• 대한기계학회논문집
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• 제18권3호
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• pp.573-583
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• 1994

In this study, the shock characteristics for high velocity impact phenomena during the initial shock state by the long rod penetrator are calculated. From these results we re-analyze the one-dimensional hydrodynamic penetration theory by introducing the effective area ratio calculated from the mushroomed strain which is dependent on impact velocity. Calculated penetration depth and mushroomed strain show good agreement with high velocity impact experimental data. In addition we visualize the shock wave propagation in a transparent acryle block.

• 아태비즈니스연구
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• 제3권2호
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• pp.8-15
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• 2012

Mobile Entertainment is the new era in mobile communication. Mobile Entertainment service is a combination of games, music, videos, chatting and telecommunication which has created a wide market in India. There is a variation between male and female customers towards Mobile Entertainment services. This study is aimed at analyzing gender impact of attitude, subjective norm, perceived behaviour control intention and behaviour towards mobile entertainment services. The Theory of planned Behaviour (TPB) provided a framework. Total 566 male and 376 female mobile users of different age groups participated in the research. The data analysis was conducted in three-stages. First, reliability tests were performed. Upon satisfactory results, confirmatory factor analysis (CFA) is used to analysis convergent, concurrent and discriminant validity of the model. Once the model was validated Structural Equation Model (SEM) Multi-group analysis is used to find the impact of gender behaviour towards Mobile entertainment services. The results of the study confirmed that the model is viable in predicting variation in gender impact on mobile entertainment services. The findings have revealed that attitude, perceived behaviour control and intention has a significant impact on behaviour to use mobile entertainment but subjective norm has no significant impact on behaviour to use mobile entertainment.

• 대한조선학회논문집
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• 제36권2호
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• pp.77-93
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• 1999

본 연구에서는 충격횡압력을 받는 선체 판부재의 붕괴강도 특성을 분석하고 충격하중 효과를 고려한 간이 구조설계식을 제시하고자 한다. 충격횡압력하에 판부재의 붕괴거동을 분석하기 위해 기존의 실험결과와 더불어 범용 비선형 유한요소해석 프로그램인 STARDYNE을 이용하였다. 이론적 방법으로는 먼저 강소성이론을 이용하여 정적 횡압력을 받는 판부재에 대한 붕괴강도식을 도출하였다. 또한, 변형률속도 효과를 고려하여 충격 횡압력 문제에도 적용하였다. 실제 판부재에 적용 예로써 충격횡압력을 받는 강판부재와 알루미늄합금 보강판부재에 대한 붕괴거동을 분석하였다.

• ETRI Journal
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• 제36권4호
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• pp.581-590
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• 2014

This study investigates the impact of tweets on box office revenue. Specifically, the study focuses on the times when tweets were written by examining the impact of pre- and post-consumption tweets on box office revenue; an examination that is based on Expectation Confirmation Theory. The study also investigates the impact of intention tweets versus subjective tweets and the impact of negative tweets on box office revenue. Targeting 120 movies released in the US between February and August 2012, this study collected tweet information on a daily basis from two weeks before the opening until the closing and box office revenue information. The results indicate that the disconfirmation that occurs in relation to the total number of pre-consumption tweets for a movie has a negative impact on box office revenue. This premise suggests that the formation of higher expectations of a movie does not always result in positive results in situations where tweets on perceived movie quality after watching spread rapidly. This study also reveals that intention tweets have stronger effects on box office revenue than subjective tweets.

• 기계저널
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• 제16권3호
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• pp.271-276
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• 1976

A theory has been developed for impact heating as well as thermodynamics of impact. The result is very simple and convenient for engineering applications : T=$T(\frac{{V_0}}{V})^{\gamma}$, $where T_0$ and T are the temperatures before and after the impact, $V_0$/ and V the volumes before and after the impact, and $\gamma$ the Gruneisen constant, given in a table in this paper.

• 한국콘텐츠학회논문지
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• 제16권2호
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• pp.480-493
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• 2016

최근 들어 사회적인 상호작용 방식이 동영상을 통해 정보를 주고받는 방식으로 변하고 있다. 그래서 본 연구에서는 '나'와 '다른 사람'의 영상을 구성요소로 하는 새로운 소셜 비디오 플랫폼을 제안하고자 한다. '다른 사람'의 개성(Personality)과 '나'의 개성이 '나'에게 어떤 영향을 주는지 알아보고, 2가지 요소를 어떻게 나타내주어야 하는지 알아보기 위해 사회적 영향 이론(Social Impact Theory)과 자기 점검 이론(Self-Monitoring Theory)을 적용하여 영상을 시청하는 '나'의 개성과 '다른 사람'의 개성이 사용자의 긍정성과 소속감에 어떤 영향을 미치는지 알아보았다. 그리고 이를 실증적으로 검증하기 위해 실제 소셜 비디오 플랫폼을 구축하여 실험을 진행하였다. 그 결과, 사용자들은 자신의 영상이 화면에 제시되었을 때, 긍정성을 더 많이 느끼는 것을 확인하였다. 하지만 자신의 영상이 함께 제시되면서, 주변영상에 나타난 다른 사람들의 모습이 여성성이 높아질수록 오히려 느끼는 긍정성은 줄어드는 것으로 확인되었다. 또한 다른 사람들의 모습이 남성성이 높을 때, 사용자는 소속감을 더 크게 느끼는 것을 확인하였다. 본 연구 결과를 통해 새로운 소셜 비디오 플랫폼의 구성과 형태에 대한 시사점을 제공할 수 있을 것으로 보인다.

• Asia pacific journal of information systems
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• 제23권3호
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• pp.105-129
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• 2013

This study draws important factors in electronic Word-of-Mouth (eWOM) and examines how these influence the building of customer loyalty. eWOM is viewed as social communication between customers and sellers, and thus the communicative action theory is applied. With the theory, we identify reviewer and seller as influential players on customers, and derive important factors such as correctness and veracity of reviews from the reviewers' action, and information compactness and adequacy from the seller's action. We propose these constructs as antecedents of customer loyalty and further hypothesize their curvilinear impacts as follows: the marginal impacts of veracity and correctness will decrease as veracity and correctness increase, and the marginal impacts of compactness and adequacy will increase as compactness and adequacy increase. The result indicates that only the seller's action has a curvilinear impact, whereas the reviewer has proportional positive impact on customer loyalty. This study indentifies important factors in eWOM from a critical social theory perspective and validates them using the positivistic approach. For practitioners, it discusses the important factors in eWOM with the identification of the individuals who are responsible for these factors.

• The Journal of Asian Finance, Economics and Business
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• 제7권12호
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• pp.657-664
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• 2020

We investigate the impact of roads and highways within the provinces on the regional trade of China using the augmented Gravity Model and theory of modeling trade. We take a panel data covering 31 provinces of China over 20 years period (1998-2017) for the estimations. We apply ARMA-OLS model, fixed and random effects, and robust findings by Hausman test. The results imply that road and highway lengths within the provinces have a significantly positive impact on the value of the province-wise exports. The positive impact is due to the fact the increased coverage of roads and highways increase accessibility to resources and mobility of goods and services within the regions. Moreover, employment in the transportation sector, per capita GDP and population of the provinces also illustrate positive and significant influence on regional exports and trade. The impact of China's WTO accession on regional exports has been positive, while the financial crisis has had a negative impact. The year dummies show that, in the years following the financial crisis, China was able to regress from the external shock as trade within the provinces increased. The increase in exports after financial crisis is mainly due to the government policies and support to every province.

• 대한기계학회논문집
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• 제13권4호
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• pp.643-652
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• 1989

본 연구에서는 저자들에 의해 개발된 보와 판의 동적 유한 요소법으로 보형상을 지닌 적층 복합재의 형상비(길이/폭)와 적층 형태의 변화에 따른 충격 해석시 어느 이론의 결과가 더욱 적합한지에 대한 타당성 여부를 검토하고자 한다.

• Structural Engineering and Mechanics
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• 제90권4호
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• pp.357-370
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• 2024

Due to the fact that the mechanism of the effects of temperature and initial geometric imperfection on low-velocity impact problem of axially moving plates is not yet clear, the present paper is to fill the gap. In the present paper, the nonlinear dynamic behavior of axially moving imperfect graphene platelet reinforced metal foams (GPLRMF) plates subjected to lowvelocity impact in thermal environment is analyzed. The equivalent physical parameters of GPLRMF plates are estimated based on the Halpin-Tsai equation and the mixing rule. Combining Kirchhoff plate theory and the modified nonlinear Hertz contact theory, the nonlinear governing equations of GPLRMF plates are derived. Under the condition of simply supported boundary, the nonlinear control equation is discretized with the help of Gallekin method. The correctness of the proposed model is verified by comparison with the existing results. Finally, the time history curves of contact force and transverse center displacement are obtained by using the fourth order Runge-Kutta method. Through detailed parameter research, the effects of graphene platelet (GPL) distribution mode, foam distribution mode, GPL weight fraction, foam coefficient, axial moving speed, prestressing force, temperature changes, damping coefficient, initial geometric defect, radius and initial velocity of the impactor on the nonlinear impact problem are explored. The results indicate that temperature changes and initial geometric imperfections have significant impacts.