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Unsupervised natural image patch learning

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Computational Visual Media 2019年第3期5卷 229-237页

作者： Dov Danon Hadar Averbuch-Elor ohad Fried Daniel Cohen-Or Tel-Aviv University Tel Aviv 6997801Israel Stanford University StanfordCA 94305USA

A metric for natural image patches is an important tool for analyzing images. An efficient means of learning one is to train a deep network to map an image patch to a vector space, in which the Euclidean distance reflects patch similarity. Previous attempts learned such an embedding in a supervised manner,requiring the availability of many annotated images. In this paper, we present an unsupervised embedding of natural image patches, avoiding the need for annotated images. The key idea is that the similarity of two patches can be learned from the prevalence of their spatial proximity in natural images. Clearly, relying on this simple principle, many spatially nearby pairs are outliers. However, as we show, these outliers do not harm the convergence of the metric learning. We show that our unsupervised embedding approach is more effective than a supervised one or one that uses deep patch representations. Moreover, we show that it naturally lends itself to an efficient self-supervised domain adaptation technique onto a target domain that contains a common foreground object.

关键词： unsupervised learning metric learning

Incidence of colorectal neoplasms among male pilots

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World Journal of Gastroenterology 2014年第27期20卷 9116-9120页

作者： Menachem Moshkowitz ohad Toledano Lior Galazan Aharon Hallak Nadir Arber Erwin Santo Integrated Cancer Prevention Center and Department of Gastroenterology Tel-Aviv Sourasky Medical Center and Sackler Faculty of Medicine Tel-Aviv University

AIM: To assess the prevalence of colorectal neoplasms (adenomas, advanced adenomas and colorectal cancers) among Israeli military and commercial airline pilots.

关键词： Colorectal cancer Adenomatous polyps Colon neoplasms Hyperplastic polyps

AFLOW-XtalFinder:a reliable choice to identify crystalline prototypes

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npj Computational Materials 2021年第1期7卷 264-283页

作者： David Hicks Cormac Toher Denise CFord Frisco Rose Carlo De Santo ohad Levy Michael J.Mehl Stefano Curtarolo Department of Mechanical Engineering and Materials Science Duke UniversityDurhamNC 27708USA Center for Autonomous Materials Design Duke UniversityDurhamNC 27708USA Department of Physics NRCNP.O.Box 9001Beer-Sheva 84190Israel

The accelerated growth rate of repository entries in crystallographic databases makes it arduous to identify and classify their prototype *** open-source AFLOW-XtalFinder package was developed to solve this *** symbolically maps structures into standard designations following the AFLOW Prototype Encyclopedia and calculates the internal degrees of freedom consistent with the International Tables for *** ensure uniqueness,structures are analyzed and compared via symmetry,local atomic geometries,and crystal mapping techniques,simultaneously grouping them by *** software(i)distinguishes distinct crystal prototypes and atom decorations,(ii)determines equivalent spin configurations,(iii)reveals compounds with similar properties,and(iv)guides the discovery of unexplored *** operations are accessible through a Python module ready for workflows,and through command line *** the 4+million compounds in the *** repositories are mapped to their ideal prototype,allowing users to search database entries via symbolic ***,15,000 unique structures—sorted by prevalence—are extracted from the AFLOW-ICSD catalog to serve as future prototypes in the Encyclopedia.

关键词： Python symbolic crystalline

Spatially resolved measurement of plasmon dispersion using Fourier-plane spectral imaging

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Photonics Research 2018年第6期6卷 653-658页

作者： AMIR ohad KATHERINE AKULOV ERAN GRANOT URI ROSSMAN FERNANDO PATOLSKY TAL SCHWARTZ School of Physics Raymond and Beverly Sackler Faculty of Exact SciencesTel Aviv University Center for Light-Matter Interaction Tel Aviv University School of Chemistry Raymond and Beverly Sackler Faculty of Exact SciencesTel Aviv University

We show that Fourier-plane imaging in conjunction with the Kretschmann–Raether configuration can be used for measuring polariton dispersion with spatial discrimination of the sample, over the whole visible spectral *** demonstrate the functionality of our design on several architectures, including plasmonic waveguides, and show that our new design enables the measurement of plasmonic dispersion curves of spatially inhomogeneous structures with features as small as 3 μm, in a single shot.

关键词： Surface plasmons Microscopy Waveguides Dispersion Spectroscopy surface Thin films optical properties

Growth of the Earthworm Millsonia omodeoi and Its Capacity to Accumulate Five Heavy Metals (HM) in Soils along a Toll Highway in Côte d’Ivoire

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Open Journal of Soil Science 2024年第1期14卷 115-132页

作者： Mamadou Toure Kpan Kouakou Gains Kpan N’guetta Moïse Ehouman Seydou Tiho Laboratory of Ecology and Sustainable Development (LEDD) Department of Natural Sciences (UFR SN) University Nangui ABROGOUA Abidjan C&#244te d’Ivoire

The roads in correlation with the traffic linked to their existences are at the origin of the emission of numerous polluting substances likely to induce disturbances of the growth and the behavioral changes in the organisms living in their vicinities. The purpose of this study is to analyze the growth and capacity accumulation of a common earthworm species (Millsonia omodeoi) in Cu, Cr, Ni, Pb and Zn in soils along a main road called “Autoroute du Nord” in C?te d’Ivoire. Thus, the earthworms were harvested in soils from a distance of 0 m (just after the sidewalk) to a distance of 200 m from the toll highway and in a control soil sampled in Lamto reserve (C?te d’Ivoire). The study was carried out in the soil laboratory at the ecological station of Lamto reserve. The Ford-Walford technique was used to determine the model and parameters most appropriated for describing the growth of earthworms. A pairwise comparison of the growth parameters was carried out using the Kruskal-Wallis test with the STATISTICA 7.1 software. The heavy metals contained in the cultivated soils and earthworms were detected and quantified using a Scanning Electron Micro-scope (MEB FEG Supra 40 VP Zeiss) and an Atomic Absorption Spectrometer SPECTRA 110 (VARIAN). The capacity accumulation of heavy metals in earthworm was determined by the bioaccumulation factor (BAF) calculation. The results of this study showed that Gompertz is the most appropriated model to describe the growth of M. omodeoi. The life cycle of M. omodeoi shows that this earthworm adopts a K type demographic strategy. Cu is the most accumulated heavy metals in M. omodeoi, when Cr is the least accumulated. Concerning heavy metal content in the earthworms, it decreases while moving away from the pavement. These results highlight a possibility of choice of M. omodeoi as 1) indicators of heavy metals pollution and 2) target of biological organisms for environmental impact studies.

关键词： M. omodeoi Bioaccumulation Heavy Metals “Autoroute du Nord” Côte d’Ivoire

Developing an Evolutionary Algorithm to Search for an Optimal Multi-Mother Wavelet Packets Combination

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Journal of Biomedical Science and Engineering 2015年第7期8卷 458-470页

作者： ohad Bar Siman Tov J. David Schaffer Kenneth J. McLeod Department of Electrical and Computer Engineering State University of New York at Binghamton Binghamton NY USA Department of Bioengineering State University of New York at Binghamton Binghamton NY USA

The wavelet transform is a popular analysis tool for non-stationary data, but in many cases, the choice of the mother wavelet and basis set remains uncertain, particularly when dealing with physiological data. Furthermore, the possibility exists for combining information from numerous mother wavelets so as to exploit different features from the data. However, the combinatorics become daunting given the large number of basis sets that can be utilized. Recent work in evolutionary computation has produced a subset selection genetic algorithm specifically aimed at the discovery of small, high-performance, subsets from among a large pool of candidates. Our aim was to apply this algorithm to the task of locating subsets of packets from multiple mother wavelet decompositions to estimate cardiac output from chest wall motions while avoiding the computational cost of full signal reconstruction. We present experiments which show how a continuous assessment metric can be extracted from the wavelets coefficients, but the dual-objective nature of the algorithm (high accuracy with small feature sets) imposes a need to restrict the sensitivity of the continuous accuracy metric in order to achieve the small subset size desired. A possibly subtle tradeoff seems to be needed to meet the dual objectives.

关键词： Wavelet Transform Data Mining Genetic Algorithm

Production of Yam Tubers Using Seed Tubers from Vitroplants Regenerated from Aerial Stems in the Yam Species Dioscorea alata (L.) and Dioscorea cayenensis-rotundata (L. & P.) in Côte d’Ivoire

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Advances in Bioscience and Biotechnology 2024年第3期15卷 184-194页

作者： Koffi Honoré Kouamé Kouakou Marius Konan Kouadio Ignace Kouassi Kouablan Edmond Koffi Assanvo Simon-Pierre N’guetta Department of des Science and Technology University Alassane Ouattara of Bouaké Bouaké C&#244te d’Ivoire Plant Production Research Unit Department of Natural Sciences University Nangui Abrogoua Abidjan C&#244te d’Ivoire Central Biotechnology Laboratory National Center for Agronomic Research (NCAR) Abidjan C&#244te d’Ivoire Genetics Laboratory of Bioscience Research Unit University Félix Houphou&#235t Boigny (UFHB) Abidjan C&#244te d’Ivoire

The aim of this study is to produce large quantities of yam tubers in the field from seed tubers derived from vitroplants regenerated from aerial stem cuttings and farmers’ tuber seeds. Seed tubers from ten yam cultivars, including five from Dioscorea alata (cDa083, cDa053, cDa115, cDa150 and cDa266) and five from Dioscorea cayenensis-rotundata (cDr015, cDr027, cDr150, cDr206 and cDr148) with distinct agro-morphological characteristics, were used as material. A completely randomized block design with 3 replications was used. In each block, all cultivars and seed types were represented. When put into cultivation, the tubers produced by the vitroplants all germinated and gave 100% healthy plants, compared with 86% to 100% healthy plants for the seed tubers produced by the farmers. Yields per hectare ranged from 10 to 25 tonnes for seed tubers produced by in vitro plants, and from 4 to 9 tons for seed tubers produced by farmers. Seed tubers from vitroplants can therefore be recommended to farmers as a solution to the problem of seed tuber unavailability.

关键词： Yams Vitroplants Seed Tubers Yields

Molecular Characterization and Prevalence of Trypanosoma Species in Cattle from a Northern Livestock Area in Cote d’Ivoire

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Open Journal of Veterinary Medicine 2014年第12期4卷 314-321页

作者： Isidore Kpandji Kouadio Didier Sokouri Mathurin Koffi Ibrahim Konate Bernadin Ahouty Alain Koffi Simon Pierre N’guetta Laboratoire de Genetique UFR BiosciencesUniversite Felix Houphouet BoignyAbidjanCote d’Ivoire Laboratoire des Interaction Hote-Microorganisme-Environnement et Evolution Universite Jean Lorougnon GuedeDaloaCote d’Ivoire Centre Suisse de Recherches Scientifiques en Cote d’Ivoire AbidjanCote d’Ivoire Institut Pierre Richet Unite de Recherche TrypanosomosesBouakeCote d’Ivoire

Background: African animal trypanosomiasis (AAT) is caused mainly by Trypanosoma congolense, T. vivax, and T. brucei brucei and is the major constraint for livestock productivity in Sub-Saharan African countries. Information about animal trypanosomiasis status in Ivory Coast is missing, especially regarding molecular epidemiology. Therefore, this study intended to apply molecular tools to identify and characterize trypanosomes in Ivory Coast for sustainable control. Methods: 363 cattle blood samples were collected from Ferkessedougou Region in northern Ivory Coast in 2012. Buffy coat technique (BCT) and species-specific PCR assays were used to detect trypanosome species. Results: Out of 363 cattle examined with BCT, 33 were found positive with all trypanosomes species accounting for an average of 9.09% prevalence whereas polymerase chain reaction (PCR) using species-specific primers showed that 81 out of 363 cattle were infected with trypanosomes with an overall prevalence of 22.31%. Trypanosoma congolense savanah type, T. Vivax and T. brucei sl. accounted for 28.39%, 49.38% and 23.45% of the infection rate respectively. No infection with T. congo forest?type was detected. T. vivax infection was the most prevalence in the area investigated compared to the two other trypanosome species. Mixed infections with different trypanosomes species were detected accounting for 7.32% of prevalence. Regarding sexrelated prevalence, male cattles were slightly more infected than female but the difference was not significant. Conclusion: Our results showed that there was a high prevalence of AAT in livestock in Ferkessedougou Area. There is therefore a need to strengthen control policies and institute measures that help prevent the spread of the parasites for sustainable control of animal trypanosome in this area.

关键词： Animal African Trypanosomiasis Molecular Diagnosis Species-Specific PCR Cote d’Ivoire

Treatment of Hip Trochanteric Bursitis Using Hyaluronate Injections

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Open Journal of Rheumatology and Autoimmune Diseases 2013年第2期3卷 125-129页

作者： Lauren Gorelick Ayala Rozano-Gorelick Dror Robinson ohad Marcus Samia Joubran Edward Ram Department of Hand Surgery Rambam Medical Center Haifa Israel Department of Psychology Tel-Hai Academic College Tel-Hai Israel Division of General Surgery Rabin Medical Center—Campus Golda Sackler School of Medicine Tel Aviv University Tel Aviv Israel Head Orthopedic Research Unit and Foot and Ankle Service Hasharon Hospital Rabin Medical Center Affiliated with Sackler Faculty of Medicine Tel Aviv University Petah Tikwa Israel The Bruce Rappaport Faculty of Medicine Techion—Israel Institute of Technology and Emek Medical Center Haifa Israel

Trochanteric bursitis is a common cause of musculoskeletal pain and often requires medical intervention and should be distinguished from sciatica and irradiating pain of pelvic and spinal origin. Previously, the etiology of the trochanteric pain syndrome was thought to be caused by inflammation. The current study was performed in order to assess the efficacy of trochanteric injections. Methods: 158 patients were treated for trochanteric bursitis (132 females/26 males, range 22 - 88 years). 59b were treated with corticosteroid injection, 60 with hyaluronate and 39 were injected using a combination of both. Patients were followed by the HOOS score for a minimum of 12 months. Results: Pre-operative HOOS scores were similar in all groups. Following injection, the HOOS score increased from 27 ± 4 to 66 ± 2 after six months and 77 ± 4 after a year. At 12-month follow-up, the average score of patients treated by corticosteroids injection was 44 ± 7 compared with 62 ± 8 for the hyaluronate injected group and 64 ± 6 for the combination injection group. Discussion: It appears that injection therapy is highly efficacious for treating trochanteric bursitis. The effect of hyaluronate or hyaluronate and steroid combination appears to be longer lasting than that of steroid alone.

关键词： Hip Trochanteric Bursitis Hyaluronic Acid Bursitis