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허도성,신수범,김민석,김혜숙 인제대학교 1999 仁濟論叢 Vol.15 No.1
시간상에서 나타나는 화학반응에서의 비선형적 현상을 살펴본다. 주기적으로 진동하는 시스템과 복잡하게 진동하는 시스템에 대해 이론적 배경과 실험 결과, 그리고 활용 가능성에 대해 역사적 배경과 함께 고찰한다. We have studied the nonlinear phenomena in chemical reaction system. A historical and thermodynamic background about the nonlinear phenomena was considered at first, and we studied the chemical oscillations, complex chemical oscillation patterns, and chaos phenomena including the nonlinear phenomena of living system. Key Word : nonlinear dynamics, chemical oscillations, complex oscillations, chaos phenomena
Basavaraja, Chitragara,Park, Do-Young,Choe, Young-Min,Park, Hyun-Tae,Zhao, Yan Shuang,Yamaguchi, Tomohiko,Huh, Do-Sung Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.5
Molecular recognition for a specific cation depending on the change of the oxidation state of the metal catalyst component contained in the hydrogel network has been studied in a self-oscillating hydrogel. The selfoscillating hydrogels are synthesized by the copolymerization of N-isopropylacrylamide (NIPAAm), lead methacrylic acid (Pb(MAA)2), and Ru(bpy)3 2+ monomer as a metal catalyst component. The recognition for a specific cation (in this study, Ca2+ has been used) is characterized by the adsorbed amount of Ca2+ into the gel. The recognition of the gels for Ca2+ is higher at the temperature below the LCST, and also higher at the oxidized state than at reduced state of the metal catalyst component which corresponds to a more swollen state. Moreover, a propagating wave induced by a periodic change of the oxidation state with the diffusion phenomena in the oscillating hydrogel shows a possibility for temporal and site-specific molecular recognition due to the local swelling of the gel.
A Multichannel Oscillator for a Resonant Chemical Sensor System
Lee, Hyunjoo Jenny,Kwan Kyu Park,Oralkan, Omer,Kupnik, Mario,Khuri-Yakub, Butrus T. IEEE 2014 IEEE transactions on industrial electronics Vol.61 No.10
<P>Vapor detection using highly sensitive miniaturized resonant sensors is of great interest for many applications, including consumer, industrial, and environmental applications. An operational-amplifier-based multichannel oscillator that interfaces with a 50-MHz capacitive micromachined ultrasonic transducer array is presented for chemical sensing applications. The circuit was implemented in a 0.18-μm CMOS technology to reduce power consumption, number of wires, and active area per channel. The presented integrated circuit also addresses the potential-frequency-locking problem between channels by allowing the open-loop gain to be adjustable off-chip. The feasibility of the developed oscillator for the chemical sensing application is demonstrated. Two channels that were operated simultaneously achieved excellent volume sensitivities of 8.5 × 10<SUP>-4</SUP>%/Hz and 3.9 × 10<SUP>-4</SUP>%/Hz, respectively, to relative humidity in N<SUB>2</SUB>.</P>
Optical Constants and Dispersion Parameters of CdS Thin Film Prepared by Chemical Bath Deposition
박욱동 한국전기전자재료학회 2012 Transactions on Electrical and Electronic Material Vol.13 No.4
CdS thin film was prepared on glass substrate by chemical bath deposition in an alkaline solution. The optical properties of CdS thin film were investigated using spectroscopic ellipsometry. The real (ε1) and imaginary (ε2) parts of the complex dielectric function ε(E)=ε1(E) + iε2(E), the refractive index n(E), and the extinction coefficient k(E) of CdS thin film were obtained from spectroscopic ellipsometry. The normal-incidence reflectivity R(E) and absorption coefficient α(E) of CdS thin film were obtained using the refractive index and extinction coefficient. The critical points E0 and E1 of CdS thin film were shown in spectra of the dielectric function and optical constants of refractive index,extinction coefficient, normal-incidence reflectivity, and absorption coefficient. The dispersion of refractive index was analyzed by the Wemple-DiDomenico single-oscillator model.
Optical Constants and Dispersion Parameters of CdS Thin Film Prepared by Chemical Bath Deposition
Park, Wug-Dong The Korean Institute of Electrical and Electronic 2012 Transactions on Electrical and Electronic Material Vol.13 No.4
CdS thin film was prepared on glass substrate by chemical bath deposition in an alkaline solution. The optical properties of CdS thin film were investigated using spectroscopic ellipsometry. The real (${\varepsilon}_1$) and imaginary (${\varepsilon}_2$) parts of the complex dielectric function ${\varepsilon}(E)={\varepsilon}_1(E)+i{\varepsilon}_2(E)$, the refractive index n(E), and the extinction coefficient k(E) of CdS thin film were obtained from spectroscopic ellipsometry. The normal-incidence reflectivity R(E) and absorption coefficient ${\alpha}(E)$ of CdS thin film were obtained using the refractive index and extinction coefficient. The critical points $E_0$ and $E_1$ of CdS thin film were shown in spectra of the dielectric function and optical constants of refractive index, extinction coefficient, normal-incidence reflectivity, and absorption coefficient. The dispersion of refractive index was analyzed by the Wemple-DiDomenico single-oscillator model.
Chitragara Basavaraja,Do Young Park,Young Min Choe,Hyun Tae Park,Yan Shuang Zhao,Tomohiko Yamaguchi,Do Sung Huh* 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.5
Molecular recognition for a specific cation depending on the change of the oxidation state of the metal catalyst component contained in the hydrogel network has been studied in a self-oscillating hydrogel. The self-oscillating hydrogels are synthesized by the copolymerization of N-isopropylacrylamide (NIPAAm), lead methacrylic acid (Pb(MAA)2), and Ru(bpy)32+ monomer as a metal catalyst component. The recognition for a specific cation (in this study, Ca2+ has been used) is characterized by the adsorbed amount of Ca2+ into the gel. The recognition of the gels for Ca2+ is higher at the temperature below the LCST, and also higher at the oxidized state than at reduced state of the metal catalyst component which corresponds to a more swollen state. Moreover, a propagating wave induced by a periodic change of the oxidation state with the diffusion phenomena in the oscillating hydrogel shows a possibility for temporal and site-specific molecular recognition due to the local swelling of the gel.
Implementation of Excitatory CMOS Neuron Oscillator for Robot Motion Control Unit
Jing Lu,Jing Yang,김용빈,Joseph Ayers,김경기 대한전자공학회 2014 Journal of semiconductor technology and science Vol.14 No.4
This paper presents an excitatory CMOS neuron oscillator circuit design, which can synchronize two neuron-bursting patterns. The excitatory CMOS neuron oscillator is composed of CMOS neurons and CMOS excitatory synapses. And the neurons and synapses are connected into a close loop. The CMOS neuron is based on the Hindmarsh-Rose (HR) neuron model and excitatory synapse is based on the chemical synapse model. In order to fabricate using a 0.18 um CMOS standard process technology with 1.8V compatible transistors, both time and amplitude scaling of HR neuron model is adopted. This full-chip integration minimizes the power consumption and circuit size, which is ideal for motion control unit of the proposed bio-mimetic micro-robot. The experimental results demonstrate that the proposed excitatory CMOS neuron oscillator performs the expected waveforms with scaled time and amplitude. The active silicon area of the fabricated chip is 1.1 mm2 including I/O pads.
Implementation of Excitatory CMOS Neuron Oscillator for Robot Motion Control Unit
Lu, Jing,Yang, Jing,Kim, Yong-Bin,Ayers, Joseph,Kim, Kyung Ki The Institute of Electronics and Information Engin 2014 Journal of semiconductor technology and science Vol.14 No.4
This paper presents an excitatory CMOS neuron oscillator circuit design, which can synchronize two neuron-bursting patterns. The excitatory CMOS neuron oscillator is composed of CMOS neurons and CMOS excitatory synapses. And the neurons and synapses are connected into a close loop. The CMOS neuron is based on the Hindmarsh-Rose (HR) neuron model and excitatory synapse is based on the chemical synapse model. In order to fabricate using a 0.18 um CMOS standard process technology with 1.8V compatible transistors, both time and amplitude scaling of HR neuron model is adopted. This full-chip integration minimizes the power consumption and circuit size, which is ideal for motion control unit of the proposed bio-mimetic micro-robot. The experimental results demonstrate that the proposed excitatory CMOS neuron oscillator performs the expected waveforms with scaled time and amplitude. The active silicon area of the fabricated chip is $1.1mm^2$ including I/O pads.
Swelling/Deswelling Self-Oscillating of Microgels Induced by the BZ Reaction with Fe(phen)3 Catalyst
Jie Ren,Jinfen Gu,Li Tao,Guangcheng Zhang,Wu Yang 한국고분자학회 2016 Macromolecular Research Vol.24 No.6
A novel kind of microgels, poly(NIPAAm-co-Fe(phen)3-co-AAc), were prepared by copolymerization N-isopropylacrylamide (NIPAAm), acrylic acid (AAc) and iron(II) 5-acrylamide-1,10-phenanthroline-bi(1,10-phenanthroline) (Fe(phen)3), the catalyst for the Belousov-Zhabotinsky (BZ) reaction. The microgels were characterized by FT-IR spectroscopy, X-ray photoelectron spectroscopy (XPS), dynamic light scattering (DLS) and scanning electron microscope (SEM). In addition, the self-oscillating behaviors of the microgels were investigated in BZ system free of catalyst. Both the redox potential and transmittance self-oscillation were observed. Moreover, the amplitudes of poly(NIPAAm-co-Fe(phen)3-co-AAc) microgels are much larger than those of linear polymer and gel. This advantage originated from the special structure, size and composition of the microgels.