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스파이럴 스프링을 이용한 휴대폰 슬라이드 기구의 신뢰성 향상에 관한 연구
이수준(S. J. Lee),박종근(J. k. Park) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
In this paper, we improved the reliability of a spiral spring in semi-auto sliding mechanism of mobile phones. In an semi-auto opening mechanism of mobile phone, the spring must have sufficient reliability such that the spring force does not reduce under a half of initial value after 100000 operations. Since the inner space of the mechanism is very small, it is difficult to design a spring having sufficient reliability. We designed a spiral spring satisfying such conditions and analyzed its elastic performances using finite element method.
송동훈,서홍석,이상균,허철,박수준,Song, D.H.,Seo, H.S.,Lee, S.K.,Huh, C.,Park, S.J. 한국전자통신연구원 2021 전자통신동향분석 Vol.36 No.5
Over the last three decades, the development of Ti:sapphire femtosecond lasers has led to advancements in scientific and industrial fields. In particular, these advanced lasers show great potential for applications with bio-imaging and medical surgery, such as two-photon microscopy, nonlinear Raman microscopy, optical coherence tomography, and ophthalmic surgery. Herein, we present a detailed description of the theoretical and experimental physics of Kerr-lens mode-locked femtosecond Ti:sapphire lasers and its two-photon microscopy.
승용차의 비선형 엔진마운트를 통하여 차체에 전달되는 전달력 해석
박철희(C.H.Pak),오진우(J.W.Oh),이수준(S.J.Lee) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
Generally, rubber engine mount is used to reduce the dynamic force transmitted to the body of assenger cars. And this requires the study about the characteristics of rubber engine mount. In this study, taking into account the nonlinearity of rubber engine mount, we simulated the transmitted force to the body. For simplicity. passenger car's engine mount system was modeled into 2 degree of freedom system. Multiple Scales Method was used to study nonlinear system. As a result. a variety of secondary resonances was observed as well as primary resonance. This study shows simulations of some secondary resonances in the range of practical excitation frequency of passenger car.<br/>