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| 1 | Robust MVDR beamforming based on covariance matrix reconstruction显示文摘The minimum variance distortionless response(MVDR) beamformer has better resolution and much better interference rejection capability than the data-independent beamformers.However,the former is more sensitive to errors,such as the steering vector errors caused by direction of arrival mismatch,imprecise array calibration or any other possible factors,especially in the case of high signal-to-noise ratio(SNR).A new robust MVDR beamformer against the general steering vector errors is proposed in this paper.This method is based on the reconstruction of the covariance matrix which aims to reduce the power of the signal of interest(SOI) in the covariance matrix.The eigenanalysis is used in the process of removing the SOI component and modifying the residual covariance matrix.Simulation results show that the proposed method has excellent signal-to-interference-plus-noise ratio(SINR) performance under the mismatch condition. | MU PengCheng LI Dan YIN QinYe GUO Wei | 2013 | Science China(Information Sciences)2013，56，4： | 11 |
| 2 | A wireless secret key generation method based on Chinese remainder theorem in FDD systems显示文摘The wireless physical channel parameters are recently used to provide secret key.However,the key generation usually suffers from the quantization errors due to the noise,which decreases the key agreement ratio (KAR) between authorized users.Most existing approaches achieve high KAR by discarding some channel parameters which may lower the key generation efficiency and therefore lower the encryption strength.In the frequency-division duplex (FDD) systems,the number of reciprocal parameters,such as the multipath angle and delay,is limited.Therefore how to find a quantization method with high KAR and encryption strength is one of the major problems for secret key generation in FDD systems.In this paper,a robust quantization scheme based on grouping and shifting is proposed,in which all the available parameters are used for key generation.In addition,a key mapping method with error correction based on Chinese remainder theorem (CRT) is proposed to further improve the KAR performance.Simulations demonstrate the effectiveness of the proposed method. | WANG WenJie JIANG HongYan XIA XiangGen MU PengCheng YIN QinYe | 2012 | Science China(Information Sciences)2012，55，7： | 5 |
| 3 | Two-step transmission with artificial noise for secure wireless SIMO communications显示文摘The issue of physical layer security of the wireless single-input multiple-output(SIMO) system is addressed in this paper. We propose a two-step transmission scheme with artificial noise to improve the security and the scheme does not require the channel state information of the eavesdropper. In the first step, the destination which has multiple antennas generates a random reference symbol and artificial noise and transmits them in the direction of the source and its orthogonal space, respectively. The reference symbol is received by the source without being polluted by the artificial noise, while it is jammed by the artificial noise for the eavesdropper. In the second step, the symbol of the source is multiplied by the received reference symbol and then transmitted. Finally, the destination can directly estimate the symbol of the source using the reference symbol. However, the eavesdropper needs to additionally estimate the reference symbol for demodulating the symbol of the source, which usually obtains an inaccurate result due to the artificial noise. The informationtheoretic security of our scheme is analyzed and a lower bound of the achievable secrecy rate is derived. The performance of the new scheme is compared with that of the traditional approach under different input signals through numerical simulations. The results show that the proposed scheme outperforms the traditional SIMO approach especially in the high SNR region. | WANG Bo MU PengCheng YANG PeiZhi YIN QinYe | 2015 | Science China(Information Sciences)2015，58，4： | 4 |
| 4 | Advanced list scheduling heuristic for task scheduling with communication contention for parallel embedded systems显示文摘Modern embedded systems tend to use multiple cores or processors for processing parallel applications. This paper indeed aims at task scheduling with communication contention for parallel embedded systems and proposes three advanced techniques to improve the list scheduling heuristic. Five groups of node levels (two existing groups and three new groups) are firstly used as node priorities to generate node lists. Then the critical child technique improves the selection of a processor in the scheduling process. Finally, the communication delay technique enlarges the idle time intervals on communication links. We also propose an advanced dynamic list scheduling heuristic by combining the three techniques. Experimental results show that the combined advanced dynamic heuristic is efficient to shorten the schedule length for most of the randomly generated DAGs in the cases of medium and high communication. Our method accelerates an application up to 80% in the case of high communication and can also reduce the use of hardware resources. | MU PengCheng NEZAN Jean-Frangois RAULET Mickael COUSIN Jean-Gabriel | 2010 | Science China(Information Sciences)2010，53，11： | 4 |
| 5 | Genomic Epidemiology of ST34 Monophasic Salmonella enterica Serovar Typhimurium from Clinical Patients from 2008 to 2017 in Henan,China显示文摘Salmonella enterica serovar 4,[5],12:i:-(S.4,[5],12:i:-)is a monophasic variant of Salmonella enterica serovar Typhimurium that has emerged as a global serovar causing public health concern.To date,the epidemiology and genomic characterization of this pathogen in China have not been well described.We investigated the prevalence,antimicrobial resistance(AMR)phenotypes,and population genomics of sequence type 34(ST34)S.4,[5],12:i:-among cases of human salmonellosis in Henan Province,China.A total of 100 ST34 S.4,[5],12:i:-isolates were studied from 2008 to 2017 and found mostly resistant to ampicillin(AMP),streptomycin(STR),sulfonamides(SUL),and tetracycline(TET)(ASSu T).Bayesian phylogenetic analysis demonstrated that isolates identified in China were mostly related to the European lineage and evolved into two major clades with different resistance genes and plasmid profiles.Notably,clade 1 showed a significantly higher rate of mutations in gyr A and plasmid-mediated quinolone resistance genes.The carrying of the resistance-containing region(encoding R-type ASSu T),including bla(conferring resistance to AMP),str AB(STR),sul2(SUL),and tet(B)(TET)inserted into the flj BA operon,was responsible for most of the monophasic variants in clade 2.Inc HI2 plasmids were the dominant multi-drug resistance mobile genetic elements accounting for the transmission of acquired resistance genes in this serovar,and these were more prevalent in clade 1.Our findings highlighted the increasing prevalence of multi-drug resistant S.4,[5],12:i:-in China,along with the differential characteristics of resistance gene acquisition among various lineages.Based on our data,control measures are required to address the spread of this zoonotic pathogen.Further owing to its potential origin in food-producing animals,a'One Health'approach,should be implemented to support surveillance whilst informing interventional strategies. | Yujiao Mu Ruichao Li Pengcheng Du Pei Zhang Yan Li Shenghui Cui Séamus Fanning Li Bai | 2022 | Engineering2022，8，8： | 2 |
| 6 | Biocompatible magnetic and molecular dual-targeting polyelectrolyte hybrid hollow microspheres for controlled drug release显示文摘 | Du Pengcheng Zeng Jin Mu Bin | 2013 | Molecular Pharmaceutics2013，10，5： | 1 |
| 7 | A wideband beamforming method based on directional uniform circular arrays显示文摘A new method for solving the wideband beamforming problem is proposed in this paper based on directional uniform circular arrays.The basic idea is designing a narrowband beamforming spatial filter at a specific frequency and using the obtained filter weights directly to wideband signals,which reduces the complexities of designing and processing.Under the premise of knowing signals' direction information,this paper uses the method of least square with linear constraints to design the narrowband spatial filter.Since the directional uniform circular array is insensitive to the variation of frequency,coincident beams and notches are obtained at different frequencies of the wideband signal by using the obtained narrowband spatial filter weights.The computation complexity of array signal processing can be greatly reduced by using the method proposed in this paper,which is convenient for real-time signal processing. | MU PengCheng ,YIN QinYe & ZHANG JianGuo Ministry of Education Key Lab for Intelligent Networks and Network Security,School of Electronics and Information Engineering,Xi’an Jiaotong University,Xi’an 710049,China | 2010 | Science China(Information Sciences)2010，53，12： | 1 |
| 8 | Magnetic-targe- ted pH-responsive drug delivery system via layer-by-layer self-assembly of polyelectrolytes onto drug-containing emulsion droplets and its controlled release 显示文摘 | Mu Bin Liu Peng Du Pengcheng | 2011 | Journal of Polymer Science Part A: Polymer Chemistry2011，49，9： | 1 |
| 9 | Intrinsically stretchable polymer semiconductor based electronic skin for multiple perceptions of force,temperature,and visible light显示文摘As a stretchable seamless device,electronic skin(E-skin)has drawn enormous interest due to its skin-like sensing capability.Besides the basic perception of force and temperature,multiple perception that is beyond existing functions of human skin is becoming an important direction for E-skin developments.However,the present E-skins for multiple perceptions mainly rely on different sensing materials and heterogeneous integration,resulting in a complex device structure.Additionally,their stretchability is usually achieved by the complicated microstructure design of rigid materials.Here,we report an intrinsically stretchable polymer semiconductor based E-skin with a simple structure for multiple perceptions of force,temperature,and visible light.The E-skin is on the basis of poly(3-hexylthiophene)(P3HT)nanofibers percolated polydimethylsiloxane(PDMS)composite polymer semiconductor,which is fabricated by a facile solution method.The E-skin shows reliable sensing capabilities when it is used to perceive strain,pressure,temperature,and visible light.Based on the E-skin,an intelligent robotic hand sensing and controlling system is further demonstrated.Compared with conventional E-skins for multiple perceptions,this E-skin only has a simple monolayer sensing membrane without the need of combining different sensing materials,heterogeneous integration,and complicated microstructure design.Such a strategy of utilizing intrinsically stretchable polymer semiconductor to create simple structured E-skin for multiple perceptions will promote the development of E-skins in a broad application scenario,such as artificial robotic skins,virtual reality,intelligent gloves,and biointegrated electronics. | Dongjuan Liu Pengcheng Zhu Fukang Zhang Peishuo Li Wenhao Huang Chang Li Ningning Han Shuairong Mu Hao Zhou Yanchao Mao | 2023 | Nano Research2023，16，1： | 0 |
| 10 | An artificial neural network model for multi-flexoelectric actuation of Plates显示文摘Flexoelectric effect can be used to design actuators to control engi-neering structures including beams,plates,and shells.Multiple flexo-electric actuators method has the advantage of less stress concentration and better control effect,but the mode-dependent optimal actuator locations could influence the flexoelectric actuation effect significantly.In this work,a neural network model is established to study the optimal combinations of multiple flexoelectric actuators on a rectangular plate.In the physical model,an atomic force micro-scope(AFM)probe was employed to generate an electric field gradient in the flexoelectric patch,so that flexoelectric control force and moment can be obtained.Multiple flexoelectric actuators on the plate was considered.Case studies showed that the flexoelectricity induced stress mainly concentrate near the probe,the size and shape of the flexoelectric patch have limited effect on the actuation,hence,only the actuator positions were choosing as the input of the ANN model.Using the prediction of the neural network model,the driving effect of a large number of actuators at different positions can be quickly obtained,and the optimal position of the actuator can be analyzed more accurately. | Mu Fan Pengcheng Yu Zhongmin Xiao | 2022 | International Journal of Smart and Nano Materials2022，13，4： | 0 |
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