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외래교육사상의 한국적 수용 - 광복이후 서양교육사상의 한국적 수용(Ⅰ) -
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Predictive factors for surgical outcome in anterior clinoidal meningiomas : Analysis of 59 consecutive surgically treated cases
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진화심리학과 Bowen이론에 근거한 이성관계 향상 프로그램 개발의 이론적 고찰
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議院內閣制의 槪念
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Fibular Fixation in Same-Level Distal Third Tibiofibular Fractures: Is Fibular Fracture Regarded as a Secondary Importance?
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Molecular Mechanism of Poly(ethylene terephthalate) degrading PETase with Crystal Structure
- 검색키워드
- 저자 : Jianfeng Hong (검색결과 5 건)
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Robust model predictive control for three-level voltage source inverters
Hong, Jianfeng,Zhang, Xing,Cao, Renxian The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.5
To solve the problem of parameter mismatch in model predictive control (MPC), this paper presents a robust model predictive control method based on a fixed window optimization (FWO) algorithm for a three-level voltage source inverter that only needs to sample the current value. When compared with the traditional observer-based model predictive control (such as the Luenberger observer, sliding mode observer (SMO) and Kalman filter (KMF)), the proposed method does not require an observer with a complicated design, and its algorithm is simple and easy to understand. Meanwhile, high current sampling accuracy is not needed in the proposed method. However, it is necessary in some types of model-free predictive control. In addition, low switching frequency operation and delay compensation are also considered in this paper. In general, the proposed method is simple to implement and does not have high requirements in terms of the accuracy of its current sensor. Experimental results show that the proposed method can accurately estimate parameter values and improve the parameter robustness of MPC.
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Jianfeng Hong,Fei Pan,Ziheng Zhang,Jia Teng,Dekai He 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.3
Continuous mode changes during battery charging present a significant challenge for the application of inductive power transfer (IPT) in battery charging. Achieving constant-current (CC) and constant-voltage (CV) charging characteristics is crucial for its successful implementation. This paper proposes a variable static S-T/FC compensation topology based on switching state changes. It offers the advantages of being able to handle various load conditions, facilitating soft switching of the inverter throughout the operation process, and achieving CC and CV charging without changing the operating frequency of the system. The characteristics of the proposed topology were confirmed through a theoretical analysis. Additionally, a completely new parameter design method is proposed. The CC and CV characteristics of the proposed topology are verified through theoretical derivation and simulation analysis. Finally, a validation prototype is constructed to assess the feasibility and rationality of the proposed method, achieving a 3.5 A output current in the CC mode and a 70 V output voltage in the CV mode.
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Purification and Characterization of β-Agarase from Paenibacillus sp.
Jianfeng Mei,Zhongxiu Tang,Yu Yi,Hong Wang,Qi Wang,Guoqing Ying 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.5
β-Agarase produced by Paenibacillus sp. WL(agarase WL) was purified using a combination of ammoniumsulfate precipitation, DEAE-ion exchange, and gel-filtrationchromatography. The purity of the agarase was increasedby 11.9× with a recovery of 5.1% and a specific activity of4,670.1 U/mg of protein. The molecular mass of thepurified agarase was approximately 30 kDa (SDS-PAGE). The agarase was stable at temperature below 50oC and thefavorable agar-hydrolysis activity was at 40oC. The agarasewas active in the range of pH 5.0 to 8.0, and the optimalagar-hydrolysis pH value was approximately 6.0. Metalions normally found in seawater (Na+, K+, Ca2+, Mg2+, andAl3+) could activate agarase WL. The Michaelis-Mentenconstant Km and maximal reaction velocity Vmax of purifiedagarase WL were 3.22 mg/mL and 41.5 μg/mL·min,respectively. The agarase WL was highly agar specific.
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Jianfeng Miao,Xiaoyue Liu,Hong Jiang,Yefei Liu,Rizhi Chen 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.3
A high performance catalytic membrane was fabricated with Pd nanoparticles supported by TiO2 nanotubes, where the TiO2 nanotubes were synthesized on the ceramic membrane via a simple hydrothermal etching. A flow-through catalytic membrane reactor was developed for testing the catalytic properties in the p-nitrophenol reduction. The effect of etching time was investigated in detail and an optimal etching time was determined to be 16 h. The characterization results highlighted that the as-prepared bouquet-like TiO2 nanotubes could significantly improve the loading amount and dispersity of Pd nanoparticles. The fabricated catalytic membrane exhibited considerably improved catalytic activity and stability, with a 100% conversion of p-nitrophenol and no loss in catalytic activity during five reaction cycles. The obtained activation energy was much lower than the values in literatures, implying that the p-nitrophenol reduction could take place more easily on our catalytic membranes compared to other catalysts.
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Preparation of highly efficient Al-doped ZnO photocatalyst by combustion synthesis
M. Ahmad,E. Ahmed,Yuewei Zhang,N.R. Khalid,Jianfeng Xu,M. Ullah,Zhanglian Hong 한국물리학회 2013 Current Applied Physics Vol.13 No.4
Novel Al-doped ZnO (AZO) photocatalysts with different Al concentrations (0.5e6.0 mol%) were prepared through a facile combustion method and followed by calcination at 500 ℃ for 3 h. The obtained nanopowders were characterized by powder X-ray diffraction (XRD), scanning electron microscope (SEM) combined with EDX, transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR), UVevis spectroscopy and photoluminescence spectroscopy. The XRD patterns of AZO nanopowders were assigned to wurtzite structure of ZnO with the smallest crystallite size about 11 nm consistent with the results from TEM. The doping of Al in ZnO crystal structure successfully suppressed the growth of ZnO nanoparticles confirmed by XRD patterns. The absorption spectra analysis showed that the optical band gap energy (Eg) for the AZO nanopowders were in the range of 3.12-3.21 eV and decreased with increasing of Al dopant. The photocatalytic activities of the samples were evaluated by photocatalytic degradation of methyl orange under visible light (λ≥ 420 nm) and sunlight irradiation. The results showed that the AZO photocatalyst doped with 4.0 mol% Al exhibited five times enhanced photocatalytic activity compared to pure ZnO. The enhanced photocatalytic activity could be attributed to extended visible light absorption, inhibition of the electronehole pair’s recombination and enhanced adsorptivity of MO dye molecule on the surface of AZO nanopowders.
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