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A generalised SEIRD model with implicit social distancing mechanism: A Bayesian approach for the identification of the spread of COVID-19 with applications in Brazil and Rio de Janeiro state 具有隐式社交距离机制的广义SEIRD模型:识别新冠肺炎传播的贝叶斯方法及其在巴西和里约热内卢州的应用
IF 2.5 4区 工程技术 Q4 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2021-09-29 DOI: 10.1080/17477778.2021.1977731
D. Volpatto, A. C. M. Resende, Lucas dos Anjos, João V. O. Silva, C. M. Dias, R. C. Almeida, S. Malta
ABSTRACT We develop a generalized Susceptible--Exposed--Infected--Removed--Dead (SEIRD) model considering social distancing measures to describe the COVID-19 spread in Brazil. We assume uncertain scenarios with limited testing capacity, lack of reliable data, under-reporting of cases, and restricted testing policy. A Bayesian framework is proposed for the identification of model parameters and uncertainty quantification of the model outcomes. We identify through sensitivity analysis (SA) that the model parameter related to social distancing measures is one of the most influential. Different relaxation strategies of social distancing measures are then investigated to determine which are viable and less hazardous to the population. The scenario of abrupt social distancing relaxation implemented after the peak of positively diagnosed cases can prolong the epidemic. A more severe scenario occurs if a social distancing relaxation policy is implemented prior to the evidence of epidemiological control, indicating the importance of the appropriate choice of when to start the relaxation.
我们建立了一个广义的易感-暴露-感染-移除-死亡(SEIRD)模型,考虑社会距离措施来描述COVID-19在巴西的传播。我们假设不确定的情况下,检测能力有限,缺乏可靠的数据,病例报告不足,检测政策受限。提出了一个贝叶斯框架,用于模型参数的识别和模型结果的不确定性量化。通过敏感性分析(SA),我们发现与社会距离措施相关的模型参数是最具影响力的参数之一。然后研究了不同的放松社会距离措施的策略,以确定哪些是可行的,对人群的危害较小。在确诊病例高峰后突然放松社交距离的情景可能会延长疫情。如果在流行病学控制证据出现之前实施放松社会距离政策,则会出现更严重的情况,这表明适当选择何时开始放松政策的重要性。
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引用次数: 4
Social identity theory applied to the game of self-regulation of social exchanges based on multiagent systems 基于多智能体系统的社会交换自我调节博弈研究
IF 2.5 4区 工程技术 Q4 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2021-09-22 DOI: 10.1080/17477778.2021.1977730
Jader Saldanha, D. Adamatti, G. Dimuro
ABSTRACT Autonomous intelligent agents participate in complex social situations. It is necessary that agents are aware of their society and still understand their context of action and interaction. Such social situation with other agents is influenced by society’s characteristics, including their norms, values, common interests and objectives, members, and social structures. Each complex society is broken down into social groups, each one with an identity. Social identity theory is seen as an analysis of intergroup relations in social categories based on the cognitive definition and the autoconcept of a social group and their belonging. Researchers have been studying this theory in computing, more specifically in multiagent systems. Social exchanges are the object of study in diverse contexts in which social relations are understood as social exchanges. One of the investigated themes is the self-regulation of social exchanges. The game of self-regulation of social exchanges explores its self-regulation but it does not analyse the agents’ identity. Therefore, this research investigates the integration of psychosocial analysis of social identity theory into the social adaptive complex society of the game of self-regulation of social exchanges. The principal result of this work is the GSRSEPSIT, a social simulation model.
自主智能体参与复杂的社会情境。这是必要的,代理人意识到他们的社会,仍然理解他们的行动和互动的背景。这种与其他主体的社会状况受到社会特征的影响,包括社会规范、价值观、共同利益和目标、成员和社会结构。每个复杂的社会都被分解成社会群体,每个群体都有自己的身份。社会认同理论是一种基于认知定义和社会群体及其归属的自我概念的社会范畴的群体间关系分析。研究人员一直在研究计算中的这一理论,特别是在多智能体系统中。社会交换是在社会关系被理解为社会交换的不同背景下的研究对象。研究的主题之一是社会交换的自我调节。社会交换的自我调节博弈探讨了社会交换的自我调节,但没有分析社会交换主体的身份。因此,本研究将社会认同理论的社会心理分析整合到社会适应性复杂社会的博弈自我调节社会交换中。这项工作的主要成果是GSRSEPSIT,一个社会模拟模型。
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引用次数: 0
Assessing the consequences of second-generation bioenergy crops for grain/livestock farming on the Canadian prairies: An agent-based simulation 评估第二代生物能源作物对加拿大大草原谷物/牲畜养殖的影响:基于代理的模拟
IF 2.5 4区 工程技术 Q4 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2021-09-04 DOI: 10.1080/17477778.2021.1970487
Leigh Anderson, R. Schoney, J. Nolan
ABSTRACT In North America, alternative energy policies have been mostly focused on first-generation biofuels. There is continued development of second-generation biofuels (SGB), crops founded upon low-value feedstocks thriving on marginal (low quality) land. SGB’s alter the farming decision environment since they do not compete directly with high-value annual crops. To examine possible future consequences of SGB’s on mixed farming, we develop anagent-based simulation model (ABM) of a major agricultural region in Western Canada. If energy prices for SGB’s rise high enough, there will likely be structural changes in the sector. Farmers with significant quantities of marginal land experience the greatest benefit adopting energy crops. Spillover effects of energy crop adoption will also be felt in the beef industry since cattle numbers will be gradually reduced. Simulation results also indicate that beef farmers are better off with SGB crops since energy crops stabilise farm income as average farm size decreases.
在北美,替代能源政策主要侧重于第一代生物燃料。第二代生物燃料(SGB)的持续发展,以低价值原料为基础的作物在边际(低质量)土地上茁壮成长。SGB改变了农业决策环境,因为它们不直接与高价值的一年生作物竞争。为了研究SGB对混合农业未来可能产生的影响,我们开发了加拿大西部一个主要农业区的基于agent的模拟模型(ABM)。如果SGB所需的能源价格上涨到足够高的水平,该行业可能会出现结构性变化。拥有大量边际土地的农民采用能源作物获益最大。采用能源作物的溢出效应也将在牛肉行业感受到,因为牛的数量将逐渐减少。模拟结果还表明,养牛户使用SGB作物会更好,因为随着平均农场规模的减少,能源作物稳定了农场收入。
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引用次数: 5
An agent-based model to assess citizens’ acceptance of COVID-19 restrictions 评估公民对新冠肺炎限制措施接受程度的基于代理的模型
IF 2.5 4区 工程技术 Q4 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2021-08-23 DOI: 10.1080/17477778.2021.1965501
R. Falcone, A. Sapienza
ABSTRACT Italy was the first European state affected by COVID-19. Despite many uncertainties, citizens chose to trust the authorities and their trust was pivotal. This research aims to investigate the contribution of Italian citizens’ trust in Public Institutions and how it influenced the acceptance of the necessary counter measures. Applying linear regression to a dataset of 4260 Italian respondents, we modelled trust from its main cognitive components, with particular reference to competence and willingness. Therefore, exploiting agent-based modelling, we investigated how these components affected trust and how trust evolution influences the acceptance of these restrictive measures. Our analysis confirms the key role of competence and willingness as cognitive components of trust. Results also suggest that a generic attempt to raise the average trust, besides being challenging, may not be the best strategy to increase compliance. Furthermore, reasoning at category level is a fundamental to identify the best components on which to invest.
摘要意大利是第一个受新冠肺炎影响的欧洲国家。尽管存在许多不确定性,公民还是选择信任当局,他们的信任至关重要。本研究旨在调查意大利公民对公共机构的信任的贡献,以及它如何影响对必要反措施的接受。将线性回归应用于4260名意大利受访者的数据集,我们从信任的主要认知成分,特别是能力和意愿,对信任进行了建模。因此,利用基于代理的建模,我们研究了这些组成部分如何影响信任,以及信任进化如何影响对这些限制措施的接受。我们的分析证实了能力和意愿作为信任的认知组成部分的关键作用。研究结果还表明,提高平均信任度的一般尝试除了具有挑战性外,可能不是提高合规性的最佳策略。此外,类别层面的推理是确定投资的最佳组成部分的基础。
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引用次数: 4
Mobile experimentation using modelling and simulation in the Fog/Cloud 在雾/云中使用建模和模拟的移动实验
IF 2.5 4区 工程技术 Q4 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2021-08-20 DOI: 10.1080/17477778.2021.1964393
Khaldoon Al-Zoubi, Gabriel A. Wainer
ABSTRACT Recently, we have seen an increase of the use of Cloud computing to provide Modelling & Simulation services. In general, mobility support is lacking since clients normally contact the same centralised clouds regardless of their locations. In this research, we propose a method and algorithms to build Fogs as private services in which different middleware running in varied Virtual Machines (on various distributed Fogs and Cloud backbone) to expose different services. Clients access services via nearby Fogs, which then discover the required resources to run experiments (on Fogs or cloud backbone). Our focus is on mobility, to permit clients to conduct experiments (and visualise simulation results) using mobile devices. Mobility support is further improved by introducing the novel concept of a mobile simulation experiment: if a device moves away from a given Fog zone, the experiment moves with the device. We present a prototype implementation, evaluation results, and different case studies.
最近,我们看到越来越多的人使用云计算来提供建模和仿真服务。一般来说,缺乏移动性支持,因为客户通常与相同的集中式云联系,而不管其位置如何。在本研究中,我们提出了一种方法和算法来将Fogs构建为私有服务,其中不同的中间件运行在不同的虚拟机上(在各种分布式Fogs和云主干上)以暴露不同的服务。客户端通过附近的Fogs访问服务,然后发现运行实验所需的资源(在Fogs或云主干上)。我们的重点是移动性,允许客户使用移动设备进行实验(并可视化模拟结果)。通过引入移动模拟实验的新概念,进一步改进了移动支持:如果设备离开给定的雾区,实验将随着设备移动。我们提出了一个原型实现、评估结果和不同的案例研究。
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引用次数: 4
A hybrid data gathering and agent based cognitive architecture for realistic crowd simulations 一种用于真实人群模拟的混合数据收集和基于agent的认知架构
IF 2.5 4区 工程技术 Q4 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2021-07-27 DOI: 10.1080/17477778.2021.1954487
Jacob Sinclair, Hemmaphan Suwanwiwat, Ickjai Lee
ABSTRACT This paper proposes a realistic agent-based framework for crowd simulations that can encompass the input phase, the simulation process phase, and the output evaluation phase. In order to achieve this gathering, the three types of real-world data (physical, mental and visual) need to be considered. However, existing research has not used all the three data types to develop an agent-based framework since current data gathering methods are unable to collect all the three types. This paper introduces anew hybrid data gathering approach using a combination of virtual reality and questionnaires to gather all three data types. The data collected are incorporated into the simulation model to provide realism and flexibility. The performance of the framework is evaluated and benchmarked to prove the robustness and effectiveness of our framework. Various types of settings (self-set parameters and random parameters) are simulated to demonstrate that the framework can produce real-world like simulation.
摘要本文提出了一个现实的基于agent的人群模拟框架,该框架可以包括输入阶段、模拟过程阶段和输出评估阶段。为了实现这种收集,需要考虑三种类型的真实世界数据(物理、心理和视觉)。然而,现有的研究并没有使用这三种数据类型来开发基于代理的框架,因为目前的数据收集方法无法收集这三种类型。本文介绍了一种新的混合数据收集方法,将虚拟现实和问卷相结合,收集所有三种数据类型。所收集的数据被合并到模拟模型中,以提供真实性和灵活性。对框架的性能进行了评估和基准测试,以证明我们的框架的稳健性和有效性。模拟了各种类型的设置(自设置参数和随机参数),以证明该框架可以产生类似真实世界的模拟。
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引用次数: 0
SpaceFOM - A robust standard for enabling a-priori interoperability of HLA-based space systems simulations SpaceFOM——一个强大的标准,用于实现基于hla的空间系统模拟的先验互操作性
IF 2.5 4区 工程技术 Q4 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2021-07-03 DOI: 10.1080/17477778.2021.1945962
E. Crues, Dan Dexter, A. Falcone, A. Garro, B. Möller
ABSTRACT The development of modern space systems requires the collaboration among several national and international space organisations. Along with this complexity and diversity come progressively increasing challenges with managing the associated requirements, properties, emergent behaviours, and integration risks. Collaborative and distributed simulation is one technology being applied to address these challenges. A notable example of this is the well-established standard for distributed simulation, the IEEE 1516-2010 – High Level Architecture (HLA). To enable and ensure a-priori interoperability for complex space systems simulations and foster international collaboration, the Simulation Interoperability Standards Organization (SISO) formed a Product Development Group (PDG) to develop the Space Reference Federation Object Model (SpaceFOM). This article presents the SpaceFOM standard describing the principal design elements that compose it along with a set of design patterns introduced to deal with common issues in distributed simulation and to pursue extensibility, interoperability, and robustness.
摘要现代空间系统的发展需要几个国家和国际空间组织的合作。伴随着这种复杂性和多样性,在管理相关需求、特性、紧急行为和集成风险方面也面临着越来越大的挑战。协作和分布式仿真是一种正在应用的技术来应对这些挑战。这方面的一个显著例子是公认的分布式仿真标准,IEEE 1516-2010——高层体系结构(HLA)。为了实现和确保复杂空间系统模拟的先验互操作性,并促进国际合作,模拟互操作性标准组织成立了一个产品开发小组,以开发空间参考联合会对象模型。本文介绍了SpaceFOM标准,描述了构成该标准的主要设计元素,并介绍了一组设计模式,以处理分布式仿真中的常见问题,并追求可扩展性、互操作性和健壮性。
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引用次数: 7
A system dynamics model application to operating room planning and management 系统动力学模型在手术室规划与管理中的应用
IF 2.5 4区 工程技术 Q4 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2021-06-08 DOI: 10.1080/17477778.2021.1932622
S. Faeghi, K. Lennerts, S. Nickel
ABSTRACT Operating room (OR) management has remarkable impacts on the efficiency of not only OR departments themselves but also other functions of hospitals. Therefore, evaluation of long-term adequacy of specific decisions regarding the OR planning is of a notable importance. Since hospitals deal with a varying environment, every long-term analysis must investigate the hospital responsiveness to the relevant changes. For this purpose, the system dynamics (SD) approach can be very useful. Generally, SD models are not dependent on high-quality and can be applied to problems at strategic levels. Using a SD approach, this paper aims to consider OR departments as multi-product systems and study their dynamism. The proposed model is based on a mesoscopic approach, which represents the flow processes through piecewise constant rates. The proposed model is generic, modular and easy to extend and described by means of MATLAB/Simulink®. A real case study is considered to validate and demonstrate its usefulness.
手术室管理不仅对手术室本身的效率有显著影响,而且对医院其他职能的效率也有显著影响。因此,评估关于OR规划的具体决策的长期充分性具有显著的重要性。由于医院应对的环境各不相同,每次长期分析都必须调查医院对相关变化的反应。为此,系统动力学(SD)方法可能非常有用。一般来说,SD模型不依赖于高质量,可以应用于战略层面的问题。本文采用SD方法,将OR部门视为多产品系统,并研究其动态性。所提出的模型基于介观方法,该方法表示通过分段恒定速率的流动过程。所提出的模型是通用的、模块化的,易于通过MATLAB/Simulink®进行扩展和描述。一个真实的案例研究被认为是验证和证明其有用性。
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引用次数: 6
A persuasive multi-agent simulator to improve electrical energy consumption 一个有说服力的多智能体模拟器,以提高电能消耗
IF 2.5 4区 工程技术 Q4 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2021-05-31 DOI: 10.1080/17477778.2021.1931499
F. Mota, C. Steffens, D. Adamatti, S. Botelho, V. Rosa
ABSTRACT Gathering information on electric energy consumption is important for companies and institutions aiding in making plans. Multi-agent systems can aid such companies in understanding the different behaviours presented within the context of a society constituted by autonomous entities. We propose a multi-agent simulator capable of emulating different profiles of consumers and equipment. Our approach differs from others in three fundamental aspects: i). it models parameters that are difficult to predict, which are calibrated using values provided by available records; ii). it can be applied to different simulation environments involving various degrees of scalability and heterogeneity of profiles both of individual behaviour and household appliances; iii). it simulates the complexity of the system, providing estimates through the simulation of the interaction between users and electrical appliances. The results obtained by the model were similar to the numbers provided by the literature, which suggests the validity of the proposed approach.
摘要收集电能消耗信息对于协助制定计划的公司和机构来说非常重要。多代理系统可以帮助这些公司理解在由自治实体组成的社会背景下呈现的不同行为。我们提出了一种能够模拟消费者和设备的不同配置文件的多智能体模拟器。我们的方法与其他方法在三个基本方面不同:一)。它对难以预测的参数进行建模,这些参数使用可用记录提供的值进行校准;ii)。它可以应用于不同的模拟环境,包括个人行为和家用电器的不同程度的可扩展性和异质性;iii)。它模拟了系统的复杂性,通过模拟用户和电器之间的交互来提供估计。该模型获得的结果与文献中提供的数字相似,这表明了所提出方法的有效性。
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引用次数: 3
A hybrid simulation approach applied in sustainability performance assessment in make-to-order supply chains: The case of a commercial aircraft manufacturer 一种混合仿真方法在按订单制造供应链可持续性绩效评估中的应用:以某商用飞机制造商为例
IF 2.5 4区 工程技术 Q4 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2021-05-31 DOI: 10.1080/17477778.2021.1931500
Catia Barbosa, Carlos Malarranha, A. Azevedo, Ana Carvalho, A. Barbosa‐Póvoa
ABSTRACT Make-to-order (MTO) supply chains (SC), common in aerospace industries, are very complex compared to mass production chains. Moreover, one of the significant long-term challenges is sustainability performance across its entire supply chain. However, this is not an easy task given the complexity involved, so decision support tools are fundamental instruments in understanding the entire supply chain from a sustainability performance perspective. Using simulation as a research method, this article proposes a hybrid and hierarchical performance assessment model, considering key sustainability indicators. The model is hybrid due to the use of different simulation methods– System Dynamics (SD), Discrete Event Simulation (DES), and Agent-based simulation (ABS). The model is applied to an aerospace manufacturer’s real case to assess the sustainability performance of alternative SC. Unlike existing contributions, this work addresses the make-to-order supply chain from a sustainability performance perspective and does not compromise the representation of the diverse manufacturing functions and resources.
摘要:与大规模生产链相比,航空航天工业中常见的按订单制造(MTO)供应链非常复杂。此外,重要的长期挑战之一是其整个供应链的可持续性表现。然而,考虑到所涉及的复杂性,这不是一项容易的任务,因此决策支持工具是从可持续性绩效角度理解整个供应链的基本工具。本文以模拟为研究方法,提出了一种考虑关键可持续性指标的混合层次绩效评估模型。该模型是混合的,因为使用了不同的模拟方法——系统动力学(SD)、离散事件模拟(DES)和基于代理的模拟(ABS)。该模型应用于航空航天制造商的真实案例,以评估替代SC的可持续性性能。与现有贡献不同,这项工作从可持续性性能的角度解决了按订单生产的供应链,并且不影响不同制造功能和资源的代表性。
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引用次数: 3
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Journal of Simulation
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