WIT transactions on modelling and simulation最新文献_第6页

A Numerical Simulation of Electrical Resistivity of Fiber-Reinforced Composites, Part 1: Brittle Cementitious Concrete 纤维增强复合材料电阻率的数值模拟，第1部分:脆性水泥混凝土

WIT transactions on modelling and simulation Pub Date : 2022-03-17 DOI: 10.3390/modelling3010011

Alireza Miri, R. Ehsani, F. M. Tehrani

{"title":"A Numerical Simulation of Electrical Resistivity of Fiber-Reinforced Composites, Part 1: Brittle Cementitious Concrete","authors":"Alireza Miri, R. Ehsani, F. M. Tehrani","doi":"10.3390/modelling3010011","DOIUrl":"https://doi.org/10.3390/modelling3010011","url":null,"abstract":"The durability of concrete has a significant influence on the sustainability and resilience of various infrastructures, including buildings, bridges, roadways, dams, and other applications. Penetration of corrosive agents intensified by exposure to freeze-thaw cycles and the presence of early-age cracks is a common cause of reinforced concrete degradation. Electrical resistivity is a vital physical property of cementitious composites to assess the remained service life of reinforced concrete members subjected to corrosive ions attacks. The application of steel fibers reduces the vulnerability of concrete by limiting crack propagation, but complicates field and laboratory testing due to the random distribution of conductive fibers within the body of the concrete. Numerical simulations facilitate proper modeling of such random distribution to improve the reliability of testing measures. Hence, this paper investigates the influence of fiber reinforcement characteristics on electrical resistivity using multi-physics finite element models. Results examine modeling challenges and include insights on the sensitivity of resistivity measures to fiber reinforcement. Concluding remarks provide expected bias of electrical resistivity in the presence of steel fibers and endeavor to facilitate the development of practical guidelines for assessing the durability of fiber-reinforced concrete members using standard electrical resistivity testing procedures.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"130 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77976390","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

Theoretical Study of Some Angle Parameter Trigonometric Copulas 一些角参数三角关系式的理论研究

WIT transactions on modelling and simulation Pub Date : 2022-03-10 DOI: 10.3390/modelling3010010

C. Chesneau

引用次数: 8

On the Design of Composite Patch Repair for Strengthening of Marine Plates Subjected to Compressive Loads 船用板抗压加固复合修补设计研究

WIT transactions on modelling and simulation Pub Date : 2022-03-01 DOI: 10.3390/modelling3010009

Nikos Kallitsis, K. Anyfantis

{"title":"On the Design of Composite Patch Repair for Strengthening of Marine Plates Subjected to Compressive Loads","authors":"Nikos Kallitsis, K. Anyfantis","doi":"10.3390/modelling3010009","DOIUrl":"https://doi.org/10.3390/modelling3010009","url":null,"abstract":"Marine structures are susceptible to corrosion that accelerates material wastage. This phenomenon could lead to thickness reduction to the extent in which local buckling instabilities may occur. The majority of existing repair techniques require welding, which is a restricting factor in flammable environments where hot work is prohibited. A novel repair methodology that has attracted the research focus for over two decades is the adhesive bonding of a composite patch on a ship’s damaged plating. Although most studies have been focused on patch repair against crack propagation, restoring the initial buckling strength of corroded marine plates is of high interest. In this work, this technique is assessed using numerical experimentation through finite element analysis (FEA) with the patch’s dimensions as design parameters. The results are then evaluated using a design-of-experiments (DOE) approach by generating a response surface from central composite design (CCD) points. Applying this methodology to various plates and patches makes it possible to create a repair design procedure that specifies the minimum patch requirements depending on the metal substrate’s dimensions and corrosion realized.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90813434","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

Data Integration and Interoperability: Towards a Model-Driven and Pattern-Oriented Approach 数据集成和互操作性:迈向模型驱动和面向模式的方法

WIT transactions on modelling and simulation Pub Date : 2022-02-27 DOI: 10.3390/modelling3010008

R. Petrasch, Richard R. Petrasch

{"title":"Data Integration and Interoperability: Towards a Model-Driven and Pattern-Oriented Approach","authors":"R. Petrasch, Richard R. Petrasch","doi":"10.3390/modelling3010008","DOIUrl":"https://doi.org/10.3390/modelling3010008","url":null,"abstract":"Data integration is one of the core responsibilities of EDM (enterprise data management) and interoperability. It is essential for almost every digitalization project, e.g., during the migration from a legacy ERP (enterprise resource planning) software to a new system. One challenge is the incompatibility of data models, i.e., different software systems use specific or proprietary terminology, data structures, data formats, and semantics. Data need to be interchanged between software systems, and often complex data conversions or transformations are necessary. This paper presents an approach that allows software engineers or data experts to use models and patterns in order to specify data integration: it is based on data models such as ER (entity-relationship) diagrams or UML (unified modeling language) class models that are well-accepted and widely used in practice. Predefined data integration patterns are combined (applied) on the model level leading to formal, precise, and concise definitions of data transformations and conversions. Data integration definitions can then be executed (via code generation) so that a manual implementation is not necessary. The advantages are that existing data models can be reused, standardized data integration patterns lead to fast results, and data integration specifications are executable and can be easily maintained and extended. An example transformation of elements of a relational data model to object-oriented data structures shows the approach in practice. Its focus is on data mappings and relationships.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89698519","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: 7

Estimating the Benefits of Korea’s Intercity Rail Speed Increase Project: An Agent-Based Model Approach 韩国城际铁路提速项目的效益评估:基于代理的模型方法

WIT transactions on modelling and simulation Pub Date : 2022-01-30 DOI: 10.3390/modelling3010007

Chansung Kim, Heesub Rim, Dong-Kyu Oh, Dongwoon Kang

{"title":"Estimating the Benefits of Korea’s Intercity Rail Speed Increase Project: An Agent-Based Model Approach","authors":"Chansung Kim, Heesub Rim, Dong-Kyu Oh, Dongwoon Kang","doi":"10.3390/modelling3010007","DOIUrl":"https://doi.org/10.3390/modelling3010007","url":null,"abstract":"In the cost–benefit analysis of urban transportation investment, a logsum-based benefit calculation is widely used. However, it is rarely applied to inter-regional transportation. In this study, we applied a logsum-based approach to the calculation of benefits for high-speed projects for inter-regional railways in Korea’s long-term transportation plan. Moreover, we applied a behavioral model in which an agent travels beyond the zones assumed by an aggregate model. In the case of South Korea, such a model is important for determining transportation priorities: whether to specialize in mobility improvement by investing in a high-speed railway project, such as the 300 km/h Korea Train eXpress (KTX), or to improve existing facilities, such as by building a relatively slower railroad (150–250 km/h) to enhance existing mobility and accessibility. In this context, if a new, relatively slow railroad were constructed adjacent to a high-speed railroad, the benefits would be negligible since the reduction in travel time would not sufficiently reflect accessibility improvements. Therefore, this study proposes the use of aggregate and agent-based models to evaluate projects to improve intercity railway service and conduct a case study with the proposed new methodology. A logsum was selected to account for the benefits of passenger cars on semi-high-speed and high-speed railroads simultaneously since it has been widely used to estimate the benefits of new modes or relatively slow modes. To calculate the logsum, this study used input data from both the aggregate and individual agent-based models, and found that an analysis of the feasibility of inter-regional railroad investment was possible. Moreover, the agent-based model can also be applied to inter-regional analysis. The proposed methods are expected to enable a more comprehensive evaluation of the transport system. In the case of the agent-based model, it is suggested that further studies undertake more detailed scenario analysis and travel time estimation.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84808109","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

Acknowledgment to Reviewers of Modelling in 2021 向2021年建模审稿人致谢

WIT transactions on modelling and simulation Pub Date : 2022-01-30 DOI: 10.3390/modelling3010006

引用次数: 0

Modeling and Experimental Verification of Plasma Jet Electromagnetic Signals 等离子体射流电磁信号的建模与实验验证

WIT transactions on modelling and simulation Pub Date : 2022-01-27 DOI: 10.3390/modelling3010005

P. Drexler, Z. Szabó, R. Pernica, Jirí Zukal, Radim Kadlec, M. Klíma, P. Fiala

引用次数: 3

Derivation of the Optimal Solution for the Economic Production Quantity Model with Planned Shortages without Derivatives 无导数计划短缺经济产量模型最优解的推导

WIT transactions on modelling and simulation Pub Date : 2022-01-05 DOI: 10.3390/modelling3010004

Cenk Çalışkan

引用次数: 7

Simulation of Colloidal Stability and Aggregation Tendency of Magnetic Nanoflowers in Biofluids 磁性纳米花在生物流体中的胶体稳定性和聚集倾向的模拟

WIT transactions on modelling and simulation Pub Date : 2021-12-24 DOI: 10.3390/modelling3010002

P. Neofytou, M. Theodosiou, M. Krokidis, E. Efthimiadou

{"title":"Simulation of Colloidal Stability and Aggregation Tendency of Magnetic Nanoflowers in Biofluids","authors":"P. Neofytou, M. Theodosiou, M. Krokidis, E. Efthimiadou","doi":"10.3390/modelling3010002","DOIUrl":"https://doi.org/10.3390/modelling3010002","url":null,"abstract":"A population balance model for the aggregation of iron oxide nanoflowers (IONfs) is presented. The model is based on the fixed pivot technique and is validated successfully for four kinds of aggregation kernels. The extended Derjaguin, Landau, Verwey, and Overbeek (xDLVO) theory is also employed for assessing the collision efficiency of the particles, which is pertinent to the total energy of the interaction. Colloidal stability experiments were conducted on IONfs for two dispersant cases—aqueous phosphate buffered saline solution (PBS) and simulated body fluid (SBF). Dynamic light scattering (DLS) measurements after 24-h of incubation show a significant size increase in plain PBS, whereas the presence of proteins in SBF prevents aggregation by protein corona formation on the IONfs. Subsequent simulations tend to overpredict the aggregation rate, and this can be attributed to the flower-like shape of IONfs, thus allowing patchiness on the surface of the particles that promotes an uneven energy potential and aggregation hindering. In silico parametric study on the effects of the ionic strength shows a prominent dependency of the aggregation rate on the salinity of the dispersant underlying the effect of repulsion forces, which are almost absent in the PBS case, promoting aggregation. In addition, the parametric study on the van der Waals potential energy effect—within common Hamaker-constant values for iron oxides—shows that this is almost absent for high salinity dispersants, whereas low salinity gives a wide range of results, thus underlying the high sensitivity of the model on the potential energy parameters.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81170371","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

Modelling Key Performance Indicators in a Gamified Waste Management Tool 在游戏化废物管理工具中建立关键绩效指标模型

WIT transactions on modelling and simulation Pub Date : 2021-12-24 DOI: 10.3390/modelling3010003

G. Pappas, I. Papamichael, A. Zorpas, J. Siegel, Jacob Rutkowski, K. Politopoulos

{"title":"Modelling Key Performance Indicators in a Gamified Waste Management Tool","authors":"G. Pappas, I. Papamichael, A. Zorpas, J. Siegel, Jacob Rutkowski, K. Politopoulos","doi":"10.3390/modelling3010003","DOIUrl":"https://doi.org/10.3390/modelling3010003","url":null,"abstract":"Broader understanding of waste management has the potential to bring about broad societal change impacting the climate crisis and public health. We present existing waste management tools and commercially-available games involving waste management, highlighting the strengths and opportunities left unaddressed by these tools in educational contexts and planning use cases. A survey motivates the need for enhanced interactive tools providing clear feedback through quick-visibility performance indicators. After identifying an opportunity to build upon highly-detailed multi-criteria simulation tools, we explore the need for easy-to-read performance metrics that will bring to the field of waste management easily identifiable and measurable key performance indicators (KPIs) that vary alongside factors affecting waste management policies. Such metrics are introduced and detailed as part of a unified waste management model. We then develop a representative gamified educational tool based upon this model to be used by students, decision makers planning real-world policies, and the public. This simulator is built upon the Unity Game Engine and emulates waste management techniques and resulting KPIs within the context of a virtual city.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90458207","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: 26