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| 1 | Coordinated flight control of miniature fixed-wing UAV swarms: methods and experiments显示文摘In this paper,we present our recent advances in both theoretical methods and field experiments for the coordinated control of miniature fixed-wing unmanned aerial vehicle(UAV)swarms.We propose a multi-layered group-based architecture,which is modularized,mission-oriented,and can implement large-scale swarms.To accomplish the desired coordinated formation flight,we present a novel distributed coordinated-control scheme comprising a consensus-based circling rendezvous,a coordinated path-following control for the leader UAVs,and a leader-follower coordinated control for the follower UAVs.The current framework embeds a formation pattern reconfiguration technique.Moreover,we discuss two security solutions(inter-UAV collision avoidance and obstacle avoidance)in the swarm flight problem.The effectiveness of the proposed coordinated control methods was demonstrated in field experiments by deploying up to 21 fixed-wing UAVs. | Xiangke WANG Lincheng SHEN Zhihong LIU Shulong ZHAO Yirui CONG Zhongkui LI Shengde JIA Hao CHEN Yangguan YU Yuan CHANG Yajing WANG | 2019 | Science China(Information Sciences)2019，62，11： | 21 |
| 2 | Multi-Objective Particle Swarm Optimization(MOPSO) for a Distributed Energy System Integrated with Energy Storage显示文摘Distributed energy systems are considered as a promising technology for sustainable development and have become a popular research topic in the areas of building energy systems. This work presents a case study of optimizing an integrated distributed energy system consisting of combined heat and power(CHP), photovoltaics(PV), and electric and/or thermal energy storage for a hospital and large hotel buildings located in Texas and California. First, simulation models for all subsystems, which are developed individually, are integrated together according to a control strategy designed to satisfy both the electric and thermal energy requirements of a building. Subsequently, a multi-objective particle swarm optimization(MOPSO) is employed to obtain an optimal design of each subsystem. The objectives of the optimization are to minimize the simple payback period(PBP) and maximize the reduction of carbon dioxide emissions(RCDE). Finally, the energy performance for the selected building types and locations are analyzed after the optimization. Results indicate that the proposed optimization method could be applied to determine an optimal design of distributed energy systems, which reaches a trade-off between the economic and environmental performance for different buildings. With the presented distributed energy system, a peak shaving in electricity of about 300 kW and a reduction in boiler fuel consumption of 610 kW could be attained for the hospital building located in California for a winter day. For the summer and transition seasons, electricity peak shaving of 800 kW and 600 kW could be achieved, respectively. | ZHANG Jian CHO Heejin MAGO Pedro J. ZHANG Hongguang YANG Fubin | 2019 | Journal of Thermal Science2019，28，6： | 11 |
| 3 | Recent Advances in Research of the Distributed Parameters Control System with Moving Boundary显示文摘This paper presents a brief summary of the three development stages of investigation on the transpiration cooling and its control for aircraft, missiles and electromagnetic gun, then the control problem of the distributed parameters system with a moving boundary is derived. It introduces the mathematical model of the transpiration cooling control, its control characteristics, and the present situation of the experimental and theoretical study on this problem. This paper also describes the main study results and the existing problems. The prospective application is also reported. The major references in every developing stage are listed systematically for further study. | Yang, Xueshi Yu, Jingyuan Zhu, Guangtian | 1993 | Journal of Systems Engineering and Electronics1993，4，3： | 9 |
| 4 | Multi-objective short-term scheduling of active distribution networks for benefit maximization of DisCos and DG owners considering demand response programs and energy storage system显示文摘This paper proposes a multi-objective benefit function for operation of active distribution systems considering demand response program(DRP)and energy storage system(ESS).In the active distribution system,active network management(ANM)is applied so that the distribution system equipment is controlled in real-time status based on the real-time measurements of system parameters(voltages and currents).The multi-objective optimization problem is solved using e-constraint method,and a fuzzy satisfying approach has been employed to select the best compromise solution.Two different objective functions are considered as follows:benefit maximization of distribution company(DisCo);benefit maximization of distributed generation owner(DGO).To increase the benefits and efficient implementation of distributed generation(DG),DGO has installed battery as energy storage system(ESS)in parallel with DG unit.Consequently,DGO decides for the battery charging/discharging.DisCo has the ability to exchange energy with the upstream network and DGO.Also,DisCo focuses to study the effect of demand response program(DRP)on total benefit function and consequently its influence on the load profile has been discussed.This model is successfully applied to a 33-bus radial distribution network. | Saeed ABAPOUR Sayyad NOJAVAN Mehdi ABAPOUR | 2018 | Journal of Modern Power Systems and Clean Energy2018，6，1： | 8 |
| 5 | SOLUTION OF A CLASS OF INVESTMENT DEVELOPMENTAL EQUATIONS显示文摘The paper discusses the solution of a class of assets developmental equations. We get the existence and uniqueness of global solution, and under the constancy of state obtain the stability of solution. | JIAO Hongbing (Department of Mathematics, Hebei Teacher’s University, Shijiazhuang 050016, China) YU Jingyuan (Beijing Institute of Information and Control, Beijing 100037, China) QI Chuanda (Henan Xinyang Teacher’s College, Xinyany 464000, China) | 2000 | Systems Science and Mathematical Sciences2000，13，2： | 4 |
| 6 | An Application-Oriented Cache Allocation and Prefetching Method for Long-Running Applications in Distributed Storage Systems显示文摘Characteristics of long-running applications in cloud and big data environment are various and significantly influence the performance of cache systems.The gap between existing cache systems and the increasing performance requirements motivates us to propose the Application-oriented cache allocation and prefetching method(ACAP)to improve data access performance.An application-oriented cache allocation approach is designed based on hit count growth rates for a higher overall hit rate.Two application-oriented sequential prefetching approaches are proposed to improve the hit rate and prefetching accuracy by learning average read sizes of long-running applications.Based on correlation of data accesses,a parallelized correlated-directed prefetching approach is proposed to further increase the hit rate.Above approaches are intergrated to obtain the maximized hit rate and prefetching accuracy.Experimental results on12 public real system traces show that ACAP achieves14.03%(up to 33.82%)higher prefetching accuracy and2.01%(up to 7.54%)higher hit rate compared with the best combination of baselines. | GUO Chang LI Ying LIU Hongzhi WU Zhonghai | 2019 | Chinese Journal of Electronics2019，28，4： | 4 |
| 7 | Leader-following consensus of second-order nonlinear multi-agent systems with intermittent position measurements显示文摘This work studies the leader-following consensus problem of second-order nonlinear multi-agent systems with aperiodically intermittent position measurements. Through the filter-based method, a novel intermittent consensus protocol without velocity measurements is designed for each follower exclusively based on the relative position measurements of neighboring agents. Under the common assumption that only relative position measurements between the neighboring agents are intermittently used, some consensus conditions are derived for second-order leader-following multi-agent systems with inherent delayed nonlinear dynamics. Moreover, for multi-agent systems without inherent delayed nonlinear dynamics, some simpler consensus conditions are presented. Finally, some simulation examples are presented to verify and illustrate the theoretical results. | Fuyong WANG Zhongxin LIU Zengqiang CHEN | 2019 | Science China(Information Sciences)2019，62，10： | 3 |
| 8 | Storage capacity allocation strategy for distribution network with distributed photovoltaic generators显示文摘Distributed photovoltaic generators(DPGs) have been integrated into the medium/low voltage distribution network widely. Due to the randomness and fluctuation of DPG, however, the distribution and direction of power flow changed frequently some days. Therefore, more attention is needed to ensure the safe operation of the distribution network. The installation of energy storage systems(ESSs) can help the network withstand thefluctuations caused by DPG. Based on the discrete Fourier transform method, this paper presents an ESS capacity allocation strategy for the medium/low voltage distribution network with DPG. The reliability scenario models are created via Latin hypercube sampling with Cholesky decomposition and scenario reduction. Numerical results show that the proposed strategy can reduce the power flow fluctuation with less ESS capacity, and increase the penetration capacity of DPG in the distribution network while maintaining the quality of the power supply. | Bin LI Xingchen LI Xiaoqing BAI Zhineng LI | 2018 | Journal of Modern Power Systems and Clean Energy2018，6，6： | 2 |
| 9 | OPTIMAL CONTROL THEORY FOR INFINITE DIMENSIONAL SYSTEMS | 李训经 雍炯敏 | 1992 | Progress in Natural Science:Materials International1992，2，2： | 2 |
| 10 | Improving Performance of a Distributed File System Using a Speculative Semantics-Based Algorithm显示文摘File-sharing semantics is used by the file systems for sharing data among concurrent client processes in a consistent manner. Session semantics is a widely used file-sharing semantics in Distributed File Systems(DFSs). The main disadvantage of session semantics is that writes to an open file are visible to the concurrent client processes only during their next session. Recently, 'linearizability semantics' was introduced in Blob Seer DFS, in which a Read Client Process(RCP) can read only a previous version of a binary large object(blob), while update operations are carried out on that blob in a concurrent manner. In this paper, we propose a new type of file-sharing semantics, namely 'speculative semantics', which permits writes to an open file to be visible to other concurrent processes provided that data consistency is not affected. In addition, we propose a new read algorithm for DFSs based on speculative semantics and a new performance measurement metric called Currency. The experimental results obtained using Blob Seer DFS indicate that the proposed read algorithm performs better than the existing read algorithm of Blob Seer DFS. | Talluri Lakshmi Siva Rama Krishna Thirumalaisamy Ragunathan Sudheer Kumar Battula | 2015 | Tsinghua Science and Technology2015，20，6： | 2 |
| 11 | Iterative Learning Control for Distributed Parameter Systems Based on Non-Collocated Sensors and Actuators显示文摘In this paper, an open-loop PD-type iterative learning control(ILC) scheme is first proposed for two kinds of distributed parameter systems(DPSs) which are described by parabolic partial differential equations using non-collocated sensors and actuators. Then, a closed-loop PD-type ILC algorithm is extended to a class of distributed parameter systems with a non-collocated single sensor and m actuators when the initial states of the system exist some errors. Under some given assumptions, the convergence conditions of output errors for the systems can be obtained. Finally, one numerical example for a distributed parameter system with a single sensor and two actuators is presented to illustrate the effectiveness of the proposed ILC schemes. | Jianxiang Zhang Baotong Cui Xisheng Dai Zhengxian Jiang | 2020 | IEEE/CAA Journal of Automatica Sinica2020，7，3： | 2 |
| 12 | Identification for a class of distributed parameter systems | 邹振宇 | 2000 | Progress in Natural Science:Materials International2000，10，3： | 1 |
| 13 | Energy Efficient Speed Scaling and Task Scheduling for Distributed Computing Systems显示文摘With the rapid development of the performance of computer systems, energy consumption has been increasing dramatically as well. Energy efficiency has been paid much attention, especially in large-scale distributed computing systems. We propose an effective approach for energy reduction, by dynamic speed scaling and task scheduling simultaneously. Markov models for distributed computing systems are proposed, and detailed analyses of the models are provided. Markov decision processes(MDP) are applied for problem formulation, and MDP algorithms for obtaining the optimal solutions are introduced. The efficacy of our approach is further validated by simulation experiments. | HUANG Jiwei LIN Chuang CHENG Bo | 2015 | Chinese Journal of Electronics2015，24，3： | 1 |
| 14 | Fault-Tolerant Mechanism of the Distributed Cluster Computers显示文摘The distributed system with high performance and stability is commonly adopted in large scale scientific and engineering computing. In this paper, we discuss a fault-tolerant mechanism under Linux circumstance to improve the fault-tolerant ability of the system, namely a scheme and frame to form the stable computing platform. In terms of the structure and function of the distributed system, active list and file invocation strategies are employed in the task management. System multilevel fault-tolerance can be achieved by repeated processes in a single node and task migration on multi-nodes. Manager node agent introduced in this paper administrates the nodes using the list, disposes of the tasks according to the nodes' performance, and hence, to be able to make full use of the cluster resources. An evaluation method is proposed to appraise the performance. The analyzed results show the usefulness of the scheme proposed except for some additional overhead of memory consumption. | 尚毅梓 靳洋 吴保生 | 2007 | Tsinghua Science and Technology2007，12，S1： | 1 |
| 15 | Variable Structure Control of Distributed Parameter Systems and Application to the System of Heat Process | ZHAO Wenrong Department of Mathematics,Ningxia Education College,Yinchuan,750002 HOU Xuezhang Department of Mathematics,Northeast Normal University,Changchun,130024 | 1994 | Systems Science and Systems Engineering1994，4，3： | 1 |
| 16 | Convex decomposition of concave clouds for the ultra-short-term power prediction of distributed photovoltaic system显示文摘Concave clouds will cause miscalculation by the power prediction model based on cloud features for distributed photovoltaic( PV) plant. The algorithm for decomposing concave cloud into convex images is proposed. Adopting minimum polygonal approximation( MPP) to demonstrate the contour of concave cloud,cloud features are described and the subdivision lines of convex decomposition for the concave clouds are determined by the centroid point scattering model and centroid angle function,which realizes the convex decomposition of concave cloud. The result of MATLAB simulation indicates that the proposed algorithm can accurately detect cloud contour corners and recognize the concave points. The proposed decomposition algorithm has advantages of less time complexity and decomposition part numbers compared to traditional algorithms. So the established model can make the convex decomposition of complex concave clouds completely and quickly,which is available for the existing prediction algorithm for the ultra-short-term power output of distributed PV system based on the cloud features. | 蔡世波 Tong Jianjun Bao Guanjun Pan Guobing Zhang Libin Xu Fang | 2016 | High Technology Letters2016，22，3： | 1 |
| 17 | Chaos Control and Bifurcation Behavior for a Sprott E System with Distributed Delay Feedback显示文摘In this paper, the problem of controlling chaos in a Sprott E system with distributed delay feedback is considered. By analyzing the associated characteristic transcendental equation, we focus on the local stability and Hopf bifurcation nature of the Sprott E system with distributed delay feedback. Some explicit formulae for determining the stability and the direction of the Hopf bifurcation periodic solutions are derived by using the normal form theory and center manifold theory. Numerical simulations for justifying the theoretical analysis are provided. | Chang-Jin Xu Yu-Sen Wu | 2015 | International Journal of Automation and computing2015，12，2： | 1 |
| 18 | LCCFS: a lightweight distributed file system for cloud computing without journaling and metadata services显示文摘The major usage of a file system integrated with a cloud computing platform is to provide the storage for VM(virtual machine) instances. Distributed file systems, especially those implemented on top of object storage have many potential advantages over traditional local file systems for VM instance storage. In this paper, we make an investigation in the requirements imposed on a file system in cloud computing scenario,and claim that the implementation of a file system for VM instance storage could be reasonably simplified. We demonstrate that on top of an object storage with simple object-granularity transaction support, a lightweight distributed file system, which requires neither journaling nor dedicated metadata services, can be developed for cloud computing. We have implemented such a distributed file system, called LCCFS(lightweight cloud computing file system), based on the RADOS(reliable autonomic distributed object storage) object storage.Our experimental results show that for the main workloads in cloud computing, LCCFS achieves almost the same or slightly higher performance than CephFS(ceph filesystem), another published distributed file system based on RADOS. Compared to CephFS, LCCFS has only one tenth of its LOCs(lines of code). This theoretical simplicity makes it easy to implement LCCFS correctly and stably by avoiding the sheer design and implementation complexity behind CephFS, thereby making LCCFS a promising candidate in the cloud computing production environment. | Li WANG Jingling XUE Xiangke LIAO Yunchuan WEN Min CHEN | 2019 | Science China(Information Sciences)2019，62，7： | 1 |
| 19 | Delay-dependent stability of linear multistep methods for differential systems with distributed delays显示文摘This paper deals with the stability of linear multistep methods for multidimensional differential systems with distributed delays. The delay-dependent stability of linear multistep methods with compound quadrature rules is studied. Several new sufficient criteria of delay-dependent stability are obtained by means of the argument principle. An algorithm is provided to check delay-dependent stability. An example that illustrates the effectiveness of the derived theoretical results is given. | Yanpei WANG Yuhao CONG Guangda HU | 2018 | Applied Mathematics and Mechanics(English Edition)2018，39，12： | 1 |
| 20 | Adaptive Multisensor Tracking Fusion Algorithm for Air-borne Distributed Passive Sensor Network显示文摘AdaptiveMultisensorTrackingFusionAlgorithmforAir-borneDistributedPassiveSensorNetwork￥ZhenDing;HongcaiZhang&GuanzhongDai(Depa... | Zhen Ding Hongcai Zhang & Guanzhong Dai (Department of Automatic Control, Northwestern Polytechnical UniversityShaanxi, Xi’an 710072, P.R.China) | 1996 | Journal of Systems Engineering and Electronics1996，7，3： | 0 |
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