• Imaging Science in Dentistry
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• 제52권1호
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• pp.83-91
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• 2022

Purpose: This study assessed the associations between chronological age, dental maturation (DM), cervical vertebrae maturation (CVM), and hand-wrist maturation (HWM) in individuals aged 9-19 years. In addition, this study aimed to derive practical methods to evaluate the skeletal age using DM, CVM, or HWM for orthodontic, medical, and forensic purposes and to compare which of these 3 developmental parameters is more accurate for estimating the age of individuals in a Turkish population. Materials and Methods: Panoramic, lateral cephalometric, and hand-wrist radiographs of 284 patients aged 9-19 years were used in this study. The DM, CVM, and HWM stages were determined. The Kolmogorov-Smirnov, kappa, Wilcoxon, Kruskal-Wallis, chi-square, and Spearman correlation tests and simple linear regression analysis were used for statistical analysis. The significance level was 0.05. Results: Statistically significant differences were found between chronological age and DM, chronological age and CVM, and chronological age and HWM in both sexes (P<0.05). DM did not show statistically significant differences according to sex (P>0.05), but CVM and HWM were statistically different between males and females (P<0.05). The DM-estimated age yielded more accurate values than the other methods. Conclusion: All correlations between skeletal and dental stages were statistically significant. Our results showed that there was no statistically significant difference between chronological age and DM-estimated age. Therefore, it can be concluded that DM stages have the potential to be used for legal purposes.

• Nuclear Engineering and Technology
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• 제54권5호
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• pp.1835-1844
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• 2022

Single-orifice plate is wildly utilized in the piping system of the nuclear power plant to throttle and depressurize the fluid of the pipeline. The cavitation induced by the single-orifice plate may cause some serious vibration of the pipeline. This study aims to find the optimal designs of the single-orifice plates that may have weak cavitation possibilities. For this purpose, a new single-orifice plate with a convergent-flat-divergent hole was modeled, a multi-objective optimization method was proposed to optimize the shape of a single-orifice plate, while computational fluid dynamics method was adopted to obtain the fluid physical quantities. The reciprocal cavitation number and the developmental integral were treated as cavitation indexes (e.g., objectives for the optimization algorithm). Two non-dominant designs ultimately achieved illustrated obvious reduction in the cavitation indexes at a Reynolds number Re = 1 ×10⁵ defined based on fluid velocity. Besides, the sensitivity analysis and temperature effects were also performed. The results indicated that the convergent angle of the single-orifice plate dominants the cavitation behavior globally. The optimal designs of single-orifice plates result in lower downstream jet areas and lower upstream pressure. For a constant Reynolds number, the higher temperature of liquid water, the easier it is to undergo cavitation. Whereas there is a diametric phenomenon for a constant fluid velocity. Moreover, the regression models were carried out to establish the mathematical relation between temperature and cavitation indexes.

• Child Health Nursing Research
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• 제30권2호
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• pp.97-107
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• 2024

Purpose: This study aimed to investigate the impact of family resilience on caregiver well-being across various age groups of children diagnosed with ADHD (attention-deficit/hyperactivity disorder) groups (0-5, 6-11, and 12-17 years). Methods: Utilizing secondary data from the 2022 US National Survey of Child Health, this cross-sectional study involved 2,752 children who were formally diagnosed with ADHD. Statistical analysis included descriptive analysis, Spearman's rank correlation, chi-square tests, and linear regression, conducted using SPSS version 27. Results: The study revealed a moderate positive correlation (r=.35, p<.001) between family resilience and caregiver well-being. Controlling for covariates, family resilience accounted for 25.2%, 21.1%, and 22.1% of caregiver well-being variance in age groups 0-5, 6-11, and 12-17 years, respectively. Additionally, factors like employment status, family structure, and caregiver age showed varying influences on caregiver well-being across these developmental stages. A consistent pattern emerged across these age groups: unemployment and non-traditional family structures were associated with negative impacts on caregiver well-being, whereas older caregiver age positively influenced well-being. Conclusion: This research underscores the importance of age-specific family resilience strategies to improve caregiver well-being and family interactions in ADHD contexts. Investigating these aspects through qualitative studies across various cultures could deepen our understanding of well-being and inform culturally sensitive interventions.

• 대한감각통합치료학회지
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• 제9권1호
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• pp.21-31
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• 2011

목적 : 학령전기 아동의 글씨 쓰기 명료도 및 속도와 지각-운동 기술의 상관관계를 확인하고, 글씨 쓰기에 가장 영향을 주는 요인을 알아보고자 하였다. 연구방법 : 덴버 발달 선별 검사를 통하여 정상 발달로 선별된 23명의 학령 전기 아동(평균 연령=68.61개월, SD=2.04)을 대상으로 글씨 쓰기 명료도 및 속도 측정을 위하여 한글 자모 쓰기 검사지를 사용하여 자음과 모음을 쓰도록 하였다. 시지각과 시각-운동 통합 수행 능력 측정을 위하여 시지각 발달 검사를 사용하였고, 소운동 협응 수행 능력 측정을 위하여 Grooved pegboard test를 사용하였다. 결과 : 글씨 쓰기 명료도와 전반적인 시지각, 비운동성 시지각, 시각-운동 통합, 우세손 소동작 협응의 상관관계는 없었으며, 글씨 쓰기의 속도는 전반적 시지각과 우세손 소동작 협응 항목에서 유의한 상관관계를 보였다. 회귀 분석 결과 글씨 쓰기 속도에 가장 큰 영향을 주는 요인은 전반적 시지각 항목이었다. 결론 : 만 5~6세 학령 전기 아동의 전반적 시지각 능력의 발달을 향상시키기 위한 중재를 제공하는 것이 글씨 쓰기의 속도 능력을 향상 시킬 수 있다는 것을 알 수 있다.

• 한국산학기술학회논문지
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• 제21권7호
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• pp.510-516
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• 2020

본 연구는 2008년부터 2017년까지의 질병관리본부의 퇴원손상심층조사 자료를 이용하여 입원 아동 중 낙상을 경험한 환자를 대상으로 유·아동·청소년 낙상의 특성과 낙상영향 요인을 규명하고자 하였다. 이를 위하여 입원 중 낙상(한국표준질병사인분류, W00-W19)으로 손상(한국표준질병사인분류, S00-S99)을 경험한 18세 이하 아동 환자 116건의 데이터를 수집·분석하였다. 수집된 자료는 SPSS 23을 이용하여 빈도분석, 교차분석, 다중회귀분석을 실시하였다. 연구결과, 입원 중 낙상을 경험한 아동은 남자가 여자 보다 많았고, 1세 이상 6세 이하의 연령에서 낙상이 가장 많이 발생하는 것으로 나타났다. 낙상을 경험한 아동의 질병유형으로는 호흡기 질환이 가장 많았고 낙상으로 인한 상해유형은 열린 상처나 타박상의 빈도가 가장 높았으며, 낙상 사고 원인으로는 침대와 관련된 낙상이 가장 많았다. 낙상 관련 요인분석 결과 성별을 제외한 연령(β=.318), 주진단명(β=.231), 손상(β=.169)의 순으로 낙상에 영향을 미치는 것으로 나타났다. 이와 같은 연구결과는 아동에 대한 낙상예방 교육이 연령, 질병 유형, 아동의 발달단계에 따른 특성과 연령대를 고려하여 실시되어야 함을 시사하는 결과라 할 수 있다. 또한 비교적 활동에 제약이 적은 경미한 질환의 아동이나 과다행동을 보이는 유아기 아동 등 질병의 유형과 연령별 아동 발달 단계특성을 고려한 낙상 사고 위험군에 대한 스크리닝 및 이와 관련한 섬세한 낙상예방 매뉴얼 개발에 힘써야 할 것이다. 마지막으로, 본 연구결과가 입원을 필요로 하는 아동 환자, 보호자, 그리고 관련 의료진에게 연령별 아동 발달단계의 특성에 따른 낙상예방 교육 및 매뉴얼 개발의 단초로 사용되기를 기대한다.

• 대한방사선기술학회지:방사선기술과학
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• 제32권1호
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• pp.79-86
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• 2009

전국 6개 도시의 종합건강검진센터에서 검진을 받은 건강한 성인 총 수진자 29, 531명을 대상으로 복부초음파검사로 진단된 간질환의 건강관련 요인을 분석한 결론은 다음과 같다. 초음파로 진단된 간질환 유병률은 43.1%로 나타났고, 성별로는 남성에서 23.3%, 여성에서 19.8%로 남성에게서 유의하게 높게 나타났으며(p < 0.001), BMI에 따른 유병률은 BMI $\geqq$ 25인 비만 군에서 지방간만이 44.3%로 높은 유병률로 나타났으며 이는 통계적으로 유의하게 나타났다(p < 0.001). 흡연에 따른 유병률은 흡연자군에서 지방간이 49.1%(남성 22.2%, 여성 26.9%)로 가장 높게 나타났고, 통계적으로 여성에서는 유의한 차이가 있는 것으로 나타났으며(p < 0.05), 남성은 유의한 차이가 없는 것으로 나타났다(p > 0.05). 고혈압에 따른 유병률은 정상군에서 지방간이 67.7%로 가장 높은 유병률로 나타났고, 당뇨에 따른 유병률은 당뇨 군에서 전체 간질환이 높게 나타났으며 지방간이 66.2%로 가장 높게 유병률로 나타났다(p < 0.001). 간질환 유병률에 대한 다중회귀분석 결과는 연령이 증가할수록 발병가능성이 높게 나타났고, 연령, 성별, 비만도, 당뇨는 유병률과 연관성이 있게 나타났으나(p < 0.05), 고혈압과 흡연에서는 유의성이 없는 것으로 나타났다(p > 0.05).

• 대한수의학회지
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• 제16권1호
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• pp.11-25
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• 1976

Studies on pathogenicities and developmental stages of Nosema apis (Zander, 1909) were carried out through artificial infection to Nosema free honey bees with various levels of spores isolated from local honey bee colony. The results obtained were summarized as follows: 1. The clinical symptoms were observed as dysentery, enteritis of mid-gut (enlargement and decoloration), crawling posture and shortening of the longevity of worker bees in the rearing honey bee colony inoculated with the spores. 2. Number of spores harvested from laboratory rearing honey bees were progresively increased to 4 weeks after inoculation. The regression equations and coefficients of correlations to various spore levels were as follows in each treatment colony. Colony 1. ($$1,000{\times}10^4spores/ml$$) $$y_{c1}=471{\times}10^{4}x+454{\times}10^4(r=0.65^*$$) Colony 2. ($$500{\times}10^4spores/ml$$) $$y_{c2}=340{\times}10^{4}x+207.8{\times}10^4(r=0.99^{**}$$) Colony 3. ($$100{\times}10^4spores/ml$$) $$y_{c3}=150{\times}10^{4}x+84.2{\times}10^4(r=0.99^{**}$$) Colony 4. ($$10{\times}10^4spores/ml$$) $$y_{c4}=13.8{\times}10^{4}x+13{\times}10^4(r=0.98^{**}$$) 3. Average longevity of worker bees artificially infected with Nosema apis was shortened as 21.7~43.8% compare to the control. (p<.05, p<.01) 4. The spores which were isolated from honey bee colony infected with Nosema disease were ovoid or spherical form, and measured, as a rule, from $4.7{\mu}m$ to $6.1{\mu}m$ (mean $5.3{\mu}m$) in length and from $2.4{\mu}m$ to $3.2{\mu}m$ (mean $2.9{\mu}m$) in width. 5. In the mid-gut of honey bees, the spore was progresively germinated and became trophozoite stage. The trophozoites were grown to meronts and their binary fission were begun. The divided two sporoblasts were developed to the spores which had elastic membrane. The new spores were shed in excreta of honey bees 10~15 day after inoculation at $25{\pm}2$ centigrade. 6. The ultrastructure of spore membrane consisted of three layers, such as, outer, middle and inner layer. The sporoplasm consisting lamellar structure occupied only anterior part of the spore and was often extended to posterior direction where definite vacuoles and a polar filament was able to detect.

• 한국사회복지학
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• 제57권2호
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• pp.375-403
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• 2005

본 연구는 퇴직소득심사제도가 고령자의 노동공급에 미치는 영향에 대한 이론적 논의와 실증분석결과를 미국중심으로 고찰하고, 2005년 1월 기준 퇴직연금 혹은 장해연금을 수급하고 있는 178,363명의 공무원에 대한 공무원연금관리공단의 원자료를 통해 공무원연금의 지급정지제도가 노동공급에 미치는 영향을 분석하였다. 분석결과 재취업한 공무원은 총 8,086명으로 전체 분석대상의 4.5%였으며, 지급정지된 공무원의 중위생존기간은 3.3년으로 나타났다. 또한 전액정지자의 중위재취업기간은 반액 정지자에 비해 20개월 가량 짧고, 실제 회귀분석에서도 100% 지급정지자는 50% 지급정지자에 비해 재퇴직발생확률이 유의하게 높은 것으로 나타났다. 특히 현행 제도는 유급소득활동만으로도 지급정지하기 때문에 이를 피하기 위해 재취업노력조차 하지 않거나, 일시금수급을 선택할 가능성도 있다. 따라서 이를 분석에 포함한다면 그 영향은 더 클 것으로 예측된다. 이에 본 연구에서는 공무원연금 지급정지제도의 발전적 방향으로서, 지급정지제도를 연령과 소득에 따라 차등적용하되, 지연연금제도와 병행하거나 부분연금제도의 도입을 제안한다. 또한 효과적인 정책마련을 위해서는 심도 있는 실증분석이 뒷받침되어야 하므로 소득, 고용형태 등을 포함한 재취업특성에 대한 자료구축이 시급하며, 공무원연금관리공단의 관리체계 또한 강화해야 한다.

• 한국유기농업학회지
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• 제28권2호
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• pp.251-261
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• 2020

친환경 벼 재배지역 위주로 피해가 점차 확대되는 먹노린재(Scotinophara lurida) 방제기술 개발을 위하여 발생생태 및 온도의존 발육모형을 산출하였다. 2019년도 먹노린재 월동 후 생존율 조사결과 총 224마리 중 167마리가 생존하여 생존율은 72.8%였다. 먹노린재 월동성충은 논에 6월 중하순부터 발생하고, 7월 상순에 산란하고, 8월 중하순에 1세대 성충이 발생한다. 온도의존 발육모형을 구하기 위하여 18, 21, 24, 27, 30℃ 14L:10D 조건의 항온기에서 온도별, 발육단계별 발육기간을 조사하였다. 18, 21, 24, 27, 30℃의 온도조건에서 알에서 성충이 될 때까지의 기간은 각각 119.8, 73.1, 53.5, 39.4, 82.0일로 27℃에서 가장 발육이 잘 되었다. Excell 프로그램을 이용하여 온도와 발육속도와의 관계를 2차 다항식으로 분석하여 회귀곡선을 얻었고 이를 근거로 발육단계별 발육영점온도와 유효적산온도를 산출하였다. 알에서 5령 약충까지 먹노린재 발육영점온도는 17.9℃, 유효적산온도는 380.2DD였다.

• 영재교육연구
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• 제5권2호
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• pp.139-156
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• 1995

The purpose of the study is to examine the effects of Gifted Education Isnstitute of Korea (GEIK) programs for gifted children especially in the areas of reasoning skills and creativity, thereby proving the effectiveness of the program. The subjects are 136 (103 boys and 33 girls) fourth, fifth, and sixth grade gifted children, who have participated in GEIK programs for more than six moths. They were stratified by the length of participation in GEIK programs. Ninety four children have participated for more than one year. Forty-two children have participated for less than one year. Both groups are rather homogeneous in IQ scores and school achievement levels at the time of enterance into GEIK programs. Both a Group Assessment of Logical Thinking (GAIT) and a Creativity test were used for the study on reasoning skills and creativity. GALT, developed by V. Roadranka, R. H. Yeany and M. J. Padilla in 1983, consists of 12 questions. It is classified into six subscales: conservation, proportional reasoning, controlling variables, provability reasoning, correlational reasoning, and combinatorial reasoning. The reliability of this test is .85. This test recommends to classify the stages of child development as follows according to the total test score. 0-4 point: Concrete Stage, 5-7 points: Transitional Stage, and 8 and above points: Formal stage. The Creativity Test was developed by Y. Lee and W. Chung (1971). It consists of four components: fluency, flexibility, originality, and openness. Only both fluency and openness were used in this study. In order to analyze data, T-Test, Intercorrelational Analyses, ANOVA, and Nultiple Regression were used. Followings are the results deduced from the above analoyses of the data. First, 43.48% of the subjects were on Concrete Stage, 36.78% were on the Transitional Stage, and 19.86% were on the Formal Stage in the developmental level classified by Piaget. Second, the students who have participated in GEIK programs more than one year acquired significantly higher score in GALT than the students who have participated in GEIK programs less than one year. Third, boys showed higher score in GALT than girls did. Fourth, there were statistically significant intercorrelations between six subscales of GALT. Fifth, the students who have participated in GEIK programs more than one year acquired significantly higher score in openness of creativity test than the students who have participated in GEIK programs less than one year. There were no significant differences in openness of creativity test between boys and girls. Sixth, the students who have participated in GEIK programs more than one year acquired significantly higher score in fluency of creativity test than the students who have participated in GEIK programs less than one year. Girls showed higher score in fluency of creativity test than boys did. Seventh, the students who acquired higher score in GALT showed higher score in both openness and fluency of creativity test. Followings are the conclusions deduced form the above results. First, the developmental level of reasoning skills of the fourth grade students participationg in GEIK programs is the same as that of 7th grade of normal Korean students and the same as those of 10th grade of U.S.A. and Philipoine students. Second, the GEIK programs are effective in improving reasoning skills. Third, the GEIK programs are effective in improving creativity. Fouth, reasoning skills and creativity can be improved by well planned programs. In conclusion, this study suggests that beyond reasoning skills and creativity, other areas such as areas in science skills, mathmatical skills, or verbal skills, etc., should be studied in the future.