• Journal of Korea Entertainment Industry Association
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• v.13 no.8
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• pp.345-356
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• 2019

This study investigated the influence of media sports contact motivation on direct sports participation in order to induce direct sports participation through media sports. In this regard, this study aimed to provide the basic data of media sports and sports participation by studying the effects of consumer's exercise commitment and exercise duration. From April 1, 2019 to April 31, 2019, a survey was conducted on 300 males and females in G and J provinces. To determine the purpose of the study, IBM's SPSS Ver. 21.0 and AMOS Ver. The analysis was performed using a statistical program of 21.0. The results of the study are as follows. First, media sport contact motivation was found to have an effect on exercise commitment. In addition, media sports contact motivation was found to have an effect on exercise persistence and sports participation. In addition, exercise commitment was found to have an effect on exercise duration, and exercise duration was found to affect sports participation. Second, in terms of media sports contact motivation and sports participation, exercise persistence had a mediating effect. In addition, it was found that exercise commitment had a mediating effect on the relationship between media sports contact motivation and exercise persistence, and exercise persistence had a mediating effect on the relationship between exercise commitment and sports participation. Third, media sports contact motivation did not have a direct effect on sports participation. Also, exercise immersion has no mediating effect in the relationship between media sports contact motivation and sports participation. However, in terms of media sports contact motivation and sports participation, exercise commitment and exercise persistence showed a double mediating effect.

• Journal of the Korean Institute of Gas
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• v.10 no.2 s.31
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• pp.27-32
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• 2006

In this paper, the contact stress and friction force between multi-balls and rolling friction contact surfaces of two cylinders have been presented using a finite element analysis. The multi-balls for a rolling friction motion may be contacted with a reciprocating mechanism of a parallel cylinder and a misaligned cylinder in a LPG filling unit. The FEM computed results indicate that SiC ceramic and SUS 304 balls show a high contact stress and friction force on the contact spot of rolling balls. But the PEEK balls show a low contact stress and friction loss due to a high flexibility of a PEEK polymer. In this study, we may recommend SiC and SUS 304 balls for high compressive loadings between a multi-ball and a cylinder contact mechanisms and PEEK balls for a low compressive force. And the misalignment between two cylinders should be restricted for a low contact stress and friction loss, especially.

• The Journal of Korean Academy of Prosthodontics
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• v.53 no.2
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• pp.128-137
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• 2015

Purpose: Most of the former studies about the occlusal contact patterns during the mandibular movement focused on foreigner. The purpose of this study is analyzing the occlusal contacts of young Koreans by using T-Scan system. Materials and methods: The sample size was 87 and the occlusal contacts of each right and left lateral movements were measured from the maximum intercuspation to the 3mm excursive position for three times respectively. All of the occlusal contacts were double checked through the thin metal foil. The results were categorized as two; 1) considering occlusal contact patterns on working side only, 2) considering occlusal contact patterns on working and nonworking sides. Results: The results showed that the nonworking side occlusal contacts play major roles in the lateral mandibular movement. In both cases of considering with and without the nonworking side occlusal contacts, the group function was the most prevalent. In the working side, the contacts were the most frequent in canine and the frequency of contacts was decreased as the distance was increased from canine to molar. In the nonworking side, the contacts were the most frequent in second molar. And the gender factor was statistically significant (${\alpha}$=.05), as females have more nonworking side occlusal contacts in this study. Conclusion: Among the three factors of anterior guidance, the group function was the most dominant factor. The analysis of 87 samples showed that canine contact was the most frequent in the working side and second molar contact was the most common in the nonworking side.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1992.11a
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• pp.50-56
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• 1992

공업재료의 표면은 수많은 돌기들로 구성되어 있으며 이러한 돌기들의 접촉으로 진실접촉이 이루어진다. 그러므로 마찰은 겉보기 접촉면적과는 무관하며 진실접촉면에서 일어난다. 표면의 한 돌기가 접촉면과 상대운동을 함으로 인하여 마찰열이 발생된다. 이러한 마찰에너지 발산의 결과로서 진실접촉면적 주위의 국부적인 표면 온도가 상승되며 따라서 표면의 평균온도가 상승된다. 이러한 표면온도를 결정하기 위한 이론적 및 실험적인 방법이 많이 제시되어왔다. 정적상태에서의 표면온도는 Block(1937)과 Jaeger(1942)에 의해 이론적으로 소개하였다. Jaeger는 열원의 위치와 상대적인 접촉운동 그리고 크기 및 경계조건 등의 특정한 조건 하에서 진실접촉점의 온도를 계산하였다. 이에 Bany와 Baber(1984)는 그들의 경계조건이 잘목 정의되었음을 지적하고 더욱 세분화된 경계조건으로 온도분포를 유도한 바 있다. Ling(1969)은 접촉점에서의 온도가 주변의 겉보기 접촉면적의 온도보다 훨씬 높다는 것을 수치해석으로 밝혀냈다. 본 연구는 고속정밀촬영기를 이용하여 진실접촉점에서 발생하는 Hot spot의 온도분포를 실험을 통하여 규명하고 그 결과를 Geoim과 Winer의 이론식에 적용하므로 식의 유용성을 검증하는데 그 목적이 있다.

• Journal of the KSME
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• v.28 no.6
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• pp.556-562
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• 1988

기계나 구조물의 수명을 결정하는 마멸은 물체간의 접촉으로 인한 것이고 마멸을 줄이기 위해 윤활이 발달되어 왔다. 여러 형태의 마멸을 해석하기 위해서 접촉역학의 이해는 필수적이라 할 수 있다. 하중과 운동 조건에 의한 다양한 접촉문제를 일반적으로 다루기 위해 접촉면을 중심 으로 한 접근 방법을 소개하였으며, 접촉문제의 특이성을 보이기 위해 마찰접촉문제 해석을 위한 한기법을 간단히 기술하였다. 고속 볼 베어링의 특성 해석과 접촉형상 최적설계를 통하여 광 범위한 접촉 역학의 적용의 일부를 소개하였다.

• Journal of Dental Rehabilitation and Applied Science
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• v.29 no.1
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• pp.59-68
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• 2013

The objective of this study was to analyze occlusal contact pattern of 33 young adult males with normal occlusion during lateral excursion using T-scan III system which can measure the dynamic occlusion. Occlusal contact patterns were examined and categorized in non-working side disclusion point(more functionally acceptable position) not canine-to-canine position. Disclusion time, occlusal force, and occlusal force distribution ratio of upper canine at disclusion point during lateral excursion movement was also measured and compared among the groups divided according to contact patterns. The results showed that group function was clearly more dominant than canine guidance and other occlusal contact patterns different with existing patterns were found. There were significantly difference between groups in variables of T-scan measurement. T-scan III system is effective tools to analyze and evaluate occlusal contact patterns, disclusion time, occlusal force, and occlusal force distribution ratio of upper canine at disclusion point.

• Information and Communications Magazine
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• v.29 no.7
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• pp.25-30
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• 2012

멀티터치 스크린 상에서의 접촉식 제스처 UI(User Interface)는 사용자가 안정적으로 손을 사용할 수 있는 정적인 상황에서 편리하게 사용할 수 있다. 하지만, 조깅을 한다거나 운전을 하는 등의 동적인 상황에서는 접촉식의 제스처 인터페이스는 심각한 사용성 문제를 야기 시킬 수 있다. 이에 본 연구에서는 정지 및 운동 상황 모두에서 사용할 수 있는 비접촉성 제스처 기반 인터랙션을 개발하고자 하였다. 비접촉성 제스처 UI 인식 방식은 컴퓨터 센서 제스처, 멀티 터치 제스처, 자이로 센서 세 가지로 제한하였다. 그리고 본 연구를 통해 정지 상황과 운동 상황에서 MP3 플레이어를 시용할 수 있는 제스처의 어휘 목록을 개발하였다. 마지막으로 본 연구의 제한점과 시사점을 논의하였다.

• Journal of Biomedical Engineering Research
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• v.21 no.3 s.61
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• pp.295-301
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• 2000

It is known that among many factors, relative micromotion at bone/implant interfaces can hinder bone ingrowth into surface pores of an implant. Loading conditions, mechanical properties of spinal materials, friction coefficients at the interfaces and geometry of spinal segments would affect the relative micromotion and spinal stability. A finite clement model of the human lumbar spine segments (L4-L5) was constructed to investigate the mechanical sensitivity at the interfaces between bone and cage. Relative micromotion. Posterior axial displacement. bone stress, cage stress and friction force were predicted in changes of friction coefficients, loading conditions. bone density and age-related material/geometric properties of the spinal segments. Relative micromotion (slip distance in a static loading means relative micromotion in routine activity) at the interfaces increased significantly as the mechanical properties of cancellous bone, annulus fibers or/and ligaments decrease or/and as the friction coefficient at the interfaces decreases. The contact normal force at the interfaces decreased as cancellous bone density decreases or/and as the friction coefficient increases A significant increase of slip distance at anterior annulus occurred with an addition of torsion to compressive preload. Relative micromotion decreased with an increase of disc area. In conclusion. relative micromotion, stress response. Posterior axial displacement and contact normal force are sensitive to the friction coefficient of the interfaces, bone density, loading conditions and age-related geometric/material changes.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.10a
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• pp.224-224
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• 2003

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1990.06a
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• pp.45-52
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• 1990

고도의 신뢰도를 요구하는 정밀기계의 보편화는 트라이볼로지 요소중에서 밀봉기능에 관련된 시일의 해석 및 설계가 커다란 관심사로 부각되었다. 특히 고속회전을 요하는 경우에 대한 회전 시스템의 동적 안정성은 대단히 중요하다. 미끄럼 접촉운동을 하고 있는 기계평면시일의 시일링 간극은 대단히 작기 때문에 시일의 접촉면에서 형상이 변화하게 되면 시일 성능은 커다란 영향을 받게 된다. 시일의 접촉표면 가공시 발생되는 평면도(flatness), 조립시의 회전축과 시일축 사이의 중심 맞추기의 어려움, 회전축의 자중량 등 때문에 발생되는 회전링 사이의 상대적인 경사도(misalignment)는 시일의 동적 불안정성에 영향을 준다. 또한 상대 접촉 운동면에서 경계 또는 고체 마찰에 의한 마멸의 진행은 시일의 코닝(coning) 현상을 일으킨다. 본 연구에서는 비압축성 유체가 온도의 영향을 받아 점도가 선형적으로 변화하는 경우에 대한 시일링 간극 내에서의 압력분포를 유한차분법을 이용하여 해석하였다. 여기서 얻어진 결과를 이용하여 시일의 축력과 모우멘트를 해석함으로써 시일의 동적 불안정성에 대하여 논하였다. 이 때 기계평면 시일의 형상은 코닝이 있고, 시일의 중심축이 경사진 경우를 고려하였다.