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고농도 수소 검출을 위한 팔라듐 나노갭 가스 센서 플랫폼 개발
나경환(KyungHwan Na),황준호(JoonHo Hwang),이장현(JangHyun Lee),남구현(Koo Hyun Nam),임시형(Si-Hyung Lim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
This study demonstrates the development of a palladium nano gap based hydrogen sensor system. The nano gap was created on a single-crystal silicon wafer by controlled occurrences of cracking, and this simple process enable the construction of nanoscale sensor platform through easy and low-cost fabrication process. Location and size of nano gap could be precisely controlled on the silicon wafer by manipulating the residual stress of the deposited silicon nitride layer and the stress concentration of fabricated notches. The palladium layer expanding isotropically with an adsorption of hydrogen gas was deposited on the crack pattern, with the thickness of 40 nm. When the palladium with a nano gap was exposed to hydrogen gas, the change of electric current flow between nano gap was monitored. Nano gap hydrogen sensor shows a short response time of < ~15 s for the hydrogen concentration of > ~ 1%.
CAE를 활용한 Hg<SUP>2+</SUP>의 초고감도 검출: 최적화된 DNA 및 Double coffee ring 기반 SERS sensor
채경환(Kyunghwan Chai),류준석(Juneseok You),박주형(Joohyung Park),김우창(Woochang Kim),김민우(Minwoo Kim),김치현(Chihyun Kim),박현준(Hyunjoon Park),김가영(Gayoung Kim),박대일(Daeil Park),박유진(Eugene Park),나성수(Sungsoo Na),박진성(Jin 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Wooyong Kim,Kunwoo Na,Kyunghwan Choi 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.11
This study presents a current sensor fault-detecting method for an electric vehicle battery management system. The proposed current sensor fault detector comprises the nonlinear battery cell model, the Luenbergertype state estimator, and a disturbance observer-based current residual generator. The features of this study are summarized as follows: 1) A nonlinear state space representation of the battery cell model is derived so that the disturbance observer considering the engaged current as an external disturbance can be applied, 2) a nonlinear model-based state observer and disturbance observer are combined to deal with the state of charge estimation as well as the unknown current estimation and 3) the concept of the normalized residual is introduced for current sensor fault detection criteria. Because the proposed method can estimate the engaged current whether the current measurement is available or not, the residual between the estimated current and measured current can capture the current sensor fault. Additionally, the normalization process ensures the current sensor fault diagnosis can be realized regardless of the magnitude of the engaged current. The performance of the proposed current sensor fault algorithm was experimentally verified under several magnitudes of engaged current scenarios using a single battery cell.
Duc Cuong Pham,Kyunghwan Na,Van Hung Pham,Eui-Sung Yoon 한국트라이볼로지학회 2009 KSTLE International Journal Vol.10 No.1/2
This paper reports an investigation on nanotribological properties of silicon nanochannels coated by a diamond-like carbon (DLC) film. The nanochannels were fabricated on Si (100) wafers by using photolithography and reactive ion etching (RIE) techniques. The channeled surfaces (Si channels) were then further modified by coating thin DLC film. Water contact angle of the modified and unmodified Si surfaces was examined by an anglemeter using the sessile-drop method. Nanotribological properties, namely friction and adhesion forces, of the Si channels coated with DLC (DLC-coated Si channels) were investigated in comparison with those of the flat Si, DLC-coated flat Si (flat DLC), and Si channels, using an atomic force microscope (AFM). Results showed that the DLC-coated Si channels greatly increased hydrophobicity of silicon surfaces. The DLC coating and Si channels themselves individually reduced adhesion and friction forces of the flat Si. Further, the DLCcoated Si channels exhibited the lowest values of these forces, owing to the combined effect of reduced contact area through the channeling and low surface energy of the DLC. This combined modification could prove a promising method for tribological applications at small scales.
Aptamer-Based Pathogen Monitoring for <i>Salmonella enterica</i> ser. Typhimurium
Shin, Woo-Ri,Sekhon, Simranjeet Singh,Kim, Seo-Gyeong,Rhee, Seung Jae,Yang, Gee Na,Won, Kyungho,Rhee, Sung-Keun,Ryu, Hojin,Kim, Kyunghwan,Min, Jiho,Ahn, Ji-Young,Kim, Yang-Hoon American Scientific Publishers 2018 Journal of biomedical nanotechnology Vol.14 No.11
필터링 기법을 이용한 농업용저수지 수위자료의 품질관리 방안
김경환 ( Kim¸ Kyung-hwan ),최규훈 ( Choi¸ Gyu-hoon ),정형모 ( Jung¸ Hyoung-mo ),주동혁 ( Joo¸ Donghyuk ),나라 ( Na¸ Ra ),최은혁 ( Choi¸ Eun-hyuk ),권재환 ( Kwon¸ Jae-hwan ),유승환 ( Yoo¸ Seung-hwan ) 한국농공학회 2021 한국농공학회논문집 Vol.63 No.5
Agricultural reservoirs are important facilities for storing or managing water for the purpose of securing agricultural water, creating and expanding agricultural production bases, and using them to increase agricultural production. In particular, the Korea Rural Community Corporation (KRC) manages agricultural reservoirs scattered across the country, and officially recognizes and distributes hydrological data to increase their public utilization and aims to improve the value of water resources. Data on the water level of agricultural reservoirs are important. However, errors such as missing values and outliners limit utilization of the data in various fields of research and industry. Therefore, water quality data measures should be devised to increase reliability. this study categorized different error types and looked at automatic correction methods to enhance the reliability of the vast hydrological data. In addition, the water level data corrected from errors were compared to the reference hydrologic data through expert judgment in accordance with the quality control procedure, and the most appropriate measures were verified. As KRC manages more agricultural reservoirs than any other institution, the proposed method of efficient and automatic water level data correction in this study is expected to increase the availability and reliability of the hydrological data.