Modeling and simulation of swarms for collecting objects

Robotica ◽  
2005 ◽  
Vol 24 (3) ◽  
pp. 315-324 ◽  
Author(s):  
Yangmin Li ◽  
Xin Chen
Keyword(s):  
Modeling And Simulation ◽  
Mathematic Model ◽  
Macroscopic Model ◽  
Global Dynamics ◽  
Individual Based Model ◽  
Framework Model ◽  
Home Area ◽  
The Individual

A mathematic model is established to describe a swarm with multi-behavior. Regarding a swarm designed for cooperative task, we propose a model which includes a macroscopic model and a individual-based model. The macroscopic framework model describes global dynamics of swarms, which is normally expressed by dynamical populations' densities with different behaviors, while the individual-based framework model describes a individual agent's trajectory. Based on these models, we prove that all objects can be collected to the “home” area under conditions of individual agents subject to sensor constraints.

scholarly journals A multi-layer model for self-propelled disks interacting through alignment and volume exclusion

2015 ◽  
Vol 25 (13) ◽  
pp. 2439-2475 ◽  
Author(s):  
Pierre Degond ◽  
Laurent Navoret
Keyword(s):  
Sperm Cell ◽  
Macroscopic Model ◽  
Layer Model ◽  
Individual Based Model ◽  
Macroscopic Models ◽  
Numerical Comparisons ◽  
Self Organized ◽  
The Mean ◽  
The Individual ◽  
Cell Collective

We present an individual-based model describing disk-like self-propelled particles moving inside parallel planes. The disk directions of motion follow alignment rules inside each layer. Additionally, the disks are subject to interactions with those of the neighboring layers arising from volume exclusion constraints. These interactions affect the disk inclinations with respect to the plane of motion. We formally derive a macroscopic model composed of planar self-organized hydrodynamic (SOH) models describing the transport of mass and evolution of mean direction of motion of the disks in each plane, supplemented with transport equations for the mean disk inclination. These planar models are coupled due to the interactions with the neighboring planes. Numerical comparisons between the individual-based and macroscopic models are carried out. These models could be applicable, for instance, to describe sperm-cell collective dynamics.

scholarly journals Energy–Economy Coupled Simulation Approach and Simulator Based on Invididual-Based Model

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2771
Author(s):  
Jisong Zhu ◽  
Zhaoxia Jing ◽  
Tianyao Ji ◽  
Nauman Ali Larik
Keyword(s):  
Modeling And Simulation ◽  
Distributed Simulation ◽  
Simulation Method ◽  
Energy System ◽  
Simulation Approach ◽  
Individual Based Model ◽  
Multi Scale ◽  
Integrated Energy System ◽  
Energy Economy ◽  
The Individual

An integrated energy system, referred to specifically as a heterogeneous energy system that combines cooling, heating, power, etc., is a dynamic system containing continuous as well as discrete behaviors on both technical and economic levels. Currently, the comprehensive utilization of multiple forms of energy and the implementation of the energy market have made the simulation of such a system very complicated, which is reflected in two aspects. First, the simulation model becomes complex and varied. Second, the time-varying characteristics of the models are quite diverse. Therefore, a standard and normative modeling and simulation method is urgently needed. This work aims to obtain a compatible modeling and simulation method for the energy economy coupling system. The individual-based model is widely used to describe organisms in an ecology system that are similar to the energy–economy coupled system. Inspired by this, a general simulation approach based on the individual-based model is proposed in this paper to overcome these existing problems. The standard formal expression model is built, then its structure and elements explained in detail, and multi-scale time simulation supported to model and simulate an integrated energy system that is coupled with markets. In addition, a simulator is designed and implemented based on multi-agent framework and model-view-controller architecture. Finally, a simulation case of a conceived scenario was designed and executed, and the results analysis proved the validity and versatility of the proposed approach. The proposed method has the advantages of model standardization, multi-scale time compatibility, distributed simulation capability, and privacy protection. These advantages support and strengthen each other. Through these studies, a systematic approach was formed that could improve the standardization of modeling and simulation in the energy–economy research area.

Effect of EPS on biofilm structure and function as revealed by an individual-based model of biofilm growth

2001 ◽  
Vol 43 (6) ◽  
pp. 135-135 ◽  
Author(s):  
J.-U. Kreft ◽  
J. W. Wimpenny
Keyword(s):  
Dimensional Space ◽  
Three Dimensional ◽  
Structure And Function ◽  
Individual Based Model ◽  
Biofilm Growth ◽  
Rate Dependent ◽  
Binding Forces ◽  
The Individual ◽  
And Function ◽  
Biofilm Structure

We have simulated a nitrifying biofilm with one ammonia and one nitrite oxidising species in order to elucidate the effect of various extracellular polymeric substance (EPS) production scenarios on biofilm structure and function. The individual-based model (IbM) BacSim simulates diffusion of all substrates on a two-dimensional lattice. Each bacterium is individually simulated as a sphere of given size in a continuous, three-dimensional space. EPS production kinetics was described by a growth rate dependent and an independent term (Luedeking-Piret equation). The structure of the biofilm was dramatically influenced by EPS production or capsule formation. EPS production decreased growth of producers and stimulated growth of non-producers because of the energy cost involved. For the same reason, EPS accumulation can fall as its rate of production increases. The patchiness and roughness of the biofilm decreased and the porosity increased due to EPS production. EPS density was maximal in the middle of the vertical profile. Introduction of binding forces between like cells increased clustering.

Integrating variable traits and inheritance into the individual-based model LAVESI for evaluation of their importance for larch forest performance under future adverse conditions

2021 ◽  
Author(s):  
Josias Gloy ◽  
Stefan Kruse ◽  
Ulrike Herzschuh
Keyword(s):  
Boreal Forest ◽  
Drought Resistance ◽  
Migration Rate ◽  
Extinction Risk ◽  
Climate Data ◽  
The South ◽  
Trait Variation ◽  
Individual Based Model ◽  
Future Projections ◽  
The Individual

<p>With changing climate boreal forest need to shift their distribution further north and become threatened by droughts in the south. However, whether boreal forest species can adapt to novel situations and reduce their extinction risk is largely unknown but crucial to predict future performance of populations. Exploring variable traits and ultimately trait inheritance in an individual-based model could improve our understanding and help future projections.</p><p> </p><p>Hence, we updated the individual-based spatially explicit vegetation model LAVESI to allow for variation in traits values that are normally distributed and the option of determining the trait values based on the parental values, thus allowing full inheritance.</p><p> </p><p>Using historical climate data and future projections, we ran simulation experiments of <em>Larix gmelinii</em> stands in the two areas of interest, the northern treeline expanding due to increasing temperatures, and the southern area experiencing increased drought. At these regions, the trait of ‘seed weight’ regulate migration further north and the ‘drought resistance’ protecting stands in the south, a comparison of the model variants: uniform, variable and inherited traits is being performed.</p><p>The results will be presented and will allow to disentangle how far migration rate and survival rate are influenced by this. In preliminary tests, it was already shown that both the allowing trait variation and inheritance led to an increase in migration rate, with the latter having a stronger impact. Similarly, the early tests for the drought resistance show that in changing temperatures leading to droughts the trait variation allows for adaption and leads to better surviving populations.</p><p> </p><p>We expect that variable traits ensure that if the environment changes necessary trait variants are available. Inheritance could let the populations adapt to environments and promote successful trait values and therefore lead to more optimised populations, that are able to spread faster and be as resilient as needed.</p><p> </p><p>With this, we show that implementing trait variation and inheritance may contribute to creating more accurately predicting models and understanding responses of boreal forests to global change.</p>

scholarly journals Towards an Evolutionary Understanding of the Current Global Socio-economic Crisis and Restructuring: From a Conjunctural to a Structural and Evolutionary Perspective

2018 ◽  
Vol 9 (1) ◽  
pp. 15 ◽  
Author(s):  
Charis Michael Vlados ◽  
Nikolaos Deniozos ◽  
Demosthenes Chatzinikolaou ◽  
Michail Demertzis
Keyword(s):  
Economic Crisis ◽  
Chaos Theory ◽  
Economic Research ◽  
Global Dynamics ◽  
Evolutionary Perspective ◽  
Economic Perspective ◽  
System Science ◽  
Methodological Principles ◽  
The Individual ◽  
New Generation

The current global socio-economic crisis and restructuring reshapes the terms of study of the global dynamics as a whole. A new generation of interdisciplinary socio-economic research on the matter in question seems to be progressively emerging in international literature.Against this background, it gradually emerges the understanding, that any attempt to interpret the individual contemporary socio-economic phenomena, which relate to the crisis and the attempt to restructure globalization, can only be inadequate and ineffective, since it fails to fully approach the current dynamics of globalization in synthetic, holistic terms.In this direction, new interpretative approaches seem to intensify interpenetration and conceptual syntheses between the different fields of socio-economic sciences, in an increasingly unified perspective, by extensively "borrowing" –in a direct and indirect way– methods and theoretical "lenses" derived from system science, chaos theory, and evolutionary economics.In the depth of this methodological rearrangement, according to the position put forward in the following paper, it is crucial that an effort is made to move from a conjunctural to a structural perception of the crisis. Ultimately, the great challenge for the field of study of global dynamics nowadays is the transition from the methodological principles of the traditional mechanistic interpretative method to a coherent and integrated evolutionary socio-economic perspective.

A High-Efficiency Cascade Multilevel Class-D Amplifier

2012 ◽  
Vol 482-484 ◽  
pp. 559-564
Author(s):  
Guo Hua Xu ◽  
Ying Zhang ◽  
Ming Dong ◽  
Lu Wei Xu
Keyword(s):  
Sliding Mode Control ◽  
Power Amplifier ◽  
High Efficiency ◽  
Sliding Mode ◽  
Mathematic Model ◽  
Total System ◽  
Mode Control ◽  
Class D Amplifier ◽  
Class D ◽  
The Individual

A switch-mode power amplifier based on a cascaded multicell multilevel circuit topology is introduced in the paper. Due to the Carrier-Based phase-shifted modulation of the individual switching cells, the output voltage ripple of the total system is considerably small. Compared with traditional class- AB amplifiers that are very poor at efficiency, the proposed amplifier has the efficiency of 90% at the smaller distortion level. A multilevel class-D amplifier’s mathematic model is analyzed. The paper lays emphasis on the design of the sliding mode control and deducts the parameters, and then develops a 2kW cascade multilevel class-D power amplifier adopting sliding mode control. The research results show that this kind of amplifier increases the system bandwidth, which provides the system with fast following performance and stability, high efficiency, and low THD value of output signals.

scholarly journals HUMAN BEHAVIORAL CHANGES AND ITS IMPACT IN DISEASE MODELING

2015 ◽  
Vol 77 (33) ◽  
Author(s):  
Teoh Shian Li ◽  
Jane Labadin ◽  
Phang Piau ◽  
Ling Yeong Tyng ◽  
Shapiee Abd Rahman
Keyword(s):  
Uniform Distribution ◽  
Rural Areas ◽  
Disease Modeling ◽  
Demographic Factors ◽  
Behavioral Changes ◽  
Individual Based Model ◽  
Preventive Actions ◽  
Urban And Rural Areas ◽  
The Individual ◽  
The Impact

One of the threats of the world health is the infectious diseases. This leads to the raise of concern of the policymakers and disease researchers. Vaccination program is one of the methods to prevent the vaccine-preventable diseases and hence help to eradicate the diseases. The impact of the preventive actions is related to the human behavioral changes. Fear of the diseases will increase one’s incentive in taking the preventive actions to avoid the diseases. As human behavioral changes affecting the impact of the preventive actions, the individual-based model is constructed to incorporate the behavioral changes in disease modeling. The agents in the individual-based model are allowed to move randomly and interact with each other in the environment. The interactions will cause the disease viruses as well as the fearfulness to be spread in the population. In addition, the individual-based model can have different environment setups to distinguish the urban and rural areas. The results shown in this paper are divided into two subsections, which are the justification of using uniform distribution as random number generator, and the variation of disease spread dynamics in urban and rural areas. Based on the results, the uniform distribution is found to be sufficient in generating the random numbers in this model as there is no extreme outlier reported in the experiment. We have hypothesized the individuals in urban area to have higher level of fearfulness compared to those in rural area. However, the preliminary results of the survey conducted show a disagreement with the hypothesis. Nevertheless, the data collected still show two distinct classes of behavior. Thus, the distinction does not fall into the samples taken from rural or urban areas but perhaps more on the demographic factors. Therefore, the survey has to be study again and demographic factors have to be included in the survey as we could not distinguish the level of fearfulness by areas.  

Numerical Modeling and Experimental Research of the Perforation Phenomenon of Certain Materials Used for Individual Protection by Bullets

2017 ◽  
Vol 23 (3) ◽  
pp. 174-179
Author(s):  
Florin Ilie ◽  
Nicolae Moro
Keyword(s):  
Numerical Modeling ◽  
Modeling And Simulation ◽  
Experimental Research ◽  
Ballistic Protection ◽  
Different Types ◽  
Individual Protection ◽  
Range Testing ◽  
Materials Used ◽  
The Individual ◽  
The Impact

Abstract The paper captures two aspects related to the phenomenon of impact between bullets and different types of materials used for the individual protection of the militaries, for the same type of ammunition and for the same configuration of the ballistic protection system, both in the case of the activity of experimental shooting range testing, as well as in the case of the modeling and simulation of the impact between the bullet and the protection materials.

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