Symmetry最新文献_第3页

Bi-Objective Circular Multi-Rail-Guided Vehicle Scheduling Optimization Considering Multi-Type Entry and Delivery Tasks: A Combined Genetic Algorithm and Symmetry Algorithm 考虑多类型进入和交付任务的双目标循环多轨道引导车辆调度优化：遗传算法与对称算法的结合

Symmetry Pub Date : 2024-09-13 DOI: 10.3390/sym16091205

Xinlin Li, Xuzhen Wu, Peipei Wang, Yalu Xu, Yue Gao, Yiyang Chen

引用次数: 0

Sparse Fuzzy C-Means Clustering with Lasso Penalty 带有 Lasso 惩罚的稀疏模糊 C-Means 聚类法

Symmetry Pub Date : 2024-09-13 DOI: 10.3390/sym16091208

Shazia Parveen, Miin-Shen Yang

{"title":"Sparse Fuzzy C-Means Clustering with Lasso Penalty","authors":"Shazia Parveen, Miin-Shen Yang","doi":"10.3390/sym16091208","DOIUrl":"https://doi.org/10.3390/sym16091208","url":null,"abstract":"Clustering is a technique of grouping data into a homogeneous structure according to the similarity or dissimilarity measures between objects. In clustering, the fuzzy c-means (FCM) algorithm is the best-known and most commonly used method and is a fuzzy extension of k-means in which FCM has been widely used in various fields. Although FCM is a good clustering algorithm, it only treats data points with feature components under equal importance and has drawbacks for handling high-dimensional data. The rapid development of social media and data acquisition techniques has led to advanced methods of collecting and processing larger, complex, and high-dimensional data. However, with high-dimensional data, the number of dimensions is typically immaterial or irrelevant. For features to be sparse, the Lasso penalty is capable of being applied to feature weights. A solution for FCM with sparsity is sparse FCM (S-FCM) clustering. In this paper, we propose a new S-FCM, called S-FCM-Lasso, which is a new type of S-FCM based on the Lasso penalty. The irrelevant features can be diminished towards exactly zero and assigned zero weights for unnecessary characteristics by the proposed S-FCM-Lasso. Based on various clustering performance measures, we compare S-FCM-Lasso with the S-FCM and other existing sparse clustering algorithms on several numerical and real-life datasets. Comparisons and experimental results demonstrate that, in terms of these performance measures, the proposed S-FCM-Lasso performs better than S-FCM and existing sparse clustering algorithms. This validates the efficiency and usefulness of the proposed S-FCM-Lasso algorithm for high-dimensional datasets with sparsity.","PeriodicalId":501198,"journal":{"name":"Symmetry","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

RETRACTED: Abdelmalek, Z.; Abdollahzadeh Jamalabadi, M.Y. Numerical Simulation of Micromixing of Particles and Fluids with Galloping Cylinder. Symmetry 2020, 12, 580 RETRACTED：Abdelmalek, Z.; Abdollahzadeh Jamalabadi, M.Y. Numerical Simulation of Micromixing of Particles and Fluids with Galloping Cylinder.Symmetry 2020, 12, 580

Symmetry Pub Date : 2024-09-13 DOI: 10.3390/sym16091204

Zahra Abdelmalek, Mohammad Yaghoub Abdollahzadeh Jamalabadi

引用次数: 0

Closed-Form Exact Solution for Free Vibration Analysis of Symmetric Functionally Graded Beams 对称功能梯度梁自由振动分析的闭式精确解法

Symmetry Pub Date : 2024-09-13 DOI: 10.3390/sym16091206

Lorenzo Ledda, Annalisa Greco, Ilaria Fiore, Ivo Caliò

引用次数: 0

Optimized Tool Motion Symmetry for Strip-Width-Max Mfg of Sculptured Surfaces with Non-Ball Tools Based on Envelope Approximation 基于包络近似法的非滚珠刀具带宽-最大值雕刻表面制造优化刀具运动对称性

Symmetry Pub Date : 2024-09-13 DOI: 10.3390/sym16091207

Kaihong Zhou, Haixu Liu, Shu Li

引用次数: 0

RETRACTED: Zhou, H.; Davarpanah, A. Hybrid Chemical Enhanced Oil Recovery Techniques: A Simulation Study. Symmetry 2020, 12, 1086 转载：Zhou, H.; Davarpanah, A. Hybrid Chemical Enhanced Oil Recovery Techniques：模拟研究。Symmetry 2020, 12, 1086

Symmetry Pub Date : 2024-09-13 DOI: 10.3390/sym16091203

Haiyan Zhou, Afshin Davarpanah

引用次数: 0

Hallucination Reduction and Optimization for Large Language Model-Based Autonomous Driving 基于大语言模型的自动驾驶的幻觉减少与优化

Symmetry Pub Date : 2024-09-11 DOI: 10.3390/sym16091196

Jue Wang

{"title":"Hallucination Reduction and Optimization for Large Language Model-Based Autonomous Driving","authors":"Jue Wang","doi":"10.3390/sym16091196","DOIUrl":"https://doi.org/10.3390/sym16091196","url":null,"abstract":"Large language models (LLMs) are widely integrated into autonomous driving systems to enhance their operational intelligence and responsiveness and improve self-driving vehicles’ overall performance. Despite these advances, LLMs still struggle between hallucinations—when models either misinterpret the environment or generate imaginary parts for downstream use cases—and taxing computational overhead that relegates their performance to strictly non-real-time operations. These are essential problems to solve to make autonomous driving as safe and efficient as possible. This work is thus focused on symmetrical trade-offs between the reduction of hallucination and optimization, leading to a framework for these two combined and at least specifically motivated by these limitations. This framework intends to generate a symmetry of mapping between real and virtual worlds. It helps in minimizing hallucinations and optimizing computational resource consumption reasonably. In autonomous driving tasks, we use multimodal LLMs that combine an image-encoding Visual Transformer (ViT) and a decoding GPT-2 with responses generated by the powerful new sequence generator from OpenAI known as GPT4. Our hallucination reduction and optimization framework leverages iterative refinement loops, RLHF—reinforcement learning from human feedback (RLHF)—along with symmetric performance metrics, e.g., BLEU, ROUGE, and CIDEr similarity scores between machine-generated answers specific to other human reference answers. This ensures that improvements in model accuracy are not overused to the detriment of increased computational overhead. Experimental results show a twofold improvement in decision-maker error rate and processing efficiency, resulting in an overall decrease of 30% for the model and a 25% improvement in processing efficiency across diverse driving scenarios. Not only does this symmetrical approach reduce hallucination, but it also better aligns the virtual and real-world representations.","PeriodicalId":501198,"journal":{"name":"Symmetry","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Editorial for the Special Issue of “Fractional Differential and Fractional Integro-Differential Equations: Qualitative Theory, Numerical Simulations, and Symmetry Analysis” 分数微分方程和分数积分微分方程》特刊编辑：定性理论、数值模拟和对称性分析" 特刊编辑

Symmetry Pub Date : 2024-09-11 DOI: 10.3390/sym16091193

Cemil Tunç, Jen-Chih Yao, Mouffak Benchohra, Ahmed M. A. El-Sayed

引用次数: 0

Dealing with Stationary Sinusoidal Responses of Seven Types of Multi-Fractional Vibrators Using Multi-Fractional Phasor 利用多分数相位处理七种多分数振动器的静态正弦响应

Symmetry Pub Date : 2024-09-11 DOI: 10.3390/sym16091197

Ming Li

{"title":"Dealing with Stationary Sinusoidal Responses of Seven Types of Multi-Fractional Vibrators Using Multi-Fractional Phasor","authors":"Ming Li","doi":"10.3390/sym16091197","DOIUrl":"https://doi.org/10.3390/sym16091197","url":null,"abstract":"The novelty and main contributions of this paper are reflected in four aspects. First, we introduce multi-fractional phasor in Theorem 1. Second, we propose the motion phasor equations of seven types of multi-fractional vibrators in Theorems 2, 12, 22, 32, 43, 54, and 65, respectively. Third, we present the analytical expressions of response phasors of seven types of multi-fractional vibrators in Theorems 10, 20, 30, 41, 52, 63, and 74, respectively. Fourth, we bring forward the analytical expressions of stationary sinusoidal responses of seven types of multi-fractional vibrators in Theorems 11, 21, 31, 42, 53, 64, and 75, respectively. In addition, by using multi-fractional phasor, we put forward the analytical expressions of vibration parameters (equivalent mass, equivalent damping, equivalent stiffness, equivalent damping ratio, equivalent damping free natural angular frequency, equivalent damped natural angular frequency, equivalent frequency ratio) and frequency transfer functions of seven types of multi-fractional vibrators. Demonstrations exhibit that the effects of multi-fractional orders on stationary sinusoidal responses of those multi-fractional vibrators are considerable.","PeriodicalId":501198,"journal":{"name":"Symmetry","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Study of the Neutron Skin of Nuclei with Dileptons in Nuclear Collisions 核碰撞中带有二价子的核的中子表皮研究

Symmetry Pub Date : 2024-09-11 DOI: 10.3390/sym16091195

Ke Xu, Baoyi Chen

引用次数: 0