• Journal of The Korean Association For Science Education
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• v.24 no.6
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• pp.1049-1062
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• 2004

In this study, various scientific viewpoints of 'motion of objects' were analyzed from the Aristoteles age to the Newton age. From the analysis, a questionnaire was developed which was including causes of motion, forms of motion, and preservation quantity of movement. The conceptions of pre-service science teachers were researched by the questionnaire developed in this study based on the science historical viewpoints. The subjects were twenty sophomore students of physic education major and thirty four of other science education major who majored common science education also in a college. Most of the pre-service teachers of physical education major had inertia and Newton's force conception related to the question situations of 'causes of motion' and 'forms of motion'. But a lot of the pre-service teachers of physic education major and other science education major had viewpoints of Descartes or Huygens related to the question situation of 'preservation quantity of movement'. Only few pre-service teachers regardless of major had Newton's viewpoint which represented in current Korean science curriculum for secondary school.

• 한국체육학회지인문사회과학편
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• v.55 no.5
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• pp.127-142
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• 2016

The purpose of this study was to clarify the casual effects among participants'curiosity, the perceived exertion and the exercise emotion on the exercise adherence behavior in marine leisure sports. The subjects for the study was 491 students who registered for the curriculum on marine leisure sports(SCUBA diving, Windsurfing, Yacht). They answered to 4 kinds of questionnaires. The descriptive analysis and the reliability analysis were accomplished through SPSS 18.0. The correlation analysis and the confirmatory factor analysis were conducted for verifying the validity of the research model with AMOS 18.0. The verification for the structure equation modeling was conducted to investigate the casual relationship among factors. The results was as follows. First, there was the causality between the participants'curiosity on the marine leisure sports and the exercise emotion, the emotion and the exercise adherence behavior, the curiosity and the behavior. Also, the exercise emotion was the partial mediating variable of the causality between the curiosity and the exercise adherence behavior. Seconds, when the exercise intensity was heavy, the rate of the positive emotion was low and the opposite was high. When the exercise intensity was heavy, the probability, predisposing and reinforcing were low. A strong will for doing exercise showed in case the exercise emotion was positive with high probability, predisposing and reinforcing. The exercise emotion was the partial mediating variable of the causality between the perceived exertion and the exercise adherence behavior.

• Journal of Korean Association for Spatial Structures
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• v.4 no.2 s.12
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• pp.81-88
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• 2004

The dynamic instability of snapping phenomena has been studied by many researchers. Few papers deal with dynamic buckling under loads with periodic characteristics, and the behavior under periodic excitations is expected to be different from behavior under STEP excitations. We investigate the fundamental mechanisms of the dynamic instability when the sinusoidally shaped arch structures are subjected to sinusoidally distributed excitations with pin-ends. The mechanisms of dynamic indirect snapping of shallow arches are especially investigated under not only STEP function excitations but also under sinusoidal harmonic excitations, applied i the up-and-down direction. The dynamic nonlinear responses are obtained by the numerical integration of the geometrically nonlinear equation of motion. And using this analyze characteristics of the dynamic instability through the running response spectrum by FFT(Fast Fourier Transform).

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.9
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• pp.179-185
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• 2013

In this paper, the RTA-ERP(Response Time Aligned-Evoked Relative Potential) was modelled to analyze the effect of motor activation pattern in response to visual sensory stimuli. Simon effect was analysed using the amplitude response of RTA-ERP and measured response time. The 'odd number' experiments, which identify an odd number mixed with same numbers, was performed with 15 healthy adult participants(9 males and 6 females, whose mean age of 31) for 7 minutes for each participant. Throughout experimentation, we observed that the proposed RTA-ERP can compensate the timing variation due to different neural processing procedures in the brain, and shows enhanced LRP(Lateralized Readiness Potential) and Pe(Error Related Positivity). Regarding to 'congruence' and 'incongruence' testing patterns, the amplitude of RTA-ERP and the response time for the 'congruence' are $0.03{\mu}V$ larger, and 43 ms faster than those for the 'incongruence', respectively. The amplitude characteristics of RTA-ERP, obtained by synchronizing the onset times with respect to response time, corresponds more likely to that of P300 in the ERP pattern (the characteristics of the Simon effect).

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 1997.04a
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• pp.136-143
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• 1997

본 연구에서는 철골구조물을 대상으로 지진격리(Base-Isolation)를 사용하였을 때의 진동감소 효과를 분석하기 위하여 지진하중에 대한 진동대 실험을 수행하였다. 실험 대상구조물은 $\frac{1}{4}$축소모형의 3층 철골구조물이며, 입력지진은 여러 계측기록과 UBC 설계스펙트럼으로부터 3가지 지반조건에 대하여 작성한 인공지진기록을 사용하였다. 축소 실험모형은 기초가 고정된 일반적인 철골구조물과 적층고무받침(Laminated Rubber Bearing) 형식의 지진격리장치(Base Isolator)를 사용한 구조물을 동시에 설치하여 그 지진응답을 비교 관찰하였다. 대부분의 하중하에서 지진격리장치가 사용된 철골구조물의 경우에 지진응답이 현저히 감소하는 것을 알 수 있으나, 장주기파의 성분이 강한 지반운동에 대해서는 오히려 지진응답이 증가하였다. 그러나 여러 지반조건에 대하여 UBC 시방서에서 규정한 설계하중에 대하여는 진동감소효과가 우수함을 보인다.

• Korean Security Journal
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• no.62
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• pp.205-221
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• 2020

The purpose of this study was to examine the effects of emotional labor on fatigue in regular private participation of sports workers, and to provide basic data to improve the welfare and working environment of private security guards, the core of private security industry. The survey response of 260 private security guards was used as the final analysis data, and the following conclusions were drawn through statistical tests of factor analysis, t-test, correlation analysis, and multiple regression analysis using the SPSS Windows 18.0 statistical program. First, the private security guards who regularly participate in sports showed lower sub-variability of fatigue, physical, exhaustion, and nervous system fatigue than private security guards who did not participate in sports. Second, it was found that fatigue was lower as the inner variables became higher, and that as the surface behavior became higher, the fatigue factor was lower. In conclusion, regular exercise participation can reduce emotional labor and improve fatigue of civil security personnel.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.8
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• pp.5198-5206
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• 2015

The purpose of this study was to examine the effect of social support from friend, senior junior, and coach on student-athletes' stress and deviant behavior. By using convenience sampling method of non-probability sampling, a total of 350 student-athletes from D and G city were selected. Of 217 copies of the questionnaire gathered, 35 were discarded owing to having excessive missing values. Thus, by analysing a total of 182 surveys with structural equation modeling through AMOS 20.0 statistics program, this study found the followings. First, social support has a negative influence on stress. Second, stress has a positive influence on deviant behavior. Third, social support has a negative influence on deviant behavior mediated by stress.

• Geophysics and Geophysical Exploration
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• v.15 no.2
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• pp.92-101
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• 2012

Three-dimensional finite-difference simulation in a small-scale half-sphere basin with planar free-surface is performed for an arbitrary shear-dislocation point source. A new scheme to deal with free-surface boundary condition is presented. Then basin parameters are examined to understand main characteristics on ground-motion response in the basin. To analyze the frequency content of ground motion in the basin, spectral amplitudes are compared with each other for four sites inside and outside the basin. Also particle motions for those sites are examined to find which kind of wave plays a dominant role in ground-motion response. The results show that seismic energy is concentrated on a marginal area of the basin far from the source. This focusing effect is mainly due to constructive interference of the direct Swave with basin-edge induced surface waves. Also, ground-motion amplification over the deepest part of the basin is relatively lower than that above shallow basin edge. In the small-scale basin with relatively simple bedrock interface, therefore, the ground-motion amplification may be more related to the source azimuth or direction of the incident waves into the basin rather than depth of it.

• Korean Journal of Health Education and Promotion
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• v.14 no.1
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• pp.47-62
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• 1997

본 연구는 한국 보건전문가들의 보건행동을 조사하고, 보건행동간의 상호 관련 요인과 보건행동에 영향을 미치는 인구학적 요인을 분석하는데 그 목적이 있다. 본 연구 대상으로는 한국보건협회 산하의 8개의 보건 관련 학회 중에서 보건교육과 가장 관련이 있는 한국보건교육학회(212명)와 한국보건 간호학회 (124명) 회원 336명이 선정되었다. 본 연구의 도구는 미국에서 이미 실시된 여러 보건행동 연구를 기초로 하여 focus group discussion, back-translation, 전문가들의 panel discussion, 그리고 pilot test(사전조사)를 통하여 한국인의 보건행동 연구를 위해 타당하게 개발되었다. 본 연구를 위하여 1995년 약 두달동안(11월, 12월), 3차에 걸친 우편설문조사를 실시하여 64.3%의 응답회수율을 보였고, 응답자들의 보건행동을 분석하기 위해서 factor analysis(요인분석)와 ANOVA (변량분석) 방법을 사용하였다. 본 연구의 결과는 다음과 같다. 1. 조사응답자의 분포는 남자가 33.8%, 여자가 66.2%였고, 응답자의 80.3%가 석사 이상의 학위를 소유하고 있었다. 응답자들의 전공분야는 다양하였고, 그들 중에서 36.3%가 간호학, 24.4%가 공중보건학을 전공하였다. 응답자 중 과반수 이상이 학교에 근무하였고, 서울에 거주하였으며, 응답자의 평균 직장 근무연수는 14년 이였다. 2. 응답자들의 보건행동에 대한 요인분석 적용의 적합성을 사전검증하기 위하여 Bartlett’s Test of Sphericity (630.37, p〈.00)를 실시하였다. 응답자들의 보건행동을 요인분석한 결과, 17개의 보건행동으로 구성된 네가지 보건행동요인들이 추출되었다. 응답자들의 네가지 보건행동요인들은 다음과 같다: (1) 규칙적인 식사 및 과일 섭취 (2) 음주 및 흡연 (3) 외식,간식 및 카페인 음료 섭취 (4) 운동 및 휴식 3. 응답자들의 인구학적 요인과 네가지 보건행동요인들과의 관계를 분석한 결과, 성별(F=69.59, df=1,203, p〈.05), 교육정도(F=3.48, df=3,199, p〈.05) 그리고 직장(F=4.04, df=3,201, p〈.05)에 따라 음주 및 흡연 행동에 커다란 차이를 보였다. 또한 응답자의 직장 근무연수(F=2.39, df=5,185, p〈.05)에 따라 운동 및 휴식 행동에 커다란 차이를 보였다.

• Journal of the Earthquake Engineering Society of Korea
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• v.13 no.3
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• pp.29-38
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• 2009

n the event of an earthquake, additional stresses can occur in the continuous welded rails (CWR) of High-speed railway (HSR) bridges due to relative displacements at expansion joints, and this stress can cause derailment. The amplification of ground motion occurs as a result of site effects, and this is pronounced at the site of a soft surface soil layer and of a rigid surface soil layer over a soft one. As a result, the amplified ground motion leads to an amplified seismic response in HSR bridges. A change in bridge pier height affects the seismic behavior of the bridge. A HSR bridge with gravel ballast tracks will show different dynamic behavior during an earthquake than one with concrete ballast tracks. The seismic responses of HSR bridges and their CWR are analyzed considering the derailment-inducing factors.