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CMOS 호환 가능한 Si₃N₄ 기반 저항 변화 메모리의 점진적 저항 변화 특성 분석
김민휘(Min-Hwi Kim),김성준(Sungjun Kim),방수현(Suhyun Bang),김태현(Tae-Hyeon Kim),이동근(Dong Keun Lee),조성재(Seongjae Cho),박병국(Byung-Gook Park) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
In this work, we investigated gradual resistance switching operation of our fabricated silicon nitride-based bipolar RRAM. The phenomenon is considered to occur by insertion of additional SiO2 layer between Si3N4 switching layer and Si bottom electrode. In pulse operation, the effect of pulse condition such as pulse width, rise/fall time and paek voltage on gradual switching characteristics is investigated thoroughly.
김민휘(Kim Min-Hwi),임희원(Lim Hee-Won),신우철(Shin U-Cheul),김효중(Kim Hyo-Jung),김현기(Kim Hyun-Ki),김종규(Kim Jong-Kyu) 한국태양에너지학회 2018 한국태양에너지학회 논문집 Vol.38 No.2
South Korea aims to shift the 20 percent of electricity supplement from the fossil fuel including the nuclear to renewable energy systems by 2030. In order to realize this agenda in the buildings, the plus energy house is necessary to increase the renewable energy supplement beyond the zero energy house. This paper suggested KePSH (KIER Energy-Plus Solar House) and energy performance of house and renewable energy systems was investigated. The KePSH has the target of generating 40% surplus energy than the conventional house energy consumption. The plus energy house is the house that generates surplus energy from the renewable energy sources than that consumes. In order to minimize the cooling and heating load of the house, the shape design and passive parameters design were conducted. Based on the experimental data of the plug load in the typical house, the total energy consumption of the house was estimated. This paper also suggested renewable energy sources integrated HVAC system using air-source heat pump system. Two cases of renewable energy system integration methods were suggested, and energy performance of the cases was investigated using TRNSYS 17 program. The results showed that the BIPV (building integrated photovoltaic) system (i.e., CASE 1) and BIPV and BIST system (i.e., CASE 2) shows 42% and 29% of plus energy rate, respectivey. Also, CASE 1 can generate 59% more surplus energy compared with the CASE 2 under the same installation area.
외기전담시스템기반 초고층 공동주택 중앙집중식 환기시스템 설계지원 전산 프로그램 개발
김진효(Kim Jin-Hyo),김민휘(Kim Min-Hwi),조현(Cho Hyun),김관우(Kim Kwan-Woo),김현배(Kim Hyun-Bae),정재원(Jeong Jae-Weon) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(계획계)
A dedicated outdoor air system (DOAS) comprised of enthalpy wheel, cooling coil, sensible wheel and supply/exhaust fan is able to decouples ventilation and air-conditioning functions and/or sensible and latent load functions. It removes the entire latent load and a portion of the sensible load inside a conditioning zone using 100% outdoor air ventilation. The remaining sensible load is accommodated by a parallel mechanical cooling system. According to the literature, a DOAS based centralized ventilation system shows good potentials for using in high-rise multi-family houses. The main object of this paper is to develop a simple computer program which can be used in the preliminary design phase of a DOAS applied to high-rise apartment buildings.
대용량 메모리 어레이 시뮬레이션을 위한 양극성 저항 변화 메모리 회로 모델링
김민휘(Min-Hwi Kim),정성헌(Sunghun Jung),김성준(Sungjun Kim),박병국(Byung-Gook Park) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
In this paper, a circuit model of the filamentary-type resistive memory cell was proposed for RRAM array circuit simulations. DC characteristics are fitted for fabricated and measured RRAM devices by optimizing three resistor elements. Transient characteristics of the model have been investigated. It was found that switching characteristics can be improved by minimizing the parasitic capacitances. For different materials and conduction mechanisms, the characteristics of resistive memories can be fitted simply by controlling several parameters.
김민휘(Min-Hwi Kim),이동원(Dong-Won Lee),김득원(Deuk-won Kim),허재혁(Jaehyoek Heo) 대한설비공학회 2021 설비공학 논문집 Vol.33 No.1
In this study, the existing small-scale centralized-district cooling and heating system was retrofitted to form a small-scale heat network with two thermal-energy prosumers, and we empirically analyzed the feasibility of this bi-directional thermal network. In the experimental test, we identified the operation status of a small-scale thermal network based on existing solar thermal and geothermal heat pumps and modified it to form a bi-directional thermal-network system. The bi-directional heat supply was created by calibrating two thermal-energy prosumers to supply heat at predetermined times and converting the absorption heat pump in another building into another thermal prosumer. This experiment confirmed that bi-directional thermal transfer can be accomplished in a thermal network as well as in the conventional heat-supply method. The results of these empirical experiments also showed that the use of bi-directional thermal networks in heat transactions is economically feasibility and eco-friendly.