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Huang Cong-Sheng 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.1
Real-time and accurate estimating state-of-charge (SOC) of a lithium-ion battery is a critical but technically challenging task for battery management systems. Coulomb counting algorithm is an efective real-time SOC estimation algorithm but sufers from three typical faults: initial SOC fault, battery capacity fault, and biased load current measurement fault, making its estimation accuracy challenging in practice. To solve the above-mentioned problem, this paper proposes a model-based fault diagnosis algorithm for the Coulomb counting algorithm. The proposed algorithm efectively diagnoses the faults, where the diagnosis requires merely the load current and the terminal voltage of the battery without extra measurements or prior knowledge of the battery. Also, this algorithm is performed alongside the Coulomb counting algorithm either intermittently or remotely in the cloud to ensure the real-time SOC estimation feature of the Coulomb counting algorithm. To showcase the performance of the proposed algorithm, two experiments: a battery discharging experiment using a standard electric vehicle driving profle and a Monte Carlos experiment were performed. Both experiments well-demonstrate the efectiveness of the proposed battery electric circuit model-based SOC estimation algorithm in diagnosing the three typical faults of the Coulomb counting algorithm with 100% true-positive rates.
Cong Ma, Jie Huang,Jie Huang,Yi Tang Zhong,Kangzhen Xu,Jirong Song,Zhao Zhang 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.7
Two new high-nitrogen energetic compounds ZTO·2H2O and ZTO(phen)·H2O have been synthesized (where ZTO = 4,4-azo-1,2,4-triazol-5-one and phen = 1,10-phenanthroline). The crystal structure, elemental analysis and IR spectroscopy are presented. Compound 1 ZTO·2H2O crystallizes in the orthorhombic crystal system with space group Pnna and compound 2 ZTO(phen)·H2O in the triclinic crystal system with space group P-1. In ZTO(phen)·H2O, there is intermolecular hydrogen bonds between the -NH group of ZTO molecule (as donor) and N atom of phen molecule (as acceptor). Thermal decomposition process is studied by applying the differential scanning calorimetry (DSC) and thermo thermogravimetric differential analysis (TG-DTG). The DSC curve shows that there is one exothermic peak in ZTO·2H2O and ZTO(phen)·H2O, respectively. The critical temperature of thermal explosion (Tb) for ZTO·2H2O and ZTO(phen)·H2O is 282.21 oC and 195.94 oC, respectively.
The Effect of Beta-Herding on Taiwan’s Market: DCC-MIDAS Approach
Yi Chang Chen Cong Huang,Chunxiu Qiu,Yantong Jin,Xinyi Ma 한국유통과학회 2017 KODISA ICBE (International Conference on Business Vol.2017 No.-
The aim of this study is to investigate the herding of beta transmission between return and volatility. We have used the dynamic conditional correlation model with the mixed-data sampling (DCC-MIDAS) model for the analysis. Evidence demonstrates that herding is a key transmitter in Taiwan’s stock market. The significant estimation of DCC-MIDAS explains the herding phenomenon is highly dynamic and time-varying in herding behavior. By means of time-varying beta of herding based on our rolling forecasting method and robustness check of the Markov switching regression approach using four types of portfolios, we find evidence of superior forecasting ability of the model indicates that there are conditional correlations between betas and herding. The evidence also reveals herding formation in Taiwan’s markets during the subprime crisis period.
High Performance Wilkinson Power Divider Using Integrated Passive Technology on SI-GaAs Substrate
Cong Wang,Cheng Qian,De-Zhong Li,Wen-Cheng Huang,Nam-Young Kim 한국전자파학회JEES 2008 Journal of Electromagnetic Engineering and Science Vol.8 No.3
An integrated passive device(IPD) technology by semi-insulating(SI)-GaAs-based fabrication has been developed to meet the ever increasing needs of size and cost reduction in wireless applications. This technology includes reliable NiCr thin film resistor, thick plated Cu/Au metal process to reduce resistive loss, high breakdown voltage metalinsulator-metal(MIM) capacitor due to a thinner dielectric thickness, lowest parasitic effect by multi air-bridged metal layers, air-bridges for inductor underpass and capacitor pick-up, and low chip cost by only 6 process layers. This paper presents the Wilkinson power divider with excellent performance for digital cellular system(DCS). The insertion loss of this power divider is ?0.43 ㏈ and the port isolation greater than ?22 ㏈ over the entire band. Return loss in input and output ports are ?23.4 ㏈ and ?25.4 ㏈, respectively. The Wilkinson power divider based on SI-GaAs substrates is designed within die size of 1.42 ㎟.
( Huang Yuan Kai ),( Yao Sheng Chen ),( De Lin Mo ),( Pei Qing Cong ),( Zu Yong He ) 한국미생물 · 생명공학회 2012 Journal of microbiology and biotechnology Vol.22 No.3
Xylanase has been used extensively in the industrial and agricultural fields. However, the low-yield production of xylanase from native species cannot meet the increasing demand of the market. Therefore, improving the heterologous expression of xylanase through basic gene optimization may help to overcome the shortage. In this study, we synthesized a high-GC-content native sequence of the thermostable xylanase gene xynB from Streptomyces olivaceoviridis A1 and, also designed a slightly AT-biased sequence with codons completely optimized to be favorable to Pichia pastoris. The comparison of the sequences` expression efficiencies in P. pastoris X33 was determined through the detection of single-copy-number integrants, which were quantified using qPCR. Surprisingly, the high GC content did not appear to be detrimental to the heterologous expression of xynB in yeast, whereas the optimized sequence, with its extremely skewed codon usage, exhibited more abundant accumulation of synthesized recombinant proteins in the yeast cell, but an approximately 30% reduction of the secretion level, deduced from the enzymatic activity assay. In this study, we developed a more accurate method for comparing the expression levels of individual yeast transformants. Moreover, our results provide a practical example for further investigation of what constitutes a rational design strategy for a heterologously expressed and secreted protein.
Investigation of Grinding Characteristic using Nanofluid Minimum Quantity Lubrication
Cong Mao,Xiaojun Tang,Hongfu Zou,Xiangming Huang,Zhixiong Zhou 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
Conventional grinding fluid is widely used in grinding process, which results in high consumption and impacting the environment. The promising alternative to conventional dry and fluid coolant application is minimum quantity lubrication (MQL). It is known that the cooling and lubrication performance of the grinding fluid is the key technical area for the success application of MQL grinding process. In this study, Water based Al2O3 nanofluid was applied to grinding process with MQL approach for its excellent convection heat transfer and thermal conductivity properties. The grinding characteristics of hardened AISI 52100 steel were investigated and compared with those of wet, dry and pure water MQL grinding. Experimental results show that water based Al2O3 nanofluid MQL grinding can significantly reduce the grinding temperature, decrease the grinding forces, improve the ground surface morphology and reduce the surface roughness in comparison to pure water MQL grinding. Furthermore, the cooling and lubricating mechanism for nanofluid MQL grinding was discussed in detail.
Cong-hai Zhang,Sheng-jiao Yan,Sheng-qiang Pan,Rong Huang,Jun Lin 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.4
A series of novel chiral tert-amino alcohols 4a-h derived from enantiomerically pure phenylalanine were synthesized efficiently and used as chiral ligands in the catalytic enantioselective ethylation of aldehydes with diethylzinc (diethylzinc-to-aldehyde addition). The use of 10 mol % of the amino alcohols led to the corresponding sec-alcohols with excellent enantioselectivities (up to 100% ee) and high yields.