Simulation-Transactions of the Society for Modeling and Simulation International最新文献_第5页

Investigating the effects of various control measures on economy and spread of COVID-19 in Turkey: a system dynamics approach. 调查各种控制措施对土耳其经济和COVID-19传播的影响:系统动力学方法。

IF 1.6 4区工程技术

Simulation-Transactions of the Society for Modeling and Simulation International Pub Date : 2023-02-01 DOI: 10.1177/00375497221116641

Muzaffer Alım, Saadettin Erhan Kesen

{"title":"Investigating the effects of various control measures on economy and spread of COVID-19 in Turkey: a system dynamics approach.","authors":"Muzaffer Alım, Saadettin Erhan Kesen","doi":"10.1177/00375497221116641","DOIUrl":"https://doi.org/10.1177/00375497221116641","url":null,"abstract":"<p><p>The coronavirus disease 2019 (COVID-19) which began in Wuhan in December 2019 has permeated all over the world in such a short time and was declared as a pandemic by World Health Organization (WHO). The pandemic that is erupting all of a sudden attracts the researchers to examine the spread and effects of the disease as well as the possible treatments and vaccine developments. In addition to the analytical models, such as compartmental modeling, Markov decision process, and so on, simulation and system dynamics (SD) are also widely applied in this field. In this study, we adopt the compartmental modeling stages to build an SD approach for the spread of the disease. A dynamic control measure decision support system (DSS) that varies depending on the number of daily cases is incorporated to the model. Furthermore, the economic loss in the gross domestic product (GDP) and workforce due to hospital stay and death caused by the COVID-19 are also investigated. The model is tested with various numerical parameters and the results are presented. The results on the spread of the disease and the associated economic loss provide meaningful insights into when control measures need to be imposed at which level. We also provide some policy insights, including some alternative policies, such as increasing awareness of people and vaccination in addition to control measures. The results reveal that the total number of cases and deaths is approximately 37% higher in the absence of dynamic DSS. However, everything comes at a price and applying such control measures brings about an increase in the economic loss about 47%.</p>","PeriodicalId":49516,"journal":{"name":"Simulation-Transactions of the Society for Modeling and Simulation International","volume":"99 2","pages":"113-125"},"PeriodicalIF":1.6,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9895299/pdf/10.1177_00375497221116641.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10666273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Computational fluid dynamics simulation of airborne COVID transmission in urban bus with different HVAC configurations 不同HVAC配置下城市客车空气传播的计算流体动力学仿真

IF 1.6 4区工程技术

Simulation-Transactions of the Society for Modeling and Simulation International Pub Date : 2023-01-28 DOI: 10.1177/00375497221151168

D. Ramajo, S. Corzo

{"title":"Computational fluid dynamics simulation of airborne COVID transmission in urban bus with different HVAC configurations","authors":"D. Ramajo, S. Corzo","doi":"10.1177/00375497221151168","DOIUrl":"https://doi.org/10.1177/00375497221151168","url":null,"abstract":"The HVAC systems in closed buses promote high particle spread. Lagrangian particle tracking simulations were carried out to evaluate airborne COVID transmission through droplets emitted by sneezing while Eulerian simulations were performed to account for the spread of aerosols emitted by breathing. The position of passengers as well as the effect of three HVAC configurations were evaluated. On one hand, it was concluded that large droplets can travel more than 3 m without being significantly affected by the inflow conditions, but small droplets are easily dispersed by the airflow, and many of them are captured by the HVAC systems. On the other hand, the HVAC systems quickly spreads aerosols along the whole of the bus, increasing the average risk for all passengers, but sensibly reducing the high local risks observed under motionless inflow conditions. The transmission risk was calculated by applying the Wells-Riley model, concluding that the transmission risk for a 20-min trip could remain below 0.5% if HVAC configurations with many inlet/outlet vents are implemented, and the passengers remain in silence and wear face masks.","PeriodicalId":49516,"journal":{"name":"Simulation-Transactions of the Society for Modeling and Simulation International","volume":"60 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85482051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Low-latency GNSS multipath simulation and building wall detection in urban environments 城市环境下低延迟GNSS多径仿真与建筑墙体检测

IF 1.6 4区工程技术

Simulation-Transactions of the Society for Modeling and Simulation International Pub Date : 2023-01-20 DOI: 10.1177/00375497221145601

Marcus O'Connor, T. Kersten, C. Skupin, Fabian Ruwisch, Le Ren, T. Wübbena, S. Schön

{"title":"Low-latency GNSS multipath simulation and building wall detection in urban environments","authors":"Marcus O'Connor, T. Kersten, C. Skupin, Fabian Ruwisch, Le Ren, T. Wübbena, S. Schön","doi":"10.1177/00375497221145601","DOIUrl":"https://doi.org/10.1177/00375497221145601","url":null,"abstract":"Precise navigation for fully autonomous driving—especially in dense urban areas—requires periodic precise position estimates. Global Navigation Satellite System (GNSS) technology has the potential to provide absolute positioning accuracy at a centimeter level. However, buildings in urban environments cause signal distortions and signal reflections—the so-called multipath—which are the most challenging parts in the GNSS error budget. Hence, we developed a scalable real-time multipath simulator for mitigating potential multipath receptions. The simulator uses three-dimensional (3D) building information, satellite, and user positions. The key drivers of latency are the calculation of reflection, diffraction, and line-of-sight, as well as the response time of the 3D building model database. The memory manager of the graphic processing units (GPUs) in combination with a dedicated load balancer enables fast and efficient multipath analysis. Selected case studies demonstrate the simulator’s potential to significantly improve the position accuracy of the processing engine. The use of the multipath simulator reduces the error in 61% of the error measurements in a stress test scenario to less than half of the non-multipath processing. The scalability of the simulator is demonstrated by combining the multipath simulator with a traffic simulator. Furthermore, we present a novel methodology for the detection of walls using GNSS signals to better account for incomplete or erroneous 3D building information in GNSS signal processing.","PeriodicalId":49516,"journal":{"name":"Simulation-Transactions of the Society for Modeling and Simulation International","volume":"212 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75077455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A formal GSPN model of a virtual doctor dialogue system 虚拟医生对话系统的形式化GSPN模型

IF 1.6 4区工程技术

Simulation-Transactions of the Society for Modeling and Simulation International Pub Date : 2023-01-18 DOI: 10.1177/00375497221147919

N. Bourbakis, S. Mallios

引用次数: 1

DP in ice environments—development of a dynamic positioning in ice validation platform (DPIVP) 冰环境下的DP——动态定位冰验证平台的开发

IF 1.6 4区工程技术

Simulation-Transactions of the Society for Modeling and Simulation International Pub Date : 2023-01-12 DOI: 10.1177/00375497221141463

Jason Mills, Mohammed Islam, Wayne Pearson, Bob Gash

{"title":"DP in ice environments—development of a dynamic positioning in ice validation platform (DPIVP)","authors":"Jason Mills, Mohammed Islam, Wayne Pearson, Bob Gash","doi":"10.1177/00375497221141463","DOIUrl":"https://doi.org/10.1177/00375497221141463","url":null,"abstract":"This paper presents the development of a dynamic positioning in ice validation platform (DPIVP) which is part of a larger research project aimed at developing dynamic positioning (DP) system technologies for ice-rich environments. One outcome is simulation software to aid research in this area. The DPIVP software was designed to realistically simulate the dynamics of ice-structure interactions for real-time applications and to validate components common to DP in ice simulations. The software consists of many components which the DPIVP ties together as a unified system. All components have well-defined interfaces. Many of them are also distributed, allowing execution on separate computers and/or CPUs which helps ensure real-time operation. These two characteristics also decreases coupling and encourages a more modular design with the benefit of easily substituting alternative component implementations without reprogramming the DPIVP. Alternate implementations are useful for conducting research in specific DP in ice areas without substantially changing the system, such as alternative ice force models, DP control algorithms, vessel models, 3D and 2D visualization, environment models, and data acquisition systems. The integrated system was tested and evaluated using unit testing, integration testing, and system testing. The completed system was also validated using test cases that match physical model tests; the results compared favorably. Although the software has some limitations, for example, validated ice-force models being limited to two vessels, and thus lacks the generality we wish, the end result is a working prototype that satisfies the research requirements and provides an architecture and framework for future development.","PeriodicalId":49516,"journal":{"name":"Simulation-Transactions of the Society for Modeling and Simulation International","volume":"130 1","pages":"621 - 641"},"PeriodicalIF":1.6,"publicationDate":"2023-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89275300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Stair/escalator/elevator selection behavior of passengers in subway stations based on the fuzzy logic theory 基于模糊逻辑理论的地铁车站乘客楼梯/自动扶梯/电梯选择行为

IF 1.6 4区工程技术

Simulation-Transactions of the Society for Modeling and Simulation International Pub Date : 2023-01-12 DOI: 10.1177/00375497221145645

Rui Zhang, Xiaoxia Yang, Meiqi Zhou, Yongxing Li, Xiaoli Yang

引用次数: 2

Proposal of a module-driven architecture for building simulation models devoted to container terminals: dilemmas in applying generic, flexible, and modular principles 模块驱动的集装箱码头仿真模型构建体系结构的建议:通用、灵活和模块化原则的应用困境

IF 1.6 4区工程技术

Simulation-Transactions of the Society for Modeling and Simulation International Pub Date : 2023-01-12 DOI: 10.1177/00375497221144646

Mohamed Nezar Abourraja, N. Kringos, S. Meijer

{"title":"Proposal of a module-driven architecture for building simulation models devoted to container terminals: dilemmas in applying generic, flexible, and modular principles","authors":"Mohamed Nezar Abourraja, N. Kringos, S. Meijer","doi":"10.1177/00375497221144646","DOIUrl":"https://doi.org/10.1177/00375497221144646","url":null,"abstract":"Container terminals are complex systems where containerized cargo undergoes a set of processing and handling operations to be delivered to their outgoing modes. A pool of decision support methods and simulation models has been developed to assist planners and managers in making decisions about daily operations. Nevertheless, most are designed for a particular terminal and not generic types. Indeed, a generic model serves as a conceptual factory to create specific models which greatly reduces the time and efforts of development; however, building such a model is no mean feat. To this aim, the paper on hand discusses the complexity of applying genericity, flexibility, and modularity in system modeling and proposes a generic architecture to build modular and flexible simulation models for container terminals. This architecture is split into a set of smaller, manageable, well-connected, and generic modules that facilitate the creation of highly parametrized specific models. An illustrative example of the architecture usage is presented in a case study, the new container terminal of Stockholm, and the resulting models were validated by subject matter experts. Finally, to prove its efficiency, a numerical study fed with real data is conducted to investigate the handling capacity of the studied system under different handling and flow scenarios. The obtained results show that the terminal handling capacity can be increased by around 50% if three to four more straddle carriers are added to the existing fleet.","PeriodicalId":49516,"journal":{"name":"Simulation-Transactions of the Society for Modeling and Simulation International","volume":"145 1","pages":"703 - 727"},"PeriodicalIF":1.6,"publicationDate":"2023-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86211290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Instance Segmentation for Occluded Particles 遮挡粒子的实例分割

IF 1.6 4区工程技术

Simulation-Transactions of the Society for Modeling and Simulation International Pub Date : 2023-01-01 DOI: 10.2172/1962045

Kyle Farmer, R. Cohn, Elizabeth Holm

引用次数: 0

Analysis on the evolution of frost heaving pressure of penetrating crack considering water content and migration 考虑含水率和运移的贯通裂缝冻胀压力演化分析

IF 1.6 4区工程技术

Simulation-Transactions of the Society for Modeling and Simulation International Pub Date : 2023-01-01 DOI: 10.1177/00375497221107935

Shengwen Zhang, Hang Lin, Yifan Chen, Yixian Wang, Yanlin Zhao

{"title":"Analysis on the evolution of frost heaving pressure of penetrating crack considering water content and migration","authors":"Shengwen Zhang, Hang Lin, Yifan Chen, Yixian Wang, Yanlin Zhao","doi":"10.1177/00375497221107935","DOIUrl":"https://doi.org/10.1177/00375497221107935","url":null,"abstract":"Frozen heaving failure of fractured rock mass is commonly encountered in engineering in cold regions, which is chiefly caused by the frost heaving pressure arising from the water–ice phase change in the crack. To explore the evolution of frost heaving pressure in penetrating elliptical crack considering water content and water migration, a new theoretical model embodying the frost heaving pressure evolutionary character was established by introducing freezing ratio function. The equivalent thermal expansion coefficient was used to analyze the evolution process of frost heaving pressure under the effect of water–ice phase change, which was then verified. It was found that the evolution process of frost heaving pressure can be divided into three stages: free expansion stage of water–ice phase change, rapid growth stage of frost heaving pressure, and stable stage of frost heaving pressure. Subsequently, the influences of rock thermal expansion effect, properties of rock and ice, and water content of crack on the frost heaving pressure were investigated. The results indicate that the impact of rock thermal expansion on frost heaving pressure is extremely slight, which is negligible. Comparing with the properties of rock, the properties of ice show significant effects on the frost heaving pressure, particularly the Poisson ratio of ice. In the case of identical water migration ratio, the peak frost heaving pressure increases linearly with the water content of crack.","PeriodicalId":49516,"journal":{"name":"Simulation-Transactions of the Society for Modeling and Simulation International","volume":"14 1","pages":"41 - 54"},"PeriodicalIF":1.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84646183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Particle filter–based data assimilation in dynamic data-driven simulation: sensitivity analysis of three critical experimental conditions 动态数据驱动仿真中基于粒子滤波的数据同化:三个关键实验条件的敏感性分析

IF 1.6 4区工程技术

Simulation-Transactions of the Society for Modeling and Simulation International Pub Date : 2022-12-26 DOI: 10.1177/00375497221143988

Yilin Huang, Xu Xie, Yubin Cho, A. Verbraeck

{"title":"Particle filter–based data assimilation in dynamic data-driven simulation: sensitivity analysis of three critical experimental conditions","authors":"Yilin Huang, Xu Xie, Yubin Cho, A. Verbraeck","doi":"10.1177/00375497221143988","DOIUrl":"https://doi.org/10.1177/00375497221143988","url":null,"abstract":"Data assimilation (DA) is a methodology widely used by different disciplines of science and engineering. It is typically applied to continuous systems with numerical models. The application of DA to discrete-event and discrete-time systems including agent-based models is relatively new. Because of its non-linearity and non-Gaussianity, the particle filter (PF) method is often a good option for stochastic simulation models of discrete systems. The probability distributions of model runs, however, make it computationally intensive. The experimental conditions therein are understudied. This paper studied three critical conditions of PF-based DA in a discrete event model: (1) the time interval between two consecutive DA iterations, (2) the number of particles, and (3) the actual level and perceived level of measurement errors (or noises). The study conducted identical-twin experiments of an M/M/1 single server queuing system. The ground truth is imitated in a stand-alone simulation model. The measurement errors are superimposed so that the effect of the three conditions can be quantitatively evaluated in a controlled manner. The results show that the estimation accuracy of such a system using PF is more constrained by the choice of time intervals than the number of particles. An under estimation of measurement errors produces worse state estimates than an over estimation of errors. A correct perception of the measurement errors does not guarantee better state estimates. Moreover, a slight over estimation of errors results in better state estimates, and it is more responsive to abrupt system changes than an accurate perception of measurement errors.","PeriodicalId":49516,"journal":{"name":"Simulation-Transactions of the Society for Modeling and Simulation International","volume":"91 1","pages":"403 - 415"},"PeriodicalIF":1.6,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74823464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0