• 한국치위생학회지
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• 제1권2호
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• pp.213-225
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• 2001

Objectives: This study was taken to investigate factors related to dental caries in deciduous teeth of preschool children. Methods : this study was completed by oral examination on 623 kindergarten pupils and questionnaire on their mothers in Sangju city from April 1 to May 20, 2001. Study design is Cross-sectional Study. Results: The mean values for decayed teeth indexed(dt index), filled teeth index(ft index), and decayed and filled teeth index(dft index) was 2.46, 1.85, and 4.30 respectively. 2.05 for girl was significantly lower than 2.77 of boy in gender (p<0.01). As child ren got older, values were higher(0.7 and 2.84 of three years old, 1.6 and 4.01 of four, 2.42 and 5.02 of five) in ft and dft index(p<0.001). Also, Mother age was almost same, that is, 4.12 dft value for 30~34 years was smaller than 6.17 for above forties(p<0.001). 2.07 and 4.68 for mothers who graduated from high school were higher than 1.36 and 3.34 for university in the ft and dft index(p<0.05), that is, the more they had a high educational level, the lower they got a values. Value 2.76 for children who had non cariogenic food was lower than 5.11 for those who had cariogenic food in dft index(p<0.001). In dft index, 3.82 of children who have learned the education on oral health from mother frequently have lower than 45 of children who have never learned (p<0.05). The ft value of children who had a snack food with mother(1.29) was a smaller than children had it at out of home(1.97)(p<0.05). The variables related 10 dft index were children and mothers age, educational level, and kinds of snack food (p<0.05). Conclusion : This study reveals that younger girl, younger mother, higher educational level, and non cariogenic foods showed lower dft index.

• 전기학회논문지
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• 제56권4호
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• pp.790-794
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• 2007

This paper presents a new index mapping method for DFT (Discrete Fourier Transform) and its application to multidimensional DFT. Unlike conventional index mapping methods such as DIT (Decimation in Time) or DIF (Decimation in Frequency) algorithms, the proposed method is based on two levels of decomposition and it can be very efficiently used for implementing multidimensional DFT as well as 1-dimensional DFT. The proposed pipelined architecture for multidimensional DFT is very flexible so that it can lead to the best tradeoff between performance and hardware requirements. Also, it can be easily extended to higher dimensional DFTs since the number of CEs (Computational Elements) and DCs (Delay Commutators) increase only linearly with the dimension. Various implementation options based on different radices and different pipelining depths will be presented.

• 대한소아치과학회지
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• 제43권2호
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• pp.151-157
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• 2016

본 연구는 3-6세 어린이의 비만과 치아우식 사이의 관련성을 알아보고자 하였다. 익산시 소재의 어린이집과 유치원 아동 769명을 대상으로 우식경험유치지수(dft index)를 조사하고, 신장과 체중을 측정하여 체질량지수(body mass index)를 계산하였다. 표준성장도표의 체질량지수 백분위수를 이용하여 저체중, 정상, 비만위험, 비만의 4개 군으로 분류하였고, 저체중인 15명을 제외한 754명을 대상으로 분석하였다. 평균 dft index는 3.39였고, 남녀간의 유의한 차이는 없었다. 연령에 따라 dft index는 증가하였으며, 4세에서 5세에서 증가폭이 가장 컸다. 비만위험군과 비만군은 정상군보다 더 많은 우식경험률을 보였다. 그러나 3세 집단을 제외한 모든 연령군에서 정상, 비만위험, 비만 집단간의 통계적으로 유의한 차이를 보이지 않았다. 결론적으로 비만과 유치열의 우식경험에는 유의한 관련성이 없음을 알 수 있었다.

• 대한소아치과학회지
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• 제26권1호
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• pp.1-13
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• 1999

To study the caries patterns in primary dentition, 719 preschool children, 4-6 years old, were examined for their caries activity(salivary reductase activity) and caries experience of individual teeth. Teeth groups were made by cluster analysis using dft indexes of individual teeth as criteria. The six major teeth groups in the order of dft index from high to low were (1) lower primary molars, (2) upper primary molars, (3) upper central incisor, (4) upper lateral incisor, (5) canines, and (6) lower incisors. There were significant differences in dft index between teeth groups except upper lateral incisor and canines. Upper and lower primary molars showed the highest correlation in dft index, and the next couples were upper central incisors and upper lateral incisors, upper lateral incisor and canines, upper central incisor and canines, upper lateral incisor and upper primary molars, and canines and upper primary molars in descending order. Upper first primary molar showed the greatest differences in dft index between caries activity levels.

• 한국학교ㆍ지역보건교육학회지
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• 제12권2호
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• pp.69-80
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• 2011

Objectives: The purpose of this study was to explore relationship among dft index, diet and oral health behavior, parental awareness in oral health care and social status. Methods: This study was conducted from 8 January, 2009 to 11 June, 2009 in Asan city and Seosan city in Chungnam area. 4 kindergratens, 3 preschools and 1 children language academy were randomly selected to research on dft index, diet and oral health behavior. cross-sectional study conducted among 561 valid samples out of 641 samples collected using the survey was and then followed by oral examination. Throughout the research, numerus SPSS 15.0 statistical techniques, T-test and ANOVA and Spearman correlation coefficients were used for analysis. Results: Key results of the study are as follows: Age was found to be statistically very significant to dft index(p=0.036). Age of mother, especially between 30 to 49, was found to be statistically significant to dft index rate(p=0.001). Occupation of father was also found to be statistically significant to dft index(p=0.036). High parental awareness in oral health care led to low dft index rate, which also was found to be statistically significant(p=0.036). Conclusions: In conclusion, as Spearman correlation coefficient demonstrates, occupation of father affects most on long-term healthy oral behavior followed by parental awareness in oral health care and age of mother.

• 한국치위생학회지
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• 제10권1호
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• pp.215-229
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• 2010

Objectives : This study was to assess the children's mean number of decayed or filled primary teeth in relation to their mother's oral health behavior and then to increase children's oral health. Methods : The 346 children and their mothers were selected for this study. The children were 4 or 7 years old in the 4 dental clinics in Busan and Kyungnam, Korea. Data were collected by examination on children and self-administrated questionnaire on their mothers. The questionnaire was surveyed mother's oral health behaviour and children experienced dental caries or not and the number of decayed or filled they had were used as outcome variables. Results : 1. The mother's education level affected children's dft index significantly(p<0.05), In the case of tooth brushing method of children, the group with circle teeth wipes shows the low dft index(p<0.01). 2. On the other hand the group with snack as food eaten between meals has high dft index(p<0.001). 3. The group with mother's visiting to dentist within recent 1 year, experience in removing plaque or willing to attend the oral health education show low dft index(p<0.05). The important variables affecting to dft index are experience with oral health education, tooth brushing guidance, replacement of toothbrushes, the kind of food eaten between meals, recent experience of plaque removal and willing to participating in the oral health class. Conclusions : This study showed that the mother's oral health behavior and concern play an important role for the prevention of preschooler's dental caries. Dental health education would be focused on the mothers, expecially for the practice of preventive behavior by preschools themselves.

• 한국멀티미디어학회논문지
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• 제7권11호
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• pp.1505-1514
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• 2004

시퀀스 매칭은 시계열 데이터베이스로부터 질의 시퀀스와 변화의 추세가 유사한 데이터 시퀀스들을 검색하는 연산이다. 기존의 대부분의 연구에서는 효과적인 시퀀스 매칭을 위하여 다차원 인덱스를 사용하며, 데이터 시퀀스를 이산 푸리에 변환(Discrete Fourier Transform: DFT)한 후, 단순히 앞의 두 개 내지 세 개의 DFT 계수만을 구성 속성 (organizing attributes)으로 사용함으로써 고차원의 경우 발생하는 차원 저주(dimensionality curse) 문제를 해결한다. 본 논문에서는 기존의 단순한 기법이 가지는 성능 상의 문제점들을 지적하고, 이러한 문제점들을 해결하는 최적의 다차원 인덱스 구성 기법을 제안한다. 제안된 기법은 대상이 되는 시계열 데이터베이스의 특성을 사전에 분석함으로써 변별력이 뛰어난 요소들을 다차원 인덱스의 구성 속성으로 선정하며, 비용 모델(cost model)을 기반으로 한 시퀀스 매칭 비용의 추정을 통하여 다차원 인덱스에 참여하는 최적의 구성 속성의 수를 결정한다. 제안된 기법의 우수성을 규명하기 위하여 실험을 통한기존 기법과의 성능 비교를 수행하였다 실험 결과에 의하면, 제안된 기법은 기존의 기법에 비교하여 매우 큰 성능 개선 효과를 가지는 것으로 나타났다.

• 대한소아치과학회지
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• 제29권3호
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• pp.318-327
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• 2002

뇌성마비인의 구강위생상태에 관한 조사를 위하여 $3{\sim}48$세의 뇌성마비인 총264명(남153명, 여111명)과 비교군으로 비슷한 연령대의 비뇌성마비인 220명(남125명, 여95명)을 대상으로 구강검사를 시행하고, 우식경험유치율(dft rate), 우식경험유치지수(dft index), 우식경험영구치율(DMFT rate), 우식경험영구치지수(DMFT index), 치태지수(plaque index)를 산출하여 비뇌성마비인과 비교하였으며, 지적, 행동, 언어장애의 정도, 유형 및 이환 부위, 거주형태, 보호자의 직업에 따라 분류, 비교하여 다음과 같은 결과를 얻었다. 1. DMFT rate, DMFT index, dft index에서 뇌성마비군과 비뇌성마비군의 유의한 차이가 없었고, dft rate는 유의한 차이로 뇌성마비군이 높게 나타났다. 2. 뇌성마비군의 성별, 유형 및 이환 부위별 비교에서 우식경험도의 유의한 차이를 보이지 않았다. 3. DMFT rate와 DMFT index는 각각의 장애의 정도가 심할수록 유의성 있는 차이로 감소하였으며, 거주형태에서는 수용군이 비수용군에 비해 낮았고, 보호자 직업에서는 자영업이 낮게 나타났다. 4. 치태지수에서 뇌성마비군이 비뇌성마비군보다 유의성 있게 높았고, 거주형태에서는 비수용군이, 보호자 직업에서는 스스로 벌어서 생활하는 경우가 유의성 있는 차이를 보이며 높게 나타났다. 5. 치태지수에서 뇌성마비군의 성별, 유형 및 이환 부위, 각각의 장애의 정도에 대해서는 유의한 차이를 보이고 있지 않았다.

• 대한소아치과학회지
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• 제26권1호
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• pp.25-31
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• 1999

The purpose of study was to test the hypothesis that preschool children who experienced nursing caries have high dft index and caries activity in primary dentition. One thousand and seventy-five preschool children from 4 to 6 years old were examined for their caries experience and salivary invertase activity by Resazurin Disc Test. Nursing caries group was identified by the criteria of having more decayed and filled teeth among the upper incisors than among the upper molars. The prevalence of nursing caries was 15.8%. The dft index of nursing caries group was significantly higher than that of the other groups except the rampant caries group(P<0.01). The Resazurin Disc Test score of nursing caries group was significantly higher than that of the other groups(P<0.01) and there was no difference between nursing caries group and rampant caries group. Therefore, it is recommended that children who experienced nursing caries should be incorporated in the caries prevention program through the primary and mixed dentition.

• 치위생과학회지
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• 제14권3호
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• pp.371-378
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• 2014

본 연구는 비타민 또는 무기질 보충제 복용과 칼슘 및 인의 섭취에 따른 유치의 우식 발생과의 연관성을 파악하고자, 제4기 국민건강영양조사 자료에서 만 3~6세 아동 1,139명을 대상자로 선정하여 성별과 연령에 따른 우식경험 유치지수를 조사하여 비타민 또는 무기질 복용 여부와 칼슘과 인의 섭취 정도, 기타 사회경제적요인 및 구강관리 행동요인에 대한 통계분석을 수행하였다. 1. 연령이 증가할수록 우식경험 유치지수가 증가하였다. 2. 칼슘 섭취에 대해서는 성별에 따라 통계적으로 유의한 차이가 있었으며, 인 섭취는 3세 아동에서 성별에 따른 차이가 나타났다. 3. 만 4세 아동의 우식경험 유치지수는 비타민 및 무기질보충제를 복용하는 경우가 비복용자보다 1.206개 적었다. 이상의 단면연구 결과를 종합해 볼 때, 칼슘과 인, 비타민 및 무기질과 같은 영양섭취가 유치의 치아우식증에 영향을 줄 수 있는 주요한 요인임을 확인할 수는 없었으나. 비타민 및 무기질 보충제를 섭취하는 만 4세의 아동은 유의하게 낮은 우식경험 유치지수를 나타내었다.