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RISS 인기검색어
- 검색키워드
- 저자 : Haijin Seo (검색결과 4 건)
- 무료
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- 유료
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Energy saving electrochromic windows from bistable low-HOMO level conjugated polymers
Shin, Haijin,Seo, Seogjae,Park, Chihyun,Na, Jongbeom,Han, Minsu,Kim, Eunkyoung The Royal Society of Chemistry 2016 ENERGY AND ENVIRONMENTAL SCIENCE Vol.9 No.1
<P>Energy saving electrochromic windows were established by controlling the interfacial charge transport using low-HOMO level (<-5 eV) pi-conjugated polymers as bistable electrochromic films and an ionic liquid as the electrolyte. It provided a long bistability (>90min) at the voltage-off state with a high color contrast (879 cm(2) C-1).</P>
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Changhan Yoon,Haijin Seo,Yuhwa Lee,Yangmo Yoo,Tai-Kyong Song,Jin Ho Chang IEEE 2012 and Frequency Control Vol.59 No.5
<P>In ultrasound exams of obese patients and the breast, the spatial and contrast resolutions of ultrasound images are severely deteriorated when a constant sound speed corresponding to soft tissue is used in receive dynamic beamformation. This degradation is due to the defocusing of the ultrasound beam because of the disparity in sound speed between soft tissue and fatty layers. To minimize the degradation, this paper proposes a new method of estimating an optimal sound speed that can be used to achieve the best beamforming performance in a region of interest (ROI). The proposed method employs a new focusing quality factor (FQF) as an indicator of how well the focusing is conducted with a given sound speed. The FQF is closely associated with the degree of edge conspicuity, which can be obtained using the proposed modified nonlinear anisotropic diffusion (MNAD) technique. To calculate FQF, ultrasound images are formed with different sound speeds ranging from 1400 to 1600 m/s and, subsequently, the ROI is chosen. In the ROI, the degrees of edge conspicuity (i.e., FQF) are calculated. The sound speed can be considered an optimal one for the ROI if it is used to construct the image that provides the maximum FQF. The performances of the proposed method were evaluated through simulation and in vitro experiments with a tissue-mimicking phantom. The performance was also compared with that of the conventional image-based method employed in a commercial ultrasound imaging system. The experimental results demonstrated that the proposed method is capable of estimating an optimal sound speed with an error of 10 m/s regardless of whether strong targets are included in the ROI or not. On the other hand, the conventional image-based method generated an estimation error of 60 m/s maximally in the case in which there were no strong targets in ROI. This indicates that the proposed method is a useful tool to improve ultrasound image quality for clinical applications, especially for ultrasound exams of obese patients and the breast.</P>
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Switchable silver mirrors with long memory effects
Park, Chihyun,Seo, Seogjae,Shin, Haijin,Sarwade, Bhimrao D.,Na, Jongbeom,Kim, Eunkyoung Royal Society of Chemistry 2015 Chemical Science Vol.6 No.1
<▼1><P>An electrochemically stable and bistable switchable mirror is achieved for the first time by introducing a thiol-modified ITO electrode to stabilize the metallic film and ionic liquids as an anion-blocking layer, to achieve a long memory effect.</P></▼1><▼2><P>An electrochemically stable and bistable switchable mirror was achieved for the first time by introducing (1) a thiol-modified indium tin oxide (ITO) electrode for the stabilization of the metallic film and (2) ionic liquids as an anion-blocking layer, to achieve a long memory effect. The growth of the metallic film was denser and faster at the thiol-modified ITO electrode than at a bare ITO electrode. The electrochemical stability of the metallic film on the thiol-modified ITO was enhanced, maintaining the metallic state without rupture. In the voltage-off state, the metal film maintained bistability for a long period (>2 h) when ionic liquids were introduced as electrolytes for the switchable mirror. The electrical double layer in the highly viscous ionic liquid electrolyte seemed to effectively form a barrier to the bromide ions, to protect the metal thin film from them when in the voltage-off state.</P></▼2>
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핸즈프리 트렁크 모듈을 위한 킥 인식 알고리즘 및 테스트방법
송봉기(Bonggi Song),권대욱(Daewook Kwon),구원(Won Ku),이석우(Seagwoo Lee),유종일(Jongil Yu),신원호(Wonho Shin),서해진(Haijin Seo) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
Recently, The needs for convenience of a driver are increased. One of the requirements of the user experience is the development of hands-free trunk module. This module can be operated by user kick when a user carry things or hold umbrella in rainy weather. In this paper, we suggest a hands-free trunk module based on kick recognition algorithm. Also we suggest a testing method for it. The suggested system uses two electrostatic capacitance sensors. The upper sensor is used to indicate user access, and the other sensor is used to recognize user kick. We also propose a testing method for hands-free trunk module using image processing..
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