361 research outputs found
Optimization of coefficients of lists of polynomials by evolutionary algorithms
We here discuss the optimization of coefficients of lists of polynomials
using evolutionary computation. The given polynomials have 5 variables,
namely t, a1, a2, a3, a4, and integer coefficients. The goal is to find integer
values i, with i 2 {1, 2, 3, 4}, substituting ai such that, after crossing out
the gcd (greatest common divisor) of all coefficients of the polynomials, the
resulting integers are minimized in absolute value. Evolution strategies, a
special class of heuristic, evolutionary algorithms, are here used for solving
this problem. In this paper we describe this approach in detail and analyze
test results achieved for two benchmark problem instances; we also show a
visual analysis of the fitness landscapes of these problem instancesThe authors thank Franz Winkler at the Research Institute
for Symbolic Computation, Johannes Kepler University Linz, for his advice.
R. Sendra is partially supported by the Spanish Ministerio de Economía y Competitividad
under the project MTM2011-25816-C02-01 and is a member of the Research
Group ASYNACS (Ref. CCEE2011/R34). The authors also thanks members of
the Heuristic and Evolutionary Algorithms Laboratory as well as of the Bioinformatics
Research Group, University of Applied Sciences Upper Austria, for their
comments
Optimization of coefficients of lists of polynomials by evolutionary algorithms
We here discuss the optimization of coefficients of lists of polynomials
using evolutionary computation. The given polynomials have 5 variables,
namely t, a1, a2, a3, a4, and integer coefficients. The goal is to find integer
values i, with i 2 {1, 2, 3, 4}, substituting ai such that, after crossing out
the gcd (greatest common divisor) of all coefficients of the polynomials, the
resulting integers are minimized in absolute value. Evolution strategies, a
special class of heuristic, evolutionary algorithms, are here used for solving
this problem. In this paper we describe this approach in detail and analyze
test results achieved for two benchmark problem instances; we also show a
visual analysis of the fitness landscapes of these problem instancesMinisterio de Ciencia e Innovació
Fitness landscape analysis in the optimization of coefficients of curve parametrizations
Este documento se considera que es una ponencia de congresos en lugar de un capítulo de libro.Computer Aided Systems Theory - EUROCAST 2017, 19-24 February, Las Palmas de Gran Canaria, Spain.J.R. Sendra is member of the Research Group ASYNACS (Ref.CT-CE2019/683)Parametric representations of geometric objects, such as curves or surfaces, may have unnecessarily huge integer coefficients. Our goal is to search for an alternative parametric representation of the same object with significantly smaller integer coefficients. We have developed and implemented an evolutionary algorithm that is able to find solutions to this problem in an efficient as well as robust way. In this paper we analyze the fitness landscapes associated with this evolutionary algorithm. We here discuss the use of three different strategies that are used to evaluate and order partial solutions. These orderings lead to different landscapes of combinations of partial solutions in which the optimal solutions are searched. We see that the choice of this ordering strategy has a huge inuence on the characteristics of the resulting landscapes, which are in this paper analyzed using a set of metrics, and also on the quality of the solutions that can be found by the subsequent evolutionary search.Ministerio de Economía y CompetitividadEuropean Regional Development FundAustrian Research Promotion Agenc
Optimization of coefficients of lists of polynomials by evolutionary algorithms
We here discuss the optimization of coefficients of lists of polynomials
using evolutionary computation. The given polynomials have 5 variables,
namely t, α1, a2, a3, a4
and integer coefficients. The goal is to find integer
, with i ∈ {1, 2, 3, 4}, substituting a
such that, after crossing out
the gcd (greatest common divisor) of all coefficients of the polynomials, the
resulting integers are minimized in absolute value. Evolution strategies, a
special class of heuristic, evolutionary algorithms, are here used for solving
this problem. In this paper we describe this approach in detail and analyze
test results achieved for two benchmark problem instances; we also show a
visual analysis of the fitness landscapes of these problem instances.
Keywords: Optimization of parametrizations, symbolic computation, evolutionary
computation, evolution strategies
Histological classification of canine and feline lymphoma using a modular approach based on deep learning and advanced image processing
Histopathological examination of tissue samples is essential for identifying tumor malignancy and the diagnosis of different types of tumor. In the case of lymphoma classification, nuclear size of the neoplastic lymphocytes is one of the key features to differentiate the different subtypes. Based on the combination of artificial intelligence and advanced image processing, we provide a workflow for the classification of lymphoma with regards to their nuclear size (small, intermediate, and large). As the baseline for our workflow testing, we use a Unet++ model trained on histological images of canine lymphoma with individually labeled nuclei. As an alternative to the Unet++, we also used a publicly available pre-trained and unmodified instance segmentation model called Stardist to demonstrate that our modular classification workflow can be combined with different types of segmentation models if they can provide proper nuclei segmentation. Subsequent to nuclear segmentation, we optimize algorithmic parameters for accurate classification of nuclear size using a newly derived reference size and final image classification based on a pathologists-derived ground truth. Our image classification module achieves a classification accuracy of up to 92% on canine lymphoma data. Compared to the accuracy ranging from 66.67 to 84% achieved using measurements provided by three individual pathologists, our algorithm provides a higher accuracy level and reproducible results. Our workflow also demonstrates a high transferability to feline lymphoma, as shown by its accuracy of up to 84.21%, even though our workflow was not optimized for feline lymphoma images. By determining the nuclear size distribution in tumor areas, our workflow can assist pathologists in subtyping lymphoma based on the nuclei size and potentially improve reproducibility. Our proposed approach is modular and comprehensible, thus allowing adaptation for specific tasks and increasing the users’ trust in computer-assisted image classification
Closing-Wedge Posterior Tibial Slope-Reducing Osteotomy in Complex Revision ACL Reconstruction
Background: A posterior tibial slope (PTS) >12° has been shown to correlate with failure of anterior cruciate ligament (ACL) reconstruction (ACLR). PTS-reducing osteotomy has been described to correct the PTS in patients with a deficient ACL, mostly after failure of primary ACLR. Purpose: To report radiologic indices, clinical outcomes, and postoperative complications after PTS-reducing osteotomy performed concurrently with revision ACLR (R-ACLR). Study design: Case series; Level of evidence, 4. Methods: A review of medical records at 3 institutions was performed of patients who had undergone PTS-reducing osteotomy concurrently with R-ACLR between August 2010 and October 2020. Radiologic parameters recorded included the PTS, patellar height according to the Caton-Deschamps Index (CDI), and anterior tibial translation (ATT). Patient-reported outcomes (International Knee Documentation Committee [IKDC] and Knee injury and Osteoarthritis Outcome Score [KOOS]), reoperations, and complications were evaluated. Results: Included were 23 patients with a mean follow-up of 26.7 months (range, 6-84 months; median, 22.5 months). Statistically significant differences from preoperative to postoperative values were found in PTS (median [range], 14.0° [12°-18°] vs 4.0° [0°-15°], respectively; P < .001), CDI (median, 1.00 vs 1.10, respectively; P = .04) and ATT (median, 8.5 vs 3.6 mm, respectively; P = .001). At the final follow-up, the IKDC score was 52.4 ± 19.2 and the KOOS subscale scores were 81.5 ± 9.5 (Pain), 74 ± 21.6 (Symptoms), 88.5 ± 8 (Activities of Daily Living); 52.5 ± 21.6 (Sport and Recreation), and 48.8 ± 15.8 (Quality of Life). A traumatic ACL graft failure occurred in 2 patients (8.7%). Reoperations were necessary for 6 patients (26.1%) because of symptomatic hardware, and atraumatic recurrent knee instability was diagnosed in 1 patient (4.3%). Conclusion: Tibial slope-reducing osteotomy resulted in a significant decrease of ATT and can be considered in patients with a preoperative PTS ≥12° and ≥1 ACLR failure. In highly complex patients with multiple prior surgeries, the authors found a reasonably low graft failure rate (8.7%) when utilizing PTS-reducing osteotomy. Surgeons must be aware of potential complications in patients with multiple previous failed ACLRs
Energetics and stability of nanostructured amorphous carbon
Monte Carlo simulations, supplemented by ab initio calculations, shed light
into the energetics and thermodynamic stability of nanostructured amorphous
carbon. The interaction of the embedded nanocrystals with the host amorphous
matrix is shown to determine in a large degree the stability and the relative
energy differences among carbon phases. Diamonds are stable structures in
matrices with sp^3 fraction over 60%. Schwarzites are stable in low-coordinated
networks. Other sp^2-bonded structures are metastable.Comment: 11 pages, 7 figure
Guiding center picture of magnetoresistance oscillations in rectangular superlattices
We calculate the magneto-resistivities of a two-dimensional electron gas
subjected to a lateral superlattice (LSL) of rectangular symmetry within the
guiding-center picture, which approximates the classical electron motion as a
rapid cyclotron motion around a slowly drifting guiding center. We explicitly
evaluate the velocity auto-correlation function along the trajectories of the
guiding centers, which are equipotentials of a magnetic-field dependent
effective LSL potential. The existence of closed equipotentials may lead to a
suppression of the commensurability oscillations, if the mean free path and the
LSL modulation potential are large enough. We present numerical and analytical
results for this suppression, which allow, in contrast to previous quantum
arguments, a classical explanation of similar suppression effects observed
experimentally on square-symmetric LSL. Furthermore, for rectangular LSLs of
lower symmetry they lead us to predict a strongly anisotropic resistance
tensor, with high- and low-resistance directions which can be interchanged by
tuning the externally applied magnetic field.Comment: 12 pages, 9 figure
A 250-year isotopic proxy rainfall record from southern Botswana
Climate records along aridity gradients where manifestations of
climate change are most profound are important for testing climate models. The
Kalahari Transect spans such a gradient, but instrumental records of climate
parameters are limited in the sparsely populated region. We analysed the δ13C
and δ18O record from a Vachellia erioloba (E.Mey) tree from the southern
Kalahari Desert in Botswana to explore its potential as a climate proxy archive.
Radiocarbon dates show that the record spans the period 1758-2013 CE.
Both the δ13C and δ18O records correlate with local rainfall. The isotope proxies
show a weak positive correlation with sea-surface temperature reconstruction
from the southwestern Indian Ocean, and a stronger correlation with the El Niño
Southern Oscillation index. This appears to contradict previous evidence that
higher sea-surface temperatures are associated with reduced summer rainfall
over the southern African interior. Instead of eastward shifts in the temperate
tropical trough synoptic system during elevated southwestern Indian Ocean
temperature anomalies, the evidence supports a westwards shift. The result
demonstrates the potential of Vachellia erioloba as a climate proxy archive that
may yield past climate variability from the arid regions of southern Africa.The National Research Foundation (NRF)
of South Africa under the Research Grant for Unrated Researchers number
CSUR13092647960. AMS radiocarbon analyses were supported by the
Romanian Ministry of Research and Innovation CNCS-UEFISCDI under grant
PN-III-P4-ID-PCE-2016-0776, Nr. 90/2017.http://chem.ubbcluj.ro/~studiachemiaam2019Mammal Research Institut
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