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Compressing surface plasmons for nano-scale optical focusing
Choi, Hyeunseok,Pile, David F.,Nam, Sunghyun,Bartal, Guy,Zhang, Xiang The Optical Society 2009 Optics express Vol.17 No.9
<P>A major challenge in optics is how to deliver and concentrate light from the micron-scale into the nano-scale. Light can not be guided, by conventional mechanisms, with optical beam sizes significantly smaller than its wavelength due to the diffraction limit. On the other hand, focusing of light into very small volumes beyond the diffraction limit can be achieved by exploiting the wavelength scalability of surface plasmon polaritons. By slowing down an optical wave and shrinking its wavelength during its propagation, optical energy can be compressed and concentrated down to nanometer scale, namely, nanofocusing. Here, we experimentally demonstrate and quantitatively measure the nanofocusing of surface plasmon polaritons in tapered metallic V-grooves down to the deep subwavelength scale - approximately lambda/40 at wavelength of 1.5 micron - with almost 50% power efficiency.</P>
윤덕원,최현석,한창수,최헌종,홍원표,강은구 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-
Recently PZT is used in ultra precision mechanism field. PZT itself has a small driving range although it has a high resolution. Many methods, such as inchworm, impact driving, inertial sliding method, etc., have been applied for moving range expansion. In this study, a new actuating mechanism for rotational motion with two driving PZT is proposed. The Fixed-Fixed beam support is applied for compensation of the difference in driving force between expansion and contraction of PZT. The behavior and design parameters of the proposed mechanism are analyzed for improving performance.
윤덕원(Deokwon Yun),최현석(Hyeunseok Choi),한창수(Changsoo Han),최헌종(Hunjong Choi),홍원표(Wonpyo Hong),강은구(Eungoo Kang) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.10
Recently PZT is used in ultra precision mechanism field. PZT itself has a small driving range although it has a high resolution. Many methods, such as inchworm, impact driving, inertial sliding method, etc., have been applied for moving range expansion. In this study, a new actuating mechanism for rotational motion with two driving PZT is proposed. The actuator which is made by proposed mechanism is able to coarse motion and fine motion And we applied dual mode control to system. The behavior and design parameters of the proposed mechanism are analyzed for improving performance.
윤덕원(Deokwon Yun),최현석(Hyeunseok Choi),한창수(Changsoo Han),최헌종(Hunjong Choi),흥원표(Wonpyo Hong),강은구(Eungoo Kang) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.5
Recently PZT is used in ultra precision mechanism field. PZT itself has a small driving range although it has a high resolution. Many methods, such as inchworm, impact driving, inertial sliding method, etc., have been applied for moving range expansion. In this study, a new actuating mechanism for rotational motion with two driving PZT is proposed. The Fixed-Fixed beam support is applied for compensation of the difference in driving force between expansion and contraction of PZT. The behavior and design parameters of the proposed mechanism are analyzed for improving performance.
윤덕원(Deokwon Yun),최현석(Hyeunseok Choi),한창수(Changsoo Han),최헌종(Hunjong Choi),홍원표(Wonpyo Hong),강은구(Eungoo Kang) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
Recently PZT is used in ultra precision mechanism field. PZT itself has a small driving range although it has a high resolution. Many methods, such as inchworm, impact driving, inertial sliding method, etc., have been applied for moving range expansion. In this study, a new actuating mechanism for rotational motion with two driving PZT is proposed. The actuator which is made by proposed mechanism is able to coarse motion and fine motion And we applied dual mode control to system. The behavior and design parameters of the proposed mechanism are analyzed for improving performance.
A Three Degree of Freedom Force/Torque Sensor to Measure Foot Forces
Chao Yuan,Weijun Wang,Changsoo Han,Hyeunseok Choi 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
Wearable sensors are attracting wide interests. This paper describes design of a new high strength device that is capable of support the whole weight of human or the humanoid robots when the subjects are standing or walking. This device was modeled via the application of flexure cantilever in parallel configuration to support the large force and implement the measurement. It has three degrees of freedom τx, τy and fz which are conventionally used to validate the ground reaction force (GRF) and center of pressure (CoP) and control the humanoid robots. Furthermore, the dimension of the sensor in vertical direction is as small as 10 mm which makes it convenient to be attached to the shoes or humanoid robot foot. All these contents are contained in this paper. Firstly, the sensing principle and the structure design of this sensor are described. Next, after analyzing the structure, simulation of usual force applying cases is presented. Subsequently, acquisition system for the sensor is described. Finally, the original design of the sensor system to measure foot forces using two this sensor is mentioned.
The effects of pressure on arthritic knees in a rat model of CFA-induced arthritis.
Koo, Sung Tae,Lee, Chang-Hyung,Choi, Hyeunseok,Shin, Yong Il,Ha, Ki Tae,Ye, Hanna,Shim, Hyun Bo Association of Pain Management Anesthesiologists 2013 Pain physician Vol.16 No.2
<P>Pain is influenced by weather changes under certain circumstances, and inflammatory pain in animal models is ameliorated by pressure, but the underlying mechanism of atmospheric pressure has not been clearly elucidated.</P>