• The Korean Journal of Financial Management
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• v.20 no.1
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• pp.163-190
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• 2003

This study tests the hypothesis of market efficiency through the information spillover effects over price and volatility across countries by using open-to-close(daytime) returns and close-to-open(overnight) returns of NASDAQ, KOSDAQ and JASDAQ data from January 3, 1997 to December 21, 2000. Based on Granger-causality and time-varying AR(1)-GARCH(1, 1)-M models we document that the evidence of statistically significant conditional mean and volatility spillovers effects from the daytime returns and volatility of NASDAQ to the overnight returns and volatility of KOSDAQ is observed both before and after the IMF foreign currency crisis but not to the close-to-open return before the IMF foreign currency crisis. We can understand the information spillover effect from NASDAQ to KOSDAQ on the overnight rather than the daytime grows more significantly after the IMF foreign currency crisis. We also find the interactive information spillover effect between NASDAQ and JASDAQ both before and after the IMF financial crisis, in particular, to close-to-open return. In addition, the market efficiency between KOSDAQ and NASDAQ is on an increasing trend through IMF foreign currency crisis.

• Korean Business Review
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• v.16
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• pp.43-60
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• 2003

There are several stylized facts concerning stock return volatility. First, it is persistent, so an increase in current volatility lasts for many periods. Second, stock volatility increases after stock prices fall. Third, stock volatility is related to macroeconomic volatility, recessions, and banking crises. On the other hand, there are many competing parametric models to represent conditional heteroskedasticity of stock returns. For this article, I adopt the strategy followed by French, Schwert, and Stambaugh(1987) and Schwert(l989, 1990). The models in this article provide a more structured analysis of the time-series properties of stock market volatility. Briefly, these models remove autoregressive and seasonal effects from daily returns to estimate unexpected returns. Then the absolute values of the unexpected returns are used in an autoregressive model to predict stock volatility.

• The Journal of the Korea Contents Association
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• v.22 no.9
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• pp.271-282
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• 2022

The paper analyzes the effects of the emergence of Fintech on the banking and savings banking industries in Korea. From the analysis, we find that net interest margin decreases and credit supply increases with the advent of Fintech in the banking industry. Similarly, in the savings banking industry, a profitability index decreases. This is interpreted as the result of reduced monopoly power and increased efficiency in the industries, inducing an increase in overall consumer benefits. Individual financial institutions may, however, experience difficulties such as reduced profitability and increased Fintech investment costs.

• Korean Journal of Construction Engineering and Management
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• v.10 no.3
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• pp.62-71
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• 2009

The purpose of this study is to analyze of profitability accordance to the different sales timing in apartment housing development projects. The adapted research method about public apartment hosing development projects by a private construction company is concentrated on the middle and large scale housing. The methodology for analysis of profitability through the change of timing for sales is analysed. According to this methodology, the difference of profitability by different timing of first sales is compared and analyzed. The results of this study are as followed 1)The major factors to affect the profitability for apartment housing development project consist of the timing of sales, the method of payment and the rate of sales. 2) The case study was carried out and then the profitability is analyzed the profitability for the three of cases is got worse when the sale after construction especially on the time of construction progress rate 80% is carried out.

• Journal of the Korea Convergence Society
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• v.10 no.9
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• pp.199-207
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• 2019

This study aims to analyze the profitability of Robo-Advisors portfolio combined with the analysts' forecasts on the Korean stock prices. Sample stocks are 8 blue-chips and sample period is from 2003 to 2019. Robo-Advisor portfolio was suggested using the Black-Litterman model combined with the analysts' forecasts and its profitability was analyzed. Empirical result showed the suggested Robo-Advisor algorithm produced 1% annual excess return more than that of the benchmark. The study documented that the analysts' forecasts had an economic value when applied in the Robo-Advisor portfolio despite the prevalent blames from investors. The profitability on small or medium-sized stocks will need to be analyzed in the Robo-Advisor context because their information is relatively less known to investors and as such is expected to be strongly influenced by the analysts' forecasts.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.965-966
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• 2009

본 논문은 시스템 트레이딩을 사용하여 피라미드 전략이 상승장에서 어떠한 수익률을 보이는가를 분석한다. 옵션 시장에서 매도는 프리미엄의 감소라는 이점과 무제한 손실이라는 단점을 가지고 있다. 옵션의 매도는 증거금 제도로 인하여 개인의 매매 기법으로는 제한되어 있으나 효과적인 전략을 사용하면 수익성을 높이는데 매우 중요한 매매 기법이다. 다중 매도 진입으로 풀이되는 피라미드 전략을 제시하고 최근 상승장에서의 성능을 분석한다.

• The Korean Journal of Financial Management
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• v.23 no.2
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• pp.1-25
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• 2006

This paper studied the performance of momentum strategy and contrarian strategy based or past stock return ratio of Korean stock market. The comparative study shows that the volatility of stock markets that can be found the performance of momentum strategy is smaller than that of emerging stock market. Accordingly, This paper examines that the performances of momentum strategy and contrarian strategy are affected by the larger volatility in Korean stock market. Further analysis using the 6 years sub-portfolios reveals that the momentum strategy is significant only during 1980 to 1986 time period when it had the least market volatility. Additionally, we investigate whether firm-level volatility as well as market volatility influence on the performance of contrarian strategy, and figure out that the momentum strategy is significant for the portfolio composed of firms with smaller volatility for previous period, while not significant for the portfolio composed of firms with larger volatility.

• Korean Journal of Construction Engineering and Management
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• v.8 no.2
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• pp.127-135
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• 2007

Markets for the apartment remodeling projects will be a major portion of the construction industry in near future. However, only partial remodeling works in the apartment were done so far. This situation caused bad impact to expand the remodeling markets and less profits of the remodeling projects. In order to solve this problem, many other researches were done previously to Improve profits of the apartment remodeling projects. However, the results are too theoretical to implement them and Improve profits. In this research, profitability influence factors that are possible to improve effect of the remodeling works are selected and analyzed through several studies. Then, correlation analysis is performed between the improvement level in the remodeling projects and the numerical profitability based on actual cases. The result clearly shows that some improved remodeling items are strongly related to the profit. These results lead us to the strategy to follow for the purpose of increasing profits of the remodeling projects.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2000.05a
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• pp.425-463
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• 2000

본 연구에서는 3단계에 걸쳐 투자하고 있는 초고속 국가망사업에 대해서 과연 사회적으로 경제성을 갖고 있는지 여부를 분석해 보았다. 이를 위하여 첫째, 산업연관모형을 이용하여 초고속 국가망 사업에 투입한 투자액이 유발시킨 부가가치 창출효과와 고용창출효과를 계산하였다. 다음으로 초고속 국가망 사업으로부터 파생되는 초고속 국가망의 기본서비스 수요를 예측하는 방법론을 제시하였다. 셋째, 초고속 국가망으로부터 파생되는 기본서비스 수요 창출로 인하여 향후 2010년까지 얼마만큼의 새로운 부가가치가 창출되고, 새로운 고용이 얼마만큼 창출되는지 여부를 산업연관모형을 통하여 분석하였다. 마지막으로 초고속 국가망 사업에 투자한 총금액에 대비하여 이를 통하여 얻어지는 부가가치창출효과, 고용창출효과 및 수요창출효과 등을 감안하여 과연 초고속 국가망 사업이 얼마만큼 사회적으로 경제성을 지니고 있는지를 계산해 보고자 하였다. 초고속 국가망 사업을 통한 직접적인 유발효과와 부가적인 효과를 모두를 고려하였을 때 예상되는 순수익의 투자수익율은 5439.2%로서 투자액의 54배의 사회적 수익성을 창출한다고 본다. 다음으로 부가가치유발액, 매출이익에 새로운 고용유발로 인한 소득증가분을 감안하여 사회적 수익을 계산하고, 이에 근거하여 경제성 분석을 하면 21,493.3.%와 같이 215배의 사회적 수익성이 창출된다고 계산되어진다. 따라서 간단하게 이익률법에 근거한 초고속국가망 사업에 대한 사회적 편익과 비용에 근거한 경제성 분석을 하면 초고속 국가망 사업은 투자액의 무려 215배의 사회적 편익을 제공하는 것으로 나타났다.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2007.11a
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• pp.54-59
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• 2007

Recently, Apartment Reconstruction Projects are performing only with the basis of profitability without establishing either certain criteria or standard guideline. In addition, the profitability information contained in a disposal plan tends to be considered as a fixed value, and it is frequently changeable because reconstruction projects have such a long time to complete and many participants with respective interests. As mentioned above, the new approach needs to be developed which covers the limitation of the unvaried one. Consequently, this study focuses on the probability approach considering not only variances that affect the profit, but the relationship between profit and risk, and then is modeling. This study is anticipated to improve the reliability and accuracy of expected value as well as apply to the decision making criteria quantitively about potentially hidden risks in that projects.