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Prediction of Impedance Characteristics of MLCC Using Multiconductor Transmission Line Theory
Jeon, Jiwoon,Lee, Heekwon,Pu, Bo,Kim, Jong-Hyeon,Zhang, Nan,Nah, Wansoo IEEE 2016 IEEE transactions on electromagnetic compatibility Vol.58 No.6
<P>This paper proposes an equivalent circuit model of a multilayer ceramic capacitor (MLCC), in which the impedance characteristics of an MLCC could be predicted at design stage before fabrication and measurement. An MLCC can be divided into three regions: end, overlap, and nonoverlap regions depending on the spatial structure of the plates, and the parameters, such as R, L, G, and C are calculated in each region analytically using partial inductance of rectangular plates or/and multiconductor transmission line theory. The measured and EM-simulated impedance of an MLCC coincides to the calculated impedance from the proposed model quite nice over almost the whole frequency range of interests, which proves the validness of the proposed model. Since calculation time is actually nil using the proposed model, compared to the time using the EM simulation, the model can be very useful when one needs to design an MLCC, especially when one needs a lot of iterations to obtain the final design target of an MLCC.</P>
Maglev(UTM-02) Brake System Change from Pneumatic Bake System to Hydraulic Brake System
Kim, Kinam,Hwang, Sungwoon,Jeon, Heekwon The Korean Society for Railway 2015 International Journal of Railway Vol.8 No.1
The Maglev(UTM-02) project is leading by Korea Institute of Machinery & Materials and financially supported from the ministry of Commerce, Industry and Energy. The early development stagy of Maglev(UTM-02) was adopted the general urban railway pneumatic brake system due to the Korea domestic industrial environment. Currently there is two commercial operation Light Railway Train(LRT) system in Korea. One is U-Line in Uijungbu, and the other is Everline in Yongin. Both LRT systems are adopting high performance light weight hydraulic brake system. But those design and manufacturing core technology of the brake system is came from a major brake system companies located from aboard. Currently various studies have been continued to increase practical application and to improve competitiveness on performance for each sub-system of Maglev. Also in case of brake system, developing competitive hydraulic brake system is required. In this study, we have introduced the development process and performance evaluation of the new hydraulic brake system of Maglev.