• 한국연소학회지
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• 제3권1호
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• pp.71-78
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• 1998

The flame stabilization and the combustion characteristics of diffusion flame formed in the wake of a cylindrical bluff body with fuel injection are studied. With the turbulence generator, the flame stability limits and ion currents were measured and analyzed. The results from this experimental study are summarized as follows. The region with highest average value of ion currents in the middle of flame is moved to the upstream side by the turbulent components of main stream. The flame mass with partially active reaction is moved fast for uniform flow and turbulence generator G3, but the flame mass with relatively slow reaction is moved slowly for turbulence generator G1. If the turbulence generator with strong turbulent component is installed, the turbulent time scale is increased with movement from main stream side to recirculation zone as well as the flame stability limits is deteriorated. Though the special dominant frequency is not appeared in the eddy which exists in flame, high frequency characteristics are appeared in uniform flow and turbulence generator G3, and low frequency characteristics are appeared in uniform flow, turbulence generator G3 and G1.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 추계 학술발표회
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• pp.842-853
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• 2008

In the construction of dam, the key factor which decides the type of dam is security of materials resource. Because of the large scale earth work, the ability to supply the materials is essential part about economical efficiency. The research is the case study about controlling the plan to secure the material resources in the design of Buhang multipurpose dam. In case of Buhang multipurpose dam, at that time of basic design, it was planned to use a rock fill material. From the detail investigation about the river bed accumulative layer widely spread on the submerged district on the basic design, the research is accomplished to replace rock material with gravel material. After the investigation of whole reserves of gravel material, estimation of conformity as dam construction material from analysis of grain size distribution, the case study of oversea construction, and the material property comparison between rock fill material and gravel fill material, it is verified th possibility of using the gravel fill. Thereafter, the analysis of dam stability using a gravel fill material is accomplished. Finally, A gravel fill material can be used as the main construction material of CFRD, therefore the efficiency of resource recycling in the submerged area is maximized, and the established plan is more advantageous to stability, constructibility, environmentibility than the case of using a rock fill.

• 교육시설 논문지
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• 제20권6호
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• pp.21-30
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• 2013

This study aimed to identify elementary school teachers' perceptions of various aspects of physical environments of a classroom. For the purpose, a survey questionnaire was administered to 982 classroom teachers(female 82.2%) working at 67 elementary schools(Seoul 55%) located in Seoul and Busan. According to the analyses of the survey data, 50.8% of the respondent teachers suggested 20-25 as an optimum class size. Also, 57% of the teachers were positive about the current size of a classroom($67.5m^2$), but evaluations of a classroom size were divided between the teachers who had more and less than 30 students in class. Furthermore, three factors, labelled as 'uniqueness', 'residential stability' and 'visually pleasing', were extracted from a factor analysis of the Semantic Differential Scale consisting of 24 adjectives evaluating a classroom environment. Teachers from Busan tended to rate higher in the uniqueness domain while female teachers scored higher in the domain of residential stability, respectively, compared to their counterparts. Overall, the teachers perceived their classrooms having no particular characteristics, but rated highly in terms of stability. In addition, it was found out that the teachers' requests for the improvement of a classroom environment were not so much as the increased size of a classroom as a reduced class size as well as educational facilities that are corresponding to a variety of instructional methods. In summary, this study confirmed that elementary school teachers' perceptions of a classroom environment varied according to such factors as sex, teaching career, grade of their concerned class, and class size.

• 한국콘텐츠학회논문지
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• 제21권3호
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• pp.653-663
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• 2021

본 연구는 중년여성을 대상으로 양가적 성차별주의와 포커싱적 태도가 자기개념에 미치는 영향을 살펴보았다. 자기개념 척도, 포커싱적 태도 척도, 양가적 성차별주의 척도를 사용하여 만35세이상 만55세이하 중년여성을 대상으로 온라인 커뮤니티를 통해 실시하였다. SPSS 21.0을 사용하여 분석한 결과 적대적 성차별주의와 온정적 성차별주의와 유의한 정적 상관이 있으며 양가적 성차별주의가 자기개념에 유의한 부적영향을 나타났다. 양가적 성차별주의의 적대적 성차별주의가 높을수록 중년여성의 자기개념의 모든 요인이 낮아지는 경향을 보였으며 포커싱적 태도는 자기개념에 유의한 정적영향이 나타났으나 하위요인별로 달랐다. 포커싱적 태도의 표현하기와 받아들이기, 여유갖기가 자기개념에 유의한 정적영향을, 알아차리기는 부적영향이 있는 것으로 나타났으며, 되새겨보기는 유의한 영향이 나타나지 않았다. 마지막으로 본 연구의 한계점에 대해 논의하였다.

• 지질공학
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• 제33권4호
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• pp.657-671
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• 2023

국내에 대규모 지진이 발생하고 그로인한 여파가 지속됨에 따라 내진설계에 대한 법령이 강조되어 국내의 경우 경주지진 이후 내진설계기준이 새롭게 개정되었다. 개정된 내진 설계기준에서는 방파제의 원호활동파괴에 대한 안정성 검토가 새롭게 추가되었다. 이에 본 연구에서는 내진보강공법이 반영된 연구대상지반에 대하여 원호활동 파괴에 대한 안정성 검토를 수행하였으며, 시간이력에 따른 하부지반의 지반 가속도와 구조물의 변위를 확인하고자 하였다. 원호활동 안정성 검토 결과, 안전율이 최소 0.5~최대 1.7 이상 증가하였다. 시간이력해석 결과, 얕은구간과 깊은구간에서 모두 보강전·후에 따른 상부구조물의 변위 값이 최대 290 mm~최소 12 mm까지 감소하였으며, 지반가속도의 경우 보강 후 최대 5.33 m/s~최소 0.31 m/s까지 감소하는 경향을 확인하였다.

• 한국소음진동공학회논문집
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• 제16권12호
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• pp.1231-1237
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• 2006

The vibration of a running railway vehicle can be classified on lateral, longitudinal and vertical motions. The important factor on the stability and ride quality of a railway vehicle is the lateral motion. The contact between wheel and rail with conicity influences strongly on the lateral motion. In this study, an experiment for the vibration of a running railway vehicle was performed using a of the scale model of a railway vehicle. Also, the effects on the car-body, bogie and wheelset were examined for the weight and the stiffness of the second suspension system. The experimental results showed that the lateral vibration increases as the wheel conicity and stiffness of the second suspension system increase. And the lateral vibration of the bogie increases as the mass ratio between car-body and bogie increases. Also, the lateral vibration of the wheel becomes high at low speed, while the wheel of 1/20 conicity makes severe vibration at high speed running.

• 대한간호학회지
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• 제38권3호
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• pp.410-419
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• 2008

Purpose: The purpose of this study was to develop a stress measurement scale for Korean nursing students. Methods: Sixty preliminary items were selected by classifying 229 basic items extracted via literature review and Q-sorting method. In order to verify the reliability and validity of the preliminary instrument, data were collected from 617 nursing students in 2 colleges of nursing in Korea. Results: As a result of the item analysis, 58 items were selected. They consisted of 2 types of stress which were college-based stress (38 items) and clinical-based stress (20 items). Ten factors in college-based stress and four factors in clinical-based stress were extracted by factor analysis, and each had a total variance of 63.01%, and 64.93%. Cronbach's Alpha of those 58 items were .937 in college-based stress and .922 in clinical-based stress, which was high. Conclusion: This paper is meaningful in a way that it has developed a tool capable of measuring stress for nursing students, which reflects the characteristics of our country. It is recommended for further study to re-verify the relevance and stability of this measurement.

• 여성건강간호학회지
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• 제11권2호
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• pp.156-162
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• 2005

Purpose: The study was done to identify the relationship of symptoms of stress, cancer prevention behavior, the quality of life in women, and the factors influencing the quality of life. Method: The subjects of this study were 210 married women. They were living in Gyeonggi Province and Busan Metropolitan City. Symptoms of stress were measured by the Park's Stress Scale. Cancer preventive behavior was measured by Suh's Korean scale, and Smith Kline Beecham Quality of life' Scale by Dunbar. Data was analyzed with the SPSS program by ANOVA, Pearson's correlation, and Multiple Regression Analysis. Result: The higher scores of physical stress correlated with lower practice scores of cancer prevention behavior. Psychological and physical stress revealed negative correlations among sub-items of the QOL such as competence, psychological well-being, stability, physical well-being and activity. Multiple regression analysis revealed that the predictor of quality of life in the women was stress. A combination of symptoms of stress and cancer prevention behaviors accounted for 35.3% of the variance in the quality of life in the women. Conclusion: The most important factor influencing the quality of life of women was stress. Thus the study's findings can be useful in directing a comprehensive nursing care plan to improve the QOL of women.

• 한국노년학
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• 제29권3호
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• pp.1141-1158
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• 2009

본 연구에서는 한국 문화 속의 노인들이 경험하는 행복 요인을 알아보고자 하였다. 이를 위해 연구 1에서는 서울과 지방에 거주하는 노인 105명으로부터 그들을 행복하게 하는 요인이 무엇인지 그리고 그 요인이 왜 그들의 행복요인이라고 생각하는지를 개방형 질문을 이용하여 알아보았다. 연구 2에서는 행복을 측정하는 양적 척도를 개발하기 위해서, 우선 연구 1에서 얻은 내용을 기초로 70개의 문항을 구성하였다. 이것을 서울과 지방에 거주하는 노인에게 설문을 실시하였고 최종 200명의 응답을 이용하여 요인분석을 실시하였다. 그 결과, 최종 8요인 33문항으로 요약되었다. 8개의 요인은 ①가족관계, ②종교, ③경제, ④건강, ⑤일과 직장, ⑥심리적 안정감, ⑦여가, ⑧복지 순으로 명명하였다. 또한 요인분석에서 얻어진 최종 33문항들을 삶의 만족도 척도와 정서 경험 빈도 척도, 그리고 자아 존중감 척도를 사용해 수렴타당도를 알아 본 결과 수용할만한 수준의 타당도와 신뢰도를 나타내었다. 본 연구의 의의와 제한점, 그리고 후속연구에 대한 제언에 대해 논의하였다.

• 디지털융복합연구
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• 제16권5호
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• pp.361-372
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• 2018

본 연구의 목적은 중년여성의 노화 도구를 개발하는 것으로 연구대상자는 대도시 중년여성 385명을 대상으로 수집하였고, 개발과정은 예비문항 개발, 내용 타당도와 신뢰성 검증, 최종 문항의 요인분석 및 신뢰도와 타탕도를 검증하였다. 요인분석 결과 본 도구는 9개의 요인으로 구성되었고, '자기성취감', '신체변화적응', '심리변화적응', '대인관계', '갱년기증상적응', '경제적 안정', '신체건강유지', '사회적 지지', '사회변화적응'으로 명명되었다. 본 연구에서 개발한 도구는 전체 설명변량이 64.03%로 충분하였으며, 전체 신뢰도도 Cronbach' ${\alpha}$값 .90으로 높았고, 우울과의 상관관계 분석에서는 부적 상관관계(r=-.69, p<.001)가 있는 것으로 나타나 동시타당도가 검증되었다. 본 도구는 높은 타당성과 신뢰도를 가지는 것으로 확인되어 중년여성의 성공적 노화를 측정하기 위한 도구로 유용할 것이다. 본 연구에서 개발한 도구는 반복 연구를 통해 추후 중년여성의 성공적 노화를 지지하기 위한 프로그램 개발의 기초자료를 마련하는데 기여할 것으로 사료된다.