http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Self-Emitting Artificial Cilia Produced by Field Effect Spinning
Jeong, Woohyun,Jeong, Sang-Mi,Lim, Taekyung,Han, Chang-Yeol,Yang, Heesun,Lee, Bo Wha,Park, Sang Yoon,Ju, Sanghyun American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.38
<P>In nature, many cells possess cilia that provide them with motor or sensory functions, allowing organisms to adapt to their environment. The development of artificial cilia with identical or similar sensory functions will enable high-performance and flexible sensing. Here, we investigate a method of producing artificial cilia composed of various polymer materials, such as polyethylene terephthalate, polyurethane, poly(methyl methacrylate), polyvinylpyrrolidone, polystyrene, polyvinyl chloride, and poly (allylamine hydrochloride), using a field effect spinning (FES) method. Unlike wet- or electro-spinning, in which single or multiple strands of fibers are pulled without direction, the FES method can grow fiber arrays vertically and uniformly on a substrate in cilia-like patterns. The lengths and diameters of the vertically grown artificial cilia can be controlled by the precursor polymer concentration in the solution, applied electric current and voltage, and shape and size of the needle tip used for FES. The red, green, and blue emission characteristics of the polymer-quantum dot-based self-emitting artificial cilia prepared in polymer-inorganic nanoparticle hybrid form were determined. In addition, an artificial cilia-based humidity sensor made of the polymer-polymer composite was fabricated.</P> [FIG OMISSION]</BR>
Jeong, Ha-Neul,Ahn, Sang-Il,Na, Minkyun,Yoo, Jihwan,Kim, Woohyun,Jung, In-Ho,Kang, Soobin,Kim, Seung Min,Shin, Ha Young,Chang, Jong Hee,Kim, Eui Hyun The Korean Neurosurgical Society 2021 Journal of Korean neurosurgical society Vol.64 No.2
Objective : Electrooculography (EOG) records eyeball movements as changes in the potential difference between the negatively charged retina and the positively charged cornea. We aimed to investigate whether reliable EOG waveforms can be evoked by electrical stimulation of the oculomotor and abducens nerves during skull base surgery. Methods : We retrospectively reviewed the records of 18 patients who had undergone a skull base tumor surgery using EOG (11 craniotomies and seven endonasal endoscopic surgeries). Stimulation was performed at 5 Hz with a stimulus duration of 200 μs and an intensity of 0.1-5 mA using a concentric bipolar probe. Recording electrodes were placed on the upper (active) and lower (reference) eyelids, and on the outer corners of both eyes; the active electrode was placed on the contralateral side. Results : Reproducibly triggered EOG waveforms were observed in all cases. Electrical stimulation of cranial nerves (CNs) III and VI elicited positive waveforms and negative waveforms, respectively, in the horizontal recording. The median latencies were 3.1 and 0.5 ms for craniotomies and endonasal endoscopic surgeries, respectively (p=0.007). Additionally, the median amplitudes were 33.7 and 46.4 μV for craniotomies and endonasal endoscopic surgeries, respectively (p=0.40). Conclusion : This study showed reliably triggered EOG waveforms with stimulation of CNs III and VI during skull base surgery. The latency was different according to the point of stimulation and thus predictable. As EOG is noninvasive and relatively easy to perform, it can be used to identify the ocular motor nerves during surgeries as an alternative of electromyography.
스케치한 움직임의 속력과 궤적에 따라 링크 메커니즘을 최적화하는 디자인 도구
한우현(WooHyun Han),정윤우(Yunwoo Jeong),남택진(Tek-Jin Nam) 한국HCI학회 2019 한국HCI학회 학술대회 Vol.2019 No.2
본 논문에서는 비전문가도 원하는 속력과 궤적으로 움직이는 링크 구조를 설계할 수 있도록 돕는 기능을 개발한 내용에 대해서 소개한다. 사용자는 설계한 링크메커니즘의 한 점을 선택하고 최적화를 위해 원하는 움직임을 그린다. 그린 후, 사용자가 그린 것과 속력분포 및 궤적이 유사해지도록 링크 메커니즘을 최적화해준다. 본 기능은 원하는 움직임을 만들기 위해 기구학적 지식이 없어도 쉽게 활용할 수 있으며, 스케치 기반의 직관적인 입력 방식을 제공한다. 궤적뿐만 아니라 속력 분포까지 반영하기 때문에, 사용자의 의도를 잘 나타내는 실감나는 움직임을 쉽게 구현할 수 있도록 해준다.