WIT transactions on modelling and simulation最新文献_第3页

Development and Validation of a LabVIEW Automated Software System for Displacement and Dynamic Modal Parameters Analysis Purposes 基于位移与动态模态参数分析的LabVIEW自动化软件系统的开发与验证

WIT transactions on modelling and simulation Pub Date : 2023-04-28 DOI: 10.3390/modelling4020011

Reina El Dahr, X. Lignos, Spyridon Papavieros, I. Vayas

{"title":"Development and Validation of a LabVIEW Automated Software System for Displacement and Dynamic Modal Parameters Analysis Purposes","authors":"Reina El Dahr, X. Lignos, Spyridon Papavieros, I. Vayas","doi":"10.3390/modelling4020011","DOIUrl":"https://doi.org/10.3390/modelling4020011","url":null,"abstract":"The structural health monitoring (SHM) technique is a highly competent operative process dedicated to improving the resilience of an infrastructure by evaluating its system state. SHM is performed to identify any modification in the dynamic properties of an infrastructure by evaluating the acceleration, natural frequencies, and damping ratios. Apart from the vibrational measurements, SHM is employed to assess the displacement. Consequently, sensors are mounted on the investigated framework aiming to collect frequent readings at regularly spaced time intervals during and after being induced. In this study, a LabVIEW program was developed for vibrational monitoring and system evaluation. In a case study reported herein, it calculates the natural frequencies as well as the damping and displacement parameters of a cantilever steel beam after being subjected to excitation at its free end. For that purpose, a Bridge Diagnostic Inc. (BDI) accelerometer and a displacement transducer were parallelly mounted on the free end of the beam. The developed program was capable of detecting the eigenfrequencies, the damping properties, and the displacements from the acceleration data. The evaluated parameters were estimated with the ARTeMIS modal analysis software for comparison purposes. The reported response confirmed that the proposed system strongly conducted the desired performance as it successfully identified the system state and modal parameters.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"41 3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90470246","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: 1

Manuscripts Character Recognition Using Machine Learning and Deep Learning 使用机器学习和深度学习的手稿字符识别

WIT transactions on modelling and simulation Pub Date : 2023-04-04 DOI: 10.3390/modelling4020010

Mohammad Anwarul Islam, I. Iacob

{"title":"Manuscripts Character Recognition Using Machine Learning and Deep Learning","authors":"Mohammad Anwarul Islam, I. Iacob","doi":"10.3390/modelling4020010","DOIUrl":"https://doi.org/10.3390/modelling4020010","url":null,"abstract":"The automatic character recognition of historic documents gained more attention from scholars recently, due to the big improvements in computer vision, image processing, and digitization. While Neural Networks, the current state-of-the-art models used for image recognition, are very performant, they typically suffer from using large amounts of training data. In our study we manually built our own relatively small dataset of 404 characters by cropping letter images from a popular historic manuscript, the Electronic Beowulf. To compensate for the small dataset we use ImageDataGenerator, a Python library was used to augment our Beowulf manuscript’s dataset. The training dataset was augmented once, twice, and thrice, which we call resampling 1, resampling 2, and resampling 3, respectively. To classify the manuscript’s character images efficiently, we developed a customized Convolutional Neural Network (CNN) model. We conducted a comparative analysis of the results achieved by our proposed model with other machine learning (ML) models such as support vector machine (SVM), K-nearest neighbor (KNN), decision tree (DT), random forest (RF), and XGBoost. We used pretrained models such as VGG16, MobileNet, and ResNet50 to extract features from character images. We then trained and tested the above ML models and recorded the results. Moreover, we validated our proposed CNN model against the well-established MNIST dataset. Our proposed CNN model achieves very good recognition accuracies of 88.67%, 90.91%, and 98.86% in the cases of resampling 1, resampling 2, and resampling 3, respectively, for the Beowulf manuscript’s data. Additionally, our CNN model achieves the benchmark recognition accuracy of 99.03% for the MNIST dataset.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"100 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81388992","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: 2

Traceability Management of Socio-Cyber-Physical Systems Involving Goal and SysML Models 涉及目标和SysML模型的社会-网络-物理系统的可追溯性管理

WIT transactions on modelling and simulation Pub Date : 2023-03-30 DOI: 10.3390/modelling4020009

A. Anda, Daniel Amyot, J. Mylopoulos

{"title":"Traceability Management of Socio-Cyber-Physical Systems Involving Goal and SysML Models","authors":"A. Anda, Daniel Amyot, J. Mylopoulos","doi":"10.3390/modelling4020009","DOIUrl":"https://doi.org/10.3390/modelling4020009","url":null,"abstract":"Socio-cyber-physical systems (SCPSs) have emerged as networked heterogeneous systems that incorporate social components (e.g., business processes and social networks) along with physical (e.g., Internet-of-Things devices) and software components. Model-driven techniques for building SCPSs need actor and goal models to capture social concerns, whereas system issues are often addressed with the Systems Modeling Language (SysML). Comprehensive traceability between these types of models is essential to support consistency and completeness checks, change management, and impact analysis. However, traceability management between these complementary views is not well supported across SysML tools, particularly when models evolve because SysML does not provide sophisticated out-of-the-box goal modeling capabilities. In our previous work, we proposed a model-based framework, called CGS4Adaptation, that supports basic traceability by importing goal and SysML models into a leading third-party requirement-management system, namely IBM Rational DOORS. In this paper, we present the framework’s traceability management method and its use for automated consistency and completeness checks. Traceability management also includes implicit link detection, thereby, improving the quality of traceability links while better aligning designs with requirements. The method is evaluated using an adaptive SCPS case study involving an IoT-based smart home. The results suggest that the tool-supported method is effective and useful in supporting the traceability management process involving complex goal and SysML models in one environment while saving development time and effort.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75222040","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

Theoretical Advancements on a Few New Dependence Models Based on Copulas with an Original Ratio Form 基于原始比率形式的copula的几种新的依赖模型的理论进展

WIT transactions on modelling and simulation Pub Date : 2023-03-29 DOI: 10.3390/modelling4020008

C. Chesneau

{"title":"Theoretical Advancements on a Few New Dependence Models Based on Copulas with an Original Ratio Form","authors":"C. Chesneau","doi":"10.3390/modelling4020008","DOIUrl":"https://doi.org/10.3390/modelling4020008","url":null,"abstract":"Copulas are well-known tools for describing the relationship between two or more quantitative variables. They have recently received a lot of attention, owing to the variable dependence complexity that appears in heterogeneous modern problems. In this paper, we offer five new copulas based on a common original ratio form. All of them are defined with a single tuning parameter, and all reduce to the independence copula when this parameter is equal to zero. Wide admissible domains for this parameter are established, and the mathematical developments primarily rely on non-trivial limits, two-dimensional differentiations, suitable factorizations, and mathematical inequalities. The corresponding functions and characteristics of the proposed copulas are looked at in some important details. In particular, as common features, it is shown that they are diagonally symmetric, but not Archimedean, not radially symmetric, and without tail dependence. The theory is illustrated with numerical tables and graphics. A final part discusses the multi-dimensional variation of our original ratio form. The contributions are primarily theoretical, but they provide the framework for cutting-edge dependence models that have potential applications across a wide range of fields. Some established two-dimensional inequalities may be of interest beyond the purposes of this paper.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76586703","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: 2

Hybrid Finite-Discrete Element Modeling of the Mode I Tensile Response of an Alumina Ceramic 氧化铝陶瓷I型拉伸响应的有限元-离散混合模型

WIT transactions on modelling and simulation Pub Date : 2023-03-13 DOI: 10.3390/modelling4010007

Jie Zheng, Haoyang Li, J. Hogan

引用次数: 0

Nonlinear Modeling of an Automotive Air Conditioning System Considering Active Grille Shutters 考虑主动格栅百叶窗的汽车空调系统非线性建模

WIT transactions on modelling and simulation Pub Date : 2023-02-02 DOI: 10.3390/modelling4010006

Trevor Parent, J. Defoe, Afshin Rahimi

{"title":"Nonlinear Modeling of an Automotive Air Conditioning System Considering Active Grille Shutters","authors":"Trevor Parent, J. Defoe, Afshin Rahimi","doi":"10.3390/modelling4010006","DOIUrl":"https://doi.org/10.3390/modelling4010006","url":null,"abstract":"This paper expands upon the state of the art in nonlinear modeling of automotive air conditioning systems. Prior models considered only the effects of the refrigerant compressor and the condenser fan. There are two new aspects included here. First, we create a mathematical model for front-end underhood airflow, considering vehicle speed, condenser fan rotational speed, and active grille shutter position. In addition, we present a new model for the power consumption of the vehicle associated with aerodynamic drag caused by underhood flow, as well as a fan power model which accounts not only for changes in rotational speed but also changes in flow rate. The models developed in this paper are coded in MATLAB/Simulink and assessed for various vehicle driving conditions against a higher-fidelity vehicle energy management model, showing good agreement. By including the active grille shutters as a controllable actuator and the impact of underhood flow on vehicle drag and fan power consumption, control schemes can be developed to holistically target reduced energy consumption for the air conditioning system and, thus, improve the overall vehicle energy efficiency.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"56 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89350757","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

Off-Design Analysis Method for Compressor Fouling Fault Diagnosis of Helicopter Turboshaft Engine 直升机涡轮轴发动机压缩机污垢故障诊断的非设计分析方法

WIT transactions on modelling and simulation Pub Date : 2023-01-28 DOI: 10.3390/modelling4010005

Farshid Bazmi, Afshin Rahimi

引用次数: 0

Machine Learning Methods for Diabetes Prevalence Classification in Saudi Arabia 沙特阿拉伯糖尿病患病率分类的机器学习方法

WIT transactions on modelling and simulation Pub Date : 2023-01-25 DOI: 10.3390/modelling4010004

Entissar S. Almutairi, M. Abbod

{"title":"Machine Learning Methods for Diabetes Prevalence Classification in Saudi Arabia","authors":"Entissar S. Almutairi, M. Abbod","doi":"10.3390/modelling4010004","DOIUrl":"https://doi.org/10.3390/modelling4010004","url":null,"abstract":"Machine learning algorithms have been widely used in public health for predicting or diagnosing epidemiological chronic diseases, such as diabetes mellitus, which is classified as an epi-demic due to its high rates of global prevalence. Machine learning techniques are useful for the processes of description, prediction, and evaluation of various diseases, including diabetes. This study investigates the ability of different classification methods to classify diabetes prevalence rates and the predicted trends in the disease according to associated behavioural risk factors (smoking, obesity, and inactivity) in Saudi Arabia. Classification models for diabetes prevalence were developed using different machine learning algorithms, including linear discriminant (LD), support vector machine (SVM), K -nearest neighbour (KNN), and neural network pattern recognition (NPR). Four kernel functions of SVM and two types of KNN algorithms were used, namely linear SVM, Gaussian SVM, quadratic SVM, cubic SVM, fine KNN, and weighted KNN. The performance evaluation in terms of the accuracy of each developed model was determined, and the developed classifiers were compared using the Classification Learner App in MATLAB, according to prediction speed and training time. The experimental results on the predictive performance analysis of the classification models showed that weighted KNN performed well in the prediction of diabetes prevalence rate, with the highest average accuracy of 94.5% and less training time than the other classification methods, for both men and women datasets.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78506338","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: 3

Acknowledgment to the Reviewers of Modelling in 2022 对2022年建模评审人员的感谢

WIT transactions on modelling and simulation Pub Date : 2023-01-18 DOI: 10.3390/modelling4010003

引用次数: 0

IndShaker: A Knowledge-Based Approach to Enhance Multi-Perspective System Dynamics Analysis IndShaker:一种基于知识的方法来增强多视角系统动力学分析

WIT transactions on modelling and simulation Pub Date : 2022-12-23 DOI: 10.3390/modelling4010002

S. F. Pileggi

{"title":"IndShaker: A Knowledge-Based Approach to Enhance Multi-Perspective System Dynamics Analysis","authors":"S. F. Pileggi","doi":"10.3390/modelling4010002","DOIUrl":"https://doi.org/10.3390/modelling4010002","url":null,"abstract":"Decision making as a result of system dynamics analysis requires, in practice, a straightforward and systematic modeling capability as well as a high-level of customization and flexibility to adapt to situations and environments that may vary very much from each other. While in general terms a completely generic approach could be not as effective as ad hoc solutions, the proper application of modern technology may facilitate agile strategies as a result of a smart combination of qualitative and quantitative aspects. In order to address such complexity, we propose a knowledge-based approach that integrates the systematic computation of heterogeneous criteria with open semantics. The holistic understanding of the framework is described by a reference architecture and the proof-of-concept prototype developed can support high-level system analysis, as well as being suitable within a number of applications contexts—i.e., as a research/educational tool, communication framework, gamification and participatory modeling. Additionally, the knowledge-based philosophy, developed upon Semantic Web technology, increases the capability in terms of holistic knowledge building and re-use via interoperability. Last but not least, the framework is designed to constantly evolve in the next future, for instance by incorporating more advanced AI-powered features.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80232564","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