• Title/Summary/Keyword: 패널 선정

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Development and application of prediction model of hyperlipidemia using SVM and meta-learning algorithm (SVM과 meta-learning algorithm을 이용한 고지혈증 유병 예측모형 개발과 활용)

  • Lee, Seulki;Shin, Taeksoo
    • Journal of Intelligence and Information Systems
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    • v.24 no.2
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    • pp.111-124
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    • 2018
  • This study aims to develop a classification model for predicting the occurrence of hyperlipidemia, one of the chronic diseases. Prior studies applying data mining techniques for predicting disease can be classified into a model design study for predicting cardiovascular disease and a study comparing disease prediction research results. In the case of foreign literatures, studies predicting cardiovascular disease were predominant in predicting disease using data mining techniques. Although domestic studies were not much different from those of foreign countries, studies focusing on hypertension and diabetes were mainly conducted. Since hypertension and diabetes as well as chronic diseases, hyperlipidemia, are also of high importance, this study selected hyperlipidemia as the disease to be analyzed. We also developed a model for predicting hyperlipidemia using SVM and meta learning algorithms, which are already known to have excellent predictive power. In order to achieve the purpose of this study, we used data set from Korea Health Panel 2012. The Korean Health Panel produces basic data on the level of health expenditure, health level and health behavior, and has conducted an annual survey since 2008. In this study, 1,088 patients with hyperlipidemia were randomly selected from the hospitalized, outpatient, emergency, and chronic disease data of the Korean Health Panel in 2012, and 1,088 nonpatients were also randomly extracted. A total of 2,176 people were selected for the study. Three methods were used to select input variables for predicting hyperlipidemia. First, stepwise method was performed using logistic regression. Among the 17 variables, the categorical variables(except for length of smoking) are expressed as dummy variables, which are assumed to be separate variables on the basis of the reference group, and these variables were analyzed. Six variables (age, BMI, education level, marital status, smoking status, gender) excluding income level and smoking period were selected based on significance level 0.1. Second, C4.5 as a decision tree algorithm is used. The significant input variables were age, smoking status, and education level. Finally, C4.5 as a decision tree algorithm is used. In SVM, the input variables selected by genetic algorithms consisted of 6 variables such as age, marital status, education level, economic activity, smoking period, and physical activity status, and the input variables selected by genetic algorithms in artificial neural network consist of 3 variables such as age, marital status, and education level. Based on the selected parameters, we compared SVM, meta learning algorithm and other prediction models for hyperlipidemia patients, and compared the classification performances using TP rate and precision. The main results of the analysis are as follows. First, the accuracy of the SVM was 88.4% and the accuracy of the artificial neural network was 86.7%. Second, the accuracy of classification models using the selected input variables through stepwise method was slightly higher than that of classification models using the whole variables. Third, the precision of artificial neural network was higher than that of SVM when only three variables as input variables were selected by decision trees. As a result of classification models based on the input variables selected through the genetic algorithm, classification accuracy of SVM was 88.5% and that of artificial neural network was 87.9%. Finally, this study indicated that stacking as the meta learning algorithm proposed in this study, has the best performance when it uses the predicted outputs of SVM and MLP as input variables of SVM, which is a meta classifier. The purpose of this study was to predict hyperlipidemia, one of the representative chronic diseases. To do this, we used SVM and meta-learning algorithms, which is known to have high accuracy. As a result, the accuracy of classification of hyperlipidemia in the stacking as a meta learner was higher than other meta-learning algorithms. However, the predictive performance of the meta-learning algorithm proposed in this study is the same as that of SVM with the best performance (88.6%) among the single models. The limitations of this study are as follows. First, various variable selection methods were tried, but most variables used in the study were categorical dummy variables. In the case with a large number of categorical variables, the results may be different if continuous variables are used because the model can be better suited to categorical variables such as decision trees than general models such as neural networks. Despite these limitations, this study has significance in predicting hyperlipidemia with hybrid models such as met learning algorithms which have not been studied previously. It can be said that the result of improving the model accuracy by applying various variable selection techniques is meaningful. In addition, it is expected that our proposed model will be effective for the prevention and management of hyperlipidemia.

Publication Trends in Smoking-Related Research for Children and Adolescents: An Analysis of Korean Academic Journals (아동과 청소년의 흡연 관련 연구 동향 분석: 학술지 게재 논문을 중심으로)

  • Son, Hyun-Dong
    • Journal of the Korea Convergence Society
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    • v.10 no.2
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    • pp.269-276
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    • 2019
  • The purpose of this study was to investigate the publication trends of children and adolescents' smoking-related researches published in Korean academic journals. Three hundred fifty papers published until 2018 were analyzed by focusing on the publication year, research participants, research themes and research methods. As a result, smoking-related research on children and adolescents increased sharply from 1995 to 2000, and the trend continued. The main research participants were general children and adolescents and the most frequently studied themes were 'Associated Factors,' 'Intervention,' 'Prevalence,' 'Prevention,' 'Characteristics,' 'Law and Policies,' 'Scales,' 'Review and Theories' respectively. The most frequently used research method was the quantitative method. Moreover, the most common data gathering method was using questionnaires, and the number of papers which used panel data was gradually increasing. Future studies were suggested to explore a broader range of themes, and a balanced research approach was also recommended using both qualitative and mixed methods.

Delphi Analysis for Experts to Develop an Assessment Index for Women's Entrepreneurship Support Programs (여성창업 지원사업 평가지표 개발을 위한 전문가 대상 델파이 분석)

  • Kim Heung-Hee;Kim Yun-Hwan;Kim Moon-Sook;Ju Young-Mi;Kim Dae-Geun
    • The Journal of the Convergence on Culture Technology
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    • v.10 no.1
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    • pp.337-344
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    • 2024
  • This paper is a study on the "Development of Assessment Index for Women's Entrepreneurship support programs." This research highlights the absence of specific assessment indicators for selecting women-led enterprises in women's entrepreneurship support programs, thereby illuminating the limitations of current evaluation methods. It emphasizes the necessity for effective indicators to more successfully select women entrepreneurs and enterprises. The study derives numerous success factors for women's entrepreneurial ventures from prior research and develops a more likely to succeed assessment index for women-led enterprises using the Delphi methodology and collaboration with expert panels. The result is a new assessment index reflecting the characteristics of women entrepreneurs, expected to overcome the limitations of existing selection methods and contribute to enhancing social support and policy development for women-led enterprises.

A Preliminary Study on Family Function Components Affecting Individual Health and Disease: A Delphi Study (개인의 건강과 질병에 영향을 미치는 가족기능 구성요소에 관한 사전연구: 델파이 연구)

  • Kim, Ah-Ram;Jeong, Seong-Woo;Jeong, Jiin;Kim, Jung-Ran
    • Therapeutic Science for Rehabilitation
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    • v.10 no.3
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    • pp.83-96
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    • 2021
  • Objective : This study aimed to determine Korea-type family function factors that affect individual growth and social activities, and examine check the appropriate contents and domestic culture components based on the McMaster model, a family function evaluation tool, through the Delphi technique. Methods : The Delphi technique was applied to 12 expert panels in fields related to family function. The period lasted 9 weeks, from May to June 2020. The Delphi survey was conducted twice. In the first survey, the domestic culture and appropriate contents of the McMaster model were selected and localized, and expert' opinions about the components were collected using closed and open-ended questions. In the second survey, the fitness and importance of the components were investigated. Results : As a result of the first Delphi investigation, 18 items were deleted from the 53 items presented. After adding 11 items and excluding any overlapping items, a total of 40 items were selected. Subsequently, sentences that were difficult to understand were revised to familiar vocabulary. A second survey was constructed, with an example sentence. In the second Delphi investigation, 33 items were selected. The average content validity ratio for the final selected component was 0.76, and the stability was 0.28. Conclusion : Family function and the factors influencing domestic family function identified though this study can be used to conduct family function evaluations and interventions in clinical sites or relevant research studies.

A Study to select the optimum size for the panel of the precast slab track system (프리캐스트 슬래브궤도 패널의 최적규격 선정을 위한 연구)

  • Kim, Yoo-Bong;Moon, Do-Young;Beak, In-Hyuk
    • Proceedings of the KSR Conference
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    • 2011.05a
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    • pp.740-744
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    • 2011
  • Precast slab track system(PSTS) is a concrete track laying system where the slab panels are pre-manufactured in factories and assembled and installed on-site. PSTS has been developed for the past 30 years in countries where railway technologies are advanced such as Japan and Germany to improve the various drawbacks of the in-situ concrete slab track. However, the usefulness of PSTS is being continuously approved by many other countries such as China, Taiwan, Austria, Italy, Spain, etc,. Lately, not only Japan and Germany, but also Austria, Italy and China have developed their own PSTS by collaboration between their Governments and private enterprises and are now attempting to expand their businesse soverseas. In accordance to such movement, in 2006, the Korean Railroad Research Institution and Sampyo E&C have developed a Korean PSTS by joint research. PSTS consists of concrete panel, under pouring layer and concrete base layer. Amongst these components, the panel is the main component of PSTS which supports the train load and has a great effect on the track quality, workability and economics. Therefore, a study is to be conducted to select the optimum size for the Panel of the precast slab track system panel by analyzing the various standards & forms, interpretation of finite elements of the selected model and economical analysis.

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Solar radiation forecasting by time series models (시계열 모형을 활용한 일사량 예측 연구)

  • Suh, Yu Min;Son, Heung-goo;Kim, Sahm
    • The Korean Journal of Applied Statistics
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    • v.31 no.6
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    • pp.785-799
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    • 2018
  • With the development of renewable energy sector, the importance of solar energy is continuously increasing. Solar radiation forecasting is essential to accurately solar power generation forecasting. In this paper, we used time series models (ARIMA, ARIMAX, seasonal ARIMA, seasonal ARIMAX, ARIMA GARCH, ARIMAX-GARCH, seasonal ARIMA-GARCH, seasonal ARIMAX-GARCH). We compared the performance of the models using mean absolute error and root mean square error. According to the performance of the models without exogenous variables, the Seasonal ARIMA-GARCH model showed better performance model considering the problem of heteroscedasticity. However, when the exogenous variables were considered, the ARIMAX model showed the best forecasting accuracy.

A Study on the Determinant of Capital Structure of Chinese Shipbuilding Industry (중국 조선기업 자본구조 결정요인에 관한 연구)

  • Jin, Siwen;Lee, Ki-Hwan;Kim, Myoung-Hee
    • Journal of Korea Port Economic Association
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    • v.38 no.2
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    • pp.81-93
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    • 2022
  • Since 2008, China's shipping industry has been in a slump, with shipbuilding orders falling sharply, and high-growth excess capacity has become increasingly apparent, leaving many firms with sharply reduced orders at risk of bankruptcy and shutdown. To ensure the development of the shipbuilding industry and enhance the international competitiveness of the shipbuilding industry, it is necessary to analyze the present situation of the shipbuilding industry and the financial situation of the shipbuilding enterprises. And analyzing the problems faced by enterprises from the perspective of capital structure is very meaningful to the shipbuilders with high capital operation. We are trying to analyze the determinants of capital structure of China's shipbuilding listed companies. 30 listed Chinese shipbuilding and listed companies have been designated as sample companies that can obtain financial statements for 13 consecutive years. They also divided 30 sample companies into shipbuilding, shipbuilding-related manufacturing, and shipbuilding-related transportation. Dependent variable is the debt level of the year, independent variable includes the debt level of the previous year, fixed asset ratio, profitability ratio, depreciation cost ratio and asset size. The regression model of the panel used to analyze determinants is capital structure. The results of the empirical analysis are as follows. First, a fixed-effect model for the entire entity showed that the debt-to-equity ratio and the size of the asset in the previous period had a positive effect on the debt-to-equity ratio in the current period. Second, the impact of the profitability ratio on the debt level in the prior term also supports the capital procurement ranking theory rather than the static counter-conflict theory. Third, it was shown that the ratio of the depreciation of the prior term, which replaces the non-liability tax effect, affects the debt-to-equity ratio in the current period.

Validation of NCS based Vocational Curriculum Procedures Developing Models Recognized by National Competency Standards Experts (국가직무능력표준 개발 전문가들이 인식하는 NCS 기반 직업교육과정 개발 절차 모형의 타당화)

  • Kim, Dong-Yeon;Kim, Jinsoo
    • 대한공업교육학회지
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    • v.40 no.1
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    • pp.64-86
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    • 2015
  • The objective of this study is to develop NCS-based vocational curriculum procedures developing models recognized by experts in the National Skill Standards and to verify them. As for a research method for efficiently achieving this study, Delphi research has been conducted three times based on the result of preliminary Delphi investigation, contents of in-depth interview (review and advice), and consideration of previous studies and literature research related to NCS in Korea and abroad. Major results of study in regard of validation of NCS-based vocational curriculum procedures developing models recognized by experts of National Skill Standards are as follows. First, validity of conceptual model(plan) of NCS-based vocational curriculum developing procedures was verified. According to the result of implementing it on 10 members of verification for Delphi preliminary investigation tools, the average was higher than 4.70, and validity of contents was turned out to be outstanding in 1.00. Secondly, validity of conceptual model(plan) of NCS-based vocational curriculum developing procedures was verified by using Delphi preliminary investigation tools. According to the result of verifying it in order on 10 members of verification for Delphi preliminary investigation tools, validity of contents on questions in each area from the development procedures model(plan) was all 1.00, and appropriateness of contents on the components was turned out to be outstanding in 1.00. In addition, validity of contents on interrelation and comprehensiveness of components in the development procedures model(plan) was all turned out to be very satisfying in 1.00. Third, Delphi investigation was implemented in three rounds on 26 Delphi panel members for the verification. As a result consistency rate of interrelation and comprehensiveness among questions in each area of development procedures model(plan), components on the contents, and elements was turned out to be outstanding in .75 from all of three rounds. Here, consistency rate from all three rounds was turned out to be 1.00, and convergence rate was shown to be .00 that very well satisfied the conditions(except for 1 question out of 29). Therefore, it was confirmed that opinion from Delphi panel members was completely consistent in the third round of Delphi investigation research. Such a result in the study was from how Delphi selection criteria were strictly reinforced, and, at the same time, implies how will of participation of Delphi panel members was important.

The Influence of Export Promotion Programs on SMEs' Export Performance: Focusing on Promising SMEs in Export (수출유망중소기업 지원프로그램이 수출성과에 미치는 영향에 관한 연구)

  • Jaekyung Ko;Chulhyung Park;Chang-Yong Han
    • Journal of Korea Society of Industrial Information Systems
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    • v.28 no.2
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    • pp.95-107
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    • 2023
  • The purpose of this study is to investigate the impact of export promotion programs (EPPs) on the export performance of small- and medium-sized enterprises (SMEs), with a specific focus on the influence of EPPs for promising SMEs in the export market. Using data on SMEs provided by the Industrial Bank of Korea (IBK), we conducted a fixed-effects model analysis from 2016 to 2019. Our study shows that EPPs have a positive and significant relationship with export intensity. Further analysis reveals that SMEs utilizing the financing support system provided by EPPs tend to improve their export growth and financial performance relative to their counterparts. While EPPs can assist SMEs with their internationalization efforts, their similarity and redundancy are recognized as potential limitations. This study complements the existing literature that has mainly focused on surveys and cross-sectional analysis by specifying the research subject to promising SMEs in export, and analyzing the effects of the export promotion program supported by IBK Industrial Bank. The results of this study are expected to provide implications for improving SMEs' export capabilities.

Comparative Analysis of the Local Economic Impact of University Student Startup in Korea and China (한중 대학생 창업의 지역경제효과에 대한 비교분석)

  • Jin-a Lim;Wang Xia
    • Asia-Pacific Journal of Business Venturing and Entrepreneurship
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    • v.19 no.2
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    • pp.181-196
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    • 2024
  • This study examines the impact of university graduate Startup rates on economic growth in the regions where universities are located, using panel data from 35 universities in 17 regions in Korea and 21 universities in 13 cities in China over a six-year period from 2016 to 2021. In Korea, a total of 35 universities were selected as part of the Ministry of Education's "University-initiated Startup" policy, including Startup-oriented universities, leading universities in Startup education innovation, Startup education bases, and excellent universities in Startup education, while in China, 21 universities were selected as part of the pilot bases established as part of the "Mass Entrepreneurship, Mass Innovation" policy. To analyze the economic impact of the universities on the regions where they are located, we aimed to conduct an empirical analysis of the economic impact using economic indicators of the economic growth rate of the regions where they are located. The results of the empirical analysis show that the Startup rate of university graduates in Korea and China both have a positive impact on the regional economic growth rate, but the Startup rate of local university graduates in Korea has a greater impact on the regional economy than in China. Based on the findings that the number of entrepreneurs produced by universities has a positive impact on the economic growth of their regions, this study draws implications for the role of universities and regions in revitalizing local economies and the establishment of systems to resolve the imbalance between metropolitan and non-metropolitan areas.

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