• The Journal of the Convergence on Culture Technology
• /
• v.4 no.4
• /
• pp.181-186
• /
• 2018

The purpose of this study is to provide students with basic information about the stress of the national examination and the stress of the students who have difficulties in school life and the development of counseling and education program for satisfactory academic life. The survey of the 213 students of dental hygiene departments in Chungcheong, Gyungsang region was carried out. As a result of SPSS 3.0 analysis, the index of happiness Satisfaction was the highest points. Happiness index showed statistically significant difference in gender, personality, friendship, academic achievement, pocket money satisfaction, and health status. There was statistically significant difference between the major and the major in satisfaction, personality, friendship, motivation, and power status, and happiness index and major satisfaction were statistically significant.

• The Korean Journal of Applied Statistics
• /
• v.6 no.1
• /
• pp.125-143
• /
• 1993

The primary objective of the paper is to review the development of approximations of the null distribution of a scan statistic and to show how these approximations were improved. Let $X_1, \cdots, X_N$ be a sequence of independent uniform random variables on an interval (0, t]. A can statistic is defined to be the maximum number of observations in a subinterval of length t $\leq$ T, when we continuously (or discretely) move the subinterval from 0 to T. A scan statistic is used to test whether certain events occur in a cluster aganist a null hypothesis of the uniformity. It is difficult to calculate the exact null distribution of a scan statistic. Several authors have suggested approximations of the null distribution of a scan statistic since Naus(1966). We conceive that a scan statistic can be used for detecting a "hot region" is defined to be a region at which the frequencies of mutations are relatively high. A "hot region" may be regarded as a generalized version of a hot spot. We leave it for a further study the concrete formulation of deteciton a "hot region" in a mutational spectrum.uot; in a mutational spectrum.

• Korea Information Processing Society Review
• /
• v.11 no.4
• /
• pp.45-55
• /
• 2004

건설교통부에 의하면 2004년 5월 현재, 자동차등록대수가 3명당 1대로 급속히 증가하여 자동차가 현대인들의 필수품이 되어가고 있다고 한다(4). 또한, 자동차를 직접 운전할 가능성을 지닌 운전면허증 소지자는 2003년 말 경찰청 통계에 의하면 성인 3명에 2명꼴로 나타났다[4]. 이러한 통계치를 살펴보면 생활공간을 이동하는 도구로서의 자동차가 그 자체로 또 하나의 생활공간으로 자리를 잡아가고 있음을 알 수 있다. (중략)

• Proceedings of the Korea Multimedia Society Conference
• /
• 2004.05a
• /
• pp.267-270
• /
• 2004

본 논문에서는 다양한 크기를 갖는 얼굴 영상들을 대상으로 얼굴 영역을 추출하고 추출된 얼굴 영역을 기준으로 증명 사진의 규격에 맞게 영상을 정규화하는 방법을 제안한다. 얼굴 영역의 추출을 위해서 본 논문에서는 피부색 확장을 통하여 얼굴 후보 영역을 추출하고. 얼굴 기관의 위치 정보와 얼굴 모양에 대한 통계치를 사용하여 최종 얼굴 영역을 결정한다 추출된 얼굴 영역과 배경 영역의 크기에 대한 비례 관계는 증명사진에 대한 통계조사에 의해 산출된 규칙을 적용하여 정규화한다. 제안된 방법은 다양한 배경을 갖는 130개 영상을 대상으로 실험하여 타당성을 확인하였다.

• Pediatric Gastroenterology, Hepatology & Nutrition
• /
• v.12 no.1
• /
• pp.30-38
• /
• 2009

Purpose: To investigate the physical and biochemical parameters related with elevated serum alanine aminotransferase (ALT) levels in obese children. Methods: One hundred forty-two obese or overweight children who visited the out-patient clinics of Chungnam National University Hospital between January 2006 and August 2008 were enrolled. Physical measures and biochemical tests were performed in all patients. Liver sonography was performed in 43 patients. They were divided into the following 2 groups based on ALT levels: group I, normal ALT levels (n=65); and group II, elevated ALT levels (n=77). We compared the physical measures, biochemical results, and ultrasonographic findings of the livers in both groups. Other causes of elevated serum ALT levels were ruled out. Results: The male-to-female ratios were 1.6:1 in group I and 7.6:1 in group II. Among physical parameters, the waist circumference-to-height ratio and hip circumference-to-height ratio were significantly higher in group II (p=0.001 and 0.046, respectively). Among biochemical parameters, aspartate aminotransferase (AST), ${\gamma}$-glutamyltransferase (${\gamma}$-GT), and total cholesterol levels were significantly higher in group II (p<0.001, 0.001, and 0.001, respectively). The AST/ALT ratio was <1 (mean, 0.55) and statistically lower in group II. There was a positive correlation between the serum ALT level and ${\gamma}$-GT (p<0.001, r=0.750), and a positive correlation between the serum ALT level and the waist circumference-to-height ratio in group II (p<0.001, r=0.401). Conclusion: The results suggest that the waist circumference-to-height ratio and ${\gamma}$-GT may be associated with elevated alanine aminotransferase activity in obese children.

• The Safety technology
• /
• no.171
• /
• pp.6-10
• /
• 2012

• The korean journal of orthodontics
• /
• v.39 no.5
• /
• pp.300-309
• /
• 2009

Objective: The purpose of this study was to evaluate the correlation between menton deviation and dental compensation in facial asymmetry. Methods: Tooth axis and distance of first molar and canine to the reference plane were investigated by cone-beam computerized tomography. The subjects consisted of 50 patients with asymmetric mandibles (male 21, female 29, mean age 24.3 years). Control groups were also assessed (male 11, female 9, mean age 25.6 years). Nine measurements (5 linear measurements and 4 angular measurements) were measured in order to evaluate the correlation between menton deviation and the linear and angular difference of first molar and canine in the deviated and none-deviated sides using the defined MPR images. The differences between deviated and non-deviated side, according to menton deviation, were statistically analyzed using stepwise multiple regression analysis. Results: From the result, Menton deviation was negatively correlated with mandibular first molar's angular measurement (${\Delta\angle}LM6$-Mn plane (dev.-ndev.)) and positively with maxillary fist molar's angular measurement (${\Delta\angle}UM6$-FH plane (dev.-ndev.)) (p < 0.01). Two angular measurements (${\Delta\angle}LM6$-Mn plane (dev.-ndev.), ${\Delta\angle}UM6$-FH plane (dev.-ndev.)) explained the variability in menton deviation with a significant $r^2$ value of 0.589. Conclusions: This study suggests that the tooth axis of upper and lower first molars leans towards the deviated side of Menton when there is mandibular asymmetry with Menton deviation.

• The Journal of Korean Academy of Prosthodontics
• /
• v.57 no.3
• /
• pp.203-210
• /
• 2019

Purpose: The purpose of this study was to verify the effect of the abutment superimposition process on the final virtual model in the scanning process of single and 3-units bridge model using a dental model scanner. Materials and methods: A gypsum model for single and 3-unit bridges was manufactured for evaluating. And working casts with removable dies were made using Pindex system. A dental model scanner (3Shape E1 scanner) was used to obtain CAD reference model (CRM) and CAD test model (CTM). The CRM was scanned without removing after dividing the abutments in the working cast. Then, CTM was scanned with separated from the divided abutments and superimposed on the CRM (n=20). Finally, three-dimensional analysis software (Geomagic control X) was used to analyze the root mean square (RMS) and Mann-Whitney U test was used for statistical analysis (${\alpha}=.05$). Results: The RMS mean abutment for single full crown preparation was $10.93{\mu}m$ and the RMS average abutment for 3 unit bridge preparation was $6.9{\mu}m$. The RMS mean of the two groups showed statistically significant differences (P<.001). In addition, errors of positive and negative of two groups averaged $9.83{\mu}m$, $-6.79{\mu}m$ and 3-units bridge abutment $6.22{\mu}m$, $-3.3{\mu}m$, respectively. The mean values of the errors of positive and negative of two groups were all statistically significantly lower in 3-unit bridge abutments (P<.001). Conclusion: Although the number of abutments increased during the scan process of the working cast with removable dies, the error due to the superimposition of abutments did not increase. There was also a significantly higher error in single abutments, but within the range of clinically acceptable scan accuracy.

• The Korean Journal of Applied Statistics
• /
• v.14 no.1
• /
• pp.91-101
• /
• 2001

It has been shown that the multiple trees predictors are more accurate in reducing test set error than a single tree predictor. There are two ways of generating multiple trees. One is to generate modified training sets by resampling the original training set, and then construct trees. It is known that arcing algorithm is efficient. The other is to perturb randomly the working split at each node from a list of best splits, which is expected to generate reasonably good trees for the original training set. We propose a new combined multiple regression trees predictor which uses the latter multiple regression tree predictor as a predictor based on a modified training set at each stage of arcing. The efficiency of those prediction methods are compared by applying to high throughput screening of chemical compounds for biological effects.

• Journal of dental hygiene science
• /
• v.15 no.2
• /
• pp.166-171
• /
• 2015

This study was conducted to assess knowledge, attitude, and performance of dental hygiene students on the hand washing. We surveyed 288 students attending the department of dental hygiene at K Universities and H Universities in Gwangju during the period from September 5 to November 20, 2014. The obtained data were analysed using SPSS version 20.0. According to the general characteristics, the hand washing knowledge of the third year students was highest with 4.72. At the question on the change of awareness after the education of hand washing, the hand washing performance showed that 4.17 for 'yes' was higher than 4.03 for 'no'. There was negatively correlated between knowledge and attitude (r=-0.020, p>0.05). The performance was positively correlated with attitude (r=0.161, p<0.05). There is a need to develop a continuous education program for finding out the right way to hand washing, which is able to enhance knowledge, attitude, and performance on hand washing.