• 대한치과교정학회지
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• 제11권2호
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• pp.125-134
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• 1981

To study the calcification of second molars in skeletal class II malocclusion, the author examined cephalograms, orthopantomograms, periapical films of 391 children from 7y 0m to 15y 11 m years old who had skeletal class II malocclusion, and observed the difference in the calcification stage between upper and lower second molars. The result s are as follows. 1. The mean ages of crown completion of upper and lower second molars are $8.7{\pm}1.75$, $8.8{\pm}1.13$ in boys, and $8.4{\pm}0.81$, $8.5{\pm}0.91$ in girls. 2. The mean ages of root completion of upper and lower second molars are $14.0{\pm}1.09,\;14.5{\pm}0.52$ in boys, and $13.7{\pm}1.15,\;13.8{\pm}1.18$ in girls. 3. The calcification stages of upper second molars are more advanced than those of lower second molars at $5\%$ level in both sexes.

• 치과방사선
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• 제13권1호
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• pp.145-150
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• 1983

The author studied clinically and radiologically 55 cases which had been diagnosed as odontoma in SNUDH. The obtained results were as follows: 1. In sex distribution, there was no prevalence in both sexes. And the incidence was the highest in the 2nd decade. (16 patients, 29%) 2. There were 42 cases of compound odontoma (76%) and 13 cases of complex odontoma (24%). In most cases, compound odontoma was located at the anterior portion (34 cases, 81%) and complex odontoma at the posterior portions (9 cases, 69%). 3. There was no apparent clinical symptom in compound odontoma (83%), but in complex odontoma, 80% of case show swelling. 4. The adjacent root resorption was not observed in any case. 5. Five cases radiographically diagnosed as cystic odontoma were not confirmed histopathologically.

• 한국동물학회지
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• 제17권1호
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• pp.17-22
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• 1974

Pentose phosphate shunt의 첫 작용때 나타나는 효소 glucose-6-phosphate dehydorgenase의 활성을 출생전 및 출생후 연령에 따라서 쥐(white rat)의 간세포를 암수 성별로 spectrophotometer를 써서 측정하였다. 이 활성이 16일 된 배에서 가장 높았고 (54 I.U.), 그때부터 출생후 13일 까지 조금씩 저하되지만 (17 I.U.), 다시 서서히 증가해서 19일에는 53 I.U.까지 높아졌다. 성별로 본 결과는 일반적으로 수컷보다 암컷에서 G-6-PD의 활성이 약간 높게 나타났다.

• 한국과학교육학회지
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• 제14권3호
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• pp.251-264
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• 1994

There are a considerable number of instruments in testing science process skills in Korea as well as America and Europe. However, it has been difficult to find the instruments encompass the wide range of scientific process skills. Most instruments developed and used in Korea were focused on a school level or a few components of scientific process skills. In this study, the researchers examined the whole body of scientific process and identified 10 component skills. Three items for each component process skills were developed and revised by two pilot tests. The final instruments showed moderate difficulty, discrimination index, reliability, and validity. The instrument was also tested the usability by finding differences of students' ability on science process skills by grade levels, sexes, and city size. The results showed that the instrument was proved to be useful to discriminates the differences.

• 대한치과교정학회지
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• 제13권1호
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• pp.7-14
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• 1983

Serial cephalometric roentgenorgams of 40 Korean children (25 males, 15 females) were employed to study the growth changes of the cranial bases. As a result of this study, the following conclusions can be made: 1. The mean size of the cranial bases in males was larger than the females, especially at the age of 13. 2. In both sexes, growth of the cranial bases was seen from 6 to 13 years of age and the growth of the posterior cranial base (S-Ba) was larger than the anterior cranial base (S-N). 3, Variation in the changes of the saddle angle (Ba-S-N) was exhibited with males showing a marked tendency toward a decrease in saddle angle size.

• 대한치과교정학회지
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• 제14권1호
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• pp.33-37
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• 1984

The prevalence of normal occlusion and malocclusion was assessed by Angle's Classification method for 8989 school students at 7-22 years in Seoul. The occurrence of malocclusion and the need-for orthodontic treatment was 61 per cent among them. Results indicated no significant differences between the sexes for the occlusal relationships of the mandible to the maxille. The prevalence of Class I, Class II, and Class III malocclusion in all malocclusion was shown to be Class I, 45.7 per cent; Class II, 7.6 per cent; and Class III, 7.9 per cent. Class II Division 1 was observed to occur four times frequently compared to Class II Division 2 in Class II malocclusions. Class III malocclusion was shown to occur more frequently compared that of Caucasians.

• 한국주거학회논문집
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• 제6권2호
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• pp.163-170
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• 1995

The purpose of this study is to investigate the college students' attitudes towerd caregiving and three-generation coresidencd of the future family living. In order to use its analysed results as a basic for the housing for the aged in Korea and to improve quality of their living environment. the number of 321 college students' in Taegu were surveyed and percent. crosstabulations were used to analysis the data. The result showed firstly that there was no difference in those college students' attitude toward caregiving to the old parents between sexes. and secondly that they had a potential sense of responsbilty of the eldst son of daughter for caragiving to the parents when considering the order of brothers and sisters. Thirdly the respondents of the female students were far more nagative for three-generation coresidence that that of the male students. Fourthly, there was no relation to the three-generation coresidenct regardless of the family form or the order of brothers and sisters. Fifthly, housing type based on the three-generation coresidence showed that they preferred an independent house with the size of 31-40 pyong. It was also shown that the room for the parents should be arranged in the best position.

• 대한치과의사협회지
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• 제22권8호통권183호
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• pp.699-703
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• 1984

The author surveyed on the maxillary median diastema of 1,522 (male: 805, female:717) 'H' and 'K' primary school children aged from 6 to 13. The results were as follows: 1. The prevalence of the maxillary median diastema was 11.6% in male, 7.5% in female and 9.7% in both sexes. 2. The prevalence of the maxillary median diastema showed the highest rate in 8 years old boys and girls, and it showed decreasing tendency according to increasing ago. 3. The prevalence of mesiodens was 0.4%, and boys had higher rate than girls. 4. Mean value of 'Frenum Distance' was 5.7mm in male, 5.5mm in female and mean value of 'Divergent Degree' was 2.0mm in male, 1.6mm in female.

• 한국응용곤충학회지
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• 제42권1호
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• pp.77-79
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• 2003

북미원산인 아까시나무 혹파리 해충중 하나인 아까시잎혹파리(신칭 : Obolodiplosis robiniae (Haldeman, 1987))를 우리나라 중부 지방에 분포함을 확인하여, 국내에서 최초로 기록하며 암컷과 수컷 성충의 형태적 특징과 아까시나무의 피해증상을 소개한다

• 치과방사선
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• 제5권1호
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• pp.22-25
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• 1975

The author has studied on the profiles on Korean young male and female by the cephalometric roentgenograms, the subjects were consisted of 104 persons with normal occlusion and the measurements were done on the soft and hard structures. The mean and standard deviations in the subjects were calculated and compared between male and female. The author has obtained the following results: 1. In the linear measurement, male was longer than female in most measuring points. 2. Compared with the angulation of soft tissue, there were no differences between both sexes. 3. In the skeletal patterns, there were some differences between male and female, but there was a similarity to the facial profile. 4. The individual variations on the cephalometric profiles on the subjects were recognized, especially, in the lower facial part.