• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.452-452
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• 2017

지속가능한 물관리는 필요한 용수(생활 공업 농업 유지)를 안정적으로 공급하기 위한 이수측면과 홍수피해를 최소화하기 위한 치수측면을 포함한 수량관리와 맑은 물 공급, 친수환경 조성, 생태계 보존을 위한 수질환경관리로 구분된다. 지속가능한 물관리를 실현하기 위해서 필수적으로 분석되어야 할 과학적 요소는 물순환과 관련된 각종 인자들의 변동성이며, 물순환은 크게 인간의 할동으로 인한 변화요소와 기후적인 변화요소에 의해 급진적으로 또는 점진적으로 변화된다. 본 연구에서는 청미천 유역을 대상으로 하여 홍수에 관한 잠재적 위협요인의 분석을 위한 RCP 4.5 및 8.5 시나리오 극한강우 사상의 통계적 특성 분석, 기후변화 시나리오에 대한 가뭄예측을 위한 수문순환 모형을 구축 및 수문학적 가뭄의 분석, 미래 수질을 모델링을 위한 기초자료 수집 및 매개변수 보정과 같은 연구를 수행하였다. 특히 본 연구에서는 극한강우사상을 이용하여 청미천 유역에서 발생될 수 있는 확률홍수량을 정상성 및 비정상성 빈도분석을 이용하여 파악하였으며, 이를 활용하여 기후변화 시나리오가 고려된 청미천 유역에서의 홍수량을 분석하여 그 결과를 비교 분석하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.1020-1023
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• 2008

멀티스레드 프로그램의 효과적인 디버깅을 위해서는 스레드의 비결정성에 의해 야기되는 다양한 수행 양상의 직관적인 이해가 중요하다. 스레드 수행 양상을 시각화하는 기존의 기법들은 공유 변수의 접근사건들 간의 부분 순서를 표현함으로써 시각적 복잡도가 높거나 이전 수행에서 결정된 락킹 순서를 표현하여 잠재되어 있는 다른 수행 양상에 대한 정보를 제공하지 못 한다. 본 논문은 프로그램 수행의 비결정적인 부분 순서는 락의 종류와 속성을 포함하는 코드 블록으로 시각화하고, 결정적인 부분 순서는 블록들을 연결하는 간선으로 시각화한다. 본 연구의 그래프는 플랫폼에 독립적인 Java Swing으로 구현하고 합성 프로그램을 사용하여 효과성을 실험한다.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.12 no.4
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• pp.61-72
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• 2017

Although small and medium-size enterprises are facing the significant trends in the Fourth Industrial Revolution and Open Innovation which are increasingly in need, the subjects of absorptive capacity and entrepreneurship has not been studied sufficiently in order to enhance the competitiveness of SMEs' products and cope with the current trend. The purpose of this study is to investigate the effects of absorptive capacity of SMEs on product competitiveness and the moderating role of CEO's entrepreneurship between the absorptive capacity and the product competitiveness. The data were collected from 313 employees of 22 SMEs in the Seoul metropolitan area, Kyunggi-do and Chung-cheong province, and analyzed using hierarchical regression analysis. As a result of the hypothesis test, both the absorptive capacity of SMEs and CEO's entrepreneurship had a positive effect on the product competitiveness. In addition, also found out the innovativeness and the proactivness out of the three entrepreneurship had the moderate roles between the potential absorptive capacity out of the absorptive capacity and the product competitiveness. On the other hand, the risk-taking out of the three entrepreneurship had the moderate roles between the realized absorptive capacity out of the two absorptive capacity and the product competitiveness. These results suggest that open innovation and technological entrepreneurship are needed to help SMEs learn external resources and information to create performance. After discussing this conclusions and implications of the study, the direction for future study was presented.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.7
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• pp.4489-4497
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• 2015

This study aims at estimating the consumer's demand and willingness to pay(WTP) for horse meat in Korea. Three econometric models are employed to examine the multiple layers of the demand, including the current demand, the potential demand and latent demand. Findings indicate a substantial demand for horse meat. Dichotomous choice contingent valuation method is used to elicit the WTP. We assess the mean WTP for horse meat using a double-bounded logistic model. As a result, consumers are willing to pay at 67.8 percent of the beef prices of the third quality grade to purchase horse meat. And, for the factors that influence on WTP, only sex, age and recognition of horse meat are statistically significant.

• The Korean Journal of Applied Statistics
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• v.27 no.3
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• pp.387-396
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• 2014

The GDP gap (also called the output gap) is the difference between potential GDP and actual GDP. Potential GDP is the maximum sustainable output that is achieved when the resources (labor and capital) are used to capacity. Central banks pursuing price and employment stability consider the output gap as an informative variable for monetary policy since the output gap could be regarded as a proxy of demand-supply imbalances. In this paper, the GDP gap of Korea is decomposed following the filtering method in the previous research, and major factors that affect the variation of GDP gap are investigated based on the decomposed series. The analysis results by the Super Smoother algorithm used in Fox et al. (2003)and Fox and Zurlinden (2006) are found consistent with theory. Much of the variation of nominal GDP gap is explained by Total Factor Productivity(TFP) gap, which is the change of productivity due to recent technological innovation and environmental change. It is also found that variation of terms of trade significantly affects the GDP gap of Korea due to its high dependency on international trade; however, the effect of the domestic price is not negligible like other countries.

• Journal of Digital Convergence
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• v.18 no.11
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• pp.31-41
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• 2020

This study analyzed parents' school satisfaction longitudinally using data from the 1st, 3rd, and 5th wave data of the Korea Education Longitudinal Study(KELS)2013. The subjects of analysis are parents who responded without dropping out in the first, third and fifth panel of the KELS2013, and 4,227 cases that had no missing values in the variables were selected for the sample to input for analysis of the latent growth modeling(LGM). As a result, it is confirmed that the parents' education, educational support, and children's academic achievement have a positive effect on the parents' school satisfaction. But the parents' educational view and education cost have a negative effect on that. The results of this study are expected to be important information to help enhance the primary function of the school.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.458-458
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• 2017

증발산은 지표면으로부터의 증발이나 식물에 의한 증산에 의해 유역으로부터 물이 제거되는 주요 기작으로서, 유역 물수지 관점에서 보았을 때 강수량과 증발산량의 차이로부터 유출이나 함양되는 양을 추정할 수 있다. 제주도의 경우에는 수자원 이용량의 약 84%를 지하수에 의존하고 있으며, 한편으로 제주도의 지질학적 특성으로 인해 일정 규모 이하의 강수량은 지표유출이나 중간유출의 과정없이 대부분 지하로 침투되기 때문에, 증발산량을 정확하게 파악하는 것이 지하수 함양량의 추정과 제주도 전체 수자원 계획에 큰 영향을 주게 된다. 정확한 증발산량 파악을 위해서는 지속적인 관측과 전문적인 계측장비 등에 의한 직접적인 방법이 있으나 광범위한 유역 단위의 관측값을 확보하는 것이 현실적으로 어렵기 때문에, 물수지법, 열수지법, 공기역학적방법 및 조합방법 등의 간접적인 방법이 많이 활용되고 있다. 간접적인 방법으로 많이 활용되고 있는 Penman-Monteith 법은 일 단위 기반의 정확도 높은 증발산량을 추정할 수 있는 장점이 있으나, 작물생육단계 및 토양수분, 기상 등 많은 변수들에 대한 입력을 요구하고 있기 때문에 복잡한 모델링 과정을 수반하게 되는 단점을 내포하고 있다. 반면, Morton (1978)의 CRAE (Complementary Relationship Areal Evapotranspiration)나 Priestly and Taylor (1973)의 AA (Advection-Aridity)와 같이 잠재증발산량과 실제증발산량간의 보완관계를 이용하는 방법은 지역적인 인자 또는 가용 수분에 대한 조건없이 몇 가지 기상자료만으로 유역의 증발산량을 산정할 수 있다는 장점이 있다. 본 연구에서는 제주도 지역의 4개 하천유역(한천, 천미천, 강정천, 외도천)을 대상으로, Penman-Monteith 법을 적용한 SWAT 모델링를 통해 얻어진 유역의 실제증발산량과 잠재증발산량으로부터, 고도에 따른 기상특성을 반영하여 증발산 보완관계를 검토하였다.

• KIPS Transactions on Software and Data Engineering
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• v.10 no.9
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• pp.367-374
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• 2021

Stock price prediction is a subject of research in various fields such as economy, statistics, computer engineering, etc. In recent years, researches on predicting the movement of stock prices by learning artificial intelligence models from various indicators such as basic indicators and technical indicators have become active. This study proposes a deep learning model that predicts the ups and downs of KOSPI from overseas indices such as S&P500, past KOSPI indices, and trading trends by KOSPI investors. The proposed model extracts a latent variable using a stacked auto-encoder to predict stock price fluctuations, and predicts the fluctuation of the closing price compared to the market price of the day by learning an LSTM suitable for learning time series data from the extracted latent variable to decide to buy or sell based on the value. As a result of comparing the returns and prediction accuracy of the proposed model and the comparative models, the proposed model showed better performance than the comparative models.

• Korean Journal of Child Care and Education Policy
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• v.12 no.3
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• pp.31-53
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• 2018

The aim of this study was to examine trajectories in and predictors of marital satisfaction among parents with one year old baby. Latent growth modeling was used with a sample of 984 households. Data from Panel Study on Korean Children conducted by Korea Institute of Child Care and Education were used. The study results revealed that for both fathers and mothers, marital satisfaction decreased over time after the birth of the first child. However, fathers' marital satisfaction decreased more steeply than mothers'. Furthermore, mothers' employment was associated with the changes of fathers' marital satisfaction. Father involvement and marital conflict predicted changes of mothers' marital satisfaction. These findings show that factors such as father involvement and marital conflict are more highly associated with changes in mothers' marital satisfaction than fathers'. Also, the study suggests that parent education should be systematically organized to promote father involvement and to resolve marital conflict.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.15 no.3
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• pp.175-189
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• 2020

While there have been many previous studies showing that an entrepreneur's personal characteristics have a significant impact on his intention to start a business, there was relatively little research on the inherent mechanisms for this. Recent researches show that entrepreneur's personal characteristics affect the entrepreneurial intention through entrepreneurial attitude and perceived behavioral control, rather than directly. This study carried out empirical research on 233 Chinese university students on what personal characteristics affect the entrepreneurial intention of Chinese university students, who are actively engaged in start-up activities recently. Based on the theory of planned behavior, we set entrepreneurial attitude and perceived behavioral control as important variables that shape the entrepreneurial intention and formed a model and hypotheses that personal characteristics of a potential entrepreneur(leadership, planning, innovation, sociality) affect the entrepreneurial intention through these two variables. We verified these hypotheses by regression analysis and structural equation model. The analysis confirmed that for Chinese university students the entrepreneurial attitude and perceived behavioral control were important antecedent variables that shape the entrepreneurial intention. It was also shown that leadership and innovation have a positive influence on the entrepreneurial attitude, while leadership and planning raise the level of perceived behavioral control. As a result, leadership forms the entrepreneurial intention through the entrepreneurial attitude and perceived behavior control, and innovation affects the entrepreneurial intention through the entrepreneurial attitude, while planning affects the entrepreneurial intention through perceived behavior control. Therefore, entrepreneurship education that emphasizes leadership, innovation and planning is required for Chinese college students as a potential entrepreneur. These three factors could also be important personal characteristics when choosing a potential entrepreneur.