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Consensus Analysis of Fractional Multi-Agent Systems with Delayed Distributed PI Controller

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Journal of Systems Science & Complexity 2023年第1期36卷 205-221页

作者： XIE Yingkang ma qian School of Automation Nanjing University of Science and TechnologyNanjing 210094China

The consensus problem for fractional multi-agent systems(maSs)with time delay is *** distributed fractional proportional-integral(PI)-type controller is designed so that the consensus of the proposed systems is ***,explicit condition to determine the crossing directions is *** results show that with the increase of time delay,the closed-loop system has two different dynamic characteristics:From consensus to nonconsensus and consensus ***,delay margin within which consensus of maSs will always hold is *** results should provide useful guidelines in the consensus analysis and in the analytical design of the distributed controllers.

关键词： Consensus switching crossing direction fractional multi-agent systems fractional PI controller time delay

Metamaterial-assisted illumination nanoscopy

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National Science Review 2018年第2期5卷 141-143页

作者： qian ma Zhaowei Liu Department of Electrical and Computer Engineering University of California San Diego

Traditional optical microscopy resolves fine details of the microscopic worlds,but has its resolution limited by the wave nature of *** to the Abbe diffraction limit d=λ/2NA,whereλand NA represent the light waveleng...

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Spatial Distribution Pattern and Influencing Factors of Bed-and-breakfasts(B&Bs)from the Perspective of Urban-rural Differences:A Case Study of Jiaodong Peninsula,China

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Chinese Geographical Science 2024年第4期34卷 752-763页

作者： WANG Xinyue ma qian management College Ocean University of ChinaQingdao 266100China

There are significant differences between urban and rural bed-and-breakfasts(B&Bs)in terms of customer positioning,economic strength and spatial *** identifying the differences in spatial characteristics and influencing factors of each type,is essential for creating urban and rural B&B agglomeration *** study used density-based spatial clustering of applications with noise(DBSCAN)and the multi-scale geographically weighted regression(MGWR)model to explore similarities and differences in the spatial distribution patterns and influencing factors for urban and rural B&Bs on the Jiaodong Peninsula of China from 2010 to *** results showed that:1)both urban and rural B&Bs in Jiaodong Peninsula went through three stages:a slow start from 2010 to 2015,rapid development from 2015 to 2019,and hindered development from 2019 to ***,urban B&Bs demonstrated a higher development speed and agglomeration intensity,leading to an increasingly evident trend of uneven development between the two sectors.2)The clustering scale of both urban and rural B&Bs continued to expand in terms of quantity and *** B&B clusters characterized by a limited number,but a higher likelihood of transitioning from low-level to high-level *** the number of rural B&B clusters steadily increased over time,their clustering scale was comparatively lower than that of urban B&Bs,and they lacked the presence of high-level clustering.3)In terms of development direction,urban B&B clusters exhibited a relatively stable pattern and evolved into high-level clustering centers within the main urban ***,rural B&Bs exhibited a more pronounced spatial diffusion effect,with clusters showing a trend of multi-center development along the coastline.4)Transport emerged as a common influencing factor for both urban and rural B&Bs,with the density of road network having the strongest explanatory power for their spatial *** terms of differences,populati

关键词： urban-rural bed-and-breakfasts(B&Bs) spatiotemporal evolution density-based spatial clustering of applications with noise(DBSCAN)model multi-scale geographically weighted regression(MGWR) Jiaodong Peninsula China

Model optimization method and connected-pipe experiment of a liquid fuel ramjet engine

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航空动力学报 2013年第6期28卷 1277-1285页

作者： ma qian-rong GUO Xin WU Hu CHOU qian School of Power and Energy Northwest Polytechnical University Aero-Engine Altitude Simulated Key Laboratory China Gas Turbine EstablishmentAviation Industry Corporation of China

The optimization method of a mathematical model and connected-pipe experimental technique for a test in altitude test facility (ATF) of a liquid fuel ramjet engine was *** optimization of the simple mathematical model was divided into two ***,using the test engine's geometry configuration size data,a preliminary adjustment was ***,using experimental test data,the components' experiential coefficients were modified *** was laid on the simulation technique of flight condition and parameters measurement *** experimental technique was applied to a ramjet ATF test *** comparison results show that the optimized-model has higher precision and the nozzle gross thrust difference drops from 12% to about 4%.

关键词： ramjet engine model optimization altitude test facility(ATF) connected-pipe experiment simulation technique

Effectiveness of co-treatment with traditional Chinese medicine and letrozole for polycystic ovary syndrome:a meta-analysis

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Journal of Integrative Medicine 2017年第2期15卷 95-101页

作者： qian-wen ma Yong Tan The First Clinical Medical College Nanjing University of Chinese Medicine Department of Gynecology Zhenjiang Hospital of Traditional Chinese Medicine

BACKGROUND： Polycystic ovary syndrome （PCOS） is an endocrine disease that affects gynecologica health. Treatment of PCOS remains a big challenge for clinicians. OBJECTIVE： This meta-analysis was developed to compare the efficacy of co-treatment with traditiona Chinese medicine （TCM） and letrozole against letrozole monotherapy in the treatment of PCOS. SEARCH STRATEGY： Randomized controlled trials （RCTs） were electronically retrieved from PubMed, Cochrane Library, China Biomedical Literature Database, China National Knowledge Infrastructure and Wanfang Data; related papers that were not available electronically were manually checked. All papers were assessed according to the Cochrane Handbook for Systematic Reviews of Interventions and the valid data were analyzed using Revman software （The Cochrane Collaboration, Copenhagen, Denmark） INCLUSION CRITERIA： We included RCTs that compared co-treatment with TCM and letrozole against letrozole monotherapy in women with PCOS, which was defined by anovulation, biochemical or clinical hyperandrogenemia and polycystic ovaries. We included trials from all sources. DATA EXTRACTION AND ANALYSIS： Two independent reviewers extracted data, and evaluated study quality according to the Cochrane Handbook for Systematic Reviews of Interventions criteria for RCT, including issues of patient randomization, blinding and bias. RESULTS： Eight RCTs, involving a total of 537 patients, were included in the present study. The meta-analysis showed that the cycle ovulation rate, the pregnancy rate and the total effective rate of symptom treatment were higher in treatments combining TCM with letrozole, compared with letrozole monotherapy. Although the rate of luteinizing hormone （LH）/follicle-stimulating hormone （FSH） and the body mass index of the group receiving combined therapy were lower than in letrozole monotherapy, no statistical difference was found in the LH and FSH level between the two groups. CONCLUSION： Available evidence showed that c

关键词： medicine, Chinese traditional letrozole polycystic ovary syndrome meta-analysis

Further Results on Stability Analysis for Sampled-Data Systems via Refined Semi-Looped-Functional

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Journal of Systems Science & Complexity 2024年第1期37卷 318-328页

作者： SHENG Zhaoliang XU Shengyuan ma qian ZHANG Baoyong School of Automation Nanjing University of Science and TechnologyNanjing 210094China

This paper investigates the stability problem for sampled-data systems by adopting a refined semi-looped-functional,which is with the following two ***,the new functional term is with a new integral vectorη0,which contains sampling information of the systems and associates two commonly used ***,the vectorη0 is combined into various zero equations for processing the functional,especially where a new equation is derived fromη*** on the refined functional,further stability results for sampled-data systems are *** the effectiveness of the results is numerically verified through two examples at the end.

关键词： Integral vector sampled-data systems semi-looped-functional stability analysis.

A model for knowledge transfer in a multi-agent organization based on lattice kinetic model

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Journal of Systems Engineering and Electronics 2020年第1期31卷 156-167页

作者： WU Weiwei ma qian LIU Yexin KIM Yongjun School of management Harbin Institute of TechnologyHarbin 150001China School of Economics and management Harbin Institute of Technology at WeihaiWeihai 264209China Beijing Institute of Aerospace Information Beijing 100854China

A study on knowledge transfer in a mutli-agent organization is performed by applying the basic principle in physics such as the kinetic *** on the theoretical analysis of the knowledge accumulation process and knowledge transfer attributes,a special type of knowledge field(KF)is introduced and the knowledge diffusion equation(KDE)is *** evolution of knowledge potential is modeled by lattice kinetic equation and verified by numerical *** new equation-based modeling developed in this paper is meaningful to simulate and predict the knowledge transfer process in *** development of the lattice kinetic model(LKM)for knowledge transfer can contribute to the knowledge management theory,and the managers can also simulate the knowledge accumulation process by using the LKM.

关键词： knowledge transfer multi-agent system knowledge field(KF) lattice kinetic model(LKM) knowledge diffusion equation(KDE)

Guaranteed Cost Attitude Tracking Control for Uncertain Quadrotor Unmanned Aerial Vehicle Under Safety Constraints

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IEEE/CAA Journal of Automatica Sinica 2024年第6期11卷 1447-1457页

作者： qian ma Peng Jin Frank L.Lewis School of Automation Nanjing University of Science and TechnologyNanjing 210094China UTA Research Institute University of Texas at ArlingtonFort WorthTexas 76118 USA IEEE

In this paper,guaranteed cost attitude tracking con-trol for uncertain quadrotor unmanned aerial vehicle(QUAV)under safety constraints is ***,an augmented system is constructed by the tracking error system and reference *** transformation aims to convert the tracking control prob-lem into a stabilization control ***,control barrier function and disturbance attenuation function are designed to characterize the violations of safety constraints and tolerance of uncertain disturbances,and they are incorporated into the reward function as penalty *** on the modified reward function,the problem is simplified as the optimal regulation problem of the nominal augmented system,and a new Hamilton-Jacobi-Bellman equation is ***,critic-only rein-forcement learning algorithm with a concurrent learning tech-nique is employed to solve the Hamilton-Jacobi-Bellman equa-tion and obtain the optimal *** proposed algorithm can not only ensure the reward function within an upper bound in the presence of uncertain disturbances,but also enforce safety *** performance of the algorithm is evaluated by the numerical simulation.

关键词： Attitude tracking control quadrotor unmanned aerial vehicle(QUAV) reinforcement learning safety constraints uncertain disturbances.

A Posture Recognition System for Rat Cyborg Automated Navigation

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Chinese Journal of Electronics 2018年第4期27卷 687-693页

作者： ZHANG Zhenchuan YANG Yingchun WU Zhaohui ma qian College of Computer Science and Technology Zhejiang University College of Computer Science and Technology Qiushi Academy for Advanced Studies Zhejiang University

Rat cyborg is a rat which can receive cerebral commands and act as human wants. The navigation task is a widely used scenario in which the rat cyborg is required to walk along a specified path according to commands. Mostly the commands are given by human operators, but there’s a need for automatic control which is quite challenging since several modules need to be elaborately combined together to work as a whole, among which the monitoring system and the commands model are two major components. Previously, few attempts were made for behavior monitoring of rat cyborg. Existing works often implement an over-simple rat information extractor which is capable of giving only a few parameters of the rat cyborg, which greatly limited the performance of their automatic control accuracy. In response to this requirement,we develop a monitoring system that is capable of giving detailed motion parameters and accurate body postures of the rat cyborg. We explore the possibility of recognizing rat postures using shape information, which is described by the powerful Zernike moments. We propose several simple shape descriptors which are fast to compute and achieve acceptable performance.

关键词： Rat cyborg Posture recognition Rat posture