• Journal of Oral Medicine and Pain
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• 제40권4호
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• pp.146-154
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• 2015

Purpose: The purpose of present study was to develop a method for assessing the chronological age of Korean adults based on the relationship between age and size of pulp cavity using dental radiographs of mandibular first molars. Methods: A total of 325 dental radiographs of Korean adults with known age and gender were selected for the study (199 males and 126 females) which were taken in the period between January 2009 and June 2014 at the Pusan National University Dental Hospital. The measurements were carried out on both orthopantomographs (OPGs) and intraoral periapical radiographs of mandibular first molar and the following ratios were calculated: pulp chamber floor height ratio (F/L), pulp chamber ceiling height ratio (R/L), and pulp chamber depth ratio (D/L). Results: The ratios of measurements on intraoral periapical images of mandible first molar generally produce more reliable data than the measurements on OPGs. The pulp chamber floor height ratio and pulp chamber thickness ratio showed significant correlation with age, whereas the pulp chamber ceiling height ratios showed weak correlation with age. It was found that the best correlations between the ratios and age were found for pulp chamber thickness ratios (r=-0.731 to -0.751). The multiple regression models were derived using 3 ratios that were significantly correlated with age. The determination coefficients ($R^2$) of the models ranged from 0.556 to 0.596. Conclusions: Our results indicate that the pulp chamber thickness and pulp chamber floor height in mandibular first molar are an age-dependent variable in adults which can be used to estimate age with reasonable accuracy. The higher image quality of dental radiographs will probably narrow the age estimation error and improve dental age estimation.

• 한국사회복지학
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• 제50권
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• pp.235-263
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• 2002

경로연금은 급여수준이 미미하고 제도규모도 크지 않지만, 공적연금과 공공부조로부터 배제된 저소득 노령계층에게 유일한 공적소득보장제도라는 점에서 중요한 제도적 위상과 역할을 갖고 있다. 특히 공적연금이 미성숙한 현단계에서 경로연금의 역할은 더욱 중요하다. 이러한 경로연금이 지금 중요한 정책기로에 서 있다. 국가정책 차원에서 경로연금 수급자를 매년 증가하여 책정해도 실제 수급자 규모는 이에 훨씬 미치지 못하고 있는 반면, 공적소득보장의 사각지대에 놓여진 노령계층의 경제적 어려움은 여전하다. 본 논문에서는 왜 노령소득보장체계상에 욕구와 자원의 부정합(mis-matching) 문제가 심각하게 발생하고 있는지에 대해 문제의식을 가지고, 보다 근본적으로 향후 인구고령화의 가속화, 노동시장의 유연화, 가족구조의 변화 등 경제사회적 여건의 질적 변화에 부합하는 노령소득보장체계의 재편방향을 모색하는 가운데 과연 경로연금이 어떠한 방향으로 발전하는 것이 바람직할 것인가를 모색해 보고자 하였다. 본 논문에서 노령소득보장체계가 갖추어야 할 원칙적인 기본방향을 크게 다음 세 가지로 정리하였다. 보편적 개별보장(universal and individual security)의 원칙; 지속가능성(sustainability)의 원칙; 형평성(equity)의 원칙. 이러한 대원칙하에서 본 논문은 경로연금제도의 발전방향을 크게 두 가지로 제안하였다. 하나는 현행 경과적이고 한시적인 제도의 틀을 유지하면서 제도의 충실화를 기하는 방향이고, 다른 하나는 경로연금제도를 공적연금과 공공부조의 사각지대에 놓여질 노령계층의 공적소득보장제도로서의 역할을 지속하는 방향이다. 이 때 경로연금의 발전방향을 결정짓는 중요한 변수는 공적연금의 역할이다. 만일, 공적연금이 현행 1소득자 1연금 체계로 계속 운영된다면 경로연금과 같은 무갹출연금적 성격의 제도는 계속 존속할 필요가 있다. 그러나 만일 공적연금이 1인 1연금의 틀을 갖춘 기초연금과 소득비례연금으로 재편되어 기초연금이 실질적으로 전노령계층에 대한 기초보장의 역할을 담당하게 된다면, 경로연금은 본래 제도의 목적대로 공적연금 성숙기까지 한시적으로 운영되는 현행 제도의 틀을 유지하는 것이 바람직할 것이다. 즉, 공적연금이 실질적인 전국민 기초보장의 역할을 할 수 있는가의 여부에 경로연금 발전방향의 향배가 달려 있다고 하겠다.

• 치과방사선
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• 제24권1호
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• pp.161-169
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• 1994

Hemangioma is a common tumor characterized by the proliferation of blood vessels. Some authorities believe that this lesion is not a true neoplasm, but rather a developmental anomaly or harmatoma. This lesion may be present at any age, but most cases are present at birth or arise at an early age, and the central hemangioma of the jaw is uncommon. The usual radiographic appearance of a hemangioma may have one or more of the following characteristics: a soap-bubble or honey-comb effect with multiloculated cyst like lesions having a fine fibrillar framework visible within them. The roots of teeth mayor may not show resorption. The authors have experienced a case of hemangioma, that occured in anterior mouth floor and Mn.symphysis area cured by means of surgical excision without dysfunction and facial disfigurement.

• 대한치과교정학회지
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• 제9권1호
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• pp.117-123
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• 1979

The aspects examined in the present study concerning the location and position of the lower third molar and the interrelationships of this molar, the gonial angle, and the second lower molar in subjects aged 8-24 are based on measurements made from 472 orthopantomograms. The following conclusion were drawn on the basis of the present study. 1. The gonial angle decreased with age, but slight enlarging occurred in the age group 20-21. 2. The angulation of the third molar in relation to the second molar did not correlate with the size of the gonial angle but decreased with developmental stage. 3. The mesial angle between the longitudinal axis of the second molar and the mandibular base line correlated significantly with the gonial angle. The above angle were smaller in Class II, Divison 2 and larger in Class III than in Class I and Class II, Division 1. 4. The rate of presence of lower third molar was 74.4%.

• 한국언어정보학회:학술대회논문집
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• 한국언어정보학회 2007년도 정기학술대회
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• pp.532-541
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• 2007

This paper investigates children's comprehension and production of demonstrative pronouns (DPs), 'zhege' (this) and 'nage' (that), in Mandarin Chinese. Subjects are children of ages three, four, five and six. Based on the results of the present experiment, children's developmental stages and the corresponding age grading are provided. Also, the present study incorporates a physical clue into the experiment. The result suggests that in the acquisition of deixis children rely highly on physical context to work out the meaning distinction. In addition, Piaget's egocentrism hypothesis and H. Clark's marking hypothesis are examined in the study. The result seems to support the egocentrism hypothesis. Subjects under the age of six do fail to shift the deictic center when they and the experimenter have a different perspective. As for the marking hypothesis, the study seems to challenge the hypothesis. The result shows that children actually performed better on the marked term 'zhege' than the unmarked member 'nage'.

• 아동학회지
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• 제12권2호
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• pp.5-17
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• 1991

The purpose of the present study was to investigate developmental trends and relationships between justice and friendship. Four different interviews were administered individually to fifty 4-to 8-year old children. In the Justice domain, the interviews consisted of open-ended questions devised to investigate the children's understanding of justice and a hypothetical story dilemma based on Damon(1977). In the friendship domain, the interviews consisted of open-ended questions based on Bigelow(1975; 1977) and Damon(1977) and a hypothetical story dillema based on Selman(1981). The developmental stage of each concept was determined through content analysis of the responses each child. Statistical analysis of obtained data was by percentage and Goodman-Kruskal's ${\gamma}$. * The results showed that children's conceptions of justice and of friendship developed in an age-related manner during early and middle childhood. While there was a significant correlation between children's conceptions of justice and friendship, this result was due to age-relatedness. The results of the present study support a domain specific approach to social cognition.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2004년도 추계 학술발표회 제16권2호
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• pp.493-496
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• 2004

The change of creep deformation mechanism due to the persistent change of stress conditions requires the constitutive relation for the analysis of long tenn behaviors considering age dependent material properties of concrete. In the present research, the process of time dependent behaviors in structure is divided into two stages; the non-mechanical deforming level which causes creep and shrinkage deformations, and the mechanical deforming level which causes mechanical deformations by the restraints of non-mechanical deformations due to internal or external factors. The incremental constitutive relation is derived by expanding the total stress-strain relation on the present time, with respect to the reference time using the Taylor series, and the modulus of elasticity in early ages of concrete was defined thru this process.

• 대한물리치료과학회지
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• 제1권2호
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• pp.243-249
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• 1994

The following analysis is conducted to the 108 employed physical therapist males 46, female 62 in Taegu and Kyung-Pook for the purpose of research on their present status from August in to September 17 in 1994. The percentage of the female polled is 57.4 % and the age of 21 to 30 is 79.7 %. The number of people who have worked over five years in general hospital is 8(7.4 %) and in local clinic 5(4.6 %). This report is researched in to the proportion of the males to females, age, career period, job classification, and salary range.

• 대한수의학회지
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• 제28권1호
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• pp.199-202
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• 1988

The present study was carried out to investigate the serum enzyme activities of racehorses. The enzymes investigated were aspartate and alanine aminotransferase (GOT, GPT), ${\gamma}$-glutamyl transpeptidase(${\gamma}$-GTP), Lactic dehydrogenase(LDH), creatine phosphokinase(CPK), and alkaline phosphatase(ALP). Animals used were 30 healthy racehorses(♀17, ♂13) average weighing 435kg and were from 2 to 8 years of age. LDH activity was progressively decreased with age and next in the order of GOT and CPK activities. GOT and ${\gamma}$-GPT activities were not changed with age but ALP activity tended to be decreased wish age. Activities of GOT, GPT, ${\gamma}$-GTP and ALP were higher in female than in male. There was no difference in CPK activity by sex, and no difference was found out among breeds.

• 아동학회지
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• 제9권1호
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• pp.19-32
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• 1988

The purpose of the present study was to investigate the view that animism is a result of immature concepts of life. Two studies were conducted for this purpose Study I examined developmental trends in animistic thinking and Study II examined children's knowledge of living things. The subjects of Study I were 10 males and 10 females at each level, 6, 8, 11 and 14 years of age and university students, for a total of 100 subjects. The subjects of Study II were 9 boys and 9 girls at each age level, 6, 7 and 8 years of age and university students, for a total of 78 subjects. According to the results of study I and study II, animistic thinking decreased up to middle childhood but increased at later childhood and adulthood. The conception of living things was acquired at 7 years of age. All things considered, there was no evidence that animism is a result of immature concepts of life.