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Novel distributed UEP rateless coding scheme for data transmission in deep space networks

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Science China(Information Sciences) 2018年第4期61卷 87-96页

作者： Shuang WU dezhi li Zhenyong WANG Qing GUO School of Electronics and Information Engineering Harbin Institute of Technology Shenzhen Academy of Aerospace Technology

In deep space data transmission systems, deep space networks can be constructed on different orbits, and the data from each orbit are always associated with the different reliability requirements. In this study, a novel UEP(unequal error protection) transmission scheme based on distributed LT codes is proposed in order to ensure that all the data can be transmitted according to their own reliability requirements and obtain high transmission efficiency property. In the proposed scheme, the sub-codes on each node(orbits) were performed by a classic LT encoding process. By assigning different degree distributions to the sub-codes, all types of data can be transmitted with better transmission efficiency in comparison to the traditional scheme,and can be recovered at the destination with their own reliability requirements. Moreover, the design of the proposed scheme is much easier than that of the traditional scheme, and is also suitable to the strictly limited processing capacity property of deep space networks. By carrying out asymptotic analysis on the proposed scheme, and by obtaining the numerical and simulation results, it can be seen that the proposed scheme can approximately achieve the same UEP property and much better transmission efficiency than the traditional scheme. Additionally, the results demonstrate that the proposed scheme is much more suitable to deep space network data transmission, in comparison to the traditional scheme.

关键词： deep space networks distributed rateless codes UEP encoding overhead asymptotic analysis design complexity

State-of-health estimation of lithium-ion batteries based on electrochemical impedance spectroscopy: a review

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Protection and Control of Modern Power Systems 2023年第3期8卷 63-79页

作者： Yanshuo liu licheng Wang dezhi li Kai Wang School of Electrical Engineering Weihai Innovation Research InstituteQingdao UniversityQingdao 266000China School of Information Engineering Zhejiang University of TechnologyHangzhou 310014China

lithium-ion batteries(liBs)are crucial for the large-scale utilization of clean ***,because of the com-plexity and real-time nature of internal reactions,the mechanism of capacity decline in liBs is still *** has become a bottleneck restricting their promotion and *** impedance spectroscopy(EIS)contains rich electrochemical connotations and significant application prospects,and has attracted widespread atten-tion and research on efficient energy storage *** to traditional voltage and current data,the state-of-health(SOH)estimation model based on EIS has higher *** paper categorizes EIS measurement methods based on different principles,introduces the relationship between liBs aging mechanism and SOH,and compares the advantages of different SOH estimation *** a detailed analysis of the latest technologies,a review is *** insights of this review can deepen the understanding of the relationship between EIS and the aging effect mechanism of liBs,and promote the development of new energy storage devices and evaluation methods.

关键词： lithium-ion batteries State-of-health Electrochemical impedance spectroscopy SOH estimation Battery management system

Double Peak Derived from Piezoelectric Coefficient Nonlinearity and Proposal for Self-Powered Systems

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第1期35卷 109-115页

作者： Zhang Bin li dezhi li Yingrui Ducharne Benjamin Gao Jun School of Mechanical Electrical & InformationShandong University School of Mechatronics Engineering Harbin Institute of Technology Laboratoire de Génie Electrique et Ferroélectricité(LGEF) INSA de Lyon

With the development of wireless sensor network(WSN)applications in intelligent monitoring,additional support for the low power consumption wireless nodes can be provided by piezoceramics that harvest vibrational ***,we describe the effects of stimulation variations on piezoceramics and the energy harvesting circuit *** types of piezoceramics were stimulated at different frequencies and amplitudes to obtain the power output ***,the energy harvesting circuit was studied and coupled with the piezoceramics.A double peak phenomenon was found in energy harvesting using a hard piezoceramic which gave a direct proof that the nonlinearity of the piezo constant should be considered in ***,energy storage and output were studied and *** components for the WSN were recommended according to the output power and the *** results will give an instruction for piezoceramic energy harvesting under various stress amplitudes on its implementation.

关键词： piezoelectric energy harvesting self-powered system energy harvesting circuit output optimization

N-terminal residues of an HIV-1 gp41 membrane-proximal external region antigen influence broadly neutralizing 2F5-like antibodies

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Virologica Sinica 2015年第6期30卷 449-456页

作者： dezhi li Jie liu li Zhang Tianshu Xu Junheng Chen liping Wang Qi Zhao School of life Sciences Xiamen University Laboratory of Fully Human Antibody Engineering Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences School of life Sciences Jilin University Faculty of Health Sciences University of Macao

The Human immunodeficiency virus type 1(HIV-1) gp41 membrane proximal external region(MPER) is targeted by broadly neutralizing antibodies(e.g. 2F5, 4E10, Z13 e and m66.6), which makes this region a promising target for vaccine design. One strategy to elicit neutralizing antibodies against the MPER epitope is to design peptide immunogens mimicking neutralization structures. To probe 2F5-like neutralizing antibodies, two yeast-displayed antibody libraries from peripheral blood mononuclear cells from a HIV-1 patient were screened against the 2F5 epitope peptide SP62. Two 2F5-like antibodies were identified that specifically recognized SP62. However,these antibodies only weakly neutralized HIV-1 primary isolates. The epitopes recognized by these two 2F5-like antibodies include not only the 2F5 epitope(amino acids(aa) 662–667 in the MPER)but also several other residues(aa 652–655) locating at the N-terminus in SP62. Experimental results suggest that residues of SP62 adjacent to the 2F5 epitope influence the response of broadly neutralizing 2F5-like antibodies in vaccination. Our findings may aid the design of vaccine immunogens and development of therapeutics against HIV-1 infection.

关键词： HIV-1 membrane proximal external region(MPER) 2F5 neutralizing antibody yeast display

Future evolution of automated demand response system in smart grid for low-carbon economy

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Journal of Modern Power Systems and Clean Energy 2015年第1期3卷 72-81页

作者： Huaguang YAN Bin li Songsong CHEN Ming ZHONG dezhi li limin JIANG Guixiong HE China Electric Power Research Institute Beijing 100192China School of Electric and Electronic Engineering North China Electric Power UniversityBeijing 102206China

Smart grid construction is an important carrier and an effective way to promote the development of lowcarbon *** response(DR)is commonly regarded as an important core technology in smart grid field,and it reflects the flexible and interactive features of the core business in smart *** is the developing direction of automated demand response(ADR)technology,and its main features are the standardization of information exchange,together with the intelligence of decision-making and the automation of *** technology can improve the efficiency of the whole power system and enhance the ability to accept new energy *** paper analyzes the role of demand response in improving efficiency and low-carbon energy saving power *** automated demand response system architecture is investigated,and the ADR roadmap of commercial/industrial and residential customer is *** key technologies for ADR system are analyzed,including demand response strategy,information exchanging model,measurement and verification techniques,and multi-agent scheduling *** ensure the interoperability between the grid side and the user side,the ADR business in smart grid user interface standards is concluded to support further demand side management project.

关键词： Demand response Information model System architecture Load shifting

Design of a low-filling-factor and polarization-sensitive superconducting nanowire single photon detector with high detection efficiency

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Photonics Research 2019年第8期7卷 847-852页

作者： dezhi li RONGZHEN JIAO School of Science Beijing University of Posts and TelecommunicationsBeijing100876China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing100876China

We designed a low-filling-factor and polarization-sensitive superconducting nanowire single photon detector(SNSPD), which can achieve a high absorption efficiency and counting rate simultaneously. Numerical simulations show that high absorption efficiency can be achieved by low-filling-factor SNSPDs with a silicon slot and silver reflector. The absorptance of the NbN nanowire for a transverse magnetic(TM) wave at the wavelength of 1550 nm can be 84.4% when the filling factor is only 16.5%, and the corresponding polarization extinction ratio(PER) is 562.9;the absorptance of the NbN nanowire for a transverse electric(TE) wave can be 67.0% when the filling factor is only 11.7%, and the PER is 7.4.

关键词： NbN PER low-filling-factor

The Performance Analysis for Distributed Collaborative Beamforming Transmission of Clustered Mobile Sensor Network

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Journal of Harbin Institute of Technology(New Series) 2016年第4期23卷 8-14页

作者： Fangyuan Yu dezhi li Qing Guo Bo Zeng Zhenyong Wang Communication Research Center Harbin Institute of Technology

Sensor nodes cannot directly communicate with the distant unmanned aerial vehicle( UAV) for their low transmission power. Distributed collaborative beamforming from sensor nodes within a cluster is proposed to provide high speed data transmission to the distant UAV. The bit error ratio( BER) closed-form expression of distributed collaborative beamforming transmission with mobile sensor nodes has been derived. Furthermore,based on the theoretical BER analysis and the numerical results,we have analyzed the impacts of nodes 'mobility,number of sensor nodes,transmission power and the elevation angle of UAV on the BER performance of collaborative beamforming. And we come to the following conclusions: the mobility of sensor nodes largely decreases the BER performance; when the position deviation radius is large,incensement in power cannot improve BER anymore; the size of cluster should be bigger than 10 for the purpose of achieving good BER performance in Rayleigh fading channel.

关键词： clustered sensor network collaborative beamforming mobile nodes unmanned aerial vehicle BER

Rolling Bearing Fault Diagnosis Based On Convolutional Capsule Network

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Journal of Dynamics, Monitoring and Diagnostics 2023年第4期2卷 275-289页

作者： Guangjun Jiang dezhi li Ke Feng Yongbo li Jinde Zheng Qing Ni He li School of Mechanical Engineering Inner Mongolia University of TechnologyHohhotInner MongoliaChina Inner Mongolia Key Laboratory of Advanced Manufacturing Technology HohhotInner MongoliaChin a 3 Department of Industrial Systems Engineering and Management National University of Singapore117576Singapore School of Aeronautics Northwestern Polytechnical UniversityXi’an 710068China School of Mechanical Engineering Anhui University of TechnologyMa’anshan 243002China School of Mechanical and Mechatronic Engineering University of Technology SydneyUltimoNSW 2007Australia Centre for Marine Technology and Ocean Engineering(CENTEC) Instituto Superior TécnicoUniversidade de LisboaLisbonPortugal

Fault diagnosis technology has been widely applied and is an important part of ensuring the safe operation of mechanical *** response to the problem of frequent faults in rolling bearings,this paper designs a rolling bearing fault diagnosis method based on convolutional capsule network(CCN).More specifically,the original vibration signal is converted into a two-dimensional time–frequency image using continuous wavelet transform(CWT),and the feature extraction is performed on the two-dimensional time–frequency image using the convolution layer at the front end of the network,and the extracted features are input into the capsule *** capsule network converts the extracted features into vector neurons,and the dynamic routing algorithm is used to achieve feature transfer and output the results of fault *** different datasets are used to compare with other traditional deep learning models to verify the fault diagnosis capability of the *** results show that the CCN has good diagnostic capability under different working conditions,even in the presence of noise and insufficient samples,compared to other *** method contributes to the safe and reliable operation of mechanical equipment and is suitable for other rotating scenarios.

关键词： continuous wavelet transform convolutional capsule network fault diagnosis rolling bearings

Complete genome sequence of methicillin-sensitive Staphylococcus aureus containing a heterogeneic staphylococcal cassette chromosome element

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Science China(life Sciences) 2013年第3期56卷 268-274页

作者： li dezhi CHU YaNan REN LuFeng li XinGang YUAN lina KANG Yu ZHANG Wei YANG Yu WANG XuMin BAILliE J.Kenneth YU Jun GAO ZhanCheng Department of Respiratory and Critical Care Medicine Peking University People's Hospital Department of Respiratory Medicine Shandong Provincial HospitalShandong University CAS Key Laboratory of Genome Sciences and Information Beijing Institute of GenomicsChinese Academy of Sciences The DNA Sequencing Technologies R&D Center Beijing Institute of GenomicsChinese Academy of Sciences Department of Respiratory Medicine First Affiliated Hospital of Nanchang University Chinese Academy of Inspection and Quarantine Division of Genetics and Genomics The Roslin InstituteUniversity of EdinburghRoslinEH25 9RGUK Department of Critical Care Medicine University of EdinburghEdinburghEH16 4TJUK

Staphylococcus aureus is a common human bacterium that sometimes becomes pathogenic,causing serious infections.A key feature of *** is its ability to acquire resistance to *** presence of the staphylococcal cassette chromosome(SCC) element in serotypes of *** has been confirmed using multiplex PCR *** SCC element is the only vector known to carry the mecA gene,which encodes methicillin resistance in *** ***,we report the genome sequence of a novel methicillin-sensitive ***(MSSA) strain:SCC-like *** strain was originally erroneously serotyped as methicillin-resistant *** in a clinical laboratory using multiplex PCR *** sequenced the genome of SCC-like MSSA463 using pyrosequencing techniques and compared it with known genome sequences of other *** *** open reading frame(CZ049;AB037671) was identified downstream of attL and attR inverted repeat *** results suggest that a lateral gene transfer occurred between *** and other organisms,partially changing *** *** propose that attL and attR inverted repeats in *** serve as frequent insertion sites for exogenous genes.

关键词： Staphylococcus aureus staphylococcal cassette chromosome mec (SCC-mec) genomics pyrosequeneing