http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
제민규,안상혁,정대성 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Introduction of fluorenone, benzothiadiazole, dibenzothiophene sulfone units as acceptor and bithiophene as a donor (FO-BT, BZT-BT, DBS-BT) enables relative studies on the effects of chemical property of acceptor on photocatalytic activity for HER. Ultraviolet photoelectron spectroscopy shows energy difference between fermi level and HOMO level decrease in the same order with the case of optical bandgap resulting the highest intrinsic p-doping density of BZT-BT. In terms of HER, DBS-BT outperforms all other polymers showing the maximum HER of 2617 μmol g<SUP>-1</SUP> h<SUP>-1</SUP> (λ > 420 nm) for 25 mg photocatalyst when dispersed in the presence of a triethyl amine sacrificial donor. As a result, we expect not only the high water-affinity of sulfone group enhances HER by improving statistical opportunity of molecular contact between DBS-BT conjugated backbone and water molecules, but also ambipolar characteristic of DBS-BT promotes HER by transporting electron to proton and hole to hole scavenger.
이종명,제민규 한국과학기술원 반도체설계교육센터 2022 IDEC Journal of Integrated Circuits and Systems Vol.8 No.3
This work proposes a switched-capacitor (SC) converter for high voltage generation required for medical ultrasound imaging system. The SC converter is quite advantageous for the implementation of an integrated circuit (IC) in terms of area. Besides, the SC converter has relatively less conduction loss than an inductive DC-DC boost converter. For these reasons, the SC converter is suitable for generating high voltages in ICs. However, the power loss of the SC converter can be analyzed by dividing it into three major losses. This work analyzes these losses and applies techniques to reduce them in order to improve the conversion gain and power efficiency. As a result, an on-chip Cockcroft-Walton SC converter using split-phase control for improved soft-charging with conversion gain 9.72 and power efficiency 70.1% suitable for the portable ultrasound imaging device is implemented. However, the measurement results of this study were worse than the simulation results due to mismatched control clock.
An Energy Efficient OLED Lamp Driver for Wearable Light Therapy Device
조동희,제민규 한국과학기술원 반도체설계교육센터 2022 IDEC Journal of Integrated Circuits and Systems Vol.8 No.1
In this study, we propose a power conversion circuit capable of self-compensation for the organic light emitting diode (OLED) based light therapy and optical platform. In order to compensate for degradation caused by a long time operation of the OLED, a constant-current driving of the OLED should be used instead of constant-voltage driving of the OLED. To increase the efficiency of the OLED lamp driver, a single-stage structure which is combined power stage and OLED current driving stage, is suggested. Also, the SenseFET-based current sensor is used for accurate, continuous, and lossless current sensing. This study was conducted based on the TSMC 180-nm BCD process and implemented a high-efficiency OLED driving system with 2V supply voltage, an efficiency of 90.9% at 1MHz.
Electrical Neural Recording System for Use in the Brain and the Peripheral Nerve
이태주,제민규 한국과학기술원 반도체설계교육센터 2021 IDEC Journal of Integrated Circuits and Systems Vol.7 No.3
This paper presents the electrical neural recording system for monitoring neural spikes in the brain and the peripheral nerve. The implemented recording system is composed of the flexible electrode array, the recording front-end integrated circuit (IC), the ground sheet, and the flexible cable. The recording front-end IC amplifies weak neural spikes residing in about 1 kHz bandwidth. Amplified neural spikes are then digitized through the successive-approximation-register analog-to-digital converter (SAR ADC) with a 10-bit resolution. The system operation is first verified using the artificial neural spike generator. Then, the system is applied to the in vivo experiment using the rat. The presented electrical neural recording system successfully monitors neural spikes in the brain and the peripheral nerve while consuming only a few μW power per channel. The recording front-end IC is fabricated using a 1-poly 6-metal (1P6M) 180-nm standard CMOS technology.
Design Techniques of Energy-Efficient Electrical Neural Recording System
이태주,제민규 한국과학기술원 반도체설계교육센터 2022 IDEC Journal of Integrated Circuits and Systems Vol.8 No.3
This paper reviews the design techniques of the electrical neural recording system for energy-efficient operation. To operate neuroprosthetics by decoding action potentials (or neural spikes) and local field potentials in vivo, the electrical neural recording system can be used. For extending the system battery lifetime in vivo and avoiding tissue damage due to the heat, the neural recording system needs to be energy-efficiently driven while consuming low power and achieving low noise performance. In this paper, three energy-efficient design techniques are reviewed with basic properties of the electrical neural recording system: 1) energy-efficient input structure of the operational transconductance amplifier, 2) neural recording front-end channel using the low supply voltage, and 3) neuronal activity-dependent recording system.
A Self-Powered Gas Sensor Integrated Circuit Based on Photovoltaic Energy Harvesting
판당헝,제민규 한국과학기술원 반도체설계교육센터 2023 IDEC Journal of Integrated Circuits and Systems Vol.9 No.1
A self-powered gas sensor integrated circuit (IC) suitable for wireless sensor nodes is designed in 0.18 μm CMOS process. The novel idea of using the output of the photovoltaic (PV) cell covered by the gas-sensing film allows the proposed sensor system to have low power consumption and compact size. A dual-input shared-inductor boost converter is used to harvest energy efficiently from two PV cells instead of connecting these cells in parallel when the system is exposed to gases. This shows up to 11% improvement of conversion efficiency at 2% H2 gas concentration. Maximum end-to-end efficiency of 88% is achieved at an output power of 3 mW, and the quiescent current is only 289 nA. An input-offset-storage autozeroing technique is used for opamp offset cancellation to achieve high-accuracy gas detection. A modified split-capacitor digital-to-analog converter (DAC) architecture is used for achieving a small area in the signal-processing block.
활성 바디 바이어스를 이용한 고속, 저전력 SOI 인버터
길준호,제민규,이경미,이종호,신형철 대한전자공학회 1998 電子工學會論文誌, D Vol.d35 No.12
We propose a new high speed and low power SOI inverter with dynamic threshold voltage that can operate with efficient body-bias control and free supply voltage. The performance of the proposed circuit is evaluated by both the BSIM3SOI circuit simulator and the ATLAS device simulator, and then compared with other reported SOI circuits. The proposed circuit is shown to have excellent characteristics. At the supply voltage of 1.5V, the proposed circuit operates 27% faster than the conventional SOI circuit with the same power dissipation. 효율적인 바디 바이어스와 자유로운 공급 전압(supply voltage)으로 동작할 수 있는 동적 문턱 전압(dynamic threshold voltage)제어를 이용한 고속, 저전력 SOI 인버터를 새로이 제안하였다. 제안된 회로의 특성을 BSIM3SOI 회로 시뮬레이터와 ATLAS 소자 시뮬레이터를 이용해 검증하였고 다른 SOI 회로와 비교함으로써 제안한 회로가 우수한 성능을 가짐을 보였다. 제안된 회로는 1.5V의 공급 전압에서 같은 전력 소모를 갖는 기존의 SOI 회로보다 27% 빠르게 동작하였다.