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액상공정으로 제작된 ZrInZnO 박막 트랜지스터의 전기적 특성에 관한 연구
정태훈,김시준,윤두현,정웅희,김동림,임현수,김현재,Jeong, Tae-Hoon,Kim, Si-Joon,Yoon, Doo-Hyun,Jeong, Woong-Hee,Kim, Dong-Lim,Lim, Hyun-Soo,Kim, Hyun-Jae 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.6
Soution-processed ZrInZnO (ZIZO) thin-film transistors (TFTs) with varying Zr content were fabricated. The ZIZO TFT (Zr=20 at. %/Zn) has an optimal performance with the saturation field effect mobility of 0.77 $cm^2/Vs$, the threshold voltage (Vth) of 2.1 V, the on/off ratio of $4.95{\times}10^6$, and subthreshold swing (S.S) of 0.73 V/decade. Using this optimized ZIZO TFT, the positive and negative gate bias stress according to annealing temperature was also investigated. While the Vth shifts dramatically after 1,000 s of both gate bias stresses, variations in the S.S are negligible. It suggests that electrons or holes are tem porarily trapped in the gate insulator, the semiconductor, or the interface between both layers.
산화아연바리스터 기반의 1-포트 서지보호장치의 최적 설계 기법
정태훈(Tae-Hoon Jeong),김용성(Young-Sung Kim),박근보(Geun-Bo Park),이승일(Seung-Il Lee) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.4
본 논문은 뇌격전류에 따른 저압 배전계통의 전자식 전력량계 및 배전 패널의 통신설비와 전원장치를 보호할 목적으로 사용하는 서지보호장치(SPD)에 관한 것이다. 서지보호장치(SPD)는 접속방식에 따라 1-포트 서지보호장치(SPD)와 감결합 요소를 포함한 2-포트 서지보호장치(SPD)로 구분된다. 뇌격전류에 대한 내부 시스템의 보호는 협조된 서지 보호체계를 이루는 계통적인 접근이 필요하다. 이에 대응하기 위해 이론적인 검토를 통해 피뢰구역(LPZ) 정의에 대한 고찰 및 해석을 진행하였다. 뇌서지에 의한 뇌격전류는 상당히 크기 때문에 하나의 서지보호장치(SPD)로 방호하기에는 한계가 발생하며, 이를 해결하기 위해 다단의 종속적으로 서지보호장치(SPD)를 설치하게 된다. 본 논문에서는 전력계통에 있어 한전계통에 연계되는 Incoming side가 아닌 건물 내에 설치되는 분기형 배전패널 내부의 전자식 전력량계 및 각종 통신(제어)설비를 보호할 목적으로 한전계통이 연계되는 MOF 단에 설치되는 LPZ0에 해당 하는 피뢰기(LA, SA)와 보호협조를 이루는 LPZ1과 LPZ2의 경계영역에 설치하는 저압 배전계통용 Ⅱ등급 서지보호장치(SPD)에 대해 설계를 하였다. 또한 감결합 요소가 없고, 부하 전류를 흘릴 수 있는 직렬 접속 방식의 1-포트 서지보호장치(SPD)에 대한 최적의 설계 방안을 도출하고 실험을 통해 기존의 방식과 비교하여 성능 개선과 관련한 검증을 실시하였다. This paper reports a Surge Protective Device (SPD) that is used to protect an automatic metering interface(AMI) power supplies of communication equipment on a low-voltage distribution system from a lightning current. The surge protective device (SPD) can be classified as one-port SPDs and two-port SPDs with decoupling elements depending on the connection type. The protection of internal systems against the lightning current may require a(LPZ) was studied and interpreted through a theoretical review. Because the lightning current resulting from a lightning surge is considerably high, there is limited protection from one SPD; therefore, coordinated cascaded MOV-basde SPDs are installed to solve this problem. Regarding the power grid mentioned in this paper, a class Ⅱ SPD for the low-voltage distribution system installed on the border of LPZ1 and LPZ2, which establish a protection coordination with the Arrester (LA, SA) that corresponds to the LPZ0 installed on the MOF stage connected to on system were designed to protect various communication (control) equipment, including the automatic meter reading system inside the branch-type electric supply panel of a building, not the incoming side of one system. In addition, performance-related tests were done by a comparison with the existing method through testing, and the optimal design was achieved for the 1-port SPD that uses a series connection and can bleed load current without any decoupling element.
상태 모니터링 기술을 적용한 대용량 EES의 낙뢰 보호 연구
정태훈(Tae-Hoon Jeong),김주용(Ju-Yong Kim),김윤호(Yun-Ho Kim) 한국조명·전기설비학회 2018 조명·전기설비학회논문지 Vol.32 No.6
Recently with continuous growth of smart-grid and micro-grid caused by green growth according to the change of electric power industry`s paradigm, renewable energy and EES(Electrical Energy Storage system) are extended widely. Also, EES is gradually extended the scope of the use to power stabilization and improvement of power quality related to renewable energy, etc. These EESs are connected to the existing power system in various ways depending on the POC(Point Of Connection) position. Recently, the frequency of lightning stroke has been increasing with climate change. Therefore, large-scale EES need to electrical equipment protective device such as LPS(Lightning Protection System) from lightning stroke. In this paper, we have consider of LPS for EES and study about condition monitoring system of the various protective device.
정태훈(Tae-Hoon Jeong),김주용(Ju-Yong Kim) 한국조명·전기설비학회 2019 조명·전기설비학회논문지 Vol.33 No.10
Recently, electrical energy storage system(ESS) have been used in a wide range of applications, for example, in connection with renewable energy (Photovoltaic power generation, wind power generation, etc.) to improve energy efficiency, frequency regulation and power stabilization. Also, mobile devices such as portable IT devices (smart phones, notebooks, smart mobility, etc.) demand is rapidly increasing. As a result, the supply of battery energy storage system(BESS) based on lithium batteries also rapidly increasing. In addition to that fire accidents have been increasing due to complex problems such as ESS management, poor operation and inadequate installation environment. In this paper, protection circuit module(PCM) and battery management system(BMS) of battery energy storage module(BESM) in BESS has contemplated. In connection with the common problem of thermal runaway of battery management, the safety enhancement for thermal stability is simulated through temperature sensing for individual cells. To this end, embedded-based multi-channel temperature monitoring compensates the limitation of temperature monitoring has battery protection devices(PCM and BMS etc.). Also, to overcome the problem of rapidly the battery life aging due to over-voltage and under-voltage protection of transient range based on PCM, we propose a BMS using embedded module and PCM with module level voltage & current management function.