http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Kiseok Song,Unsoo Ha,Jaehyuk Lee,Kyeongryeol Bong,Hoi-Jun Yoo IEEE 2014 IEEE journal of solid-state circuits Vol.49 No.1
<P>A bio-feedback iontophoresis controller IC is implemented into a fabric patch for transdermal drug delivery. An iontophoresis stimulator front-end (ISFE) can provide programmable stimulation current in the range of 16-512-μA amplitude, DC-500-Hz frequency, and 3% -100% duty cycle for controllable drug delivery. For safe and robust electrical stimulation, a failure detection circuit monitors the stimulation current to prevent overcurrent and stimulation voltage saturation. For bio-feedback operation, a dual-mode impedance sensor (DMIS) measures load and tissue impedances in the range of 5-50 kΩ and 5 Ω-1 kΩ, respectively. In the DMIS, the gain of a programmable gain amplifier and the injected current level of a chopper-modulated current source are automatically controlled to minimize power consumption. The proposed IC occupies 2.35 mm × 2.35 mm including pads in a 0.11-μm 1P6M CMOS technology and dissipates a peak power of 2.2 mW. The proposed IC is directly integrated on a 9 cm × 4 cm fabric circuit board together with a 6.2-mAh coin battery for convenient iontophoresis treatment. The proposed system provides a maximum dosage range of 87 mA·min, which is larger range than the 80- mA·min dosage range of a commercial iontophoresis patch. Using a reconfigurable tetra-polar electrode configuration, load and tissue impedances are measured during the iontophoresis treatment to provide bio-feedback. The proposed iontophoresis system is successfully verified by both in-vitro and in-vivo tests.</P>
A Wirelessly Powered Electro-Acupuncture Based on Adaptive Pulsewidth Monophase Stimulation
Kiseok Song,Long Yan,Seulki Lee,Yoo, Jerald,Hoi-Jun Yoo IEEE 2011 IEEE transactions on biomedical circuits and syste Vol.5 No.2
<P>A wirelessly powered electro-acupuncture (EA) system with adaptive-pulsewidth (APW) monophase stimulation is presented for convenient invasive medicine. The proposed system removes cumbersome wires connected between EA nodes and an EA controller in order to realize both patients' convenience and remedial values simultaneously. An ultra-low-power stimulator integrated circuit (IC) that is integrated on the flexible-printed-circuit board (F-PCB) is attached to the tip of a needle electrode. Combined with a conductive yarn helical antenna wound around the needle electrode, the EA node receives wireless power from the EA controller using 433 MHz with the maximum loss of 6 dB. A zero-<I>V</I>th nMOS rectifier harvests a supply voltage of 1.0 V from a -16-dBm incoming power signal with 32% efficiency. To deal with a body impedance variation (BIV) in the range of 100-200 kΩ , the proposed APW stimulator IC, fabricated in a 0.18-μm 1P6M complementary metal-oxide semiconductor CMOS process and occupying 1.56 mm<SUP>2</SUP>, enables constant charge injection of 80-nC/stimulation. To ensure the patients' safety, the EA node (a pair of EAs) shares ground and clock wires to operate in alternate monophase (AMP) fashion for neutralizing the injected charge. The proposed wirelessly powered EA node was verified by applying it to a chunk of pork as a body model with the wireless power supplied from an RF signal generator (output power of 10 dBm and located 30 cm away).</P>
Kiseok Song,Unsoo Ha,Seongwook Park,Joonsung Bae,Hoi-Jun Yoo IEEE 2015 IEEE journal of solid-state circuits Vol.50 No.4
<P>A multi-modal spectroscopy IC combining impedance spectroscopy (IMPS) and multi-wavelength near-infrared spectroscopy (mNIRS) is proposed for high precision non-invasive glucose level estimation. A combination of IMPS and mNIRS can compensate for the glucose estimation error to improve its accuracy. The IMPS circuit measures dielectric characteristics of the tissue using the RLC resonant frequency and the resonant impedance to estimate the glucose level. To accurately find resonant frequency, a 2-step frequency sweep sinusoidal oscillator (FSSO) is proposed: 1) 8-level coarse frequency switching (f<SUB>STEP</SUB> = 9.4 kHz) in 10-76 kHz, and 2) fine analog frequency sweep in the range of 18.9 kHz. During the frequency sweep, the adaptive gain control loop stabilizes the output voltage swing (400 mV<SUB>p-p</SUB>). To improve accuracy of mNIRS, three wavelengths, 850 nm, 950 nm, and 1,300 nm, are used. For highly accurate glucose estimation, the measurement data of the IMPS and mNIRS are combined by an artificial neural network (ANN) in external DSP. The proposed ANN method reduces the mean absolute relative difference to 8.3% from 15% of IMPS, and 15-20% of mNIRS in 80-180 mg/dL blood glucose level. The proposed multi-modal spectroscopy IC occupies 12.5 mm 2 in a 0.18 μm 1P6M CMOS technology and dissipates a peak power of 38 mW with the maximum radiant emitting power of 12.1 mW.</P>
Ryu, KiSeok,Song, Jeonghoon,Kang, Shin-Geol 大邱大學校附設 基礎科學硏究所 1998 基礎科學硏究 Vol.15 No.2
New five-coordinate copper(II) complexes [Cu(L)(X)]^(+) (L=2, 3, 4, or 5; X^(-)=Cl^(-), Br^(-), SCN^(-), or N₃^(-)) have been prepared by the reactions of the pentaaza macrocyclic complexes [Cu(L)]^(2+) with NaX. The complexes [Cu(L)(X)]^(+), in which the anion X^(-) is coordinated to the metal ion, have square-pyramidal coordination geometry. The complexes [Cu(L)(X)]^(+) dissolve in water to give mixtures of the square-pyramidal and square-planar [Cu(L)]^(2+) species. The equilibrium for the copper(ll) complexes in NaX aqueous solutions has been examined. The equilibrium constants (K) are affected by the nature of the anions and the structure of the macrocyclic ligands. Synthesis, characterization, and solution behaviors of the square-pyramidal copper(II) complexes are described.
CAE를 이용한 파워트레인의 방사소음 저감을 위한 구조변경
송민근(Minkeun Song),이상권(Sangkwon Lee),오기석(Kiseok Oh) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
One of the key elements in efforts to minimize noise radiation from a powertrain is the knowledge of the main radiating component and the relation between the surface vibration of a powertrain and the sound pressure. In this research, the powertrain model is developed based on FEM (finite element method). This model is applied to predict the vibration of a powertrain by using ADAMS and the radiation noise by using BEM (boundary element method). According to this numerical analysis, the surface vibration of a powertrain is investigated as a source of radiated noise. This surface vibration is caused by the Ist order natural vibration of the cylinder block and its mode shape is the torsion mode. Therefore, this mode shape is modified to reduce the surface vibration of the powertrain. The radiation noise of the modified powertrain is also reduced to 5~12㏈. This modification is very successful for the noise reduction based on the CAE technology.