• Journal of Korean Biological Nursing Science
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• 제21권3호
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• pp.217-223
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• 2019

Purpose: Caffeine is the most widely consumed psychostimulant of the methylxanthine class. Among adolescents, high-dose of caffeine consumption has increased rapidly over the last few decades due to the introduction of energy drinks. However, little is known about the time-dependent effect of high doses of caffeine consumption in adolescents. The present study aims to examine the short- and long-term influence of high-dose caffeine on behavior of adolescence. Methods: The animals were divided into three groups: a "vehicle" group, which was injected with 1 ml of phosphate-buffered saline for 14 days; a "Day 1" group, which was injected with caffeine (30 mg/kg), 2 h before the behavioral tests; and a "Day 14" group, which was infused with caffeine for 14 days. An open-field test, a Y-maze test, and a passive avoidance test were conducted to assess the rats'activity levels, anxiety, and cognitive function. Results: High-dose caffeine had similar effects in short-and long-term treatment groups. It increased the level of locomotor activity and anxiety-like behavior, as evidenced by the increase in the number of movements and incidences of rearing and grooming in the caffeine-treated groups. No significant differences were observed between the groups in the Y-maze test. However, in the passive avoidance test, the escape latency in the caffeine-treated group was decreased significantly, indicating impaired memory acquisition. Conclusion: These results indicate that high-dose caffeine in adolescents may increase locomotor activity and anxiety-like behavior and impair learning and memory, irrespective of the duration of administration. The findings will be valuable for both evidence-based education and clinical practice.

• 한국건축시공학회지
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• 제21권4호
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• pp.377-386
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• 2021

본 연구는 지난 2019년 4월에 대한건축학회 기술표준(AIK-S-001-2019)으로 제정된 복합열화 및 구조체 거동이 동시에 작용하는 환경에서의 방수층 성능 시험방법에 있어 일부 표준 내용 중 현장 시공성 반영 부족 문제와 표준 시공 방법으로서 오류 부분 등이 지적되면서 이를 보완해야 한다는 관련 업계, 시공사, 발주자(건설사) 등에서 의견이 제안되었다. 이에 본 연구를 통하여 시험 항목인 구조물 거동대응성능 시험방법에 있어 현장 시공성, 시험 결과의 정량화, 기타 개선 사항 등을 고찰하였다. 고찰된 내용을 이용하여 표준(안)으로 제정 중인 (가칭)점착형 복합 방수시트에 포함되어 진행하고 있는 구조물거동대응성능 시험방법에 표준 규격으로서 활용 가능성과 현장 시공성 반영 문제 등의 개선 내용을 검토하였다. 또한, 검토된 내용을 반영하여 1차와 2차 성능평가를 실시하여 그 결과를 도출하였다. 이에 본 연구를 통하여 도출된 개선(안) 및 성능평가 결과를 토대로 (가칭) 점착형 복합방수시트 제정(안)의 기초 자료로 활용하고자 한다.

• 대한간호학회지
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• 제51권4호
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• pp.478-488
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• 2021

Purpose: This study aimed to develop and examine the effects of a prenatal program on environmental health behavior using cartoon comics among Korean pregnant women. Methods: This study used a non-equivalent control group pre-test/post-test design. The program used cartoon comics to explore environmental health behaviors during pregnancy. The program consisted of the following four components: environmental toxicants during pregnancy, avoiding particulate matter during pregnancy, environmental toxicants during baby care, and making a healthy environment for children. In total, 35 pregnant women participated in the study: 18 in the experimental group and 17 in the control group. Data collection and program adaptation were conducted between November 3, 2020 and January 19, 2021. The effect of the prenatal education program was evaluated by t-test and repeated measures ANOVA. Results: Learning experience (t = - 2.35, p = .025), feasibility (t = - 2.46, p = .019), satisfaction (t = - 2.23, p = .032) were higher in the experimental group than in the control group in the first post-test. Feasibility (t = - 2.40, p = .022) was higher in the experimental group than in the control group in the second post-test. Repeated-measures ANOVA showed significant interactions between time and group in environmental susceptibility (F = 9.31, p < .001), self-efficacy (F = 3.60, p = .033), and community behavior (F = 5.41, p = .007). Conclusion: This study demonstrates the need for a prenatal education program to promote environmental health perceptions and behavior during pregnancy. We suggest a prenatal class adopting the creative cartoon comics to promote the maternal environmental health behaviors.

• 대한토목학회논문집
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• 제43권2호
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• pp.157-164
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• 2023

본 연구에서는 진동대 실험을 통하여 지진하중으로 인한 팔레트 랙의 손상 및 파괴 거동을 분석하고자 하였다. 팔레트 랙은 일반적인 적재설비의 한 종류로써 기둥, 보, 그리고 브레이스로 구성되어 지진하중에 저항한다. 팔레트 랙의 지진하중으로 인한 안전성을 분석하기 위하여, 실제 물류저장 시설에서 사용되고 있는 팔레트 랙을 대상으로 지진하중을 증가시켜가면서 하중으로 인한 팔레트 랙의 거동을 분석하기 위한 진동대 실험을 진행하였다. 진동대 실험 결과, 팔레트 랙은 비틀림이 발생하면서, 1층과 2층에 위치한 일부 부재의 연결부가 손상되고, 그로 인하여 적재설비가 파괴되는 것이 확인되었다.

• 한국터널지하공간학회 논문집
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• 제12권2호
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• pp.117-127
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• 2010

대부분의 지하구조물들은 불포화 지반에 건설되어있는 경우가 많으므로, 본 논문에서는 불포화토의 겉보기 점착력이 지반 굴착시 거동에 미치는 영향에 관하여 연구하였다. 이를 위해 압력판 추출시험, 불포화 삼축압축시험, Trap-door 시험을 수행하여 다양한 범위의 겉보기 점착력에서 지반의 거동이 어떻게 변화하는지 관찰하였다. 그 결과 완전 포화와 완전 건조 상태일 때는 지반이 거의 같은 거동을 보이고, 불포화 상태일 때는 함수비의 증가에 따라 그 거동이 매우 달라짐을 알 수 있었다. 이를 통해 겉보기 점착력이 지하 구조물 굴착 시 매우 중요한 역할을 한다는 것을 알 수 있었다.

• 한국지진공학회논문집
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• 제8권5호통권39호
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• pp.1-14
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• 2004

본 연구는 우리나라에서 저층 주거용 건물로 널리 사용되고 있는 2층 규모의 비보강조적조 의 1/3 축소 모델에 대한 진동대 실험을 수행한 것이다. 본 연구의 주목적은 내진설계가 이루어지지 않은 조적조 건물의 내진거동을 살펴보고, 실험적 자료를 확보하는데 있다. 실험대상구조물은 횡방향으로는 대칭이지만 종방향으로는 약간 비대칭이고, 비교적 강한 다이어프램을 나타내는 콘크리트 슬래브로 되어있다. 실험체에 대한 모의 지진하중은 가속도를 점차 증가시켜가면서 종방향으로 가력하였다. 실험에서 얻은 구조물의 동적 응답자료는 진동대의 입력지진과 연관지어서 분석하였다. 더욱이 성능기초설계를 위한 성능수준을 제시하였다. 실험결과 1층에서의 전단파괴가 지배적이고 상부층은 강체거동을 보여주었다. 또한 균열 발생후에도 상당한 강도와 변형능력을 보유하고 있는 것으로 나타났다.

• 한국구조물진단유지관리공학회 논문집
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• 제12권2호
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• pp.67-74
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• 2008

본 연구에서는 탄소섬유접착보강공법의 박리와 연관한 부착특성에 대하여 검토하였다. 그 결과를 요약하면, 온도변화에 따른 변형 특성에서는 바탕 콘크리트의 강도에 관계없이 온도 변화에 따라서 각 재료들의 변형 폭도 커지는 것을 알 수 있었다. 초음파 전파 속도도 온도변화에 따라 작아지는 것으로 나타나 계면에서 박리가 발생하였음을 알 수 있었다. 부착강도는 온도 변화가 클수록 부착강도의 값은 작아지는 것으로 나타났는데, 파괴형태는 계면파괴와 모재파괴 형태로 나타났다. 건습 변화에 따라서는 4사이클까지 각 재료의 변형 및 초음파 전파 속도에서 큰 변화를 나타내지 않아 건습 자체의 반복에는 큰 영향이 없는 것으로 판단된다. 단, 부착강도는 40%정도 저하하는 것으로 나타났지만 비교적 양호한 강도를 나타내었다. 동결융해 시험결과는 온도변화 요인과 유사한 경향으로서 동결융해 작용을 받을 경우 4사이클 이내에 박리가 일어날 수 있는 것으로 분석되었다.

• 대한간호학회지
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• 제28권4호
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• pp.931-940
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• 1998

This study was done to describe health behavior and determine affecting factors in Korean adults, based on the Health Behavior Assessment tool. The subjects were sample of 298 adults from five cities. The instrument for this study were Health Behavior Assessment tool (30 items, 4 scale). Frequency, percentage, t-test, ANOVA, cluster analysis with SPSS program were used to analyze the data. The results of the study are as follows ; 1) The average item score for health behavior was 2.56, the highest score on the subscale was limitation of liking(M=3.16), followed by stress management (M=2.98), nutrition(M=2.82), energy conservation (M=2.67). 2) A significant difference between age, sex, perception of health, and health behavior were found. 3) Pattern of health behavior among Korean adults focused on stress management in order to obtain emotional stability, and balance and harmony in dietary life, and energy conservation. Patterns of health behavior in Korean adults is unique in each individual. Therefore nursing intervention skill for health promotion have to be developed based on the health behavior in each individual.

• 대한간호학회지
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• 제41권2호
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• pp.236-244
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• 2011

Purpose: In this study the impact of pro-environmental behavior, well-being oriented behavior, and use of cloth menstrual pads on dysmenorrhea in Korean female adults was examined according to the theory of reasoned action. Methods: A cross-sectional study was conducted with 195 Korean female adults. Data were collected from June to August, 2010 using self-report questionnaires. Data were analyzed using t-test, one-way ANOVA, Pearson correlation coefficients, multiple regression, and logit regression with STATA 10.0. Results: Pro-environmental behavior explained 48% of well-being oriented behavior. Well-being oriented behavior explained 10% of cloth pad use. Use of cloth pad explained 4% of dysmenorrhea and 5% of menstrual pain. The path through well-being oriented behavior had a significant effect from pro-environmental behavior to cloth pad use. Conclusion: Use of cloth pad was significantly related with well-being oriented behavior, pro-environmental behavior, social influence, dysmenorrhea, and menstrual pain. The results of this study suggest that pro-environmental strategies can help health care providers diminish clients' menstrual symptoms. Nursing intervention can support pro-environmental behavioral strategies.

• 한국가정과교육학회지
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• 제14권1호
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• pp.1-13
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• 2002

The purpose of this study is to find out the level of purchasing behavior and related variables of Korean adolescents in Kangwon Province. and to suggest a direction of consumer education for rational purchase and of Home Economics Education. through noticing the influence of socio-demographic variables and socialization-related variables. To find out the results of this study, a survey was made using questionnaires with middle school students who live in Kang-won Province. and 472 Questionnaires were used as the analysis data. The methods of statistical analysis used for this study were Cronbach' ${\alpha}$. Frequency Distribution, Percentile. Mean. Standard Deviation. ANOVA, t-test. Duncan's Multiple Range Test, Multiple Regression Analysis. and also SPSS PC+ was used. The summaries of the results of this study were as follows. First. the level of the adolescents'purchasing behavior was the average 3.34 which is higher than the centered number 3, and the level of pre-Purchasing behavior(3.36) was higher than that of the post-purchasing behavior (3.27). Second. the adolescents' purchasing behavior showed the significant difference according to the mothers' educational level and family income. Third among the socialization-related variables. the group which had much communications with their parents and friends about purchase. the group which got much consumer education in school and their home. the group which can see much advertisements about purchase showed high level of purchasing behavior. Fourth. in the regression analysis. the consumer education in school. the communication with parents or friends were significant variables to the level of purchasing behavior. Looking into the subcategory. the communication with parents. the amount of pocket money. the father's occupation were significant variables to the level of pre-purchasing behavior, And the consumer education in school. the communication with parents or friends. the father's occupation were significant variables to the level of post-purchasing behavior.