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On the optimality of grid cells
[article]
2016
arXiv
pre-print
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Grid cells are widely believed to be involved in path integration, that is, the maintenance of a location state through the summation of small displacements. ...
In two dimensions, under additional assumptions it can be shown that measurement sensitivity is optimized by the product of two sinusoids, again yielding a grid-like pattern. ...
Acknowledgment: Many thanks to Reza Moazzezi for fruitful collaboration during the early stages of this work, to Umesh Vazirani for illuminating discussions, and to Christos-Alexandros Psomas for help ...
arXiv:1606.04876v1
fatcat:jkgfwzcbfbfsjp5qksqjxticva
A user centric self-optimizing grid-based approach for antenna steering based on call detail records
2016
2016 IEEE Wireless Communications and Networking Conference
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To be able to maximize average user throughput on a cell level, we perform optimization of sector azimuth angles based on user centric weighted grids. ...
In comparison to an optimal brute-force method that takes into account the location of every user to optimize the azimuth angles in a cell, we show that the proposed grid based self-optimization approach ...
Optimization of azimuth angles in a cell are based on grid weights, thus different grid sizes, yield different weights and in turn affect the optimization of the azimuth angles. ...
doi:10.1109/wcnc.2016.7564931
dblp:conf/wcnc/BitarIR16
fatcat:ewhcn7nchbeofkgzyhv2mbpmwq
Vector Spatial Big Data Storage and Optimized Query Based on the Multi-Level Hilbert Grid Index in HBase
2018
Information
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In the paper, we focus on the storage and topological query of vector polygon geometry data in HBase, and the rowkey in the HBase table is the concatenation of the Hilbert value of the grid cell to which ...
Finally, based on the Q-HBML index, two query optimization strategies and an optimized topological query algorithm, ML-OTQ, are presented to optimize the topological query process and enhance the topological ...
Conflicts of Interest: The authors declare no conflict of interest. ...
doi:10.3390/info9050116
fatcat:5rb7npier5fnvanzvclg5grwl4
Fabrication of High Voltage Modules by Optimization of Performances of Reduced Area Silicon Solar Cells
2016
Energy Procedia
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The optimization of the front metallization grid allows the fabrication of small area cells with similar efficiency as 6 inches cells. ...
First, we investigated the influence of the cell dimension on the efficiency. ...
Based on the cell front grid optimization, table 1 shows the performance of the mini-modules with 12 cleaved cells and with one reference 6 inches cell. ...
doi:10.1016/j.egypro.2016.07.049
fatcat:3chz2xqqlrbfnhlzq6yxv5hfmq
Determination of discrete sampling grids with optimal topological and spectral properties
[chapter]
1996
Lecture Notes in Computer Science
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It is shown here that those grids have advantages with respect to the classically used 23 n grid. The proposed 3D grids are used to achieve surface extraction from volume data. ...
This paper proposes 2D, 3D and 4D discrete sampling grids with optimal topological and spectra] properties. ...
The ratio between the two grids is x/~/4, what means that the optimal grid has the 55.90% of samples of the Z 4 grid. ...
doi:10.1007/3-540-62005-2_15
fatcat:dfpft7up2rfwzbxplcvvuz5vtm
Optimization of three-dimensional computational grids
1986
Journal of Aircraft
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Qualitatively, the desirable properties of the master cell are stated as:
1) Smoothness: The master cell is smooth if the change in cell volume from one of its grid cells to the next is minimal, in all ...
The grid is essentially optimized after 20 iterations. In spite of a nearly constant smoothness, after 30 iterations one singular master cell appears at the nose tip. ...
doi:10.2514/3.45323
fatcat:t63eaohjhnb4bjmh7aanfiz3te
Duality and Dimensionality Reduction Discrete Line Generation Algorithm for a Triangular Grid
2018
ISPRS International Journal of Geo-Information
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Third, the two-dimensional discrete line model is solved by transforming it into a one-dimensional optimal wandering path model. ...
In this study, we propose a method for constructing a discrete line mathematical model for a triangular grid based on a "weak duality" hexagonal grid, to overcome the drawbacks of existing discrete line ...
Conflicts of Interest: The authors declare no conflict of interest. ...
doi:10.3390/ijgi7100391
fatcat:pswopfjphbhjbmjttvbjpsigjm
Layout Generator with Flexible Grid Assignment for Area Efficient Standard Cell
2015
IPSJ Transactions on System LSI Design Methodology
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The generator reduces the cost of library design and enables an optimization of each cell with detailed layout information that can be used to estimate the performance of the cell under design. ...
It can generate an area efficient layout from a virtual-grid symbolic layout with the ability of flexible grid positioning that considers local design rules enforced in a scaled technology. ...
Since the available number of horizontal wire track on the mask layout depend on the PMOS and NMOS width and it is affected by mask design rule and target cell height, GridY of virtual grid is not able ...
doi:10.2197/ipsjtsldm.8.131
fatcat:2h2n2pm3sfehzi733excdvt46i
Optimized Icosahedral Grids: Performance of Finite-Difference Operators and Multigrid Solver
2013
Monthly Weather Review
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This paper discusses the generation of icosahedral hexagonal-pentagonal grids, optimization of the grids, how optimization affects the accuracy of finite-difference Laplacian, Jacobian, and divergence ...
Three different grid optimization methods are compared through an error convergence analysis. The optimization process increases the accuracy of the operators. ...
The grid distances on the optimized grid are slightly less uniform than those on the unoptimized IHP grid. ...
doi:10.1175/mwr-d-12-00236.1
fatcat:6em3bljfindoxlrsdbwicyo2tu
Isotropic Grids Revisited: A Numerical Study of Solar Cell Electrode Geometries
2022
IEEE Transactions on Electron Devices
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We present a simple numerical framework for modeling the shadow and resistive losses in circular H-bar and isotropic grids and for optimizing the pitch and width of the designs. ...
losses in the cell material and metal lines. ...
Convex optimization of the numerical expressions was used to rapidly identify near-optimal configurations of H-bar and isotropic grids on circular solar cells with a single central current sink. ...
doi:10.1109/ted.2022.3174810
fatcat:5pxxvun6t5dvxf5hjb4b7zo6gm
Aerodynamic Shape Optimization using Discrete Adjoint Formulation based on Overset Mesh System
2007
International Journal of Aeronautical and Space Sciences
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A smooth geometric modification on the overlapped surface boundaries and evaluation of analytic grid sensitivities can be performed by Spline patch and mapping from physical grids to the patched Spline ...
Moreover, a new postprocessing method, Spline-Boundary Intersecting Grid (S-BIG) scheme, is proposed by considering the ratio of cell area for more refined prediction of aerodynamic coefficients and convenient ...
Assuming that Zipper grid scheme is reconstruction of grids on the level of a block, S-BIG is reconstitution of grids on the level of a cell. ...
doi:10.5139/ijass.2007.8.1.095
fatcat:g6g6qtaesnevfagykq4qqo3roy
From 1 Sun to 10 Suns c-Si Cells by Optimizing Metal Grid, Metal Resistance, and Junction Depth
2009
International Journal of Photoenergy
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Step by step optimization of commercial cell in terms of grid geometry, junction depth, and electroplating of the front metal contacts is proposed. ...
The optimized cell with grid optimization, junction optimization, electroplating, and junction optimized with electroplated contacts cell gives resistive power loss of 20%, 16%, 11%, and 8%, respectively ...
Case-3: Electroplated Front Grid Contacts on Solar Cells Front metal grid (fingers and bus-bars) and back Al metal contacts on solar cells are usually fabricated using screen printing of the metal paste ...
doi:10.1155/2009/827402
fatcat:vy7iwtqj45hsxl5egnhixtpy3i
Efficient methods for finding influential locations with adaptive grids
2011
Proceedings of the 20th ACM international conference on Information and knowledge management - CIKM '11
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work and the number of clients attracted by a new server in the result location often exceeds 98% of the optimal. ...
Using our relaxed model, we design an efficient grid-based approximation algorithm called FILM (Fast Influential Location Miner) to the queries, which is orders of magnitude faster than the bestknown previous ...
FILM returns a grid cell in which each location is an influential one, as an approximation of the optimal location. ...
doi:10.1145/2063576.2063788
dblp:conf/cikm/YanWN11
fatcat:7dvr54f6ufhmndzqvvytb62ocy
Optimal multidimensional quantization for pattern recognition
2002
Second International Conference on Image and Graphics
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We illustrate the effectiveness of optimal quantization on a set of not very well separated Gaussian mixture models, as compared to the expectation maximization (EM) algorithm. ...
In non-parametric pattern recognition, the probability density function is approximated by means of many parameters, each one for a density value in a small hyper-rectangular volume of the space. ...
decision boundary of a grid is moved, we need only recalculate the change of the additive measures on those affected cells and data. ...
doi:10.1117/12.477142
fatcat:v6kyv5t6tzak7pt35oj3ljc4ly
Page 420 of Journal of Aircraft Vol. 23, Issue 5
[page]
1986
Journal of Aircraft
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The grid is essentially optimized after 20 iterations. In spite of a nearly constant smoothness, after 30 iterations one singular master cell appears at the nose tip. ...
Obviously, optimizing the grid in terms of smoothness only (a = 0) allows a much faster untangling of the initial singular grid. ...
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