South Korea Research Articles

Polyphasic Investigation of Aliiroseovarius salicola sp. nov., Isolated from Seawater.

A novel Gram-stain-negative, strictly aerobic, short-rod-shaped, and chemo-organoheterotrophic bacterium, designated KMU-50T, was isolated from seawater gathered from Dadaepo Harbor in South Korea. The microorganism grew at 0-4.0% NaCl concentrations (w/v), pH 6.0-8.0, and 4-37°C. The 16S rRNA gene sequence-based phylogenetic tree demonstrated that the strain KMU-50T is a novel member of the family Roseobacteraceae and were greatly related to Aliiroseovarius crassostreae CV919-312T with sequence similarity of 98.3%. C18:1 ω7c was the main fatty acid and ubiquinone-10 was the only isoprenoid quinone. The dominant polar lipids were phosphatidylglycerol, diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylcholine, two unidentified phospholipids, an unidentified aminolipid, and an unidentified lipid. The genome size of strain KMU-50T was 3.60 Mbp with a DNA G+C content of 56.0%. The average nucleotide identity (ANI) and average amino acid identity (AAI) values between the genomes of strain KMU-50T and its closely related species were 76.0-81.2% and 62.2-81.5%, respectively. The digital DNA-DNA hybridization (dDDH) value of strain KMU-50T with the strain of A. crassostreae CV919-312T was 25.1%. The genome of the strain KMU-50T showed that it encoded many genes involved in the breakdown of bio-macromolecules, thus showing a high potential as a producer of industrially useful enzymes. Consequently, the strain is described as a new species in the genus Aliiroseovarius, for which the name Aliiroseovarius salicola sp. nov., is proposed with the type strain KMU-50T (= KCCM 90480T = NBRC 115482T).

Possible Ways to Help Raise China's Fertility Rate

This paper explores the reasons why the current problem of fertility reduction in China is mainly due to the unclear future family planning of women and young people and the incomplete inclusion of the responsibility of raising children in their future planning. By comparing the three types of countries in the world - backward countries, developing countries and developed countries - as "three small islands" and comparing the welfare they provide to their citizens, as well as their demands for different productive forces and human resources, we gradually determine the orientation of China and its future development direction. Finally, by citing and learning from the fertility policies of Japan and South Korea, the article gives several feasible plans to help China raise its fertility rate. With mild encouragement and some financial support, young families can be helped to settle down in their plans to start a family.

Machine Learning-Based Prediction of Suicidal Thinking in Adolescents by Derivation and Validation in 3 Independent Worldwide Cohorts: Algorithm Development and Validation Study.

Suicide is the second-leading cause of death among adolescents and is associated with clusters of suicides. Despite numerous studies on this preventable cause of death, the focus has primarily been on single nations and traditional statistical methods. This study aims to develop a predictive model for adolescent suicidal thinking using multinational data sets and machine learning (ML). We used data from the Korea Youth Risk Behavior Web-based Survey with 566,875 adolescents aged between 13 and 18 years and conducted external validation using the Youth Risk Behavior Survey with 103,874 adolescents and Norway's University National General Survey with 19,574 adolescents. Several tree-based ML models were developed, and feature importance and Shapley additive explanations values were analyzed to identify risk factors for adolescent suicidal thinking. When trained on the Korea Youth Risk Behavior Web-based Survey data from South Korea with a 95% CI, the XGBoost model reported an area under the receiver operating characteristic (AUROC) curve of 90.06% (95% CI 89.97-90.16), displaying superior performance compared to other models. For external validation using the Youth Risk Behavior Survey data from the United States and the University National General Survey from Norway, the XGBoost model achieved AUROCs of 83.09% and 81.27%, respectively. Across all data sets, XGBoost consistently outperformed the other models with the highest AUROC score, and was selected as the optimal model. In terms of predictors of suicidal thinking, feelings of sadness and despair were the most influential, accounting for 57.4% of the impact, followed by stress status at 19.8%. This was followed by age (5.7%), household income (4%), academic achievement (3.4%), sex (2.1%), and others, which contributed less than 2% each. This study used ML by integrating diverse data sets from 3 countries to address adolescent suicide. The findings highlight the important role of emotional health indicators in predicting suicidal thinking among adolescents. Specifically, sadness and despair were identified as the most significant predictors, followed by stressful conditions and age. These findings emphasize the critical need for early diagnosis and prevention of mental health issues during adolescence.

Public Confidence Attitude Formation Toward the Police in Japan, South Korea, and Taiwan: Similarities and Differences

Public Confidence Attitude Formation Toward the Police in Japan, South Korea, and Taiwan: Similarities and Differences

Analysis of the Role of Cosmetic Dermatology in Improving the Quality of Life of Patients with Vitiligo: Observational Study at Busan Hospital, South Korea

Introduction: Vitiligo is an autoimmune disease that causes skin depigmentation. This can have a significant impact on the patient's quality of life. Dermatological cosmetics can be used to cover depigmented areas and improve the patient's quality of life. Methods: This observational study was conducted on vitiligo patients treated at Busan Hospital, South Korea. Patients were given a questionnaire to assess their quality of life before and after using dermatology cosmetics. A total of 250 research subjects took part in this study. Data were analyzed using appropriate statistical tests. Results: The results showed that the use of dermatological cosmetics significantly improved the quality of life of vitiligo patients. Patients report improvements in self-satisfaction, self-image, and social interactions. Conclusion: Cosmetic dermatology is a safe and effective therapeutic option to improve the quality of life of vitiligo patients.

Efficacy and safety of netupitant/palonosetron in preventing nausea and vomiting in diffuse large B cell lymphoma patients undergoing R–CHOP chemotherapy

Diffuse large B-cell lymphoma (DLBCL) is the most common type of non-Hodgkin’s lymphoma, for which cyclophosphamide, doxorubicin, vincristine, and prednisone with rituximab(R–CHOP) is one of the standard regimens. Given that R–CHOP is highly emetogenic, chemotherapy-induced nausea and vomiting (CINV) prevention is clinically important. However, there is a paucity of studies focusing on these patients. This study aimed to ascertain the effectiveness of an oral fixed-dose combination of netupitant and palonosetron (NEPA) in preventing CINV in patients with DLBCL undergoing first-line R-CHOP chemotherapy. Seventy patients were enrolled in this single-center prospective non-comparative study conducted between November 2020 and May 2023 in South Korea. NEPA was administered 1 h prior to chemotherapy initiation on day 1. The primary endpoint of the study was the complete response rate (no emesis, and no rescue medication) during the acute, delayed, and overall phases, which were assessed over a period of 120 h post-chemotherapy. The complete response rates for NEPA were 90.0% [95% CI 80.5, 95.9] for the acute phase, 85.7% [95% CI 75.3, 92.9] for the delayed phase, and 84.3% [95% CI 73.6, 91.9] for the overall phase, with no-emesis rates (acute: 97.1% [95% CI 97.1, 99.7], delayed: 95.7% [95% CI 88.0, 99.1], overall: 92.9% [95% CI 84.1, 97.6]). NEPA was well tolerated with no severe treatment-emergent adverse events. NEPA exhibited substantial efficacy in mitigating CINV in DLBCL patients undergoing R–CHOP chemotherapy, demonstrating high CR and no-emesis rates, and favorable safety profiles.

The changes in biethnic acceptance across daily settings and biethnic adolescents' psychological well-being during middle school transition.

Patterns of biethnic adolescents' perceived biethnic acceptance across families, peers, and school contexts were examined during the transition from elementary to middle school in South Korea. We also examined how the transition patterns were related to their psychological outcomes during this period. Utilizing 2-wave data (2017 and 2019) from the Panel Survey of Korean Multicultural Youth Adjustment, a latent transition analysis was conducted. Participants were biethnic adolescents who were in 5th or 6th grade at Wave 1 (N = 245; 51.02% female; Mage = 11.38). Their fathers were Korean, and mothers were immigrants from neighboring countries. Familial ethnic socialization, peer discrimination, and school multicultural climate scores were used as indicators of biethnic acceptance. Outcomes of self-esteem, depression, and biethnic affirmation were also examined. Latent profile and transition analyses yielded two groups (i.e., high acceptance and low acceptance) at each wave and four transition patterns (i.e., high-high, low-high, low-low, and high-low). Compared to high-high group, which was the most prevalent group, low-low and high-low groups reported lower self-esteem and ethnic affirmation, and greater depression at Wave 3. While for the majority of participants, their daily settings continued to be high in biethnic acceptance across the transition period, most at risk were those who perceived a decrease in biethnic acceptance in their daily settings. Results shed light on the need for support to maintain the context of high biethnic acceptance surrounding biethnic adolescents for their psychological well-being in school transitions.

Cultural institutions as knowledge-intensive public organisations (KIPOs) and their role: how digitalisation can change them providing sustainable and accessible public services

PurposeThis exploratory research seeks to clarify the role of cultural organisations as knowledge-intensive public organisations (KIPOs) and the trend of digital content creation in museum sectors and national strategies through a country case study. It aims to provide a deeper understanding and analysis of museums' roles as KIPOs, specifically focusing on their digitalisation and digital content development for service delivery. Digital technology utilisation in the museum sector has amplified the significance of digital content, not only because of the increasing use of digital technologies among the public but also because it provides attractive new content to appeal to customers, as well as more efficient knowledge management and knowledge reproduction tools for KIPOs. Thus, this paper analyses digital content creation in the museum sector and policy frameworks to provide insights into the role of museums as KIPOs by utilising digital technologies.Design/methodology/approachWe conducted literature review on six keywords, combination of “cultural institution”, “museum”, “digitalization”, “digital content”, and “ICT” to understand the digitalisation of museums amongst academic papers, then used a case study to figure out the common issues as well as case-specific features of these digital offerings through analysis of the digital platforms of museums. Specifically, we choose the case of South Korea, its national strategies and budget allocations and the museum sectors in the country. Thus, the secondary data analysis was provided by the official channels, such as documents from government agencies, media sources, such as articles from newspapers and magazines and academic works of literature, such as papers in scientific journals.FindingsThis paper reveals the research trend in museums' digitalisation, especially through the case study, how the South Korean government has argued digital content development in museum sectors through their national strategies and budget allocations, and the trend of museums' digital offerings since 2021. This paper thus presents a novel contribution to the field by delving into the research trend in digitalisation and digital content development in the museum sector and analysing the South Korean government's national strategies and budget allocation in this context. The literature review shows that the digitalisation of museums has increased research interest in the last few years in limited areas. South Korea has allocated budgets and policies to encourage digital content creation in museums, and this study identifies an increase in digital content creation in the museum sector.Research limitations/implicationsThe paper chose one-country case study, that of South Korea; thus, there are representative limitations and thus in terms of generalisation of the results. Further research with case studies from other countries and comparative studies are required.Practical implicationsThis study highlights the importance of digitalisation and digital content development in the museum sector through government policies, strategies and financial investment.Social implicationsIt highlights the importance of digitalisation and the introduction of digital contents amongst museums to gain new visitors and change the relationship between the institutions and the customers.Originality/valueIt deals with the digitalisation of museums as KIPOs and it is a new and relevant topic per se. This study enhances the understanding of the museum sector’s digital content development and national policies to support its activities. It provides insights into the utilisation of digital technologies in cultural institutions for digital service delivery in public organisations.

Injured and Ashamed: The Limitation of the Expanded Coercion-Based Rape Model in South Korea

Rape is a form of gender-based violence in which the line between coercion and consent is frequently blurred or contested. What happens when a court system broadens its definition of rape to include a broader range of coercive and potentially nonconsensual behaviors? In recent decades, South Korean courts have shifted the scope of coercion required for rape convictions, expanding from direct to indirect force to cover a broader range of rape cases. In this article, I investigate what has and has not changed with the expanded definition of coercion, through quantitative and qualitative analysis of 872 South Korean court decisions between 2013 and 2020. The analysis demonstrates that, despite a broader definition of coercion, the coercion-based rape model reinforces gender hierarchy by depicting the victim as the one who is supposed to be severely injured and ashamed in order to be believed. This study contributes to a better understanding of what we lose when femininity is defined by vulnerability, and it also engages the global debate over coercion-based versus consent-based legal models for rape adjudications.

Neighbourhood watch: the future of Asian LNG demand growth

The global liquefied natural gas (LNG) market has returned to a semblance of calm after a tumultuous 2022. European and Chinese demand is on the path to a slow recovery, while a nuclear power renaissance is underway in Japan and South Korea. This paper will detail our expectations for LNG demand growth, discuss demand drivers and market development opportunities for Australian LNG between the late 2020s to early 2030s. We see LNG demand in the region increasing from 260 Mtpa in 2023 to 479 Mtpa by 2035. The largest source of growth continues to be China with demand growing from 68 to 150 Mtpa, driven by uptake of LNG in the industrial and buildings sectors. We will also see South Asian demand growing from 33 to 100 Mtpa, and Southeast Asian demand from 24 to 103 Mtpa. Even in legacy markets of Japan and Korea where we see demand declining in this timeframe, we will see the emergence of new buyers and the impact of market liberalisation measures. The expiry of legacy contracts and the rising influence of US LNG is set to complicate market dynamics further. We discuss the challenges of the energy transition in a region that must balance emissions considerations with energy demand. We conclude that Australian projects with their proximate location and legacy relationships will remain an attractive proposition for Asian buyers. Ullage at existing LNG plants will support backfill economics, with decarbonisation measures taken under the Safeguard Mechanism demonstrating genuine emissions reduction action.

Temperature extremes nip invasive macrophyte Cabomba caroliniana A. Gray in the bud: potential geographic distributions and risk assessment based on future climate change and anthropogenic influences

Cabomba caroliniana A. Gray, an ornamental submerged plant indigenous to tropical America, has been introduced to numerous countries in Europe, Asia, and Oceania, impacting native aquatic ecosystems. Given this species is a popular aquarium plant and widely traded, there is a high risk of introduction and invasion into other environments. In the current study the potential global geographic distribution of C. caroliniana was predicted under the effects of climate change and human influence in an optimised MaxEnt model. The model used rigorously screened occurrence records of C. caroliniana from hydro informatic datasets and 20 associated influencing factors. The findings indicate that temperature and human-mediated activities significantly influenced the distribution of C. caroliniana. At present, C. caroliniana covers an area of approximately 1531×104 km2 of appropriate habitat, especially in the south-eastern parts of South, central and North America, Southeast Asia, eastern Australia, and most of Europe. The suitable regions are anticipated to expand under future climate scenarios; however, the dynamics of the changes vary between different extents of climate change. For example, C. caroliniana is expected to expand to higher latitudes, following global temperature increases under SSP1–2.6 and SSP2–4.5 scenarios, however, intolerance to temperature extremes may mediate invasion at higher latitudes under future extreme climate scenarios, e.g., SSP5–8.5. Owing to the severe impacts its invasion causes, early warning and stringent border quarantine processes are required to guard against the introduction of C. caroliniana especially in the invasion hotspots such as, Peru, Italy, and South Korea.

Biotope Map Creation Method and Utilization Plan for Eco-Friendly Urban Development

A biotope map provides ecological and spatial information that reflects the natural and ecological features and values of a city. In South Korea, efforts have been made to create a map that includes grades based on evaluating the ecological value of a specific surface space. However, plans for applications have not been established, except for development restrictions or regulations for biotopes with high ecological value ratings. The aim of this study was to promote environmentally friendly and sustainable urban management through ecological land use management for all biotope types that are influenced by anthropogenic land use. Strategies for maintenance, protection, recovery, improvement, creation, and reduction based on ecological restoration principles were set as management goals. To achieve these management goals, evaluation items and indicators were suggested for minor-classification types and applied to Dongducheon City. Management strategies were suggested for target sites based on grades and thematic maps of biotope types to be utilized, such as urban ecological axes, river naturality restoration, and wetland and forest preservation. These findings support sustainable and environmentally friendly urban development by providing fundamental data for ecological and environmental management, including the preservation and restoration of natural environments and the creation of urban ecological networks.

How does air pollution affect floating population in metropolitan city: embedding-based approach

AbstractRecently, the air pollution has been seriously regarded in the urban environment. Particularly, the substantial relationship between the air pollution and the daily movements of citizens has not been sufficiently investigated yet. This study attempts to empirically identify the patterns of air pollution using association rule mining from Seoul, the metropolitan city in South Korea. As a result, 214 patterns on air pollution are discovered, and those are embedded into vectors based on Doc2Vec technique. Then, this paper further examines how the movement of citizens reacts to the discovered patterns of air pollution by deploying the linear regression on the floating population with emphasis on the walk-traffic. Specifically, the walk-traffic is categorized into 14 categories by gender and age group, and the effects of air pollution patterns on each subgroup walk traffic were analyzed. Findings of this paper provide the empirical evidences on the estimated air pollution sensitivity by generation and gender to researchers and practitioners. This paper has the contribution on newly proposing the methodological framework for further managing the air pollution in the urban environment. Graphical abstract

Enhancing Dementia Nursing Homes in South Korea: Lessons from German Building Standards

South Korea is an aging society with a rapidly increasing number of people with dementia. In that context, this study aimed to compare dementia nursing home building standards in South Korea and Germany, based on the minimum physical and architectural requirements specified by both countries’ relevant laws, to gain insights into improving South Korean building standards. I examined South Korea’s Welfare of Senior Citizens Act and its Enforcement Regulations, and Germany’s Federal Nursing Home Act (HeimG), Regulation on Minimum Standards for Nursing Homes (HeimMindBauV), and the corresponding state regulations. The analysis revealed differences regarding the basic requirements, facility sizes, composition of necessary rooms, and detailed regulations pertaining to these rooms. South Korea emphasized autonomy, including barrier-free and compensatory environments, as well as safety and security. Meanwhile, Germany enhanced similar aspects of autonomy to those in South Korea, including the barrier-free standard DIN 18040-2. Additionally, Germany incorporated features such as familiarity, sensory stimulation, legibility, and social interaction, reflecting aspects that offer orientational cues for autonomy. Improving South Korean building standards requires stronger regulations on the autonomy of individuals with dementia. Further, additional regulations on familiarity, sensory stimulation, legibility, and social interactions should be considered. The results provide foundational data for cross-national comparisons to establish building standards for dementia-friendly built spaces in dementia nursing homes in South Korea. Further surveys on spatial utilization, discussions, and the application of proposed improvements in Korea would contribute to enhancing the dementia-friendly nursing home design in the country.

Genetic and virulence characteristics of hybrid Shiga toxin-producing and atypical enteropathogenic Escherichia coli strains isolated in South Korea

IntroductionThe predominant hybrid pathogenic E. coli, enterohemorrhagic E. coli (EHEC), combines characteristics of Shiga toxin-producing E. coli (STEC) and enteropathogenic E. coli (EPEC), contributing to global outbreaks with severe symptoms including fatal consequences. Since EHEC infection was designated as a notifiable disease in 2000 in South Korea, around 2000 cases have been reported, averaging approximately 90 cases annually.AimIn this work, genome-based characteristic analysis and cell-based assay of hybrid STEC/aEPEC strains isolated from livestock feces, animal source foods, and water in South Korea was performed.MethodsTo identify the virulence and antimicrobial resistance genes, determining the phylogenetic position of hybrid STEC/aEPEC strains isolated in South Korea, a combination of real-time PCR and whole-genome sequencing (WGS) was used. Additionally, to assess the virulence of the hybrid strains and compare them with genomic characterization, we performed a cell cytotoxicity and invasion assays.ResultsThe hybrid STEC/aEPEC strains harbored stx and eae genes, encoding Shiga toxins and E. coli attachment/effacement related protein of STEC and EPEC, respectively. Furthermore, all hybrid strains harbored plasmid-carried enterohemolysin(ehxCABD), a key virulence factor in prevalent pathogenic E. coli infections, such as diarrheal disease and hemolytic-uremic syndrome (HUS). Genome-wide phylogenetic analysis revealed a close association between all hybrid strains and specific EPEC strains, suggesting the potential acquisition of Stx phages during STEC/aEPEC hybrid formation. Some hybrid strains showed cytotoxic activity against HeLa cells and invasive properties against epithelial cells. Notably, all STEC/aEPEC hybrids with sequence type (ST) 1,034 (n = 11) exhibited higher invasiveness than those with E2348/69. This highlights the importance of investigating potential correlations between STs and virulence characteristics of E. coli hybrid strains.ConclusionThrough genome-based characterization, we confirmed that the hybrid STEC/aEPEC strains are likely EPEC strains that have acquired STEC virulence genes via phage. Furthermore, our results emphasize the potential increased danger to humans posed by hybrid STEC/aEPEC strains isolated in South Korea, containing both stx and eaeA, compared to STEC or EPEC alone.

Turning the tide on big cat trade: Expert opinion on trends and conservation lessons from the Republic of Korea.

Unsustainable trade in big cats affects all species in the genus, Panthera, and is one of the foremost threats to their conservation. To provide further insight into the impact of policy interventions intended to address this issue, we examine the case study of the Republic of Korea (South Korea), which in the early 1990s was one of the world's largest importers of tiger (Panthera tigris) bone and a major manufacturer of tiger-derived medicinal products. In 1993, South Korea became a Party to the Convention on International Trade in Endangered Species (CITES) and introduced a ban on commercial trade in CITES Appendix I-listed big cats a year later. We used an expert-based questionnaire survey and an exploration of the CITES trade database to investigate what has since happened to big cat trade in South Korea. Expert opinion suggested that big cat trade has likely substantially reduced since the early 1990s, as a result of the trade ban and broad socioeconomic changes. However, illegal trade has not been eradicated entirely and we were able to confirm that products reportedly derived from big cats were still publicly available for sale on a range of Korean online marketplaces, sometimes openly. The items most commonly reported by respondents from post-1994 trade and supported by expert-led evidence were tiger and leopard (Panthera pardus) skins and tiger bone wine. Although South Korea may provide a useful case study of a historically significant consumer country for tiger which has made strong progress in addressing unsustainable levels of big cat trade within a short period of time, there remains a need to address recalcitrant small-scale, illegal trade. We also recommend further investigation regarding reports of South Korean nationals being involved in illegal trade in tiger-derived products in Southeast Asia.

A Study on MBTI Perceptions in South Korea: Big Data Analysis from the Perspective of Applying MBTI to Contribute to the Sustainable Growth of Communities

This study aimed to assess the potential contributions of the Myers–Briggs Type Indicator (MBTI) to the sustainable growth of communities by conducting a comprehensive analysis of social perceptions of the MBTI in South Korea through big data analysis. The investigation encompasses three primary stages: data collection, preprocessing, and analysis, involving text mining, network analysis, CONCOR analysis, and sentiment analysis. A total of 31,308 text data pieces (13.73 MB) from various sources, including news, blogs, and other sections of Naver and Google, over the past three years, were collected and analyzed using the keyword “MBTI.” Tools, such as Textom SV, UCINET, and NetDraw, were employed for data collection and analysis. The study’s key findings include the identification, through term frequency (TF) and TF-inverse document frequency analyses, of top-ranking terms, such as 16Types, 4Indicators, Test, Myself, OthersMBTI, Situation, and Contents. The CONCOR analysis further revealed six clusters, encompassing themes like interest in MBTI personality tests, application of 16 types in daily life, MZ’s MBTI consumption patterns, trending of MBTI characters, extension to K-Test, and professional use of MBTI. Moreover, sentiment analysis indicated that 68.5% of individuals in South Korea expressed a positive sentiment towards MBTI, while 31.5% conveyed a negative sentiment. The specific emotions identified included liking (Good Feeling), disgust, and interest, in order of prominence. In light of these findings, this study delineates a spectrum of perceptions regarding MBTI in South Korea, encompassing both positive interests and negative concerns. To ensure the responsible use of MBTI, it is imperative to implement reliable scientific testing and education, mitigate the potential harm of stereotyping, and reshape social perceptions surrounding MBTI usage. Only through these measures can MBTI genuinely contribute to the sustainable growth of communities without being confined to limiting stereotypes.

Designing for Modern Living

This study delves into the evolving landscape of modern living in South Korea, which has the widespread apartment complexes that have emerged from the efficiency centric approaches of industrial capitalism. It explores the paradigm shift in the 21st-century capitalist society, which now values creativity and individual expression over functionality and uniformity. This shift has led to a noticeable disparity between the monotonous spatial composition of mass-produced housing and the dynamic, creative lifestyles of contemporary residents. The research method involves a comprehensive analysis of both lifestyle and architectural magazines, providing insights into the changing preferences and lifestyles of residents, as well as the perspectives of professionals. The study aimed to highlight the changing nature of residential spaces and the design strategies, moving away from the conventional utility-focused designs, towards environments that foster creativity and reflect the individuality of inhabitants. Key findings indicate a growing public preference for residential spaces that are versatile, creatively stimulating, and aligned with the multifaceted nature of modern lifestyles. Contrasting these views, architectural experts emphasize the fundamental values of living, advocating for spaces that connect residents with nature and enrich everyday experiences through sensory engagement. The study concludes that while there is a divergence in perspectives between the general public and architectural specialists, both recognize the necessity for sustainable housing solutions. These solutions should cater to contemporary societal changes while preserving essential life values, thereby overcoming the limitations of the prevalent apartment centric urban housing model in South Korea.

Is replacing missing values of PM2.5 constituents with estimates using machine learning better for source apportionment than exclusion or median replacement?

East Asian countries have been conducting source apportionment of fine particulate matter (PM2.5) by applying positive matrix factorization (PMF) to hourly constituent concentrations. However, some of the constituent data from the supersites in South Korea was missing due to instrument maintenance and calibration. Conventional preprocessing of missing values, such as exclusion or median replacement, causes biases in the estimated source contributions by changing the PMF input. Machine learning (ML) can estimate the missing values by training on constituent data, meteorological data, and gaseous pollutants. Complete data from the Seoul Supersite in 2018 was taken, and a random 20% was set as missing. PMF was performed by replacing missing values with estimates. Percent errors of the source contributions were calculated compared to those estimated from complete data. Missing values were estimated using a random forest analysis. Estimation accuracy (r2) was as high as 0.874 for missing carbon species and low at 0.631 when ionic species and trace elements were missing. For the seven highest contributing sources, replacing the missing values of carbon species with estimates minimized the percent errors to 2.0% on average. However, replacing the missing values of the other chemical species with estimates increased the percent errors to more than 9.7% on average. Percent errors were maximal at 37% on average when missing values of ionic species and trace elements were replaced with estimates. Missing values, except for carbon species, need to be excluded. This approach reduced the percent errors to 7.4% on average, which was lower than those due to median replacement. Our results show that reducing the biases in source apportionment is possible by replacing the missing values of carbon species with estimates. To improve the biases due to missing values of the other chemical species, the estimation accuracy of the ML needs to be improved.

What to give your robot mother on Mother's Day.

Jung_E, the 2023 science-fiction movie from South Korea, suggests that a novel leg-wheel hybrid for robot locomotion might be appreciated.