Results 21 to 30 of about 15,952 (266)

Optimizing Ambulance Allocation in Dynamic Urban Environments: A Historic Data-Driven Approach

open access: yesApplied Sciences, 2023
In this study, we present a methodology to solve the multi-period ambulance relocation problem based on historical data. We present a methodology to convert historical data in latitude–longitude coordinates into cell-based network data.
Seongho Kang, Taesu Cheong
doaj   +1 more source

Codimension 3 bifurcation from orbit-flip homoclinic orbit of weak type

open access: yesElectronic Journal of Qualitative Theory of Differential Equations, 2015
This article is devoted to the research of a new codimension 3 homoclinic orbit bifurcation, which is the orbit-flip of weak type. Such kind of homoclinic orbit is a degenerate case of the orbit-flip homoclinic orbit.
Qiuying Lu, Guifeng Deng, Hua Luo
doaj   +1 more source

Small Polygon Compression For Integer Coordinates

open access: yes, 2015
Publised at 3rd Conference on Weather Warnings and Communication ...
Jauhri, Abhinav   +2 more
openaire   +2 more sources

Hybrid mixed‐integer non‐linear programming approach for directional over‐current relay coordination [PDF]

open access: yesThe Journal of Engineering, 2019
This article proposes the optimal coordination problem of protective relays within a hybrid optimisation framework which is presented based on integer coded genetic algorithm (ICGA) and non‐linear programming (NLP). The optimal coordination problem of directional overcurrent relays (DOCRs) is implemented while aimed at finding the optimal plug setting ...
Mohammad Sadegh Javadi   +4 more
openaire   +3 more sources

Orthant spanning simplexes with minimal volume

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 2003
A geometry problem is to find an (n−1)-dimensional simplex in ℝn of minimal volume with vertices on the positive coordinate axes, and constrained to pass through a given point A in the first orthant. In this paper, it is shown that the optimal simplex is
Michele Elia
doaj   +1 more source

Inhomogeneously polarized light fields: polarization singularity indices derived by analogy with the topological charge

open access: yesКомпьютерная оптика, 2022
In this work, we study several different vector and hybrid light fields, including those with multiple polarization singularities. We derive polarization singularity indices by adopting a well-known M.V.
V.V. Kotlyar, A.A. Kovalev, V.D. Zaitsev
doaj   +1 more source

Polyhedral Gauss sums, and polytopes with symmetry

open access: yesJournal of Computational Geometry, 2016
We define certain natural finite sums of $n$'th roots of unity, called $G_P(n)$, that are associated to each convex integer polytope $P$, and which generalize the classical $1$-dimensional Gauss sum $G(n)$ defined over $\mathbb Z/ {n \mathbb Z}$, to ...
Romanos Diogenes Malikiosis   +2 more
doaj   +1 more source

Quantum Maps with Memory from Generalized Lindblad Equation

open access: yesEntropy, 2021
In this paper, we proposed the exactly solvable model of non-Markovian dynamics of open quantum systems. This model describes open quantum systems with memory and periodic sequence of kicks by environment. To describe these systems, the Lindblad equation
Vasily E. Tarasov
doaj   +1 more source

Vector Arithmetic in the Triangular Grid

open access: yesEntropy, 2021
Vector arithmetic is a base of (coordinate) geometry, physics and various other disciplines. The usual method is based on Cartesian coordinate-system which fits both to continuous plane/space and digital rectangular-grids.
Khaled Abuhmaidan   +2 more
doaj   +1 more source

Regge conformal blocks from the Rindler-AdS black hole and the pole-skipping phenomena

open access: yesJournal of High Energy Physics, 2021
We study a holographic construction of conformal blocks in the Regge limit of four-point scalar correlation functions by using coordinates of the two-sided Rindler-AdS black hole.
Keun-Young Kim   +2 more
doaj   +1 more source

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