South Korea Research Articles

Resurgence of Pertussis in the Gyeongnam Region of South Korea in 2023 and 2024

Background/Objectives: Pertussis continues to pose a substantial global health challenge despite widespread vaccination programs. This study aimed to analyze the epidemiological characteristics of recent pertussis cases in the Gyeongnam region of South Korea. Methods: We analyzed 419 pertussis cases in the Gyeongnam region of South Korea between October 2023 and April 2024, using data collected from epidemiological investigation reports, medical records, and interviews with health officials and school staff. Results: Our analysis revealed a distinct age distribution pattern with minimal cases in infants (0.2% under 1 year) and young children (7.9% in ages 1–6 years), while school-aged children showed the highest incidence (31.8% in ages 7–9 years, 36.0% in ages 10–12 years). The outbreak pattern demonstrated a progressive shift from preschool and elementary school students to middle and high school students. The time from symptoms onset to diagnosis varied significantly across age groups, with a median of 3.0 days (1.0–6.0) overall; notably, this was longer in high school students at 5.0 days (2.3–8.0) (p = 0.023). While 92.4% (365/395) of cases were fully vaccinated, substantial delays were observed in third and fourth dose administration (18.2% and 25.8%, respectively), with considerable timing variability for the fifth and sixth doses. Conclusions: Our findings highlight the changing epidemiology of pertussis in South Korea, characterized by an age shift toward older children. These results emphasize the need for enhanced surveillance focusing on school-aged populations and the reassessment of vaccination strategies, particularly regarding booster dose timings and adherence.

Exploring young children’s self and others: integrating visual diaries and the digital emotional expression application in art education

ABSTRACT This study explores the integration of technology-based and hands-on art practices in an early childhood art education program tailored to preschoolers in South Korea. The participants of this study included 20 young children aged five or six years old, who engaged in the program for a two-year period. By employing qualitative research methods, the results reveal the young learners’ enhanced expression of their emotion, including feelings, desires, and moods with the aid of visual diaries in conjunction with a digital emotional expression application supported by teacher intervention. Further, the young learners were stimulated to engage in self-discovery, self-awareness, and understanding of others. Ultimately, young children’s visual diaries enhanced educators’ and parents’ comprehension of their emotions. Moreover, showcasing these visual diaries and collaborative artwork promoted numerous opportunities for engagement and resonance with the local community. The fusion of visual diaries and the digital emotional expression application is viewed as a practice of emotional meaning making, wherein art and technology agency is distributed.

Prevalence, Characteristics, and Distribution of Human Papillomavirus According to Age and HIV Status in Women of Eastern Cape Province, South Africa

Human papillomavirus (HPV) is a sexually transmitted infection associated with the development of cervical cancer. This study investigated cervical HPV prevalence, characteristics, and distribution according to age and human immunodeficiency virus (HIV) status among women attending a public community health facility in the Eastern Cape Province of South Africa. A total of 325 participants (aged 18 to 60) visiting a community health facility for any reason were recruited. Cervical HPV infection was detected using the Seegene Anyplex™ II HPV28 assay (Seegene Inc., Seoul, South Korea). Overall HPV prevalence was 65.2% (95% CI: 59.9–70.2%), with the highest prevalence of 80.9% (95% CI: 67.2–89.8%) observed in the 18–25-year-old age group and the lowest prevalence of 46.3% (95% CI: 35.8–57.1%) in the 46–60-year-old age group. HR-HPV infection was found to decrease with increasing age (p < 0.001) in the overall population and according to HIV status. In contrast, LR-HPV infection was found to significantly decrease with age among HIV-negative women (p = 0.001) but not for the overall population and HIV-positive women. A proportion of 12.9% were infected with one or more HPV types covered by the Cervarix® HPV vaccine (HPV-16 and/or -18), 18.8% (by those covered by Gardasil®4 (HPV-6, -11, -16 and/or -18), and 42.2% by those covered by Gardasil®9 (HPV-6, -11, -16, -18, -31, -33, -45, -52 and/or -58). The alpha-9 HPV species was the most dominant species (40.6%), followed by the alpha-7 species (29.8%). High overall HPV, HR-HPV, and alpha-9 species prevalence were observed among the women attending the public health facility. These findings contribute to the limited HPV distribution data among the Eastern Cape women, which could be used to improve HPV-related policy and assess the effectiveness of the HPV vaccination.

Influence of Health Literacy on Physical Activity and Sedentary Behaviors in Older Patients with Coronary Artery Disease.

Coronary artery disease is a chronic condition that requires continuous adherence to healthy behaviors. Adhering to physical activity and reducing prolonged sedentary behavior are important for the physical health of older patients with coronary artery disease (CAD). Health literacy is increasingly recognized as a key factor in secondary prevention for these patients. However, evidence regarding the associations among health literacy, physical activity, and sedentary behaviors for secondary prevention in older patients with coronary artery disease remains limited. This study aimed to identify the prevalence of limited health literacy and the influence of health literacy on physical activity and sedentary behaviors in older patients with CAD. This study was a descriptive cross-sectional study conducted from May to December 2022 in South Korea. A total of 186 patients aged 65 and older diagnosed with coronary artery disease participated. Data on health literacy, physical activity, and sedentary behaviors were collected through self-reported questionnaires and electronic medical records. The prevalence of limited health literacy in older patients was 66.7%. Hierarchical linear regression revealed that health literacy was a significant determinant of physical activity (β = -0.50, P < .001) and sedentary behaviors (β = 0.58, P < .001) after adjusting for confounding variables. Our main findings showed that health literacy can facilitate improvements in physical activity and sedentary behaviors. Health literacy can facilitate health decisions for secondary prevention in older patients with CAD. Thus, healthcare professionals should assess patient health literacy and illness severity when designing secondary prevention programs.

Long-Term Ozone Exposure, COPD, and Asthma Mortality: A Retrospective Cohort Study in the Republic of Korea

Ozone concentrations have increased in recent decades, and several studies have reported that long-term exposure to ozone increases the mortality risk induced by respiratory conditions. However, research on cause-specific mortality related to ozone exposure and respiratory diseases remains scarce. We constructed a retrospective cohort of 5,360,032 adults aged ≥ 65 years from the National Health Insurance Service of Republic of Korea, and death certificates were obtained from Statistics Republic of Korea to determine the cause of death between 2010 and 2019. The daily maximum 8 h average levels of ozone during the warm season annually (May–September) and other air pollutants were determined for the residential district. We analyzed the data using a time-varying Cox proportional hazards model with individual- and district-level covariates, incorporating a competing risk framework to address deaths from causes other than chronic obstructive pulmonary disease (COPD) and asthma. In our single-pollutant model with a 3-year moving average, a 1 ppb increase in ozone exposure was associated with a hazard ratio (HR) of 1.011 (95% confidence interval [CI]: 1.008–1.013) for COPD mortality and an HR of 1.016 (95% CI: 1.011–1.022) for asthma mortality. In our model adjusted for the presence of underlying diseases and district-level variables, the HRs were 1.009 (95% CI: 1.008–1.014) for COPD and 1.017 (95% CI: 1.011–1.023) for asthma, respectively. These associations remained robust in our two-pollutant model, except for NO2 and COPD. A linear concentration–response relationship was identified between ozone concentration, COPD, and asthma mortality. In this large nationwide cohort study, long-term exposure to ozone was associated with an increased risk of death from COPD and asthma in older Korean adults.

An Assessment of the Carbon Budget of the Passively Restored Willow Forests Along the Miho River, Central South Korea

Climate change is rapidly progressing as the carbon budget balance is broken due to excessive energy and land use. This study was conducted to find and quantify new carbon sinks to implement the carbon neutrality policy prepared by the international community to solve these problems. To reach this goal, an allometric equation of the willow community, which dominates riparian vegetation, was developed and applied to calculate the net primary productivity of the willow community. Furthermore, after the amount of carbon emitted via soil respiration was quantified, the net ecosystem production was calculated by subtracting the amount of soil respiration from the net primary productivity. In comparisons of the results obtained via this process with those obtained from forest vegetation, the willow community, representative of riparian vegetation, showed a much higher carbon sequestration rate than forest vegetation. Considering these results comprehensively, the willow community could be a new and significant carbon absorption source. In this context, proper river restoration should be realized to contribute to carbon neutrality and secure various ecosystem service functions.

The public and private mix in the production of childcare: a case study of 21st century South Korea

Purpose The aim of this study is to demonstrate the usefulness of the “publicness” and “privateness” concepts in examining childcare policy reforms. Understanding them as having multiple facets, this paper challenges the way in which childcare-going-public is often simply assessed based on the coverage of publicly-funded childcare services. Instead, it highlights that the process should be more thoroughly examined by considering who pays for whom to provide childcare, where it takes place, how it is regulated, and what kinds of normative ideals it works towards.Design/methodology/approach The research design is two-fold. Firstly, it coins the concepts of “publicness” and “privateness” based on existing literature on welfare pluralism and public administration. It then unpacks the key facets constituting this conceptual twin within the childcare context, which are utilised to craft four models of childcare production. Secondly, this framework is analytically applied to explore 21st-century South Korea to track the changes and continuities in its childcare production models across four governments.Findings The analysis shows that while South Korea's childcare publicness increased in terms of funding, its privateness was bolstered in regard to the location of childcare, the way that publicly-funded childcare services were regulated and delivered, and the manner in which childcare was partially consolidated as a familial responsibility.Originality/value This paper proposes a new conceptual framework to analyse the complex and multi-layered process of how childcare goes public, which is analytically applied to a cross-governmental comparative study of South Korea.

Observations on China's Educational Discipline Policies: Taking Japan and South Korea's Educational Discipline as a Reference

Educational discipline refers to the process of educational behavior to stop and eliminate students' misbehavior, to help students correct their mistakes for the purpose of punishment as a characteristic of a form of education. The study analyzes the current situation of Educational discipline in China and its shortcomings, categorizes and analyzes the abuse of Educational discipline in China, the lack of use of Educational discipline, and the blurring of the concepts of Educational discipline and corporal punishment, punishment, and so on. At the same time, the study analyzes the policies related to Educational discipline in Japan and South Korea, and puts forward suggestions for the future development of China's Educational discipline policy and the problems that need to be avoided through the clear breakdown of the rules of corporal punishment in Japan and the infringement of the right to Educational discipline in South Korea due to the Human Rights of Students Ordinance.

A Comparative Study of the Design of East Asian Royal Gardens

The current research methods employed in the study of gardens are largely concentrated in the fields of landscape architecture, architecture, and ecology. However, there is a paucity of analytical methods dedicated to the domain of garden design. However, the design content of gardens is within the scope of design studies. It is therefore imperative to develop or refine research methods for the analysis of gardens that are firmly grounded in design principles. The primary contribution of this study is the development of a design analysis framework, centered on the interrelationships between ‘user–garden–environment’, which can be applied to the analysis and investigation of gardens from a ‘people, objects, and environment’ perspective, in alignment with design studies. Influenced by similar geography, environment, culture, customs, etc., the garden design of China, Japan, and South Korea presents a very East Asian design style of forms, elements, features, etc., but also formed the differences of each characteristic. This paper takes China’s Chengde Mountain Resort, Japan’s Shugakuin Imperial Villa, and South Korea’s Changdeokgung, which are listed on the World Heritage List, as examples Based on the design analysis method proposed in this paper, a relevant design comparative study is conducted in three aspects: users of East Asia’s royal gardens, the design object—the gardens—and the external environment, and the similarities and differences between the Chinese, Japanese, and Korean royal gardens are analyzed. This study aims to verify the feasibility of the analytical framework of ‘user–garden–environment’ design by analyzing typical cases of royal gardens in China, Japan, and South Korea. This will enable the creation of multiple values conducive to the development of gardens. Furthermore, the analytical framework of ‘user–garden–environment’ is subjected to a process of deconstruction through the case studies of typical royal gardens in the three East Asian countries. This is done to overcome the limitations of existing research methodologies, provide a novel systematic research methodology for garden research, and facilitate the protection and inheritance of the historical and cultural heritage of gardens in East Asia. Additionally, this approach offers a reference point for related garden research in the context of modern lifestyles.

The Association Between Victimization and Perpetration of Physical Intimate Partner Violence and Unmet Healthcare Needs Among Married Women in South Korea.

This study assessed physical intimate partner violence (IPV) experiences and examined their association with unmet healthcare needs among married women in South Korea. We analyzed data from a nationally representative longitudinal survey of 6,533 women at baseline. Participants were asked yes/no questions about their experiences of physical IPV victimization and perpetration over the past year. The responses were classified into four categories of IPV experience: "none," "victimization only," "perpetration only," and "both victimization and perpetration." At baseline, 0.9% reported being victimized only, and 25.9% reported both victimization and perpetration. The prevalence of unmet healthcare needs over the past year at baseline was 0.8%. Compared to women without any IPV experience, women in the IPV "victimization only" category had greater unmet healthcare needs (OR: 5.49, 95% CI [2.30, 13.12]) after adjusting for sociodemographic variables. Experiencing IPV perpetration only and both IPV victimization and perpetration were not statistically significantly associated with unmet healthcare needs. These results imply that physical IPV victims face difficulties accessing healthcare services which could exacerbate health inequalities over time. Moreover, this study suggests that it is necessary to distinguish IPV victims from those who experience IPV victimization only and those who experience both IPV victimization and perpetration.

Comparing road traffic injuries by types of road users among children and adolescents in South Korea, 2011–2021

IntroductionRoad traffic injuries (RTIs) are the leading cause of mortality among children and adolescents. This study aimed to compare clinical characteristics and identify factors associated with severe RTIs based on...

Non-Targeted Screening and Identification of the Transformation Pathway of Carbamazepine in the Saemangeum Watershed, Republic of Korea

Non-Targeted Screening and Identification of the Transformation Pathway of Carbamazepine in the Saemangeum Watershed, Republic of Korea

Effects of antipsychotic drugs during radiotherapy in breast cancer in South Korea: a retrospective cohort study

In this study, we aimed to investigate the nationwide utilization of antipsychotic drugs (APDs) during radiotherapy and evaluate their association with survival in patients with breast cancer. This retrospective cohort study used the National Health Insurance Service database in Korea and included patients diagnosed with breast cancer from 2010 to 2020 who received radiotherapy. The APDs included in the analysis were aripiprazole, quetiapine, olanzapine, risperidone, haloperidol, and chlorpromazine, and the APD prescription details included prescription time, dosage, and duration. Among 170,226 patients with breast cancer treated with radiotherapy, 3361 (1.97%) received APD during radiotherapy. Use of APDs was significantly associated with higher mortality in all patients and in a subgroup of patients excluding those with metastasis or other cancers. Among patients taking APD during radiotherapy, those with accompanied psychiatric history and long-term APD use for ≥ 3 months were associated with lower mortality, whereas patients who started APD during radiotherapy had higher mortality than those who started APD before radiotherapy. The high mortality observed in breast cancer patients using APDs during radiotherapy could be influenced by the underlying conditions that necessitated APD use. Further studies are needed to determine the effects of APDs during radiotherapy in patients with breast cancer.

The economic and psychological impacts of covid-19: a exploratory study of the intersection of traditional and new vulnerable groups in South Korea

BackgroundThe global impact of the COVID-19 pandemic has been extensive, disproportionately affecting various vulnerable populations. In addition to traditional vulnerable groups (TVGs) such as the elderly, women, people with lower education, disabled individuals, and low-income groups, new vulnerable groups (NVGs) have emerged, including essential workers, face-to-face workers, temporary workers, and the self-employed. This study focuses on exploring the economic and psychological effects of the pandemic on both traditional and newly recognized vulnerable groups within Korea.MethodsThe study employed multiple logistic regression using micro-level social survey data from Statistics Korea to calculate the odds ratio relating to two categories of vulnerable groups and their economic and mental health impacts. Additionally, through interaction term analysis, we tried to uncover the complex interrelationship between these non-vulnerable groups and target vulnerable groups.ResultsBoth the newly identified and traditional vulnerable groups showed higher likelihood of facing economic and mental health challenges compared to non-vulnerable groups. The likelihood of encountering a decrease in income and work-related stress was 2.17 times higher (95% CI = 1.90–2.47) for NVGs, while those belonging to TVGs had a 1.75-fold increase (95% CI = 1.47–2.08). Moreover, female self-employed workers faced higher overall stress at 1.36 times greater risk (95% CI = 1.08–1.71), whereas elderly individuals who are self-employed exhibited lower odds of experiencing such stress at the intersection between TVGs and NVGs.ConclusionThis research offers in-depth understanding of the diverse impacts of COVID-19 on at-risk groups. Furthermore, examinations that take into account interactions between NVGs and TVGs uncovered subtle effects within subgroup dynamics, suggesting that intersecting factors play a role in different levels of vulnerability. This provides valuable evidence for informing policy decisions and allocating resources.

Taxonomic Identification of Ligustrum foliosum Nakai: A Comprehensive Study of Macro- and Micromorphology.

Ligustrum foliosum Nakai, a species endemic to South Korea, is a member of the Oleaceae family. This study provides a comprehensive taxonomic identification of L. foliosum based on its macro- and micromorphological characteristics, particularly focusing on the leaf foliar epidermal taxonomy. Scanning electron microscopy (SEM) was used to analyze the leaf structures of L. foliosum collected from various populations on Ulleungdo Island, its primary habitat. Macromorphological assessment revealed that L. foliosum exhibits ovate to elliptical leaves with pointed apices, rounded bases, and entire, smooth margins. The leaves measured 3-10 cm in length and 1.5-4 cm in width, with a pinnate venation pattern and prominent secondary veins. The adaxial surface was dark green and glabrous, while the adaxial surface was lighter green and slightly pubescent. Micromorphological analysis using SEM provided detailed insights into the leaf epidermal characteristics. The epidermal cells were polygonal in shape with straight to slightly curved anticlinal walls. Anomocytic stomata that were not surrounded by specialized cells are the predominant type, with a density ranging from 100 to 150/mm2. Epidermal cells measured approximately 10-20 μm in length and 5-10 μm in width, while the stomata typically measured approximately 20-30 μm in length and 10-15 μm in width. Thick-walled bundle sheath cells were evident around the vascular bundles, with a density of 1-3 bundles/mm. The cuticle was moderately thick, providing protection against desiccation, and trichomes were elongated single cell on the leaf both surface. This study contributes to the understanding of L. foliosum's taxonomic position within the Oleaceae family by providing a detailed description of its macro- and micromorphological characteristics. These findings can aid in the identification and conservation of this endemic species, which is crucial for preserving the unique biodiversity of Ulleungdo Island and South Korea.

Elite Politics, Mass Discontent and Political Inequality in South Korea: Who Represents Me?

In an era of heightened public skepticism toward political institutions, understanding the perceived divide between political elites and the general population has become increasingly essential. This study examines how Korean citizens perceive their political representatives, focusing on the socio-economic and demographic disparities between political elites and the wider public. To achieve this, this study concentrates on three core elements: citizens’ perceptions of politicians, the social networks of elite politicians, and the socio-economic and demographic attributes of these elites in comparison to the general population. Employing a data-driven approach—including text analysis, clustering, social network analysis, and visualization techniques—this study investigates data on political elites alongside district-level data. The findings reveal significant socio-economic and demographic disparities between political elites and the public, with elites predominantly emerging from narrow backgrounds characterized by affluence, high education, and an overrepresentation of males above the age of 60. These results underscore the need for measures that promote transparency, accountability, and inclusivity within the political system, highlighting the importance of bridging the divide between political elites and the general public to cultivate a more representative and responsive political environment.

Book review: Gi-Wook Shin and Ho-Ki Kim (Eds.), South Korea’s Democracy in Crisis: The Threats of Illiberalism, Populism and Polarization

Gi-Wook Shin and Ho-Ki Kim (Eds.), South Korea’s Democracy in Crisis: The Threats of Illiberalism, Populism and Polarization (Stanford: Walter H. Shorenstein Asia-Pacific Research Center, 2022), pp. 451, $9.99. ISBN 978-1-931368-71-1 (ebook)

Why I Choose This Sticker When Chatting with You: Exploring Design Considerations for Sticker Recommendation Services in Mobile Instant Messengers

Nowadays, many mobile instant messenger (MIM) users employ stickers to express their emotions. Due to the increase in the variety of stickers, many MIM platforms have begun to offer sticker recommendation services, which suggest appropriate stickers based on the context of conversations. Although sticker recommendation services need to consider users' subtle social and psychological needs from the perspective that stickers are an alternative communication language, few attempts have been made to explore this area. Consequently, we investigated sticker usage practices through a qualitative study with 18 KakaoTalk users in South Korea. Based on the results of this study, we revealed user's three common considerations in sticker usage experiences and discussed the design implications for sticker recommendation services in MIM.

First record of Epeurysadistincta Huang & Ding (Hemiptera, Delphacidae, Delphacinae) from South Korea, with an illustrated key to the Korean Tropidocephalini species.

The tribe Tropidocephalini is the second largest tribe of the subfamily Delphacinae, comprising 204 species of 37 genera worldwide. Most species in this tribe feed on bamboo (Bambusoideae) or grasses (Poaceae). In Korea, only three species have been reported. This tribe is represented by four species in South Korea, including a newly-recorded species, Epeurysadistincta Huang & Ding, 1979. Descriptions and illustrations of the four species and a revised key for the identification of the tribe Tropidocephalini are provided.

Perceptions of inequality and loneliness as drivers of social unraveling: Evidence from South Korea.

This study investigates the relationship between perceptions of inequality, feelings of loneliness, and societal fragmentation in South Korea, focusing on their interconnected dynamics. The research emphasizes the social contexts in which loneliness emerges and exerts its influence. In the first phase, path analysis is employed to examine how perceived inequality contributes to societal fragmentation-manifested through disbelief, exploitation, and indifference-with loneliness serving as a mediating factor. The findings reveal a significant link between perceived inequality and loneliness, which, in turn, undermines social cohesion. The second phase delves deeper into this relationship by analyzing each regression model, further substantiating the connection between perceived inequality and loneliness and its role in shaping perceptions of societal fragmentation. In an era marked by rising economic inequality and democratic erosion, loneliness extends beyond an individual concern, posing broader implications for societal emotional health. The study underscores the urgent need for interventions aimed at reducing economic inequality and addressing loneliness to promote more cohesive societies.