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Computer-aided sperm analysis： a useful tool to evaluate patient＇s response to varicocelectomy

Asian Journal of Andrology 2017年第4期19卷 449-452页

作者： Julia I Ariagno Gabriela R Mendeluk Maria J Furlan M Sardi P Chenlo Susana M Curi Mercedes N Pugliese Herberto E Repetto mariano cohen Clinical Biochemistry Department Male Fertility Laboratory Faculty of Pharmacy and Biochemetry University of Buenos Aires Argentina Urology Department "Jose de San Martin" Clinical Hospital University of Buenos Aires Buenos Aires Argentina (CP1120)

Preoperative and postoperative sperm parameter values from infertile men with varicocele were analyzed by computer-aided sperm analysis （CASA） to assess if sperm characteristics improved after varicocelectomy. Semen samples of men with proven fertility （n = 38） and men with varicocele-related infertility （n = 61） were also analyzed. Conventional semen analysis was performed according to WHO （2010） criteria and a CASA system was employed to assess kinetic parameters and sperm concentration. Seminal parameters values in the fertile group were very far above from those of the patients, either before or after surgery. No significant improvement in the percentage normal sperm morphology （P = 0. 10）, sperm concentration （P = 0.52）, total sperm count （P = 0.76）, subjective motility （%）（P = 0.97） nor kinematics （P = 0.30） was observed after varicocelectomy when all groups were compared. Neither was significant improvement found in percentage normal sperm morphology （P = 0.91）, sperm concentration （P =0. 10）, total sperm count （P = 0.89） or percentage motility （P = 0.77） after varicocelectomy in paired comparisons of preoperative and postoperative data. Analysis of paired samples revealed that the total sperm count （P = 0.01） and most sperm kinetic parameters： curvilinear velocity （P = 0.002）, straight-line velocity （P = 0.0004）, average path velocity （P = 0.0005）, linearity （P = 0.02）, and wobble （P = 0.006） improved after surgery. CASA offers the potential for accurate quantitative assessment of each patient＇s response to varicocelectomy.

关键词： computer-assisted semen analysis male infertility semen analysis varicocele varicocelectomy

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Space Deformations,Surface Deformations and the Opportunities In-Between

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Journal of Computer Science & Technology 2009年第1期24卷 2-5页

作者： Daniel cohen-Or School of Computer Science Tel-Aviv UniversityIsrael

In recent years we have witnessed a large interest in surface deformation techniques. This has been a reaction that can be attributed to the ability to develop techniques which are detail-preserving. Space deformation techniques, on the other hand, received less attention, but nevertheless they have many advantages over surface-based techniques. This paper explores the potential of these two approaches to deformation and discusses the opportunities that the fusion of the two may lead to.

关键词： space deformation mesh editing digital surfaces

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A Random Nonstationary Pulse Train Model

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Journal of Beijing Institute of Technology 2021年第3期30卷 228-237页

作者： Leon cohen Department of Physics Hunter College of the City University of New York695 Park Ave.New YorkNY 10065USA

A simple and mathematically tractable model of a nonstationary process is *** process is the sum of waves where the parameters of the waves are *** expres-sions for the mean and autocorrelation function at each position as a function of time are *** the case of infinite time,the model evolves into a stationary *** time-frequency distri-bution at each position is also *** explicit example is given where the initial waves are *** case where there is dispersion in the propagation is also discussed.

关键词： nonstationary process mean and autocorrelation function time-frequency distribution Gaussian waves

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NON SPURIOUS SPECTRAL-LIKE ELEMENT METHODS FOR MAXWELL'S EQUATIONS

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Journal of Computational Mathematics 2007年第3期25卷 282-304页

作者： Gary cohen Marc Duruflé INRIA Domaine de VoluceauRocquencourt-BP 10578153 Le Chesnay CedexFrance

In this paper, we give the state of the art for the so called “mixed spectral elements” for Maxwell＇s equations. Several families of elements, such as edge elements and discon-tinuous Galerkin methods （DGM） are presented and discussed. In particular, we show the need of introducing some numerical dissipation terms to avoid spurious modes in these methods. Such terms are classical for DGM but their use for edge element methods is novel approach described in this paper. Finally, numerical experiments show the fast and low-cost character of these elements.

关键词： Maxwell's equations Discontinuous Galerkin methods Edge elements Masslumping.

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Motion of charged particles in bright squeezed vacuum

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Light(Science & Applications) 2024年第2期13卷 347-353页

作者： Matan Even Tzur Oren cohen Solid State Institute and Physics Department Technion-Israel Institute of TechnologyHaifa3200003Israel

The motion of laser-driven electrons quivers with an average energy termed pondermotive *** explore electron dynamics driven by bright squeezed vacuum(BSV),finding that BSV induces width oscillations,akin to electron quivering in laser light,with an equivalent ponderomotive *** identify closed and open trajectories of the electronic width that are associated with high harmonic generation and above-threshold ionization,respectively,similarly to trajectories of the electron position when its motion is driven by coherent *** the case of bound electrons,the width oscillations may lead to ionization with noisy sub-cycle *** results are foundational for strong-field and free-electron quantum optics,as they shed light on ionization,high harmonic generation,and nonlinear Compton scattering in BSV.

关键词： structure vacuum ionization

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The Depletion of the Red Supergiant Envelope Radiative Zone During Common Envelope Evolution

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Research in Astronomy and Astrophysics 2023年第6期23卷 252-259页

作者： Tamar cohen Noam Soker Department of Physics TechnionHaifa3200003Israel

We conduct one-dimensional stellar evolution simulations of red supergiant(RSG)stars that mimic common envelope evolution(CEE)and find that the inner boundary of the envelope convective zone moves into the initial envelope radiative *** envelope convection practically disappears only when the RSG radius decreases by about an order of magnitude or *** implication is that one cannot split the CEE into one stage during which the companion spirals-in inside the envelope convective zone and removes it,and a second slower phase when the companion orbits the initial envelope radiative zone and a stable mass transfer takes *** best,this might take place when the orbital separation is about several solar ***,by that time other processes become *** conclude that as of yet,the commonly used alpha-formalism that is based on energy considerations is the best phenomenological formalism.

关键词： stars:massive (stars:)binaries(including multiple):close stars:mass-loss

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EXPONENTIAL INTEGRATORS FOR STOCHASTIC SCHRODINGER EQUATIONS DRIVEN BY ITO NOISE

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Journal of Computational Mathematics 2018年第2期36卷 276-309页

作者： Rikard Anton David cohen Department of Mathematics and Mathematical Statistics Umea University SE-901 87 Umea Sweden Department of Mathematics University of Innsbruck A 6020 Innsbruck Austria

We study an explicit exponential scheme for the time discretisation of stochastic SchrS- dinger Equations Driven by additive or Multiplicative It6 Noise. The numerical scheme is shown to converge with strong order 1 if the noise is additive and with strong order 1/2 for multiplicative noise. In addition, if the noise is additive, we show that the exact solutions of the linear stochastic Sehr6dinger equations satisfy trace formulas for the expected mass, energy, and momentum （i. e., linear drifts in these quantities）. Furthermore, we inspect the behaviour of the numerical solutions with respect to these trace formulas. Several numerical simulations are presented and confirm our theoretical results.

关键词： Stochastic partial differential equations Stochastic SchrSdinger equations,Numerical methods Geometric numerical integration Stochastic exponential integrators,Strong convergence Trace formulas.

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Image resizing by reconstruction from deep features

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Computational Visual Media 2021年第4期7卷 453-466页

作者： Dov Danon Moab Arar Daniel cohen-Or Ariel Shamir Tel Aviv University Tel Aviv69978Israel The Interdisciplinary Center Herzliya Herzliya4610101

Traditional image resizing methods usually work in pixel space and use various saliency *** challenge is to adjust the image shape while trying to preserve important *** this paper we perform image resizing in feature space using the deep layers of a neural network containing rich important semantic *** directly adjust the image feature maps,extracted from a pre-trained classification network,and reconstruct the resized image using neuralnetwork based *** novel approach leverages the hierarchical encoding of the network,and in particular,the high-level discriminative power of its deeper layers,that can recognize semantic regions and objects,thereby allowing maintenance of their aspect *** use of reconstruction from deep features results in less noticeable artifacts than use of imagespace resizing *** evaluate our method on benchmarks,compare it to alternative approaches,and demonstrate its strengths on challenging images.

关键词： image retargeting reconstruction deep seam carving image resizing

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Paclitaxel-associated reticulate hyperpigmentation:Report and review of chemotherapy-induced reticulate hyperpigmentation

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World Journal of Clinical Cases 2016年第12期4卷 390-400页

作者： Philip R cohen Department of Dermatology University of California San Diego

Drug-induced reticulate hyperpigmentation is uncommon. Including the patient described in this report, chemotherapy-associated reticulate hyperpigmentation has only been described in ten individuals. This paper describes the features of a woman with recurrent and metastatic breast cancer who developed paclitaxelinduced reticulate hyperpigmentation and reviews the characteristics of other oncology patients who developed reticulate hyperpigmentation from their antineoplastic treatment. A 55-year-old Taiwan Residents woman who developed reticulate hyperpigmentation on her abdomen, back and extremities after receiving her initial treatment for metastatic breast cancer with paclitaxel is described. The hyperpigmentation became darker with each subsequent administration of paclitaxel. The drug was discontinued after five courses and the pigment faded within two months. Pub Med was searched with the key words: Breast, cancer, chemotherapy, hyperpigmentation, neoplasm, reticulate, tumor, paclitaxel, taxol. The papers generated by the search, and their references, were reviewed. Chemotherapy-induced reticulate hyperpigmentation has been described in four men and six women. Bleomycin, cytoxan, 5-fluorouracil, idarubacin, and paclitaxel caused the hyperpigmentation. The hyperpigmentation faded in 83% of the patients between two to six months after the associated antineoplastic agent was discontinued. In conclusion, chemotherapy-induced reticulate hyperpigmentation is a rare reaction that may occur during treatment with various antineoplastic agents. The hyperpigmentation fades in most individuals once thetreatment is discontinued. Therefore, cancer treatment with the associated drug can be continued in patients who experience this cutaneous adverse event.

关键词： Breast Cancer Chemotherapy Hyperpigmentation Neoplasm Reticulate Tumor Paclitaxel Taxol

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Dance to the beat： Synchronizing motion to audio

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Computational Visual Media 2018年第3期4卷 197-208页

作者： Rachele Bellini Yanir Kleimani Daniel cohen-Or Tel Aviv University Tel Aviv 6997801 Israel.

In this paper we introduce a video post-processing method that enhances the rhythm of a dancing performance,in the sense that the dancing movements are more in time to the beat of the *** dancing performance as observed in a video is analyzed and segmented into motion intervals delimited by motion *** present an image-space method to extract the motion beats of a video by detecting frames at which there is a significant change in direction or motion *** motion beats are then synchronized with the music beats such that as many beats as possible are matched with as little as possible time-warping distortion to the *** show two applications for this cross-media synchronization:one where a given dance performance is enhanced to be better synchronized with its original music,and one where a given dance video is automatically adapted to be synchronized with different music.

关键词： video processing synchronization motionsegmentation video analysis

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