• 디지털산업정보학회논문지
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• 제14권4호
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• pp.205-218
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• 2018

The purpose of this study is to examine the factors that the characteristics of Protection Motivation Theory affects the addiction of social game users in Korea and then, to verify how these factors make an impact on the addiction through the immersion. The characteristics of protection motivation theory are vulnerability, severity, efficiency, and disability, and we want to study the influence of each characteristic on social game flow and the relationship leading to addiction. The results of this research can be useful for 'social game addiction prevention education'. This study was conducted to survey the users who had experienced using the social game to verify the suggested hypothesis. As the results of the survey, first of all, vulnerability appeared to have a positive effect on the flow. Secondly, severity appeared not to have a positive impact on the flow. Thirdly, efficiency turned out to affect the flow. Fourthly, disability turned out to have a positive impact upon the flow. Lastly, flow was revealed to make a positive impact on the addiction. The results of this study will help to construct the content of 'social game addiction prevention education program'.

• Journal of applied mathematics & informatics
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• 제29권5_6호
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• pp.1583-1602
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• 2011

A special system of partial differential equations (PDEs) occur in a natural way while studying a class of irrotational inviscid fluid flow problems involving infinite channels. Certain aspects of solutions of such PDEs are analyzed in the context of flow problems involving multiple layers of fluids of different constant densities in a channel associated with arbitrary bottom topography. The whole analysis is divided into two parts-part A and part B. In part A the linearized theory is employed along with the standard Fourier analysis to understand such flow problems and physical quantities of interest are derived analytically. In part B, the same set of problems handled in part A are examined in the light of a weakly non-linear theory involving perturbation in terms of a small parameter and it is shown that the original problems can be cast into KdV type of nonlinear PDEs involving the bottom topography occurring in one of the coefficients of these equations. Special cases of bottom topography are worked out in detail and expressions for quantities of physical importance are derived.

• 컴퓨터교육학회논문지
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• 제12권1호
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• pp.15-22
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• 2009

컴퓨터 프로그래밍 언어 학습은 프로그래밍과 디버깅 과정을 통해 컴퓨터 작동원리를 이해할 수 있을 뿐만 아니라, 논리적 사고력, 문제해결력과 같은 고차원적 사고능력을 함양시켜주는 교육적 효과가 있다. 본 연구에서는 프로그래밍 언어 학습에서 학습자들의 내재적인 학습 동기를 유발하고 학습을 지속시키기 위한 방안으로 몰입이론을 적용하였다. 이를 위해 몰입의 구성 요소를 적요한 교수 학습 전략들을 개발한 후, 이것을 WBI로 설계, 구현하였다. 또한, 구현된 WBI를 실제 교수-학습 현장에 적용하여, 학습자의 몰입수준 변화와 학업성취도에 미치는 효과에 대해 검증하였다. 그 결과 몰입이론을 적용한 WBI 학습이 학습 목표의식과 도전감, 구체적인 피드백을 이루어 몰입 수준 향상에 효과적이었으며, 몰입 경험이 학습 결과에 긍정적인 영향을 끼쳐 학업성취도(프로그래밍 능력)의 향상에 효과적이었다.

• 디지털융복합연구
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• 제6권3호
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• pp.13-22
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• 2008

The purpose of this study is to explore 'Flow Experience' of those studying English speaking and listening in the e-Learning environment. The exploration of flow experience in this study is based on the literature research of Csikszentmihalyi's flow models and other studies. There have been many studies on flow experience focusing on arts, leisure and sports in accordance with Csikszentmihalyi's original theory, however, his flow theory has recently been adapted to the educational field. Nonetheless, it is in the e-learning environment, rather than the face-to-face traditional teaming environment, that there is not enough flow state measurement scale. Therefore, it is important to develop as a stepping stone a flow state scale for those who study English speaking and listening by the cyber-native-speaker on e-Learning environment to improve their satisfaction and achievement.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.57.2-57.2
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• 2011

In this study, the effects of shear flows around a 2-dimensional airfoil, S809 on its aerodynamic characteristics were analyzed by CFD simulations. Various parameters including reference inflow velocity, shear rate, angle of attack, and cord length of the airfoil were examined. From the simulation results, several important characteristics were found. Shear rate in a flow makes some changes in the lift coefficient depending on its sign and magnitude but angle of attack does not have a distinguishable influence. Cord length and reference inflow also cause proportional and inversely proportional changes in lift coefficient, respectively. We adopted an analytic expression for the lift coefficient from the thin airfoil theory and proposed a modified form applicable to the traditional load analysis procedure based on the blade element momentum theory. Some preliminary results applied to an well known load simulation software, FAST, are presented.

• Asia pacific journal of information systems
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• 제16권1호
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• pp.45-69
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• 2006

Technology Acceptance Model (TAM) has been widely used to predict user's behavior to accept the technology. Prior researches have been mainly focused on innovation constructs such as perceived usefulness and perceived ease of use. However, very little research has been conducted to understand individual mental beliefs in technology acceptance and imitation influence. This study integrates Technology Acceptance Model (TAM), Flow Theory (FT) and Diffusion of Innovation Theory (DIT). This paper indicates that imitation context, cognitive absorption (CA) based Flow theory and innovation context are the three important factors influencing user acceptance of information technologies. The proposed model has been tested among 232 users of MP3 players. Results showed that innovation context and cognitive absorption have positive influences on intention to use technology. Not all factors of the imitation context have direct effect on intention to use. However, we found that imitation context has positive influence on intention to use technology through cognitive absorption.

• 대한기계학회논문집A
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• 제26권10호
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• pp.1953-1960
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• 2002

The viscoplasticity theory based on overstress, one of the unified state variable theories, is generalized to model zero (no influence of loading rate) and negative (flow stress decreases with loading rate) as well as positive (flow stress increases with loading rate) rate sensitivity in a consistent way. On the basis of the long-time asymptotic solution the different types of rate sensitivity are classified with respect to an augmentation function that is introduced in the evolution law fur a state variable equilibrium stress. The theory predicts normal relaxation and creep behaviors even if unusual rate sensitivity is modeled. The constitutive model fir the behavior of a modified 9Cr-1 Mo steel at various temperatures is then compared with experimental data found in the literature.

• Journal of Mechanical Science and Technology
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• 제19권3호
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• pp.836-845
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• 2005

Atherosclerosis, which is a degenerative vascular disease, is believed to occur in the blood vessels due to deposition of cholesterol or low density lipoprotein (LDL). Atherosclerotic lumen narrowing causes reduction of blood flow due to hemodynamic features. Several hypothetical theories related to the hemodynamic effects have been reported : high shear stress theory, low shear stress theory, high shear stress gradient theory, flow separation and turbulence theory, and high pressure theory. However, no one theory clearly explains, the causes of atherosclerosis. The objective of the present study was to investigate the mechanism of the generation of atherosclerosis. In the study, the database of Korean carotid and coronary arteries for geometrical and hemodynamic clinical data was established. The atherosclerotic sites were predicted by the computer simulations. The results of the computer simulation were compared with the in vivo experimental results, and then the pathogenesis of atherosclerosis by using the clinical data and several hypothetical theories were investigated. From the investigation, it was concluded carefully that the mechanism of the generation of atherosclerosis was related to the hemodynamic effects such as flow separation and oscillatory wall shear stress on the vessel walls.

• 한국게임학회 논문지
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• 제9권3호
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• pp.87-96
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• 2009

몰입이론과 관련된 연구결과에 의하면, 사람들이 어떤 일에 대해 최적의 경험을 하기 위해서 는 도전감(Challenge)과 능력(Skill)이 높았을 때라고 한다. 그렇다면 몰입이론의 능력(Skill)은 무엇을 의미하는가? 본 연구에서는 교육학에서 다루고 있는 자아효능감(Self-Efficacy)이론을 토대로 몰입이론에서 말하는 능력(Skill)에 대해 재해석하고, 실제 자아효능감에 영향을 미치는 게임의 요소와 자아효능감이 몰입의 경험에 미치는 영향을 설문을 통해 분석하였다. 분석결과를 살펴보면, 몰입에서의 능력(Skill)은 주관적 자기 능력의 의미로써 자아효능감과 동일한 개념임을 알 수 있었다. 또한 설문결과 게임의 보상에 대한 형평성과 타인의 긍정적 평가가 자아효능감에 영향을 미치고, 이를 통해 몰입의 경험을 하게 된다는 가설을 검증하였다. 본 연구 결과를 토대로 플레이어에게 몰입의 경험을 높게 제공하기 위해 자아효능감을 어떻게 게임 요소로 활용해야 하는지에 대한 이론적 근거를 제공해 줄 수 있을 것이다.

• International Journal of Fluid Machinery and Systems
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• 제10권2호
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• pp.99-118
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• 2017

ECHO progress was defined to depict the rotordynamic pump theory development. Experience (E) era for pumps lasted nearly one and a half hundred years before the Industrial Revolution due to the low rotation speed of motor and undeveloped manufacture ability. Classic (C) theory referring to quasi-static performance as well as the items those were not able to be steadily resolved under the level were briefly and sophisticated outlined. Since 1962, flow instabilities and the dynamic responses had come into main attention with the development of the modern technologies such as ballistic missile, rocket and space shuttle main engine, and were finally heuristically (H) elucidated by talented scholars and researchers. Recently, new applications for the pumps open (O) to the surrounding fluid and diversity of the medium such as multiphase flow need more studies and some examples were briefly introduced to display the potential problems lastly.