• The Journal of Society for e-Business Studies
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• v.25 no.4
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• pp.125-141
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• 2020

Recent Studies emphasize the effect of investors attention, recognition and sentiment on the trading behavior of retail investors and stock price variation. In this study, we use Naver Trend to measure investors'attention and investigate the relation between investor attention and price synchronicity, total risk and systematic risk of stocks. Using various research methodologies such as portfolio analysis, fixed effect regression and dynamic panel analysis, we find consistent results. First, stock price synchronicity is increased with lager average search volume, but with less search variability. Second, both average search volume and its variability are positively related to total risk and beta of stocks. These results can be interpreted that search volume sharply increases only when stock-related event occurs.

• Information and Communications Magazine
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• v.31 no.1
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• pp.71-81
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• 2013

본고에서는 자연계에 존재하는 동조 현상을 이해하고 공학적으로 활용하기 위하여 동조 현상에 관한 대표적인 수학적 모델을 살펴보고 동조의 원리를 분석한다. 또한 동조 현상을 공학적으로 활용한 주요 사례를 살펴봄으로써 자연계를 모방한 동기화 방식의 장단점을 분석하고 자연계 모방 기술의 필요성을 역설한다. 아울러 동조 현상을 공학적으로 활용하는데 필요한 향후 연구 이슈를 제시한다.

• International Area Studies Review
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• v.15 no.3
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• pp.55-76
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• 2011

In this paper, we estimate a model that incorporates key features of business cycles, co-movement among economic variables and switching between regimes of expansion and recession, to aggregate quarterly data for the NAFTA region. Two common factors reflecting the permanent and transitory components of the business cycle in the region, along with the turning points from one regime to the other, were extracted from the data by using the Kalman filter and maximum likelihood estimation approach of Kim (1994). Estimation results confirm that a typical aspect of business cycles are also observed (i.e., recessions are steeper and shorter than recoveries) in the region, and that both co-movement and that regime switching are found to be important features of the business cycle. The two common factors produce sensible representations of the trend and cycle, and the estimated turning points are in line with independently determined chronologies. It also turns out that the degree of synchronization between the NAFTA region and Korea, has significantly increased since the entry into force of the NAFTA.

• Korea Real Estate Review
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• v.24 no.1
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• pp.39-52
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• 2014

This study examines the degree of global co-movement & spillover effect among the housing price of ten major countries of OECD including Korea, based on the 3 hypothesis. The data used in this study is quarterly house price index of OECD countries from 1975 to 2012. VAR model is used to analyze the co-movement, and Granger causality methodology is used for the analysis of Spillover Effect. It is found that entire period of study is that the global house prices showed the co-movement, but the coefficient was weak. Since 2008 global financial crisis, the co-movement increased significantly and the adjusted R-square of this model increased 78% compared to the entire period (1975-2012). In general, all hypotheses in this study were significant, and the common shock hypothesis were most significant. In case of Korea, the degree of co-movement was weak compared to the other countries and spillover effect was independent since 2008.

• The Journal of the Korea Contents Association
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• v.9 no.11
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• pp.376-390
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• 2009

The objective of this study is to examine the factors affecting adolescents' intention to buy e-Learning web site, expecially focuses on the moderating effect of adolescents's conformity. The main results are as follows. First, teacher's ability, personalized service, easy for service search, interaction between students, service revival for joining e-Learning sites affect intention to buy e-Learning web site through perceptual usefulness, except for entertainment. Second, perceptual usefulness has positive effect on intention to buy. Third, According to conformity, personalized service has different effect on perceptual usefulness. The result shows higher in high conformity group than low conformity group. It means e-Learning companies should focus on reference group or special group to effect their marketing strategy on adolescents. Lately, preceded studies investigated using SERVQUAL or SERVERF which were suit to offline. But, this study found e-Learning factors which are suitable to online. So, the factors and the results are more useful to e-Learning companies.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.708-710
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• 2014

최근 금융 분야에서는 빅 데이터를 이용하여 주가예측 모형을 만들어내고 있으며, 특히 금융 시계열 자료의 변동성 집중 현상을 금융 빅 데이터를 이용하여 분석함으로써 세계 주식시장의 동조화 현상을 분석하고 있다. 본 논문에서는 한국과 중국의 일별 주가지수수익률과 일중 주가지수수익률을 이용하여 이들 2개 국가의 대표적인 주가지수 시계열 데이터에 변동성 집중 현상이 존재하는지를 보다 세밀하게 추적하여 양국 주식시장의 동조화 현상을 분석한다. 분석 결과, 한국의 KOSPI와 중국의 Shanghai 종합주가지수의 지수수익률 시계열 자료는 단위근이 존재하지 않으며, 변동성 집중 현상을 보이는 것으로 나타났다. 또한 한국보다는 중국 주식시장의 변동성 집중현상이 보다 강하게 나타나며, 이러한 현상은 일중 주가지수수익률 시계열 자료에서 보다 두드러지게 나타났다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2019.11a
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• pp.165-167
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• 2019

본 연구에서는 한국형 e-Navigation 선내시스템 원격 모니터링 서비스(SV20) 중 복원성 및 화재 판정 모듈의 개발과 운용개념에 대해서 소개하였다. 구체적으로는 선박의 복원성(안정성)과 관련된 메타센터 높이(GM), 복원성지수, 운동성지수 그리고 선체-파랑 동조위험성의 산출 및 표출에 대한 방안과 선내 화재정보의 표출 방안을 설명하고, 개발 진행사항 그리고 향후 연구 등을 기술하였다.

• The Korean Journal of Financial Studies
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• v.13 no.1
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• pp.77-92
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• 2007

한국증권시장을 포함한 대부분의 지역증권시장이 미국 뉴욕증권시장의 움직임에 반응하거나 동조현상을 보인다는 사실은 이미 경험적으로 혹은 통계적으로 널리 수용되고 있다. 본 연구는 그러한 반응에 비선형성이 존재하는가를 일별 주가수익률을 데이터로 활용하여 우선적으로 검정한다. 그러한 검정결과에 입각하여 비선형성을 내재화시킨 계량분석모형이 주가수익률을 설명하고 예측하는데 도움을 줄 수 있는가를 확인한다. 본 연구에서는 이러한 비선형성에 관련된 정보를 유도하기 위하여 평활전이(자기)회귀분석모형(STR)을 이용한다. STR모형은 국면전환을 야기하는 전이변수를 명시적으로 확인할 수 있고 다양한 국면전환형태를 모형에 수용할 수 있는 장점을 가지고 있다. KOSPI수익률의 비선형성에 대한 검정결과는 귀무가설인 선형성이 기각되는 것으로 나타났으며, 그러한 비선형성의 형태는 미국증권시장이 하강기에 처한 경우에 상승기에 처한 상태보다 민감한 동조현상을 보이는 것으로 나타났다. 하지만 추정된 STR모형이 주가의 변동을 설명하거나 예측하는데 여타의 모형보다 나은 능력을 가지는가에 대해서는 긍정적인 결과를 얻지 못하였다.

• The Korean Journal of Financial Management
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• v.20 no.2
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• pp.127-150
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• 2003

This study analyzes how capital market comovement can affect investors' decision making. We first analyze time-varying correlation coefficient between stock indices of U.S.A. and Korea. and then, using our empirical results, attempt to draw implications on investors' behavior. We find that the tendency of comovement between Korea and U.S.A. equity returns has considerably increased after the financial crisis of late 1997. Through the analysis of investors' behavior, we find that foreign investors, contrary to ITC's (Investment Trust Company) and individual investors, buy more shares in Korean markets as American stock prices go up. Foreign investors employ dynamic hedging strategy and give more weight on global economic factors than domestic ones. Our empirical results as a whole imply that investment behavior of foreign investors is most closely related to comovement of U.S.A. and Korea capital markets.

• Journal of Digital Convergence
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• v.14 no.7
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• pp.117-126
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• 2016

This study focuses the importance of relation between information attributes and communication of internet user. The author is to clarify how to communicate in internet environment and word-of-mouth as a result of social influence among internet user take place in relation to information attributes. The main findings are that comprehensive ease, relevance and novelty among information attributes positively influence reciprocal communication, reciprocal communication positively influences internalization and conformity, and those positively influence word-of-mouth communication.