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Choi, SooBong,Park, DooJae,Lienau, C.,Jeong, Mun Seok,Byeon, Clare C.,Ko, Do-Kyeong,Kim, D. S. The Optical Society 2008 Optics express Vol.16 No.16
<P>We demonstrate spatial control of optical near-fields by femtosecond phase shaping in one-dimensional plasmonic structures. The near-field images display striking temporal-phase dependence, switching between double- and single-peak images within one lattice constant. The change of the near-field distribution is studied in the time and spectral domain. The spectral composition change observed by varying the time delay between two phase-locked femtosecond pulses explains the spatial control of the near-field images. Modal expansion calculations of linear light transmission using the surface impedance boundary condition are in excellent agreement with experiments.</P>
Growth of Sheet-like ZnO Nanostructures on ZnO nano rods using Chemical Bath Deposition
Kim, Hyuntae,Choi, Soobong The Korean Vacuum Society 2018 Applied Science and Convergence Technology Vol.27 No.2
We demonstrate the growth of a sheet-like ZnO membrane on ZnO nano rod layers. The growth process is composed of 3 steps of ZnO seed formation, ZnO nano rod growth and sheet-like ZnO membrane formation on those nano rods. To confirm the fundamental growth mechanism, the lattice structures of each step were analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM) measurement. Analysis of the relation between the texture coefficient and the surface shape of the ZnO membrane on the ZnO nano rods shows that the surface morphology of ZnO nano structures can be controlled using the temperature of the growing solution and the concentration of the chemical solution.
램프 열 성능 예측의 신뢰도 향상을 위한 해석 프로세스 개선
최봉근(Bongkeun Choi),이철우(Chulwoo Lee),고만석(Manseok Ko),이수봉(Soobong Lee),김억(Ok Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
As lamp system is considered as one of the most important components that determine the image of car, most of manufacturers place great emphasis on lamp design for their success in the development of new car. In this research various techniques of advanced CFD analysis were suggested so as to simulate more physical phenomena and improve the accuracy of estimating lamp performance and support the effective success in esthetic design of lamp system after all.
Growth of Sheet-like ZnO Nanostructures on ZnO nano rods using Chemical Bath Deposition
Hyuntae Kim,Soobong Choi 한국진공학회(ASCT) 2018 Applied Science and Convergence Technology Vol.27 No.2
We demonstrate the growth of a sheet-like ZnO membrane on ZnO nano rod layers. The growth process is composed of 3 steps of ZnO seed formation, ZnO nano rod growth and sheet-like ZnO membrane formation on those nano rods. To confirm the fundamental growth mechanism, the lattice structures of each step were analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM) measurement. Analysis of the relation between the texture coefficient and the surface shape of the ZnO membrane on the ZnO nano rods shows that the surface morphology of ZnO nano structures can be controlled using the temperature of the growing solution and the concentration of the chemical solution.
Kim Hyuntae,Choi Soobong,Park Woongkyu,Cho Sangjoon,Kim Cheolsu 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.10
In this paper, we report that the beam profile of the near-infrared light from superluminescent diodes (SLDs) can be measured with a resolution below the diffraction limit by using the photothermal effect and scanning thermal microscopy (SThM). Due to the sub-diffraction resolution of SThM, the beam profile measured using SThM was much clearer than the beam profile obtained by using the knife-edge method. By stacking cross-sectional images of the optical beam profile obtained by using SThM, we were able to obtain successively the three-dimensional optical beam profile. Our novel method of using small probes to measure optical beam profiles is compatible with conventional microscopy systems and can potentially be used in various applications.
이상민 ( Lee Sangmin ),최광규 ( Choi Kwan-kyu ),신수봉 ( Shin Soobong ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.1
In this study, a parameter estimation algorithm is developed which can estimate stiffness and mass parameters from measured modal response, structural parameters are estimated by minimizing an output error. To solve a constrained nonlinear optimization problem, RQP and Fletcher active set Strategy are applied. A parameter grouping scheme has been adopted to control the number of unknowns. In simulation study, the proposed algorithm estimates structural parameters with miscalculated mass property in some parameter group and is applied to identify boundary properties of a substructure.