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Focus issue introduction: Advanced Solid-State Lasers (ASSL) 2013.
Jeong, Yoonchan,Jiang, Shibin,Gallo, Katia,S?dmeyer, Thomas,Hehlen, Markus,Taira, Takunori Optical Society of America 2014 Optics express Vol.22 No.7
<P>The editors introduce the focus issue on 'Advanced Solid-State Lasers (ASSL) 2013,' which is based on the topics presented at a congress of the same name held in Paris, France, from October 27 to November 1, 2013. This focus issue, jointly prepared by Optics Express and Optical Materials Express, includes 21 contributed papers (18 for Optics Express and 3 for Optical Materials Express) selected from the voluntary submissions from attendees who presented at the congress and have extended their work into complete research articles. We hope this focus issue offers a good snapshot of a variety of topical discussions held at the congress and will contribute to the further expansion of the associated research areas.</P>
이윤찬 ( Yoonchan Lee ),심경아 ( Gyeongah Sim ),김병수 ( Byung-su Kim ),현정원 ( Jungwon Hyun ),김현철 ( Hyunchul Kim ),백문성 ( Moon Seong Baek ),김철홍 ( Cheol-hong Kim ),현인규 ( In-gyu Hyun ),최정희 ( Jeong-hee Choi ) 대한천식알레르기학회 2021 Allergy Asthma & Respiratory Disease Vol.9 No.2
The Sézary syndrome is a leukemic form of cutaneous T-cell lymphoma characterized by the presence of erythroderma covering at least 80% of the body-surface area, lymphadenopathy, and the presence of clonally related neoplastic T cells with cerebriform nuclei (Sézary cells) in the blood, skin, and lymph nodes. Hypereosinophilia can be caused by hematologic malignancy with clonal abnormality, which is often associated with Sézary syndrome. Sézary syndrome has rarely been reported in Korea. However, hypereosinophilia in the Sézary syndrome has not been reported in Korea. Here, we report a case of 75-year-old man with hypereosinophila, erythroderma, and cutaneous T-cell lymphoma which was finally diagnosed as Sézary syndrome. (Allergy Asthma Respir Dis 2021;9:93-98)
Park, Kyoungyoon,Jeong, Yoonchan Optical Society of America 2014 Optics express Vol.22 No.7
<P>We propose a novel quasi-mode interpretation (QMI) method to represent acoustic radiation modes in acoustically antiguiding optical fibers (AAOFs) in terms of discrete quasi-modes. The QMI method readily enables one to obtain the full quasi-modal properties of AAOFs, including the complex propagation constants, mode center frequencies, and field distributions in an intuitive and much simplified way, compared to other previous methods. We apply the QMI method to analyze the Brillouin gain spectrum of an AAOF that has typically been used to mitigate stimulated Brillouin scattering of optical waves. The result based on the QMI method is in good agreement with the numerical and experimental results for the same fiber structure previously reported in the literature. Considering the effectiveness and simplicity of its numerical procedure, we expect the use of the QMI method can further be extended to even more complicated numerical analyses with acoustic radiation modes, which include the acoustically antiguiding, large-core optical fibers in multi-mode regimes.</P>
Hyuntai Kim,Yoonchan Jeong 한국광학회 2018 Current Optics and Photonics Vol.2 No.5
We investigate the radiation characteristics of radially polarized light and azimuthally polarized light through plasmonic subwavelength-scale annular slit (PSAS) structures, by means of both theoretical and numerical methods. Effective-medium theory was utilized to analyze the characteristics of PSAS structures, and the corresponding results showed that PSAS structures can function as a metallic medium for azimuthally polarized light, or as a low-loss dielectric medium for radially polarized light. Numerical calculations based on the finite-element method were also performed, to verify the theoretical analyses. It turned out that the numerical results supported the theoretical results. Moreover, we exploited the PSAS structures in novel nanophotonic elements with dual functionalities that could selectively focus or pass/block incident light, depending on its polarization state. For example, if PSAS structures were implemented in the dielectric region of a metallic Fresnel zone plate, the modified zone plate could function as a blocking element to azimuthally polarized light, yet as a focusing element to radially polarized light. On the contrary, if PSAS structures were implemented in the metallic region of a metallic Fresnel zone plate (i.e. the inverted form of the former), it could function as a focusing element to azimuthally polarized light, yet as a simple transparent element to radially polarized light.
정순묵(Soonmook Jeong),윤승현(Seunghyun Yoon),이경민(Kyungmin Lee),최동원(Dongwon Choi),이윤찬(Yoonchan Lee),권기호(Key Ho Kwon),전재욱(Jae Wook Jeon) 한국HCI학회 2012 한국HCI학회 학술대회 Vol.2012 No.1
최근 스마트폰이나 태블릿 PC 같은 모바일 기기를 이용하여 이동 중에도 다양한 업무처리나 개인적 활동이 가능해 졌다. 그러나 이것은 어디까지나 가상 세계에 한정 되어 있어, 사용자와 실 세계간의 어떤 물리적이고 직접적인 인터랙션은 어려웠다. 그러나 어떤 실제적 객체를 통해 이러한 가상의 세계와 실 세계를 이어 줄 수 있는데, 대표적 사례는 원격제어 로봇을 이용하는 것이다. 본 연구는 사용자의 모바일 장치를 이용하여 언제, 어디서나 실세계와의 직접적인 인터랙션을 가능케 해주는 원격 화상로봇 시스템과 이를 사용자가 쉽고 편리하게 제어 할 수 있게 해주는 인터랙션 방법을 제안한다. 이를 통해 로봇 조종자는 시간적, 공간적 제약 없이 간편하게 원격지 실제 환경과 접촉 할 수 있다. 가령, 퇴근 길 버스 안에서 원격 로봇을 통해 해외 유명 쇼핑센터를 직접 돌아다닐 수 있고, 유명 박물관을 관람할 수 도 있다. 이렇게 다양한 사회적 활동에 직접 참여함으로써 기존 가상 세계에서의 경험과는 다른 새로운 사용자 경험을 체험할 수 있다. Recently using the mobile device such as the smartphone and the table PC, the user can implement the various tasks and individual activities on the move. However since it is merely belonged in the virtual world, the physical and the direct interaction between the user and the real world was difficult using the mobile device. However through the some practical object, the virtual world and real world can be connected. The representative case is to use the remote control robot. This research proposes the remote video robot system which can provide the direct interaction to the real world using mobile device at anytime and anywhere and the interaction method for providing the easy and the convenient control to the user. Through it, robot pilot can simply contact to the remote real environment without the temporal and spatial limitation. Suppose using the remote robot, you can directly roam in the overseas well-known shopping center and view the famous museum during going home by bus. The user can do new experience differently from previous one in virtual world in attending directly the various social activities.
Adiabatically tapered splice for selective excitation of the fundamental mode in a multimode fiber.
Jung, Yongmin,Jeong, Yoonchan,Brambilla, Gilberto,Richardson, David J Optical Society of America 2009 Optics letters Vol.34 No.15
<P>We propose a simple and effective method to selectively excite the fundamental mode of a multimode fiber by adiabatically tapering a fusion splice to a single-mode fiber. We experimentally demonstrate the method by adiabatically tapering splice (taper waist=15 microm, uniform length=40 mm) between single-mode and multimode fiber and show that it provides a successful mode conversion/connection and allows for almost perfect fundamental mode excitation in the multimode fiber. Excellent beam quality (M(2) approximately 1.08) was achieved with low loss and high environmental stability.</P>
Vazquez-Zuniga, Luis A.,Jeong, Yoonchan IEEE 2012 IEEE Photonics Technology Letters Vol.24 No.17
<P>We present a compact all-fiberized erbium-doped fiber ring laser, which generates linearly polarized picosecond pulses with a maximum bandwidth of 135 nm and excellent spectral flatness. The pulse energy and width are reconfigurable from 0.7 to 1.1 nJ and from 6.5 to 220 ps, respectively, via controlling the pumping power and/or the cavity finesse. We also analyze the relative intensity noise (RIN) characteristics of the source that results in <TEX>${-}{\rm 97}~{\rm dB}$</TEX> at low frequencies (up to 100 kHz) and <TEX>${-}{\rm 104}~{\rm dB}$</TEX> at high frequencies (up to 5 MHz), respectively. In particular, the high-frequency RIN is attributed to the spontaneous Raman scattering generated in the laser and of a comparable level with that of a commercial supercontinuum source based on a mode-locked fiber laser.</P>