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자율신경계의 활성도 측정을 위한 Data Acquisition System의 개발 및 임상응용
신동구,박종선,김영조,심봉섭,이상학,이준하 영남대학교 기초/임상의학연구소 2001 Yeungnam University Journal of Medicine Vol.18 No.1
Background: Power spectrum analysis method is a powerful noninvasive tool for quantifying autonomic nervous system activity. In this paper, we developed a data acquistion system for estimating the activity of the autonomic nervous system by the analysis of heart rate and respiratory rate variability using power spectrum analysis. Materials and methods: For the detection of QRS peak and measurement of respiratory rate from patient's ECG, we used low-pass filter and impedance method respectively. This system adopt an isolated power for patient's safety. In this system, two output signals can be obtained: R-R interval(heart rate) and respiration rate time series. Experimental ranges are 30∼240 BPM for ECG and 15∼80 BPM for respiration. Regults: The system can acquire two signals accurately both in the experimental test using simulator and in real clinical setting. Conclusion: The system developed in this paper is efficient for the acquisition of heart rate and respiration signals. This system will play a role in research area for improving our understanding of the pathophysiologic involvement of the autonomic nervous system in various disease states.
Cho, Whirang,Wu, Jinghang,Shim, Bong Sup,Kuan, Wei-Fan,Mastroianni, Sarah E.,Young, Wen-Shiue,Kuo, Chin-Chen,Epps, III, Thomas H.,Martin, David C. The Royal Society of Chemistry 2015 Physical chemistry chemical physics Vol.17 No.7
<P>We describe the synthesis and characterization of bicontinuous cubic poly(3,4-ethylenedioxythiophene) (PEDOT) conducting polymer gels prepared within lyotropic cubic poly(oxyethylene)<SUB>10</SUB> nonylphenol ether (NP-10) templates with <I>Ia</I>3&cmb.macr;<I>d</I> (gyroid, GYR) symmetry. The chemical polymerization of EDOT monomer in the hydrophobic channels of the NP-10 GYR phase was initiated by AgNO<SUB>3</SUB>, a mild oxidant that is activated when exposed to ultraviolet (UV) radiation. The morphology and physical properties of the resulting PEDOT gels were examined as a function of temperature and frequency using optical and electron microscopy, small-angle X-ray scattering (SAXS), dynamic mechanical spectroscopy, and electrochemical impedance spectroscopy (EIS). Microscopy and SAXS results showed that the PEDOT gels remained ordered and stable after the UV-initiated chemical polymerization, confirming the successful templated-synthesis of PEDOT in bicontinuous GYR nanostructures. In comparison to unpolymerized 3,4-ethylenedioxythiophene (EDOT) gel phases, the PEDOT structures had a higher storage modulus, presumably due to the formation of semi-rigid PEDOT-rich nanochannels. Additionally, the storage modulus (<I>G</I>′) for PEDOT gels decreased only modestly with increasing temperature, from ∼1.2 × 10<SUP>5</SUP> Pa (10 °C) to ∼7 × 10<SUP>4</SUP> Pa (40 °C), whereas <I>G</I>′ for the NP-10 and EDOT gels decreased dramatically, from ∼5.0 × 10<SUP>4</SUP> Pa (10 °C) to ∼1.5 × 10<SUP>2</SUP> Pa (40 °C). EIS revealed that the impedance of the PEDOT gels was smaller than the impedance of EDOT gels at both high frequencies (PEDOT ∼10<SUP>2</SUP>Ω and EDOT 2–3 × 10<SUP>4</SUP>Ω at 10<SUP>5</SUP> Hz) and low frequencies (PEDOT 10<SUP>3</SUP>–10<SUP>5</SUP>Ω and EDOT ∼5 × 10<SUP>5</SUP>Ω at 10<SUP>−1</SUP> Hz). These results indicated that PEDOT gels were highly ordered, mechanically stable and electrically conductive, and thus should be of interest for applications for which such properties are important, including low impedance and compliant coatings for biomedical electrodes.</P> <P>Graphic Abstract</P><P>The successful templated-synthesis of PEDOT in bicontinuous GYR nanostructures: highly ordered, mechanically stable and electrically conductive. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp04426f'> </P>
Multi-Functional Conductive Nanocomposites from Naturally Derived Melanin Materials
Bong Sup Shim(심봉섭) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Natural systems utilize multi-functional biocomposites by a bottom-up assembly of nanomaterials for creating hierarchical multiphasic structures, while conventional man-made composites increase one functionality by sacrificing the others. Here, we introduce multifunctional nanocomposites from natural biomaterials, including high crystalline cellulose nanofibers and conductive melanin nanoparticles. Tunic cellulose nanofibers have shown high crystallinity, straight fibrous shape, and liquid crystalline alignments. Thus, their nanocomposites showed excellent optical, mechanical, and surface properties. On the other hand, naturally derived melanin nanoparticles are molecularly structured to possess finely tunable electrochemical conductivities, optical reflectivity, and casting shape stability with inherent biocompatibility. These composites can be used as key functional materials in emerging applications such as biotic-abiotic interfaces, implantable electronics, and eco-electronics.