{"title":"A quantitative comparison of two different models of minefield transit","authors":"Mikel D Petty","doi":"10.1177/15485129241257528","DOIUrl":"https://doi.org/10.1177/15485129241257528","url":null,"abstract":"Naval mines are used to cause damage and inflict casualties on ships and to deny access to mined areas. Two distinctly different Monte Carlo models of surface ships transiting minefields were implemented and compared. An analytic model represents mines abstractly as mine density within the minefield. It determines the probability of a ship encountering a mine as a ratio of the area of the ship’s track through the minefield, with width equal to the mines’ effective radius and the area of the minefield. A geometric model represents the ship’s track and the mines’ locations explicitly. It determines whether a ship encounters a mine using a calculation of the distance between a ship’s track and the mines’ locations. The two models’ results were quantitatively compared for multiple values of five experimental variables: minefield dimensions, mine density, mine placement method, ships per group, and ship transit procedure. Each model was executed for each combination of experimental variable values and their results were compared to determine whether the models produced comparable results. In addition, the effectiveness of two mine placement methods at disabling ships and two ship transit procedures at avoiding mines were also compared. All comparisons used statistical hypothesis tests.","PeriodicalId":508000,"journal":{"name":"The Journal of Defense Modeling and Simulation: Applications, Methodology, Technology","volume":"14 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141810333","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}
{"title":"Cutting edge technologies for future military applications: trends and challenges","authors":"Michael Gargalakos","doi":"10.1177/15485129241263596","DOIUrl":"https://doi.org/10.1177/15485129241263596","url":null,"abstract":"","PeriodicalId":508000,"journal":{"name":"The Journal of Defense Modeling and Simulation: Applications, Methodology, Technology","volume":"57 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141844166","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}
S. Jakovlev, Tomas Eglynas, Mindaugas Jusis, Miroslav Voznak
{"title":"Developing an IoT-enabled probabilistic model for quick identification of hidden radioactive materials in maritime port operations to strengthen global supply chain security","authors":"S. Jakovlev, Tomas Eglynas, Mindaugas Jusis, Miroslav Voznak","doi":"10.1177/15485129241251490","DOIUrl":"https://doi.org/10.1177/15485129241251490","url":null,"abstract":"Uncovering hidden radioactive materials continues to be a major hurdle in worldwide supply chains. Recent research has not adequately investigated practical Internet of Things (IoT)-based approaches for improving and implementing efficient data fusion techniques. Current systems often misuse resources, leading to security vulnerabilities in typical settings. Our research delves into the fundamental principles of detection using both single and multiple sensor configurations, adopting a probabilistic method for merging data. We introduce a model aimed at accelerating the detection of radiation emissions in actual port operations. The results highlight the model’s effectiveness in rapid identification and determine the best conditions for its application in scenarios involving stacked containers, whether they are on ships or positioned in storage areas.","PeriodicalId":508000,"journal":{"name":"The Journal of Defense Modeling and Simulation: Applications, Methodology, Technology","volume":" 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141001419","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}
{"title":"Statement of requirements on the accuracy of rocket CFD analysis using exterior ballistics for example rocket models","authors":"A. Baghiyan, H. Sargsyan, A. Grigoryan","doi":"10.1177/15485129241247042","DOIUrl":"https://doi.org/10.1177/15485129241247042","url":null,"abstract":"In this paper, the problem of acceptable accuracy of a rocket’s aerodynamic characteristics obtained from CFD (computational fluid dynamics) analysis for defining its aerodynamic characteristics is considered from the point of view of exterior ballistics, particularly by the estimation of the rocket’s simulated flight range change caused by CFD errors. The results obtained in this paper allow stating the requirement on acceptable accuracy of defining the aerodynamic characteristics for developing new rockets through CFD analysis based on several examples, which can be propagated to other cases of rocket design and development. Using this study as a method, the CFD engineers who work on rocket design and development can estimate the accepted accuracy margin of their CFD analysis and research solutions to get reliable results for the expected flight characteristics of the rocket.","PeriodicalId":508000,"journal":{"name":"The Journal of Defense Modeling and Simulation: Applications, Methodology, Technology","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140671365","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}
Andrew G Gelbard, Phillip R. Jenkins, Matthew J. Robbins
{"title":"Enhancing military medical evacuation dispatching with armed escort management: comparing model-based reinforcement learning approaches","authors":"Andrew G Gelbard, Phillip R. Jenkins, Matthew J. Robbins","doi":"10.1177/15485129241229762","DOIUrl":"https://doi.org/10.1177/15485129241229762","url":null,"abstract":"The military medical evacuation (MEDEVAC) dispatching problem involves determining optimal policies for evacuating combat casualties to maximize patient survivability during military operations. This study explores a variation of the MEDEVAC dispatching problem, focusing on controlling armed escorts using a Markov decision process (MDP) model and model-based reinforcement learning (RL) approaches. A discounted, continuous-time MDP model over an infinite horizon is developed to maximize the expected total discounted reward of the system. Two model-based RL solution approaches are proposed: one utilizing semi-gradient descent Q-learning and another employing semi-gradient descent SARSA. A computational example, set in western and central Africa during contingency operations, assesses the performance of the RL-generated policies against the myopic policy, which military medical planners currently employ. Solution quality is derived from expected response time, a crucial determinant of life-saving potential in MEDEVAC operations. The research also explores sensitivity analysis and excursion scenarios to evaluate the RL-generated policies further. By explicitly controlling armed escort assets, dispatching authorities can better manage the location and allocation of these resources throughout combat operations. The findings of this study have the potential to inform military medical planning, operations, and tactics, ultimately leading to improved MEDEVAC system performance and higher patient survivability rates.","PeriodicalId":508000,"journal":{"name":"The Journal of Defense Modeling and Simulation: Applications, Methodology, Technology","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140716997","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}
{"title":"Assessing the US foreign assistance activities impact on violent conflicts","authors":"Daniel F Feze, Mark A Gallagher","doi":"10.1177/15485129241240760","DOIUrl":"https://doi.org/10.1177/15485129241240760","url":null,"abstract":"The Global Fragility Act, H.R.2116 116th Congress, directs the Department of State to establish an interagency initiative to stabilize conflict-affected areas and prevent violence globally. We propose and demonstrate an approach to evaluate the success of funding these initiatives. The United States Agency for International Development (USAID) has identified deteriorating economies, weak, or illegitimate political institutions, and competition over natural resources as causes of violence, extremism, and instability. The agency prioritizes mitigating the causes and consequences of violent conflicts, instability, and extremism and funds corresponding programs. Focused on military aid, we quantitatively assess these programs effectiveness at preventing or deescalating conflicts during 2010 to 2020. Our statistical analysis shows the funds during that period did not have an immediate impact on countries prone to violence. However, cumulative long-term relationships exist between some funds and the global conflict levels. As the total amount of 5 years cumulative Defense Security Cooperation Agency (DSCA) implemented funds increases, the total number of countries not-in-conflict increases while the total number of the most violent countries decreases. Those funds also correlate to the decline in total conflict levels during that timeframe. This quantitative approach assesses the aggregate effectiveness of aid across various countries.","PeriodicalId":508000,"journal":{"name":"The Journal of Defense Modeling and Simulation: Applications, Methodology, Technology","volume":"14 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140732872","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}
{"title":"Estimation of terminal ballistics parameters for several 7.62×51 mm projectiles using numerical simulations","authors":"Catovic Alan","doi":"10.1177/15485129241240768","DOIUrl":"https://doi.org/10.1177/15485129241240768","url":null,"abstract":"Six widely used 7.62 ×51 mm projectile types (M80, M61, P80/1, M80A1, M1158, and M993) were subjected to the analysis in this paper. Numerical simulations (Ansys Autodyn) of projectile impacts on hard steel targets were performed as part of this analysis. Projectiles had the same impact velocity (800 m/s). This allowed evaluation of the projectile’s design and material’s effect on its performance against a hard steel target. Validation of the numerical model and used materials was first performed, using available experimental data. A short description and Computer-Aided Design (CAD) model of projectiles is also given. Comparing the M1158 projectile to other AP projectiles taken into consideration, it was concluded that the former had a much deeper penetration depth into a hard steel target (Armox 500T). The projectile’s penetrating capability is greatly impacted by the material selection used for its component parts. Assuming all other factors remain constant, penetrators with higher density and harderness can achieve deeper penetration. Under the same conditions, an increase in penetrator length results in an increase in penetration depth. The absence of a gilding metal jacket in the projectile’s frontal ogive section can decrease energy required to remove the jacket during the penetration, hence increasing the projectile’s penetration capabilities.","PeriodicalId":508000,"journal":{"name":"The Journal of Defense Modeling and Simulation: Applications, Methodology, Technology","volume":"121 30","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140380155","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}
{"title":"Analysis comparison model of ROC-TOPSIS, ROC-WP, and ROC-Electre methods for supporting the funding decision to micro-enterprises Indonesia","authors":"Noerul Hanin, Hendri Purwanto","doi":"10.1177/15485129241235681","DOIUrl":"https://doi.org/10.1177/15485129241235681","url":null,"abstract":"Micro-business is an essential business unit that supports the economies of countries in the world, including Indonesia. Unfortunately, micro-entrepreneurs often find difficulties to obtain financial assistance from government to develop their businesses. In Indonesia, the smallest number of micro industries can be found in West Papua Province, where one of the underdeveloped areas in the province is the Sorong City. Therefore, a study was conducted to determine the application of decision support methods in selecting micro-enterprises in Sorong that are eligible for business funding. The decision support method chosen is the collaboration between the Rank-Order Centroid (ROC) method, Technique for Order Preference by Similarity to Ideal Solution (TOPSIS), Weight Product (WP), and Elimination Et Choix Traduisant la Realite (Electre). With the analysis conducted on 10 samples of micro-enterprises in Sorong City, it was found that the micro-enterprises that were most eligible to receive assistance is Raya Helm based on ROC-TOPSIS, ROC-WP, and ROC-Electre. Then, sensitivity analysis results the ROC-Electre as the best method with the highest sensitivity percentage. Therefore, the implementation of these methods for supporting the funding decision to micro-enterprises in Sorong was successfully carried out with the output being the micro-enterprise rating results.","PeriodicalId":508000,"journal":{"name":"The Journal of Defense Modeling and Simulation: Applications, Methodology, Technology","volume":" 83","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140384586","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}
{"title":"Using combat simulations to determine tactical responses to new technologies on the battlefield","authors":"Vikram Mittal, James E Fenn","doi":"10.1177/15485129241239364","DOIUrl":"https://doi.org/10.1177/15485129241239364","url":null,"abstract":"Although military technology can provide a tactical edge in combat, its efficacy often diminishes once the opposing force adapts. To address this issue, the study proposes a systematic approach to predict, model, and quantify the responses of soldiers on the battlefield to new technology. The method uses virtual simulations to identify changes in behavior and tactics, which are then modeled in constructive simulations to quantify lethality, survivability, and mission effectiveness. The approach is demonstrated through a case study on grenade-equipped quadcopters using the Infantry Warrior Simulation, a constructive simulation, and Virtual Battlespace 3.0, a virtual simulation. The study found that this tactic was initially successful at disrupting operations of soldiers. However, after seven iterations, the soldiers implemented changes in their tactics to minimize the effects of the drone. This process provides insight into better understanding the dynamic, responsive nature of the modern battlefield.","PeriodicalId":508000,"journal":{"name":"The Journal of Defense Modeling and Simulation: Applications, Methodology, Technology","volume":" 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140215789","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}
Hasmady Alim, Ananthan Subramaniam, Norazman Mohamad Nor, Amelia Yuliana Abd Wahab
{"title":"Measuring operational cognitive readiness of military personnel using Joint Theater Level Simulation System (JTLS)","authors":"Hasmady Alim, Ananthan Subramaniam, Norazman Mohamad Nor, Amelia Yuliana Abd Wahab","doi":"10.1177/15485129241239669","DOIUrl":"https://doi.org/10.1177/15485129241239669","url":null,"abstract":"Cognitive Readiness refers to military personnel who are cognitively ready to perform effective and efficient roles in military operations with the necessary knowledge, skills, and abilities (KSAs). These KSAs are essential for critical thinking, problem-solving and decision-making. Military personnel at each level in the Malaysian Armed Forces (MAF) must be cognitively ready for military deployment. To enhance the cognitive readiness of military personnel at the operational level, a training design—scenario-based training (SBT) has been developed by the Malaysian Armed Forces Staff College (MAFSC) to develop cognitive readiness for course participants (CPs) who attended staff courses. Joint Theater Level Simulation (JTLS) has been used to analyze the Line of Operation (LOO) that has been produced by the course participant. The results show that SBT affected the development of cognitive readiness to prepare military personnel at the operational level through Joint Warfare environment exercises and tested by Modeling and Simulation (M&S).","PeriodicalId":508000,"journal":{"name":"The Journal of Defense Modeling and Simulation: Applications, Methodology, Technology","volume":" 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140218882","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}