http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 이중무 (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
-
NO2 sensing properties of WO3-decorated In2O3 nanorods and In2O3-decorated WO3 nanorods
이중무,현승균,Tae-Kyoung Ko,Bumhee Nam 나노기술연구협의회 2019 Nano Convergence Vol.6 No.40
n2O3 nanoparticle (NP)-decorated WO3 nanorods (NRs) were prepared using sol–gel and hydrothermal methods. The In2O3 NRs and WO3 NPs were crystalline. WO3 NP-decorated In2O3 NRs were also prepared using thermal evaporation and hydrothermal methods. The NO2 sensing performance of the In2O3 NP-decorated WO3 NR sensor toward NO2 was compared to that of the WO3 NP-decorated In2O3 NR sensor. The former showed a high response to NO2 due to a significant reduction of the conduction channel width upon exposure to NO2. In contrast, the latter showed a far less pronounced response due to limited reduction of the conduction channel width upon exposure to NO2. When the sensors were exposed to a reducing gas instead of an oxidizing gas (NO2), the situation was reversed, i.e., the WO3 NP-decorated In2O3 NR exhibited a stronger response to the reducing gas than the In2O3 NP-decorated WO3 NR sensor. Thus, a semiconducting metal oxide (SMO) with a smaller work function must be used as the decorating material in decorated heterostructured SMO sensors for detection of oxidizing gases. The In2O3 NP-decorated WO3 NR sensor showed higher selectivity for NO2 compared to other gases, including reducing gases and other oxidizing gases, as well as showed high sensitivity to NO2.
-
-
위치 기반 시스템을 위한 CMOS IR-UWB RFIC
이중무(Jung Moo Lee),박명철(Myung Chul Park),어윤성(Yun Seong Eo) 대한전자공학회 2015 전자공학회논문지 Vol.52 No.12
본 논문에서는 근거리 위치 기반 시스템을 위한 3 - 5 GHz IR-UWB(impulse radio-ultra wide band) RFIC를 제안한다. 수신기의 구조는 에너지 검출 방식으로 설계되었고, 고속 sampling을 하기 위해서 4 bit ADC 와 DLL(delay locked loop) 을 이용하여 equivalent-time sampling 기술을 사용하도록 설계되었다. 송신기는 저전력의 디지털 UWB impulse generator 를 설계하였다. 설계된 IR-UWB RFIC 는 CMOS 0.18 μm 공정을 이용하여 제작되었다. 측정된 수신기의 감도는 -85.7 dBm 이며, 송신기와 수신기는 1.8 V 전원 전압에서 각각 32 mA 와 25.5 mA 의 전류를 소모한다. This paper presents a fully integrated 3 - 5 GHz IR-UWB(impulse radio ultra-wide band) RFIC for Location based system. The receiver architecture adopts the energy detection method and for high speed sampling, the equivalent time sampling technique using the integrated DLL(delay locked loop) and 4 bit ADC. The digitally synthesized UWB impulse generator with low power consumption is also designed. The designed IR-UWB RFIC is implemented on 0.18 μm CMOS technology. The receiver"s sensitivity is -85.7 dBm and the current consumption of receiver and transmitter is 32 mA and 25.5 mA respectively at 1.8 V supply.
-
-
Enhanced Ethanol Gas Sensing Performance of the Networked Pd, In2O3-Codecorated ZnO Nanorod Sensor
이상민,선구주,이재경,현승균,이중무 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.71 No.8
ZnO nanorods codecorated with Pd and In2O3 nanoparticles were synthesized by thermal evaporation of a mixture of ZnO and graphite powders in an oxidizing atmosphere and followed by solvothermal deposition of Pd and In2O3 and their ethanol gas sensing properties were examined. Pristine ZnO nanorods, Pd-decorated ZnO nanorods and In2O3-decorated ZnO nanorods were also prepared in a similar manner. The codecorated ZnO nanorod sensor showed significantly stronger response to ethanol than the other three sensors, suggesting a synergistic effect of Pd and In2O3 codecoration. The former also showed faster response and recovery than the latter. The pristine and codecorated ZnO nanorod sensors exhibited selectivity toward ethanol over other gases such as acetone, CO, benzene, and toluene. The underlying mechanism for the enhanced sensing performance of the Pd, In2O3-codecorated ZnO nanorod sensor toward ethanol is discussed.
-
도체 위를 움직이는 자석에 작용하는 자기 저항력에 관한 연구
김두나,김민석,손지석,이중무,조형근,정희태,박찬웅 한국과학영재교육학회 2014 과학영재교육 Vol.6 No.1
The effect of the magnetic drag force due to the eddy current on the magnet's motion was investigated by measuring the position and velocity of the magnet moving above a conductor plate. As the magnet moves along an inclined conductor plate, the drag force acting on the magnet increases and finally the magnet moves with a constant velocity called a terminal velocity. The terminal velocity values of magnet with respect to the incline angle were obtained by fitting the velocity curves with the theoretical ssolution of the magnet's equation of motion and were found to be proportional to the sine value of an incline angle. By using the obtained values of the terminal velocity, drag coefficients were also calculated and the average value was 0.16086 ±0.00721(㎏/s). From these experimental results and the equation of motion of the magnet, the magnetic drag force due to the eddy current was found to be proportional to the magnet's velocity. 경사진 도체 위를 마찰 없이 운동하는 자석을 부착한 수레의 위치와 속도의 변화를 측정함으로써 도체에유도된 맴돌이 전류에 의해 수레에 작용하는 저항력의 수레의 운동에 미치는 영향과 저항력의 속도 의존성을 조사하였다. 정지 상태에서 출발한 수레는 중력에 의해 속도가 증가하였으나 속도의 변화율은 수레에 작용하는 저항력으로 인해 점차 감소하여 종단속도에 이르게 되었다. 저항력0000000000000을 받으며 운동하는 물체의 운동방정식으로부터 구한 속도 해를 이용하여 실험으로 측정한 수레의 속도 그래프를 fitting하여 경사각에 따른수레의 종단속도를 구하였다. 수레의 종단속도는 수레에 작용하는 가속도가 클수록 증가하였으며 도체 판의 경사각의 sine 값에 비례하였다. 종단속도 값을 이용하여 저항력의 저항계수 0를 구하였으며, 그 값은 평균 0.16086 ±0.00721(㎏/s)로 주어졌다. 이 결과로부터 자석에 작용하는 저항력은 자석의 속도000000000에 비례하는 힘임을 알 수 있었다.
ScienceON연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
