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Employee mental health is a central issue in today's global workplace. This paper analyzes the effect of high performance work systems (HPWSs) on employee mental health. We integrate HPWS concepts with job demands‐resources (JD‐R) theory to examine competing theoretical perspectives—a positive HPWS influence and a negative HPWS influence on employee mental health. We examine employees' perceptions of psychological empowerment as an indicator of the motivational pathway of the JD‐R and work‐role overload as an indicator of the strain pathway to explain the differential effect of HPWSs on mental health. We also incorporate organizational identification theory to demonstrate how one's identification with the organization can either accentuate or attenuate feelings of both psychological empowerment and work‐role overload. Findings from a study of 999 employees in 174 South Korean organizations indicate that HPWSs are positively associated with employee mental health via employee perceptions of empowerment and that HPWSs are negatively associated with employee mental health through perceptions of work‐role overload. Furthermore, the study finds that organizational identification attenuates the relationship between HPWS and both empowerment and overload. Practice‐level post hoc analyses also reveal that the job design characteristics, pay level, and participative decision‐making are linked to empowerment. In addition, participative decision‐making is most strongly associated with work overload. [ABSTRACT FROM AUTHOR]

The purpose of this paper is to a develop model for generation expansion planning that can support diverse environmental policies for the reduction of greenhouse gases (GHGs) of South Korea. South Korea is required to reduce its GHG emissions by 30% from the BAU level by 2020. The Wien Automatic System Planning Package currently used in South Korea has limitations in terms of the application of renewable energy policies and GHG targets; this paper proposes the use of an equipment planning model named generation and transmission expansion program, which has been developed to resolve such limitations. For verification of the model, a case study on the 6th Basic Plan of Long-Term Electricity Supply and Demand has been conducted. The results show that for the year 2020 South Korea's annual GHG emissions will be 36.6% more than the GHG Target Management System (GHG TMS) target set for the same year (30%). To achieve the GHG TMS target, the costs involved amount to about 72 trillion KRW (70 billion USD). Consequently, the South Korean government needs to review the performability of this target. [ABSTRACT FROM AUTHOR]

Pairs trading is an instance of statistical arbitrage that relies on heavy quantitative data analysis to profit by capitalising low-risk trading opportunities provided by anomalies of related assets. A key element in pairs trading is the rule by which open and close trading triggers are defined. This paper investigates the use of time series regression to define the rule which has previously been identified with fixed threshold-based approaches. Empirical results indicate that our approach may yield significantly increased excess returns compared to ones obtained by previous approaches on large capitalisation stocks in the Korean equities market. [ABSTRACT FROM AUTHOR]

In case library learning, an instructional method that promotes case‐based problem solving, learners often struggle with indexing cases. Poor case indexing may hamper retention and retrieval of cases, hindering the construction of mental libraries in learners. To address this issue, the authors developed two indexing prompt types, explanation‐based and difference‐based, and explored their effects on self‐explanation and problem solving in case libraries. A total of 105 students across three sections of a career development course participated in the study. Each section was assigned to one of three conditions: explanation‐based indexing, difference‐based indexing and no indexing prompt. Both indexing prompts facilitated self‐explanation, which elaborated corresponding aspects of cases on which the prompts mainly focused. In arguing for a solution, learners relied more heavily on domain knowledge regardless of prompt types. However, both indexing prompt groups outperformed the control group in rebuttals. The authors discussed the theoretical and practical implications of the study. Lay Description: What is already known about this topic:A case library learning is a favorable learning environment that delivers authentic decision‐making problems and facilitates argumentation skill acquisition.Learners often struggle with indexing cases without sufficient guidance, and subsequently, have difficulties in retrieving and reusing the cases to solve problems.Promoting high‐quality self‐explanations has been proved effective in learning from cases and improving subsequent problem‐solving.What this paper adds:Indexing prompts that direct learner's attention to either anomalous or different features between cases can foster self‐explanations that elaborate the corresponding aspects of cases on which the prompts focused.Learners in case libraries tend to rely more heavily on domain knowledge they could gain from instructional materials than direct lessons from the cases.Learners who engage in indexing cases with prompts can construct their argumentation better by rebutting well for their contentions.Implications for practice and/or policy:Prompting self‐explanations on anomalies, differences, or similarities between cases can maximize the benefits of case‐based learning environments.ICase libraries will demonstrate the full potential when learning materials that contain domain knowledge related to the case lessons are incorporated into the case libraries. [ABSTRACT FROM AUTHOR]

Accurate forward modeling of acoustic propagation is crucial in underwater sound applications that rely on coherent field predictions, such as source localization and geoacoustic inversion based on matched field processing concepts. As acoustic propagation in shallow water environments becomes important in recent years, range-dependent modeling due to environmental changes has to be considered of which parabolic equation (PE) method has received widespread use because they are accurate and relatively fast. In this paper, Seoul National University parabolic equation (SNUPE) employing a multiplicative Padé formulation is developed. Linearization of the depth direction operator is achieved via expansion into a multiplication form of Padé approximation. To approximate the depth directional equation, Galerkin's method is used with partial collocation to achieve computational efficiency. To approximate the range directional equation, Crank-Nicolson's method is used. Finally, numerical self-starter has been used to initiate the near-field solution. The Shallow Water Acoustic Modeling (SWAM' 99) Workshop provides an opportunity to test SNUPE's accuracy and compare its results with others for a variety of synthetic environments. In this paper, the numerical implementation and accuracy of SNUPE is tested by comparing with RAM[sup 12] results for the SWAM'99 test cases. Numerical experiments for SWAM'99 test cases give satisfactory results in accuracy for SNUPE and show the importance of the bottom information in the shallow water acoustic modeling. [ABSTRACT FROM AUTHOR]

Background The rising incidence of thyroid cancer (TC) has generated growing concern globally; yet there are no studies examining whether this incidence was followed by a rise in related mortality. We aimed to comprehensively quantify current trends and future projections of TC incidence and mortality, and to explore the association between the TC burden and socioeconomic inequality in different income strata. Methods We obtained incidence and mortality data on TC and population from the 2019 Global Burden of Disease (GBD) study and the United Nations' World Population Prospects 2022. We applied an age-period-cohort (APC) model to estimate the overall annual percentage change (net drift) and age, period, and cohort effects from 1990 to 2019, and also constructed a Bayesian APC model to predict the TC burden through 2030. Results Over a third of global TC cases belonged to the high-income group. From 1990 to 2019, net drifts of TC incidence were >0 in all income groups, while a modest reduction (net drift <0) in mortality was observed in most income groups, except for the lower-middle-income group. Unfavourable age, period, and cohort effects were most notable in Vietnam, China, and Korea. The age-standardised incidence rate (ASIR) is predicted to increase whereas the age-standardized mortality rate (ASMR) is expected to decrease globally between 2020 and 2030, with geographic heterogeneity being detected across income groups. We observed a positive correlation between ASIR and universal health coverage index and health worker density, but a negative one between ASMR and the two indicators, primarily in upper-middle-income and high-income countries. Conclusions Opposite patterns in incidence and mortality of TC raise concerns about overdiagnosis, particularly in upper-middle-income and high-income countries. Discrepancies in the distribution of health service accessibility, including diagnostic techniques and therapeutic care, should be addressed by narrowing health inequalities in the TC burden across countries. [ABSTRACT FROM AUTHOR]

This paper illustrates a methodology called choice modeling (CM) that allows a comparison between beef quality preference profiles of three different merchandising groups in South Korea. The CM data was collected from three equally proportioned retailer, wholesaler and importer groups in South Korea by a mail survey. Multinomial logit model (MNL) estimation of the CM data showed that all three merchandising groups currently define preferences for imported beef cut with narrow range and specificity. The choice modeling (CM) technique that was applied in this study is found to be effective in eliciting product profile of a beef cut that is preferred specifically by a particular merchandising group. Construction of a preferred product profile of a beef cut for each merchandising group provides a basis for marginal analysis of factor level changes on buyers' purchasing choices. Information on preferred product profiles and marginal analysis of three merchandising groups' beef purchasing behavior can facilitate differentiated product development and marketing programs at different stages of the beef sup- ply chain in Korea. [ABSTRACT FROM AUTHOR]

Integrating the literatures on strategic human resource management and organizational support theory, we examine the cross‐level relationship between high performance work systems (HPWS) at the team‐level and individual perceptions of organizational support (i.e., POS). In addition, we introduce a critical boundary condition, the HR department's organizational embodiment (HROE), which involves the extent to which employees identify the HR department with the organization. We propose that the cross‐level HPWS–POS relationship is moderated by HROE, such that the linkage between HPWS and POS is stronger when HROE is high. With a sample of 103 teams and 399 employees in South Korea, we find that HPWS utilization increases POS and that this relationship is stronger when HROE is high. We also find that HR department status and the favorable attitude of the HR head are antecedents to HROE. These findings suggest that HROE is a critical boundary condition for the relationship between HPWS and POS with subsequent effects on organizational commitment and job satisfaction. [ABSTRACT FROM AUTHOR]

To better understand users’ technology utilisation behaviour, a construct named technology dependence is suggested; as well a technology dependence model is proposed and empirically tested. Based on the literature on marketing, information systems’ utilisation, and psychology, a comprehensive set of constructs and hypotheses are compiled with a methodology for testing them in this paper. A questionnaire was designed and data were collected from 255 users of smartphones in Korea, mainly consisting of students and academics. Structural equation modelling was then applied to analyse the data. The result indicated that engagement is the strongest indicator of technology dependence along with user satisfaction. User satisfaction is affected by engagement and responsiveness of the technology. And all three dimensions of interactivity, namely, control, communication, and responsiveness, are revealed to be significant indicators of engagement. Based on the findings, the model develops useful insights into the factors that influence technology dependence and provides new ideas in understanding technology utilisation. [ABSTRACT FROM PUBLISHER]

Since the first outbreak of Middle East Respiratory Syndrome (MERS), Korea has a quite rapid MERS spread compared to other countries. Possible causes for such a sudden increase include the undiagnosed initial patient and lapses in infection control practices. To characterize MERS infection and transmission, this paper applies the period-based discrete SEIR model. Infected people of SEIR model shows a good fit to observed patients and MERS will become extinct around 113 days since the first outbreak. Through an effective quarantine plan, if we can reduce exposable people by 20%, it is estimated that the maximum number of infectious people may decrease by about 69% and MERS fade-out period will be shortened by about 30%. Simulations on assumed model support that Korean government's two policies to control MERS infection rate are effective in lessening its spread. Simulation on reproduction ratio scenarios in SEIR model indicates that success in early infection control practices is critical for shortening the period of disease fade-out. Even there are some restrictions and assumptions on SEIR model simulation, our simulation results are to be helpful in developing strategies to prevent the infectious diseases like MERS. [ABSTRACT FROM AUTHOR]

This paper argues that in the case of Korea, cultural diplomacy (CD) has been explicitly implemented in a top-down and unilateral approach by government to enhance national prestige abroad, underpinned by the institutional legacy of a ‘developmental state’ model of governance. Yet, an implicit approach has also emerged, associated with capacity building of the domestic cultural industries through promoting ‘international cultural exchange’. Whilst the top-down unilateral approach has persisted, a disarray of policy rhetoric and institutional fragmentation surrounding CD, as well as the blurring of cultural industries development policy with the CD agenda has led to gradual convergence of both explicit and implicit approaches. [ABSTRACT FROM PUBLISHER]

This paper attempts to examine the strategies of national innovation system that shaped the science and technology cycles of South Korea, Taiwan, Singapore, Malaysia and China by theorizing the science and technology (proxied by papers and patents) trajectories of these economies using Meyer's taxonomy of bi-logistic growth. The findings suggest that the strategic catch-up models of South Korea and Taiwan have resulted in a much longer pulse in the growth trajectories during the transition towards knowledge-based economy than countries that are dependent on FDI for learning and acquiring technology during the early catch-up period such as China and Malaysia, while the results are mixed for Singapore. The catch-up strategy of supporting new start-ups for pioneering technology facilitated the development of capabilities of indigenous firms in the case of South Korea and Taiwan. This provides a policy lesson for transition from industrial-based to knowledge-driven development through the formation of evolving dynamic propagating behavior in science and technology. [ABSTRACT FROM AUTHOR]

Steep slope, heavy rainfall and forested cover have unique soil erosion and sediment transport in South Korea. Sediment transport pattern in the monsoon region (from June to September) is complex and sediment transport modeling in these areas is often difficult as sediment load in the river varies largely from year to year. This paper describes a GIS-based soil erosion model and then developed a sediment transport model to estimate sediment yield (SY) at different basin scales. The model for estimating suspended sediment is based on Revised Universal Soil Loss Equation and suspended delivery ratio (SDR) models. For applying SDR model, basin-specific parameter was validated on the basis of field data, which ranged from 0.6 to 1.2 based on observed SY. In the study region, the high flow rates lasted for 4 months (from July to September) and over 90 % of total SY discharged during that time. At that time, it was found that annual bed loads in this area are 56-84 % of total sediment loads. [ABSTRACT FROM AUTHOR]

Aims: To examine the presence of symptom clusters and synergistic effects of symptom clusters on quality of life in rheumatoid arthritis patients. Background: Rheumatoid arthritis patients frequently experience multiple concurrent symptoms of pain, fatigue, and depression. Design A nonexperimental, cross‐sectional correlation design. Methods: The study participants were 179 rheumatoid arthritis patients. Data were collected between August and December 2016. A hypothetical model was developed based on the Theory of Unpleasant Symptoms Model: physiological antecedents included disease activity and obesity; symptoms of pain, fatigue, and depression were hypothesized as being clustered, and quality of life was taken as the outcome variable. Results: Disease activity had significant direct effects on pain, fatigue, and depression and indirect effects on fatigue and depression, whereas obesity had a significant direct effect on fatigue alone. Three symptom clusters, namely, pain fatigue, fatigue depression, and pain‐fatigue depression were identified and found to have significant synergistic effects on quality of life. Conclusions: Our findings support the importance of managing clusters of symptoms simultaneously, that is, collective symptom management. Inter‐cluster dynamics between symptoms should be considered when nurses develop symptom management strategies or self‐management programs to improve the quality of life of rheumatoid arthritis patients. SUMMARY STATEMENTS: What is known about this topic? A symptom cluster is a stable group of different symptoms that co‐occur in association with a specific disease.Rheumatoid arthritis patients frequently experience multiple concurrent symptoms of pain, fatigue, and depression. What this paper adds? The most common and distressing rheumatoid arthritis symptoms of pain, fatigue, and depression were found to co‐occur and to be interrelated, which are the two major criteria of symptom clusters.Three symptom clusters, namely, pain fatigue, fatigue depression, and pain‐fatigue depression, were identified and found to have significant synergistic effects on quality of life. The implications of this paper: Our findings support the importance of managing clusters of symptoms simultaneously, that is, collective symptom management.The complicated intercluster dynamics demonstrated between symptoms in the present study should be considered when nurses develop effective symptom management strategies or self‐management intervention programs to improve the quality of life of rheumatoid arthritis patients. [ABSTRACT FROM AUTHOR]

The objective of this paper is to develop a model to estimate soil erosion based on data from natural rainstorms on the hillslopes of burnt mountains. For this research, 52 plots were established on mountain slopes in the eastern coastal region of South Korea and operated for 6 years after the fire. Runoff and soil erosion were influenced greatly by rainfall and vegetation factors, respectively. The vegetation index that reflects the structure of vegetation recovered after the forest fire and the soil index that reflects soil characteristics in burnt forest lands showed higher correlations than factors of the revised universal soil loss equation (RUSLE). Sediment yield decreased generally with increasing slope steepness and length because of the effects of depression storage and flow interception by stems and litter on forest lands. The Soil Erosion Model for Mountain Areas in Korea (SEMMA), used to compute sediment yield from hillslopes, is a statistical model composed of four variables: rainfall, vegetation cover, soil, and topography. According to sensitivity analysis for each parameter, rainfall and vegetation showed high sensitivities. The SEMMA model was improved by developing several equations that were classified by rainfall depth and vegetation coverage. This model may be applied usefully to assess soil erosion risks in burnt mountains. [ABSTRACT FROM AUTHOR]

While e-commerce has proliferated with the growth of the Internet, there have been insufficient research efforts concerning its status in Korea. The United States, in contrast, has made significant efforts in making empirical research on the consumer's adoption of e-commerce. This paper validates the e-Commerce Adoption Model (eCAM) on the two countries. E-CAM integrates the technology acceptance model with the theories of perceived risk to explain the e-commerce adoption. The study findings not only provide interim support for the generalizability of e-CAM, but also suggest that online firms should consider these contextual factors in order to facilitate consumers' adoption behavior. [ABSTRACT FROM AUTHOR]

BACKGROUND: Although burnout among nurses has been studied in a great deal, this work has not included Korean nurses. Furthermore, the role of personal resources such as empathy and empowerment in predicting the variance in burnout has never been examined. AIM: The purpose of this study was to understand the phenomenon of burnout among Korean nurses. A comprehensive model of burnout was examined to identify significant predictors among individual characteristics, job stress and personal resource, with the intention of providing a basis for individual and organizational interventions to reduce levels of burnout experienced by Korean nurses. METHODS: A cross-sectional correlational design was used. A sample of 178 nurses from general hospitals in southern Korea was surveyed from May 1999 to March 2000. The data were collected using paper and pencil self-rating questionnaires and analysed using descriptive statistics, Pearson correlations, and hierarchical multiple regression. RESULTS: Korean nurses reported higher levels of burnout than nurses in western countries such as Germany, Canada, the United Kingdom and the United States of America. Nurses who experienced higher job stress, showed lower cognitive empathy and empowerment, and worked in night shifts at tertiary hospitals were more likely to experience burnout. CONCLUSIONS: Identifying a comprehensive model of burnout among Korean nurses is an essential step to develop effective managerial strategies to reduce the problem. Suggestions to reduce the level of burnout include enhancing nurses' cognitive empathy and perceived power, providing clear job descriptions and work expectations, and exploring nurses' shift preferences, especially at tertiary hospitals. In future research we recommend recruiting nurses from broader geographical areas using random selection in order to increase the generalizability of the findings. [ABSTRACT FROM AUTHOR]

Objective. This study aimed to explore the influencing factors to the practice of cardiovascular disease (CVD) preventive behaviors among rural residents based on socio-ecological model (SEM). Methods. We used a mixed-methods research using the sequential explanatory design. From a total of 109 participants, quantitative data including CVD preventive behavior, self-efficacy, social support, and sense of community were collected using previously developed measurement tools. For quantitative research, descriptive statistics and Pearson correlation analysis were conducted. For quantitative research, descriptive statistics and Pearson correlation analysis were conducted. Questions for qualitative research were constructed based on SEM for the three subareas identified in quantitative research. Qualitative content analysis was conducted on qualitative data collected through focus group interviews from 14 participants. Results. According to quantitative research results, participants had a low level of practice in physical exercise, stress management, and self-checking among seven subdomains. At the individual level, self-efficacy was positively correlated with sleep management, and at the interpersonal level, family support was positively correlated with smoking cessation and support from significant others was positively correlated with stress management. On the other hand, at the community level, sense of community did not show significant correlation with the practice of cardiovascular disease prevention. Next, according to qualitative research results, 8 themes were identified in three levels as obstacles. At the personal level, overwork, loneliness, and lack of knowledge about CVD; at the interpersonal and community level, decreased activities with residents due to increased individualistic tendencies and decreased sense of community; and at the community environmental level, inconvenience of sidewalks, lack of community space, and insufficient functioning of village health clinics. Conclusion. In order to reduce obstacles to health behavior practice to prevent cardiovascular disease, multidimensional efforts are needed in terms of socio-ecological aspects. [ABSTRACT FROM AUTHOR]

Elder suicide is a serious concern in many countries, including South Korea. Various policies and programs to prevent elder suicide are essential; however, further understanding of this phenomenon is necessary. The current study, therefore, developed a model for understanding the underlying mechanism of suicidal ideation in older adults in South Korea. The model was based on Andersen's theory (2021), which explains the path from social relationships to mental health. This study was conducted utilizing meta-analytic structural equation modeling in accordance with a pooled correlation matrix. We used data from 93 existing studies systematically identified in nine academic databases. The fit statistics show that our model fits the data well. The results demonstrated that suicidal ideation was directly affected by abuse, depression, and self-esteem but not by family relationships. Depression significantly mediated the relationship between abuse and suicidal ideation and between family relationships and suicidal ideation. Social relationships play an important role in determining mental health among Korean older adults, consistent with Andersen's theory. Prevention of elder abuse and depression is essential in preventing suicide among older adults in South Korea. [ABSTRACT FROM AUTHOR]

When high‐performance work systems (HPWS) positively affect firm performance, both internal and external contingencies play potentially salient roles in its influence. Our study pays attention to organizational (unabsorbed) slack and industry instability as important boundary conditions in the relationship between HPWS and firm performance. Based on 307 Korean firms in 39 industries, our research found moderating effects of unabsorbed slack and industry instability in the relationship between HPWS and firm performance. We found that HPWS's positive effect on firm performance is strongest when a firm possesses more slack resources in an unstable industry. [ABSTRACT FROM AUTHOR]

Compartment models, a type of mathematical model, have been widely applied to characterize the changes in a dynamic system with sequential events or processes, such as the spread of an epidemic disease. A compartment model comprises compartments, and the relations between compartments are depicted as boxes and arrows. This principle is similar to that of the system dynamics (SD) approach to constructing a simulation model with stocks and flows. In addition, both models are structured using differential equations. With this mutual and translatable principle, this study, in terms of SD, translates a reference SEIR model, which was developed in a recent study to characterize the transmission of the Middle East respiratory syndrome (MERS) in South Korea. Compared to the replicated result of the reference SEIR model (Model 1), the translated SEIR model (Model 2) demonstrates the same simulation result (error=0). The results of this study provide insight into the application of SD relative to constructing an epidemic compartment model using schematization and differential equations. The translated SD artifact can be used as a reference model for other epidemic diseases. [ABSTRACT FROM AUTHOR]

Asia's pharmaceutical sector has experienced remarkable growth over the last two decades, with companies in the region producing bulk of the world's specialty generics, biologicals, and active pharmaceutical ingredients (APIs). The Asian pharma growth story has had several pillars for a strong and sustainable foundation that provided non-linear growth. This report introduces three models showing how Asian countries at different development stages — India, South Korea, and Singapore — have nurtured their own, self-sustaining pharmaceutical sectors. [ABSTRACT FROM AUTHOR]

In this study, compatible taper and stem volume equations were developed for Larix kaempferi species of South Korea. The dataset was split into two groups: 80% of the data were used in model fitting and the remaining 20% were used for validation. The compatible MB76 equations were used to predict the diameter outside bark to a specific height, the height to a specific diameter and the stem volume of the species. The result of the stem volume analysis was compared with the existing stem volume model of Larix kaempferi species of South Korea which was developed by the Korea Forest Research Institute and with a simple volume model that was developed with fitting dataset in this study. The compatible model provided accurate prediction of the total stem volume when compared to the existing stem volume model and with a simple volume model. It is concluded that the compatible taper and stem volume equations are more convenient to use and therefore it is recommended to be applied in the Larix kaempferi species of South Korea. [ABSTRACT FROM AUTHOR]

This acoustic study explores how Korean learners produce coarticulatory vowel nasalization in English that varies with prosodic structural factors of focus-induced prominence and boundary. N-duration and A1-P0 (degree of V-nasalization) are measured in consonant-vowel-nasal (CVN) and nasal-vowel-consonant (NVC) words in various prosodic structural conditions (phrase-final vs. phrase-medial; focused vs. unfocused). Korean learners show a systematic fine-tuning of the non-contrastive V-nasalization in second language (L2) English in relation to prosodic structure, although it does not pertain to learning new L2 sound categories (i.e., L2 English nasal consonants are directly mapped onto Korean nasal consonants). The prosodic structurally conditioned phonetic detail in English appears to be accessible in most part to Korean learners and was therefore reflected in their production of L2 English. Their L2 production, however, is also found to be constrained by their first language (L1-Korean) to some extent, resulting in some phonetic effects that deviate from both L1 and L2. The results suggest that the seemingly low-level coarticulatory process is indeed under the speaker's control in L2, which reflects interactions of the specificities of the phonetics-prosody interface in L1 and L2. The results are also discussed in terms of their implications for theories of L2 phonetics. [ABSTRACT FROM AUTHOR]

Simple Summary: The tobacco cutworm, Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae), is a highly polyphagous and destructive insect pest, damaging a wide range of vegetables and field crops in Korea. Timely management is very important, as delays can lead to considerable economic losses. For timely management, the development of precise forecasting models is important in pest management. In this study, we estimated the temperature-based thermal requirements of S. litura with linear and nonlinear models on host plants to develop models to foresee the spring emergence and population dynamics of S. litura. We found a significant impact of temperature and host plant on the development of S. litura. Development was found to be inversely proportionate to temperature, despite no development at extreme temperatures. Based on the estimated thermal requirements, we developed a forecasting model, and this predicated the spring emergence of S. litura in May–June. Thus, the continuous observation of S. litura in crop fields is required in order to prepare more advanced administration measures against S. litura. The tobacco cutworm, Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae), is one of the most serious pests in field crops, vegetables, and ornamentals. Temperatures (15, 20, 25, 27, 30, 35, and 40 °C), host plants (soybean (Glycine max (L.)), maize (Zea mays L.), groundnut (Arachis hypogaea L.) and azuki bean (Vigna angularis (Willd.) Ohwi & H. Ohashi,), and the artificial diet-dependent developmental parameters and survival of S. litura were examined in this study. Stage-specific parameters such as threshold development temperature (LDT) and thermal constant (K) (Degree day (DD)) were determined by linear and nonlinear models (Sharpe–Schoolfield–Ikemoto), respectively. The total developmental time (egg–adult) decreased with increasing temperature on host plants and with an artificial diet. The total immature developmental time varied from 106.29, 107.57, 130.40, 111.82, and 103.66 days at 15 °C to 22.47, 21.25, 25.31, 18.30, and 22.50 days at 35 °C on soybean, maize, groundnut, azuki bean, and artificial diet, respectively. The LDT for the total immature completion was 7.50, 9.48, 11.44, 12.32, and 7.95 °C on soybean, maize, groundnut, azuki bean, and artificial diet, respectively. The K for the total immature completion was 587.88, 536.84, 517.45, 419.44, and 586.95 DD on soybean, maize, groundnut, azuki bean, and artificial diet, respectively. Temperature and host plant interaction also influenced the longevity and survival of adults. The findings of this study can be used to predict the number of generations, spring emergence, and population dynamics of S. litura. The nutrient content analysis of the host plants is discussed in terms of the developmental patterns of S. litura. [ABSTRACT FROM AUTHOR]

Drawing from the notion of cultural friction and based on the agency theory rationalization of multinational enterprise (MNE) headquarter–subsidiary relationship, we examine the impact of cultural friction in foreign subsidiaries on subsidiary performance. We argue that cultural friction, arising due to a high presence of parent country nationals (PCNs) in culturally distant locations, has a detrimental effect on subsidiary performance. This effect is the strongest when the cultural friction is at the top management team (TMT) level and the weakest when friction is at the regular employee level. However, this relationship is contingent on factors that work as drags or lubricants for cultural friction between PCNs and host country nationals (HCNs). We identify governance mode and language differences between home and host countries as drag parameters and host country experience and subsidiary interdependence as lubricants that condition the effect of cultural friction on subsidiary performance. Empirical findings based on a longitudinal sample of 7,495 foreign subsidiary observations of 467 Korean MNEs in 63 countries during 1990–2014 provide robust support for our theoretical predictions. [ABSTRACT FROM AUTHOR]

As the COVID-19 situation changes because of emerging variants and updated vaccines, an elaborate mathematical model is essential in crafting proactive and effective control strategies. We propose a COVID-19 mathematical model considering variants, booster shots, waning, and antiviral drugs. We quantify the effects of social distancing in the Republic of Korea by estimating the reduction in transmission induced by government policies from February 26, 2021 to February 3, 2022. Simulations show that the next epidemic peak can be estimated by investigating the effects of waning immunity. This research emphasizes that booster vaccination should be administered right before the next epidemic wave, which follows the increasing waned population. Policymakers are recommended to monitor the waning population immunity using mathematical models or other predictive methods. Moreover, our simulations considering a new variant's transmissibility, severity, and vaccine evasion suggest intervention measures that can reduce the severity of COVID-19. [ABSTRACT FROM AUTHOR]

The aim of this qualitative study was to examine the process of surviving child abuse in people with a mental illness in order to develop an explanatory theory. The study utilized the grounded theory approach. Seventeen community-dwelling adults with a mental illness who had experienced child abuse were interviewed. For the in-depth interview, the lifeline interview method was used. Data were collected from July 14, 2019, to February 28, 2020. The constant comparative method was used for analysis, to identify similarities and differences between different statements, and similar phenomena or theories were compared and analyzed continuously. The central phenomena were "losing oneself" and "in a precarious state." Participants used "expressing," "standing on one's own feet," and "avoiding" as coping strategies. Observed outcomes were "making life work for them" and "living with others." The core category was "losing myself, embracing myself as someone in a precarious state, and being reborn as the master of my life." Positive religious coping, having a supportive network, and emotional or physical distance from difficult situations played a major role in surviving participants' experiences of child abuse and being victimized because of their mental illness. Our findings provide a theoretical basis for understanding people with mental illness who have survived child abuse, and suggest that opportunities for sharing their stories, facilitating self-reliance, and avoiding the causes of their difficulties all play a role in their healing process. Based on this study, it is expected that clinical experts and policy developers will be able to formulate evidence-based interventions and policies. [ABSTRACT FROM AUTHOR]

In this paper, three different rheological models including a newly developed formulation based on the current Christensen Anderson and Marateanu (CAM) model, named sigmoidal CAM model (SCM), are used to estimate the evolution of roughness, rutting, and reflective cracking in a typical composite pavement structure currently widely adopted in South Korea. Three different asphalt mixtures were prepared and dynamic modulus tests were performed. Then, the mechanistic-empirical pavement design guide (MEPDG) was used for predicting the progression of the pavement distress and to estimate the effect of the three different models on such phenomena. It is found that the three different mathematical models provide lower and upper limits for roughness, rutting, and reflective cracking. While the CAM model may not be entirely reliable due to its inability in fitting the data in the high-temperature domain, SCM might result in moderately more conservative pavement design. [ABSTRACT FROM AUTHOR]

Purpose: This study aimed to develop a test scale to measure the character qualities of medical students as a follow-up study on the 8 core character qualities revealed in a previous report. Methods: In total, 160 preliminary items were developed to measure 8 core character qualities. Twenty questions were assigned to each quality, and a questionnaire survey was conducted among 856 students in 5 medical schools in Korea. Using the partial credit model, polytomous item response theory analysis was carried out to analyze the goodness-of-fit, followed by exploratory factor analysis. Finally, confirmatory factor and reliability analyses were conducted with the final selected items. Results: The preliminary items for the 8 core character qualities were administered to the participants. Data from 767 students were included in the final analysis. Of the 160 preliminary items, 25 were removed by classical test theory analysis and 17 more by polytomous item response theory assessment. A total of 118 items and sub-factors were selected for exploratory factor analysis. Finally, 79 items were selected, and the validity and reliability were confirmed through confirmatory factor analysis and intra-item relevance analysis. Conclusion: The character qualities test scale developed through this study can be used to measure the character qualities corresponding to the educational goals and visions of individual medical schools in Korea. Furthermore, this measurement tool can serve as primary data for developing character qualities tools tailored to each medical school's vision and educational goals. [ABSTRACT FROM AUTHOR]

Purpose: This study aimed to identify factors affecting the mental health status of children from multicultural families in South Korea. Methods: This study was based on Dahlgren and Whitehead's (1991) rainbow model as a conceptual framework and used data from the second phase of the multicultural adolescents panel study conducted by the National Youth Policy Institute. Multiple logistic regression analysis was performed using SPSS version 26.0, with p<.05 considered to indicate statistical significance. Results: In the final model, stress (odds ratio [OR]=0.53, p<.001), life satisfaction (OR=2.09, p=.004), self-esteem (OR=1.73, p=.032), and peer support (OR=1.46, p=.019) affected the mental health status of children from multicultural families. The living and working conditions and general socioeconomic, cultural, and environmental conditions did not significantly influence the mental health status of children from multicultural families in the final model. Conclusion: As components of Dahlgren and Whitehead's model, individual hereditary and lifestyle factors, as well as social and community networks, affected the mental health status of children from multicultural families. Therefore, in order to improve the mental health of children from multicultural families, efforts are needed to alleviate their stress, increase life satisfaction and self-esteem, and strengthen their social support. [ABSTRACT FROM AUTHOR]

Purpose: The purpose of this paper was to discuss the need for translation studies in dementia care and current translational endeavors, and to provide recommendations for evolving evidence-based dementia care. Methods: A literature review yielded current evidence and translational efforts. Results: Dementia care interventions need to be implemented at various service levels. Barriers to translation include evidence gaps, lack of the use of a conceptual framework to explain the implementation process, and unsupportive funding mechanisms for applying innovations. Conclusion: There is clear evidence of the need for and benefits of evidence-based dementia care for patients with dementia, family caregivers, and care professionals. The urgent need now is finding ways to advance translational activities and facilitate future research into translation science. [ABSTRACT FROM AUTHOR]

There have been major changes in flow pattern in the Youngsan River due to construction in-stream structures including newly built Seungchon Weir and Juksan Weir in the middle of the river in addition to existing estuarine dam. Increased nutrient load from basin area has been a major cause of repetitive algal blooms in the river. And increased residence time due to the construction may affect growth dynamics of phytoplankton in the river. This paper reports the construction of a mathematical model to predict phytoplankton dynamics in the area for evaluation of various future management scenarios. The Environmental Fluid Dynamics Code model was chosen as a three-dimensional hydrodynamics and water quality model. Hydrodynamics model and water quality model were successfully calibrated using observed water level data and water quality data, respectively, in selected locations in the river. It is expected that the developed model can be successfully applied to select appropriate water quality management alternatives. [ABSTRACT FROM PUBLISHER]

Yoon, J. J., 2014. Non-hydrostatic modeling of wave transformation and rip current circulation: a case study for Haeundae Beach, Korea. Haeundae Beach in Busan, South Korea, is one of the most popular destinations in South Korea, but poses the danger of irregular, fast moving rip currents. To investigate the dominant mechanism of rip currents in this region, a numerical simulation was carried out using the non-hydrostatic model Surface WAves till SHore (SWASH), with observed wave and topographical data. In this paper, the applicability of SWASH for modeling the wave transformation and rip current circulation near the shallow foreshore is investigated. Assuming that rip current dynamics are controlled by combination of variations in wave dissipation and morphological flow constriction, we tested the effects of wave parameters, such as wave heights, wave periods, wave directions, and changes in tidal conditions, on rip current generation. The model results showed good agreement with previous studies, as well as observations in this region. A numerical study showed that wave refraction by spatial topographical characteristics (several submerged reefs near the coasts) of Haeundae Beach cause wave energy propagation in different directions towards the beach. Rip currents were simulated when longshore currents flowed out through a channel with very small wave energy in the seaward direction. The occurrence of rip currents was increased under conditions of higher waves and longer wave periods. In the case of wave direction, we tested cases from SSW to SSE, and present the spatial characteristics of the simulation results. The locations of rip channels that generate rip current are significantly affected by incident wave conditions, such as wave direction, height, and period. [ABSTRACT FROM AUTHOR]

Traffic congestion in isolated complex networks has been investigated extensively over the last decade. Coupled network models have recently been developed to facilitate further understanding of real complex systems. Analysis of traffic congestion in coupled complex networks, however, is still relatively unexplored. In this paper, we try to explore the effect of interconnections on traffic congestion in interconnected Barabási-Albert scale-free networks. We find that assortative coupling can alleviate traffic congestion more readily than disassortative and random coupling when the node processing capacity is allocated based on node usage probability. Furthermore, the optimal coupling probability can be found for assortative coupling. However, three types of coupling preferences achieve similar traffic performance if all nodes share the same processing capacity. We analyze interconnected Internet autonomous-system-level graphs of South Korea and Japan and obtain similar results. Some practical suggestions are presented to optimize such real-world interconnected networks accordingly. [ABSTRACT FROM AUTHOR]

Online sexism against female gamers is reportedly common and pervasive, causing serious problems. To help solve these problems, the study identified various predictors of online game sexism, which is hypothesised to predict actual in-game harassment. Different from previous studies, the study approaches the problems from the perspective of perpetrators rather than victims. We proposed a theoretical model that include three groups of predictors: offline sexist beliefs (masculine norms and hostile sexism), game-related factors (perceived territoriality, advancement, and competition), and environmental factors (peer harassment and play time). The model was tested against online survey data collected from a sample of 528 male gamers in South Korea with age range of 14–64 years (M = 34.70, SD = 12.81). The results showed that all the predictors, except competition and play time, were significantly associated with online game sexism, which mediated the relationships between the predictors and online sexual harassment. Perceived territoriality and peer harassment were found to have direct and positive effects on harassment. The findings are expected to contribute to developing more effective measures for preventing the hostility and aggression against female gamers by providing a new and more thorough diagnosis of the underlying causes of the problems. [ABSTRACT FROM AUTHOR]

Abstract: The purpose of the current paper is to develop a theoretical model that identifies why people blog personal content and explains the effects of blogging in “real life.” Data from an online survey are analyzed using maximum likelihood procedures in LISREL 8.75 to test the structural model. Among 531 respondents from Cyworld, a popular social network and blogging site in South Korea, a randomly selected group of 251 users was used to develop the model. The other group of 280 users was used to confirm the usefulness of the revised model. Results (N =251; N =280) showed that impression management and voyeuristic surveillance are two major psychological factors that motivate individuals to post and read messages on personal blogs. Results also showed evidence for blogging’s real life consequences, measured by users’ perceived social support, loneliness, belonging, and subjective well-being. [Copyright &y& Elsevier]

Purpose: Cost-benefit analysis is one of the most commonly used economic evaluation methods, which helps to inform the economic value of a program to decision makers. However, the selection of a correct benefit estimation method remains critical for accurate cost-benefit analysis. This paper compared benefit estimations among three different benefit estimation models. Methods: Data from community-based chronic hypertension management programs in a city in South Korea were used. Three different benefit estimation methods were compared. The first was a standard deterministic estimation model; second, a repeated-measures deterministic estimation model; and third, a transitional probability estimation model. Results: The estimated net benefit of the three different methods were $1,273.01, $-3,749.42, and $-5,122.55 respectively. Conclusion: The transitional probability estimation model showed the most correct and realistic benefit estimation, as it traced possible paths of changing status between time points and it accounted for both positive and negative benefits. [ABSTRACT FROM AUTHOR]

Yoo H, Kim CJ, Jang Y, You M-A. International Journal of Nursing Practice 2011; 17: 599-606 Self-efficacy associated with self-management behaviours and health status of South Koreans with chronic diseases Although prior research in Western societies has revealed an association between self-efficacy and both self-management behaviours and better health status, little is known about the applicability of this association in Korean populations. We examined the differences in self-management behaviours and health status among three groups according to the level of self-efficacy (high, moderate and low). We used a descriptive and correlational design, and administrated a questionnaire to 322 Korean patients with diabetes mellitus, hypertension or arthritis at three ambulatory clinics in a university medical centre. We performed the Pearson chi-square test to test for differences in proportions, and the Kruskall-Wallis and Mann-Whitney U-tests for non-parametric measures. The level of self-efficacy was associated with self-management behaviours ( P < 0.05) and with better health status indices ( P < 0.001) except fatigue ( P < 0.277). The mean age (Mean ± standard deviation, 53.71 ± 12.60), the percentage of high level of education (62.4%) and the level of employment (51.4%) were significantly higher in high self-efficacy group than in low self-efficacy group or moderate self-efficacy group. Further study of the potential factors affecting any relationship between self-efficacy and fatigue is recommended. Self-efficacy-enhancing interventions can be beneficial for Korean chronic patients to improve their self-management behaviours and health status. [ABSTRACT FROM AUTHOR]

Abstract: The aim of this paper is to present and test a model of innovativeness improvement based on the impact of organizational learning culture. The concept of organizational learning culture (OLC) is presented and defined as a set of norms and values about the functioning of an organization. They should support systematic, in-depth approaches aimed at achieving higher-level organizational learning. The elements of an organizational learning process that we use are information acquisition, information interpretation, and behavioral and cognitive changes. Within the competing values framework OLC covers some aspects of all four different types of cultures: group, developmental, hierarchical, and rational. Constructs comprising innovativeness are innovative culture and innovations, which are made of technical (product and service) and administrative (process) innovations. We use data from 201 Korean companies employing more than 50 people. The impact of OLC on innovations empirically tested via structural equation modeling (SEM). The results show that OLC has a very strong positive direct effect on innovations as well as moderate positive indirect impact via innovative culture. [Copyright &y& Elsevier]

In this paper, we have estimated vector autoregression (VAR), Bayesian vector autoregression (BVAR) and vector error-correction models (VECMs) using annual time-series data of South Korea for 1950-94. We find evidence supporting the view that growth of real per-capita income has been aided by income, investment and export growth, as well as government spending and exchange rate policies. The VECMs provide better forecasts of growth than do the VAR and BVAR models for both short-term and long-term predictions. [ABSTRACT FROM AUTHOR]

Background: The reproduction number is one of the most crucial parameters in determining disease dynamics, providing a summary measure of the transmission potential. However, estimating this value is particularly challenging owing to the characteristics of epidemic data, including non-reproducibility and incompleteness.Methods: In this study, we propose mathematical models with different population structures; each of these models can produce data on the number of cases of the influenza A(H1N1)pdm09 epidemic in South Korea. These structured models incorporating the heterogeneity of age and region are used to estimate the reproduction numbers at various terminal times. Subsequently, the age- and region-specific reproduction numbers are also computed to analyze the differences illustrated in the incidence data.Results: Incorporation of the age-structure or region-structure allows for robust estimation of parameters, while the basic SIR model provides estimated values beyond the reasonable range with severe fluctuation. The estimated duration of infectious period using age-structured model is around 3.8 and the reproduction number was estimated to be 1.6. The estimated duration of infectious period using region-structured model is around 2.1 and the reproduction number was estimated to be 1.4. The estimated age- and region-specific reproduction numbers are consistent with cumulative incidence for corresponding groups.Conclusions: Numerical results reveal that the introduction of heterogeneity into the population to represent the general characteristics of dynamics is essential for the robust estimation of parameters. [ABSTRACT FROM AUTHOR]

In this article, the research targeted middle‐aged wives who had been reported to be most dissatisfied with their marriage lives in the entire sex/generation groups in Japan and South Korea. As an exploratory study, the relationships between self‐construals (subjective, objective, and autonomous selves) and marital conflict resolution strategies (avoiding, dominating, yielding, and integrating) and those between the strategies and marital satisfaction were investigated. The model across the variables (taking the obliging and dominating strategies only) was constructed as well. Several important findings were revealed. First, subjective self and autonomous self were strongly and positively correlated and stronger in South Korea. Second, the Japanese had out‐of‐speculation relationships between self‐construals and marital resolution strategies. Third, the positive associations of integrating/obliging and marital satisfaction and the negative association of avoiding and marital satisfaction were validated in Japan and South Korea. [ABSTRACT FROM AUTHOR]

The current global health emergency triggered by the pandemic COVID-19 is one of the greatest challenges we face in this generation. Computational simulations have played an important role to predict the development of the current pandemic. Such simulations enable early indications on the future projections of the pandemic and is useful to estimate the efficiency of control action in the battle against the SARS-CoV-2 virus. The SEIR model is a well-known method used in computational simulations of infectious viral diseases and it has been widely used to model other epidemics such as Ebola, SARS, MERS, and influenza A. This paper presents a modified SEIRS model with additional exit conditions in the form of death rates and resusceptibility, where we can tune the exit conditions in the model to extend prediction on the current projections of the pandemic into three possible outcomes; death, recovery, and recovery with a possibility of resusceptibility. The model also considers specific information such as ageing factor of the population, time delay on the development of the pandemic due to control action measures, as well as resusceptibility with temporal immune response. Owing to huge variations in clinical symptoms exhibited by COVID-19, the proposed model aims to reflect better on the current scenario and case data reported, such that the spread of the disease and the efficiency of the control action taken can be better understood. The model is verified using two case studies based on the real-world data in South Korea and Northern Ireland. • Realistic modelling and prediction of COVID-19 transmission using modified SEIRS. • Model is robust with considerations for ageing population and time delay factors. • Prediction of R 0 after intervention to measure its efficiency to flatten the curve. • Model verified using real-world data from South Korea and Northern Ireland. • Design and development of open-source simulation package using MATLAB/Simulink. [ABSTRACT FROM AUTHOR]

Novel coronavirus (named SARS-CoV-2) can spread widely in confined settings including hospitals, cruise ships, prisons, and places of worship. In particular, a healthcare-associated outbreak could become the epicenter of coronavirus disease (COVID-19). This study aimed to evaluate the effects of different intervention strategies on the hospital outbreak within a tertiary hospital. A mathematical model was developed for the COVID-19 transmission within a 2500-bed tertiary hospital of South Korea. The SEIR (susceptible-exposed-infectious-recovered) model with a compartment of doctor, nurse, patient, and caregiver was constructed. The effects of different intervention strategies such as front door screening, quarantine unit for newly admitted patients, early testing of suspected infected people, and personal protective equipment for both medical staff and visitors were evaluated. The model suggested that the early testing (within eight hours) of infected cases and monitoring the quarantine ward for newly hospitalized patients are effective measures for decreasing the incidence of COVID-19 within a hospital (81.3% and 70% decrease of number of incident cases, respectively, during 60 days). Front door screening for detecting suspected cases had only 42% effectiveness. Screening for prohibiting the admission of COVID-19 patients was more effective than the measures for patients before emergency room or outpatient clinic. This model suggests that under the assumed conditions, some effective measures have a great influence on the incidence of COVID-19 within a hospital. The implementation of the preventive measures could reduce the size of a hospital outbreak. [ABSTRACT FROM AUTHOR]