• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2005.05a
• /
• pp.10-17
• /
• 2005

최근 들어 모바일뱅킹 서비스는 사용자들이 급속히 증가하고, 금융기관과 이동통신 업체의 적극적인 투자가 빠르게 확대되고 있어서 시장의 발전 가능성이 높이 기대되고 있다. 그러나 아직까지 모바일뱅킹 서비스는 고객의 서비스 만족도나 서비스 제공자의 수익 면에서 만족할 만한 수준을 나타내고 있지는 못하다. 따라서 본 연구는 사용자들이 모바일뱅킹을 사용하는데 결정적인 영향을 미치는 요인을 제시하여 전략적 경쟁 도구로서의 모바일뱅킹 확산을 지원하고자 한다. 이를 위해 문헌고찰을 통해 모바일뱅킹 서비스의 특징 및 현황을 파악하고 유용성, 사용성, 서비스품질, 사회적 영향, 즉시 접속성 등의 요인을 도출하여 모바일뱅킹 기술수용모형을 제시하고 검증하였다 분석결과 모바일뱅킹 사용에 영향을 미치는 요인은 모바일뱅킹의 유용성, 서비스 품질 그리고 즉시 접속성이 유의한 것으로 나타났으며, 반면 사용성과 사회적 영향은 유의하지 않은 것으로 나타났다. 이러한 연구 결과는 많은 시사점을 제공하며, 앞으로 좀 더 추가적인 연구와 토의가 이루어져야 할 것이다.

• Electronics and Telecommunications Trends
• /
• v.31 no.5
• /
• pp.120-130
• /
• 2016

21세기 디지털 사회에서는 각 개인의 연결과 상호작용이 사회 현상에 막대한 영향을 미치고 있으며, 이로 인해 사회는 더욱 복잡해지고, 순간적으로 급격한 변화가 일어나는 현상이 빈번히 발생한다. 사회 복잡성(Social Complexity)은 다수의 사회 구성원들 간의 복잡한 연결로 인해 발생하는 상호작용 패턴을 의미한다. 2011년 발생한 '아랍의 봄' 혁명, 글로벌 금융위기, 조류독감의 발생과 확산, 글로벌 기후 변화, 테러리스트들의 네트워크와 사이버 범죄의 증가 등은 복잡하게 연결된 글로벌 사회 현상으로 발생하는 복잡성의 사례들이다. 우리 사회의 안전성과 지속성을 확보하기 위해, 이러한 사회 복잡성을 그려내어, 그 속에 숨겨진 패턴을 분석하고 예측하는 기술에 대한 연구 개발이 국가적으로 필요하다. 다양한 분야의 사회적 모형을 개발하고 서로 연결하여, 복잡한 사회적 상호작용을 대규모 시뮬레이션을 통해 현상 분석과 사회경제 정책적 대응방향에 대한 통찰력을 가질 수 있는 대규모 '모사현실(Simulated Reality)' 기술 개발을 서둘러야 한다.

• KDI Journal of Economic Policy
• /
• v.33 no.2
• /
• pp.81-110
• /
• 2011

Credit rating agencies(CRAs) are accused of failing to provide accurate and fair credit ratings and hence being responsible for the crisis. This paper tries to add on to the literature on credit rating reform through examining the CRAs in a model where rating quality is unobservable. We show that unobservability of rating effort results in the sub-optimal level of quality. Then the paper extends the model to incorporate ancillary services, competition and reputation. We show that ancillary services worsen the conflict of interests of the CRAs and that competition and reputation may not be strong enough to discipline the CRAs. Hence regulatory oversight and imposition of liability may be necessary in order to increase the accuracy of ratings.

• The Korean Journal of Applied Statistics
• /
• v.36 no.4
• /
• pp.309-322
• /
• 2023

The Hawkes process is a point process with self-exciting characteristics. It has been mainly used to describe seismic phenomena in which aftershocks occur due to the main earthquake. Recently, it has been used to explain various phenomena with self-exciting properties, such as the spread of infectious diseases and the spread of news on SNS. The Hawkes process can be flexibly modified according to the characteristics of events by using various types of excitation functions. Since it is difficult to implement a maximum likelihood estimator numerically, estimation methods have been improved until recently. In this paper, the conditional intensity function and excitation function are explained to describe the Hawkes process. Then, existing examples of Hawkes processes used in seismic, epidemiological, criminal, and financial fields are described and estimation methods are introduced. I analyze earthquakes that occurred in gyeongsang-do, Korea from November 2017 to December 2022, using R package ETAS.

• The Korean Journal of Applied Statistics
• /
• v.29 no.4
• /
• pp.559-569
• /
• 2016

A long-run relationship of stock, monetary, realty markets, and business conditions has been suggested to exist due to internal and external shocks. This study investigates whether such a relationship really exists and then performs statistical tests to discern features of the long-run adjustment processes from short-run discrepancies because it is difficult to find studies that examine the market relationship. The comovement relationship of the whole market does not appear to hold for the entire study period; however, it is found to exist for the period before the financial crisis. Estimated error correction models show consistently declining equilibrium errors each period that suggests a recovering process of the long-run equilibrium from short-run secessions.

• Information Systems Review
• /
• v.6 no.1
• /
• pp.19-36
• /
• 2004

The importance of Internet banking has been emphasized due to the spread of Internet and the potential advantages of Internet banking. In case of Korea, Internet banking users have been risen dramatically since 1999 after its introduction. The purpose of this study is to draw the antecedent variables that affect the adoption of Internet banking and show their effects empirically. In this paper, influencing factors are proposed to distinguishing Internet banking users from non-users. And nine hypotheses are empirically tested using logistic regression. The results show that most of hypotheses are supported except for complexity and IT innovativeness. And compatibility was found to have a strong positive effect on the adoption of Internet banking. Implications of these findings are discussed for researchers and practitioners.

• Journal of Korea Technology Innovation Society
• /
• v.17 no.4
• /
• pp.786-819
• /
• 2014

Emphasizing the importance of R&D as a source of open innovation, Korean government is developing various programs focused on technology commercialization and is expanding investment on it. In spite of those efforts, technology commercialization is not vitalized yet due to the lack of demand for technology transfer, R&D planning scheme without considering market, immaturity of technology market, and so on. This study aims to suggest the business ecosystem model so that technology commercialization could be facilitated based on business ecosystem perspective. We set the framework for modeling a business ecosystem through reviewing the previous works, and draw several problems to be solved regarding public R&D commercialization in Korea from the perspective of ecosystem. Considering those, this research proposes the business ecosystem model for public R&D commercialization as a reference model for describing, discussing, and developing the technology commercialization strategy. The proposed model consists of 4 domains as follows: R&D, technology market, information distribution channels, and customers. The business ecosystem model shows that technology commercialization could be facilitated to create the market value through close relationship and organic cooperation among its members that form the ecosystem. Public research institutes as a keystone player could control the fate of the ecosystem. In this regard, this paper suggests roles of public research institutes for evolving the business ecosystem.

• Management & Information Systems Review
• /
• v.37 no.2
• /
• pp.259-281
• /
• 2018

Advocates of mandatory IFRS adoption claim that IFRS increase financial statement comparability, which in turn leads to greater cross-border investment(Securities and Exchange Commision, 2008). The notion is that improved financial statement comparability reduces the information acquisition costs of global investors and thereby increase their investment in foreign firms. The purpose of this study is to examine this assertion by examining whether the K-IFRS adoption rusults in improved comparability that leads to increased investment by foreign investment. We also examined whether the relation between comparability and foreign investment has strengthen after adoption of K-IFRS. To achieve the purpose of our study, we measure Korean firms comparability using stock price model, stock return model and cash flow from operation model by Barth et al.(2012). We use both foreign ownership in the end of year and average during the year for dependent variables were to reduce bias. We test our hypothesis using 1,817 firm-year observation of KOSPI firms during the period of our analysis, 2011-2015. Consistent with our hypothesis, we find K-IFRS adoption results in a greater increase in foreign investment in firms with high comparability firms. This result indicate that the adoption of K-IFRS intends to achieve the international accounting convergence as stated in the roadmap and to reduce the Korea Discount.

• The Korean Journal of Applied Statistics
• /
• v.34 no.1
• /
• pp.115-126
• /
• 2021

Central banks communicate with the market through a statement on the direction of monetary policy while implementing monetary policy. The rapid contraction of the global economy due to the recent Covid-19 pandemic could be compared to the crisis situation during the 2008 global financial crisis. In this paper, we analyzed the text data from the monetary policy statements of the Bank of Korea and Fed reflecting monetary policy directions focusing on how they were affected in the face of a global crisis. For analysis, we collected the text data of the two countries' monetary policy direction reports published from October 1999 to September 2020. We examined the semantic features using word cloud and word embedding, and analyzed the trend of the similarity between two countries' documents through a piecewise regression tree model. The visualization result shows that both the Bank of Korea and the US Fed have published the statements with refined words of clear meaning for transparent and effective communication with the market. The analysis of the dissimilarity trend of documents in both countries also shows that there exists a sense of synchronization between them as the rapid changes in the global economic environment affect monetary policy.

• The Korean Journal of Financial Management
• /
• v.27 no.2
• /
• pp.169-204
• /
• 2010

This paper examines the dynamic relationship between fund flow and market risk at the aggregate level and explores whether sudden sharp changes in fund flow (fund run) can cause a systemic risk in the Korean financial markets. We use daily and weekly data and regression and VAR analysis. Main results of the paper are as follows: First, in the stock market, a concurrent and a lagged unexpected fund flows have a positive relationship with market volatility. A positive shock in fund flow predicts an increase in stock market volatility. In the bond market, an unexpected fund flow has a negative relationship with the default risk premium, but a positive relationship with the term premium. And an unexpected fund flow of the money market fund has a negative relationship with the liquidy risk, but the explanatory power is very low. Second, for examining whether changes in fund flow induce a systemic risk, we construct a spillover index based on the forecast error variance decomposition of VAR model. A spillover index represents that how much the shock in fund flow can explain the change of market risk in a market. In general, explanatory powers from spillover indexes are so fluctuant and low. In the stock market, the impact of shocks in fund flow on market risk is relatively high and persistent during the period from the end of 2007 to 2008, which is the subprime-mortgage crisis period. In bond market, since the end of 2008, the impact of shocks in fund flow spreads to default risk continually, while in the money market, such a systematic effect doesn't take place. The persistent patterns of spillover effect appearing around a certain period in the stock market and the bond market suggest that the shock to the unexpected fund flow may increase the market risk and can be a cause of systemic risk in the financial markets. However, summarizing the results of regression and VAR model analysis, and considering the very low explanatory power of spillover index analysis, we can conclude that changes in fund flow have a very limited power in explaining changes in market risk and it is not very likely to induce the systemic risk by a fund run in the Korean financial markets.