• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 2003.11a
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• pp.348-354
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• 2003

An analysis of the dynamic behavior between disk and roller has been performed when the torque is transmitted to toroidal IVT (Infinitely Variable Transmission). The contact area, shape and pressure with elliptical shapes between disk and roller are computed as the transmission ratios are changed. This study will give the information of contact shapes between roller-input dist and roller-output disk which are working under the most severe condition. The computed results are expected to guide the design criteria for the enhanced endurance li(e. Furthermore, the investigation of contact behaviors is very crucial to develop the traction oil that the efficiency of IVT system is most dependent on.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.05a
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• pp.181-181
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• 2004

3 차원 형상측정기술(3-D Profile Measurement Method)은 가공품의 치수검사 및 형상측정 등의 공학분야뿐만 아니라 최근에는 의류산업 및 의학산업은 물론 오락산업의 가상현실 구현 등 여러 분야로 점차 사용이 확대되고 있다. 이러한 요구를 만족시킬 수 있는 광학을 바탕으로 한 비접촉 3 차원 형상측정방법(Non-contacting 3-D Profile Measuring Method)은 고속, 고정밀도 측정이 가능하기 때문에 활발히 연구되고 있다. 광학을 이용한 대표적인 3 차원 비접촉 측정방법의 하나인 영사식 무아레는 그림자식 무아레의 단점인 격자의 크기가 측정물체보다 커야 한다는 점과 측정물체와 격자사이의 거리 제한 문제를 해결하였으며, 위상이동법을 사용함으로서, 무아레 무늬 형태의 영향을 받지 않고 측정이 가능해졌다.(중략)

• Transactions of the Korean Society of Mechanical Engineers
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• v.16 no.6
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• pp.1030-1035
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• 1992

This paper presents a non-contact type displacement sensor designed based on optical triangulation method. The optical principles of the sensor are described in detail with aids of paraxial geometric optics. A prototype sensor is designed and fabricated by using modern optoelectronic hardware. Its measuring performances are evaluated and discussed through a series of calibration processes.

• Journal of Astronomy and Space Sciences
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• v.24 no.2
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• pp.99-110
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• 2007

A total of 824 observations (206 in ${\Delta}B$, 206 in ${\Delta}V$, 206 in ${\Delta}R$, 206 in ${\Delta}I$ for CC Com were made on 3 nights from March 3 to April 3 in 2002 using the 61cm telescope with 2K CCD camera of the Sobaeksan Optical Astronomy Observatory of KASI. From our observations 9 times of minimum light were newly determined. Combined analysis of our new BVRI light curves with the double-lined radial velocity curves of Pribulla et al. (2007) were made with the 2004 Wilson-Devinney(WD) binary model code to yield new physical parameters of the CC Com system. Small asymmetries in light curves were explained with the adoption of two hot spots on the cool secondary.

• Journal of Astronomy and Space Sciences
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• v.23 no.3
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• pp.177-188
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• 2006

A total of 920 observations (230 in ${\Delta}B$, 230 in ${\Delta}V$, 230 in ${\Delta}R$, 230 in ${\Delta}I$) for V523 Cas were made on 5 nights from January 6 to 24 in 2003 using the 61cm telescope with 2K CCD camera of the Sobaeksan Optical Astronomy Observatory of KASI. From our observations 9 times of minimum light were newly determined. Combined analysis of our new BVRI light curves with the double-lined radial velocity curves of the Rucinski et al.'s (2003) were made with the 2004 Wilson-Devinney (WD) binary model to yield new physical parameters of the V523 system. Small asymmetries in light curves were explained with the adoption of a cool spot on the hot primary and a hot spot on the cool secondary.

• Proceedings of the KAIS Fall Conference
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• 2009.12a
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• pp.331-335
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• 2009

본 연구는 AIDS에 대한 지식과 태도를 파악하여 AIDS에 관한 올바른 지식을 전달할 수 있고, AIDS 교육의 기초 자료를 확보하고 제공하여 남자고등학생들의 AIDS예방과 편견불식에 도움을 주고자 시도 되었다. 조사 대상자는 울산지역에 소재하는 D고등학교 전교생 961명을 조사 대상으로 하여 설문조사를 실시하고 분석하여 906명의 표본으로 다음과 같은 결론을 얻었다. 1. 조사대상자의 AIDS에 대한 지식은 총29점 중 19.7점의 지식도를 보였고, 일반적지식, 전파경로에 대한지식, 예방지식 중 일반적 지식이 가장 높았고 전파경로에 대한 지식이 가장 낮게 조사되었다. 2. 조사대상자의 AIDS에 대한 태도는 100점 환산하여 64.5점의 긍정을 보였고, 그 중 AIDS감염환자에 대한 편견이 있었다. 3. AIDS관련 지식은 AIDS관련 교육횟수, 교육의 도움정도, AIDS관련 정보획득방법, 흡연경험, 음란물접촉경험, 이 성교제경험, 성관계경험에 따라 통계적 유의한 차이를 보였다.(p<0.05) 4. AIDS에 대한 태도는 교육의 도움정도, AIDS관련 정보획득방법, 흡연경험, 음란물접촉경험, 이성교제경험에 따라 통계적 유의한 차 이를 보였다.(p<0.05) 5. AIDS관련 지식과 태도의 상관관계는 흡연경험과 이성교제경험이 있는 학생들에게서 지식의 수준이 낮을수록 긍정적 태도를 보였으며, 음란물접촉경험이 있는 학생들은 지식의 수준이 높을수록 긍정적 태도를 보였으며 통계적으로 유의하였다.(p<0.01) 6. AIDS에 대한 지식과 태도간의 관련성을 살펴보면 일반적 지식과는 0.158, 전파경로에 대한 지식과는 0.161, 예방에 관한 지식과는 0.204로 조사되었고 전체 지식과 태도간의 관련성은 0.198로 통계적으로 유의한 차이가 있었다.(p=.000) 7. 회귀분석 결과 HIV/AIDS에 대한 태도에 영향력이 가장 큰 것은 음주경험(-0.279), 이성 교제경험(0.259), 흡연경험(0.231), 음란물접촉경험(0.180), 예방지식(0.165), 전파경로지식(0.129), 교육도움(-0.125)순이었고 20.7%의 설명력을 가졌다. 고등학생들이 AIDS에 대한 올바른 지식과 감염환자에 대한 편견을 갖지 않도록 많은 교육 시간과 경험적인 학습의 AIDS관련 보건교육이 필요할 것이다.

• 한국노년학
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• v.38 no.3
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• pp.409-433
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• 2018

The purpose of this study is to examine the effect of contact with the elderly in a daily life on children's ageist attitude. Acknowledging the people's tendency to report in socially appropriate ways to the explicit attitude measurement, implicit measurement is introduced, and relation with the daily contact with elderly(DCE) is analyzed. The research question are as follows: 1) Are these two attitudes explained by different factors? 2) Can DCE alleviate both children's implicit and explicit ageist attitude? 3) How do the contact with grandparent and neighboring elderly affect the children's explicit and implicit ageist attitude? Data was collected from 503 fourth to sixth grade elementary school children. Child-Age Implict Association Test is used to measure implicit ageist attitude. Multinominal logistic analysis and ordered logistic analysis was applied. Followings are the main results: First, explicit and implicit ageist attitudes are found to be related with different predictors. Second, Elderly contact seems to lighten children's ageist attitude overall. Third, the effects of grandparental contact and the neighboring elderly contact on two different ageism were different. While the effect of elderly neighbor contact is limited to the expression of ageism, grandparental contact has a influence not only on the explicit but also on the implicit ageism, even though the effect on implicit attitude is limited in extent. Forth, not the quality of contact but the quantity of it was related to implicit ageist attitude. This result contradicts conventional idea of Intergroup Contact Theory. In the further research, the predictor of implicit ageist attitude need to be throughly examined.

• The Journal of Korean Academy of Prosthodontics
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• v.51 no.3
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• pp.199-207
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• 2013

Purpose: The importance of occlusal contacts of the natural dentition for durability of teeth, mandibular stabilization, and restorative dentistry is well known. The purpose of this study is to analyze the occlusal contact and guidance pattern of Koreans by evaluating the static occlusion on maximal intercuspal position and measuring dynamic occlusion during straight protrusion. Materials and methods: The occlusal contacts at maximal interincisal position and the occlusal guidance pattern during straight protrusion of 29 subjects were recorded with shimstock foil (Whaledent, Langenau, Germany), T-Scan III (Tekscan Inc., Boston, MA, USA), polyvinylsiloxane registration material (Genie Bite, Sultan Healthcare, Hackensack, NJ, USA) and compared. Occlusal registration procedures were repeated 3 times. The position was fixed to an upright position and the head position was fixed with the Frankfurt horizontal plane paralleling the horizontal plane. Fisher's Exact Test (R-General Public License, ver. 2.14.1) and Pearson's Test were used to assess the significance level of the differences between the experimental groups (${\alpha}=.05$). Results: When using shimstock foil, T-Scan III system, and polyvinylsiloxane registration material, most of the patients showed contact on anterior, premolar, and molar teeth during maximal intercuspal position. Approximately 51% of maximal intercuspal position showed anterior contact using shimstock foil. When examining the protrusive movement using shimstock foil and T-Scan III system, guidance pattern with the central incisor was the most common. Conclusion: During maximal intercuspal position, there were cases in which not all of the teeth showed occlusal contact. During mandibular protrusive movements, one or more maxillary central incisors frequently joined in straight protrusion and the posterior teeth were disoccluded. Therefore, the anterior teeth protect the posterior teeth, and vice versa. Thus, mutually protected occlusion should be applied when reconstructing occlusion.

• Journal of the Korean Society for Railway
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• v.19 no.1
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• pp.20-28
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• 2016

Curved squeal noise may result when railway vehicles run on curved tracks. Contact between the wheels and the rails causes a stick-slip phenomenon, which generates squeal noise. In order to identify the mechanism of the squeal noise systematically, a scaled test rig has been fabricated. Knowledge of the contact forces between the wheels and the rail rollers is essential for investigating the squeal noise characteristics; however, it is difficult to measure there contact force. In this study, contact forces have been calculated indirectly according to the modal behavior of the subframe that supports the rail roller and the responses at specific positions of that subframe. In order to verify the estimated contact forces, the displacements at the contact points between the wheels and rail rollers have been calculated from the estimated forces; the resulting values have been compared with the measured displacement values. The SPL at the specific location has been calculated using the estimated contact forces and this also has been compared with the SPL, measured in a semi-anechoic chamber. The comparisons in displacements and SPLs show good correlation.

• Korean Journal of Culture and Social Issue
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• v.11 no.3
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• pp.23-40
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• 2005

The present study tried to explore relations among rape myth, types of sex role, and exposure of sexually obscene material. The specific purposes of this study were investigate (a) if there are differences in the degree of acceptance of a rape myth according to gender, school grades and types of sex role in participants, (b) whether the acceptance of rape myth are different by the types of sex role, and (c) whether the acceptance of rape myth is related with exposure of sexually obscene material. A total of 723 students in middle, high school, and university completed a questionnaire survey. The results of this study are as follows. First, male students accepted rape myth more than female students. In the level of male students, there were significant differences in acceptance of rape myth among three school students(middle, high school, and university). Secondly, types of sex role were not related with the acceptance of rape myth. Thirdly, the correlation between their exposure of sexually obscene material and the acceptance of rape myth was significantly high in middle school male students. Finally, implications and limitations of this study were discussed.