Journal of Defense Modeling and Simulation-Applications Methodology Technology-JDMS最新文献_第10页

Parameter characterization of a buried mine blast event with further emphasis on sympathetic detonation and layered soil bed conditions 埋地矿井爆炸事件参数表征，进一步强调交感爆轰和层状土床条件

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Journal of Defense Modeling and Simulation-Applications Methodology Technology-JDMS Pub Date : 2021-06-10 DOI: 10.1177/15485129211021169

Morten Rikard Jensen, Wilford Smith, Kshitiz Khanna

{"title":"Parameter characterization of a buried mine blast event with further emphasis on sympathetic detonation and layered soil bed conditions","authors":"Morten Rikard Jensen, Wilford Smith, Kshitiz Khanna","doi":"10.1177/15485129211021169","DOIUrl":"https://doi.org/10.1177/15485129211021169","url":null,"abstract":"The presented work documents the results of a comprehensive sensitivity study of the structural response of a military vehicle subjected to the impulse from a buried charge using the discrete particle method (DPM) to model the soil and high explosive (HE) coupled to a finite-element solver for the structure. Eighteen different process and numerical parameters were studied. Each of the numerical results was compared with a base model to see the influence of the considered parameter. The structure in the base model was the TARDEC Generic Vehicle Hull and the response parameter was chosen to be the total blast impulse (TBI) on the structure. The non-linear transient dynamic explicit finite-element solver used for the analysis was the IMPETUS Afea Solver®. The study includes soil characteristics and charge related parameters, such as size, type, geometry, and location. The depth of burial (DOB) and number of discrete particles were also considered in the study. Further, different numerical parameters were included. The results provide a good understanding of process and numerical parameters when modeling buried charges with a coupled finite-element model (FEM) and DPM approach. As a natural extension of the sensitivity study the effect of a layered soil bed is investigated, the topsoil either being dry or wet soil. Further, it is illustrated how to model a sympathetic detonation where the detonation of one improvised explosive device (IED) generates a pressure that results in the detonation of a second IED.","PeriodicalId":44661,"journal":{"name":"Journal of Defense Modeling and Simulation-Applications Methodology Technology-JDMS","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84064365","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

Designing hierarchical networks to improve patient access to care: a case study in veteran eye care 设计分层网络以改善患者获得护理的机会:退伍军人眼科护理的案例研究

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Journal of Defense Modeling and Simulation-Applications Methodology Technology-JDMS Pub Date : 2021-06-09 DOI: 10.1177/15485129211021167

Adam VanDeusen, Amy E. M. Cohn, April Y. Maa

{"title":"Designing hierarchical networks to improve patient access to care: a case study in veteran eye care","authors":"Adam VanDeusen, Amy E. M. Cohn, April Y. Maa","doi":"10.1177/15485129211021167","DOIUrl":"https://doi.org/10.1177/15485129211021167","url":null,"abstract":"Across the United States, many patients, including veteran patients, face barriers in accessing appropriate, timely, and affordable healthcare. When developing or modifying healthcare systems to improve patient access, we can consider strategies (e.g., telehealth) in which lower-cost, more abundant resources are used for services often performed with more constrained and/or more expensive, specialized resources. We propose a framework in which hierarchical care networks allow patients to receive frontline care from lower cost, more accessible alternatives, while specialized resources are reserved for more complex care. We use operations research tools, including mixed-integer programming and facility location models, to design and analyze these networks. We present a case study applying these methods to improve veterans’ access to eye care screenings. The case study results demonstrate that using different providers in locations throughout the system can increase the number of patients screened by nearly four times the number currently screened while increasing the budget by only 2.5%. When designing healthcare networks to improve access, decision makers must consider several trade-offs, including how resources are distributed. Operations research tools are effective methods for understanding, designing, and evaluating these trade-offs to best understand the wide-ranging impacts of resource (re)distribution.","PeriodicalId":44661,"journal":{"name":"Journal of Defense Modeling and Simulation-Applications Methodology Technology-JDMS","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79091674","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

Radiological urban threat due to special protective actions from security forces 由于安全部队采取的特殊保护行动，城市受到放射性威胁

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Journal of Defense Modeling and Simulation-Applications Methodology Technology-JDMS Pub Date : 2021-05-24 DOI: 10.1177/15485129211016539

Mariana S. C. Castro, A. L. Q. Reis, R. Stenders, I. S. Alves, J. Amorim, A. Silva, E. Andrade

{"title":"Radiological urban threat due to special protective actions from security forces","authors":"Mariana S. C. Castro, A. L. Q. Reis, R. Stenders, I. S. Alves, J. Amorim, A. Silva, E. Andrade","doi":"10.1177/15485129211016539","DOIUrl":"https://doi.org/10.1177/15485129211016539","url":null,"abstract":"The neutralization of suspicious objects by a conventional explosion in public places seems to be an option often considered by security forces. A radiological dispersive device (RDD) uses a radioactive material coupled to an amount of conventional explosive in order to contaminate an area. Extremist groups may take advantage of such protocol by leaving the radioactive material in public places to provoke suspicion, thus leading to the neutralization by an explosion, which in turn creates a RDD event. This work aims to discuss the influence of such a protocol in the radiological threat by means of computational simulation. The total maximum effective dose equivalent (TEDE Max), the Pasquill–Gifford atmospheric stability classes (PG classes), and the potentially affected population size were evaluated. The results consider two radionuclides Cs-137 and Sr-90. The findings allow us to infer that TEDE Max and surface contamination are strongly dependent on the PG classes. In addition, the affected population size depends on the plume size, which seems to be independent of the radionuclide, but not of the PG classes. Therefore, PG classes play a key role in the radiological threat. The findings may be of value to support decisions when facing an event.","PeriodicalId":44661,"journal":{"name":"Journal of Defense Modeling and Simulation-Applications Methodology Technology-JDMS","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90352058","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

Tracking and modeling public perceptions toward the reality of COVID-19 pandemic in Nigeria 跟踪和模拟公众对尼日利亚COVID-19大流行现实的看法

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Journal of Defense Modeling and Simulation-Applications Methodology Technology-JDMS Pub Date : 2021-05-13 DOI: 10.1177/15485129211016543

Abdullahi Yusuf, Nasiru Ibrahim Tambuwal, Hadiza Ahmad Gusau, Faruk Usman Maiyaki

{"title":"Tracking and modeling public perceptions toward the reality of COVID-19 pandemic in Nigeria","authors":"Abdullahi Yusuf, Nasiru Ibrahim Tambuwal, Hadiza Ahmad Gusau, Faruk Usman Maiyaki","doi":"10.1177/15485129211016543","DOIUrl":"https://doi.org/10.1177/15485129211016543","url":null,"abstract":"The study tracked and modeled public perceptions toward the reality of COVID-19 pandemic in Nigeria over a 3 month period (10 May to 10 August 2020); 2580 Nigerians across the six geopolitical zones were selected to participate in the study. These participants were selected from various social media platforms and were requested to complete an online survey over a 3-month period. Data were analyzed in three phases: tracking, modeling, and forecasting. We first tracked the respondents’ perceptions in the form of a qualitative response, where seven thematic constructs emerged from content analysis. These constructs were confirmed in the modeling phase, using structural equation modeling after data transformation. The themes were forecast as a single construct to predict possible trends and patterns over the next 3 month period using an autoregressive integrated moving average. Our findings revealed that public perceptions toward the reality of COVID-19 pandemic in Nigeria fall into seven thematic constructs: “scam,” “fake,” “politics,” “business venture,” “exaggeration,” “real,” and “real but manipulated.” These constructs show a steady trend with a random walk pattern, suggesting that perceptions toward the reality of COVID-19 in Nigeria will remain relatively unchanged over the next 3 month period. We recommend, among other things, that massive and intensive sensitization and awareness programs are needed to change the public mindset concerning the reality of the pandemic in Nigeria.","PeriodicalId":44661,"journal":{"name":"Journal of Defense Modeling and Simulation-Applications Methodology Technology-JDMS","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81007541","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

Military scientism and its discontents 军事科学主义及其不满

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Journal of Defense Modeling and Simulation-Applications Methodology Technology-JDMS Pub Date : 2021-05-12 DOI: 10.1177/15485129211014281

R. Wallace

引用次数: 2

Estimating the tactical impact of robot swarms using a semi-automated forces system and design of experiments methods 利用半自动化部队系统估计机器人群的战术影响并设计实验方法

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Journal of Defense Modeling and Simulation-Applications Methodology Technology-JDMS Pub Date : 2021-05-09 DOI: 10.1177/15485129211008532

Kevin L Foster, Mikel D. Petty

{"title":"Estimating the tactical impact of robot swarms using a semi-automated forces system and design of experiments methods","authors":"Kevin L Foster, Mikel D. Petty","doi":"10.1177/15485129211008532","DOIUrl":"https://doi.org/10.1177/15485129211008532","url":null,"abstract":"Militaries are developing autonomous robots to conduct missions such as reconnaissance and surveillance. Some of those robots are intended to operate in swarms. Because operational robot swarms are not yet available, doctrine developers will initially use constructive entity-level combat models to develop and test tactics for robot swarms. Design of experiments methods and retrodiction of the 1991 Battle of 73 Easting between US and Iraqi forces were used to calibrate a semi-automated forces system. The calibrated combat model was then used to estimate the tactical impact of a notional Iraqi robot swarm conducting reconnaissance and surveillance in that battle. The calibration ensured that the model’s parameters were accurate, enabling a reliable estimate of the swarm’s tactical impact. Additionally, the design of experiments methods produced estimates of the interaction of the robot swarm’s effect with the technologies of the combatants’ weapon systems. Simulation trials and statistical analysis showed that the tactical benefits of an Iraqi robot swarm were overshadowed by the advantage provided by the US forces’ thermal sights. However, additional trials indicated that if both sides had been equipped with optical sights only, the early warning provided to the Iraqi forces by a robot swarm could have had a significant effect on the battle’s outcome.","PeriodicalId":44661,"journal":{"name":"Journal of Defense Modeling and Simulation-Applications Methodology Technology-JDMS","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77401682","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

Wargaming the use of intermediate force capabilities in the gray zone wg在灰色地带使用中间力量能力

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Journal of Defense Modeling and Simulation-Applications Methodology Technology-JDMS Pub Date : 2021-04-20 DOI: 10.1177/15485129211010227

Kyle D Christensen, P. Dobias

引用次数: 7

Can machine learning be used to forecast the future uncertainty of military teams? 机器学习可以用来预测军队未来的不确定性吗?

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Journal of Defense Modeling and Simulation-Applications Methodology Technology-JDMS Pub Date : 2021-03-28 DOI: 10.1177/1548512921999112

Ronald H. Stevens, Trysha Galloway

{"title":"Can machine learning be used to forecast the future uncertainty of military teams?","authors":"Ronald H. Stevens, Trysha Galloway","doi":"10.1177/1548512921999112","DOIUrl":"https://doi.org/10.1177/1548512921999112","url":null,"abstract":"Uncertainty is a fundamental property of neural computation that becomes amplified when sensory information does not match a person’s expectations of the world. Uncertainty and hesitation are often early indicators of potential disruption, and the ability to rapidly measure uncertainty would have implications for future educational and training efforts by targeting reflective discussions about past actions, supporting in-progress corrections, and generating forecasts about future disruptions. An approach is described combining neurodynamics and machine learning to provide quantitative measures of uncertainty. Models of neurodynamic information derived from electroencephalogram (EEG) brainwaves have provided detailed neurodynamic histories of US Navy submarine navigation team members. Persistent periods (25–30 s) of neurodynamic information were seen as discrete peaks when establishing the submarine’s position and were identified as periods of uncertainty by an artificial intelligence (AI) system previously trained to recognize the frequency, magnitude, and duration of different patterns of uncertainty in healthcare and student teams. Transition matrices of neural network states closely predicted the future uncertainty of the navigation team during the three minutes prior to a grounding event. These studies suggest that the dynamics of uncertainty may have common characteristics across teams and tasks and that forecasts of their short-term evolution can be estimated.","PeriodicalId":44661,"journal":{"name":"Journal of Defense Modeling and Simulation-Applications Methodology Technology-JDMS","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90975267","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: 4

Analysis of NOMA-OFDM 5G wireless system using deep neural network 基于深度神经网络的NOMA-OFDM 5G无线系统分析

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Journal of Defense Modeling and Simulation-Applications Methodology Technology-JDMS Pub Date : 2021-03-28 DOI: 10.1177/1548512921999108

Sharnil Pandya, M. Wakchaure, Ravi Shankar, J. R. Annam

引用次数: 21

Channel capacity analysis of non-orthogonal multiple access and massive multiple-input multiple-output wireless communication networks considering perfect and imperfect channel state information 考虑信道状态信息完备与不完备的非正交多址海量多输入多输出无线通信网络信道容量分析

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Journal of Defense Modeling and Simulation-Applications Methodology Technology-JDMS Pub Date : 2021-03-28 DOI: 10.1177/15485129211000139

Ravi Shankar, S. Nandi, A. Rupani

{"title":"Channel capacity analysis of non-orthogonal multiple access and massive multiple-input multiple-output wireless communication networks considering perfect and imperfect channel state information","authors":"Ravi Shankar, S. Nandi, A. Rupani","doi":"10.1177/15485129211000139","DOIUrl":"https://doi.org/10.1177/15485129211000139","url":null,"abstract":"In this paper, we investigate the non-orthogonal multiple access (NOMA) and massive multiple-input multiple-output (M-MIMO) techniques and through simulation, and a comparison is given between the NOMA and orthogonal multiple access techniques. Integrating NOMA with M-MIMO is a very challenging task. In this paper, for a single-cell system, NOMA is integrated with a M-MIMO system for better spectral and energy efficiency. Investigation of the multiple user gain is the focus of this work because the multiple user gain supports simultaneous transmission of multiple users in the case of the M-MIMO system. In this way, the M-MIMO will provide a 100 times channel capacity increase, which results in very high data transmission rate. In the modern communication system, achieving multiple user gain is a very difficult task when channel estimation error is present. The performance of the orthogonal multiple access as well as NOMA system significantly reduced in the presence of channel estimation error. However, most of the current schemes do not work well with imperfect perfect channel state information conditions. Simulation results closely agree with the theoretical outcomes.","PeriodicalId":44661,"journal":{"name":"Journal of Defense Modeling and Simulation-Applications Methodology Technology-JDMS","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78336426","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: 6