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Sae Hyuk Lee,Sumin Cho,Sunmin Jang,Donghan Lee,Dongik Kam,Jun Hyuk Choi,Zahid Hanif,Moonwoo La,Sung Jea Park,Dongwhi Choi 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.1
Electrospray ionization (ESI) process, which is one of the most widely utilized techniques to produce micro/nanoscale and uniform particles, has become an important tool in various fields owing to its advantages. However, the electrospray process has been considered to have a low degree of freedom for portability because this process conventionally requires an external power supply to high-voltage generation, which is bulky and heavy hardware. To improve the versatility and applicable area of the electrospray process, the stationary power supply with required external wiring, should be replaced in the self-powered high voltage generator. Herein, we report a fully self-powered portable electrospray system (SPES) with the high-voltage generator based on the triboelectric generator (TEG) equipped with the voltage multiplier circuit (VMC), which does not require any fixed external equipment, thereby enabling the facile spraying of droplets without spatio-temporal limitation. TEG generates an alternating voltage of up to 1.5 kV that does not suitable form to perform the electrospray process. Thus, VMC is used to boost voltage and rectify alternating voltage into direct voltage, which is suitable for the process. The integration of both the TEG and the VMC can generate several kilovolts (i.e., 6.0–8.0 kV), which is sufficiently high for this process, by harvesting biomechanical energy. Moreover, the adoption of the ring-shaped electrode in SPES enables us to conduct the electrospray process regardless of the type of substrate. As a proof-of-concept demonstration, SPES has a great versatility not only to control wettability on any substrates but also to coat the micro/nanoscale particles on the surface of the materials in applications that required portability without external power sources, such as agriculture and air sterilization technology.
급성 심근경색 환자에서 심전도상 ST 분절 상호 하강(reciprocal depression)의 임상적 의의 : 심근경색 후 경과시간에 따른 분석
장혁재 ( Hyuk Jae Chang ),박인휘 ( In Whee Park ),김정은 ( Jung Eun Kim ),이종우 ( Jong Woo Lee ),최소연 ( So Yeon Choi ),황교승 ( Gyo Seung Hwang ),윤명호 ( Myeong Ho Yoon ),신준한 ( Joon Han Shin ),탁승제 ( Seung Jea Tahk ),최 대한내과학회 2003 대한내과학회지 Vol.64 No.1
배경 : 급성 심근경색 환자에서 관찰되는 초기 심전도상의 ST 분절 상호 하강의 임상적 의의를 알아보고 특히 심근경색 발생 후 심전도 기록까지 걸린 시간에 따라 ST 분절 상호 하강의 의의가 차이를 보이는지 알아보고자 하였다. 방법 : 1999년 1월에서 2001년 5월 사이 진단받고 심전도상 ST 분절의 상승이 있었으며, 관동맥 조영술을 받은 급성 심근경색 환자 198명을 대상으로 하였다. 이들을 심근경색 부위에 따라 구분하였으며 심전도상 ST 분절 Background : To investigate the clinical significance of reciprocal ST segment depression on the presenting electrocardiogram (ECG) in patients with acute myocardial infarction (MI), in particular, this study focuses whether there is any difference accord
Hole Filling Method for Depth Image Based Rendering Based on Boundary Decision
Cho, Jea-Hyung,Song, Wonseok,Choi, Hyuk,Kim, Taejeong IEEE Signal Processing Society 2017 IEEE signal processing letters Vol.24 No.3
<P>In three-dimensional display systems, depth image based rendering is the most commonly used technique for generating images captured from a virtual viewpoint through reference views and depth maps. However, disoccluded hole filling remain a challenging issue as newly exposed area appears in the virtual view. Image inpainting based hole filling is a popular approach for filling in the hole, but the conventional methods generate annoying artifacts along the boundaries of the foreground objects. This letter presents a robust hole filling method that generates a virtual view with high quality. First, by using the local and neighboring property of the depth map, the background region is filled prior to the foreground region. Also, in the matching step to find the data to fill in, depth homogeneity is considered. Finally, based on the boundary decision using the depth property, the boundary regions are filled with background-relevant data to reduce boundary artifacts. Experimental results show that the views synthesized by the proposed method achieve higher visual comfort than the view synthesized by the existing methods.</P>