursing students to understand the nature of these first experiences and support them through teaching and field guidance.

Health literacy, depression, and stress among Chinese immigrants in South Korea.

OBJECTIVES: This study examined health literacy, depression, and stress in Chinese immigrants living in South Korea, and analyzed factors related to these outcomes. DESIGN: This is a cross-sectional, descriptive study. SAMPLE: Participants were 128 adult Chinese immigrants living in the Jung-gu District of Seoul, South Korea. The majority of the participants were women and in their 40s; had a high school diploma; and were employed and married. Most had lived in Korea for 5-10 years. MEASUREMENTS: Outcome variables were health literacy, depression, and immigrant stress; independent variables were sociodemographic characteristics, language proficiency, health, and behavioral factors. Hierarchical multiple regression models based on the conceptual framework were tested. RESULTS: The major factor influencing health literacy was perceived economic status (p = 0.021). The factors related to depression were life satisfaction in China (p = 0.032), life satisfaction in Korea (p = 0.040), and stress perception in everyday life (p = 0.001). CONCLUSIONS: As the number of immigrants rises, there is increasing demand for public-health-center-based health promotion programs for immigrants. It is recommended that local public health practitioners, including public health nurses, closely analyze the characteristics of their community and immigrants, and develop and implement customized programs accordingly.

A predictive model of suicidal ideation in Korean college students.

OBJECTIVE: The study was conducted to develop a theoretical model to comprehensively explain suicidal ideation in Korean college students by including resilience, belongingness, and college life adjustment in addition to depression and stress. DESIGN AND SAMPLE: This study was a descriptive survey with 291 college students. MEASURES: Structural equation modeling was used to the hypotheses on this study. RESULTS: Belongingness and depression showed a statistically significant direct effect, and college life stress and belongingness showed a statistically significant indirect effect. Belongingness was the most influential, and all the predictors in combination had an explanatory power of 37% for suicidal ideation in college students. CONCLUSIONS: Findings suggest a model of suicidal ideation focused on perspective, protective factors; previous research provided a negative perspective with focus on risk factors for suicidal ideation. Findings can be used to develop diverse programs to decrease suicidal ideation in college students and help them to adjust to college life.

Relationships of Mental Health and Internet Use in Korean Adolescents.

AIM: The purpose of this study was to identify the relationships of mental health and internet use in Korean adolescents. Also, it was intended to provide guidelines for reducing internet overuse based on the influencing factors of internet use. METHODS: Participants in this study were convenient sampling, and selected middle and high school students in Incheon metropolitan city, South Korea. Internet use and mental health of adolescents were measured by self-reported instruments. This study was carried out from June to July 2014. 1248 participants were collected overall except for insufficient data. The data were analyzed by descriptive statistics, t-test, ANOVA, Pearson's correlation coefficient, and multiple regression. RESULTS: There were significant correlations between mental health and internet use. The significant influencing factors of internet use were normal internet use group, mental health, middle school, internet using time on weekends (3h or more), internet using time at a time (3h or more), and high school record. These six variables accounted for 38.1% of internet use. CONCLUSIONS: The results of this study will be used as guidelines for reducing internet overuse of adolescents.

Factors Affecting Job Satisfaction of Immigrant Korean Nurses.

PURPOSE: An increasing number of foreign-born nurses are working in the United States. Nurses' job satisfaction is a critical issue for quality patient care. The purpose of this study was to examine factors affecting the job satisfaction of immigrant Korean nurses. DESIGN: We used a cross-sectional mailed survey design. A convenience sample (n = 105) of members of the Greater New York Korean Nurses Association currently working or had previously worked in the United States completed the questionnaires. We used hierarchical regression to test the effects of acculturation and life satisfaction on job satisfaction. RESULTS: Most participants were female (n = 98, 93.3%) aged 27 to 70 years (mean = 52.27 years, SD = 10.67). In the regression model, life satisfaction, self-esteem, and perceived stress predicted job satisfaction (F = 5.127, p < .001) and explained 44.5% of the variance of job satisfaction. DISCUSSION AND CONCLUSION: U.S. nurses need to gain insight into factors influencing job satisfaction in Korean nurses to promote retention and quality care.