• Economic Analysis
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• v.17 no.4
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• pp.30-51
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• 2011

Since the previous studies on the effects of trade liberalization implicitly assume that trade liberalization affects economic performance only in any point in time, they inevitably are static. Static evaluations fail to account for cumulative dynamic effects of trade liberalization that affect continuously economic performance. This paper tries to fill this gap of the previous studies in this field, estimating cumulative effects of trade liberalization on economic performance by employing an dynamic version of empirical model. One of important empirical issue is controlling bias from endogeneity. To resolve this problem, this paper employes system GMM that uses lagged first-differences as instruments for level equations and lagged levels as instruments for first-differences equations. It improves upon cross-section estimators because it controls for the potential bias induced by the omission of industry-specific effects and the endogeneity of all regressors. This study investigates the effects of trade liberalization in Korean manufacturing for the period from 1988 to 2005 and finds that cumulative dynamic effects of trade liberalization are present and bigger than static effects.

• Journal of the Health Care and Life Science
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• v.11 no.2
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• pp.381-391
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• 2023

This study analyzed the perception of equality of opportunity among young people in Korean society using data from the 1st, 2nd, and 4th supplementary surveys of the Korea Education and Employment Panel II (KEEP II). The direction of analysis is to explore whether family background and academic activities (career maturity, academic achievement) during high school, economic situation, social relationships, and level of personal competency during adolescence are linked to the perception of equal opportunity. The analysis method established a structural equation model with the perception of equality of opportunity as the final dependent variable and confirmed the causal relationship using the LISREL program. As a result of the analysis, it was confirmed that the factors affecting young people's perception of equality of opportunity are the economic situation at the time of youth and the level of personal competency. The results of the study confirm the awareness of equality of opportunity among young people entering Korean society, and are expected to be used as information needed to create a social foundation so that they can play a responsible role as members of society.

• Korean Journal of Agricultural and Forest Meteorology
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• v.24 no.4
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• pp.285-294
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• 2022

In order to accurately calculate greenhouse gas emissions in the agricultural field, Korea has been developing national-specific emission factors through direct measurement of gas fluxes using the closed-chamber method. In the rice paddy, only national-specific emission factors for methane (CH₄) have been developed. It is thus necessary to develop those for nitrous oxide (N₂O) affected by the application of nitrogen fertilizer. However, since the concentration of N₂O emission from rice cultivation is very low, the QA/QC methods such as method detection and practical quantification limits are important. In this study, N₂O emission from a rice paddy was evaluated affected by the amount of nitrogen fertilizer, by taking into account both method detection and practical quantification limits for N₂O concentration. The N₂O emission from a rice paddy soils affected by the nitrogen fertilizer application was estimated in the following order. The method detection limit (MDL) of N₂O concentration was calculated at 95% confidence level based on the pooled standard deviation of concentration data sets using a standard gas with 98 nmol mol^-1 N₂O 10 times for 3 days. The practical quantification limit (PQL) of the N₂O concentration is estimated by multiplying 10 to the pooled standard deviation. For the N₂O flux data measured during the rice cultivation period in 2021, the MDL and PQL of N₂O concentration were 18 nmol mol^-1 and 87 nmol mol^-1, respectively. The measured values above the PQL were merely about 12% of the total data. The cumulative N₂O emission estimated based on the MDL and PQL was higher than the cumulative emission without nitrogen fertilizer application. This research would contribute to improving the reliability in quantification of the N₂O flux data for accurate estimates of greenhouse gas emissions and uncertainties.

• International Commerce and Information Review
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• v.15 no.3
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• pp.3-24
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• 2013

This study has examined the relationship between entrepreneurial orientation(EO), dynamic capability(DC) and export performance of international new ventures(INVs). Also, the moderating effect of external environment factors(the hostility at domestic markets and the industrial dynamics) were analysed. Empirical analysis was performed on 101 INVs. It was conducted using the PLS(Partial Least Square). The result of empirical analysis showed that there is a positive relationship between EO, DC and export performance. The result of moderating effect showed that two external environment factors have positive moderating effect on the relationship between EO and DC. However, there was not moderating effect of external environment factors on the relationship between DC and export performance.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.6
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• pp.53-60
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• 2016

This study examined the data from 300 Daejeon and Chungnam Province's lifelong educators to establish the mediated effects of emotional intelligence on job performance and the influential relation between them. A research model and hypothesis was conducted from preliminary research, and the main data was brought into statistical analysis with the SPSS 20.0. The statistical analysis was divided into frequency, primary factors, and reliability; the tools used were the Varimax rotation factor analysis, and Cronbach's alpha coefficient. The analysis was also performed using the Pearson correlation coefficient, where the hypothesis was proven through regression analysis. The results showed that first, emotional intelligence and all of its sub factors have a positive influence on job performance. Second, job satisfaction, a factor shown in emotional intelligence and job performance, appeared to have mediating effects on self-awareness, self-management, social recognition, and relationship management. The results suggest that systematic training and development programs for improving emotional intelligence will be needed to build the competence of lifelong educators.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.2
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• pp.195-204
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• 2020

To help solve the problems of how to set the optimal sawing force and the optimal controller parameters for different sawing conditions, a mathematical model of a proposed sawing system was established according to the principle of sawing force control. The conventional PID control method was then used for further research of the closed-loop control of the sawing force. Finally, through simulation and experimental research, the influence rule of the controller parameters and sawing load on the control performance and the relationships between the sawing width and controller parameters (proportion coefficient) and the sawing force setting value were obtained, from which a system scheme for intelligent sawing control of a band sawing machine was proposed. The research shows that the sawing efficiency of the intelligent sawing system was 18.1 (48%) higher than that of the original sawing system when sawing a grooved section sawing material, which verifies the good control effect of the proposed scheme.

• Journal of Korea Water Resources Association
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• v.49 no.8
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• pp.673-683
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• 2016

An Idea to estimate flexible criteria for river water use permits was proposed that takes the spatio-temporal flow variation along the river into account, which was applied to the Keumho River, one of the tributary of the Nakdong River in Korea. This idea implies the temporal division of four periods with different criteria, combining flood/non-flood seasons and irrigation/non-irrigation periods, while a single one has been applied throughout the year in the current practice. Through flow regime analysis of daily natural flow simulations at Dongchon and Seongseo, the control points of the study area, Q355 and 1Q10 for non-flood and non-irrigation period, Q275 for non-flood and irrigation period, Q185 for flood and irrigation period were suggested respectively. So, those values that subtract instream flow were determined as the flexible criteria in each season. From the comparison of current practice and the proposed method, it was estimated that $10.6\;million\;m^3/year$ is available for more water use permits without additional development of water storage. Therefore, it is conceived that flexible criteria for river water use permission suggested in this study can contribute to improve the national policies for more efficient water resources management in the future.

• Journal of the Korean Data and Information Science Society
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• v.26 no.2
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• pp.355-365
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• 2015

As the global climate has dramatically changed over the past decades, there has been active research on evaluating its effects on food security, which has been recognized as one of the most important issues in the field. In this study, we analyzed the impact of the climate change on the Korean agriculture using meta-analysis methods. Especially, our research focus is on estimating the effect of CO2 concentration and two adaptations (planting-date and cultivar adjustments)on rice that accounts for a larger proportion of the Korean domestic agriculture. Unlike traditional general meta-analysis methods that use summary statistics of effects of interest, meta analysis specific to the agriculture literature was conducted by integrating the data on rice yield that were generated under various CO2 emission scenarios and general circulating models of the 6 collected individual studies. As a modeling approach, the rice yield change ratio was set as the dependent variable and the main and interaction effects of CO2 concentration and adaptation were considered as independent variables in a regression model, As a result, CO2 is estimated to have opposite effects on rice yield depending on whether any of the two adaptations is applied or not; decreasing effect without adaptation and increasing effect with adaptation. In addition, it turns out that the cultivar adjustment has a higher increasing effect on rice yield than the planting-date adjustment. The results of the study are expected to be used as basic quantitative data for establishing responsive polices to the future climate changes.

• The Journal of the Korea Contents Association
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• v.18 no.1
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• pp.504-516
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• 2018

Many countries have tried to reform financing systems toward UHC and paid attention to the function of strategic purchasing. This study was performed to examine theoretical foundations and the function of strategic purchasing. And we examined the functions of strategic purchasing in Korea based on the framework proposed by Preker(2005). For this purpose, we reviewed literature related to purchasing. we defined the strategic purchasing as strategic activities to provide health care services people need within a given budget, which is carried out by certain organizations, purchasing organizations. These activities include selecting appropriate providers, designing and operating the payment system, setting the price, and determining the target populations and their needs etc. The relationships among government, purchasers and healthcare providers can be explained by the principal-agent theory. In addition to Preker's framework, we emphasized the importance of the infrastructure such as decision making support systems, information systems, health care resource management systems, or expenditure monitoring systems. The National Health Insurance Service and the Health Insurance Review & Assessment Service play major roles in performing strategic purchasing.

• Journal of Korea Port Economic Association
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• v.25 no.1
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• pp.223-248
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• 2009

The purpose of this empirical study is to examine and explore the relationships between three variables; shipping companies' service quality, customer satisfaction and customer loyalty. Special features of this study could be summarized as following. First, this is empirical study based on market research according to the definition of 'customer' as freight forwarders and actual exporter/importer together contrary to previous studies. Second, to evaluate shipping companies' service quality, 5 components of SERVPERF model was used. Third, to test correlations between 3 variables; service quality, customer satisfactions and customer loyalty, statistical analysis was used with tools of SPSSWIN ver 15.0 and AMOS ver 7.0. For effective study, many thesis have been obtained through literature survey. However, major results were compiled from directly structured questionnaire, which were collected from Korean import/ export companies and freight forwarders.