• 대한치과기공학회지
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• 제45권3호
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• pp.74-80
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• 2023

Purpose: This study aimed to evaluate the fit of the anterior and posterior teeth printed using two light-curing three-dimensional (3D) printers. Methods: Anterior and posterior single crowns were designed using dental software and were printed using 2 types of 3D printers, liquid crystal display (LCD) and digital light processing (DLP) (n=40). After the printed crown was scanned again from inside and outside, the prepared teeth were evaluated using a 3D program. To compare the root mean square (RMS) results among groups (α=0.05), the one-way analysis of variance and Tukey's test were used. Results: No statistically significant difference was found between the mean RMS values of the anterior and posterior teeth (p>0.05). However, as a result of comparing the internal, external, and tooth shapes, the DLP group showed significantly low errors in the inner and outer surfaces than LCD group (p<0.05). Conclusion: In terms of clinical acceptance standard of 100 ㎛, the fit of the anterior and posterior teeth fabricated using LCD and DLP was clinically acceptable.

• 한국식생활문화학회지
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• 제12권1호
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• pp.23-33
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• 1997

The aim of this study has been two fold - to analyze the degree of utilization of Korean menu items in family restaurants; and to evaluate consumer satisfaction with the quality of family restaurant food and food-related service. A self-completed questionnaire survey of 280 consumers having meals in 6 family restaurants in Korea was undertaken and detailed information was collected from each. Consumer satisfaction with the quality of food and food-related service in family restaurants was evaluated by consumer questionnaires. It was measured by assessing 24 variables. Statistical data analysis was using SAS package program for descriptive analysis, t-test and analysis of variance. Importance mean score of customers was 4.07 out of 5, with performance mean score of 3.19. The gap between importance and performance scores was 0.87. The Importance-Performance Analysis (IPA) technique was used for obtaining information of the degree of utilization of Korean menu items in family restaurants. By the results of the IPA technique, menu items with fair to poor performance and high importance to the customer were cooked meals, noodles, steamed and grilled dishes, Korean salads, kimchi, beverages, single-dish course, suggesting that customer seemed to be dissatisfied with the degree of utilization of Korean menu items in family restaurants.

• 한국의류학회지
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• 제28권2호
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• pp.332-343
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• 2004

This is a study on expression and the extent of using make-up according to the lifestyle of woman. The purpose of this study is to induce factors which decide the lifestyle of woman, group them, understand groups＇ demographic characteristic and study on make-up expression and the extent of using make-up according to the lifestyle of groups. This survey is conducted to 611 women and analyzed with SPSS package. The result of a study is as follows： 1. We classified them into 5 factors such as factors of make-up preference, arance-oriented, economy and information-oriented, daily make-up, and interest in make-up with the method of AIO analysis. Then I researched groups on the basis of the mean of those factors. As a result, it is classified as a make-up oriented group, a consciously daily make-up group, a unconcern of make-up group, and a reasonable make-up pursuit group. 2. The demographic characteristic according to the classified lifestyles showed the difference as a result of variance analysis of age, marital status, job, education, and monthly pay. 3. A result of variance analysis on the extent of satisfaction with their faces according to the lifestyle showed the difference of facial satisfaction with complexion, skin, eyes, nose and so on. 4. We analyzed a reason of make-up, a extent of make-up, image to express, the most concerning part for make-up, and the type of cosmetics which people use most in order to know the difference of make-up expression and the extent of using make-up. As a result, its variance showed the difference among groups.

• 한국가정과교육학회지
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• 제13권3호
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• pp.69-84
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• 2001

The purpose of the present study is to investigate the relationship between self-concept and clothing behavior of elementary school children. For this purpose. 301 third and sixth graders two schools in Daegu-city were sampled. The \`Test of Self-Concept\` and \`Questionnaire on the Clothing Behavior\` were administered purpose of this study. The collected data were analyzed by the SPSS/PC Windows programs according to the research issues. Means and standard deviations were calculated and a three-way analysis of variance was applied to analyze the effects of grades, sex(gender) and self-concept on the clothing behavior. The major results of this study were as follows: 1. It was found that the mean score of the clothing behavior was significantly different depending the level of self-concept (group). The mean scores of manageability. psychological dependency interest and conformity of the high self-concept. group were significantly higher than those of the low self-concept group. But. there was no significant difference between the high and low self-concept groups in the mean score of comformity. 2. There were statistically significant differences between the sex of children in the mean score of the clothing behavior. It was found that the mean score of manageability, psychological dependency and interest of the female students were significantly higher than those of the male students. However the mean score of the comfortability of male students was significantly higher than that of the female students. In the meantime there was no significant difference between the sex of students in the mean score of comformity. 3. There were statistically significant differences in the mean score of the clothing behavior according to the graders of children . It was found that the mean scores of manageability, psychological dependency, interest and comfortability of the third graders were significantly higher those that of the sixth graders. But, there was no significant difference depending the grades of students in the mean score of conformity. 4. There were statistically significant interaction effects between the sex and the grade of children on the mean score of interest and comfortability. It was found that the mean score of interest of male third graders was higher than that of male sixth graders. The mean score of comfortability of the female third graders higher than that of sixth graders.

• 한국정보과학회논문지:정보통신
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• 제35권6호
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• pp.474-481
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• 2008

스캐닝 웜은 자기 스스로 복제가 가능하며 네트워크를 통해서 짧은 시간 안에 아주 넓은 범위에 걸쳐 전파되므로 네트워크의 부하를 증가시켜 심각한 네트워크 혼잡현상을 일으킨다. 따라서 실시간으로 스캐닝 웜을 탐지하기 위해 많은 연구가 진행되고 있으나 대부분의 연구가 패킷 헤더 정보를 이용하는 방법에 중점을 두고 있으며, 이 방법은 네트워크의 모든 패킷을 검사해야 하므로 비효율적이며 탐지시간이 오래 걸린다는 단점이 있다. 따라서 본 논문에서는 네트워크 트래픽량, 트래픽량의 미분값, 트래픽량의 평균 미분값, 트래픽량의 평균 미분값과 평균 트래픽량의 곱에 대한 variance를 통해 스캐닝 웜을 탐지하는 기법을 제안한다. 실제 네트워크에서 측정한 정상 트래픽과 시뮬레이터로 생성한 웜 트래픽에 대해 성능을 분석한 결과, 기존의 탐지기법으로는 탐지되지 않는 코드레드와 슬래머를 제안한 탐지기법으로 탐지할 수 있었다. 또한 탐지속도를 측정한 결과 웜 발생초기에 모두 탐지가 되었는데, 슬래머는 발생 후 4초만에 탐지되었으며, 코드레드와 위티는 발생한지 11초만에 탐지되었다.

• 한국간호교육학회지
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• 제18권2호
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• pp.229-238
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• 2012

Purpose: The purpose of this study was to evaluate the theory of planned behavior (TPB) in the structural relationship of nursing students' performance related to nosocomial infection control (NIC). Method: Data was collected by using a questionnaire completed by 238 nursing students of three nursing colleges in Suwon, Sokcho. Results: The mean score of performance related to NIC was 3.86. The highest mean score of performance related to NIC was 4.18 (${\pm}0.91$) for 'hand washing' and the lowest mean score was 3.56 (${\pm}1.08$) for 'respiratory system'. In prediction of the intention of nursing students' on NIC, the attitude, the subjective norm, and the perceived behavior control(PBC) of TPB resulted in statistically significant influencing factors (p<0.050). These three variables explained 47.6% of the total variance of the intention of nursing students' on NIC. In predicting the performance related to NIC, the PBC resulted in the direct and main influencing factor of nursing students' performance related to NIC (p<0.010). Intention was not a significant determinant. These two variables explained 13.2% of total variance of the performance related to NIC. Conclusion: This study shows the TPB model's applicability in explaining performance related to NIC of nursing students and highlights the importance of PBC for strategies to enhance performance related to NIC in nursing students.

• 한국직업건강간호학회지
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• 제8권1호
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• pp.42-55
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• 1999

The purposes of this study were to understand health-promoting behavior of client visiting health-promoting center, to identify the major subscales affecting performance in health promoting behavior to facilitate nursing intervention for health promoting of this population and to test Pender's Health Promotion Model. The subjects for this study were 177 sampled among clients from health-promoting center in General Hospital at Teajon. Data was collected by self-reported questionnaires from February 11 to May 22, 1998. Analysis of the data was done by frequency, t-test, ANOVA, Pearson Correlation Coefficient, Stepwise multiple regrssion using SPSS-PC. The results of the study were summarized as follows : 1. The mean score of performance in the health-promoting behavior was 109.22 and range was 71 to 170. The subscale of the highest mean score was self-actualization(30.77) and the subscale of the lowest mean score was exercise(10.50). 2. The most important variable in the health promoting behavior was the perceived self-efficacy. The perceived self-efficacy explained 15.8% of the variance in health promoting behavior. The combination of perceived self-efficacy, perceived barriers, religion, perceived benefits, perceived symptom, and age explained 43.5% of the variance in health promoting behavior. 3. In the relationships between individual characteristics and experience and health promoting behavior, age, religion, the significant differences in the subscale of the health promoting behavior ; sex, educational state, previous occupation, monthly income, marrital state, perceived symptom, and visiting plan of health-promoting center. 4. The health promoting behavior was statistically significant correlated with perceived benefits, perceived barriers, affect related to action, and perceived self-efficacy.

• 응용통계연구
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• 제34권1호
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• pp.39-56
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• 2021

Markowitz (1952)의 분산투자 모형 발표 이후 포트폴리오 최적화에 대한 많은 연구가 이루어졌다. 마코위츠의 평균-분산 포트폴리오 최적화 모형은 수익 분포가 정규분포를 따른다는 가정하에서 성립한다. 그러나 실생활에서는 수익 분포가 정규분포를 따르지 않는 경우가 존재한다. 또한 분산은 이상치의 영향을 많이 받는 민감한 지표이다. 이런 분산의 단점을 보완할 수 있는 하방위험인 숏폴(Shortfall)을 위험 지표로 적용함으로써 수익 분포에 대해 최적화가 가능한 평균-숏폴 포트폴리오 모형이 제안되었다. 또한 Jorion (2003)과 Park(2019)은 포트폴리오의 위험도를 최소화하는 동시에 적은 수의 자산으로 구성(sparse)되고 안정적(stable)인 포트폴리오를 얻는 퍼터베이션 방법을 제안하였다. 본 논문에서는 평균-숏폴 포트폴리오 모형에 퍼터베이션 방법과 adaptive Lasso를 적용하여 사용되는 자산의 수가 적으면서 안정적이고 쉽게 적용 가능한 포트폴리오 모형을 제안한다. 그리고 실증 데이터 분석을 통하여 모형의 타당성을 입증한다.

• 한국군사과학기술학회지
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• 제13권6호
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• pp.1043-1050
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• 2010

This paper examined the probabilistic load analysis for the tailplane during pitching maneuvering in the conceptual aircraft design phase. The flight load analysis based on the probabilistic distribution of design variables are compared with the results of the deterministic analysis. Two forms of variable distribution are used in this paper. One is standard normal distribution, the other distribution is calculated from the results of short-period longitudinal equation of aircraft motion. The influence of the distribution parameter on the probabilistic load analysis was investigated and the significant design variables that have an impact on the mean and variance of probabilistic load were identified. The comparison indicates that probabilistic load analysis provides more reliable probabilistic load distribution for the structural design than the traditional deterministic analysis.

• 한국해안해양공학회지
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• 제19권2호
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• pp.151-161
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• 2007

동해안 검조소 조위자료를 이용하여 비조석 성분을 추출하고, 추출된 비조석 성분을 이용하여 통계적인 특성 분석을 수행하였다. 분석대상 검조소는 속초, 묵호, 후포, 포항, 울산, 울릉도이며, 분석기간을 1년부터 가용한 자료기간까지 증가시켜 가며 비조석 성분의 분산 및 왜곡도 계수의 통계정보(최대값, 최소값, 평균, 표준편차) 변차를 분석하였다. 또한, 분석기간에 따른 통계정보의 변화범위를 분석한 결과, ${\pm}5%$ 범위의 분산 신뢰구간을 확보하기 위하여 필요한 분석기간은 전체적으로 12년 이상 정도로 파악되었으며, ${\pm}0.1$ 범위의 왜곡도 계수 신뢰구간 확보에 필요한 분석기간은 울릉도의 6년 이상을 제외하고는 모두 12년 이상으로 파악되었다. 한편, 자기상관함수 및 스펙트럼 분석을 수행한 결과, 절대적인 변화량에 차이는 있으나 변화경향은 모든 지점이 매년 유사한 것으로 파악되었다.