• Title/Summary/Keyword: 추론통제

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Inference of natural flood frequency for the region affected by dams in Nam Han River (남한강 유역 댐 영향 지역의 기본홍수량 추론)

  • Kim, Nam Won;Lee, Jeong Eun;Lee, Jeongwoo
    • Journal of Korea Water Resources Association
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    • v.49 no.7
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    • pp.599-606
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    • 2016
  • The objective of this study is to estimate the unregulated flood frequency from Chungju dam to Yangpyung gauging station for the region affected by dams based on the peak discharges simulated by storage function routing model. From the flood frequency analyses, the quantiles for the unregulated flood frequency at 6 sites have similar pattern to each other, and their averaged quantile almost matched to the result from the regional flood frequency analysis. The quantile and annual mean discharge for the unregulated flood frequency for the downstream of Chungju dam show the similar behaviour to those for the upstream area. While the quantile and the annual mean discharge for the regulated flood frequency are significantly different from those for the unregulated flood frequency. In particular, the qunatile shows severe difference as the return period increases, and the annual mean discharge has a tendency to approach to the natural flood as the distance from dam increases.

Narrative Frames and Interpretive Communities: Frame Competition over the Resumption of W.O.C. Controversy and Journalistic Discourse of Interpretive Community (내러티브 프레임과 해석 공동체: '전작권 환수 논란'의 프레임 경쟁과 해석 집단의 저널리즘 담론)

  • Kim, Kyung-Mo;Chong, Eun-Ryung
    • Korean journal of communication and information
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    • v.57
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    • pp.109-136
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    • 2012
  • This research analyzed the news coverage of controversy over Korean resumption of Wartime Operational Control from the United States in 2006, trying to find various narrative frames and their relevance to the characters of journalistic interpretive communities. Three competitive frames emerged: Self-national defense and peace making, Balance of self-national defense and the Korea-US alliance, and Priority of the Korea-U.S. alliance and national security. Journalistic discourses were also analyzed through the in-depth interviews of 14 journalists from three interpretive communities. The results revealed that competitions of narrative frames reflected the tensed relationship among political power blocs, each representing the liberal, moderate, or conservative camp of Korean society, and preference of journalistic practices such as objective journalism to advocacy journalism. Finally, inferences were made that the clashes among interpretive authorities, existing behind the competition of news frames, restrained public deliberations on a critical incident regarding national security by blocking up the reasoned news coverage of political controversy.

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The Study of Facebook Marketing Application Method: Facebook 'Likes' Feature and Predicting Demographic Information (페이스북 마케팅 활용 방안에 대한 연구: 페이스북 '좋아요' 기능과 인구통계학적 정보 추출)

  • Yu, Seong Jong;Ahn, Seun;Lee, Zoonky
    • The Journal of Bigdata
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    • v.1 no.1
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    • pp.61-66
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    • 2016
  • With big data analysis, companies use the customized marketing strategy based on customer's information. However, because of the concerns about privacy issue and identity theft, people start erasing their personal information or changing the privacy settings on social network site. Facebook, the most used social networking site, has the feature called 'Likes' which can be used as a tool to predict user's demographic profiles, such as sex and age range. To make accurate analysis model for the study, 'Likes' data has been processed by using Gaussian RBF and nFactors for dimensionality reduction. With random Forest and 5-fold cross-validation, the result shows that sex has 75% and age has 97.85% accuracy rate. From this study, we expect to provide an useful guideline for companies and marketers who are suffering to collect customers' data.

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Effect of Social Participation Influencing Elderly's Suicidal Ideation (사회참여가 노인 자살생각에 미치는 영향 -사회적 지지와 자기효능감의 매개효과를 중심으로-)

  • Jeong, Il-Young
    • The Journal of the Korea Contents Association
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    • v.13 no.9
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    • pp.164-177
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    • 2013
  • This study's aim was to attest social support and self-efficacy's mediation effects in the path which social participation affected to elderly's suicidal ideation. Analysis data were Seoul Welfare Panel Data 2th wave(2010). A total of 1,429 cases aged over 65 were used for this study. Analysis method was AMOS 18.0's Structural Equation Modeling, and sobel test was used for attesting mediation effects's significance degree. Analysis results had established that measurement model and structural model's fit was favorable, and all path coefficients had significance degree. Therefore, this model was suitable for this study. Also this results had proved that this study's model was full mediation model, and it means that if mediation variables controlled, and then direct effect was excluded. And analysis results confirmed social support and self-efficacy' mediation effect had significance, by using a sobel test. Based on analysis results, this study suggested the importance of relationship between secondary group and individual, and presented intervention plans.

The Effect of Cloze Procedure with a Cartoon on Academic Interests and Reading Achievements (만화 텍스트 빈칸 메우기 전략을 활용한 읽기 학습이 흥미 및 학업성취에 미치는 영향)

  • Choe, In-Hui;Kim, Sung-il
    • (The) Korean Journal of Educational Psychology
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    • v.22 no.1
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    • pp.215-234
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    • 2008
  • This study investigates the effect of cloze procedure using either cartoons or texts on academic interests and reading achievements. Three equivalent classes were selected from an 1st grade in elementary school in terms of academic interests and reading achievements. While two experimental conditions used cloze procedure either with cartoons or texts during 15 lessons, the control condition used a traditional reading procedure. The results indicated that cloze procedure with cartoons enhanced academic interests in reading only for low achievement participants. Cloze procedure condition also outperformed the control condition on both immediate and delayed dictation test. In particular, cloze procedure with cartoons were quite effective for low achievement participants. Lastly, both types of cloze procedure facilitated overall comprehension test score, specifically inferential understanding test score but not factual understanding test score. Based on these findings, the types of text and learning strategy to improve academic interests and reading-related achievements were discussed.

Overview of estimating the average treatment effect using dimension reduction methods (차원축소 방법을 이용한 평균처리효과 추정에 대한 개요)

  • Mijeong Kim
    • The Korean Journal of Applied Statistics
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    • v.36 no.4
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    • pp.323-335
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    • 2023
  • In causal analysis of high dimensional data, it is important to reduce the dimension of covariates and transform them appropriately to control confounders that affect treatment and potential outcomes. The augmented inverse probability weighting (AIPW) method is mainly used for estimation of average treatment effect (ATE). AIPW estimator can be obtained by using estimated propensity score and outcome model. ATE estimator can be inconsistent or have large asymptotic variance when using estimated propensity score and outcome model obtained by parametric methods that includes all covariates, especially for high dimensional data. For this reason, an ATE estimation using an appropriate dimension reduction method and semiparametric model for high dimensional data is attracting attention. Semiparametric method or sparse sufficient dimensionality reduction method can be uesd for dimension reduction for the estimation of propensity score and outcome model. Recently, another method has been proposed that does not use propensity score and outcome regression. After reducing dimension of covariates, ATE estimation can be performed using matching. Among the studies on ATE estimation methods for high dimensional data, four recently proposed studies will be introduced, and how to interpret the estimated ATE will be discussed.

Inefficiencies and Productivity Change of Domestic Banks including Non-performing Loan with Normal Output after Financial Crisis (금융위기 이후 부실채권을 고려한 국내 은행의 비효율성과 생산성 변화)

  • Chang, Young-Jae;Yang, Dong-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.6
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    • pp.91-102
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    • 2020
  • This study constructed production frontiers of inputs and outputs in a sequential manner, measured inefficiencies by applying a non-radial sequential weighted Russell directional distance function to these frontiers, and analyzed Luenberg productivity indices and the contribution of each of input and output factor based on these distances. The results are as follows. First, the productivity of banks increased due to technical changes after the global financial crisis. Second, productivity growth decreased between 2009 and 2014 due to technical changes after the recession, as previous studies have shown that technology progressed before the global financial crisis but then largely decreased or remained the same thereafter. After 2014, the productivity of banks improved. This result may be due to both technology improvement after 10 years of stagnation and reduction of inputs and non-performing loans. Third, the 3.6% annual of productivity growth for 10 years was comprised of 1.77% household loans, 0.67% corporate loans, 0.98% manpower, 1.18% non-performing loans, -0.5% total deposits, and -1.25% securities. Finally, this study has limitations since it could not control risks such as capital structure and interest volatility.

The Relationship between Ownership(and Outside Directors) and Firm Value in KOSDAQ (코스닥 상장법인의 소유구조 및 사외이사와 기업가치 간의 관련성 분석)

  • Park, Bum-Jin
    • The Korean Journal of Financial Management
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    • v.24 no.4
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    • pp.45-73
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    • 2007
  • The empirical results are summarized as follows : First, In relation to effects of ownership structure on firm value, there is the non-linear relationship between major(and foreign) shareholder's holdings and firm value. So the results(the compromise hypothesis) by prior researches(Morck et al. 1988 and so forth) is supported. However Institutional shareholder's holdings do not show the significant results. Second, In relation to effects of outside directors on firm value, equally the results of prior researches(Vafeas 2000, Choi et al. 2004), the higher the ratio of outside directors in the board, the higher firm value. Also there is the non-linear relationship between outside directors ratio and firm value. Furthermore, the higher the possibility of outside directors election in the board, the higher the relationship between ownership structure and firm value. As the economic importance of KOSDAQ is more increase, the researches of KOSDAQ should be more realized.

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Pecking Order Theory and Korean Family Firms: Effect of Ownership and Governance Characteristics (한국기업의 가족경영과 자본조달우선순위: 소유·지배구조 특성의 영향분석)

  • Jung, Mingue;Kim, Dongwook;Kim, Byounggon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.3
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    • pp.518-526
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    • 2017
  • This study analyzed the impact of family firms and their characteristics on how they use debts to analyze the decision-making process of Korean family firms. For analysis, we classified the characteristics of family firms into three categories, through the influence of the relationship between the lack of funds and net debt issuance, which was confirmed as the 'packing order theory' of family firms. There was a total of 4,503 enterprises in the Korean Exchange (KRX). The period of analysis was 10 years, between 2004 and 2014. To summarize, Shyam-Sunder and Myers (1999) validated the packing order theory by presenting a model of family businesses that showed greater applicable to higher packing order theory than a model of non-family businesses. Moreover, the results also confirmed the application of the packing order theory by the family stronger corporate governance and ownership structure. The ownership and governance characteristics of the ruling family has also shown the applicability of higher packing order theory.

A Study on the Enhancing of the Global Competitiveness of the Services of Tax, Law, and Accounting - Focusing on Multi-Disciplinary Practices(MDP) - (조세·법률·회계 서비스의 국제경쟁력 제고 방안 - 이종자격사간 동업(MDP)을 중심으로 -)

  • Son, Yun;Lee, Hak-loh
    • International Commerce and Information Review
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    • v.19 no.4
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    • pp.53-74
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    • 2017
  • There have been growing concerns that Korea's products keep losing their international competitiveness. It is necessary to restore strong muscles of manufacturing sectors. Together, efforts must be made to strengthen the competitiveness of service sector. While wide consensus has been reached on the necessity that Korea's service sector needs overhaul for stronger global competitiveness, it is rather difficult to witness any remarkable improvements. Insufficient performances might result from the protection of the captive markets by the interested parties. The research starts from the proposition that the introduction of MDP will bring down the barriers between the segmented services and promote competition. We provide theoretical analyses and report better performances of major countries which introduced MDP in their soils. Considering the reality, we propose that in the foreseeable future, a MDP in the areas of tax, law and accounting be introduced in Korea because these areas seem to create least conflicts of disciplinary duties due to public purposes. Broader MDPs in other areas may take some more time. There exist, however, some limitations. As MDP has not been officially introduced in Korea, it is almost impossible to directly compare the performances between the pre- and post-MDP in Korea. Data scarcity of business performances of companies also limits the study.

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