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유한요소해석을 이용한 헬리컬기어의 동적해석에 관한 연구
윤승태(Seungtae Yun),이정석(Jungsuk Lee),윤문영(Moonyoung Yoon),김흥섭(Heungseob Kim),부광석(Kwangsuk Boo) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In this paper, the analysis of the contact stress in helical gear tooth flanks presents due to impact loading such as the sudden engagement and disengagement of gear. The stress analysis was implemented for different roll positions to find out the most critical roll angle and the contact stress and dynamic analysis is performed for this critical roll position. Dynamic analysis was implemented by Implicit time integration method in Abaqus/Implicit. In order to make the accurate results, Analysis was conducted in very short interval based on time.
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윤문영(Moonyoung Yoon),윤승태(Seungtae Yun),이정석(Jungsuk Lee),부광석(Kwangsuck Boo),김흥섭(Heungseob Kim) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The purpose of this paper is to verify the procedure and estimation by comparing Effective Fatigue Load of Equivalent von Mises method in frequency domain with Multi-axial Rainflow method in time domain. In addition, by verifying new von Mises method considering phase difference, the purpose is not only to verify the performance of this method, but to prepare the ground for other method for multi-axial fatigue analysis in frequency domain on a multi-axial loading condition. Fatigue life prediction about the early study has been mainly conducted on uni-axial loading condition. Therefore, Fatigue life prediction has been proceeded through Miner’s rule in time domain and Dirlik’s method in frequency domain. However, most circumstances we can access have a bi-axial loading condition and a complex multi-axial loading condition. The bigger load history is, the longer analysis time becomes, because fatigue analysis method needs to know all load history. In addition, resonance may happen when random loading occurs by vibration. Therefore, fatigue analysis in frequency domain is actively going along now.
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경륜 장외발매소 이용자의 도박동기, 몰입, 문제도박과의 관계에서 이용빈도의 조절된 매개효과
이소영(Soyoung Lee),최혜진(Hyejin Choi),윤수인(Suin Yoon),최순례(Soonlye Choi),이홍직(Hongjik Lee),윤승태(Seungtae Yun) 한국콘텐츠학회 2019 한국콘텐츠학회논문지 Vol.19 No.3
본 연구의 목적은 도박동기와 도박몰입, 그리고 문제도박의 경로와 개입지점을 입증하는 데 있다. 이를 위하여 경륜 장외발매소 이용자의 도박동기가 도박몰입을 매개로 문제도박에 영향을 미치는 경로와 그 과정에서 경륜장 이용빈도의 조절된 매개효과를 검증하였다. 이를 위해 장안 경륜장외발매소 이용 성인을 대상으로 2018년 9월 13일과 15일, 평일과 주말 양일간 실시한 설문조사 자료를 활용하여, 최종 411사례를 분석하였다. 분석결과, 도박 참여동기인 유희·흥분·회피·사교·금전 동기에 따른 문제도박의 인과관계를 도박몰입이 매개하여 정적효과를 나타냈다. 본 연구의 주된 관심사인 도박동기-몰입-문제도박의 매개경로에서의 이용빈도의 조절된 매개효과가 통계적으로 유의미한 것으로 나타났다. 구체적으로는 유희동기 및 금전동기는 도박동기와 도박몰입, 도박몰입과 문제도박 두 경로에서 각각 모두 이용빈도의 조절효과가 통계적으로 유의미하였다. 또한 흥분동기와 회피동기, 사교동기가 각각 투입된 모형에서는, 이용빈도의 조절효과가 도박몰입과 문제도박의 인과관계에서만 유의미한 것으로 나타났다. 이러한 연구결과를 토대로 본 연구에서는 장외발매소 이용자를 위한 개입 및 이용자 보호규제를 위한 임상적·정책적 제언을 하였다. The purpose of this study is to verify the path of the motivation, the flow, and problem gambling and intervention points. To this end, we verified the mediation effect of the motivation of the users outside sales offices influences the problem gambling through a flow and the moderated mediation effect of the frequency of the use of a bicycle racing tracks in that process. A total of 411 cases were analyzed using surveys conducted for one day on a weekday and weekend (September 13th and 15th 2018) for adults using an outside sales office in Jangan. According to the analysis, the causality of gambling by gambling motivation(amusement, excitement, avoidance, society, money) showed its effect positively by mediating the flow. The adjusted effect of the frequency of the use on the intermediary effect of the motivation → flow → problem gambling behavior, which is the main concern of this study, was found to be statistically significant. More specifically, the effect of adjusting the frequency of the use was statistically significant in both paths: motivation/flow and flow/problem gambling. It was also shown that, in the model with excitement, avoidance and social motivation, the adjustment of the frequency was only significant in the causal relationship between the flow and problem gambling. Based on these findings, this study made clinical and policy suggestions for intervention for gamblers and user protection regulations.
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