Entropy最新文献_第10页

Nonadditive Entropy Application to Detrended Force Sensor Data to Indicate Balance Disorder of Patients with Vestibular System Dysfunction. 非加性熵在去趋势力传感器数据中的应用，以指示前庭系统功能障碍患者的平衡障碍。

IF 2.7 3区物理与天体物理

Entropy Pub Date : 2023-09-27 DOI: 10.3390/e25101385

Harun Yaşar Köse, Serhat İkizoğlu

{"title":"Nonadditive Entropy Application to Detrended Force Sensor Data to Indicate Balance Disorder of Patients with Vestibular System Dysfunction.","authors":"Harun Yaşar Köse, Serhat İkizoğlu","doi":"10.3390/e25101385","DOIUrl":"10.3390/e25101385","url":null,"abstract":"The healthy function of the vestibular system (VS) is of vital importance for individuals to carry out their daily activities independently and safely. This study carries out Tsallis entropy (TE)-based analysis on insole force sensor data in order to extract features to differentiate between healthy and VS-diseased individuals. Using a specifically developed algorithm, we detrend the acquired data to examine the fluctuation around the trend curve in order to consider the individual's walking habit and thus increase the accuracy in diagnosis. It is observed that the TE value increases for diseased people as an indicator of the problem of maintaining balance. As one of the main contributions of this study, in contrast to studies in the literature that focus on gait dynamics requiring extensive walking time, we directly process the instantaneous pressure values, enabling a significant reduction in the data acquisition period. The extracted feature set is then inputted into fundamental classification algorithms, with support vector machine (SVM) demonstrating the highest performance, achieving an average accuracy of 95%. This study constitutes a significant step in a larger project aiming to identify the specific VS disease together with its stage. The performance achieved in this study provides a strong motivation to further explore this topic.","PeriodicalId":11694,"journal":{"name":"Entropy","volume":"25 10","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10606935/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61561639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","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 Comprehensive Numerical Model for Reservoir-Induced Earthquake Risk Assessment. 水库诱发地震危险性评价的综合数值模型。

IF 2.7 3区物理与天体物理

Entropy Pub Date : 2023-09-26 DOI: 10.3390/e25101383

Xuefeng Peng, Rong Zhao, Kai Deng

{"title":"A Comprehensive Numerical Model for Reservoir-Induced Earthquake Risk Assessment.","authors":"Xuefeng Peng, Rong Zhao, Kai Deng","doi":"10.3390/e25101383","DOIUrl":"10.3390/e25101383","url":null,"abstract":"The assessment of seismic risk and the prevention of earthquake occurrences during reservoir operation present significant challenges in terms of accurate determination. This study aims to address this issue by developing a numerical model. The primary objective is to estimate the vulnerability of different fault types to reservoir impoundment. This model integrates essential parameters such as fault dip and the relative orientation between the reservoir and potential earthquakes, and it is structured within a risk framework using polar coordinates. Through comprehensive computations, we evaluate the alterations in elastic stress and fluid pore pressure resulting from water impoundment. This is achieved by employing a fully coupled two-dimensional poroelastic approach. Furthermore, our model incorporates relevant seismic data to enhance its accuracy. The findings of our study underscore that the critical factor lies in the fault's precise positioning with respect to the reservoir. The risk associated with a fault is contingent upon both its location and its orientation, emphasizing the importance of these factors in determining hazardous zones.","PeriodicalId":11694,"journal":{"name":"Entropy","volume":"25 10","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10606261/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61561517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Information Leakage Rate of Optical Code Division Multiple Access Network Using Wiretap Code. 使用Wiretap码的光码分多址网络的信息泄漏率。

IF 2.7 3区物理与天体物理

Entropy Pub Date : 2023-09-26 DOI: 10.3390/e25101384

Rongwo Xu, Leiming Sun, Jianhua Ji, Ke Wang, Yufeng Song

引用次数: 0

Robustness Analysis of an Urban Public Traffic Network Based on a Multi-Subnet Composite Complex Network Model. 基于多子网复合复杂网络模型的城市公共交通网络鲁棒性分析。

IF 2.7 3区物理与天体物理

Entropy Pub Date : 2023-09-25 DOI: 10.3390/e25101377

Gengxin Sun

{"title":"Robustness Analysis of an Urban Public Traffic Network Based on a Multi-Subnet Composite Complex Network Model.","authors":"Gengxin Sun","doi":"10.3390/e25101377","DOIUrl":"10.3390/e25101377","url":null,"abstract":"An urban public traffic network is a typical high-order complex network. There are multiple types of transportation in an urban public traffic network, and each type has different impacts on urban transportation. Robustness analyses of urban public traffic networks contribute to the safe maintenance and operation of urban traffic systems. In this paper, a new cascading failure model for urban public traffic networks is constructed based on a multi-subnet composite complex network model. In order to better simulate the actual traffic flow in the composite network, the concept of traffic function is proposed in the model. Considering the different effects of various relationships on nodes in the composite network, the traditional cascading failure model has been improved and a deliberate attack strategy and a random attack strategy have been adopted to study the robustness of the composite network. In the experiment, the urban bus-subway composite network in Qingdao, China, was used as an example for simulation. The experimental results showed that under two attack strategies, the network robustness did not increase with the increase in capacity, and the proportion of multiple relationships had a significant impact on the network robustness.","PeriodicalId":11694,"journal":{"name":"Entropy","volume":"25 10","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10606114/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61561664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Mathematical Modeling in Systems Biology. 系统生物学中的数学建模。

IF 2.7 3区物理与天体物理

Entropy Pub Date : 2023-09-25 DOI: 10.3390/e25101380

Pavel Kraikivski

引用次数: 0

A Monte Carlo Method for Calculating Lynden-Bell Equilibrium in Self-Gravitating Systems. 计算自引力系统Lynden-Bell平衡的蒙特卡罗方法。

IF 2.7 3区物理与天体物理

Entropy Pub Date : 2023-09-25 DOI: 10.3390/e25101379

Tarcísio N Teles, Calvin A F Farias, Renato Pakter, Yan Levin

{"title":"A Monte Carlo Method for Calculating Lynden-Bell Equilibrium in Self-Gravitating Systems.","authors":"Tarcísio N Teles, Calvin A F Farias, Renato Pakter, Yan Levin","doi":"10.3390/e25101379","DOIUrl":"10.3390/e25101379","url":null,"abstract":"We present a Monte Carlo approach that allows us to easily implement Lynden-Bell (LB) entropy maximization for an arbitrary initial particle distribution. The direct maximization of LB entropy for an arbitrary initial distribution requires an infinite number of Lagrange multipliers to account for the Casimir invariants. This has restricted studies of Lynden-Bell's violent relaxation theory to only a very small class of initial conditions of a very simple waterbag form, for which the entropy maximization can be performed numerically. In the present approach, an arbitrary initial distribution is discretized into density levels which are then evolved using an efficient Monte Carlo algorithm towards the final equilibrium state. A comparison is also made between the LB equilibrium and explicit Molecular Dynamics simulations. We find that for most initial distributions, relaxation is incomplete and the system is not able to reach the state of maximum LB entropy. In particular, we see that the tail of the stationary particle distribution is very different from the one predicted by the theory of violent relaxation, with a hard cutoff instead of an algebraic decay predicted by LB's theory.","PeriodicalId":11694,"journal":{"name":"Entropy","volume":"25 10","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10606548/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61561520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Improved Image Compression Algorithm Using 2D DWT and PCA with Canonical Huffman Encoding. 一种改进的基于二维离散小波变换和PCA的图像压缩算法。

IF 2.7 3区物理与天体物理

Entropy Pub Date : 2023-09-25 DOI: 10.3390/e25101382

Rajiv Ranjan, Prabhat Kumar

{"title":"An Improved Image Compression Algorithm Using 2D DWT and PCA with Canonical Huffman Encoding.","authors":"Rajiv Ranjan, Prabhat Kumar","doi":"10.3390/e25101382","DOIUrl":"10.3390/e25101382","url":null,"abstract":"Of late, image compression has become crucial due to the rising need for faster encoding and decoding. To achieve this objective, the present study proposes the use of canonical Huffman coding (CHC) as an entropy coder, which entails a lower decoding time compared to binary Huffman codes. For image compression, discrete wavelet transform (DWT) and CHC with principal component analysis (PCA) were combined. The lossy method was introduced by using PCA, followed by DWT and CHC to enhance compression efficiency. By using DWT and CHC instead of PCA alone, the reconstructed images have a better peak signal-to-noise ratio (PSNR). In this study, we also developed a hybrid compression model combining the advantages of DWT, CHC and PCA. With the increasing use of image data, better image compression techniques are necessary for the efficient use of storage space. The proposed technique achieved up to 60% compression while maintaining high visual quality. This method also outperformed the currently available techniques in terms of both PSNR (in dB) and bit-per-pixel (bpp) scores. This approach was tested on various color images, including Peppers 512 × 512 × 3 and Couple 256 × 256 × 3, showing improvements by 17 dB and 22 dB, respectively, while reducing the bpp by 0.56 and 0.10, respectively. For grayscale images as well, i.e., Lena 512 × 512 and Boat 256 × 256, the proposed method showed improvements by 5 dB and 8 dB, respectively, with a decrease of 0.02 bpp in both cases.","PeriodicalId":11694,"journal":{"name":"Entropy","volume":"25 10","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10606267/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61561538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing Visual Feedback Control through Early Fusion Deep Learning. 通过早期融合深度学习增强视觉反馈控制。

IF 2.7 3区物理与天体物理

Entropy Pub Date : 2023-09-25 DOI: 10.3390/e25101378

Adrian-Paul Botezatu, Lavinia-Eugenia Ferariu, Adrian Burlacu

{"title":"Enhancing Visual Feedback Control through Early Fusion Deep Learning.","authors":"Adrian-Paul Botezatu, Lavinia-Eugenia Ferariu, Adrian Burlacu","doi":"10.3390/e25101378","DOIUrl":"10.3390/e25101378","url":null,"abstract":"A visual servoing system is a type of control system used in robotics that employs visual feedback to guide the movement of a robot or a camera to achieve a desired task. This problem is addressed using deep models that receive a visual representation of the current and desired scene, to compute the control input. The focus is on early fusion, which consists of using additional information integrated into the neural input array. In this context, we discuss how ready-to-use information can be directly obtained from the current and desired scenes, to facilitate the learning process. Inspired by some of the most effective traditional visual servoing techniques, we introduce early fusion based on image moments and provide an extensive analysis of approaches based on image moments, region-based segmentation, and feature points. These techniques are applied stand-alone or in combination, to allow obtaining maps with different levels of detail. The role of the extra maps is experimentally investigated for scenes with different layouts. The results show that early fusion facilitates a more accurate approximation of the linear and angular camera velocities, in order to control the movement of a 6-degree-of-freedom robot from a current configuration to a desired one. The best results were obtained for the extra maps providing details of low and medium levels.","PeriodicalId":11694,"journal":{"name":"Entropy","volume":"25 10","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10606400/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61561611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Target Acquisition for Collimation System of Wireless Quantum Communication Networks in Low Visibility. 低能见度下无线量子通信网络准直系统的目标捕获。

IF 2.7 3区物理与天体物理

Entropy Pub Date : 2023-09-25 DOI: 10.3390/e25101381

Keyu Li, Tao Jiang, Yang Li, Xuemin Wang, Zhiqiang Zhan, Fengwei Chen, Zhengfu Han, Weidong Wu

{"title":"Target Acquisition for Collimation System of Wireless Quantum Communication Networks in Low Visibility.","authors":"Keyu Li, Tao Jiang, Yang Li, Xuemin Wang, Zhiqiang Zhan, Fengwei Chen, Zhengfu Han, Weidong Wu","doi":"10.3390/e25101381","DOIUrl":"10.3390/e25101381","url":null,"abstract":"In severe low-visibility environments full of smoke, because of the performance degeneration of the near-infrared (NIR) collimation system of quantum drones communication networks, the improved dual-threshold method based on trend line analysis for long-wave infrared (LWIR) quantum cascade lasers (QCLs) is proposed, to achieve target acquisition. The simulation results show that smoke-scattering noise is a steeply varying medium-high-frequency modulation. At particle sizes less than 4 μm, the traditional dual-threshold method can effectively distinguish the target information from the smoke noise, which is the advantage of the LWIR laser compared to the NIR laser. For detecting lasers with high signal-to-noise ratios (SNRs), the method can achieve good target acquisition, by setting reasonable conventional thresholds, such as 0.7 times the peak intensity and 0.8 times the peak rising velocity. At low SNRs and steep intensity variation, the method can also achieve good target acquisition, by adaptively resetting new thresholds after filtering the detecting laser, such as 0.6 times the peak intensity and 0.6 times the peak rising velocity. The results of this paper will provide a reference for the performance improvement and refinement of the collimation system for wireless quantum communication networks in low visibility.","PeriodicalId":11694,"journal":{"name":"Entropy","volume":"25 10","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10606033/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61561674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the Value of Chess Squares. 论国际象棋方块的价值。

IF 2.7 3区物理与天体物理

Entropy Pub Date : 2023-09-24 DOI: 10.3390/e25101374

Aditya Gupta, Shiva Maharaj, Nicholas Polson, Vadim Sokolov

引用次数: 1