• The Korean Journal of Applied Statistics
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• v.26 no.1
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• pp.131-139
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• 2013

Support vector machines(SVM) may perform poorly in the presence of noise variables; in addition, it is difficult to identify the importance of each variable in the resulting classifier. A feature selection can improve the interpretability and the accuracy of SVM. Most existing studies concern feature selection in the linear SVM through penalty functions yielding sparse solutions. Note that one usually adopts nonlinear kernels for the accuracy of classification in practice. Hence feature selection is still desirable for nonlinear SVMs. In this paper, we compare the performances of nonlinear feature selection methods such as component selection and smoothing operator(COSSO) and kernel iterative feature extraction(KNIFE) on simulated and real data sets.

• The Journal of the Korea Contents Association
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• v.18 no.12
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• pp.197-207
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• 2018

This study analysis effect of social support and career maturity on readiness for independent living of run away youths using drop in center. This result peer support had more influence on preparing for independent living than in supporting the working class and career maturity had a huge impact on all the low-variables of preparing for independent living. Career maturity level for run away youths paly an important role in preparing for independent living just like general youths. On the base this study propose supporting system preparing for independent living, worker empowerment, drop in center's role establish for independent living.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.11a
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• pp.261-261
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• 2009

Anode 지지형 SOFC의 Anode 지지층 제조에 있어 Ni의 입성장이 일어나면 전극의 반응면적이 줄어들어 전기전도도가 감소되므로 소결체의 제조공정이 매우 중요하다. 기공형성제의 함량이 증가할수록 기공율도 증가하였고 기공체의 함량이 20%를 넘어가면서 기공율은 오히려 줄고 밀도도 감소하였다. Anode 지지체는 $1200^{\circ}C$ 이상에서 열처리하여야 입자간 소결이 이루어지며 승온 속도를 $2.5^{\circ}C$ 유지하여 20% 수준의 기공률을 형성하였다. 소결한 음극지지체를 환원하였을 때 35%수준의 개기공을 형성하였고 전해질과의 접착성도 우수하였다.

• Proceedings of the Korean Geotechical Society Conference
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• 2007.09a
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• pp.115-123
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• 2007

설계 하중이 큰 대형 구조물의 기초로 많이 사용되는 현장타설말뚝은 현장에서 지반을 굴착하여 조립된 철근망을 삽입한 후, 콘크리트를 타설하여 제작되므로 복잡한 시공 과정과 현장의 특수한 지하수 및 지반 조건으로 인하여 현장타설말뚝의 내부에는 결함이 포함될 수 있다. 발생 가능한 대표적인 결함으로 연약한 말뚝 선단, 말뚝체 콘크리트의 품질 저하, 말뚝과 지반의 접촉 불량, 주 철근의 부식 등이 있으며, 이들 결함을 감지하기 위한 건전도 시험법으로 공대공초음파 검층, 충격반향시험, 충격응답시험, 감마-감마 검층법 등이 있다. 결함은 말뚝의 수평지지력을 감소시키며, 일반적으로 발생하는 비대칭단면 결함에 의한 응력 집중현상과 수평 하중에 의한 휨모멘트는 연직지지거동에 영향을 준다. 따라서 결함을 감지하고 평가하는 것이 현장타설말뚝의 품질관리에 있어 매우 중요하다.

• The Journal of the Korea Contents Association
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• v.15 no.6
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• pp.358-369
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• 2015

This study examined the status of and factors associated with drinking experience, smoking experience, and internet addiction among elementary school students. Cross-sectional data were collected by questionnaire from 1,061 children among the fifth and sixth grades in public elementary schools in Gyeonggi province. The prevalence of drinking and smoking experience, internet addiction of participants was 22.7%, 2.9%, and 4.2% respectively. Multiple logistic regressions showed that the likelihood of drinking and smoking experience, and internet addiction was commonly higher with those who was a male and had higher aggression level. The likelihood of drinking experience was lower with those who had higher family support, while was higher with those who had higher friend support. That of internet addiction was lower with having higher friend and teacher support. Prevention strategies to prevent drinking, smoking, and internet addiction among elementary school students should consider student's gender, control aggression, and enhance social support in family and school environments.

• Journal of the Korean GEO-environmental Society
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• v.5 no.1
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• pp.75-84
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• 2004

Stone column is one of the soft ground improvement method, which can enhance ground conditions such as the settlement reduction and the increasement of bearing capacity with applying the crushed stone instead of sand. In recent, general construction material, sand is in short of supply. Therefore, the bearing capacity improvement by the stone column is considered as the alternative method needed in many cases so the bearing capacity estimation is considered as important point. Nevertheless, adequate estimation methods to predict bearing capacity of stone column considering stone column and improvement effect of ground is not yet prepared. For the analysis of above mentioned points, the behavior of stone column were simulated as numerically on various property cases of crushed stone and surrounded ground. Through the numerical analysis of simulation results, the formula for the bearing capacity estimation of stone column was suggested. This formula was verified by comparing the prediction result of in situ test.

• Survey Research
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• v.13 no.1
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• pp.113-134
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• 2012

It is very vital for the presidential preference not only to be a political achievement of the president himself, but also to be an influential base of people-related policy and its implementation. The purpose of this study is to provide the newly developing ideas to compose an appropriate question and to point out the present problems in the utilization of survey results. At first, it turned out to be inappropriate to make a question for evaluation of presidential job approval in the perspective of questionnaire planning. As the respondents were not informed of what the president did, so they were more likely not to know whether the president did well or not. Secondly, the correlation analysis has been made between the evaluation question of the presidential job approval and policy-related questions including the direct one for the presidential preference in the aspect of statistical analysis. Through this process, evaluation of the presidential job approval is not accountable and the direct question for the presidential preference is at best explainable. In conclusion, it seems more persuasive to compare the statistical outcome of the presidential preference which has been derived of to the high rating what the respondents think comprehensively not depending on a subjective decision by mass media.

• Proceedings of the Korean Association for Survey Research Conference
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• 2011.10a
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• pp.63-81
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• 2011

The purpose of this study is to provide the newly developing ideas to compose an appropriate question and to point out the present problems in the utilization of survey result. It is very vital for the presidential preference not only to be a political achievement of the President himself, but also to be a influential base of people-related policy and its implementation. At first, it turned out to be inappropriate to make a question for the evaluation of presidential working performance in the perspective of questionnaire planning. As the respondents were not informed of what the President did, so they were more likely not to know whether the President did well or not. Secondly, the correlation analysis has been made between the evaluation question of the presidential working performance and policy-related questions including the direct one for the presidential preference in the aspect of statistical analysis. Through this process, the evaluation of the presidential working performance is not accountable and the direct question for the presidential preference is at best explainable. In conclusion, it seems more persuasive to compare the statistical outcome of the presidential preference which has been derived of to the high rating what the respondents think comprehensively not depending on a subjective decision by mass media.

• Industry Promotion Research
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• v.8 no.4
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• pp.147-162
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• 2023

This study explored the experience of social support in the education and rearing of children of immigrant women through international marriage and found its essential meaning. First of all, the husband's social support was very important, but the relationship with the husband had a different effect on childrearing and education. Parents-in-law had a positive and negative impact on child rearing and education of them due to cultural conflicts between the two countries. Their own mother was a strong support that gave them great strength just by being there, and as their children grew up, they regarded their mother as the source of bilingual education for their children. Other supporters around them were Korean friends who connected Korean society by sharing information on child care and education. Friends who spoke and communicated in their native language were emotional and psychological supporters that bonded the same experience of parenting and education for their children. In conclusion, the research participants expected a better life for themselves and their children by using a multi-layered social support system as well as a transnational family network in the process of child education and care. Accordingly, it was proposed to systematically improve the laws, systems, and policy support so that the social support system can be further strengthened at the family, community, and transnational levels for the education and care of children of immigrant women through international marriage.

• Korean Journal of Social Welfare
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• v.51
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• pp.141-156
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• 2002

The relation among social support, depressive symptoms, and living arrangements were examined in a non-random sample of 175 adults age 60 and older. A convenience sample was obtained through a personal interview. A structural equation modeling approach was used to explore the role of social support in the relation between the living arrangements of elderly Koreans and their level of depressive symptoms. These results are consistent with previous analyses suggesting that social support plays a significant role in moderating depressive symptoms, in relation to negative living arrangements among older Korean populations (the buffering-effect hypothesis).