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An efficient consistency algorithm for the Temporal Constraint Satisfaction Problem

AI COMMUNICATIONS 2004年第4期17卷 213-221页

作者： Choueiry, BY Xu, L Univ Nebraska Dept Comp Sci & Engn Constraint Syst Lab Lincoln NE 68588 USA

Dechter et al. [5] proposed solving the Temporal Constraint Satisfaction Problem (TCSP) by modeling it as a meta-CSP, which is a finite CSP with a unique global constraint. The size of this global constraint is exponential in the number of time points in the original TCSP, and generalized-arc consistency is equivalent to finding the minimal network of the TCSP, which is NP-hard. We introduce AC, an efficient consistency algorithm for filtering the meta-CSP. This algorithm significantly reduces the domains of the variables of the meta-CSP without guaranteeing arc-consistency. We use AC as a preprocessing step to solving the meta-CSP. We show experimentally that it dramatically reduces the size of a meta-CSP and significantly enhances the performance of search for finding the minimal network of the corresponding TCSP.

关键词： constraint temporal networks consistency algorithm

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Distributed Target Tracking in Sensor Networks by consistency algorithm and Semantic Moving Computing of Internet of Things

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IEEE ACCESS 2022年 10卷 51634-51642页

作者： Wang, Yun Liu, Han Zhou, Jun Wan, Yi Shanxi Polytech Coll Dept Comp Engn Taiyuan 030006 Peoples R China Hebei Univ Coll Qual & Tech Supervis Baoding 071002 Peoples R China Chongqing Business Vocat Coll Sch Artificial Intelligence Chongqing 401331 Peoples R China Southwest Technol & Engn Res Inst Chongqing 401331 Peoples R China Southwest Univ Sci & Technol Sch Informat Engn Mianyang 621010 Sichuan Peoples R China

The target tracking algorithm of mobile wireless sensor networks involves target motion trend prediction and subsequent node guidance. This study aims to solve the problems of global consistency of node information and significant errors in forecasting fast-moving targets' trajectories through traditional distributed tracking methods in sensor networks. Initially, the average consistency algorithm is used to average the local measurements of each node to achieve global consistency. Then, semantic moving computing of the Internet of Things calculates and analyzes the node movement to support the subsequent movement guidance of nodes and target movement prediction. Finally, the simulation experiment is carried out to evaluate the commonly used target trajectory prediction model. The simulation results show that the node movement algorithm by average consistency can effectively improve the positioning accuracy of the network for moving targets. Besides, the positioning error decreases with the increase of the sensing radius R, the number of moving nodes nm, and the total number of nodes ns deployed in a particular range in a two-dimensional (2D) space. The positioning error after node movement in 2D space is about 20%-30%R lower than that in a static state. After node movement in a three-dimensional (3D) space, the positioning error is about 40%-50%R lower than in a dormant state. When the target moves at a speed greater than 7m/s, the consistency-based moving computing algorithm's target loss rate and tracking errors are about 0 similar to 10% and 1.5%similar to 2% lower than the target tracking algorithm via Kalman Filter. Therefore, the algorithm reported here can precisely track the high-speed moving target. The existing research on point target tracking has problems of insufficient accuracy and robustness. The algorithm proposed here has stronger robustness, reduced data error in multi-node, and more flexible node movements, providing a reference for the subsequen

关键词： consistency algorithm moving computing algorithm mobile wireless sensor network distributed target tracking

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An Adaptive Virtual Impedance Adjustment Based on Average consistency algorithm

An Adaptive Virtual Impedance Adjustment Based on Average Co...

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58th IEEE/IAS Industrial and Commercial Power Systems Technical Conference Asia (IEEE I and CPS Asia)

作者： Zhang, Boyang Wang, Hui Jin, Xiaotang Shandong Univ Sch Elect Engn Jinan Peoples R China

ISBN: (数字)9781665450669

ISBN: (纸本)9781665450669

The independent and stable operation of micro-grid provides technical guarantee for Self-Sustained Highway. At present, there is a contradiction between voltage and power regulation in traditional secondary control. In this paper, a virtual impedance adaptive adjustment based on consistency algorithm is proposed to solve the above problems. Firstly, adjacent DGs communicate to exchange information of real-time power. Calculating compensation from adaptive impedance layer with consistency algorithm. The deviation of primary control is adjusted by dynamic virtual impedance. This method can distribute active power according to capacity, and reduce the voltage deviation at the same time. The effectiveness of the method is validated by the simulation and experimental results.

关键词： hierarchical control adaptive virtual impedance consistency algorithm

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Reconfigurable consistency algorithm

Reconfigurable consistency algorithm

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8th International Conference on High-Performance Computing in Asia-Pacific Region

作者： Pousa, Christiane V. Goes, Luis F. W. Martins, Carlos A. P. S. Pontificia Univ Catolica Minas Gerais Grad Program Elect Engn Computat & Digital Syst Grp Belo Horizonte MG Brazil

ISBN: (纸本)0769524869

In this paper, we propose, present and analyze the behavior and the performance of a reconfigurable algorithm for shared objects consistency management in distributed systems. Object sharing allows nodes to concurrently/parallel access a same set of replicated objects. However, it is necessary that the nodes know when and how to do these accesses, avoiding inconsistencies in the objects state. The RCA (Reconfigurable consistency algorithm) is a reconfigurable algorithm that guarantees the objects consistency. This algorithm modifies its behavior and structure according to the changes in the workload and distributed systems parameters. The paper shows that: the use of RCA generates flexibility and improves the performance in 30%, on average.

关键词： consistency algorithm objects distributed shared memory

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Optimization and Scheduling of Distributed Flexible Resources in Novel Power System Based on consistency algorithm 6

Optimization and Scheduling of Distributed Flexible Resource...

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6th International Conference on Renewable Energy and Power Engineering (REPE)

作者： Chen, Baosheng Zhang, Weiqi Zhang, Zelong Yang, Yan State Grid Ningxia Elect Power Co Ltd Econ & Tech Res Inst Yinchuan Ningxia Peoples R China

ISBN: (纸本)9798350306194;9798350306187

The new power system integrates multiple entities such as energy suppliers, load aggregators and energy stations. There are information privacy and technical barriers between subjects, which are independent and interrelated, and some subjects can achieve two-way interaction and energy trading. The new power system for areas includes multiple distributed power sources and multiple energy supply units, and each energy supply unit is independent and coupled to each other. Aiming at the lowest power supply cost, the operation cost model of each equipment in the system is established, and the consistency algorithm is used to optimize the operation state of each equipment in the system. Experiments show that the consensus algorithm can respond quickly and effectively to the changes in the system load to ensure the economy of the system operation.

关键词： new power system multi subject equipment operation model consistency algorithm load variation

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Coordinated Control Strategy of Islanded DC Microgrid Based on consistency algorithm 19

Coordinated Control Strategy of Islanded DC Microgrid Based ...

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19th IEEE International Conference on Mechatronics and Automation (IEEE ICMA)

作者： Li, Dongxu Xia, Zhu Feng, Renjie Chen, Lixian Liu, Hongda China Southern Power Grid Guangzhou Power Supply Bur Tianhe Rd Guangzhou Peoples R China Dongfang Elect Co Ltd Int Business Dept Airport Rd Yantai Peoples R China Harbin Engn Univ Coll ISSE Nantong St Harbin Peoples R China

ISBN: (数字)9781665408530

ISBN: (纸本)9781665408530;9781665408523

The islanded DC microgrid undertakes its voltage control and power management alone because of its independency from the grid. The line impedance brings difficulties for the droop control strategy to improve the control of the bus voltage and the power management of battery storage units (BSUs) at the same time. Therefore, a secondary coordinated control strategy, including the BSU power management and the bus voltage correction, is proposed in this paper, which improves the conventional droop control strategy. The droop control is the primary control, leading to the decline of bus voltages. The secondary control is a distributed control based on the consistency algorithm to correct the bus voltages, by increasing the system load until the BSUs reach the same state of charge (SoC). The effectiveness of the proposed strategy is verified by experiments in the Matlab/Simulink.

关键词： Islanded DC microgrid secondary coordinated control consistency algorithm distributed control

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A consistency algorithm for Causal and Totally Ordered Event Delivery in DVE

A Consistency Algorithm for Causal and Totally Ordered Event...

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3rd IEEE International Conference on Computer Science and Information Technology (ICCSIT)

作者： Zhou, Hangjun Zhang, Wei Peng, Yuxing Li, Sikun Natl Univ Def Technol Sch Comp Sci Key Lab Sci & Technol Natl Def Parallel & Distrib Changsha 410073 Hunan Peoples R China Hunan Coll Finance & Econ Dept Informat & Management Changsha 410205 Hunan Peoples R China

ISBN: (纸本)9781424455379

How to preserve causal and totally ordered event delivery is an important issue in real-time serverless DVE(Distributed Virtual Environment). However, most of the related works are designed to maintain causal order merely or time stamped order with intensive computation and bandwidth overhead. In this paper, we proposed a novel distributed algorithm to maintain the before-and-after relationship between events, both causal and concurrent, of DVE at each individual node. Several simulation experiments are carried out to evaluate the performance of our algorithm and the results demonstrate that the algorithm is effective in preserving causal and totally ordered event delivery and more efficient than the previous algorithms.

关键词： distributed virtual environment causal and totally ordered concurrent events consistency algorithm

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A consistency algorithm for Causal and Totally Ordered Event Delivery in DVE

A Consistency Algorithm for Causal and Totally Ordered Event...

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2010 3rd IEEE International Conference on Computer Science and Information Technology—ICCSIT 2010

作者： Hangjun Zhou1,2 Wei Zhang1 Yuxing Peng1 and Sikun Li1 1Key Laboratory of Science and Technology for National Defence of Parallel and Distributed Processing, School of Computer Science, National University of Defense Technology, Chang Sha, Hu Nan, 410073, P. R. of China 2Department of Information Management, Hunan College of Finance and Economics, Chang Sha, Hu Nan, 410205, P. R. of China

关键词： distributed virtual environment causal and totally ordered concurrent events consistency algorithm

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Sliding mode consistency tracking control of multiple heavy haul trains under input saturation and safety distance constraints

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JOURNAL OF THE FRANKLIN INSTITUTE 2023年第12期360卷 9028-9049页

作者： He, Jing Yang, Xingxing Zhang, Changfan Xiao, Mingjie Hunan Univ Technol Coll Elect & Informat Engn Zhuzhou 412007 Hunan Peoples R China Guangxi Power Grid Co Guilin Power Supply Bur Guilin 541000 Guangxi Peoples R China

In order to ensure that under the influence of input saturation, a safe distance between adjacent locomotives and adjacent trains in multiple heavy haul trains (HHTS) is main-tained, an anti-saturation sliding mode consistency (ASMC) control algorithm is proposed. First, a multitrain and multiparticle dynamic model (MMDM) based on multitrain single particle that considers nonlinear coupling force and external disturbance effect is established. Next, a dynamic auxiliary compensation (DAC) system combined with sliding mode surface that can rapidly reduce the saturation deviation is designed and consistency algorithm of the simplified control structure is introduced to construct the ASMC control algorithm. Then, theoretical derivation proved that the algorithm can ensure the convergence of the tracking distance between adjacent locomotives and between adjacent trains to a bounded safe range whilst overcoming the influence of input saturation on each train. Lastly, the simulink and RT-LAB simulation results are used to verify the effectiveness of the design algorithm. & COPY;2022 The Franklin Institute. Published by Elsevier Ltd. All rights reserved.

关键词： Heavy haul train Input saturation Sliding mode control consistency algorithm Dynamic auxiliary compensation system

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A knowledge-based parameter consistency management system for concurrent and collaborative design

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE 2007年第1期221卷 97-107页

作者： Wang, Wei-ming Hu, Jie Yin, Ji-long Peng, Ying-hong Shanghai Jiao Tong Univ Sch Mech Engn Inst Knowledge Based Engn Shanghai 200240 Peoples R China

This paper discusses rule-based reasoning parameter consistency management system based on knowledge in concurrent and corroborative product design using a combination of both mathematical methods and knowledge-based Engineering (KBE) techniques. First, the framework of the parameter consistency management system is developed. Second, a data-mining algorithm known as the fuzzy-rough algorithm is presented for modelling of knowledge-level constraints from numerical simulation. Then, the method of integrated case-based reasoning (CBR) and rule-based reasoning (RBR) with an interval consistency algorithm is adopted to predict the potential conflicts and specify the interval of design parameters. Finally, ontology is used as a communication language between cooperating engineering design teams. The system is demonstrated by the design of a crank connecting link in a V6 engine.

关键词： constraint network knowledge-level constraints fuzzy-rough algorithm case-based reasoning rule-based reasoning consistency algorithm engine

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