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김민우,김정래,허문범,Kim, Minwoo,Kim, Jeongrae,Heo, Moonbeom 항공우주시스템공학회 2010 항공우주시스템공학회지 Vol.4 No.1
The accuracy and integrity of global navigation satellite systems (GNSS) can be improved by using GNSS augmentation systems. Large ionospheric spatial gradient, during ionosphere storm, is a major threat for using GNSS augmentation systems by increasing the spatial decorrelation between a reference system and users. Ionosphere decorrelation behavior can be analyzed by using dual frequency GPS data. GNSS receivers have their own biases, called inter-frequency bias (IFB) between dual(P1 and P2) frequencies and they must be accurately estimated before computing ionosphere delays. GPS network data in Korea is used to compute each receiver's IFB, and their estimation accuracy and variability are analyzed. IFB estimation methodology to apply for ionosphere gradient analysis is discussed.
중금속 검출을 위한 나피온과 비스무스 나노입자를 이용한 초민감 전기화학 센서
김민우(Minwoo Kim),박주형(Joohyung Park),김웅(Woong Kim),박현준(Hyunjun Park),김우창(Woochang Kim),김치현(Chihyun Kim),박진성(Jinsung Park) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
We report ultra-sensitive electrochemical detection of Pb2+ and Cd2+ using Nafion blanketed Bismuth nanoplates. The anodic stripping voltammetry (ASV) analysis of Pb2+ and Cd2+ was reliable and showed high-performance. Two strategies to achieve high sensitivity are use of nanoplate and Nafion. Bismuth is used because it has high affinity toward heavy metal, and to increase contact area, bismuth nanoplates were used. However due to low conductivity of bismuth, large surface area of bismuth nanoplate modified glassy carbon electrode(GCE) decreased conductivity. Nafion, conductivity polymer, connected bismuth nanoplates while holding particle together increased the conductivity and performance of the sensor.