Results 251 to 260 of about 252,160 (293)

Multi-hyperbolic tangent fuzzy c-means algorithm with spatial information for MRI segmentation

International Journal of Signal and Imaging Systems Engineering, 2016
This paper proposes a novel image segmentation using Multi-Hyperbolic Tangent Fuzzy C-Means (HTFCM) algorithm, with spatial information for medical image segmentation. The proposed method uses two hyperbolic tangent functions with the spatial information of neighbouring pixels for clustering of images.
Nookala Venu, B. Anuradha
openaire   +1 more source

Heat flow with tangent penalisation converging to mean curvature motion

Proceedings of the Royal Society of Edinburgh: Section A Mathematics, 1998
In this paper, we prove that mean curvature motion can be regarded as the singular limit of the following model:where ε > 0 is a small parameter and . This model is related to the Landau–Lifshitz equation of ferromagnetism. Local existence of classical solutions of the Dirichlet problem and global existence of the travelling wave solutions are also ...
openaire   +2 more sources

Mean-field homogenization of elasto-viscoplastic composites based on a new mapping-tangent linearization approach

Science China Technological Sciences, 2019
In this work, a new homogenization method of elasto-viscoplastic composites is developed. Using the fully implicit backward Euler’s integration algorithm, the nonlinear ordinary differential equations in the constitutive laws of the matrix and inclusion phases are discretized.
Chao Yu, GuoZheng Kang, DaiNing Fang
openaire   +1 more source

Semi-supervised OTSU based hyperbolic tangent Gaussian kernel fuzzy C-mean clustering for dental radiographs segmentation

Multimedia Tools and Applications, 2019
Dental periapical X-ray image (DXRI) segmentation is an important process to examine dental images towards diagnosing medical systems is an essential operation within practical dentistry for periodontitis recognition. However, traditional clustering algorithms in image processing frequently accept deficiencies in finding teeth sample boundaries and ...
Anuj Kumar, H. S. Bhadauria, Annapurna Singh   +2 more
openaire   +1 more source

Frequency dispersion investigation of output reactance and capacitance in GaAs MESFETs by means of dielectric loss tangent consideration

Journal of Semiconductors, 2016
The aim of this article is to investigate the effect of dielectric loss tangent on frequency dispersion of output reactance and capacitance in GaAs MESFETs. For this purpose, measurements of output impedance modulus and phase have been carried out within a frequency range of 10 Hz to 10 kHz, and various voltage values of gate-source (V gs = 0, −0.2, −0.
D Nebti, Z Hadjoub, A Guerraoui, F Z Khelifati, A Doghmane   +4 more
openaire   +1 more source

Integration of hyperbolic tangent and Gaussian kernels for Fuzzy C-means algorithm with spatial information for MRI segmentation

2013 Fifth International Conference on Advanced Computing (ICoAC), 2013
In this paper, a new segmentation algorithm by integrating the hyperbolic tangent and Gaussian kernels for fuzzy c-means (HGFCM) algorithm with spatial information is proposed for medical image segmentation. The proposed method uses the combined kernels of hyperbolic tangent function and Gaussian kernel with the spatial information of neighboring ...
Nookala Venu, B. Anuradha
openaire   +1 more source

Comments on "Measurement of Microwave Loss Tangent by Means of Microwave Resonator Bridge" [Letters]

IEEE Transactions on Microwave Theory and Techniques, 1978
In the above paper, Kneppo and Weis claim that the microwave resonator bridge (MRB) is a new and highly sensitive method for measuring dielectric losses of materials. Contrary to their belief, the principles of measurement are not new but have already been reported in [1] and [2].
openaire   +1 more source

Characterization of standard embeddings between complex Grassmannians by means of varieties of minimal rational tangents

Science in China Series A: Mathematics, 2008
Motivated by the relations between function theory on bounded symmetric domains and the geometric theory of Fano manifolds, the author gives a new proof of a theorem of Tsai in the case of irreducible symmetric domains of type I. This theorem states that a proper holomorphic map between an irreducible bounded symmetric domain of rank \(r>1\) and ...
openaire   +3 more sources

Geometrical-mechanical artefacts mediating tangent meaning: the Tangentograph

2012
This work deals with the didactical use of geometrical-mechanical artefacts to acquire tangent concept in vygotskian perspective. We adopt Rabardel’s theory on instru-mental approach to distinguish artefacts and instruments specially to evince the history-to-education ontogenesis-phylogenesis process.
DI PAOLA, Benedetto, MILICI, Pietro
openaire   +3 more sources

Dynamic Geometry Software And Tracing Tangents In The Context Of The Mean Value Theorem: Technique And Theory Production

International Journal for Technology in Mathematics Education, 2017
Based on the theoretical elements of the instrumental approach to tool use known as Task-Technique-Theory (Artigue, 2002), this paper analyses and discusses the performance of graduate students enrolled in a Teacher Training program. The latter performance relates to tracing tangent lines to the curve of a quadratic function in Dynamic ...
Cesar Martínez-Hernández, Ricardo Ulloa-Azpeitia   +1 more
openaire   +1 more source