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Hong, Seokjun,Kwon, Yeongdae,Jung, Changhyun,Lee, Minjae,Kim, Taehyun,Cho, Dong-il Dan Institute of Electrical and Electronics Engineers 2018 Journal of microelectromechanical systems Vol.27 No.1
<P>Accumulated electrostatic charges on the dielectric surfaces of ion traps are known to induce stray fields, leading to ion micromotions. In typical microfabricated ion-trap chips, metal electrodes are electrically isolated using thick dielectric pillars, which can accumulate stray charges on their sidewalls. This letter presents a new microfabrication method for ion-trap chips that reduces the exposure of dielectric surfaces to trapped ions. The dielectric pillars are fabricated with large T-shaped overhangs, and the sidewalls and top surfaces are coated with AlCu (1%) films. The bottom sides of the overhang parts provide electrical isolation. To prevent oxidation of the AlCu (1%) films, the electrode surfaces are coated with an additional Au film. The fabricated chips were implemented to trap <SUP>174</SUP>Yb<SUP>+</SUP> ions, and the laser-induced stray fields were measured. The results indicated that the trap chip fabricated by the newly developed method generates significantly smaller stray fields as compared with previous chips. [2017-0233]</P>
Areas of polygons with vertices from Lucas sequences on a plane
SeokJun Hong,SiHyun Moon,박호,SeoYeon Park,SoYoung Seo 대한수학회 2023 대한수학회논문집 Vol.38 No.3
Area problems for triangles and polygons whose vertices have Fibonacci numbers on a plane were presented by A. Shriki, O. Liba, and S. Edwards et al. In 2017, V. P. Johnson and C. K. Cook addressed problems of the areas of triangles and polygons whose vertices have various sequences. This paper examines the conditions of triangles and polygons whose vertices have Lucas sequences and presents a formula for their areas.
Kim, Hojoong,Hong, Seokjun,Jin, Yinhua,Lim, Dong Hyun,Kim, Jun-yong,Hwang, Hasub,Kim, Taesung The Electrochemical Society 2017 ECS journal of solid state science and technology Vol.6 No.8
<P>The formation of a ring-shaped residue after the chemical mechanical polishing (CMP) process of a copper (Cu) interconnect was investigated. The chemical composition of the residue was analyzed and found to be copper oxide (CuO). In the present study, the mechanism of CuO formation was investigated using interdisciplinary methods. First, the wafer surface was analyzed by electrical charge mapping and chemical composition analysis. These analyses revealed that the organic residue had not been removed in the region where the ring shaped CuO residue formed. Then, with the support of the analysis data, a hypothesis on residue formation was proposed. This hypothesis includes the nozzle configuration of the cleaning tool used in CMP. Investigations by experimental observation, as well as a simulation of chemical fluid motion, were conducted. It was shown that, owing to the configuration of the cleaning tool, there exists a specific region where the concentration of cleaning chemicals is too low for removing organic residue. Then, cross-contamination occurs without chemical fluid lubrication; in other words, there is direct solid-solid contact between the wafer and cleaning brush. Finally, the organic contamination on the wafer surface forms an electrical circuit, which results in the formation of CuO residue. (C) 2017 The Electrochemical Society.All rights reserved.</P>
Kim, Hojoong,Hong, Seokjun,Shin, Cheolmin,Jin, Yinhua,Lim, Dong Hyun,Kim, Jun-yong,Hwang, Hasub,Kim, Taesung Elsevier 2017 Wear: An international journal on the science and Vol.392 No.-
<P>The surface roughness of a chemical mechanical polishing (CMP) pad provides microscopic asperities where the actual polishing takes place. Thus, the roughness should be maintained in a proper regimen to obtain stable CMP process quality. A conditioner is a key consumable in the CMP process because it maintains the roughness of the CMP pad surface against surface glazing or flattening during polishing. Because the conditioner mechanically breaks the pad surface to maintain the roughness, previous research has expressed its ability index in terms of the pad wear rate (PWR). In the present study, we investigate the reason for PWR change of CMP pads having vigorously changing moduli with respect to temperature changes during the mass production. The pad property changed steeply in the process temperature range from 60 to 80 degrees C. The tensile strength is a key property change that leads to sudden PWR drop. We found that the shape and configuration of the diamond tip are the major parameters affecting the ability to maintain surface roughness of the pads. Thus, we suggested a proper conditioner design for tungsten (W) CMP based on the experimental data to sustain the process quality and increase the consumable lifetime. As a result, the peak surface roughness has improved from 29.4 mu m to 32.6 mu m and the consumable lifetime was also increased.</P>
Augmented reality-based remote coaching for fast-paced physical task
Kim, Youngsun,Hong, Seokjun,Kim, Gerard Jounghyun Springer UK 2018 Virtual Reality Vol.22 No.1
<P>One popular application of augmented reality (AR) is the real-time guidance and training in which the AR user receives useful information by a remote expert. For relatively fast-paced tasks, presentation of such guidance in a way that the recipient can make immediate recognition and quick understanding can be an especially challenging problem. In this paper, we present an AR-based tele-coaching system applied to the game of tennis, called the AR coach, and explore for interface design guidelines through a user study. We have evaluated the player's performance for instruction understanding when the coaching instruction was presented in four different modalities: (1) Visual-visual only, (2) Sound-aural only/mono, (3) 3D Sound-aural only/3D and (4) Multimodal-both visual and aural/mono. Results from the experiment suggested that, among the three, the visual-only augmentation was the most effective and least distracting for the given pace of information transfer (e.g., under every 3 s). We attribute such a result to the characteristic of the visual modality to encode and present a lot of information at once and the human's limited capability in handling and fusing multimodal information at a relatively fast rate.</P>
도로변 초미세먼지의 실시간 질량농도 및 부피농도 측정을 이용한 시간별 밀도 분석-광흡수 eBC에 대한 OPS 보정 중심
김은영(Eunyoung Kim),서석준(Seokjun Seo),김선문(Sunmoon Kim),정성운(Sungwoon Jung),이용민(Yongmin Lee),오세호(Sea-Ho Oh),박규태(Gyutae Park),김경훈(Kyunghoon Kim),김정화(Jounghwa Kim),홍유덕(Youdeog Hong),이태형(Taehyoung Lee),배민석(Mi 한국대기환경학회 2018 한국대기환경학회지 Vol.34 No.6