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Prognostic Value of Pretreatment Serum Alkaline Phosphatase in Nasopharyngeal Carcinoma
Xie, Ying,Wei, Zheng-Bo,Duan, Xu-Wei Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.8
Background: The prognostic value of serum alkaline phosphatase (S-ALP) has not been fully validated for nasopharyngeal carcinoma (NPC). Materials and Methods: S-ALP levels were measured in 601 patients newly diagnosed with NPC before radical treatment, and possible associations of these levels with 5-year overall survival (OS) and tumor-free survival (TFS) were explored using univariate and multivariate analyses. Results: Elevated pretreatment S-ALP (>85 U/L) was significantly less frequent among patients classified as T1+2 or stage I+II than among those classified as T3+4 or stage III+IV. Multivariate analysis showed that elevated pretreatment S-ALP (>85 U/L), age, T classification and N stage were independent predictors of poor OS and TFS. Conclusions: Pretreatment S-ALP may be a reliable biomarker to evaluate the long-term prognosis of patients with NPC.
Wei Xie 대한전기학회 2008 International Journal of Control, Automation, and Vol.6 No.2
An improved linear matrix inequality (LMI) representation of delay-independent H2 performance analysis is introduced for linear delay systems with delays of any size. Based on this representation we propose a new H₂ memoryless state feedback design. By introducing a new matrix variable, the new LMI formulation enables us to parameterize memoryless controllers without involving the Lyapunov variables in the formulations. By using a parameter-dependent Lyapunov function, this new representation proposed here provides us the results with less conservatism.
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.
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.
Acoustically aided coalescence of water droplets and dehydration of crude oil emulsion
Wei Xie,Rui Li,Xiaoping Lu,Pingfang Han,Shanlong Gu 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4
We studied the use of acoustics for coalescence of water droplets and dehydration of crude oil emulsion. Experimental studies were conducted using acoustic standing waves in a resonant cavity to trap water droplets andenhance oil separation. The focus was on the effect of ultrasound irradiation on crude oil emulsion properties, such asviscosity, water drop radius, shear strength of oil-water interfacial films, and flocculation size of asphaltene. These propertiesare important to the coalescence of water drops in water-oil (W/O) emulsion in the process of oil separation withultrasound. Ultrasound irradiation is able to decrease the emulsion stability, which provides a new insight into theacoustics-aided demulsification mechanism. It can be considered as a supplement of traditional acoustics-aided demulsificationmechanism (ultrasound-induced motion of water droplets). Furthermore, the effects of ultrasonic parameterssuch as the type of ultrasonic field, irradiation time, frequency, and acoustic intensity on dewatering the W/O emulsionare discussed. These results provide guidance for setting the optimum conditions for the separation of W/O emulsionwith ultrasound. Under the optimum conditions, water content in crude oil emulsion can be decreased from 40%to 3.8%, which satisfies the requirement of dehydration for refinery.