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The Combination of Two Control Strategies for Series Hybrid Electric Vehicles 预览
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作者 Can Luo Zhen Shen +2 位作者 Simos Evangelou Gang Xiong Fei-Yue Wang 《自动化学报:英文版》 CSCD 2019年第2期596-608,共13页
With most countries paying attention to the environment protection, hybrid electric vehicles have become a focus of automobile research and development due to the characteristics of energy saving and low emission. Pow... With most countries paying attention to the environment protection, hybrid electric vehicles have become a focus of automobile research and development due to the characteristics of energy saving and low emission. Power follower control strategy(PFCS) and DC-link voltage control strategy are two sorts of control strategies for series hybrid electric vehicles(HEVs). Combining those two control strategies is a new idea for control strategy of series hybrid electric vehicles. By tuning essential parameters which are the defined constants under DClink voltage control and under PFCS, the points of minimum mass of equivalent fuel consumption(EFC) corresponding to a series of variables are marked for worldwide harmonized light vehicles test procedure(WLTP). The fuel economy of series HEVs with the combination control schemes performs better compared with individual control scheme. The results show the effects of the combination control schemes for series HEVs driving in an urban environment. 展开更多
关键词 DC-Link VOLTAGE CONTROL power FOLLOWER CONTROL strategy series hybrid electric VEHICLES tuning
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Complement C7 is a novel risk gene for Alzheimer's disease in Han Chinese
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作者 Deng-Feng Zhang Yu Fan +19 位作者 Min Xu Guihong Wang Dong Wang Jin Li Li-Li Kong Hejiang Zhou Rongcan Luo Rui Bi Yong Wu Guo-Dong Li Ming Li Xiong-Jian Luo Hong-Yan Jiang Liwen Tan Chunjiu Zhong Yiru Fang Chen Zhang Nengyin Sheng Tianzi Jiang Yong-Gang Yao 《国家科学评论:英文版》 CSCD 2019年第2期257-274,共18页
Alzheimer’s disease is the most common neurodegenerative disease,and has a high level of genetic heritability and population heterogeneity.In this study,we performed the whole-exome sequencing of Han Chinese patients... Alzheimer’s disease is the most common neurodegenerative disease,and has a high level of genetic heritability and population heterogeneity.In this study,we performed the whole-exome sequencing of Han Chinese patients with familial and/or early-onset Alzheimer’s disease,followed by independent validation,imaging analysis and function characterization.We identified an exome-wide significant rare missense variant rs3792646(p.K420Q)in the C7 gene in the discovery stage(P=1.09×10-6,odds ratio=7.853)and confirmed the association in different cohorts and a combined sample(1615 cases and 2832 controls,Pcombined=2.99×10-7,odds ratio=1.930).The risk allele was associated with decreased hippocampal volume and poorer working memory performance in early adulthood,thus resulting in an earlier age of disease onset.Overexpression of the mutant p.K420Q disturbed cell viability,immune activation and β-amyloid processing.Electrophysiological analyses showed that the mutant p.K420Q impairs the inhibitory effect of wild type C7 on the excitatory synaptic transmission in pyramidal neurons.These findings suggested that C7 is a novel risk gene for Alzheimer’s disease in Han Chinese. 展开更多
关键词 Alzheimer's disease whole-exome sequencing C7 NEUROIMAGING COMPLEMENT system
ASAF: altered spontaneous activity fingerprinting in Alzheimer's disease based on multisite fMRI
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作者 Jiachen Li Dan Jin +20 位作者 Ang Li Bing Liu Chengyuan Song Pan Wang Dawei Wang Kaibin Xu Hongwei Yang Hongxiang Yao Bo Zhou Alexandre Bejanin Gael Chetelat Tong Han Jie Lu Qing Wang Chunshui Yu Xinqing Zhang Yuying Zhou Xi Zhang Tianzi Jiang Yong Liu Ying Han 《科学通报:英文版》 SCIE EI CSCD 2019年第14期998-1010,共13页
Several monocentric studies have noted alterations in spontaneous brain activity in Alzheimer's disease (AD), although there is no consensus on the altered amplitude of low-frequency fluctuations in AD patients. T... Several monocentric studies have noted alterations in spontaneous brain activity in Alzheimer's disease (AD), although there is no consensus on the altered amplitude of low-frequency fluctuations in AD patients. The main aim of the present study was to identify a reliable and reproducible abnormal brain activity pattern in AD. The amplitude of local brain activity (AM), which can provide fast mapping of spontaneous brain activity across the whole brain, was evaluated based on multisite rs-fMRI data for 688 subjects (215 normal controls (NCs), 221 amnestic mild cognitive impairment (aMCI) 252 AD). Two-sample t-tests were used to detect group differences between AD patients and NCs from the same site. Differences in the AM maps were statistically analyzed via the Stouffer's meta-analysis. Consistent regions of lower spontaneous brain activity in the default mode network and increased activity in the bilateral hippocampus/parahippocampus, thalamus, caudate nucleus, orbital part of the middle frontal gyrus and left fusiform were observed in the AD patients compared with those in NCs. Significant correlations (P?<?0.05, Bonferroni corrected) between the normalized amplitude index and Mini-Mental State Examination scores were found in the identified brain regions, which indicates that the altered brain activity was associated with cognitive decline in the patients. Multivariate analysis and leave-one-site-out cross-validation led to a 78.49% prediction accuracy for single-patient classification. The altered activity patterns of the identified brain regions were largely correlated with the FDG-PET results from another independent study. These results emphasized the impaired brain activity to provide a robust and reproducible imaging signature of AD. 展开更多
关键词 Brain SPONTANEOUS activity Multisite Biomarkers Leave-one-site-out cross-validation Alzheimer's disease
Optimal Design and Force Control of a Nine-Cable-Driven Parallel Mechanism for Lunar Takeoff Simulation
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作者 Wangmin Yi Yu Zheng +3 位作者 Weifang Wang XiaoqiangTang Xinjun Liu Fanwei Meng 《中国机械工程学报:英文版》 SCIE EI CAS CSCD 2019年第4期35-46,共12页
Traditional simulation methods are unable to meet the requirements of lunar takeo simulations, such as high force output precision, low cost, and repeated use. Considering that cable-driven parallel mechanisms have th... Traditional simulation methods are unable to meet the requirements of lunar takeo simulations, such as high force output precision, low cost, and repeated use. Considering that cable-driven parallel mechanisms have the advantages of high payload to weight ratio, potentially large workspace, and high-speed motion, these mechanisms have the potential to be used for lunar takeo simulations. Thus, this paper presents a parallel mechanism driven by nine cables. The purpose of this study is to optimize the dimensions of the cable-driven parallel mechanism to meet dynamic workspace requirements under cable tension constraints. The dynamic workspace requirements are derived from the kinematical function requests of the lunar takeo simulation equipment. Experimental design and response surface methods are adopted for building the surrogate mathematical model linking the optimal variables and the optimization indices. A set of dimensional parameters are determined by analyzing the surrogate mathematical model. The volume of the dynamic workspace increased by 46% after optimization. Besides, a force control method is proposed for calculating output vector and sinusoidal forces. A force control loop is introduced into the traditional position control loop to adjust the cable force precisely, while controlling the cable length. The e ectiveness of the proposed control method is verified through experiments. A 5% vector output accuracy and 12 Hz undulation force output can be realized. This paper proposes a cable-driven parallel mechanism which can be used for lunar takeo simulation. 展开更多
关键词 FORCE control LUNAR TAKEOFF SIMULATION Parallel ROBOTS Surrogate mathematical model
A Heuristic Algorithm for the Fabric Spreading and Cutting Problem in Apparel Factories 预览
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作者 Xiuqin Shang Dayong Shen +1 位作者 Fei-Yue Wang Timo R. Nyberg 《自动化学报:英文版》 CSCD 2019年第4期961-968,共8页
We study the fabric spreading and cutting problem in apparel factories.For the sake of saving the material costs,the cutting requirement should be met exactly without producing additional garment components.For reduci... We study the fabric spreading and cutting problem in apparel factories.For the sake of saving the material costs,the cutting requirement should be met exactly without producing additional garment components.For reducing the production costs,the number of lays that corresponds to the frequency of using the cutting beds should be minimized.We propose an iterated greedy algorithm for solving the fabric spreading and cutting problem.This algorithm contains a constructive procedure and an improving loop.Firstly the constructive procedure creates a set of lays in sequence,and then the improving loop tries to pick each lay from the lay set and rearrange the remaining lays into a smaller lay set.The improving loop will run until it cannot obtain any smaller lay set or the time limit is due.The experiment results on 500 cases show that the proposed algorithm is effective and efficient. 展开更多
关键词 Construction and improvement CUTTING and PACKING FABRIC SPREADING and CUTTING HEURISTIC algorithm
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A Kind of Lean Approach for Removing Wastes From Non-Manufacturing Process With Various Facilities 预览
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作者 Guangyu Xiong Xiuqin Shang +1 位作者 Gang Xiong Timo R.Nyberg 《自动化学报:英文版》 CSCD 2019年第1期307-315,共9页
It is important to identify and remove the wastes not only from manufacturing process, but also from nonmanufacturing process. In the last several decades, significant research achievements and practice benefits have ... It is important to identify and remove the wastes not only from manufacturing process, but also from nonmanufacturing process. In the last several decades, significant research achievements and practice benefits have been achieved about removing wastes from manufacturing process. Since the1990 s, some researchers and lean practitioners have paid more attention to removing waste from non-manufacturing process.Based on the authors’ research work and industrial practice, the paper introduces a kind of lean approach for removing waste from non-manufacturing process. In its case study, the order handling process in a value chain is described with respect to a factory and its downstream distribution centers(DCs). The paper proposes a lean approach solution for creating the improved order handling process, and analyze how great improvements in performance can be achieved. As a result, the significant achievement has created a win-win scenario for both the nonmanufacturing process in a factory and non-manufacturing facilities(like DCs) across the value chain. It demonstrates that improvements have been made by removing waste from the non-manufacturing process that takes place within a factory as well as with external participants through the whole value chain. Likewise, the proposed lean approach has helped the case companies to achieve greater levels of efficiency and more benefits. Finally, some conclusions are drawn. 展开更多
关键词 LEAN APPROACH non-manufacturing PROCESS optimized order handling PROCESS removing WASTES value chain win-win scenario
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Parallel Planning:A New Motion Planning Framework for Autonomous Driving 预览
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作者 Long Chen Xuemin Hu +3 位作者 Wei Tian Hong Wang Dongpu Cao Fei-Yue Wang 《自动化学报:英文版》 CSCD 2019年第1期236-246,共11页
Motion planning is one of the most significant technologies for autonomous driving. To make motion planning models able to learn from the environment and to deal with emergency situations, a new motion planning framew... Motion planning is one of the most significant technologies for autonomous driving. To make motion planning models able to learn from the environment and to deal with emergency situations, a new motion planning framework called as'parallel planning' is proposed in this paper. In order to generate sufficient and various training samples, artificial traffic scenes are firstly constructed based on the knowledge from the reality.A deep planning model which combines a convolutional neural network(CNN) with the Long Short-Term Memory module(LSTM) is developed to make planning decisions in an end-toend mode. This model can learn from both real and artificial traffic scenes and imitate the driving style of human drivers.Moreover, a parallel deep reinforcement learning approach is also presented to improve the robustness of planning model and reduce the error rate. To handle emergency situations, a hybrid generative model including a variational auto-encoder(VAE) and a generative adversarial network(GAN) is utilized to learn from virtual emergencies generated in artificial traffic scenes. While an autonomous vehicle is moving, the hybrid generative model generates multiple video clips in parallel, which correspond to different potential emergency scenarios. Simultaneously, the deep planning model makes planning decisions for both virtual and current real scenes. The final planning decision is determined by analysis of real observations. Leveraging the parallel planning approach, the planner is able to make rational decisions without heavy calculation burden when an emergency occurs. 展开更多
关键词 AUTONOMOUS driving artificial traffic SCENE deep learning EMERGENCIES motion PLANNING PARALLEL PLANNING
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Enhanced CNN for image denoising 预览
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作者 Chunwei Tian Yong Xu +3 位作者 Lunke Fei Junqian Wang Jie Wen Nan Luo 《智能技术学报》 2019年第1期17-23,共7页
Owing to the flexible architectures of deep convolutional neural networks(CNNs)are successfully used for image denoising.However,they suffer from the following drawbacks:(i)deep network architecture is very difficult ... Owing to the flexible architectures of deep convolutional neural networks(CNNs)are successfully used for image denoising.However,they suffer from the following drawbacks:(i)deep network architecture is very difficult to train.(ii)Deeper networks face the challenge of performance saturation.In this study,the authors propose a novel method called enhanced convolutional neural denoising network(ECNDNet).Specifically,they use residual learning and batch normalisation techniques to address the problem of training difficulties and accelerate the convergence of the network.In addition,dilated convolutions are used in the proposed network to enlarge the context information and reduce the computational cost.Extensive experiments demonstrate that the ECNDNet outperforms the state-of-the-art methods for image denoising. 展开更多
关键词 ECNDNet CNNS
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Scalable and ultrafast epitaxial growth of single-crystal graphene wafers for electrically tunable liquid-crystal microlens arrays
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作者 Bing Deng Zhaowei Xin +18 位作者 Ruiwen Xue Shishu Zhang Xiaozhi Xu Jing Gao Jilin Tang Yue Qi Yani Wang Yan Zhao Luzhao Sun Huihui Wang Kaihui Liu Mark H. Rummeli Lu-Tao Weng Zhengtang Luo Lianming Tong Xinyu Zhang Changsheng Xie Zhongfan Liu Hailin Peng 《科学通报:英文版》 SCIE EI CSCD 2019年第10期659-668,共10页
The scalable growth of wafer-sized single-crystal graphene in an energy-efficient manner and compatible with wafer process is critical for the killer applications of graphene in high-performance electronics and optoel... The scalable growth of wafer-sized single-crystal graphene in an energy-efficient manner and compatible with wafer process is critical for the killer applications of graphene in high-performance electronics and optoelectronics. Here, ultrafast epitaxial growth of single-crystal graphene wafers is realized on singlecrystal Cu90Ni10(1 1 1) thin films fabricated by a tailored two-step magnetron sputtering and recrystallization process. The minor nickel(Ni) content greatly enhances the catalytic activity of Cu, rendering the growth of a 4 in. single-crystal monolayer graphene wafer in 10 min on Cu90Ni10(1 1 1), 50 folds faster than graphene growth on Cu(1 1 1). Through the carbon isotope labeling experiments, graphene growth on Cu90Ni10(1 1 1) is proved to be exclusively surface-reaction dominated, which is ascribed to the Cu surface enrichment in the Cu Ni alloy, as indicated by element in-depth profile. One of the best benefits of our protocol is the compatibility with wafer process and excellent scalability. A pilot-scale chemical vapor deposition(CVD) system is designed and built for the mass production of single-crystal graphene wafers, with productivity of 25 pieces in one process cycle. Furthermore, we demonstrate the application of single-crystal graphene in electrically controlled liquid-crystal microlens arrays(LCMLA), which exhibit highly tunable focal lengths near 2 mm under small driving voltages. By integration of the graphene based LCMLA and a CMOS sensor, a prototype camera is proposed that is available for simultaneous light-field and light intensity imaging. The single-crystal graphene wafers could hold great promising for highperformance electronics and optoelectronics that are compatible with wafer process. 展开更多
关键词 GRAPHENE ULTRAFAST growth CuNi(1 1 1)thin film Single CRYSTAL wafer Liquid CRYSTAL MICROLENS arrays
Enhancing sensitivity to ambient refractive index with tunable few-layer graphene/hBN nanoribbons
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作者 Huan Jiang Sajid Choudhury +5 位作者 Zhaxylyk A.Kudyshev Di Wang Ludmila J.Prokopeva Peng Xiao Yongyuan Jiang Alexander V.Kildishev 《光子学研究:英文版》 CSCD 2019年第7期130-137,共8页
Refractive index (RI) sensing helps to identify biomolecules and chemicals in the mid-infrared range for drug discovery, bioengineering, and environmental monitoring. In this paper, we numerically demonstrate an elect... Refractive index (RI) sensing helps to identify biomolecules and chemicals in the mid-infrared range for drug discovery, bioengineering, and environmental monitoring. In this paper, we numerically demonstrate an electrically tunable RI sensor with ultrahigh sensitivity using a three-layer graphene nanoribbon array separated by hexagonal boron nitride (hBN). Unlike the weak resonance in single-layer graphene nanoribbons, a much stronger plasmon resonance featuring a higher-quality factor can be excited in the graphene/hBN few-layer ribbon array. Simultaneously, the high purity of graphene on hBN results in an outstanding charge mobility above 4 ×10^4 cm^2 · V^-1·s^-1 at 300 K, which allows a larger modulation depth. The interaction between the locally enhanced field around graphene ribbons and its surrounding analyte leads to ultrahigh sensitivity (4.207μm/RIU), with the figure of merit reaching approximately 58.Moreover, this ultrasensitive detector could selectively work in different wavebands by controlling gate voltages applied to graphene.These merits of ultrahigh sensitivity and electrical tunability are major advances compared to previous RI sensors, paving a way toward ultrasensitive detection using graphene/hBN few-layer devices. 展开更多
关键词 ENHANCING sensitivity refractive index NANORIBBONS
A novel binary/real-valued pigeon-inspired optimization for economic/environment unit commitment with renewables and plug-in vehicles
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作者 Zhile YANG Kailong LIU +3 位作者 Jianping FAN Yuanjun GUO Qun NIU Jianhua ZHANG 《中国科学:信息科学(英文版)》 SCIE EI CSCD 2019年第7期139-141,共3页
Dear editor,Among multiple levels of power and energy scheduling,day-ahead unit commitment(UC)has long been a challenging task for power system operators owing to the strong constrained,mixedinteger,and high-dimension... Dear editor,Among multiple levels of power and energy scheduling,day-ahead unit commitment(UC)has long been a challenging task for power system operators owing to the strong constrained,mixedinteger,and high-dimensional characteristics.The objective of UC is to minimize the fossil fuel cost in thermal power generation by determining the on–off status and power generation output while maintaining physical constraints,such as the demand balance and capacity limits[1]. 展开更多
关键词 NOVEL BINARY OPTIMIZATION RENEWABLES
A Prescribed Performance Adaptive Control for Hysteresis Hammerstein System
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作者 GAO Xuehui ZHAO Wei +2 位作者 WANG Shubo WANG Minlin REN Xuemei 《系统科学与复杂性学报:英文版》 SCIE EI CSCD 2019年第4期1039-1052,共14页
A prescribed performance adaptive control(PPAC)is proposed for Hammerstein system where nonlinearity is described by backlash-like hysteresis.In order to simplify the controller design as well as guarantee the precisi... A prescribed performance adaptive control(PPAC)is proposed for Hammerstein system where nonlinearity is described by backlash-like hysteresis.In order to simplify the controller design as well as guarantee the precision of the controlled system,the tracking error is transformed into performance error by two steps.The first step is to transform the tracking error into scalar error,but it magnifies the tracking error decreasing the accuracy of the controlled system.Therefore,a new S(z)is proposed for prescribed performance function(PPF)and the second step is transforming the scalar error into performance error by the proposed PPF,which guarantees the scalar error converges to a prescribed bound to improve the control accuracy.Finally,Lambert W function is introduced for the Lyapunov function candidate to guarantee the closed-loop system bounded and the tracking error converged.Simulations demonstrate the effectiveness of the proposed approaches. 展开更多
关键词 HAMMERSTEIN HYSTERESIS Lambert W FUNCTION PRESCRIBED PERFORMANCE
Design of an electronic label for logistics temperature monitoring with low power consumption
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作者 刘志昂 张全 《光电子快报:英文版》 EI 2019年第1期16-20,共5页
There are many problems when traditional temperature sensing radio frequency identification(RFID) tags are applied to logistics temperature monitoring, such as inconvenient data reading, large power consumption, and l... There are many problems when traditional temperature sensing radio frequency identification(RFID) tags are applied to logistics temperature monitoring, such as inconvenient data reading, large power consumption, and low bandwidth. Therefore, a low-dissipation electronic tag is designed in this paper to solve the above problems. The electronic tag and the portable temperature recorder were placed in the same position in the same refrigeration unit, and the temperature of the same space was recorded at the same time. The data measured by the designed electronic tag was used as the measured value, and the data measured by the portable temperature recorder was used as the standard value. The correlation coefficient between the two was calculated to be 0.866 9, the root mean square error(RMSE) was 0.796 7 ℃, and the average relative deviation(ARD) was 16.21%. Therefore, the electronic tag designed in this study can meet the requirements of users for temperature monitoring and recording. The temperature control switch designed in this study can disconnect the power supply to single chip microcomputer(SCM) and other modules when the temperature is in the range of normal threshold, so that the power consumption is further reduced and the cost is reduced. The results of this study laid a foundation for the development of low-cost and easy-to-use temperature monitoring technology in the logistics process. 展开更多
关键词 DESIGN LABEL TEMPERATURE
Complex system and intelligent control: theories and applications
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作者 Jie CHEN Ben M.CHEN Jian SUN 《信息与电子工程前沿:英文版》 SCIE EI CSCD 2019年第1期1-3,共3页
Complex systems are the systems that consist of a great many diverse and autonomous but interacting and interdependent components whose aggregate behaviors are nonlinear. As phased by Aristotle,'the whole is more ... Complex systems are the systems that consist of a great many diverse and autonomous but interacting and interdependent components whose aggregate behaviors are nonlinear. As phased by Aristotle,'the whole is more than the sum of its parts;' properties of complex systems are not a simple summation of their individual parts.Complex systems are widespread. Typical examplesofcomplexsystemscanbefoundinthehuman brain,flocking formation of migrating birds,power grid,transportation systems,autonomous vehicles,social networks, and communication networks. 展开更多
关键词 COMPLEX system and INTELLIGENT CONTROL theories and APPLICATIONS UAV
Hypervelocity impact induced shock acoustic emission waves for quantitative damage evaluation using in situ miniaturized piezoelectric sensor network
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作者 Menglong LIU Qiang WANG +3 位作者 Qingming ZHANG Renrong LONG Fangsen CUI Zhongqing SU 《中国航空学报:英文版》 SCIE EI CAS CSCD 2019年第5期1059-1070,共12页
Manmade debris and natural meteoroids, travelling in the Low Earth Orbit at a speed of several kilometers per second, pose a severe safety concern to the spacecraft in service through the HyperVelocity Impact(HVI). To... Manmade debris and natural meteoroids, travelling in the Low Earth Orbit at a speed of several kilometers per second, pose a severe safety concern to the spacecraft in service through the HyperVelocity Impact(HVI). To address this issue, an investigation of shock Acoustic Emission(AE) waves induced by HVI to a downscaled two-layer Whipple shielding structure is performed,to realize a quantitative damage evaluation. Firstly a hybrid numerical model integrating smoothparticle hydrodynamics and finite element is built to obtain the wave response. The projectiles, with various impact velocities and directions, are modelled to impact the shielding structure with different thicknesses. Then experimental validation is carried out with built-in miniaturized piezoelectric sensors to in situ sense the HVI-induced AE waves. A quantitative agreement is obtained between numerical and experimental results, demonstrating the correctness of the hybrid model and facilitating the explanation of obtained AE signals in experiment. Based on the understanding of HVI-induced wave components, assessment of the damage severity, i.e., whether the outer shielding layer is perforated or not, is performed using the energy ratio between the regions of "high frequency" and "low frequency" in the acquired AE signals. Lastly, the direct-arrival fundamentalsymmetric wave mode is isolated from each sensing signal to be input into an enhanced delay-andsum algorithm, which visualizes HVI spots accurately and instantaneously with different sensor network configuration. All these works demonstrate the potential of quantitative, in situ, and real time HVI monitoring using miniaturized piezoelectric sensor network. 展开更多
关键词 Acoustic Emission(AE) Damage detection HYPERVELOCITY impact PIEZOELECTRIC sensor WHIPPLE SHIELDING assembly
A Review on Swarm Intelligence and Evolutionary Algorithms for Solving Flexible Job Shop Scheduling Problems 预览
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作者 Kaizhou Gao Zhiguang Cao +3 位作者 Le Zhang Zhenghua Chen Yuyan Han Quanke Pan 《自动化学报:英文版》 CSCD 2019年第4期904-916,共13页
Flexible job shop scheduling problems(FJSP)have received much attention from academia and industry for many years.Due to their exponential complexity,swarm intelligence(SI)and evolutionary algorithms(EA)are developed,... Flexible job shop scheduling problems(FJSP)have received much attention from academia and industry for many years.Due to their exponential complexity,swarm intelligence(SI)and evolutionary algorithms(EA)are developed,employed and improved for solving them.More than 60%of the publications are related to SI and EA.This paper intents to give a comprehensive literature review of SI and EA for solving FJSP.First,the mathematical model of FJSP is presented and the constraints in applications are summarized.Then,the encoding and decoding strategies for connecting the problem and algorithms are reviewed.The strategies for initializing algorithms?population and local search operators for improving convergence performance are summarized.Next,one classical hybrid genetic algorithm(GA)and one newest imperialist competitive algorithm(ICA)with variables neighborhood search(VNS)for solving FJSP are presented.Finally,we summarize,discus and analyze the status of SI and EA for solving FJSP and give insight into future research directions. 展开更多
关键词 EVOLUTIONARY algorithm flexible JOB SHOP scheduling REVIEW SWARM INTELLIGENCE
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A New Method of Wind Turbine Bearing Fault Diagnosis Based on Multi-Masking Empirical Mode Decomposition and Fuzzy C-Means Clustering
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作者 Yongtao Hu Shuqing Zhang +3 位作者 Anqi Jiang Liguo Zhang Wanlu Jiang Junfeng Li 《中国机械工程学报:英文版》 SCIE EI CAS CSCD 2019年第3期156-167,共12页
Based on Multi-Masking Empirical Mode Decomposition (MMEMD) and fuzzy c-means (FCM) clustering, a new method of wind turbine bearing fault diagnosis FCM-MMEMD is proposed, which can determine the fault accurately and ... Based on Multi-Masking Empirical Mode Decomposition (MMEMD) and fuzzy c-means (FCM) clustering, a new method of wind turbine bearing fault diagnosis FCM-MMEMD is proposed, which can determine the fault accurately and timely. First, FCM clustering is employed to classify the data into different clusters, which helps to estimate whether there is a fault and how many fault types there are. If fault signals exist, the fault vibration signals are then demodulated and decomposed into different frequency bands by MMEMD in order to be analyzed further. In order to overcome the mode mixing defect of empirical mode decomposition (EMD), a novel method called MMEMD is proposed. It is an improvement to masking empirical mode decomposition (MEMD). By adding multi-masking signals to the signals to be decomposed in different levels, it can restrain low-frequency components from mixing in highfrequency components effectively in the sifting process and then suppress the mode mixing. It has the advantages of easy implementation and strong ability of suppressing modal mixing. The fault type is determined by Hilbert envelope finally. The results of simulation signal decomposition showed the high performance of MMEMD. Experiments of bearing fault diagnosis in wind turbine bearing fault diagnosis proved the validity and high accuracy of the new method. 展开更多
关键词 Wind TURBINE bearing FAULTS diagnosis Multi-masking empirical mode decomposition (MMEMD) Fuzzy c-mean (FCM) CLUSTERING
Enhanced Autonomous Exploration and Mapping of an Unknown Environment with the Fusion of Dual RGB-D Sensors 预览
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作者 Ningbo Yu Shirong Wang 《工程(英文)》 2019年第1期164-172,共9页
The autonomous exploration and mapping of an unknown environment is useful in a wide range of applications and thus holds great significance. Existing methods mostly use range sensors to generate twodimensional (2D) g... The autonomous exploration and mapping of an unknown environment is useful in a wide range of applications and thus holds great significance. Existing methods mostly use range sensors to generate twodimensional (2D) grid maps. Red/green/blue-depth (RGB-D) sensors provide both color and depth information on the environment, thereby enabling the generation of a three-dimensional (3D) point cloud map that is intuitive for human perception. In this paper, we present a systematic approach with dual RGB-D sensors to achieve the autonomous exploration and mapping of an unknown indoor environment. With the synchronized and processed RGB-D data, location points were generated and a 3D point cloud map and 2D grid map were incrementally built. Next, the exploration was modeled as a partially observable Markov decision process. Partial map simulation and global frontier search methods were combined for autonomous exploration, and dynamic action constraints were utilized in motion control. In this way, the local optimum can be avoided and the exploration efficacy can be ensured. Experiments with single connected and multi-branched regions demonstrated the high robustness, efficiency, and superiority of the developed system and methods. 展开更多
关键词 AUTONOMOUS EXPLORATION Red/green/blue-depth Sensor fusion Point cloud Partial map simulation Global FRONTIER search
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A pigeon-inspired optimization algorithm for many-objective optimization problems
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作者 Zhihua CUI Jiangjiang ZHANG +4 位作者 Yechuang WANG Yang CAO Xingjuan CAI Wensheng ZHANG Jinjun CHEN 《中国科学:信息科学(英文版)》 SCIE EI CSCD 2019年第7期131-138,共8页
Dear editor,Swarm intelligence optimization algorithms are inspired by the behaviour of biological groups in nature. Such algorithms have the advantages of a clear structure, simple operation, comprehensible principle... Dear editor,Swarm intelligence optimization algorithms are inspired by the behaviour of biological groups in nature. Such algorithms have the advantages of a clear structure, simple operation, comprehensible principles, strong parallelism, effective search abilities, and strong robustness. They can effectively solve difficult problems that traditional methods cannot. 展开更多
关键词 BEHAVIOUR comprehensible PRINCIPLES TRADITIONAL methods
Kuroshio intrusion into the South China Sea with an anticyclonic eddy: evidence from underwater glider observation 预览
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作者 LIU Zenghong CHEN Xingrong +2 位作者 YU Jiancheng XU Dongfeng SUN Chaohui 《海洋湖沼学报(英文)》 SCIE CAS CSCD 2019年第5期1469-1480,共12页
In this study, high-resolution temperature and salinity data obtained from three Sea-Wing underwater gliders were used together with satellite altimeter data to track the vertical thermohaline structure of an anticycl... In this study, high-resolution temperature and salinity data obtained from three Sea-Wing underwater gliders were used together with satellite altimeter data to track the vertical thermohaline structure of an anticyclonic eddy that originated from the loop current of the Kuroshio southwest of Taiwan, China. One of the gliders crossed the entire eddy and it observed a remarkable warm anomaly of as much as 3.9℃ extending to 500 dbar from the base of the mixed layer. Conversely, a positive salinity anomaly was found to be above 200 dbar only in the anticyclonic eddy, with a maximum value of >0.5 in the mixed layer. Below the mixed layer, water of higher salinity (>34.7) was found, which could have been preserved through constrained vertical mixing within the anticyclonic eddy. The salinity in the upper layer of the anticyclonic eddy was much similar to that of the northwestern Pacific Ocean than the northern South China Sea, reflecting Kuroshio intrusion with anticyclonic eddy shedding from the loop current. 展开更多
关键词 anticyclonic EDDY South China SEA KUROSHIO Sea-Wing underwater GLIDER
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