• Title/Summary/Keyword: By Variables

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Analysis of the Impact of US, China, and Korea Macroeconomic Variables on KOSPI and VKOSPI (미국·중국·한국 거시경제변수가 한국 주식수익률 및 변동성 지수 변화율에 미치는 영향 분석)

  • Jung-Hoon Moon;Gyu-Sik Han
    • Asia-Pacific Journal of Business
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    • v.15 no.1
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    • pp.209-223
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    • 2024
  • Purpose - This article analyzes the impact of macroeconomic variables of the United States, China, and Korea on KOSPI and VKOSPI, in that United States and China have a great influence on Korea, having an export-driven economy. Design/methodology/approach - The influence of US, China, and Korea interest rates, industrial production index, consumer price index, US employment index, Chinese real estate index, and Korea's foreign exchange reserves on KOSPI and VKOSPI is analyzed on monthly basis from Jan 2012 to Aug 2023, using multifactor model. Findings - The KOSPI showed a positive relationship with the U.S. industrial production index and Korea's foreign exchange reserves, and a negative relationship with the U.S. employment index and Chinese real estate index. The VKOSPI showed a positive relationship with the Chinese consumer price index, and a negative relationship with the U.S. interest rates, and Korean foreign exchange reserves. Next, dividing the analysis into two periods with the Covid crisis and the analysis by country, the impact of US macroeconomic variables on KOSPI was greater than Chinese ones and the impact of Chinese macroeconomic variables on VKOSPI was greater than US ones. The result of the forward predictive failure test confirmed that it was appropriate to divide the period into two periods with economic event, the Covid Crisis. After the Covid crisis, the impact of macroeconomic variables on KOSPI and VKOSPI increased. This reflects the financial market co-movements due to governments' policy coordination and central bank liquidity supply to overcome the crisis in the pandemic situation. Research implications or Originality - This study is meaningful in that it analyzed the effects of macroeconomic variables on KOSPI and VKOSPI simultaneously. In addition, the leverage effect can also be confirmed through the relationship between macroeconomic variables and KOSPI and VKOSPI. This article examined the fundamental changes in the Korean and global financial markets following the shock of Corona by applying this research model before and after Covid crisis.

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.

A study on the Predictors of criteria on Clothing Selection (의복선택기준 예측변인 연구)

  • Shin, Jeong-Won;Park, Eun-Joo
    • Journal of the Korean Society of Costume
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    • v.13
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    • pp.123-134
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    • 1989
  • The purpose of this study was to identify the predictable variables of criteria on clothing selection. Relationships among criteria on clothing selection, psychological variable, lifestyle variable, and demographic variable were tested by Pearsons' correlation coefficients and One-way ANOVA. The predictors of criteria on clothing selection were identified by Regression. The consumers were classified into several benefit-segments by criteria on clothing selection, and then, the character of each segment were identified by Multiple Discriminant Analysis. Data was obtained from 593 women living in Pusan by self-administered questionnaires. The results of the study were as follows; 1. Relationship between criteria on clothing selection and relative variables. 1) The important variables to criteria on clothing selection were "down-to-earth-sophisticated", "traditional-morden", "conventional-different", "conscientious-expendient", need for exhibitionism, need for sex, fashion / appearance. 2) The important factor of clothing selection criteria was comfort and it has significant difference among ages. 3) The higher of social-economic status have the more appearance-oriented selection. 2. Predictors of criteria on clothing selection. There were several important predictors of criteria on clothing selection like lifestyle, need, and self-image. Especially, fashion / appearance in lifestyle variable was very important. 3. Segmentation by the criteria on clothing selection. There are four groups Classified by the criteria on clothing selection, that is practical-oriented group, appearance-oriented group, practical and appearance-oriented group, and indifference group. The significant discriminative variables were Fashion / appearance factor, need for exhibitionism, and need for sex. The result of this study can be used for a enterprise to analysis the consumer and to build the strategy of advertisement clothing.

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Grade 7th Pupils' Ideas about Identification and Control of Variables in Inquiry Problems (중학교 1학년 학생들의 탐구 문제에 대한 변인 판별 및 통제)

  • Kim, Jae-Woo;Oh, Won-Kun;Pak, Sung-Jae
    • Journal of The Korean Association For Science Education
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    • v.19 no.4
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    • pp.674-683
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    • 1999
  • The purpose of this study was to compare the ideas of pupils with that of the scientists about controlling and identifying of variables, in the two cases: open or guided inquiry. The subjects were the 7th grade boys and girls in a school, in Seoul, Korea. For the guided inquiry, the problems were given by the experiments of pupils' text. Pupils were asked to identify the variables in the experiments. For the open inquiry, pupils set their own inquiry problem. The pupils whose marks are within upper one-third of three classes were chosen. Pupils' ideas on variables were investigated in the design of experiment for their problems. In that, questionnaire developed by researchers was used. In the former, many of the pupils identify just only one variable despite of the fact there were two independent or dependent variables in the experiments. In the latter, the number of independent variables increased two or three. However, pupils do not control independent variables: they vary two independent variables simultaneously in the design of experiment. From these, we compared the pupils' ideas on variables with the scientists'

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A Study on the Leisure Activities and Their Constraints of Housewives (주부의 여가활동과 여가제약요인에 관한 연구)

  • 홍성희
    • Journal of the Korean Home Economics Association
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    • v.29 no.3
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    • pp.153-174
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    • 1991
  • The purpose of this study is to examine the leisure activities of housewives, to identify the factors that influence leisure activities, and to explore the factors contribute to their life satisfaction. So, this study analyses the effects of econo-demographic and socio-cultural variables and of leisure constraint factors on the leisure activities of housewives. And it deals with how these variables and the leisure activities influence life satisfaction of housewives. For these puoposes, 508 housewives residing in Seoul & Daegu were selected for interviews. For data analysis such statistical methods as ANOVA, t-test, Pearson's correlation, adn Multiple Regression Analysis can be summarised. The main findings of the research are as follows: 1. Leisure acivities are classified in Self-developmental, Home-oriented, Time-consuming, Social and Children-concerned types by the technique of factor analysis. The average particiation level was high in Time-consuming type, but low in Self-developmental type. 2. The participation level of leisure activities shows significant differences by selected variables: The Self-developmental type shows significant differences by housewife's education level, income, husband's occupation, role orientation, home management type and leisure constraints. And Children-concerned type was differed to number of family nember, number of children, age of housewife and age of housewife and age of the youngst child. 3. The preference level of leisure activities differ by housewife's education level, income, husband's occupation, home management type and leisure constraints in the Self-developmental and the Social type. And the preference level of Home-oriented leisure activities was high in the middle class of income and husband's occupation. 4. The preference and participation level of leisure activities show differences. And the variables affecting the differences were housewife's age, education level, home management type, role orientation, leisure constraint factors in the Self-developmental type, and were demographic variables such as number of family member, housewife's age in the Home-oriented type. 5. The variables which affected the level of life satisfaction independently were leisure space, income, the participation level of the Self-developmental and the Social type and the preference level of the Self-developmental type.

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An Analysis of Factors Relating to Agricultural Machinery Farm-Work Accidents Using Logistic Regression

  • Kim, Byounggap;Yum, Sunghyun;Kim, Yu-Yong;Yun, Namkyu;Shin, Seung-Yeoub;You, Seokcheol
    • Journal of Biosystems Engineering
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    • v.39 no.3
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    • pp.151-157
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    • 2014
  • Purpose: In order to develop strategies to prevent farm-work accidents relating to agricultural machinery, influential factors were examined in this paper. The effects of these factors were quantified using logistic regression. Methods: Based on the results of a survey on farm-work accidents conducted by the National Academy of Agricultural Science, 21 tentative independent variables were selected. To apply these variables to regression, the presence of multicollinearity was examined by comparing correlation coefficients, checking the statistical significance of the coefficients in a simple linear regression model, and calculating the variance inflation factor. A logistic regression model and determination method of its goodness of fit was defined. Results: Among 21 independent variables, 13 variables were not collinear each other. The results of a logistic regression analysis using these variables showed that the model was significant and acceptable, with deviance of 714.053. Parameter estimation results showed that four variables (age, power tiller ownership, cognizance of the government's safety policy, and consciousness of safety) were significant. The logistic regression model predicted that the former two increased accident odds by 1.027 and 8.506 times, respectively, while the latter two decreased the odds by 0.243 and 0.545 times, respectively. Conclusions: Prevention strategies against factors causing an accident, such as the age of farmers and the use of a power tiller, are necessary. In addition, more efficient trainings to elevate the farmer's consciousness about safety must be provided.

Feature selection for text data via topic modeling (토픽 모형을 이용한 텍스트 데이터의 단어 선택)

  • Woosol, Jang;Ye Eun, Kim;Won, Son
    • The Korean Journal of Applied Statistics
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    • v.35 no.6
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    • pp.739-754
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    • 2022
  • Usually, text data consists of many variables, and some of them are closely correlated. Such multi-collinearity often results in inefficient or inaccurate statistical analysis. For supervised learning, one can select features by examining the relationship between target variables and explanatory variables. On the other hand, for unsupervised learning, since target variables are absent, one cannot use such a feature selection procedure as in supervised learning. In this study, we propose a word selection procedure that employs topic models to find latent topics. We substitute topics for the target variables and select terms which show high relevance for each topic. Applying the procedure to real data, we found that the proposed word selection procedure can give clear topic interpretation by removing high-frequency words prevalent in various topics. In addition, we observed that, by applying the selected variables to the classifiers such as naïve Bayes classifiers and support vector machines, the proposed feature selection procedure gives results comparable to those obtained by using class label information.

A Study on the Revitalization of Tourism Industry through Big Data Analysis (한국관광 실태조사 빅 데이터 분석을 통한 관광산업 활성화 방안 연구)

  • Lee, Jungmi;Liu, Meina;Lim, Gyoo Gun
    • Journal of Intelligence and Information Systems
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    • v.24 no.2
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    • pp.149-169
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    • 2018
  • Korea is currently accumulating a large amount of data in public institutions based on the public data open policy and the "Government 3.0". Especially, a lot of data is accumulated in the tourism field. However, the academic discussions utilizing the tourism data are still limited. Moreover, the openness of the data of restaurants, hotels, and online tourism information, and how to use SNS Big Data in tourism are still limited. Therefore, utilization through tourism big data analysis is still low. In this paper, we tried to analyze influencing factors on foreign tourists' satisfaction in Korea through numerical data using data mining technique and R programming technique. In this study, we tried to find ways to revitalize the tourism industry by analyzing about 36,000 big data of the "Survey on the actual situation of foreign tourists from 2013 to 2015" surveyed by the Korea Culture & Tourism Research Institute. To do this, we analyzed the factors that have high influence on the 'Satisfaction', 'Revisit intention', and 'Recommendation' variables of foreign tourists. Furthermore, we analyzed the practical influences of the variables that are mentioned above. As a procedure of this study, we first integrated survey data of foreign tourists conducted by Korea Culture & Tourism Research Institute, which is stored in the tourist information system from 2013 to 2015, and eliminate unnecessary variables that are inconsistent with the research purpose among the integrated data. Some variables were modified to improve the accuracy of the analysis. And we analyzed the factors affecting the dependent variables by using data-mining methods: decision tree(C5.0, CART, CHAID, QUEST), artificial neural network, and logistic regression analysis of SPSS IBM Modeler 16.0. The seven variables that have the greatest effect on each dependent variable were derived. As a result of data analysis, it was found that seven major variables influencing 'overall satisfaction' were sightseeing spot attraction, food satisfaction, accommodation satisfaction, traffic satisfaction, guide service satisfaction, number of visiting places, and country. Variables that had a great influence appeared food satisfaction and sightseeing spot attraction. The seven variables that had the greatest influence on 'revisit intention' were the country, travel motivation, activity, food satisfaction, best activity, guide service satisfaction and sightseeing spot attraction. The most influential variables were food satisfaction and travel motivation for Korean style. Lastly, the seven variables that have the greatest influence on the 'recommendation intention' were the country, sightseeing spot attraction, number of visiting places, food satisfaction, activity, tour guide service satisfaction and cost. And then the variables that had the greatest influence were the country, sightseeing spot attraction, and food satisfaction. In addition, in order to grasp the influence of each independent variables more deeply, we used R programming to identify the influence of independent variables. As a result, it was found that the food satisfaction and sightseeing spot attraction were higher than other variables in overall satisfaction and had a greater effect than other influential variables. Revisit intention had a higher ${\beta}$ value in the travel motive as the purpose of Korean Wave than other variables. It will be necessary to have a policy that will lead to a substantial revisit of tourists by enhancing tourist attractions for the purpose of Korean Wave. Lastly, the recommendation had the same result of satisfaction as the sightseeing spot attraction and food satisfaction have higher ${\beta}$ value than other variables. From this analysis, we found that 'food satisfaction' and 'sightseeing spot attraction' variables were the common factors to influence three dependent variables that are mentioned above('Overall satisfaction', 'Revisit intention' and 'Recommendation'), and that those factors affected the satisfaction of travel in Korea significantly. The purpose of this study is to examine how to activate foreign tourists in Korea through big data analysis. It is expected to be used as basic data for analyzing tourism data and establishing effective tourism policy. It is expected to be used as a material to establish an activation plan that can contribute to tourism development in Korea in the future.

Analysis of Individual, Family and School Environment Factors Related to Children's Bullying Behaviors (또래괴롭힘 행동경향성에 관련된 개인, 가족 및 학교환경변인 탐색)

  • Kim, Youn-Hwa;Han, Sae-Young
    • Journal of the Korean Home Economics Association
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    • v.48 no.2
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    • pp.95-111
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    • 2010
  • We examined gender-specific behaviors in children and classified types of bullying behavior among 1,181 fifth and sixth grade elementary schools students. Differences were identified in individual variables, family environment variables, and school environment variables. Furthermore the behavioral tendencies of those variables towards bullying were also investigated. Collected data were subjected to descriptive and comparative statistical analysis using the SPSS program(Ver 15.0). Results showed that tendency towards bullying was gender specific. Bullying behavior, reinforcing behavior, assistant behavior, and onlooking behavior in boys were influenced by individual factors only. However, defending behavior in boys was influenced by individual and school factors, while victimizing behavior was influenced by individual and family factors. In girls, onlooking behavior was only influenced by individual factors, while reinforcing behavior was influenced by individual and family factors. Bullying behavior, defending behavior, assistant behavior, and victimizing behavior in girls were influenced by individual, family, and school factors.

The Impact of Demographic Variables on Family Value Orientations and Gender Role Attitudes : The International Comparison (가족가치관과 성역할태도에 영향을 미치는 인구학적 변인 : 국제비교 분석)

  • Baek, Ju-Hee
    • Journal of Families and Better Life
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    • v.27 no.3
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    • pp.239-251
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    • 2009
  • This study aims to examine how much Korean's family value orientations and gender role attitudes are different from those of U.S.A., Sweden, and Japan, and how demographic variables influence family value orientations and gender role attitudes across the countries. By using 2004 Korea General Social Survey data and 2002 International Social Survey Program family module, multiple regression analyses showed that Korean's family value orientations and gender role attitudes were much more traditional than those of U.S.A., Sweden, and Japan, even after controlling demographic variables. Furthermore, each country showed a distinct pattern in the impact of demographic variables on family value orientations and gender role attitudes. Among the demographic variables, age and marital status were statistically significant indicators of family value orientations for all the countries. However, gender, the year of education, and employment status effected on family value orientations only in some countries. The findings of this study showed that Korea was still traditional in terms of family value orientations and gender role attitudes, compared with U.S.A, Sweden, and Japan. Although family value orientations were more traditional in Korea than in the other countries, all the countries showed similar patterns of explaining mechanism in the effect of demographic variables on family value orientations. People who were men and married were likely to be more traditional than those who were women and unmarried. However, gender role attitudes showed interesting results. All the demographic variables were significant predictors of gender role attitudes for Korea, whereas only some of demographic variables were statistically significant indicators of gender role attitudes for other countries. That is, Korean society showed strong attitudinal differences on the basis of demographic variables. The implication of these differences was discussed.