• The Journal of Industrial Distribution & Business
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• v.12 no.9
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• pp.31-42
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• 2021

Purpose: After the reform and opening up, China's overall economic development has entered a new era. From mutual investment and trade transactions between domestic provinces and regions to investment and trade with foreign companies, the continuous supplement of investment funds makes the follow-up development of all aspects of economic development smoother and has played a strong impetus. effect. Foreign direct investment has many influences on the economic development of a country or region. Research design, data and methodology: This article uses the sample data of Shandong Province from 2011 to 2019 to analyze the foreign direct investment in Shandong Province by industry, region, method and other aspects, and study the relationship and influence between foreign direct investment and economic growth. Results: The results show that there is a relatively close relationship between foreign direct investment and economic growth, and it has played a role in promoting economic development in many aspects such as industrial structure, foreign trade, and employment. Conclusions: At the same time, corresponding suggestions are put forward based on the analysis and conclusions drawn.

• Journal of the Korean Society of Industry Convergence
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• v.27 no.3
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• pp.709-725
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• 2024

This study utilized the raw data from the Community Health Survey (2023) to compare differences in body function, activity, participation, environment, personal factors, and suicidal ideations between elderly individuals aged 65 and older living alone and those living with families in Korea. The study subjects consisted of 80,618 elderly individuals aged 65 and older. Cross-tabulation analysis χ²-test), independent sample t-test, and logistic regression analysis were conducted. The results indicated that for both elderly individuals living alone and those living with families, age(p<.001), smoking(p<.001), stress(p<.001), depression experience(p<.001), and falls experiences(p<.001) were risk factors that increased suicidal ideations. Conversely, educational level(p<.05), income level(p<.001), subjective health status(p<.001), social participation(p<.001), economic activity(p<.001), community environment(p<.001), and social relationships were protective factors that reduced suicidal ideations. These findings demonstrate that demographic characteristics and individual health status significantly influence suicidal ideation in the elderly, while social factors contribute to a decrease in suicidal ideation. Furthermore, considering the differences found between elderly individuals living alone and those living with families regarding hypertension and gender, differentiated interventions for suicide prevention are necessary.

• Korean Journal of Health Education and Promotion
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• v.25 no.3
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• pp.21-43
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• 2008

Objective: This study aimed to understand workplace drinking environment on drinking behaviors among female employees and thereby attempt to lay a ground for future prevention of drinking problems triggered by workplace environment. For the purposes of the study, variables related to drinking behavior and the actual conditions of female employees were explored. And the study examined the effects of individual and environmental factors on drinking behavior. Methods: The sample included 400 female and male employees in enterprises and organizations located in the metropolitan area of Korea. An in-depth interview was conducted to explore workplace variables related to female drinking, and a self-administered questionnaire was conducted to examine the relationship between workplace variables and drinking behaviors (alcohol consumption, risky drinking, and binge drinking frequencies). Results: Major findings of the study are as follows: First, positive function of drinking and drinking culture at workplace and the pressure to drink were derived from in-depth interviews. Second, 47.2% of female employees were current drinkers and 20.4% were risky drinkers. Third, drinking norms and attitude at workplace, influence of peer group, and drinking culture at workplace were found to be predictive factors of harmful drinking. Fourth, drinking expectancy and drinking norms and attitude at the workplace were found to influence drinking binge frequencies. Conclusion: The study indicates the importance of the workplace environmental factors in female employee's drinking behavior, and addresses the need for interventions geared toward changing the workplace environment regarding alcohol use.

• Journal of Computational Design and Engineering
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• v.3 no.3
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• pp.179-190
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• 2016

A kind of modified epoxy resin sheet molding compounds of the impeller has been designed. Through the test, the non-metal impeller has a better environmental aging performance, but must do the waterproof processing design. In order to improve the stability of the impeller vibration design, the influence of uncertainty factors is considered, and a multi-objective robust optimization method is proposed to reduce the weight of the impeller. Firstly, based on the fluid-structure interaction, the analysis model of the impeller vibration is constructed. Secondly, the optimal approximate model of the impeller is constructed by using the Latin hypercube and radial basis function, and the fitting and optimization accuracy of the approximate model is improved by increasing the sample points. Finally, the micro multi-objective genetic algorithm is applied to the robust optimization of approximate model, and the Monte Carlo simulation and Sobol sampling techniques are used for reliability analysis. By comparing the results of the deterministic, different sigma levels and different materials, the multi-objective optimization of the SMC molding impeller can meet the requirements of engineering stability and lightweight. And the effectiveness of the proposed multi-objective robust optimization method is verified by the error analysis. After the SMC molding and the robust optimization of the impeller, the optimized rate reached 42.5%, which greatly improved the economic benefit, and greatly reduce the vibration of the ventilation system.

• The Journal of the Korea Contents Association
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• v.16 no.3
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• pp.439-446
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• 2016

This research examines the effect of outside director system which has been legislated after financial crisis in Korea. Outside director system is based on agency theory which assumes that a manager is selfish and opportunistic in situation where ownership and management of a firm is separated. In this situation, outside director system has an important function to monitor and keep in check a manager. Thus, we examined that outside director system works as a monitoring mechanism in Korea. And we tested that above effect is weakened in family CEO firms where it is different from assumption of agency theory in Korea. According to empirical result with 282 sample firm, it is confirmed that outside director system reduces agency cost. In family CEO firms, however, this agency cost-reducing effect becomes weak. This result suggests that outside director system needs be cautiously managed without focusing on only monitoring function.

• 한국노년학
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• v.31 no.2
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• pp.305-319
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• 2011

The purpose of this study is to propose a theoretical model for understanding how marital satisfaction and depression may impact on suicide ideation of older people. This study was also focused on the mediating effect of depression. To achieve this purpose, a survey was conducted, and this sample was based on 194 older people aged over 65 living in Jeollabuk-Do, who had been participating in senior centers or in home care centers. A sampling method was the quota sampling using face to face interview, and an analysis method was the structural equation modeling. The main results testified by this study are as follows; First, the negative function of marital satisfaction had direct effect on the suicidal ideation and depression, while the positive function of depression had direct impacts on the suicidal ideation. Second, the depression mediated partially the association between marital satisfaction and suicidal ideation. This study theoretically contributes to the existing literatures documenting the impact of marital satisfaction on older people' suicide ideation. Not only that, but this study suggests practical and politic implication through these results.

• Bulletin of the Society of Naval Architects of Korea
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• v.27 no.2
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• pp.1-12
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• 1990

Interactions between a propeller and vortex system contained in a ship stern flow is treated theoretically. A new formulation to determine the effective velocity distributions is developed, which may be immediately applicable to the design and analysis of compound propulsors under the influence of severe vortical cross-flows around ship stern. An axisymmetric shear flow is represented by a system of ring vortices and the axial variation of the stream lines due to the action of propeller is represented by a cubic function. The strengths of ring vortices, which are varying along the stream lines, are determined by the conservation of angular momentum. Two simplified effective velocity models are proposed to confirm the theory. Sample calculations using the simplified models are made to compare with the results by other investigators.

• Publications of The Korean Astronomical Society
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• v.32 no.1
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• pp.239-244
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• 2017

How does the presence of an AGN influence the total SFR estimates of galaxies and change their distribution with respect to the Galaxy Main Sequence? To contribute to solving this question, we study a sample of 1133 sources detected in the North Ecliptic Pole field (NEP) by AKARI and Herschel. We create a multi-wavelength dataset for these galaxies and we fit their multi-wavelength Spectral Energy Distribution (SED) using the whole spectral regime (from 0.1 to $500{\mu}m$). We perform the fit using three procedures: LePhare and two optimised codes for identifying AGN tracers from the SED analysis. In this work we present an overview of the comparison between the estimates of the Infrared bolometric luminosities (between 8 and $1000{\mu}m$) and the AGN fractions obtained exploiting these different procedures. In particular, by estimating the AGN contribution in four different wavelength ranges ($5-40{\mu}m$, $10-20{\mu}m$, $20-40{\mu}m$ and $8-1000{\mu}m$) we show how the presence of an AGN affects the PAH emission by suppressing the ratio $\frac{L_{8{\mu}m}}{L_{4.5{\mu}m}}$ as a function of the considered wavelength range.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.1 no.2
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• pp.74-81
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• 1987

The reduction in dielectric strength of insulating polymer material when applying electric field is known to be substantial due to the trapped carrier effect. In this study, the carrier property of Biaxially-Drawn polypropylene, which has superior heat-resistance compared to ordinary one, is examined to improve electrical characteristics by measuring TSC spectra as a function of electric field applied to a sample of ($50{\mu}m$) thickness film. The TSC spectra in the temperature range of 303-413(K) and electric field of 2-80(MV/m) have shown no observable effect below 12(MV 1m) but TSC currents of Hetero-and Homo-peaks formed from trapped space charger and space charger injected from electrode have been observed above that point, which seems eventually lead to dielectric breakdown. Finally, this study has shown the superior dielectric proporty of Biaxially-Drawn polypropylene film compared to the non-oriented one for electrical insulation.

• The Bulletin of The Korean Astronomical Society
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• v.41 no.2
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• pp.55.5-56
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• 2016

Turbulence plays an important role in molecular clouds. However, the properties of turbulence are poorly understood. In order to study the influence of turbulence in molecular clouds, we need to sample the turbulent properties in the full range of scales down to sonic scale. We mapped the $20^{\prime}{\times}60^{\prime}$ area covering the Orion Molecular Cloud (OMC) 1-4 region in HCN 1-0 and HCO+ 1-0 with Taeduk Radio Astronomy Observatory (TRAO) 14-m telescope as part of the TRAO key science program, "Mapping turbulent properties of star-forming molecular clouds down to the sonic scale (PI: Jeong-Eun Lee)". In addition, we combine our TRAO data with other molecular line maps ($^{13}CO$ 1-0, $C^{18}O$ 1-0, CS 1-0, $N_2H^+$ 1-0) obtained with the Nobeyama Radio Observatory (NRO) 45-m telescope. To analyze these data, we apply statistical methods, the principal component analysis (PCA) and spectral correlation function (SCF), which are known to be useful to study underlying turbulent properties and to quantitatively characterize cloud structure. We will present the preliminary results of observations and analyses.