http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
천리안위성 2A호 위성영상을 위한 영상융합기법의 비교평가
이수봉,최재완,Lee, Soobong,Choi, Jaewan 한국측량학회 2022 한국측량학회지 Vol.40 No.4
기후변화 감시에 위성 자료 활용을 위해 GCOS (Global Climate Observing System)는 시공간 해상도, 시간 변화에 따른 안정성, 불확실도 등의 요구사항을 제시하고 있다. 천리안위성 2A호의 경우, 센서의 한계로 인해 산출물들이 공간해상도 조건에 충족하지 못하는 경우가 많다. 따라서 본 연구에서는 영상융합 기법들을 천리안위성 2A호 영상에 적용하여 산출물 생성 시 활용될 수 있는 최적의 기법을 찾고자 한다. 이를 위해 CS (Component Substitution), MRA (Multiresolution Analysis), VO (Variational Optimization), DL (Deep Learning)에 포함되는 총 6가지 영상융합 기법을 활용하였다. DL의 경우 합성적(Synthesis) 특성 기반 방법을 훈련자료 구축에 사용하였다. 합성적 특성 기반 방법의 과정은 PAN (Panchromatic)과 MS (Multispectral) 영상의 공간해상도 차이만큼 두 영상의 해상도를 낮춰 융합 영상을 생성한 후 원본 MS 영상과 비교한다. 합성적 특성 기반 방법은 공간해상도를 저하시킨 PAN 영상과 MS 영상 간 기하 특성이 같아야 사용자가 원하는 수준의 융합 영상을 제작할 수 있다. 하지만, 훈련자료 구축 시 비유사성이 존재하기에 이를 최소화하는 방법으로 무작위 비율을 활용한 PSGAN 모델(PSGAN_RD)을 추가로 활용하였다. 융합 영상의 검증은 일관성(consistency) 및 합성적 특성 기반 정성적, 정량적 분석을 수행하였다. 분석 결과, 영상융합 알고리즘 중 GSA가 공간 유사도를 나타내는 평가지수에서 가장 높은 수치를 보였으며, 분광 유사도를 나타내는 지수들은 PSGAN_RD 모델의 정확도가 가장 높았다. 융합 영상의 공간 및 분광 특성을 모두 고려한다면 PSGAN_RD 모델이 천리안위성 2A호 산출물 제작에 가장 최적일 것으로 판단하였다. In order to detect climate changes using satellite imagery, the GCOS (Global Climate Observing System) defines requirements such as spatio-temporal resolution, stability by the time change, and uncertainty. Due to limitation of GK-2A sensor performance, the level-2 products can not satisfy the requirement, especially for spatial resolution. In this paper, we found the optimal pan-sharpening algorithm for GK-2A products. The six pan-sharpening methods included in CS (Component Substitution), MRA (Multi-Resolution Analysis), VO (Variational Optimization), and DL (Deep Learning) were used. In the case of DL, the synthesis property based method was used to generate training dataset. The process of synthesis property is that pan-sharpening model is applied with Pan (Panchromatic) and MS (Multispectral) images with reduced spatial resolution, and fused image is compared with the original MS image. In the synthesis property based method, fused image with desire level for user can be produced only when the geometric characteristics between the PAN with reduced spatial resolution and MS image are similar. However, since the dissimilarity exists, RD (Random Down-sampling) was additionally used as a way to minimize it. Among the pan-sharpening methods, PSGAN was applied with RD (PSGAN_RD). The fused images are qualitatively and quantitatively validated with consistency property and the synthesis property. As validation result, the GSA algorithm performs well in the evaluation index representing spatial characteristics. In the case of spectral characteristics, the PSGAN_RD has the best accuracy with the original MS image. Therefore, in consideration of spatial and spectral characteristics of fused image, we found that PSGAN_RD is suitable for GK-2A products.
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.