• The Journal of the Korea Contents Association
• /
• v.17 no.5
• /
• pp.677-685
• /
• 2017

This study was done to explore the relationship among mental health, self efficacy, happiness, suicidal ideation and related factors. Data collection from May 1, 2015 August 31 were enrolled in U-city. The questionnaire was filled out by 467 citizen in cities of Ulsan. Mental health was negatively correlated with self efficacy and was positively correlated with suicidal ideation. Self efficacy was positively correlated with happiness and negatively correlated with suicidal ideation. Also, happiness was negatively correlated with suicidal ideation of elementary student. Among the general characteristics, factors affecting suicidal ideation was marietal status, preferred mental health, and happiness significantly accounted for 43.3% of the variance for suicidal ideation. The most significant factor influencing suicidal ideation was mental health.

• The Journal of the Korea Contents Association
• /
• v.19 no.3
• /
• pp.89-99
• /
• 2019

This study was conducted to examine the mediating effects of social anxiety and academic self-efficacy in the relationship between adolescent covert narcissism and school life adaptation. The subjects were 423 middle school and high school students. The results of this study are as follows: First, covert narcissistic personality tendency had a negative correlation with school life adaptation(r=-.51, p<.01). Covert narcissism had significant positive correlation with social anxiety(r=.70, p<.01) but had negative correlation with academic self-efficacy(r=-.39, p<.01). Social anxiety showed a significant negative correlation with school life adaptation(r=-.50, p<.01), academic self-efficacy had a positive correlation with school life adaptation(r=.63, p<.01), and social anxiety had a negative correlation with academic self-efficacy(r=-.51, p<.01). Second, as a result of verifying the mediating effects of social anxiety and academic self-efficacy, academic self-efficacy has mediating effects on the relationship between covert narcissism and school life adaptation(${\beta}=.41$, p<.001), and social anxiety has no mediating effect on school life adaptation(${\beta}=-.05$, p<.001). The results of this study suggest that If adolescents with covert narcissism have difficulties in adapting to school life, increasing academic self-efficacy, especially self-control efficacy and self-confidence, may be helpful to improve adolescents' adaptation to school life.

• The Journal of the Korea Contents Association
• /
• v.17 no.2
• /
• pp.71-81
• /
• 2017

This study is to explore the relationship among self assertiveness, self efficacy, school adaptation and related factors. Data collection from July 11, 2015 July 20 were enrolled in two elementary school. The questionnaire was filled out by 905 elementary students from 3rd to 6th grade in cities of Busan and Ulsan. Self assertiveness for the elementary students was positively correlated with self efficacy and school adaptation. Also, self efficacy was positively correlated with school adaptation of elementary student. Among the general characteristics, factors affecting school adaptation were student-teacher's relationship, school grade, gender, friendship, confidence, self-control, preferred task difficulty, body language and contents of expression significantly accounted for 57.5%. The most significant factor influencing school adaptation was confidence.

• Communications for Statistical Applications and Methods
• /
• v.19 no.3
• /
• pp.507-516
• /
• 2012

We study time series models for seasonal time series data with a covariance structure that depends on time and the periodic autocorrelation at various lags $k$. In this paper, we introduce an ARMA model with periodically varying coefficients(PARMA) and analyze Arosa ozone data with a periodic correlation in the practical case study. Finally, we use a PARMA model and a seasonal ARIMA model for data analysis and show the performance of a PARMA model with a comparison to the SARIMA model.

• The Korean Journal of Applied Statistics
• /
• v.28 no.5
• /
• pp.1025-1034
• /
• 2015

Traditional Shewhart control charts assume that the observations are independent over time. Current progress in measurement and data collection technology lead to the presence of autocorrelated process data that may affect poor performance in statistical process control. One of the most popular charts for autocorrelated data is to model a correlative structure with an appropriate time series model and apply control chart to the sequence of residuals. Model parameters are estimated by an in-control Phase I reference sample since they are usually unknown in practice. This paper deals with the effects of parameter estimation on Phase II control limits to monitor autocorrelated data.

• Asia Marketing Journal
• /
• v.11 no.1
• /
• pp.29-38
• /
• 2009

Estimating the Bass diffusion model often creates a time-interval bias, which leads the OLS approach to overestimate sales at early stages and underestimate sales after the peak. Further, a specification error from omitted variables might raise serial correlations among residuals when marketing actions are not incorporated into the diffusion model. Autocorrelated disturbances may yield unbiased but inefficient estimation, and therefore invalid inference results. This phenomenon warrants a modified approach to estimating the Bass diffusion model. In this paper, the authors propose a modified Bass diffusion model handling autocorrelated disturbances. To validate the new approach, authors applied the method on two different data-sets: CT Scanners in the U.S, and FPD TV sales in Korea. The results showed improved model fit and the validity of the proposed model.

• The Korean Journal of Applied Statistics
• /
• v.12 no.2
• /
• pp.605-619
• /
• 1999

본 논문은 회귀분석에서 오차항의 1차 자기상관 존재 여부 및 그 값을 검정하는 방법을 베이지안 접근법으로 제안하였다. 이 방법은 모수공간의 다중분할로 인해 얻어진 여러 가설들에 대한 다중결정문제를 다중 베이즈요인에 관한 이론과 일반화 Savage-Dickey 밀도비를 이용한 사후확률 추정법을 합성하여 개발되었다. 이 방법은 기존의 검정법들에서 가능한 검정 뿐 아니라 이들이 해결할 수 없는 자기상관에 대한 다중결정문제에도 사용이 가능한데 그 효용성이 있다. 모의실험을 통하여 제안된 검정법의 유효성을 평가하였다.

• The Journal of the Acoustical Society of Korea
• /
• v.12 no.2E
• /
• pp.33-37
• /
• 1993

부호여기선형예측 형태의 음성 부호화기에 있어서주된 단점은 요구되는 계산량이많다는 것이다. 본 논문에서는 음질의 저하없이 자기상관에 근거한 피치예측기에서 피치 찾는 시간을 줄이는 간단한 방법을 제안한다. 기본적인 발상은, 피치찾는 과정에서 나타나는 자기상관 함수의 특성에 근거하여, 음의 봉우리의 폭을 이전 양의 봉우리의 폭을 이용하여 추정하여 건너 뜀으로써 피치 찾는 범위를 자기상관함수의 양의 값쪽으로 제한하는 것이다. 이렇게 피치찾는 구간에 제약을 가함으로써 요구되는 계산량은 감소하게 된다. 제안된 방법을 적용한 결과, 평균 약 40%의 계산량 감소를 음질의 저하없이 얻을 수 있다.

• Korean Journal of Culture and Social Issue
• /
• v.21 no.3
• /
• pp.481-496
• /
• 2015

The purpose of this study was to search for empirical evidence between internalized shame with self-control, aggression, and addiction potential. Also examine the differences between clinical group and normal group. The data was collected from 100 AA participants and 380 Non-AA participants. For measuring each variable, internalizes shame scale(ISS), self-control rating scale(SCRS), Buss-Durkee Hostility inventory(BDH), addiction potential scale(APS) were used. The survey result was analyzed with Pearson Correlation, Partial correlation and t-test. The results shows: Frist, the internalized shame and the aggression, the addiction potential shows a positive correlation but the self-control shows negative correlation. Second, after control self-control, internalized shame positively correlate to addiction potential and aggression. Third, clinical group recorded a higher level in internalized shame, aggression and addiction potential than normal group; a lower level in self-control. Based on the finding, the implications of understandings, the interventions, the limitations of this study, and the suggestions were discussed.

• Proceedings of the KSMRM Conference
• /
• 2001.11a
• /
• pp.173-173
• /
• 2001

목적： 1.5T 생체용 자기공명영상기기를 이용한 수소자기공명분광법으로 용액 내 물질의 정량분석에 대한 가능성을 알아보고자 하였다. 대상 및 방법： 0.01％에서 50％까지의 여러 농도를 갖는 포도당+증류수 혼합액의 모델용액을 만들어 생체용 자기공명영상기기와 시험관 nuclear magnetic resonance (NMR) 분광기에서 각각 수소 자기공명분광법을 시행하여 스펙트럼을 얻었다. 또한 12명의 당뇨환자에서 방광내의 소변에 대해 생체용 자기공명영상기기에서 스펙트럼을 얻고 소변을 추출하여 시험관 NMR 분광기에서 수소자기공명분광법을 시행하였다 각각의 방법으로 얻은 스펙트럼 상에서 포도당 농도에 따른 포도당/물 피크의 면적 비의 변화를 구하였고, 통계처리는 상관분석과 단순선형회귀분석을 시행하였고 회귀식을 산출하였다. 또한 생체용 자기공명영상기기를 이용하여 얻은 결과가 객관적인지 알아보기 위해 시험관 NMR 분광기에서 얻은 결과와의 상관관계를 분석하였다.