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Xie Wei,Chen Jun,Gu Yu,Ma Jiachen,Chang Jiaqing 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.2
Range issue has become the concern focus in the field of electric vehicles. In contrast to the generally used State-of-Charge (SoC), battery State-of-Energy (SoE) is regarded more appropriate in representing the remnant driving range by taking account of the voltage decline across the discharging process. In this paper, a SoE estimator is constructed using a pseudo power definition upon battery open-circuit-voltage (OCV) to exclude the energy loss on internal resistance; simultaneously, by combining with an equivalent circuit model (ECM), the unscented particle filter (UPF) is exploited to deal with problems of model nonlinearities, internal interferences, sensor noises and accumulated errors. Further, to adapt to battery time-variant features, the ECM parameters are on-line identified resorting to the recursive least square with forgetting factor algorithm. Finally, SoE estimation experiments using the proposed estimator on a LiFePO4 battery show superior performance regarding robustness and accuracy against high-dynamic loads and various temperatures.
A New C-10 Acetylene and A New Triterpenoid from Conyza canadensis
Xie, Wei-Dong,Gao, Xue,Jia, Zhong Jian 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.5
From the whole plants of Conyza canadensis (Compositae), a new C-10 acetylene, namely 8R, 9R-dihydroxymatricarine methyl ester (1), and a new triterpenoid, namely 3${\beta}$ 16${\beta}$, 20${\beta}$-trihydroxytaraxast-3-O-palmitoxyl ester (4), were isolated along with eleven known compounds(2, 3, 5-13). The structures of all 13 compounds were elucidated on the basis of their spectral data. The antibacterial activities of compounds 1-3 were evaluated.
A New C-10 Acetylene and A New Triterpenoid from Conyza canadensis
Wei Dong Xie,Xue Gao,Zhong Jian Jia 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.5
From the whole plants of Conyza canadensis (Compositae), a new C-10 acetylene, namely 8R, 9R-dihydroxymatricarine methyl ester (1), and a new triterpenoid, namely 3β, 16β, 20β–trihydroxytaraxast- 3-O-palmitoxyl ester (4), were isolated along with eleven known compounds (2, 3, 5-13). The structures of all 13 compounds were elucidated on the basis of their spectral data. The antibacterial activities of compounds 1-3 were evaluated.
Massive MIMO Full-Duplex Relaying with Hardware Impairments
Wei Xie,Xiaochen Xia,Youyun Xu,Kui Xu,YurongWang 한국통신학회 2017 Journal of communications and networks Vol.19 No.4
Massive multiple-input-multiple-output full-duplex relaying(MM-FDR), which exploits both the benefits of large-scaleantenna arrays and full-duplex transmission, is considered as apromising technology to achieve very high spectral efficiency inthe future wireless network. Despite the inevitable presence oftransceiver impairments due to the use of low-cost hardware components,most of the prior works on MM-FDR assume perfecttransceiver hardware which is unrealistic in practice. This paperinvestigates the impact of hardware impairments on the MM-FDR. Based on the recent experimental results, the effect of hardware impairmentsis modeled using transmit and receive distortion noises. The end-to-end achievable rate is derived and the scaling behaviorsof echo interference due to the full-duplex operation, multi-userinterference and effective distortions caused by hardware impairmentsare obtained. The scaling results show that the achievablerate of MM-FDR is limited by the hardware impairments at thesources and destinations, instead of that at the relay or other interferences,as the number of relay antenna tends to infinity. Alow-complexity power control scheme is proposed to further improvethe energy efficiency of MM-FDR with hardware impairments. Simulation results show that the proposed scheme can improvethe spectral-energy efficiency tradeoff significantly.