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Three-dimensional cooperative guidance strategy and guidance law for intercepting highly maneuvering target

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Chinese Journal of Aeronautics 2021年第5期34卷 485-495页

作者： ziyan chen Jianglong YU Xiwang DONG Zhang REN School of Automation Science and Electrical Engineering Science and Technology on Aircraft Control LaboratoryBeihang UniversityBeijing 100191China Beijing Advanced Innovation Center for Big Data cmd Brain Computing Beihang UniversityBeijing 100191China

Cooperative interception of the target with strong maneuverability by multiple missiles with weak maneuverability in the three-dimensional nonlinear model is ***,the three-dimensional nonlinear model of cooperative guidance is *** three-dimensional reachable region is represented composed of lateral acceleration and longitudinal acceleration in the two-dimensional coordinate ***,the problem of the multiple missile’s reachable coverage area is transformed into the problem of cooperative coverage.A cooperative coverage strategy is proposed and an algorithm for quickly calculating the number of required missiles is ***,the guidance law based on the cooperative coverage strategy is proposed,and it is proved that cooperative interception of the target can be achieved under the acceleration ***,the relations among the number of missiles,the initial array position of terminal guidance and the coverage area of the target’s large maneuver are *** dynamic adjustment strategy of guidance parameters is proposed to reduce the guidance ***,simulation results show that multiple missiles with low maneuverability can achieve effective interception of target with strong maneuverability through the proposed cooperative strategy and cooperative guidance method.

关键词： Acceleration constraint Cooperative interception Coverage strategy Guidance law Highly maneuvering target

A personalized electronic textile for ultrasensitive pressure sensing enabled by biocompatible MXene/ PEDOT:PSS composite

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Carbon Energy 2024年第3期6卷 224-238页

作者： Yahua Li Wentao Cao Zhi Liu Yue Zhang ziyan chen Xianhong Zheng Department of Interventional Radiology The First Affiliated Hospital of Zhengzhou UniversityZhengzhouHenanChina School of Textile and Garment Anhui Polytechnic UniversityWuhuAnhuiChina Department of Prosthodontics Shanghai Stomatological Hospital and School of StomatologyFudan UniversityShanghaiChina College of Chemistry Chemical Engineering and BiotechnologyDonghua UniversityShanghaiChina

Flexible,breathable,and highly sensitive pressure sensors have increasingly become a focal point of interest due to their pivotal role in healthcare monitoring,advanced electronic skin applications,and disease ***,traditional methods,involving elastomer film-based substrates or encapsulation techniques,often fall short due to mechanical mismatches,discomfort,lack of breathability,and limitations in sensing ***,there is a pressing need,yet it remains a significant challenge to create pressure sensors that are not only highly breathable,flexible,and comfortable but also sensitive,durable,and ***,we present a biocompatible and breathable fabric-based pressure sensor,using nonwoven fabrics as both the sensing electrode(coated with MXene/poly(3,4-ethylenedioxythiophene):polystyrene sulfonate[PEDOT:PSS])and the interdigitated electrode(printed with MXene pattern)via a scalable spray-coating and screen-coating *** resultant device exhibits commendable air permeability,biocompatibility,and pressure sensing performance,including a remarkable sensitivity(754.5 kPa^(−1)),rapid response/recovery time(180/110 ms),and robust cycling ***,the integration of PEDOT:PSS plays a crucial role in protecting the MXene nanosheets from oxidation,significantly enhancing the device's long-term *** outstanding features make this sensor highly suitable for applications in fullrange human activities detection and disease *** study underscores the promising future of flexible pressure sensors in the realm of intelligent wearable electronics,setting a new benchmark for the industry.

关键词： biocompatibility MXene pressure sensor screen printing textile

Adsorption behavior of phosphate on Lanthanum(Ⅲ) doped mesoporous silicates material

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Journal of Environmental Sciences 2010年第4期22卷 507-511页

作者： Jianda Zhang Zhemin Shen Wenpo Shan ziyan chen Zhijian Mei Yangming Lei Wenhua Wang School of Environmental Science and Engineering Shanghai Jiaotong University Shanghai 200240 China College of Chemistry and Environmental Science Hebei University Baoding 071002 China College of Life and Environmental Sciences Shanghai Normal University Shanghai 200234 China

A series of lanthanum doped meosoporous MCM-41 （LaxM41, x is Si/La molar ratio） was prepared by sol-gel method. The surface structure of the materials was investigated with X-ray diffraction and N2 adsorption/desorption technique. The content of La in the materials was determined by ICE It was found that the La content of La25M41, La50M41 and La100M41 was 7.53%, 3.89% and 2.32%, respectively. The phosphate adsorption capacities increased with increasing amount of La incorporation. With 0.40 g La25M41 99.7% phosphate could be removed. The effects of Si/La molar ratio, LaxM41 dose, pH, initial concentration of phosphate solution, co-ions on phosphate adsorption were also evaluated. The phosphate adsorption kinetics of LaxM41 could be well-described by the pseudo second-order model, and Langmuir isotherm fit equilibrium data much better than the Freundlich isotherm.

关键词： lanthanum doped mesoporous material phosphate adsorption eutrophication

Analysis of emotional integration in Photojournalism

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Analysis of emotional integration in Photojournalism

BURST-LDA: A NEW TOPIC MODEL FOR DETECTING BURSTY TOPICS FROM STREAM TEXT

作者： ziyan chen Fine Arts School Hangzhou Normal University

News photography is a news photography that covers social features and social dynamics, analyzes and studies social issues, and explores social psychology. Integrating emotional factors into photography is an important requirement for contemporary news photography. This article analyzes the significance of emotional factors for news photography, and puts forward the emotional factors and requirements and specific methods for incorporating them into news photography.

关键词： News photography Fusion Emotional factors

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Journal of Electronics(China) 2014年第6期31卷 565-575页

作者： Qi Xiang Huang Yu chen ziyan Liu Xiaoyan Tian Jing Huang Tinglei Wang Hongqi Key Laboratory of Technology in Geo-spatial Information Processing and Application System Institute of Electronics Chinese Academy of Sciences University of Chinese Academy of Sciences

Topic models such as Latent Dirichlet Allocation(LDA) have been successfully applied to many text mining tasks for extracting topics embedded in corpora. However, existing topic models generally cannot discover bursty topics that experience a sudden increase during a period of time. In this paper, we propose a new topic model named Burst-LDA, which simultaneously discovers topics and reveals their burstiness through explicitly modeling each topic's burst states with a first order Markov chain and using the chain to generate the topic proportion of documents in a Logistic Normal fashion. A Gibbs sampling algorithm is developed for the posterior inference of the proposed model. Experimental results on a news data set show our model can efficiently discover bursty topics, outperforming the state-of-the-art method.

关键词： Text mining Burst detection Topic model Graphical model Bayesian inference

TPOS Tagging Method Based on BiLSTM_CRF Model

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国际计算机前沿大会会议论文集 2019年第1期 501-503页

作者： Lili Wang ziyan chen Hongwu Yang College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070 China Engineering Research Center of Gansu Province for Intelligent Information Technology and Application Lanzhou 730070 China National and Provincial Joint Engineering Laboratory of Learning Analysis Technology in Online Education Lanzhou 730070 China

Part of speech (POS) tagging determines the attributes of each word, and it is the fundamental work in machine translation, speech recognition, information retrieval and other fields. For Tibetan part-of-speech (TPOS) tagging, a tagging method is proposed based on bidirectional long short-term memory with conditional random field model (BiLSTM_CRF). Firstly, the designed TOPS tagging set and manual tagging corpus were used to get word vectors by embedding Tibetan words and corresponding TPOS tags in continuous bag-of-words (CBOW) model. Secondly, the word vectors were input into the BiLSTM_CRF model. To obtain the predictive score matrix, this model using the past input features and future input feature information respectively learned by forward long short-term memory (LSTM) and backward LSTM performs non-linear operations on the softmax layer. The prediction score matrix was input into the CRF model to judge the threshold value and calculate the sequence score error. Lastly, a Tibetan part of speech tagging model was got based on the BiLSTM_CRF model. The experimental results indicate that the accuracy of TPOS tagging model based on the BiLSTM_CRF model can reach 92.7%.

关键词： Deep learning Word embedding model Tibetan part-of-speech

A piezoelectric-driven microneedle platform for skin disease therapy

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The Innovation 2024年第3期5卷 110-121页

作者： ziyan chen Xin Liu Zixi Jiang Huayi Wu Tao Yang Lanyuan Peng Lisha Wu Zhongling Luo Mi Zhang Juan Su Yan Tang Jinmao Li Yang Xie Han Shan Qibo Lin Xiuli Wang Xiang chen Hanmin Peng Shuang Zhao Zeyu chen Department of Dermatology Xiangya HospitalCentral South UniversityChangsha 410008China Furong Laboratory(Precision Medicine) Changsha 410008China National Engineering Research Center of Personalized Diagnostic and Therapeutic Technology Xiangya HospitalCentral South UniversityChangsha 410008China Hunan Engineering Research Center of Skin Health and Disease Xiangya HospitalCentral South UniversityChangsha 410008China Hunan Key Laboratory of Skin Cancer and Psoriasis Xiangya HospitalCentral South UniversityChangsha 410008China National Clinical Research Center of Geriatric Disorders Xiangya HospitalCentral South UniversityChangsha 410008China School of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China Department of Dermatology Xijing HospitalThe Fourth Military Medical UniversityXi’anShaanxi 710000China State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics&AstronauticsNanjing 210016China Institute of Photomedicine Shanghai Skin Disease HospitalSchool of MedicineTongji UniversityShanghai 200443China

With over a million cases detected each year,skin disease is a global public health problem that diminishes the quality of life due to its difficulty to eradicate,propensity for recurrence,and potential for post-treatment *** therapy(PDT)is a treatment with minimal invasiveness or scarring and few side effects,making it well tolerated by ***,this treatment requires further research and development to improve its effective clinical ***,a piezoelectric-driven microneedle(PDMN)platform that achieves high efficiency,safety,and non-invasiveness for enhanced PDT is *** platform induces deep tissue cavitation,increasing the level of protoporphyrin IX and significantly enhancing drug penetration.A clinical trial involving 25 patients with skin disease was conducted to investigate the timeliness and efficacy of PDMN-assisted PDT(PDMN-PDT).Our findings suggested that PDMN-PDT boosted treatment effectiveness and reduced the required incubation time and drug concentration by 25%and 50%,respectively,without any anesthesia compared to traditional *** findings suggest that PDMN-PDT is a safe and minimally invasive approach for skin disease treatment,which may improve the therapeutic efficacy of topical medications and enable translation for future clinical applications.

关键词： needle anesthesia clinical

Is the Demographic Dividend Diminishing in China?——Evidence from Population Aging and Economic Development during 1990-2015

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Is the Demographic Dividend Diminishing in China?——Evidenc...

Construction of 3D porous Cu_(1.81)S/nitrogen-doped carbon frameworks for ultrafast and long-cycle life sodium-ion storage

中国经济发展：改革开放40年与新时代——第十二届中华发展经济学年会

作者：叶巾祁 ziyan chen Bin Peng

This paper presents new empirical evidence on the effect of Chinese population aging on economic *** degree of aging is widely assumed to impact economic growth by shaping the labor market and human *** exploit the predicted province-by-year variation in population aging as an instrument to estimate the impact of aging growth on province

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 191-200页

作者： chen chen Hongyu Xue Qilin Hu Mengfan Wang Pan Shang ziyan Liu Tao Peng Deyang Zhang Yongsong Luo Key Laboratory of Microelectronics and Energy of Henan Province Henan Joint International Research Laboratory of New Energy Storage TechnologyCollege of Physics and Electronic EngineeringXinyang Normal UniversityXinyang 464000China School of Physics and Electronic Engineering Nanyang Normal UniversityNanyang 473061China

Transition metal sulfides have great potential as anode mterials for sodium-ion batteries(SIBs)due to their high theoretical specific ***,the inferior intrinsic conductivity and large volume variation during sodiation-desodiation processes seriously affect its high-rate and long-cyde performance,unbeneficial for the application as fast-charging and long-cycling SIBs ***,the three-dimensional porous Cu_(1.81)S/nitrogen-doped carbon frameworks(Cu_(1.81)S/NC)are synthesized by the simple and facile sol-gel and annealing processes,which can accommodate the volumetric expansion of Cu_(1.81)S nanoparticles and accelerate the transmission of ions and electrons during Na^(+)insertion/extraction processes,exhibiting the excellent rate capability(250.6 mA·g^(-1)at 20.0 A·g^(-1))and outstanding cycling stability(70% capacity retention for 6000 cycles at 10.0 A·g^(-1))for ***,the Na-ion full cells coupled with Na_(3)V_(2)(PO_(4))_(3)/C cathode also demonstrate the satisfactory reversible specific capacity of 330.5 mAh·g^(-1)at 5.0 A·g^(-1)and long-cycle performance with the 86.9% capacity retention at 2.0 A·g^(-1)after 750 *** work proposes a promising way for the conversionbased metal sulfides for the applications as fast-charging sodium-ion battery anode.

关键词： copper sulfide nanoparticles porous carbon framework fast charging long-cycle performance sodium-ion full batteries