Pub Date : 2024-05-06DOI: 10.1177/00375497241249181
Levent Yilmaz
This paper highlights the renewal and restructuring period for SIMULATION: Transactions of the Society for Modeling and Simulation (SCS) between 2008 and 2016. Following a retrospective review of the author’s formative years, evolving research interests, and continuing academic journey, the rationale for reorganizing the journal is examined in the context of the evolving professional realm of Modeling and Simulation (M&S). The alignment of the profession, developments in the broader M&S domain, and related SCS initiatives are discussed. The simulation discipline is viewed as a dynamic adaptive innovation ecosystem that brings the principles of the science of complexity to bear on the challenges to its resilience and vitality. The innovation dynamics and complexity perspectives imply future aspirations for the M&S discipline based on recent technological advancements, emerging trends in the scientific culture, and evolving societal demands.
{"title":"A retrospective review and reflection on the alignment of SIMULATION with the evolving professional realm of Modeling and Simulation","authors":"Levent Yilmaz","doi":"10.1177/00375497241249181","DOIUrl":"https://doi.org/10.1177/00375497241249181","url":null,"abstract":"This paper highlights the renewal and restructuring period for SIMULATION: Transactions of the Society for Modeling and Simulation (SCS) between 2008 and 2016. Following a retrospective review of the author’s formative years, evolving research interests, and continuing academic journey, the rationale for reorganizing the journal is examined in the context of the evolving professional realm of Modeling and Simulation (M&S). The alignment of the profession, developments in the broader M&S domain, and related SCS initiatives are discussed. The simulation discipline is viewed as a dynamic adaptive innovation ecosystem that brings the principles of the science of complexity to bear on the challenges to its resilience and vitality. The innovation dynamics and complexity perspectives imply future aspirations for the M&S discipline based on recent technological advancements, emerging trends in the scientific culture, and evolving societal demands.","PeriodicalId":501452,"journal":{"name":"SIMULATION","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140888495","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}
Pub Date : 2024-05-06DOI: 10.1177/00375497241247555
Shiqing Zhang, Mingguang Zhang, Yun Cao
With the increasing demand for research on hazardous chemicals in high-rise research and development (R&D) buildings, the use of a large number of flammable chemicals increases the fire risk significantly. Therefore, the research on the storage of hazardous chemicals in high-rise R&D buildings becomes more and more important. This paper presents a maximum dynamic design method for hazardous chemical storage. A set of fire risk indicators has been established in the research, including temperature, carbon monoxide concentration, and visibility. The representative hazardous chemicals are selected through the investigation of the distribution and quantity of hazardous chemicals. Through numerical simulation of high-rise building fire with different stocks of dangerous chemicals and evacuation simulation of different fire floors, the time when the risk factors of fire occurrence reach the critical threshold of human body (ASET) and the necessary time for human evacuation (RSET) are obtained. By adjusting the amount of hazardous chemicals stored, the time to reach the hazardous critical threshold (RSET) and the time to evacuate (ASET) are changed accordingly. When RSET < ASET, the storage capacity of hazardous chemicals in the high-rise R&D building meets the target requirements. In the case study, ethanol was selected as the representative substance, and numerical simulation and example calculation were carried out on a 16-story R&D building. The amount of ethanol stored on each floor was calculated. Among them, the eighth layer has the largest ethanol storage capacity (1.81 L/m2) and the ninth layer has the smallest ethanol storage capacity (0.89 L/m2).
随着高层研发（R&D）建筑中危险化学品研究需求的不断增加，大量易燃化学品的使用大大增加了火灾风险。因此，研究高层研发大楼中危险化学品的存储问题变得越来越重要。本文提出了一种危险化学品储存的最大动态设计方法。研究建立了一套火灾风险指标，包括温度、一氧化碳浓度和能见度。通过对危险化学品分布和数量的调查，选择了具有代表性的危险化学品。通过对不同危险化学品存量的高层建筑火灾进行数值模拟，并对不同着火楼层进行疏散模拟，得出火灾发生风险因素达到人体临界阈值的时间（ASET）和人体疏散所需时间（RSET）。通过调整危险化学品的储存量，达到危险临界阈值的时间（RSET）和人员疏散的时间（ASET）也会相应改变。当 RSET < ASET 时，高层研发大楼的危险化学品储存能力就能满足目标要求。案例研究选择了乙醇作为代表物质，并对一栋 16 层的研发大楼进行了数值模拟和实例计算。计算了每一层的乙醇存储量。其中，第八层的乙醇储存量最大（1.81 升/平方米），第九层的乙醇储存量最小（0.89 升/平方米）。
{"title":"Dynamic design of hazardous chemical storage in high-rise R&D building based on numerical simulation","authors":"Shiqing Zhang, Mingguang Zhang, Yun Cao","doi":"10.1177/00375497241247555","DOIUrl":"https://doi.org/10.1177/00375497241247555","url":null,"abstract":"With the increasing demand for research on hazardous chemicals in high-rise research and development (R&D) buildings, the use of a large number of flammable chemicals increases the fire risk significantly. Therefore, the research on the storage of hazardous chemicals in high-rise R&D buildings becomes more and more important. This paper presents a maximum dynamic design method for hazardous chemical storage. A set of fire risk indicators has been established in the research, including temperature, carbon monoxide concentration, and visibility. The representative hazardous chemicals are selected through the investigation of the distribution and quantity of hazardous chemicals. Through numerical simulation of high-rise building fire with different stocks of dangerous chemicals and evacuation simulation of different fire floors, the time when the risk factors of fire occurrence reach the critical threshold of human body (ASET) and the necessary time for human evacuation (RSET) are obtained. By adjusting the amount of hazardous chemicals stored, the time to reach the hazardous critical threshold (RSET) and the time to evacuate (ASET) are changed accordingly. When RSET < ASET, the storage capacity of hazardous chemicals in the high-rise R&D building meets the target requirements. In the case study, ethanol was selected as the representative substance, and numerical simulation and example calculation were carried out on a 16-story R&D building. The amount of ethanol stored on each floor was calculated. Among them, the eighth layer has the largest ethanol storage capacity (1.81 L/m<jats:sup>2</jats:sup>) and the ninth layer has the smallest ethanol storage capacity (0.89 L/m<jats:sup>2</jats:sup>).","PeriodicalId":501452,"journal":{"name":"SIMULATION","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140888156","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}
Pub Date : 2024-04-28DOI: 10.1177/00375497241247040
Severin Vianey Tuekam Kakeu, Eric Fotsing, Eric Desire Kameni, Marcellin Julius Antonio Nkenlifack
This paper presents a new cognitive agent design approach integrating spatial knowledge representation and reasoning in agent-based modeling dedicated to land use simulations. A deep motivation for our agent-centric contribution is the ever-increasing development of spatially explicit agent simulation platforms. We build on this technological evolution and topology theory to endow the agent with human’s spatial representation and reasoning following a Belief–Desire–Intention architecture. A pilot implementation of the methodology with simulation experiments on a hunting model was carried out in GAMA platform to assess agent performances. Simulations display a consistent trend of animal population dynamics and also confirm a high model sensitivity to the integration of spatial knowledge and reasoning in agent-based models of human actor. These results demonstrate a successful implementation and the importance of spatial dimension in the expressive power and the validity of agent-based models. Future research efforts should therefore emphasize on designing human knowledge representation and incorporating learning abilities to improve models efficiency.
{"title":"An agent architecture for expressive spatial knowledge and reasoning in land use modeling and simulations","authors":"Severin Vianey Tuekam Kakeu, Eric Fotsing, Eric Desire Kameni, Marcellin Julius Antonio Nkenlifack","doi":"10.1177/00375497241247040","DOIUrl":"https://doi.org/10.1177/00375497241247040","url":null,"abstract":"This paper presents a new cognitive agent design approach integrating spatial knowledge representation and reasoning in agent-based modeling dedicated to land use simulations. A deep motivation for our agent-centric contribution is the ever-increasing development of spatially explicit agent simulation platforms. We build on this technological evolution and topology theory to endow the agent with human’s spatial representation and reasoning following a Belief–Desire–Intention architecture. A pilot implementation of the methodology with simulation experiments on a hunting model was carried out in GAMA platform to assess agent performances. Simulations display a consistent trend of animal population dynamics and also confirm a high model sensitivity to the integration of spatial knowledge and reasoning in agent-based models of human actor. These results demonstrate a successful implementation and the importance of spatial dimension in the expressive power and the validity of agent-based models. Future research efforts should therefore emphasize on designing human knowledge representation and incorporating learning abilities to improve models efficiency.","PeriodicalId":501452,"journal":{"name":"SIMULATION","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140811515","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}
Pub Date : 2024-04-28DOI: 10.1177/00375497241247039
Rui A S Moreira, André P Marques
Passive damping treatments using viscoelastic materials (VEMs) are widely applied as addon solutions to control the dynamic response of light structures. These surface treatments are simple, reliable, and can be optimized by using proper design rules and simulation tools. In this work, a new treatment configuration is proposed, simulated, and assessed, being compared with the most effective configuration currently used. The novelty resides in the VEM layer’s geometry, which in the proposed configuration assumes a waved shape. This waved shape is imposed to the viscoelastic layer due to indentations created in the inner faces of the host structure and the constraining layer. The results demonstrate that the wavy configuration, designated as corrugated viscoelastic layer (CVL), outperforms the typical damping treatments for relatively thick host structures and when using thick VEM layers. In addition, this new configuration reduces the stiffness decoupling effect due to the soft VEM layer, restoring the flexural stiffness of the original undamped structure.
{"title":"Simulation on dynamic passive control of structures using corrugated viscoelastic damping treatments","authors":"Rui A S Moreira, André P Marques","doi":"10.1177/00375497241247039","DOIUrl":"https://doi.org/10.1177/00375497241247039","url":null,"abstract":"Passive damping treatments using viscoelastic materials (VEMs) are widely applied as addon solutions to control the dynamic response of light structures. These surface treatments are simple, reliable, and can be optimized by using proper design rules and simulation tools. In this work, a new treatment configuration is proposed, simulated, and assessed, being compared with the most effective configuration currently used. The novelty resides in the VEM layer’s geometry, which in the proposed configuration assumes a waved shape. This waved shape is imposed to the viscoelastic layer due to indentations created in the inner faces of the host structure and the constraining layer. The results demonstrate that the wavy configuration, designated as corrugated viscoelastic layer (CVL), outperforms the typical damping treatments for relatively thick host structures and when using thick VEM layers. In addition, this new configuration reduces the stiffness decoupling effect due to the soft VEM layer, restoring the flexural stiffness of the original undamped structure.","PeriodicalId":501452,"journal":{"name":"SIMULATION","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140811620","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}
Pub Date : 2024-04-15DOI: 10.1177/00375497241239360
Erika Frydenlund, Joseph Martínez, Jose J Padilla, Katherine Palacio, David Shuttleworth
We examine the potential of prompting a large language model-based chatbot, ChatGPT, to generate functional simulation model code from a prose-based narrative. The simple narrative describes how the mode of transportation for elementary school students changed due to the COVID-19 pandemic and related factors, including a lack of available bus drivers, lack of mask enforcement on buses, and inclement weather. We document the process of providing this narrative to ChatGPT and further prompting the chatbot to generate model code to represent the narrative and to make it executable. We test ChatGPT’s ability to use prose descriptions of a phenomenon to generate simulation models using three paradigms: discrete event system, system dynamics, and agent-based modeling. Our findings reveal that ChatGPT could not produce concise or executable models, facing higher difficulty when asked to do so in programming languages it was less familiar with. This analysis underscores the strengths and limitations of the current state of this technology for modeling and simulation. Furthermore, we propose how future advancements in Large Language Models may aid the simulation modeling process, increasing transparency and participation in multidisciplinary team efforts.
{"title":"Modeler in a box: how can large language models aid in the simulation modeling process?","authors":"Erika Frydenlund, Joseph Martínez, Jose J Padilla, Katherine Palacio, David Shuttleworth","doi":"10.1177/00375497241239360","DOIUrl":"https://doi.org/10.1177/00375497241239360","url":null,"abstract":"We examine the potential of prompting a large language model-based chatbot, ChatGPT, to generate functional simulation model code from a prose-based narrative. The simple narrative describes how the mode of transportation for elementary school students changed due to the COVID-19 pandemic and related factors, including a lack of available bus drivers, lack of mask enforcement on buses, and inclement weather. We document the process of providing this narrative to ChatGPT and further prompting the chatbot to generate model code to represent the narrative and to make it executable. We test ChatGPT’s ability to use prose descriptions of a phenomenon to generate simulation models using three paradigms: discrete event system, system dynamics, and agent-based modeling. Our findings reveal that ChatGPT could not produce concise or executable models, facing higher difficulty when asked to do so in programming languages it was less familiar with. This analysis underscores the strengths and limitations of the current state of this technology for modeling and simulation. Furthermore, we propose how future advancements in Large Language Models may aid the simulation modeling process, increasing transparency and participation in multidisciplinary team efforts.","PeriodicalId":501452,"journal":{"name":"SIMULATION","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140600650","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}
Pub Date : 2024-04-05DOI: 10.1177/00375497241240003
Jingxuan Peng, Zhonghua Wei, Jiaye Li, Xiangfei Guo, Shaofan Wang
The impact of large passenger flow during peak hours causes serious congestion in subway stations, and passenger flow bottlenecks appear in many places, which affects travel efficiency and safety. How to eliminate the bottlenecks is an urgent problem to be solved. In this paper, we first analyze the causes and regions of bottlenecks, and we propose three decongestion solutions: (a) moving the security check machines from the station hall to the entrance channel; (b) adding isolation belts in front of the area of escalators; and (c) separating opposite passengers flow by using isolation belts. We conduct a case study on Guomao Station, Beijing, China to verify the effectiveness of the solutions. Specifically, we establish a microscopic model to simulate the passenger flow in a subway station, and the simulation results show that decongestion solutions can reduce the queueing length of security bottleneck by more than 30%, while decreasing the passenger density in non-paying areas of the station hall by more than 50%. The decongestion solutions proposed in this paper can eliminate the bottlenecks in subway stations effectively and practicably.
{"title":"Passenger flow bottleneck decongestion in subway stations: a simulation study","authors":"Jingxuan Peng, Zhonghua Wei, Jiaye Li, Xiangfei Guo, Shaofan Wang","doi":"10.1177/00375497241240003","DOIUrl":"https://doi.org/10.1177/00375497241240003","url":null,"abstract":"The impact of large passenger flow during peak hours causes serious congestion in subway stations, and passenger flow bottlenecks appear in many places, which affects travel efficiency and safety. How to eliminate the bottlenecks is an urgent problem to be solved. In this paper, we first analyze the causes and regions of bottlenecks, and we propose three decongestion solutions: (a) moving the security check machines from the station hall to the entrance channel; (b) adding isolation belts in front of the area of escalators; and (c) separating opposite passengers flow by using isolation belts. We conduct a case study on Guomao Station, Beijing, China to verify the effectiveness of the solutions. Specifically, we establish a microscopic model to simulate the passenger flow in a subway station, and the simulation results show that decongestion solutions can reduce the queueing length of security bottleneck by more than 30%, while decreasing the passenger density in non-paying areas of the station hall by more than 50%. The decongestion solutions proposed in this paper can eliminate the bottlenecks in subway stations effectively and practicably.","PeriodicalId":501452,"journal":{"name":"SIMULATION","volume":"66 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140600868","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}
Pub Date : 2024-04-03DOI: 10.1177/00375497241241340
Daniel Alves, Katia Obraczka, Abdul Kabbani
To help meet the ever-increasing demand for cloud computing services and resources worldwide, while providing resilience and adequate resource utilization, cloud service providers have opted to distribute their data centers around the world. This trend has been motivating research from the data center management research and practitioner community on new job schedulers that take into account data center geographical distribution. However, testing and benchmarking new schedulers for geo-distributed data centers is complicated by the lack of a common, easily extensible experimental platform. To fill this gap, we propose GDSim, an open-source, extensible job scheduling simulation environment for geo-distributed data centers that aims at facilitating the benchmarking of existing and new geo-distributed schedulers by subjecting them to a variety of data center features and conditions We use our geo-distributed job scheduler simulation platform to reproduce experiments and results for recently proposed geo-distributed job schedulers, as well as testing those schedulers under new conditions which can reveal trends that have not been previously uncovered.
{"title":"An open-source simulation platform for benchmarking geo-distributed data center schedulers","authors":"Daniel Alves, Katia Obraczka, Abdul Kabbani","doi":"10.1177/00375497241241340","DOIUrl":"https://doi.org/10.1177/00375497241241340","url":null,"abstract":"To help meet the ever-increasing demand for cloud computing services and resources worldwide, while providing resilience and adequate resource utilization, cloud service providers have opted to distribute their data centers around the world. This trend has been motivating research from the data center management research and practitioner community on new job schedulers that take into account data center geographical distribution. However, testing and benchmarking new schedulers for geo-distributed data centers is complicated by the lack of a common, easily extensible experimental platform. To fill this gap, we propose GDSim, an open-source, extensible job scheduling simulation environment for geo-distributed data centers that aims at facilitating the benchmarking of existing and new geo-distributed schedulers by subjecting them to a variety of data center features and conditions We use our geo-distributed job scheduler simulation platform to reproduce experiments and results for recently proposed geo-distributed job schedulers, as well as testing those schedulers under new conditions which can reveal trends that have not been previously uncovered.","PeriodicalId":501452,"journal":{"name":"SIMULATION","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140601243","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}
Pub Date : 2024-04-02DOI: 10.1177/00375497241238025
Lincan Qin, Zhiwei You, Bo Liu, Chunmei Luo
Objective:A virtual reality (VR)-based training system for combat musculoskeletal trauma care (CMTC) was meticulously crafted to enhance trainees’ theoretical understanding, familiarity with care processes, and decision-making abilities in the realm of combat musculoskeletal trauma management.Method:Scenario scripts, descriptions of injuries, and foundational management plans for care under fire and tactical field care were constructed. Subsequently, the CMTC system was developed employing tools, such as Maya, Photoshop, Unity, SQLite, and Visual Studio. Finally, the system was tested by 30 civilian nurses. The trainees’ knowledge, satisfaction, and system usability were evaluated using the theoretical question bank module, questionnaire, and system usability scale (SUS).Results:This research resulted in the establishment of five types of processes for CMTC in the contexts of care under fire and tactical field care. The study indicated that the trainees’ scores after training (75.67 ± 6.91) was higher than before training (69.17 ± 10.91), p < 0.001, the t-statistic was −5.022. The resultant SUS score was 70.4 ± 9.40. An overwhelming 96.67% of the trainees expressed satisfaction with the teaching quality.Conclusion:The CMTC system, developed in alignment with Tactical Combat Casualty Care (TCCC) guidelines and infused with cutting-edge equipment and technologies, provides an interactive and modular simulation training experience. Its strengths include higher reality, enhanced safety, repeatability, cost-effectiveness, and the provision for performance analysis. Besides, it has good accessibility and reliability, and can cultivate students’ autonomous learning ability and deepen their understanding.
{"title":"Development of virtual reality training system for combat musculoskeletal trauma care","authors":"Lincan Qin, Zhiwei You, Bo Liu, Chunmei Luo","doi":"10.1177/00375497241238025","DOIUrl":"https://doi.org/10.1177/00375497241238025","url":null,"abstract":"Objective:A virtual reality (VR)-based training system for combat musculoskeletal trauma care (CMTC) was meticulously crafted to enhance trainees’ theoretical understanding, familiarity with care processes, and decision-making abilities in the realm of combat musculoskeletal trauma management.Method:Scenario scripts, descriptions of injuries, and foundational management plans for care under fire and tactical field care were constructed. Subsequently, the CMTC system was developed employing tools, such as Maya, Photoshop, Unity, SQLite, and Visual Studio. Finally, the system was tested by 30 civilian nurses. The trainees’ knowledge, satisfaction, and system usability were evaluated using the theoretical question bank module, questionnaire, and system usability scale (SUS).Results:This research resulted in the establishment of five types of processes for CMTC in the contexts of care under fire and tactical field care. The study indicated that the trainees’ scores after training (75.67 ± 6.91) was higher than before training (69.17 ± 10.91), p < 0.001, the t-statistic was −5.022. The resultant SUS score was 70.4 ± 9.40. An overwhelming 96.67% of the trainees expressed satisfaction with the teaching quality.Conclusion:The CMTC system, developed in alignment with Tactical Combat Casualty Care (TCCC) guidelines and infused with cutting-edge equipment and technologies, provides an interactive and modular simulation training experience. Its strengths include higher reality, enhanced safety, repeatability, cost-effectiveness, and the provision for performance analysis. Besides, it has good accessibility and reliability, and can cultivate students’ autonomous learning ability and deepen their understanding.","PeriodicalId":501452,"journal":{"name":"SIMULATION","volume":"104 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140600850","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}
In this work, we attempt to bring together the origins, main results, and recent advances on discrete-event simulation of continuous-time systems. Starting from the early approaches that aimed to represent continuous-time dynamics within the discrete-event system specification (DEVS) formalism framework, the work shows how these ideas gave place to the formalization of the quantized state system (QSS) family of numerical integration algorithms. Then, we describe the QSS algorithms, their properties, their extensions, and the main practical software tools implementing them. We also present a selection of simulation examples illustrating the main features and advantages through comparisons with state-of-the-art continuous-time simulation solvers.
{"title":"Discrete-event simulation of continuous-time systems: evolution and state of the art of quantized state system methods","authors":"Rodrigo Castro, Mariana Bergonzi, Ezequiel Pecker Marcosig, Joaquín Fernández, Ernesto Kofman","doi":"10.1177/00375497241230985","DOIUrl":"https://doi.org/10.1177/00375497241230985","url":null,"abstract":"In this work, we attempt to bring together the origins, main results, and recent advances on discrete-event simulation of continuous-time systems. Starting from the early approaches that aimed to represent continuous-time dynamics within the discrete-event system specification (DEVS) formalism framework, the work shows how these ideas gave place to the formalization of the quantized state system (QSS) family of numerical integration algorithms. Then, we describe the QSS algorithms, their properties, their extensions, and the main practical software tools implementing them. We also present a selection of simulation examples illustrating the main features and advantages through comparisons with state-of-the-art continuous-time simulation solvers.","PeriodicalId":501452,"journal":{"name":"SIMULATION","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140313377","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}
In case of fire, effective evacuation guidance can reduce evacuees’ hesitation time and improve evacuation efficiency. In this paper, an improved model of fire evacuation (guided fire cellular automata, GF-CA) is provided. First, the parameters of the improved model are quantified and analyzed to determine the parameter calculation method and variation law. Second, a typical subway interchange station in Shenyang is used as an example for evacuation simulation. Then, a lightweight building information modeling (BIM) is constructed and applied to the example combining the evacuation simulation software of Pathfinder and virtual reality technology for personnel evacuation simulation. Three types of simulation scenarios are examined, including simulation without guiding factors, simulation with guiding factors based on the improved model, and simulation based on the virtual reality experiment with guiding factors. The results show that the evacuation efficiency is increased by 75.63% after effective guidelines through personnel diversion and reasonable exit allocation, noting that the path results of the model are highly similar to those of the virtual reality experiment, which has good validity and rationality. Meanwhile, we analyze the guiding scheme and propose that we should pay attention to the position of the sign and the configuration of the conductor, and flexibly use the composite scheme, which provides effective technical support for improving evacuation safety and evacuation efficiency.
{"title":"Modeling and simulation of fire evacuation considering guiding factors: a case study of Shenyang subway interchange station","authors":"Jiaxi Liu, Rui Zhang, Weidong Yan, Qingyan Zhao, Chunbing Guo","doi":"10.1177/00375497241236969","DOIUrl":"https://doi.org/10.1177/00375497241236969","url":null,"abstract":"In case of fire, effective evacuation guidance can reduce evacuees’ hesitation time and improve evacuation efficiency. In this paper, an improved model of fire evacuation (guided fire cellular automata, GF-CA) is provided. First, the parameters of the improved model are quantified and analyzed to determine the parameter calculation method and variation law. Second, a typical subway interchange station in Shenyang is used as an example for evacuation simulation. Then, a lightweight building information modeling (BIM) is constructed and applied to the example combining the evacuation simulation software of Pathfinder and virtual reality technology for personnel evacuation simulation. Three types of simulation scenarios are examined, including simulation without guiding factors, simulation with guiding factors based on the improved model, and simulation based on the virtual reality experiment with guiding factors. The results show that the evacuation efficiency is increased by 75.63% after effective guidelines through personnel diversion and reasonable exit allocation, noting that the path results of the model are highly similar to those of the virtual reality experiment, which has good validity and rationality. Meanwhile, we analyze the guiding scheme and propose that we should pay attention to the position of the sign and the configuration of the conductor, and flexibly use the composite scheme, which provides effective technical support for improving evacuation safety and evacuation efficiency.","PeriodicalId":501452,"journal":{"name":"SIMULATION","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140299663","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}
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