scholarly journals A sparse iteration space transformation framework for sparse tensor algebra

2020 ◽  
Vol 4 (OOPSLA) ◽  
pp. 1-30 ◽  
Author(s):  
Ryan Senanayake ◽  
Changwan Hong ◽  
Ziheng Wang ◽  
Amalee Wilson ◽  
Stephen Chou ◽  
...  
Keyword(s):  
Tensor Algebra ◽  
Iteration Space ◽  
Space Transformation

A layout-conscious iteration space transformation technique

2001 ◽  
Vol 50 (12) ◽  
pp. 1321-1335 ◽  
Author(s):  
M. Kandemir ◽  
J. Ramanujam ◽  
A. Choudhary ◽  
P. Banerjee
Keyword(s):  
Transformation Technique ◽  
Iteration Space ◽  
Space Transformation

Color Space Transformation using Neural Networks

2019 ◽  
Vol 2019 (1) ◽  
pp. 153-158
Author(s):  
Lindsay MacDonald
Keyword(s):  
Neural Network ◽  
Neural Networks ◽  
Color Space ◽  
Reflectance Spectra ◽  
Network Architectures ◽  
Color Spaces ◽  
Natural Materials ◽  
Space Transformation ◽  
Color Space Transformation

We investigated how well a multilayer neural network could implement the mapping between two trichromatic color spaces, specifically from camera R,G,B to tristimulus X,Y,Z. For training the network, a set of 800,000 synthetic reflectance spectra was generated. For testing the network, a set of 8,714 real reflectance spectra was collated from instrumental measurements on textiles, paints and natural materials. Various network architectures were tested, with both linear and sigmoidal activations. Results show that over 85% of all test samples had color errors of less than 1.0 ΔE2000 units, much more accurate than could be achieved by regression.

A Correspondence-Free Color Chart Design for Color Calibration

2020 ◽  
Vol 2020 (1) ◽  
pp. 100-104
Author(s):  
Hakki Can Karaimer ◽  
Rang Nguyen
Keyword(s):  
Color Space ◽  
Fixed Number ◽  
New Approach ◽  
Color Chart ◽  
Color Calibration ◽  
Space Transformation ◽  
Color Space Transformation ◽  
Chart Design ◽  
Calibration Approach

Colorimetric calibration computes the necessary color space transformation to map a camera's device-specific color space to a device-independent perceptual color space. Color calibration is most commonly performed by imaging a color rendition chart with a fixed number of color patches with known colorimetric values (e. g., CIE XYZ values). The color space transformation is estimated based on the correspondences between the camera's image and the chart's colors. We present a new approach to colorimetric calibration that does not require explicit color correspondences. Our approach computes a color space transformation by aligning the color distributions of the captured image to the known distribution of a calibration chart containing thousands of colors. We show that a histogram-based colorimetric calibration approach provides results that are onpar with the traditional patch-based method without the need to establish correspondences.

Inventing Synagogue Conversion

2013 ◽  
Vol 4 (3) ◽  
pp. 401-416
Author(s):  
Shira L. Lander
Keyword(s):  
Religious Belief ◽  
Sacred Space ◽  
Sixth Century ◽  
Building Structures ◽  
Late Antique ◽  
Complex Processes ◽  
Space Transformation

Historians of the ancient synagogue often use the term “conversion” to describe any kind of adaptation of a building once designated as a synagogue into a church. This label oversimplifies and misconstrues complex processes, both rhetorical and architectural, that were at work in transforming the landscape of the late antique Mediterranean. I explore the dynamic of this triumphalist rhetoric and architectural strategy, showing that Christian writers meant something very specific by the term “conversion,” and that they invented the paradigm of synagogue conversion in order to interpret the changing landscape to their readers. The architectural program of replacement as a strategy for converting subject populations to Christianity emerged in the sixth century. By characterizing changes made to building structures and changes in religious belief as “conversion,” imperial policy concretized the association of sacred space transformation with the victory of Christianity over Judaism and paganism.

scholarly journals CONSTRUCTIVE NONCOMMMUTATIVE INVARIANT THEORY

2021 ◽  
Author(s):  
MÁTYÁS DOMOKOS ◽  
VESSELIN DRENSKY
Keyword(s):  
Lie Algebra ◽  
Associative Algebra ◽  
Invariant Theory ◽  
Reductive Group ◽  
Symmetric Tensor ◽  
Free Associative Algebra ◽  
Tensor Algebra ◽  
Enveloping Algebra ◽  
Finite Dimensional ◽  
Degree Bounds

AbstractThe problem of finding generators of the subalgebra of invariants under the action of a group of automorphisms of a finite-dimensional Lie algebra on its universal enveloping algebra is reduced to finding homogeneous generators of the same group acting on the symmetric tensor algebra of the Lie algebra. This process is applied to prove a constructive Hilbert–Nagata Theorem (including degree bounds) for the algebra of invariants in a Lie nilpotent relatively free associative algebra endowed with an action induced by a representation of a reductive group.

scholarly journals Analytical Model of Induction Machines with Multiple Cage Faults Using the Winding Tensor Approach

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5076
Author(s):  
Javier Martinez-Roman ◽  
Ruben Puche-Panadero ◽  
Angel Sapena-Bano ◽  
Carla Terron-Santiago ◽  
Jordi Burriel-Valencia ◽  
...  
Keyword(s):  
Computational Cost ◽  
Induction Machines ◽  
Diagnostic Techniques ◽  
Analytical Models ◽  
Tensor Algebra ◽  
Diagnostic Systems ◽  
Technical Literature ◽  
Twin Model ◽  
Ring Segment ◽  
The One

Induction machines (IMs) are one of the main sources of mechanical power in many industrial processes, especially squirrel cage IMs (SCIMs), due to their robustness and reliability. Their sudden stoppage due to undetected faults may cause costly production breakdowns. One of the most frequent types of faults are cage faults (bar and end ring segment breakages), especially in motors that directly drive high-inertia loads (such as fans), in motors with frequent starts and stops, and in case of poorly manufactured cage windings. A continuous monitoring of IMs is needed to reduce this risk, integrated in plant-wide condition based maintenance (CBM) systems. Diverse diagnostic techniques have been proposed in the technical literature, either data-based, detecting fault-characteristic perturbations in the data collected from the IM, and model-based, observing the differences between the data collected from the actual IM and from its digital twin model. In both cases, fast and accurate IM models are needed to develop and optimize the fault diagnosis techniques. On the one hand, the finite elements approach can provide highly accurate models, but its computational cost and processing requirements are very high to be used in on-line fault diagnostic systems. On the other hand, analytical models can be much faster, but they can be very complex in case of highly asymmetrical machines, such as IMs with multiple cage faults. In this work, a new method is proposed for the analytical modelling of IMs with asymmetrical cage windings using a tensor based approach, which greatly reduces this complexity by applying routine tensor algebra to obtain the parameters of the faulty IM model from the healthy one. This winding tensor approach is explained theoretically and validated with the diagnosis of a commercial IM with multiple cage faults.

scholarly journals The role of employment in the development of Czech rural areas

2012 ◽  
Vol 50 (No. 10) ◽  
pp. 465-470
Author(s):  
G. Pavlíková ◽  
P. Maříková
Keyword(s):  
Rural Communities ◽  
National Economy ◽  
Rural Areas ◽  
Small And Medium Enterprises ◽  
Small Enterprise ◽  
Legal Form ◽  
Space Transformation ◽  
Medium Enterprises ◽  
In The Beginning ◽  
And Function

The rural area is a very important multifunctional space, with landscape enhancement value and function. These factors are then necessary for the directions of development process in rural communities. The countryside creates an important part of economic and social state system. The area of work and the employment of population into the productive age present ones of significant macro-economic indicators of the capacity of national economy. Changes of economy in the market space, transformation of companies of agricultural primary production to new legal form, restructuring of production and manpower in agriculture  caused leaving of part skilled of the workers, as well as other workers to another branches of national economy. In 1990’s, especially in the beginning during the transformation of Czech economy, there was a big boom of private business and new forms of business activities and subjects emerged. Traditional lifestyle, which continues in the Czech countryside, determined that small enterprise prevails here. Current economics clearly shows that small and medium enterprises have an unsubstitutable role in our economic development and greatly contribute to creating new jobs in individual regions.

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