• 동아시아식생활학회지
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• 제16권1호
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• pp.29-36
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• 2006

The purpose of this study was to measure the pizza purchasing behavioral characteristics of respondents and importances of factors affecting pizza purchase, to estimate the effects of attributes on pizza restaurant choice, and to predict probability of selecting a particular pizza restaurant The questionnaire consisted of two parts: The paired experimental profiles, purchasing behavior and importances of factors affecting pizza purchase. This study generated profiles of 16 hypothetical pizza restaurant based on the seven attributes. The profiles comprised 16 discrete sets of variables, each of which had two levels. For this study, researcher randomly selected 150 students of university as respondents. Twenty students did not complete the survey instrument, resulting in a final sample size of 129. All estimations were carried out using frequency, correlation, phreg procedure of SAS package. The results were as followed Based on the estimated model, the -2LL(B) statistic for a model with all explanatory variables was 5585.761 and the Chi-square statistic is 134.786 with 7 df (p<0.001). At p<0.001, we would reject the null hypothesis that the attributes do not influence choice. The parameter estimate for price was highest, followed by late delivery time, promised delivery time, money-back guarantee, discount, pizza variety, and pizza temperature. The result from this study suggested that there was an opportunity to increase market share and profit by improving operations so that customers receive discount and money-back guarantee simultaneously, and by reducing price, delivery time.

• 컴퓨터교육학회논문지
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• 제19권1호
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• pp.87-100
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• 2016

본 연구는 플립러닝 학습효과 변인과 학습효과 예측 변인 간의 구조적 관계를 검증하였다. 이를 위해 설문을 통해 얻은 중 고등학생 236명의 자료를 구조방정식모형 분석으로 구조적 관계를 확인하였다. 본 연구에서 밝혀진 결과는 다음과 같다. 첫째, 본 연구에서 플립러닝 관련 변인들이 성취도에 미치는 영향력을 살펴보면, 학습동기 변인이 가장 많은 기여를 하고 있고, 다음은 상호작용과 학습참여도 변인 순으로 영향을 미치고 있음을 알 수 있다. 둘째, 본 연구에서 플립러닝 관련 변인들이 인성에 미치는 영향을 살펴보면, 상호작용 변인이 가장 많은 기여를 하고 있고, 다음은 교수태도가 영향을 미치고 있어 인성형성에 무엇보다도 수업에서의 상호작용이 가장 큰 영향을 주고 있음을 알 수 있다. 셋째, 본 연구에서 연구모형 검증 결과 학습동기, 학습참여도, 교수태도, 상호작용과 성취도, 인성 간의 구조적 모형은 적합한 것으로 나타났다.

• Nuclear Engineering and Technology
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• 제24권3호
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• pp.274-284
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• 1992

가압경수로 최적 열수력 분석용 전산코드인 CATHRE의 모델 평가를 위하여 가압경수로의 가상 냉각재 상실사고시 원자로 용기내의 유동현상을 모의한 1/15축소의 CREARE 실험을 모의 계산하였다. 이 실험에서 주요변수들은 비상노심 탱각재 주입량과 아냉정도 그리고 계통압력 및 노심에서 발생되는 증기유량이지만. 본 연구에서는 우선 Downcomer에서 역방향유동의 정성적 분석에 촛점을 맞추었다. 모의 계산 결과와 실험 결과를 비교할 때 정량적인 값 뿐 아니라 변화의 경향에서도 차이가 나타난 것은 주로 적절하지 못한 일부의 수치해석 모델과 상간의 계면마찰 때문으로 판단된다. 따라서 매개변수적 민감도 분석을 통하여 CATHARE 전산코드의‘VOLUME’에 접한 접합점에서 운동량 보존방정식의 상세연구 혹은 다차원 분석을 통해서 이 경우의 물리적 현상을 보다 현실적으로 나타낼 수 있다는 결론을 얻었다.

• 대한간호학회지
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• 제46권1호
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• pp.118-127
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• 2016

Purpose: The study purposes were to construct and test structural equation modeling on the causal relationship of community residents' perceived quality of care, image, and role performance with satisfaction, intention to (re)visit and intention to recommend hospital. Methods: A cross-sectional survey was conducted with 3,900 community residents from 39 district public hospitals. The questionnaire was designed to collected information on personal characteristics and community awareness of public hospitals. Community awareness consisted of 6 factors and 18 items. The data were collected utilizing call-interview by a survey company. Research data were collected via questionnaires and analyzed using SPSS version 20.0 and AMOS version 20.0. Results: Model fit indices for the hypothetical model were suitable for the recommended level: ${\chi}^2=796.40$ (df=79, p<.001), GFI=.93, AGFI=.90, RMSR=.08, NFI=.94. Quality of care, image, and role performance explained 68.1% of variance in community awareness. Total effect of quality of care process factors on satisfaction (path coefficients=3.67), intention to (re)visit (path coefficients=2.67) and intention to recommend hospital (coefficients=2.45) were higher than other factors. Conclusion: Findings show that public hospitals have to make an effort to improve community image through the provision of quality care, and excellent role performance. Support for these activities is available from both Central and Local Governments.

• 대한간호학회지
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• 제47권5호
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• pp.624-637
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• 2017

Purpose: This study aimed to identify variables influencing the health-related quality of life (HRQoL) of adults with epilepsy in order to establish a structural model and design an intervention strategy to improve patients' HRQoL. Methods: The selected subjects were 212 patients with epilepsy aged between 18 and 70 years who were currently receiving treatment from hospital, general hospital, and clinic. They were surveyed using a structured questionnaire. Results: The goodness of fit measures of the final hypothetical model were as follows: ${\chi}^2/df=2.51$, GFI=.91, AGFI=.90, CFI=.96, SRMR=.04, NFI=.93, and RMSEA=.08. The major variables influencing the HRQoL of adults with epilepsy were epilepsy self-efficacy, depression, social support, and side effects of anti-epileptic drugs (AEDs), which were significant in the mentioned order, whereas the duration of AEDs use and perceived stigma did not show any effects. Six variables accounted for 75.6% of HRQoL. Variables having a direct and total effect on the HRQoL of adults with epilepsy were the side effects of AEDs, social support, epilepsy self-efficacy, and depression, and those with an indirect effect were the side effects of AEDs and social support. Conclusion: It is necessary to accurately identify the side effects of AEDs in adults with epilepsy and accurately observe the physical changes caused by depression. In addition, it is imperative to establish an active and effective nursing intervention program to strengthen the self-efficacy of the patients and to improve their quality of life through social support provided by family members and medical professionals.

• 가정과삶의질연구
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• 제24권6호
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• pp.95-116
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• 2006

The purpose of this study was to validate a hypothetical path model of maternal childhood attachment, emotions, parenting behaviors, and child behavioral problems. The research was conducted with 240 sets or mothers and their children 70 mother-child teams from seven counseling organizations including the Children's Counseling Clinic, Community Social Welfare Service Center, and Welfare Service Center for the Disabled in Seoul, Incheon, and Pyeongtaek, and 170 elementary school children from Seoul and their mothers. Consequently, a total of 200 mother-child teams were selected for this study. The data in this study were analyzed with SPSS 12.0 program and LISREL 8.3 program. The result of this study is as follows: (1) Examining the path of paternal attachment and the internalizing and externalizing behavioral problems, it was noted that paternal attachment had the indirect effect of anxiety and over-protection on the path to internalizing problems and the indirect effect of anxiety also noted is that there is a full-mediation of anxiety and over-protection between paternal attachment and the internalizing problems. (2) Examining the path of maternal attachment and the internalizing problems, it was noted that maternal attachment has direct effect on the internalizing problems. Maternal attachment has the indirect effect of self-esteem depression, anxiety and over-protection on the Path, and the indirect effect of self-esteem, anxiety and over-protection. (3) Examining the path of maternal attachment and the externalizing problems, it was noted that maternal attachment has direct effect on the externalizing problems and on the path to the externalizing problems, and maternal attachment has the indirect effect of depression, the indirect effect of self-esteem and authoritarian control, and the indirect effect of self-esteem and depression.

• Human Ecology Research
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• 제59권2호
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• pp.233-243
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• 2021

This study examined the longitudinal effects of media usage by early school-age children and of maternal parenting stress on children's school adjustment. The study focused on the mediating effect of executive function difficulty. Longitudinal data to examine the hypothetical model were drawn from the eighth (2015) through tenth (2017) waves of the Panel Study of Korean Children (PSKC) collected by the Korea Institute of Child Care and Education (KICCE). A total of 581 children (293 boys and 288 girls) and their mothers were included. Confirmatory factor analysis, structural equation model, and bootstrapping analysis were applied using SPSS 25.0 and Amos 26.0. The results are as follows. First, no significant correlation was found between early school-age children's media usage and maternal parenting stress. Second, neither media usage by early school-age children nor maternal parenting stress were found to directly affect children's school adjustment. Third, media usage by early school-age children and maternal parenting stress were shown to indirectly affect children's school adjustment via executive function difficulties. In other words, higher levels of media usage by early school-age children and maternal parenting stress during the first grade lead to greater executive function difficulties after a year, which, in turn, lead to a lower level of school adjustment in the third grade. This study indicates the need to develop practical support for the psychological wellbeing of mothers while they are performing their role as a parent and for children in maintaining suitable levels of media usage during early childhood.

• Journal of Astronomy and Space Sciences
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• 제39권1호
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• pp.1-10
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• 2022

The universe is thought to be filled with not only Standard Model (SM) matters but also dark matters. Dark matter is thought to play a major role in its construction. However, the identity of dark matter is as yet unknown, with various search methods from astrophysical observartion to particle collider experiments. Because of the cross-section that is a thousand times smaller than SM particles, dark matter research requires a large amount of data processing. Therefore, optimization and parallelization in High Performance Computing is required. Dark matter in hypothetical hidden sector is though to be connected to dark photons which carries forces similar to photons in electromagnetism. In the recent analysis, it was studied using the decays of a dark photon at collider experiments. Based on this, we studies double dark photon decays at lepton colliders. The signal channels are e⁺e^- → A'A' and e⁺e^- → A'A'γ where dark photon A' decays dimuon. These signal channels are based on the theory that dark photons only decay into heavily charged leptons, which can explain the muon magnetic momentum anomaly. We scanned the cross-section according to the dark photon mass in experiments. MadGraph5 was used to generate events based on a simplified model. Additionally, to get the maximum expected number of events for the double dark photon channel, the detector efficiency for several center of mass (CM) energy were studied using Delphes and MadAnalysis5 for performance comparison. The results of this study will contribute to the search for double dark photon channels at lepton colliders.

• 한국사회복지학
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• 제51권
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• pp.29-61
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• 2002

청소년들의 괴롭힘행동에 영향을 미치는 요인 및 괴롭힘 행동으로 인해 가해자에게 나타나는 결과를 조사하고자, 괴롭힘 가해자의 환경적 요인(부모와의 갈등, 부모의 지지결여, 교사의 지지결여, 친구로부터의 소외, 따돌림 및 괴롭힘에의 노출정도), 괴롭힘 행동의 유형(따돌림, 사회적, 언어적, 신체적, 도구적 괴롭힘)과 괴롭힘 행동으로 인해 가해자에게 나타나는 결과(쾌감, 죄책감, 피해자에 대한 비난적 태도, 자아존중감, 괴롭힘 행동의 정도)간의 상호작용을 조사할 수 있는 포괄적인 연구모델을 개발하였다. 본 연구에서 개발된 모델은 괴롭힘 가해의 경험이 있는 177명의 학생들로부터 수직된 설문조사 자료를 통하여 검증되었다. 경로분석(path analysis)을 사용하여 변인들간의 구조관계를 설명할 수 있는 최적의 이론구조모델이 선정되었다.(df=78, chi-square=57.266, RMSR=0.0514, GFI=0.953, CFI=1.00). 자료분석 결과, 의미 있는 인간관계(부모, 친구)에서 지지를 받지 못하거나 갈등을 경험할 때, 지속적으로 공격적 행동에 노출되어 있을 때 괴롭힘행동이 증가하는 것으로 나타났다. 부모의 지지결여 정도가 높을수록 사회적 괴롭힘과 신체적 괴롭힘이 증가되며, 부모와의 갈등이 클수록 언어적 괴롭힘과 도구적 괴롭힘이 증가되는 것으로 나타났다. 친구로부터 소외된다고 느낄수록 따돌림행동이 감소되는 것으로 나타났다. 아울러, 따돌림에의 노출정도가 클수록 신체적 괴롭힘이 증가되며, 괴롭힘에의 노출정도가 클수록 따돌림, 신체적 괴롭힘과 사회적 괴롭힘이 증가되는 것으로 나타났다. 한편, 괴롭힘 행동유형에 따라 가해자에게 나타나는 결과를 살펴볼 때, 따돌림은 가해자의 쾌감을 증대시키는 반면, 죄책감을 감소시키고, 피해자에 대한 비난적 태도를 증가시키는 것으로 나타났다. 언어적 괴롭힘과 신체적 괴롭힘은 쾌감을 증가시킨 반면, 도구적 괴롭힘은 쾌감을 감소시키는 것으로 나타났다. 신체적 괴롭힘은 죄책감을 증대시킨 반면, 도구적 괴롭힘은 죄책감을 감소시키는 것으로 나타났다. 아울러, 따돌림과 도구적 괴롭힘은 자아존중감을 증대시키는 반면, 사회적 괴롭힘은 자아존중감을 감소시키는 것으로 나타났다. 한편, 언어적 괴롭힘은 괴롭힘 행동의 정도를 증대시킨 반면, 도구적 괴롭힘은 괴롭힘행동 정도를 감소시키는 것으로 나타났다. 환경적 요인 중에서 부코의 지지결여와 친구로부터의 소외는 가해자의 자아존중감을 감소시키며, 부모의 지지결여는 가해자의 죄책감을 감소시키는 것으로 나타났다. 아울러, 따돌림과 괴롭힘에 노출되는 정도가 클수록 괴롭힘 행동의 정도가 증대되는 것으로 나타났다. 본 연구 결과를 바탕으로, 개인적 차원에서 가해자의 감정 및 태도의 변화를 위한 개입방안, 의미 있는 인간관계 개선 및 사회적지지 증진을 위한 대인관계 개선방안, 괴롭힘행동의 감소 및 예방을 위해 학교환경을 총체적으로 재조직하기 위해 필요한 다양한 개입전략이 제시되었다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제10권5호
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• pp.52-60
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• 2005

본 연구에서는 기존 연쇄 말콥체인(Coupled Markov Chain, CMC) 확률식의 연산 경직성을 개선하기 위하여 일반화 된 2차원 연쇄 말콥체인(Generalized Coupled Markov Chain, GCMC) 확률식이 개발되었다. 또한 개발된 확률식에 근거하여 평면상에서 무작위적으로 분포하는 참조정보를 효율적으로 활용하는 연산 알고리듬이 개발되었다. 개발된 모델은 대안적 지구통계 기법으로의 새로운 기능성을 제시한다. 본 연구를 통해 새롭게 개발된 GCMC 확률식은 기존 CMC 확률식에 비해 보다 유연한 참조 정보 활용 가능성을 가지며 특수한 경우로 기존 CMC 확률식이 유도되었다. 또한 순차적 연산의 인위적 오류 발생 기능성 및 실제 야외 데이터의 낮은 빈도를 고려하여 무작위로 추출된 위치에서 각 범위를 이용한 연산 알고리듬이 제안되었다. 개발된 모델은 가상의 2차원 토양도에 적용되었으며 기존 지구통계 기법인 SIS에 비하여 손색이 없는 새로운 지구통계 기법으로 토양 및 지질을 포함한 다양한 예측에 이용 될 수 있는 가능성을 보였다. 낮은 빈도로 샘플링 된 지시자에 대해서는 기존 지구통계 기법과 마찬가지로 저평가되는 현상을 보였으며 이를 보완하기 위하여 다양한 소스의 데이터 융합 등을 바탕으로 한 계속적인 연구가 요구된다.