• Journal of the Korea Convergence Society
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• v.12 no.5
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• pp.313-326
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• 2021

This study was to introduce ecological momentary assessment and show how to apply it to real-world research. As preliminary study for sustainable development, the result explained growth model using senior's longitudinal data and suitability of multi-level model in EMA data with regression analysis. The total variance of dependent variable was determined through a base model with only intercept and approximately 47% of total variance was caused by individual differences and 53% by time point differences. Second model was used to verified that each individual has a different effect on the senior vitality and effect on time was not significant. This is because it is the result of a preliminary stage where treatment is not involved and there is no significant change in process of collecting EMA data without external intervention. Third model that add gender as an independent variable showed significant change in both time and gender. Finally compared the PRD for each model and found models that without gender variables fit the data more effectively. This suggests that studies dealing with longitudinal data such as EMA data should adopt multi-level model that can measure individual characteristics, taking into account respondents' time and context.

• The Journal of the Korea Contents Association
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• v.14 no.11
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• pp.722-731
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• 2014

The purpose of this study was to identify the relationship between multi-cultural family husbands' stress related to their wife and their psychological abuse based on the Stress theory of Lazarus et al. Data from 271 subjects that answered to all questions regarding the subjects' social demographic characteristics, and the husbands' stress related to their wife and their psychological abuse of their wife in statistical analyses. To analyze the data, a study model was set using multi-cultural family husbands' stress related to their wife as an independent variable and their psychological abuse of their wife as a dependent variable and the goodness-of-fit of the model for the data and the relationship between the variables were reviewed using a structural equation model. According to the results, the goodness-of-fit index of the model satisfied the statistical acceptable standard with CFI=0.909 and RMSEA=0.057. The relationship between the variables indicated that multi-cultural family husbands' stress related to their wife had significant effects on their psychological abuse of their wife. This result indicates the necessity of intervention for management of the husbands' stress in order to prevent multi-cultural family husbands' psychological abuse of their wife.

• The Journal of the Korea Contents Association
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• v.17 no.12
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• pp.299-307
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• 2017

The purpose of this study is to investigate mediated effect of spirituality on the relationship between perceived burdensomeness and death anxiety among the elderly. According to the result of this study, it was learned that perceived burdensomeness of aged people has significant correlations with a path of perceived burdensomeness to death anxiety, a path of spirituality to death anxiety and a path of perceived burdensomeness to spirituality. In short, higher perceived burdensomeness results in higher death anxiety, and higher spirituality lowers the death anxiety. This refers that perceived burdensomeness is predictor of death anxiety. In addition, it also indicates that mediated effect of spirituality has significant correlations with both full/partial mediator models - partial mediator model supposes both direct and indirect paths that differ from the way of perceived burdensomeness influences on death anxiety, while full mediator model supposes only indirect path. The result of this study suggests practical proposal to promote the quality of living of the elderly by reducing perceived burdensomeness that stimulates death anxiety and giving opportunity for experiencing spirituality to cope with death anxiety.

• The Journal of the Korea Contents Association
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• v.16 no.4
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• pp.250-261
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• 2016

This study was conducted to verify the mediation model of private self-consciousness on game addiction and aggression. Data from 439 boys were included in the analysis. The results are as follows. First, correlation analyses revealed that game addiction was positively correlated with aggression and private self-consciousness. Private self-consciousness was also positively correlated with aggression. Considering two factors of private self-consciousness, game addiction showed a significant positive correlation only with self-reflectiveness factor. Although two factors of private self-consciousness showed positive correlations with game addiction, regression analyses revealed that self-reflectiveness was the significant predictor of aggression. Second, the structural equation analyses showed that private self-consciousness, especially self-reflectiveness was found to partially mediate the influence of game addiction on aggression. Finally, limitations of this study and suggestions for further study were discussed.

• The Korean Journal of Applied Statistics
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• v.29 no.5
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• pp.907-920
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• 2016

This study suggests an outlier detection algorithm that uses quantile autoregressive model in time series data, eventually applying it to actual stock manipulation cases by comparing its performance to existing methods. Studies on outlier detection have traditionally been conducted mostly in general data and those in time series data are insufficient. They have also been limited to a parametric model, which is not convenient as it is complicated with an analysis that takes a long time. Thus, we suggest a new algorithm of outlier detection in time series data and through various simulations, compare it to existing algorithms. Especially, the outlier detection algorithm in time series data can be useful in finding stock manipulation. If stock price which had a certain pattern goes out of flow and generates an outlier, it can be due to intentional intervention and manipulation. We examined how fast the model can detect stock manipulations by applying it to actual stock manipulation cases.

• Korean Journal of Family Social Work
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• no.56
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• pp.105-133
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• 2017

The purpose of this study was to examine the relationship between family strength and career decision-making difficulties and the mediating effect or career self-regulation. The results of the present study suggested the significance of family strength and career self-regulation in understanding career decision-making difficulties. With 172 Korean college students, there were both significant direct and indirect effects from family strength to career decision-making difficulties. Specifically, the mediation roles of career self-regulation was confirmed. Comparing the partial mediation model with full mediation model, the partial mediation model fits better with the data. These results have significant clinical implication that counseling practitioners need to address the possible influence of family strength on college student's perceived difficulties in career decision-making process and to assist students develop appropriate level of competencies of regulating one's emotion, thoughts, and behavior related to career problems.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.12
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• pp.507-514
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• 2018

This study utilized latent growth curve modeling to investigate the trajectories of adolescent life satisfaction changes in middle and high school students. The effects of self-esteem, career identity, school learning activity, gender, and household earnings on life satisfaction changes were examined. Data was obtained from the Korea Child Youth Panel Survey (KYCPS), a longitudinal study following students for 7 years. Year 3-6 data was utilized. Results found that the life satisfaction trajectory resulted as a quadratic model in which individual differences were significant. Second, school learning activity used as a time variant variable had a positive significant effect on life satisfaction each year. Third, gender and self-esteem as time invariant variables had significant effects on initial levels while self-esteem had effects on the slope and quadratic change. Further implications and research issues are discussed.

• 한국노년학
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• v.37 no.3
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• pp.617-635
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• 2017

The aim of this study was to investigate both poverty and depression among older adults, focusing on the relationship of these two trajectories. For expanding the understanding about elderly poverty and depression, the study measured the longitudinal patterns of various transition in these two variables. The data for the study is 1st to 9th waves (2006-2014) of Korea Welfare Panel Study (KoWePS), and 4,431 older adults were used for the final analysis. For data analysis, Semi-parametric group-based modeling and Dual trajectory model were selected. The main results of this study were followings; First, The trajectory groups were identified: non-poverty, decrease poverty, increase poverty, remain high-poverty, chronic poverty groups and 4 trajectories of depression: stable, remain low-depression, risk of depression, chronic depression groups. Second, the study was tried to anticipate the longitudinal transition of poverty and depression status, and investigate the concurrent relationship in these two variables. It turned out that the stable poverty status led the stable depression, and vice versa. Based on these result, this study for elderly welfare were discussed to reduce risk for poverty and depression.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.74-78
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• 2009

우리 사회가 발전함에 따라 재해의 위험으로부터도 안전하게 살고자 하는 대중들의 욕구 또한 증가하고 있다. 하지만 최근의 기후변화와 이상홍수의 사례에서 볼 때 현재 우리가 처해 있는 자연재해로부터의 위협은 과거와는 상이하다는 것을 알 수 있다. 이러한 위협에 대처하기 위해서는 우리에게 노출된 재해의 특성을 평가하는 과정이 무엇보다 선행되어져야 한다. 홍수로 인한 피해는 대부분이 인명이나 재산피해가 주를 이루기 때문에 홍수위험도의 평가결과도 발생 가능한 인명이나 재산피해로 표현되는 것이 적절하다고 판단된다. 따라서 본 연구에서는 지역회귀분석을 적용하여 가능 홍수 피해금액을 추산하고, 이를 통해 각 지역별 홍수위험도를 평가하는 방법을 제안하였다. 지역회귀분석은 강우유출모형이나 확률분포모형의 매개변수들을 유역 특성인자들로 표현하기 위해 수문학 분야에서 사용되어져 왔으며 본 연구에서는 이 방법을 홍수 피해금액 추정에 응용하였다. 지역회귀방법의 절차는 먼저 계측지역에서는 홍수 피해금액과 시강우량 자료를 바탕으로 비선형회귀분석을 실시한 후 이 회귀식의 계수를 다시 해당 지역의 인문 사회 경제학적 인자들로 표현하였다. 이러한 방법을 통해 지역적 인자들이 홍수 피해에 미치는 영향을 정량적으로 분석할 수 있었으며 궁극적으로 미계측지역에서도 지역적 인자들을 통해 특정 빈도에 발생 가능한 홍수 피해금액을 추정할 수 있었다. 최종적으로 추정된 홍수 피해금액과 지역 총 자산의 비를 통해 홍수위험지도를 작성하였다. 본 연구결과를 수자원장기종합계획에서 홍수위험도 평가를 위해 사용된 홍수피해잠재능(Potential Flood Damage; PFD)과 비교해 보면 PFD에서는 각 인자들의 가중치 산정에서 전문가의 주관이 개입될 수 있다는 단점이 있었으나 과거 피해금액과의 상관관계를 분석한 본 연구에서는 이러한 단점을 극복할 수 있었다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2000.04a
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• pp.691-694
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• 2000

기존 LAN 환경에서 인터넷을 이용한 멀티미디어 실시간 전송과 같은 QoS 보장형 서비스에 대한 요구가 증대되면서, 고속의 ATM 기술을 LAN에 적용하는 기술들이 등장하였다. LANE(LAN Emulation)은 그러한 기술 대안들 중에서 campus network와 enterprise network에 많이 보급되고 있는 기술이다. 그러나 이러한 급격한 LANE 도입에 비하여 이의 효과적인 운용에 대한 연구는 많지 않은 실정이다. 본 논문에서는 LANE을 도입한 campus network의 최적 운영방안에 대하여 논한다. Broadcast 데이터 트래픽 관리에서 발생하는 규모성(Scalability) 문제로 인하여 전체 LANE망은 여러 개의 ELAN으로 나뉘어 관리된다. 이 때 하나의 ELAN은 마치 단위 LAN로써, Broadcast 데이터의 전송범위를 제한한다. 즉, 서로 다른 ELAN에 속하는 노드간에는 Broadcast 방식으로 데이터를 전송할 수 없게 된다. 그런데, IPX 등을 사용하는 대화형 시뮬레이션 게임 등과 같은 응용프로그램에서는 Broadcast 방식이 이용되므로, 서로 다른 ELAN에 속하는 노드간의 데이터 전송은 불가능하게 되거나 별도의 복잡한 과정을 개입시켜야 하는 비용이 발생한다. 따라서 규모성 문제해결을 위한 ELAN 구성(configuration)에는 위와 같은 비용이 수반된다. 본 연구에서는 LANE망을 여러 개의 ELAN으로 분할하는 경우에 블로킹(blocking) 되는 Broadcast 트래픽 규모를 해당 ELAN 구성의 비용으로 간주한다. 이 경우에 규모성을 고려한 ELAN의 최적 구현방안(optimal configuration)은 ELAN 구성을 위한 기술적 제약하에서 블로킹되는 Broadcast 트래픽을 최소화시키는 문제로 요약된다. 이는 다시 그래프 분할문제(graph partition problem)의 변형된 형태로 모형화 될 수 있다. 본 논문에서는 이러한 사항들을 고려하여 제시된 수리적 모형을 대상으로, genetic algorithm을 이용하여 최적 ELAN 구성을 위한 여러 파라미터들의 효과를 살펴보고, 이러한 결과들이 LANE 운영과 관련하여 가지는 함축적인 의미를 고찰한다.