• Journal of Korea Planning Association
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• v.54 no.3
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• pp.15-26
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• 2019

The development of science and transportation technology leads to the increase of inter - city networks that play an important role in urban growth. Overall, numerous studies based on network theory pay attention to positive effects of urban network on urban growth. However, some studies have pointed out the negative effects of inter-city interactions such as straw effects. This implies that the network between cities may not be positively correlated with urban growth, and that the direction of the influence may vary from a certain threshold, such as the marginal utility curve. In this context, the purpose of this study is to measure the impacts of network with central city on urban growth in the capital region and examine the relationship between urban network and growth. Two multiple regression models are employed with changes in population and employment as dependent variables. The urban network index and other control variables are used as independent variables. Especially, the urban network indexes are used in quadratic forms to examine non linear relations with urban growth such U-shape or an inverted U-shape. The results show that the relationships between networks with the central city and urban growth are not a simple linear, and the influence can be changed from the critical point.

• The Journal of the Korea Contents Association
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• v.20 no.6
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• pp.406-414
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• 2020

Exporting plays the important role in reducing dependence on the domestic market by creating the new foreign markets. As a business strategy, exporting contributes to the national growth and provides firms with opportunities which enable economies of scale, economies of scope, and experience curve effects. Because of both the growth limitation of the domestic market and development of information technology, many firms enter in foreign markets by increasing exporting. Using firms located in Taegu, this study examined the factors of firms' exporting with industrial organization theory and strategic perspective. In the empirical results on industrial organization theory, systematic cooperation and governmental supporting positively affect firms' exporting and only systematic cooperation positively affects exporting performance. In the empirical results on strategic perspective, product differentiation foreign exporting network, and foreign entry nation positively affect firms' exporting, and foreign exporting network, and foreign entry nation positively affect exporting performance.

• Journal of applied mathematics & informatics
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• v.34 no.5_6
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• pp.421-434
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• 2016

The main aim of this paper is to discuss the difference between the Euler-Maruyama's approximate solutions and the accurate solution to stochastic differential delay equation. To make the theory more understandable, we impose the non-uniform Lipschitz condition and weakened linear growth condition. Furthermore, we give the pth moment continuous of the approximate solution for the delay equation.

• Korean Journal of Mathematics
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• v.28 no.2
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• pp.295-309
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• 2020

In this paper we study the growth of solutions of some non-linear complex differential equations in connection to Brück conjecture using the theory of complex differential equation.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.8 no.2
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• pp.365-369
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• 1998

Theory of the adsorption by a monolayer is extended to the multiple adsorption layers. Though the model used is extremely simple, the adsorption isotherm thus obtained describes well qualitatively the nature of unsaturation adsorptions such as $Br_2$adsorption by the silica gel.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 1997.03a
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• pp.291-293
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• 1997

The effect of strain accumulation on the superplastic deformation behavior has been investigated through a series of load relaxation tests. The experimental results were analyzed using the recently proposed inelastic constitutive theory. The superplastic deformation of fine grained materials is confirmed to consist of grain boundary sliding and accommodating grain matrix deformation. However the flow behavior is changed with the plastic strain. It is believed that the microstructural changes such as grain growth and cavitation affect the superplastic deformation behaviors.

• Journal of the Korean Chemical Society
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• v.52 no.6
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• pp.608-613
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• 2008

• Korean Journal of Mathematics
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• v.29 no.3
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• pp.473-481
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• 2021

In this paper, we investigate the relations between the growth of meromorphic coefficients and that of meromorphic solutions of complex linear differential-difference equations with meromorphic coefficients of finite logarithmic order. Our results can be viewed as the generalization for both the cases of complex linear differential equations and complex linear difference equations.

• The Journal of Asian Finance, Economics and Business
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• v.8 no.2
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• pp.353-364
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• 2021

Originating in value congruence theory, this study aims to give a clear understanding of the transformation process of consumers from incumbent technology to disruptive innovation technology. Moreover, the moderating effect of personal innovativeness in the process of consumers' switching to disruptive innovation is investigated. This study combines value congruence with expectation-disconfirmation theory, technology-switching theory, and the personal innovativeness of the disruptive innovation product, explaining why consumers have transformed from an incumbent product into a disruptive innovation. Data was collected through a questionnaire from 280 smartphone users in China. The respondents were mainly potential consumers who had never bought Redmi phones, namely, a smart product owned by the renowned Chinese company Xiaomi. The hypothesis of the research model is based on the example of the Redmi smartphone, which has been confirmed by existing smartphone users in China. Through investigation, the results of multivariable regression analysis show the decisive variables that influence consumer intentions, and we analyze the role of personal innovativeness in moderating between dissatisfaction with the incumbent product and purchase intention of a product based on disruptive innovation. The findings of this study can provide a certain reference for the sustainable growth of Xiaomi and the development of new products.

• The Journal of Korean Medical History
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• v.34 no.1
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• pp.59-74
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• 2021

Li Gao left a great mark in the history of Chinese medicine by founding Piwei (脾胃) theory. When explaining Li Gao's medical ideology, researchers explain that his medical ideology was created by curing hunger during wartime and treating diseases of people who suffered from battle field trauma. However, Li Gao also suffered from battlefield trauma for his experience of the Mongol siege of Kaifeng (開封城) from 1232 to 1233. It is the hypothesis of this study that Li Gao himself would have suffered posttraumatic stress disorder (PTSD), and this study reexamines the process more closely from the viewpoint of PTSD and posttraumatic growth (PTG). The conclusion of this study is that his achievement in medical history is a result of his PTG. Li Gao's narrative of Piwei (脾胃) theory contains elements that seek revenge against the Mongol soldiers, and Li Gao achieved extraordinary PTG by overcoming the trauma of the siege of Kaifeng step by step.