• Imaging Science in Dentistry
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• 제35권3호
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• pp.167-173
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• 2005

Purpose : To investigate the relationship between three-dimensional (3D) bone imaging parameters and trabecular strength in the mandible. Materials and Methods : Bone specimens were obtained from the mandibles of five male pigs weighing around 110 kg each. Of those, 43 samples were selected for 3D analysis and measured by micro-computed tomography. The five morphometric parameters were trabecular thickness (Tb.Th), bone specific surface (BS/BV), percent bone volume (BV/TV), structure model index (SMI) and degree of anisotropy (DA). Through destructive mechanical testing, strength parameters were obtained. Results : BV/TV, SMI, BS/BV, and Tb.Th showed significant correlations with strength parameters. DA did not show any correlation with the other parameters. In multiple linear regression analysis, BV/TV alone explained $43\%$ of the variance in Young's modulus. By stepwise inclusion of SMI, the variance in the Young's modulus was better explained up to $52\%$. Conclusions : Predicting trabecular strength in the mandible through architectural analysis would be possible. Further study is needed to establish the tendency and variety of trabecular architecture and strength according to the locations within the mandible.

• Journal of Preventive Medicine and Public Health
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• 제46권2호
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• pp.74-81
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• 2013

Objectives: The objective of this study was to evaluate the performance of risk-adjusted mortality models for colorectal cancer surgery. Methods: We investigated patients (n=652) who had undergone colorectal cancer surgery (colectomy, colectomy of the rectum and sigmoid colon, total colectomy, total proctectomy) at five teaching hospitals during 2008. Mortality was defined as 30-day or in-hospital surgical mortality. Risk-adjusted mortality models were constructed using claims data (basic model) with the addition of TNM staging (TNM model), physiological data (physiological model), surgical data (surgical model), or all clinical data (composite model). Multiple logistic regression analysis was performed to develop the risk-adjustment models. To compare the performance of the models, both c-statistics using Hanley-McNeil pair-wise testing and the ratio of the observed to the expected mortality within quartiles of mortality risk were evaluated to assess the abilities of discrimination and calibration. Results: The physiological model (c=0.92), surgical model (c=0.92), and composite model (c=0.93) displayed a similar improvement in discrimination, whereas the TNM model (c=0.87) displayed little improvement over the basic model (c=0.86). The discriminatory power of the models did not differ by the Hanley-McNeil test (p>0.05). Within each quartile of mortality, the composite and surgical models displayed an expected mortality ratio close to 1. Conclusions: The addition of clinical data to claims data efficiently enhances the performance of the risk-adjusted postoperative mortality models in colorectal cancer surgery. We recommended that the performance of models should be evaluated through both discrimination and calibration.

• 품질경영학회지
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• 제46권3호
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• pp.659-676
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• 2018

Purpose: Although emotional intelligence(EI) is seemingly related to the service-oriented citizenship behaviors(OCB) of contact employees who are directly interacting with customers, there are only a few studies examining the relationship between the two. This study attempts to provide empirical evidence for a link between EI and service-oriented OCB. In addition, when EI affects service-oriented OCB, this present study identifies which emotional labor strategy between surface acting and deep acting is to be chosen. Methods: The data of EI, service-oriented OCB, surface acting, and deep acting were collected from 142 sales employees who provided services in four large domestic department stores. Hierarchical regression analyses were performed to verify empirically the main effects between EI and service-oriented OCB and mediating effects of emotional labor strategy. Results: The results show that EI is significantly related to service-oriented OCB in the current sample. Results also indicate that the deep acting rather than surface acting reveals a mediating effect in the process of EI affecting service-oriented OCB. Conclusion: The results of this study shows that EI which has a conceptual basis for OCB, can be extended to service-oriented OCB, The results also contribute to expanding the understanding of the relationship between EI and service-oriented OCB by testing the effect of EI on service-oriented OCB through deep acting. Theoretical and practical implications are reviewed, and limitations of the study and suggestions for future research are addressed.

• 응용통계연구
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• 제20권2호
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• pp.323-332
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• 2007

이 논문에서는 이산코사인변환에 의해 유도된 주파수 공간상에서의 포트맨토검정법을 소개한다. 정상시계열의 경우 이산코사인변환 계수는 점근적으로 독립이고 분산은 자기공분산의 선형결합으로 표시된다. 백색잡음에 대한 이산코사인변환 계수의 공분산 행렬은 모든 대각원소가 시계열의 분산인 대각행렬이다. 시계열의 독립성을 검정하기 위해 계수들을 주파수 영역에 따라 2 또는 3개의 그룹으로 분할하고 그룹간의 분산을 비교하여 자료가 백색잡음인지 아닌지를 검정한다. 또한 계수의 제곱값이 반응변수이고 주파수 대역이 설명변수인 회귀모형에서 기울기를 검정하여 백색잡음 여부를 알아본다. 모의실험 결과를 보면 제안한 검정방법이 대부분의 경우 Ljung-Box 검정보다 높은 검정력을 가지는 것으로 나타났다.

• 한국학교ㆍ지역보건교육학회지
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• 제20권3호
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• pp.123-134
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• 2019

Objectives: The purpose of this study is to identify the problems of verbal violence that adolescents face in the post-human age, when the non-face-to-face media is increasing. Methods: A survey was conducted on 305 adolescents, aged 14 to 16 years of middle school and high school students. The data were analyzed with the SPSS 25.0. Results: As a result of conducting multiple regression analysis to identify the type of conversation that affects verbal abuse of adolescents, a model with a conversation with family, conversation with other people, messenger conversation such as KakaoTalk, and video chat conversation was selected. The amount of explanation was 11.4%. (R2 = .114) Of these, non-face-to-face conversations have been shown to increase verbal violence, and face-to-face conversations with family have, in turn, lowered the risk. As a result of t-testing to examine the effect of verbal abuse experience on the verbal violence index, the damage experience was significant in depression (p = .042) and impulsive aggression (p = .021). (P = .000). Conclusion: This study reiterates the importance of family dialogue along with the fact that the development of various non-face-to-face media in the Fourth Industrial Revolution can have a negative impact on adolescent mental health.

• 한국유통학회지:유통연구
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• 제11권1호
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• pp.1-20
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• 2006

장기적인 경기침체가 지속되고, 환경의 변화가 급격하게 발생하는 오늘날, 기업이 환경에 어떻게 대처하는가는 그 기업의 매우 중요한 과제가 되었다. 본 연구는 최근 그 중요성이 부각되고 있는 수요부문 환경의 풍요성과 동태성이 만족, 신뢰, 결속 등과 같은 유통경로 시스템의 성과에 어떠한 영향을 미치는지 발견하는 것을 그 목적으로 하고 있다. 특히 본 연구는 기존 연구와는 달리 유통경로 시스템의 수직적 통합 수준에 따라 환경의 영향이 어떻게 달라지는지를 규명하는데 그 구체적인 목적이 있다. 이와 같은 목적으로 기업형 유통경로 시스템(우유 회사와 보급소), 계약형 유통경로 시스템(치킨 프랜차이즈 본부와 가맹점), 전통형 유통경로 시스템(화장품 회사와 거래 전문점)을 대상으로 설문조사를 실시하였으며, 조절변수 회귀분석을 수행한 결과 환경의 풍요성은 유통업체의 만족, 신뢰, 결속을 강화시킨 반면, 동태성은 약화시켰고, 수직적 통합의 수준은 이러한 영향을 더욱 강화하는 역할을 하였다.

• 한국근적외분광분석학회:학술대회논문집
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• 한국근적외분광분석학회 2001년도 NIR-2001
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• pp.4111-4111
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• 2001

When a drug is prepared in a tablet, the active component represents only a small portion of the dosage form. The other components of the formulation include materials to assist in the dissolution, antioxidants, coloring agents and bulk fillers. The tablets are tested using approved testing methods usually involving separation and subsequent quantification of the active component. Tablets may also be tested by near-Infrared Reflectance spectrometry (NIRS). In the present study, based on NIRS and multivariate calibration methods, a novel and precise method is developed for direct determination of ascorbic acid in vitamin C tablet. Two different tablet formulations were powdered in three different sizes, 63-125 ${\mu}{\textrm}{m}$, and examined. Spectral region of 4750-4950 $cm^{-1}$ / was used and optimized for quantitative operations. Partial least squares (PLS) and multiple linear regression (MLR) methods were performed for this spectral region. The results of optimized PLS and MLR methods showed that reproducibility increase with decreasing grain size and standard error of calibration (SEP) of less than 1% w/w of ascorbic acid and a correlation coefficient of 0.998 can be achieved. The PLS method showed better results than MLR. Seven overdose and underdose samples (prepared in the laboratory to match marketed products) were tested by proposed and iodometric standard methods. A correlation between NIRS predicted ascorbic acid values and iodomet.ic values was calculated ($R^2$=0.9950). Finally, the direct analysis of individual intact tablets in their unit-dose packages (Blistering in aluminum and PVC foils) obtained from market were also carried out and a correlation coefficient of 0.9989 and SEP of 0.931% w/w of ascorbic acid were achieved.

• 한국보건간호학회지
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• 제4권2호
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• pp.25-34
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• 1990

The Purpose of this study were 1) to find out the characteristics of health promoting Ii festyles of the study samples, 2) to determine the relationships of physical health and mental health, 3) to determine the relationships of health promoting lifestyles and health status. The health promotion model was tested with a volunteer sample of 141 female students in a university in Seoul. The health promoting lifestyle was measured by the scales developed by Walker and Pender(1987). Health status was measured by Cornell medical Index. Pearson's product moment correlations and stepwise multiple regression technique were used to analyze the data. The results are summarized as follows; 1. The items with the highest frequency of the subscales of health promoting lifestyle were 'look forward to the future' $(133,\;95.0\%)$ in self actualization, 'Enjoy being touched and touching people close to me' $(122,\; 87.14\%)$ in relationships with others. The strongest correlation was between general competence In self care and nutritional practice(r=5388, P<. 0001). 2. Fatigability, frequency of illness, miscellaneous diseases, habit, mood and feeling patterns were predictive of mental health. 3. Total health promoting lifestyles explained $14\%$ of the variance for health status. Relationships with others explained $20.9\%$ of the variance for health status. In conclusion, because the most variance explained was $420.9\%$, there must be other variables not accounted for by the model. that influence health promoting behaviors. Psychological factors accounted for more variance than other factors. Intervention studies focused on psychological factors as a means of altering behaviors have great potential for the design of interventions to increase health promoting behaviors. Further testing of the model with this population should be done.

• 한국융합학회논문지
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• 제6권4호
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• pp.197-203
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• 2015

본 연구의 목적은 부모의 양육태도 중 부모 감독, 부모 애정, 비일관성이 청소년의 학교적응에 어떠한 영향을 미치는지를 분석하여 청소년의 학교적응을 돕는데 활용하고자 한다. 자료 분석을 위해 한국청소년정책연구원(2010)에서 실시한 한국아동 청소년패널조사 중1 패널 1차년도 자료를 사용하여 기술통계, t-검정과 ANOVA분석, 다중회귀분석을 실시하였다. 연구결과 부모의 양육태도는 중학생의 학교적응에 유의한 영향을 미치는 독립변수로 확인되었다. 즉, 부모의 감독수준과, 애정 수준이 높을수록 중학생의 학교적응 수준은 높아지고, 그와는 대조적으로 부모의 비일관성 수준이 높을수록 중학생의 학교적응 수준은 낮아지는 것으로 나타났다. 그러므로 중학생의 학교생활적응 수준을 높이기 위해서 부모의 긍정적인 양육태도를 활성화하고 발전시킬 수 있도록 다양한 방법을 강구해야 할 것이다.

• 한국융합학회논문지
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• 제8권8호
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• pp.299-305
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• 2017

본 연구는 2013년 지역사회건강조사 자료를 활용하여 2,162명을 최종분석 대상자로 선정하였다. 부산광역시 20~30대 여성의 걷기 일 수 관련 융복합적인 근린환경 요인을 파악하고자 다중회귀분석을 실시하였다. 본 연구의 결과, 부산광역시 20~30대 여성의 걷기 일 수는 유원지 면적이 클수록, 체육시설의 수가 많을수록, 직업이 없는 경우보다 학생인 경우에 증가하였다. 연령이 증가하고 상업지역의 면적이 클수록 걷기 일 수는 감소하였다. 이에, 지역사회 주민들의 요구를 듣고 전문가가 우선순위, 필요성, 효과성에 대해서 검증하여 지역사회 내 주민들의 여건에 맞는 차별화한 프로그램의 기획이 필요하다고 사료된다.