Comput. Pub Date : 2023-07-05 DOI: 10.3390/computation11070132

Aleksandr Alekseev, Z. Mingaleva, I. Alekseeva, E. Lobova, Alexander Oksman, Alexander Mitrofanov

{"title":"Developing a Numerical Method of Risk Management Taking into Account the Decision-Maker's Subjective Attitude Towards Multifactorial Risks","authors":"Aleksandr Alekseev, Z. Mingaleva, I. Alekseeva, E. Lobova, Alexander Oksman, Alexander Mitrofanov","doi":"10.3390/computation11070132","DOIUrl":"https://doi.org/10.3390/computation11070132","url":null,"abstract":"Risk involves identifying several options that the decision-maker can opt for while making a choice either in the direction of risk or reliability. In this approach, risk is defined as the action of the subject which will lead to the loss or guaranteed safety of what has been achieved. As the uncertainty of the external business environment increases for companies, the task of managing risks both individually and as a set of risks becomes more and more relevant. The purpose of this study is to solve the problem of managing multifactorial risks using mathematical methods for determining the optimal risk management trajectories separately for each factor. To determine the optimal risk management trajectories for each factor, a numerical method is used based on the choice of the most effective direction, which is defined as the ratio of risk change to cost change. An information system prototype has been created that can support the management of a set of risks. Approbation of the information system was carried out on an example containing two conceptual risk factors. The proposed prototype builds a three-dimensional risk map by interpolating the risk matrix entered by the risk manager using an additive–multiplicative aggregation procedure, as well as optimal risk management trajectories for all entered risk factors.","PeriodicalId":10526,"journal":{"name":"Comput.","volume":"7 1","pages":"132"},"PeriodicalIF":0.0,"publicationDate":"2023-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83520700","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

Analytical Solution and Numerical Simulation of Heat Transfer in Cylindrical- and Spherical-Shaped Bodies 圆柱形和球形物体传热的解析解和数值模拟

Comput. Pub Date : 2023-07-05 DOI: 10.3390/computation11070131

H. Jalghaf, Endre Kovács, I. F. Barna, László Mátyás

引用次数: 0

Special Issue "Advances in Machine and Deep Learning in the Health Domain" 特刊“健康领域机器和深度学习的进展”

Comput. Pub Date : 2023-07-04 DOI: 10.3390/computers12070135

A. Celesti, I. D. Falco, A. Galletta, Giovanna Sannino

引用次数: 0

Applications of Modified Bessel Polynomials to Solve a Nonlinear Chaotic Fractional-Order System in the Financial Market: Domain-Splitting Collocation Techniques 修正贝塞尔多项式在求解金融市场非线性混沌分数阶系统中的应用:域分裂配置技术

Comput. Pub Date : 2023-07-03 DOI: 10.3390/computation11070130

M. Izadi, H. M. Srivastava

{"title":"Applications of Modified Bessel Polynomials to Solve a Nonlinear Chaotic Fractional-Order System in the Financial Market: Domain-Splitting Collocation Techniques","authors":"M. Izadi, H. M. Srivastava","doi":"10.3390/computation11070130","DOIUrl":"https://doi.org/10.3390/computation11070130","url":null,"abstract":"We propose two accurate and efficient spectral collocation techniques based on a (novel) domain-splitting strategy to handle a nonlinear fractional system consisting of three ODEs arising in financial modeling and with chaotic behavior. One of the major numerical difficulties in designing traditional spectral methods is in the handling of model problems on a long computational domain, which usually yields to loss of accuracy. One remedy is to split the underlying domain and apply the spectral method locally in each subdomain rather than on the global domain of interest. To treat the chaotic financial system numerically, we use the generalized version of modified Bessel polynomials (GMBPs) in the collocation matrix approaches along with the domain-splitting strategy. Whereas the first matrix collocation scheme is directly applied to the financial model problem, the second one is a combination of the quasilinearization method and the direct first numerical matrix method. In the former approach, we arrive at nonlinear algebraic matrix equations while the resulting systems are linear in the latter method and can be solved more efficiently. A convergence theorem related to GMBPs is proved and an upper bound for the error is derived. Several simulation outcomes are provided to show the utility and applicability of the presented matrix collocation procedures.","PeriodicalId":10526,"journal":{"name":"Comput.","volume":"67 1","pages":"130"},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84051483","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

Computation of the Exact Forms of Waves for a Set of Differential Equations Associated with the SEIR Model of Epidemics 与SEIR流行病模型相关的一组微分方程波的精确形式的计算

Comput. Pub Date : 2023-07-02 DOI: 10.3390/computation11070129

N. Vitanov, Z. Dimitrova

{"title":"Computation of the Exact Forms of Waves for a Set of Differential Equations Associated with the SEIR Model of Epidemics","authors":"N. Vitanov, Z. Dimitrova","doi":"10.3390/computation11070129","DOIUrl":"https://doi.org/10.3390/computation11070129","url":null,"abstract":"We studied obtaining exact solutions to a set of equations related to the SEIR (Susceptible-Exposed-Infectious-Recovered) model of epidemic spread. These solutions may be used to model epidemic waves. We transformed the SEIR model into a differential equation that contained an exponential nonlinearity. This equation was then approximated by a set of differential equations which contained polynomial nonlinearities. We solved several equations from the set using the Simple Equations Method (SEsM). In doing so, we obtained many new exact solutions to the corresponding equations. Several of these solutions can describe the evolution of epidemic waves that affect a small percentage of individuals in the population. Such waves have frequently been observed in the COVID-19 pandemic in recent years. The discussion shows that SEsM is an effective methodology for computing exact solutions to nonlinear differential equations. The exact solutions obtained can help us to understand the evolution of various processes in the modeled systems. In the specific case of the SEIR model, some of the exact solutions can help us to better understand the evolution of the quantities connected to the epidemic waves.","PeriodicalId":10526,"journal":{"name":"Comput.","volume":"64 1","pages":"129"},"PeriodicalIF":0.0,"publicationDate":"2023-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76616654","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

Technologies Supporting Screening Oculomotor Problems: Challenges for Virtual Reality 支持筛选眼动问题的技术:对虚拟现实的挑战

Comput. Pub Date : 2023-07-01 DOI: 10.3390/computers12070134

Are Dæhlen, I. Heldal, Qasim Ali

引用次数: 0

Response Spectrum Analysis of Multi-Story Shear Buildings Using Machine Learning Techniques 基于机器学习技术的多层剪力结构反应谱分析

Comput. Pub Date : 2023-06-29 DOI: 10.3390/computation11070126

Manolis Georgioudakis, V. Plevris

引用次数: 3

Stefan Blowing Impacts on Hybrid Nanofluid Flow over a Moving Thin Needle with Thermal Radiation and MHD 基于热辐射和MHD的Stefan吹气对移动细针上混合纳米流体流动的影响

Comput. Pub Date : 2023-06-29 DOI: 10.3390/computation11070128

V. S. Reddy, Jagan Kandasamy, S. Sivanandam

引用次数: 1

Mixed Cultural Visits or What COVID-19 Taught Us 混合文化访问或COVID-19教给我们什么

Comput. Pub Date : 2023-06-29 DOI: 10.20944/preprints202305.0919.v1

Angeliki Antoniou

{"title":"Mixed Cultural Visits or What COVID-19 Taught Us","authors":"Angeliki Antoniou","doi":"10.20944/preprints202305.0919.v1","DOIUrl":"https://doi.org/10.20944/preprints202305.0919.v1","url":null,"abstract":"When the majority of museums and other cultural institutions were shut down due to the pandemic, mixed museum visits became a hot issue. After the pandemic, mixed visits, in the opinion of many experts, would become the new norm for experiencing cultural content. Diverse types of mergers between online and onsite visits have already begun to be investigated by researchers, with the purpose of not only avoiding the spread of disease but also of enabling visits of people who were previously excluded, such as persons in remote geographic areas or people with mobility challenges. In fact, over the last three years, there have been rapid developments in mixed visits in cultural heritage sites. The current work takes into account a contextual model of museum learning to define potential use scenarios for visits from people of different cultural backgrounds and offers an evaluation of current practices. The new model that emerges, the contextual model of mixed visits, allows for the further study of the field, as it attempts to describe recent research efforts in four main contexts: mixed visits in the personal context, mixed visits in the socio-cultural context, mixed visits in the physical context, and temporality of mixed visits. Inductive analysis of a literature review allowed the extraction of relevant themes, examples from museums, as well as extraction of guidelines.","PeriodicalId":10526,"journal":{"name":"Comput.","volume":"61 1","pages":"133"},"PeriodicalIF":0.0,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73821331","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

Analytical and Numerical Results for the Diffusion-Reaction Equation When the Reaction Coefficient Depends on Simultaneously the Space and Time Coordinates 反应系数同时依赖于时空坐标时扩散-反应方程的解析和数值结果

Comput. Pub Date : 2023-06-29 DOI: 10.3390/computation11070127

A. Askar, A. Nagy, I. F. Barna, Endre Kovács

引用次数: 2

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