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分形网络协同制造中进度监控的方法及实现 被引量:5
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作者 董红召 刘冬旭 +1 位作者 赵燕伟 陈鹰 《计算机集成制造系统》 EI CSCD 北大核心 2004年第7期779-783,共5页
在分形网络协同制造系统中,协作目标包含了工作流自相似的多级子目标,但缺乏有效的基于Web的方法来监控所有级别子任务的执行进度。为解决这一问题,提出了表述多级协作目标进度和协作方制造资源变化等信息的综合自相似算法。基于该算法... 在分形网络协同制造系统中,协作目标包含了工作流自相似的多级子目标,但缺乏有效的基于Web的方法来监控所有级别子任务的执行进度。为解决这一问题,提出了表述多级协作目标进度和协作方制造资源变化等信息的综合自相似算法。基于该算法,提出依靠每一个子任务的Web曲线来获取进度信息的自相似方法。阐述了综合多个同级子目标进度的方法,以获得总的进度情况。因此,各级分形协同制造系统的盟主可以对相关子任务的进度进行监控。实践表明,该方法可以简练地反映出多级协作目标的动态进度和合作企业生产资源的变化状况。 展开更多
关键词 分形网络协同制造 进度算法 进度监控 多级协作目标 自相似
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网络化制造环境下企业联盟的项目进度监控策略研究 被引量:5
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作者 赵明光 易红 《中国机械工程》 EI CAS CSCD 北大核心 2006年第14期1480-1483,共4页
提出企业联盟中各级盟员执行进度的计算方法,该计算方法用进度曲线的形式来获取盟员的进度信息;提出以任务实施计划图、进度计算、进度汇报和进度监控为主流程的进度监控策略,该策略可以简练地反映出多级子项目的动态进度和盟员生产资... 提出企业联盟中各级盟员执行进度的计算方法,该计算方法用进度曲线的形式来获取盟员的进度信息;提出以任务实施计划图、进度计算、进度汇报和进度监控为主流程的进度监控策略,该策略可以简练地反映出多级子项目的动态进度和盟员生产资源的变化状况。 展开更多
关键词 网络化制造 企业联盟 进度算法 进度监控
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基于VB与SQL Server的企业MRP系统开发 被引量:2
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作者 张业明 魏修亭 +1 位作者 李中凯 刘勇 《计算机工程与设计》 CSCD 北大核心 2007年第6期1412-1414,1417,共4页
根据彩电企业的实际生产需要,结合MRP的基本概念,开发出一套企业MRP系统;以VB+SQL Server 2000的数据库开发模式,在仓库管理、产品物料清单(BOM)管理与月生产准备计划管理的基础上,实现了月采购计划和月生产进度计划的编制;研究出生产... 根据彩电企业的实际生产需要,结合MRP的基本概念,开发出一套企业MRP系统;以VB+SQL Server 2000的数据库开发模式,在仓库管理、产品物料清单(BOM)管理与月生产准备计划管理的基础上,实现了月采购计划和月生产进度计划的编制;研究出生产进度安排算法;算法具有一定的普遍性,同时适用于其它一些家电企业的生产管理。 展开更多
关键词 物料需求计划 仓库管理 物料清单 采购计划 生产进度安排算法
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Location of high seismic activity zones and seismic hazard assessment in Zabrze Bielszowice coal mine using passive tomography 被引量:35
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作者 LURKA A 《Journal of China University of Mining and Technology》 2008年第2期177-181,共5页
In the paper results of passive tomography calculations have been presented to assess rockburst hazard and locate high seismic activity zones in the vicinity of longwall 306 in Zabrze Bielszowice coal mine. The area o... In the paper results of passive tomography calculations have been presented to assess rockburst hazard and locate high seismic activity zones in the vicinity of longwall 306 in Zabrze Bielszowice coal mine. The area of study was 1000 m in X direction by 900 m in Y direction. The zones of high values of P-wave propagation velocity have been found to correlate with the distribution of large seismic tremors. 展开更多
关键词 seismic tomography seismic hazard seismic P-wave velocity rockbursts evolutionary algorithms
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Dual-resource integrated scheduling method of AGV and machine in intelligent manufacturing job shop 被引量:3
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作者 YUAN Ming-hai LI Ya-dong +1 位作者 PEI Feng-que GU Wen-bin 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第8期2423-2435,共13页
In view of the fact that traditional job shop scheduling only considers a single factor, which affects the effect of resource allocation, the dual-resource integrated scheduling problem between AGV and machine in inte... In view of the fact that traditional job shop scheduling only considers a single factor, which affects the effect of resource allocation, the dual-resource integrated scheduling problem between AGV and machine in intelligent manufacturing job shop environment was studied. The dual-resource integrated scheduling model of AGV and machine was established by comprehensively considering constraints of machines, workpieces and AGVs. The bidirectional single path fixed guidance system based on topological map was determined, and the AGV transportation task model was defined. The improved A* path optimization algorithm was used to determine the optimal path, and the path conflict elimination mechanism was described. The improved NSGA-Ⅱ algorithm was used to determine the machining workpiece sequence, and the competition mechanism was introduced to allocate AGV transportation tasks. The proposed model and method were verified by a workshop production example, the results showed that the dual resource integrated scheduling strategy of AGV and machine is effective. 展开更多
关键词 dual resource integrated scheduling improved A* algorithm improved NSGA-Ⅱ algorithm competition mechanism
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Improvements in seismic event locations in a deep western U.S. coal mine using tomographic velocity models and an evolutionary search algorithm 被引量:7
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作者 LURKA Adam SWANSON Peter 《Mining Science and Technology》 EI CAS 2009年第5期599-603,共5页
Methods of improving seismic event locations were investigated as part of a research study aimed at reducing ground control safety hazards. Seismic event waveforms collected with a 23-station three-dimensional sensor ... Methods of improving seismic event locations were investigated as part of a research study aimed at reducing ground control safety hazards. Seismic event waveforms collected with a 23-station three-dimensional sensor array during longwall coal mining provide the data set used in the analyses. A spatially variable seismic velocity model is constructed using seismic event sources in a passive tomographic method. The resulting three-dimensional velocity model is used to relocate seismic event positions. An evolutionary optimization algorithm is implemented and used in both the velocity model development and in seeking improved event location solutions. Results obtained using the different velocity models are compared. The combination of the tomographic velocity model development and evolutionary search algorithm provides improvement to the event locations. 展开更多
关键词 seismic event location tomographic velocity model an evolutionary search algorithm
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Improvement of Mono-window Algorithm for Retrieving Land Surface Temperature from HJ-1B Satellite Data 被引量:13
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作者 ZHOU Ji ZHAN Wenfeng +1 位作者 HU Deyong ZHAO Xiang 《Chinese Geographical Science》 SCIE CSCD 2010年第2期123-131,共9页
The thermal infrared channel (IRS4) of HJ-1B satellite obtains view zenith angles (VZA) up to ±33°. The view angle should be taken into account when retrieving land surface temperature (LST) from IRS4 data. ... The thermal infrared channel (IRS4) of HJ-1B satellite obtains view zenith angles (VZA) up to ±33°. The view angle should be taken into account when retrieving land surface temperature (LST) from IRS4 data. This study aims at improving the mono-window algorithm for retrieving LST from IRS4 data. Based on atmospheric radiative transfer simulations,a model for correcting the VZA effects on atmospheric transmittance is proposed. In addition,a generalized model for calculating the effective mean atmospheric temperature is developed. Validation with the simulated dataset based on standard atmospheric profiles reveals that the improved mono-window algorithm for IRS4 obtains high accuracy for LST retrieval,with the mean absolute error (MAE) and root mean square error (RMSE) being 1.0 K and 1.1 K,respectively. Numerical experiment with the radiosonde profile acquired in Beijing in winter demonstrates that the improved mono-window algorithm exhibits excellent ability for LST retrieval,with MAE and RMSE being 0.6 K and 0.6 K,respectively. Further application in Qinghai Lake and comparison with the Moderate-Resolution Imaging Spectroradiometer (MODIS) LST product suggest that the improved mono-window algorithm is applicable and feasible in actual conditions. 展开更多
关键词 land surface temperature mono-window algorithm HJ-1 B satellite remote sensing
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Multi-objective optimization for draft scheduling of hot strip mill 被引量:2
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作者 李维刚 刘相华 郭朝晖 《Journal of Central South University》 SCIE EI CAS 2012年第11期3069-3078,共10页
A multi-objective optimization model for draft scheduling of hot strip mill was presented, rolling power minimizing, rolling force ratio distribution and good strip shape as the objective functions. A multi-objective ... A multi-objective optimization model for draft scheduling of hot strip mill was presented, rolling power minimizing, rolling force ratio distribution and good strip shape as the objective functions. A multi-objective differential evolution algorithm based on decomposition (MODE/D). The two-objective and three-objective optimization experiments were performed respectively to demonstrate the optimal solutions of trade-off. The simulation results show that MODE/D can obtain a good Pareto-optimal front, which suggests a series of alternative solutions to draft scheduling. The extreme Pareto solutions are found feasible and the centres of the Pareto fronts give a good compromise. The conflict exists between each two ones of three objectives. The final optimal solution is selected from the Pareto-optimal front by the importance of objectives, and it can achieve a better performance in all objective dimensions than the empirical solutions. Finally, the practical application cases confirm the feasibility of the multi-objective approach, and the optimal solutions can gain a better rolling stability than the empirical solutions, and strip flatness decreases from (0± 63) IU to (0±45) IU in industrial production. 展开更多
关键词 hot strip mill draft scheduling multi-objective optimization multi-objective differential evolution algorithm based ondecomposition (MODE/D) Pareto-optimal front
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Antenna selection based on large-scale fading for distributed MIMO systems
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作者 施荣华 Yuan Zexi +2 位作者 Dong Jian Lei Wentai Peng Chunhua 《High Technology Letters》 EI CAS 2016年第3期233-240,共8页
An antenna selection algorithm based on large-scale fading between the transmitter and receiver is proposed for the uplink receive antenna selection in distributed multiple-input multiple-output(D-MIMO) systems. By ut... An antenna selection algorithm based on large-scale fading between the transmitter and receiver is proposed for the uplink receive antenna selection in distributed multiple-input multiple-output(D-MIMO) systems. By utilizing the radio access units(RAU) selection based on large-scale fading,the proposed algorithm decreases enormously the computational complexity. Based on the characteristics of distributed systems,an improved particle swarm optimization(PSO) has been proposed for the antenna selection after the RAU selection. In order to apply the improved PSO algorithm better in antenna selection,a general form of channel capacity was transformed into a binary expression by analyzing the formula of channel capacity. The proposed algorithm can make full use of the advantages of D-MIMO systems,and achieve near-optimal performance in terms of channel capacity with low computational complexity. 展开更多
关键词 distributed MIMO systems antenna selection particle swarm optimization large-scale fading
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Application of linear active disturbance rejection control for photoelectric tracking system
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作者 王婉婷 Guo Jin +1 位作者 Jiang Zhenhua Wang Tingfeng 《High Technology Letters》 EI CAS 2017年第3期315-321,共7页
Dynamic characteristics and tracking precision are studied in the photoelectric tracking system and a linear active disturbance rejection control( LADRC) scheme is proposed for position loop. A current and speed contr... Dynamic characteristics and tracking precision are studied in the photoelectric tracking system and a linear active disturbance rejection control( LADRC) scheme is proposed for position loop. A current and speed controller is designed by a transfer function model,which is obtained by adaptive differential evolution. Model error,friction and nonlinear factor existing in position loop are treated as ‘disturbance',which is estimated and compensated by generalized proportional integral( GPI)observer. Comparative results are provided to demonstrate the remarkable performance of the proposed method. It turns out that the proposed scheme is successful and has superior features,such as quick dynamic response,low overshoot and high tracking precision. Furthermore,with the proposed method,friction is suppressed effectively. 展开更多
关键词 photoelectric tracking system linear active disturbance rejection control(LADRC) generalized proportional integral observer adaptive differential evolution
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Study on Control Performance of Bearing Temperature based on Genetic Algorithm
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作者 Nianqing Tang 《International Journal of Technology Management》 2015年第1期29-31,共3页
In order to improve the control effect of the bearing, this article studies the temperature control technology to improve the genetic algorithm, at the same time, analyze temperature simulation of bearing based on fuz... In order to improve the control effect of the bearing, this article studies the temperature control technology to improve the genetic algorithm, at the same time, analyze temperature simulation of bearing based on fuzzy PID control technology and improved genetic algorithm, the simulation results show that, the control method has good robustness based on Improved Genetic Algorithm. It can monitor a plurality of beating temperature, provides a new method for the detection and prevention of bearing fault. 展开更多
关键词 Beating' s temperature improved genetic algorithm temperature control
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A hybrid differential evolution algorithm for meta-task scheduling in grids
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作者 康钦马 Jiang Changiun +1 位作者 He Hong Huang Qiangsheng 《High Technology Letters》 EI CAS 2009年第3期261-266,共6页
Task scheduling is one of the core steps to effectively exploit the capabilities of heterogeneous re-sources in the grid.This paper presents a new hybrid differential evolution(HDE)algorithm for findingan optimal or n... Task scheduling is one of the core steps to effectively exploit the capabilities of heterogeneous re-sources in the grid.This paper presents a new hybrid differential evolution(HDE)algorithm for findingan optimal or near-optimal schedule within reasonable time.The encoding scheme and the adaptation ofclassical differential evolution algorithm for dealing with discrete variables are discussed.A simple but ef-fective local search is incorporated into differential evolution to stress exploitation.The performance of theproposed HDE algorithm is showed by being compared with a genetic algorithm(GA)on a known staticbenchmark for the problem.Experimental results indicate that the proposed algorithm has better perfor-mance than GA in terms of both solution quality and computational time,and thus it can be used to de-sign efficient dynamic schedulers in batch mode for real grid systems. 展开更多
关键词 Hybrid differential evolution grid computing task scheduling genetic algorithm
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Retinex based low-light image enhancement using guided filtering and variational framework 被引量:5
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作者 张诗 唐贵进 +2 位作者 刘小花 罗苏淮 王大东 《Optoelectronics Letters》 EI 2018年第2期156-160,共5页
A new image enhancement algorithm based on Retinex theory is proposed to solve the problem of bad visual effect of an image in low-light conditions. First, an image is converted from the RGB color space to the HSV col... A new image enhancement algorithm based on Retinex theory is proposed to solve the problem of bad visual effect of an image in low-light conditions. First, an image is converted from the RGB color space to the HSV color space to get the V channel. Next, the illuminations are respectively estimated by the guided filtering and the variational framework on the V channel and combined into a new illumination by average gradient. The new reflectance is calculated using V channel and the new illumination. Then a new V channel obtained by multiplying the new illumination and reflectance is processed with contrast limited adaptive histogram equalization(CLAHE). Finally, the new image in HSV space is converted back to RGB space to obtain the enhanced image. Experimental results show that the proposed method has better subjective quality and objective quality than existing methods. 展开更多
关键词 RGB CLAHE Retinex based low-light image enhancement using guided filtering and variational framework HSV
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VARIABLE FEEDRATE INTERPOLATION OF NURBS TOOLPATH WITH GEOMETRIC AND KINEMATICAL CONSTRAINTS FOR FIVE-AXIS CNC MACHINING 被引量:1
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作者 SUN Yuwen ZHOU Jianfeng GUO Dongming 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2013年第5期757-776,共20页
Variable feedrate interpolation algorithms for five-axis parametric toolpath are very promising but still rather limited currently.In this paper,an off-line feedrate scheduling method of dual NURBS curve is presented ... Variable feedrate interpolation algorithms for five-axis parametric toolpath are very promising but still rather limited currently.In this paper,an off-line feedrate scheduling method of dual NURBS curve is presented with geometric and kinematical constraints.For a given dual parametric curve,the feedrates of sampling points are first scheduled sequent with confined feedrate of cutter tip and machine pivot,chord error,normal acceleration and angular feedrate.Then,the feedrate profiles of angular feed acceleration sensitive regions of the path are adjusted using a bi-directional scanning algorithm.After that,a linear programming method is used to adjust the feedrate profiles of linear feed acceleration sensitive regions and control the linear feed acceleration of both cutter tip and machine pivot within preset values.Further,a NURBS curve is used to fit the feedrates of sampling points.Finally,illustrative examples are carried out to validate the feasibility of the proposed feedrate scheduling method.The results show that the proposed method has the ability of effectively controlling the angular feed characters of cutter axis as well as the chord error and linear feed characters of cutter tip and machine pivot,and it has potential to be used in high accuracy and high quality five-axis machining. 展开更多
关键词 Feedrate interpolation five-axis machining NURBS tool path.
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