Entropy (Basel, Switzerland)最新文献_第10页

A New Topology-Switching Strategy for Fault Diagnosis of Multi-Agent Systems Based on Belief Rule Base. 基于信念规则库的多智能体故障诊断拓扑切换新策略。

IF 2.7

Entropy (Basel, Switzerland) Pub Date : 2022-11-02 DOI: 10.3390/e24111591

Ziyi Wang, Shaohua Li, Wei He, Ruohan Yang, Zhichao Feng, Guowen Sun

{"title":"A New Topology-Switching Strategy for Fault Diagnosis of Multi-Agent Systems Based on Belief Rule Base.","authors":"Ziyi Wang, Shaohua Li, Wei He, Ruohan Yang, Zhichao Feng, Guowen Sun","doi":"10.3390/e24111591","DOIUrl":"https://doi.org/10.3390/e24111591","url":null,"abstract":"Effective fault-diagnosis strategies have been the focus of research on multi-agent systems (MASs). In this paper, the belief rule base (BRB)-based distributed fault-diagnosis problem for MASs is investigated, and a topology-switching strategy is developed to increase the reliability of fault-diagnosis model. Firstly, a BRB-based distributed fault-diagnosis model is constructed for the MAS with multiple faults, then expert knowledge is used to judge whether the agent is faulty. Then, considering that the system may be influenced by the fault or some other factors and thus leading to a decrease in the accuracy of the fault-diagnosis results, a topology-switching strategy based on the average distance of the output diagnosis accuracy is proposed to update the topology of the agent so that the fault-diagnosis results can be more reliable. Note that the topology-switching threshold is designed based on the average distance between the accuracy of the fault diagnosis of each agent. The method proposed in this paper can solve the problem when the fault-diagnosis accuracy of the model is affected by some common factors and thus decreases, and can improve the reliability of the fault-diagnosis model very well. Finally, the effectiveness of the BRB-based distributed fault-diagnosis model and the proposed topology-switching strategy to improve the fault-diagnosis accuracy is verified by simulation examples.","PeriodicalId":520609,"journal":{"name":"Entropy (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2022-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9689439/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40466635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Advanced Architecture of On-Board Multiplex Information Exchange System to Increase Flight Safety. 提高飞行安全的机载多路信息交换系统的先进架构。

IF 2.7

Entropy (Basel, Switzerland) Pub Date : 2022-11-01 DOI: 10.3390/e24111582

Viktor Dashkiiev, Yuriy Povstenko

引用次数: 1

Schrödinger's Cat Meets Occam's Razor. Schrödinger的猫遇到了奥卡姆的剃刀。

IF 2.7

Entropy (Basel, Switzerland) Pub Date : 2022-11-01 DOI: 10.3390/e24111586

Richard D Gill

{"title":"Schrödinger's Cat Meets Occam's Razor.","authors":"Richard D Gill","doi":"10.3390/e24111586","DOIUrl":"https://doi.org/10.3390/e24111586","url":null,"abstract":"We discuss V.P. Belavkin's approach to the Schrödinger cat problem and show its close relation to ideas based on superselection and interaction with the environment developed by N.P. Landsman. The purpose of the paper is to explain these ideas in the most simple possible context, namely: discrete time and separable Hilbert spaces, in order to make them accessible to those coming from the philosophy of science and not too happy with idiosyncratic notation and terminology and sophisticated mathematical tools. Conventional elementary mathematical descriptions of quantum mechanics take \"measurement\" to be a primitive concept. Paradoxes arise when we choose to consider smaller or larger systems as measurement devices in their own right, by making different and apparently arbitrary choices of location of the \"Heisenberg cut\". Various quantum interpretations have different resolutions of the paradox. In Belavkin's approach, the classical world around us does really exist, and it evolves stochastically and dynamically in time according to probability laws following from successive applications of the Born law. It is a collapse theory. The quantum/classical distinction is determined by the arrow of time. The underlying unitary evolution of the wave-function of the universe enables the designation of a collection of beables which grows as time evolves, and which therefore can be assigned random, classical trajectories. In a slogan: the past is particles, the future is a wave. We, living in the now, are located on the cutting edge between past and future.","PeriodicalId":520609,"journal":{"name":"Entropy (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9689171/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40694569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Shannon Entropy: An Econophysical Approach to Cryptocurrency Portfolios. 香农熵:加密货币投资组合的经济物理学方法。

IF 2.7

Entropy (Basel, Switzerland) Pub Date : 2022-11-01 DOI: 10.3390/e24111583

Noé Rodriguez-Rodriguez, Octavio Miramontes

引用次数: 2

Optimisation and Efficiency Improvement of Electric Vehicles Using Computational Fluid Dynamics Modelling. 基于计算流体动力学模型的电动汽车优化与效率提升。

IF 2.7

Entropy (Basel, Switzerland) Pub Date : 2022-11-01 DOI: 10.3390/e24111584

Darryl Afianto, Yu Han, Peiliang Yan, Yan Yang, Anas F A Elbarghthi, Chuang Wen

{"title":"Optimisation and Efficiency Improvement of Electric Vehicles Using Computational Fluid Dynamics Modelling.","authors":"Darryl Afianto, Yu Han, Peiliang Yan, Yan Yang, Anas F A Elbarghthi, Chuang Wen","doi":"10.3390/e24111584","DOIUrl":"https://doi.org/10.3390/e24111584","url":null,"abstract":"Due to the rise in awareness of global warming, many attempts to increase efficiency in the automotive industry are becoming prevalent. Design optimization can be used to increase the efficiency of electric vehicles by reducing aerodynamic drag and lift. The main focus of this paper is to analyse and optimise the aerodynamic characteristics of an electric vehicle to improve efficiency of using computational fluid dynamics modelling. Multiple part modifications were used to improve the drag and lift of the electric hatchback, testing various designs and dimensions. The numerical model of the study was validated using previous experimental results obtained from the literature. Simulation results are analysed in detail, including velocity magnitude, drag coefficient, drag force and lift coefficient. The modifications achieved in this research succeeded in reducing drag and were validated through some appropriate sources. The final model has been assembled with all modifications and is represented in this research. The results show that the base model attained an aerodynamic drag coefficient of 0.464, while the final design achieved a reasonably better overall performance by recording a 10% reduction in the drag coefficient. Moreover, within individual comparison with the final model, the second model with front spitter had an insignificant improvement, limited to 1.17%, compared with 11.18% when the rear diffuser was involved separately. In addition, the lift coefficient was significantly reduced to 73%, providing better stabilities and accounting for the safety measurements, especially at high velocity. The prediction of the airflow improvement was visualised, including the pathline contours consistent with the solutions. These research results provide a considerable transformation in the transportation field and help reduce fuel expenses and global emissions.","PeriodicalId":520609,"journal":{"name":"Entropy (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9689435/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40694567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Research on Remaining Useful Life Prediction Method of Rolling Bearing Based on Digital Twin. 基于数字孪生的滚动轴承剩余使用寿命预测方法研究。

IF 2.7

Entropy (Basel, Switzerland) Pub Date : 2022-10-31 DOI: 10.3390/e24111578

Rui Zhang, Zhiqiang Zeng, Yanfeng Li, Jiahao Liu, Zhijian Wang

{"title":"Research on Remaining Useful Life Prediction Method of Rolling Bearing Based on Digital Twin.","authors":"Rui Zhang, Zhiqiang Zeng, Yanfeng Li, Jiahao Liu, Zhijian Wang","doi":"10.3390/e24111578","DOIUrl":"https://doi.org/10.3390/e24111578","url":null,"abstract":"Bearing is a key part of rotating machinery. Accurate prediction of bearing life can avoid serious failures. To address the current problem of low accuracy and poor predictability of bearing life prediction, a bearing life prediction method based on digital twins is proposed. Firstly, the vibration signals of rolling bearings are collected, and the time-domain and frequency-domain features of the actual data set are extracted to construct the feature matrix. Then unsupervised classification and feature selection are carried out by improving the self-organizing feature mapping method. Using sensitive features to construct a twin dataset framework and using the integrated learning CatBoost method to supplement the missing data sets, a complete digital twin dataset is formed. Secondly, important information is extracted through macro and micro attention mechanisms to achieve weight amplification. The life prediction of rolling bearing is realized by using fusion features. Finally, the proposed method is verified by experiments. The experimental results show that this method can predict the bearing life with a limited amount of measured data, which is superior to other prediction methods and can provide a new idea for the health prediction and management of mechanical components.","PeriodicalId":520609,"journal":{"name":"Entropy (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9689441/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40677994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Generalized Landauer Bound for Information Processing: Proof and Applications. 信息处理的广义Landauer界:证明与应用。

IF 2.7

Entropy (Basel, Switzerland) Pub Date : 2022-10-31 DOI: 10.3390/e24111568

Neal G Anderson

{"title":"Generalized Landauer Bound for Information Processing: Proof and Applications.","authors":"Neal G Anderson","doi":"10.3390/e24111568","DOIUrl":"https://doi.org/10.3390/e24111568","url":null,"abstract":"A generalized form of Landauer's bound on the dissipative cost of classical information processing in quantum-mechanical systems is proved using a new approach. This approach sidesteps some prominent objections to standard proofs of Landauer's bound-broadly interpreted here as a nonzero lower bound on the amount of energy that is irreversibly transferred from a physical system to its environment for each bit of information that is lost from the system-while establishing a far more general result. Specializations of our generalized Landauer bound for ideal and non-ideal information processing operations, including but not limited to the simplified forms for erasure and logical operations most familiar from the literature, are presented and discussed. These bounds, taken together, enable reconsideration of the links between logical reversibility, physical reversibility, and conditioning of operations in contexts that include but are far more general than the thermodynamic model systems that are most widely invoked in discussions of Landauer's Principle. Because of the strategy used to prove the generalized bounds and these specializations, this work may help to illuminate and resolve some longstanding controversies related to dissipation in computation.","PeriodicalId":520609,"journal":{"name":"Entropy (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9689189/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40677989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Survey of Hybrid Free Space Optics (FSO) Communication Networks to Achieve 5G Connectivity for Backhauling. 实现5G回程连接的混合自由空间光学(FSO)通信网络研究。

IF 2.7

Entropy (Basel, Switzerland) Pub Date : 2022-10-31 DOI: 10.3390/e24111573

Omar Aboelala, It Ee Lee, Gwo Chin Chung

{"title":"A Survey of Hybrid Free Space Optics (FSO) Communication Networks to Achieve 5G Connectivity for Backhauling.","authors":"Omar Aboelala, It Ee Lee, Gwo Chin Chung","doi":"10.3390/e24111573","DOIUrl":"https://doi.org/10.3390/e24111573","url":null,"abstract":"Increased capacity, higher data rate, decreased latency, and better service quality are examples of the primary objectives or needs that must be catered to in the near future, i.e., fifth-generation (5G) and beyond. To fulfil these needs, cellular network design must be drastically improved. The 5G cellular network design, huge multiple-input multiple-output (MIMO) technology, and device-to-device communication are all highlighted in this comprehensive study. Hence, free-space optics (FSO) is a promising solution to address this field. However, FSO standalone is insufficient during turbulent weather conditions. FSO systems possess some limitations, such as being able to be disturbed by any interference between sender and receiver such as a flying bird and a tree, as it requires line-of-sight (LOS) connectivity. Moreover, it is sensitive to weather conditions; the FSO performance significantly decreases in bad weather conditions such as fog and snow; those factors deteriorate the performance of FSO. This paper conducts a systematic survey on the existing projects in the same area of research such as the hybrid FSO/Radio frequency (RF) communication system by listing each technique used for each model to achieve optimum performance in terms of data rate and Bit Error Rate (BER) to be implemented in 5G networks.","PeriodicalId":520609,"journal":{"name":"Entropy (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9689289/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40677523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Correspondence Rules for SU(1,1) Quasidistribution Functions and Quantum Dynamics in the Hyperbolic Phase Space. 双曲相空间中SU(1,1)拟分布函数的对应规则与量子动力学。

IF 2.7

Entropy (Basel, Switzerland) Pub Date : 2022-10-31 DOI: 10.3390/e24111580

Miguel Baltazar, Iván F Valtierra, Andrei B Klimov

引用次数: 0

Bearing-Fault Diagnosis with Signal-to-RGB Image Mapping and Multichannel Multiscale Convolutional Neural Network. 基于信号到rgb图像映射和多通道多尺度卷积神经网络的轴承故障诊断。

IF 2.7

Entropy (Basel, Switzerland) Pub Date : 2022-10-31 DOI: 10.3390/e24111569

Ming Xu, Jinfeng Gao, Zhong Zhang, Heshan Wang

{"title":"Bearing-Fault Diagnosis with Signal-to-RGB Image Mapping and Multichannel Multiscale Convolutional Neural Network.","authors":"Ming Xu, Jinfeng Gao, Zhong Zhang, Heshan Wang","doi":"10.3390/e24111569","DOIUrl":"https://doi.org/10.3390/e24111569","url":null,"abstract":"Deep learning bearing-fault diagnosis has shown strong vitality in recent years. In industrial practice, the running state of bearings is monitored by collecting data from multiple sensors, for instance, the drive end, the fan end, and the base. Given the complexity of the operating conditions and the limited number of bearing-fault samples, obtaining complementary fault features using the traditional fault-diagnosis method, which uses statistical characteristic in time or frequency, is difficult and relies heavily on prior knowledge. In addition, intelligent bearing-fault diagnosis based on a convolutional neural network (CNN) has several deficiencies, such as single-scale fixed convolutional kernels, excessive dependence on experts' experience, and a limited capacity for learning a small training dataset. Considering these drawbacks, a novel intelligent bearing-fault-diagnosis method based on signal-to-RGB image mapping (STRIM) and multichannel multiscale CNN (MCMS-CNN) is proposed. First, the signals from three different sensors are converted into RGB images by the STRIM method to achieve feature fusion. To extract RGB image features effectively, the proposed MCMS-CNN is established, which can automatically learn complementary and abundant features at different scales. By increasing the width and decreasing the depth of the network, the overfitting caused by the complex network for a small dataset is eliminated, and the fault classification capability is guaranteed simultaneously. The performance of the method is verified through the Case Western Reserve University's (CWRU) bearing dataset. Compared with different DL approaches, the proposed approach can effectively realize fault diagnosis and substantially outperform other methods.","PeriodicalId":520609,"journal":{"name":"Entropy (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9689231/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40677520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1