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Hwang, Sean,Ha, Jangwan,Choi, Min Young,Jung, Seunguk The Korean Society of Clinical Neurophysiology 2022 Annals of Clinical Neurophysiology Vol.24 No.2
Posterior reversible encephalopathy syndrome (PRES) and reversible cerebral vasoconstriction syndrome (RCVS) are relatively uncommon neurological disorders. These two independent syndromes can be concurrent as a part of a continuum process; however, the specific mechanism is not well known. Although the relationship between RCVS and PRES is currently unclear, they could share a common pathophysiology. This case report aimed to determine the pathophysiology underlying the co-occurrence of PRES and RCVS in a patient with an acute exacerbation of chronic obstructive pulmonary disease.
Color-sensitive and spectrometer-free plasmonic sensor for biosensing applications
Kim, Seunguk,Lee, Youngjin,Kim, Jae Yeon,Yang, Jae Hoon,Kwon, Hyuk-Jun,Hwang, Jae Youn,Moon, Cheil,Jang, Jae Eun Elsevier 2019 Biosensors & bioelectronics Vol.126 No.-
<P><B>Abstract</B></P> <P>A color-sensitive and spectrometer-free sensing method using plasmonic nanohole arrays and the color components, L* , a* , and b* , of the CIELAB defined by the international commission on illumination (CIE) is introduced for the analysis of optically transparent materials in the visible range. Spectral analysis based on plasmonic nanoparticles or nanostructures can be applied to real-time bio-detection, but complex optical instrumentations and low spatial resolution have limited the sensing ability. Therefore, we take an advantage of color image processing instead of spectral analysis which induces the distinctive color information of plasmonic nanohole arrays with different transparent materials. It guarantees high spatial resolution which is essential to bio-detection such as living cells. To establish our sensing platform, the color components, L* , a* , and b* , were extracted from photo images by an image sensor, statistically processed using a JAVA program, and finally utilized as three individual sensing factors. Additionally, our study on a correlation between the spacing of plasmonic sensors and the color sensitivity to the refractive index reveals geometrically optimal conditions of nanohole arrays. The weighted mean calculation with the three individual sensing factors offers an enhanced distinction of the optical difference for transparent materials. In this work, a color sensitivity of 156.94 RIU<SUP>−1</SUP> and a minimum mean absolute error of 1.298 × 10<SUP>−4</SUP> RIU were achieved. The difference in the refractive index can be recognized up to 10<SUP>−4</SUP> level with the suggested sensing platform and the signal process. This unique color-sensitive sensing method enables a simple, easy-to-control, and highly accurate analysis without complicated measurement systems including a spectrometer. Therefore, our sensing platform can be applied as a very powerful tool to in-situ label-free bio-detection fields.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Color-sensitive and spectrometer-free analysis using plasmonic sensors. </LI> <LI> Simple and fast sensing based on pixel by pixel image processing. </LI> <LI> Highly accurate prediction of the refractive index with the error of 0.0001298 RIU. </LI> </UL> </P>
엄상철(Sangcheol Eom),강병수(Byeongsu Kang),김현섭(Hyunsop Kim),박인용(Inyong Park),김연용(Yeonyong Kim),황규훈(Kyuhun Hwang),최웅(Woong Choi),양승욱(Seunguk Yang),이현우(Hyunwoo Lee) 한국항공우주학회 2018 韓國航空宇宙學會誌 Vol.46 No.5
본 논문에서는 저궤도 지구관측위성에 적용을 목적으로 개발된 X-band용 2축 안테나지향 기구장치(Dual-axis X-band antenna pointing mechanism)의 설계부터 해석 및 검증시험 까지 개발 과정을 논하고 그 검증 결과를 기술하고 있다. 유사시스템의 개발 및 운용경험을 바탕으로 본 시스템 설계의 주안점과 요구사항을 정의하였고, 제작된 시험인증모델의 발사 및 궤도운용 환경에 대한 검증시험을 통해 시스템의 특성을 확인하였다. 본 과정 중 획득한 시스템의 특성 및 검증기법을 통해 이후 인증모델의 개선점을 도출하였다. This paper describes the design, analysis, and verification tests of the Dual-axis X-band antenna pointing mechanism(XAPM) that has been developed for the Earth observation mission at low Earth orbits. Based on the experience of development and operation of the similar system, we defined the main points and requirements of the system design and confirmed the characteristics of the system through the verification test of the launch and orbit environment test of the engineering qualification model. Through the characteristics and verification techniques of the system acquired during this process, improvement points of the later qualification model are derived.