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An Optimal Solution for Dynamic Polar Diagram [article]

Ebrahim Ehsanfar, Bahram Sadeghi Bigham, Najmeh Madadi
In this paper, we present an algorithm to solve the Dynamic Polar Diagram in optimal time in which we insert some new points into the diagram one by one.  ...  Also, Dynamic Polar Diagram problem is a problem in which some points can be added to or removed from the point set of the Polar Diagram.  ...  (2010) An Optimal Solution for Dynamic Polar Diagram.Zenodo. 26th European Workshop on Computational Geometry, 2010  ... 
doi:10.6084/m9.figshare.14343998.v3 fatcat:7og6cjfxkjem5eo5mmjuyfeecy

An Optimal Solution for Dynamic Polar Diagram

Bahram Sadeghi Bigham Ebrahim Ehsanfar
2010 Zenodo  
In this paper, we present an algorithm to solve the Dynamic Polar Diagram in optimal time in which we insert some new points into the diagram one by one.  ...  Also, Dynamic Polar Diagram problem is a problem in which some points can be added to or removed from the point set of the Polar Diagram.  ...  In this paper, we presented two algorithms, both to solve the insertion case of Dynamic Polar Diagram in optimal time.  ... 
doi:10.5281/zenodo.3783865 fatcat:ipf733kwenedtjvgbfwn6wbecu

Dynamical modelling of a genetic algorithm

E.J. Solteiro Pires, J.A. Tenreiro Machado, P.B. de Moura Oliveira
2006 Signal Processing  
Three distinct fitness functions are used to study their influence in the GA dynamics.  ...  This work addresses the signal propagation and the fractional-order dynamics during the evolution of a genetic algorithm (GA).  ...  Consequently, this optimization GA leads to a different polar diagrams for HðjwÞ (see Fig. 11 ).  ... 
doi:10.1016/j.sigpro.2006.02.019 fatcat:76ilqghlnncixcrmdn6azew52y

Near-pole polar diagram of objects and duality

Bahram Sadeghi Bigham, Marzieh Eskandari, Maryam Tahmasbi
2012 Zenodo  
The polar diagram of a set of points in a plane and its extracted dual EDPD were recently introduced for static and dynamic cases.  ...  In this paper, the near-pole polar diagram NPPD for a set of points is presented.  ...  They also defined another graph named the extracted dual of the polar diagram (EDPD) (Fig. 1c) and presented an optimal algorithm for finding EDPD in time (n) for sorted sites and (n log n) for unsorted  ... 
doi:10.5281/zenodo.4818773 fatcat:rhjcl4rjgbew7dbvxdfy4xnbvu

Collision detection using polar diagrams

L. Ortega, F. Feito
2005 Computers & graphics  
Polar diagrams used as preprocessing can be applied to Collision Detection and many other geometric problems where the solution is given by angle processing.  ...  The new approach we propose in this paper computes a partition of the plane called Polar Diagram, in which every object in the scene is owner of a polar region as the locus of points with some common angle  ...  Once polar diagrams are calculated in optimal time O(n log n), the start point O is located into the East or the South pairs of diagrams in optimal logarithmic time.  ... 
doi:10.1016/j.cag.2005.08.026 fatcat:757eljmggng4doxltp2bl2mppe

Frenkel line and solubility maximum in supercritical fluids

C. Yang, V. V. Brazhkin, M. T. Dove, K. Trachenko
2015 Physical Review E  
The location of Frenkel line on the phase diagram is unknown for real uids. Here, we map the Frenkel line for three important systems: CO2, H2O and CH4.  ...  This provides an important demarcation on the phase diagram of these systems, the demarcation that separates two distinct physical states with liquid-like and gas-like properties.  ...  They are also "non-polar" and "polar" solvent, respectively, so they can dissolve "polar" and "non-polar" solutes, respectively.  ... 
doi:10.1103/physreve.91.012112 pmid:25679575 fatcat:gkkafytbxverneayl6kzoum5ke

Macrospin and micromagnetic studies of tilted polarizer spin-torque nano-oscillators

Yan Zhou, Hong Zhang, Yaowen Liu, Johan Åkerman
2012 Journal of Applied Physics  
Using nonlinear dynamical systems theory, we analytically studied a spin-torque device in which the magnetization of the polarizer (the fixed layer) is tilted at an arbitrary angle out of the thin-film  ...  Material dependencies of the dynamic and static state diagrams were also studied in the framework of the macrospin model.  ...  For F < 0, the complex conjugate eigenvalues define two complex eigenvectors generating an oscillatory trajectory towards equilibrium, characteristic of a spiral-like (S) solution. 50 In addition, in  ... 
doi:10.1063/1.4752265 fatcat:helmbdtl3ffbvoj3eprcl2rnay

Cross-country sailplane flight as a dynamic optimization problem

Bion L. Pierson, Jan L. De Jong
1978 International Journal for Numerical Methods in Engineering  
The helpful assistance of Ruth Kool of the Department of Mathematics of the THE, without whom the numerical results would have been generated at a much slower pace, played an important role here.  ...  Figure 1 . 1 Force and velocity diagrams for an equilibrium glide. Figure 2 . 2 Velocity polar for a particular sailplane in equilibrium glide (sketch only).  ...  Solution data for the ASW-15B drag polar are listed in Table I for V T -2 m/s and various final range values.  ... 
doi:10.1002/nme.1620121111 fatcat:5woasmnerjd7veo6u6sdcsq4yu

Mapping bifurcation structure and parameter dependence in quantum dot spin-VCSELs

Nianqiang Li, H. Susanto, B. R. Cemlyn, I. D. Henning, M. J. Adams
2018 Optics Express  
By tuning the aforementioned key parameters in turn we show how the dynamical regions evolve as a function of the intensity and polarization of the optical pump, as well as in the plane of the spin relaxation  ...  We consider a modified version of the spin-flip model (SFM) that describes optically pumped quantum dot (QD) spin-polarized vertical-cavity surface-emitting lasers (VCSELs).  ...  in the parameter space optimized for the above-mentioned applications.  ... 
doi:10.1364/oe.26.014636 pmid:29877498 fatcat:56gfhg7ppneoha6ens6hyorjda

Multi-Objective Weather Routing of Sailing Vessels

Marcin Życzkowski, Rafał Szłapczyński
2017 Polish Maritime Research  
Additionally, the method supports dynamic weather data: in its present version short-term, mid-term and long-term term weather forecasts are used during optimization process.  ...  The method has been implemented as an online SailAssistance application.  ...  ACKNOWLEDGMENTS The authors would like to thank Dr Bogusław Oleksiewicz for determining polar diagrams of sailing vessels used in this research. BIBLIOGRAPHY  ... 
doi:10.1515/pomr-2017-0130 fatcat:5djqht7pmnacjaqufeqf7wtgne

Particle Swarm Optimization: Dynamical Analysis through Fractional Calculus [chapter]

E. J. Solteiro Pires, J. A. Tenreiro Machado, P. B. de Moura Oliveir
2009 Particle Swarm Optimization  
Polar Diagram of H(jw) and G(jw) for I = 0.70 and a swarm size of pop = Amplitude Diagram of H(jw) and G(jw) for I = 0.7 and pop = 12 elements For evaluating the influence of the inertia parameter I and  ...  The polar diagrams illustrated by Figures 10 and 11 were obtained for the Easom and the Bohachevsky fitness functions, respectively.  ...  The system is initialized with a population of random solutions and searches for optima by updating generations. However, unlike GA, PSO has no evolution operators such as crossover and mutation.  ... 
doi:10.5772/6761 fatcat:z3ss2wz4zzhbllut4tczuoxgeu

Preparation and study of vitamin A palmitate microemulsion drug delivery system and investigation of co-surfactant effect

Solmaz Maleki Dizaj
2013 Journal of Nanostructure in Chemistry  
Samples of the microemulsion area were separated, and pseudo-ternary phase diagram was plotted for them.  ...  A titration technique was employed for the preparation of the samples. The phases were identified by visual inspection and polarized microscopy.  ...  Acknowledgements We would like to thank Urmia Payam Noor University and Dr Alireza Salehi Sadaghiani for his valuable guidance. Received: 2 May 2013 Accepted: 11 July 2013 Published:  ... 
doi:10.1186/2193-8865-3-59 fatcat:uag4p3h47rhj5jww2w6chuenoy

Method of Routing Ships Sailing in Dedicated Environment

Marcin Życzkowski
2017 Annual of Navigation  
An heuristic algorithm, and the appropriate application routing for fixed starting points and targets is designed in the method.  ...  As optimization criterion, measure sailing time T, and the number of maneuvers performed ω, are taken into account.  ...  the polar diagram (sailboat behavior).  ... 
doi:10.1515/aon-2017-0011 fatcat:j2x4ezhdwbc5tizjpfthaq274m

Feynman's solution of the quintessential problem in solid state physics [article]

Kun Chen, Kristjan Haule
2019 arXiv   pre-print
The former provides a powerful tool to construct a systematic expansion for a generic interacting system, while the latter allows optimization of a perturbation theory using a variational principle.  ...  Two of the most influential ideas developed by Richard Feynman are the Feynman diagram technique and his variational approach.  ...  Deng for stimulating discussion. This work is supported by the Simons  ... 
arXiv:1809.04651v2 fatcat:biojupyl5bbl3hm7lyfkrmachu

Zero-field precession and hysteretic threshold currents in a spin torque nano device with tilted polarizer

Yan Zhou, S Bonetti, C L Zha, Johan Åkerman
2009 New Journal of Physics  
Using non-linear system theory and numerical simulations we map out the static and dynamic phase diagram in zero applied field of a spin torque oscillator with a tilted polarizer (TP-STO).We find that  ...  The coexistence of static and dynamic states in zero magnetic field is unique to the tilted polarizer and leads to large hysteresis in the upper and lower threshold currents for TP-STO operation.  ...  Acknowledgments We thank J Persson for fruitful discussions.  ... 
doi:10.1088/1367-2630/11/10/103028 fatcat:2lqperz6mbacbaobmjrqto24oe
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