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A Multi-Task Deep Learning Framework for Simultaneous Detection of Thoracic Pathology through Image Classification

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Journal of Computer and Communications 2024年第4期12卷 153-170页

作者： Nada Al Zahrani ramdane Hedjar Mohamed Mekhtiche Mohamed Bencherif Taha Al Fakih Fattoh Al-Qershi Muna Alrazghan Department of Computer Engineering College of Computer and Information Sciences King Saud University Riyadh Saudi Arabia Department of Information System College of Computer and Information Sciences King Saud University Riyadh Saudi Arabia Department of Software Engineering College of Computer and Information Sciences King Saud University Riyadh Saudi Arabia

Thoracic diseases pose significant risks to an individual's chest health and are among the most perilous medical diseases. They can impact either one or both lungs, which leads to a severe impairment of a person’s ability to breathe normally. Some notable examples of such diseases encompass pneumonia, lung cancer, coronavirus disease 2019 (COVID-19), tuberculosis, and chronic obstructive pulmonary disease (COPD). Consequently, early and precise detection of these diseases is paramount during the diagnostic process. Traditionally, the primary methods employed for the detection involve the use of X-ray imaging or computed tomography (CT) scans. Nevertheless, due to the scarcity of proficient radiologists and the inherent similarities between these diseases, the accuracy of detection can be compromised, leading to imprecise or erroneous results. To address this challenge, scientists have turned to computer-based solutions, aiming for swift and accurate diagnoses. The primary objective of this study is to develop two machine learning models, utilizing single-task and multi-task learning frameworks, to enhance classification accuracy. Within the multi-task learning architecture, two principal approaches exist soft parameter sharing and hard parameter sharing. Consequently, this research adopts a multi-task deep learning approach that leverages CNNs to achieve improved classification performance for the specified tasks. These tasks, focusing on pneumonia and COVID-19, are processed and learned simultaneously within a multi-task model. To assess the effectiveness of the trained model, it is rigorously validated using three different real-world datasets for training and testing.

关键词： Pneumonia Thoracic Pathology COVID-19 Deep Learning Multi-Task Learning

Evaluation of adsorption capacities of humic acids extracted from Algerian soil on polyaniline for application to remove pollutants such as Cd(Ⅱ), Zn(Ⅱ) and Ni(Ⅱ) and characterization with cavity microelectrode

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Journal of Environmental Sciences 2011年第7期23卷 1095-1103页

作者： Achour Terbouche Chafia Ait ramdane-Terbouche Didier Hauchard Safia Djebbar Center of Scientific Research and Technical in Physical and Chemical Analysis Laboratory of Hydrometallurgy and Molecular Inorganic Chemistry Faculty of Chemistry University of Sciences and Technology Houari Boumediene Sciences Chimiques de Rennes UMR CNRS 6226 Ecole Nationale Supe'rieure de Chimie de Rennes avenue du ge'ne'ral Leclerc Universite' Europe'enne de Bretagne 12 Avenue Janvier 35000 Rennes France

The adsorption capacities of new humic acids isolated from Yakouren forest （YHA） and Sahara （Tamenrasset： THA） soils （Algeria） and commercial humic acid （PFHA） on polyaniline emeraldine base （PEB） were studied at pH 6.6. Also the adsorption of heavy metals such as Cd 2＋ , Zn 2＋ and Ni 2＋ on humic acid-polyaniline systems （HA-PEB） was investigated at the same conditions. HA-PEB compounds were characterized by scanning electron microscopy （SEM）, infrared spectrometry and cavity microelectrode. In addition, batch adsorption and cavity microelectrode were used in the adsorption study of Cd 2＋ , Zn 2＋ and Ni 2＋ on HA-PEB. To develop biocaptors of polluting metals using a cavity microelectrode modified by HA-PEB systems, the adsorption kinetic and adsorption capacity were investigated. The SEM analysis showed that the presence of humic acid affected the PEB surface and caused the formation of a granular morphology. The maximum adsorption capacities （q max ） of PFHA, THA and YHA determined by adsorption isotherms were 91.31, 132.1 and 151.0 mg/g, respectively. Batch adsorption results showed that q max of Cd 2＋ , Zn 2＋ and Ni 2＋ on HA-PEB followed the order： THA-PEB YHA-PEB PFHA-PEB. The voltammograms obtained with HA-PEB modified cavity microelectrode showed the appearance of new redox couples reflecting the adsorption of HA on PEB. Metal-humic acid-polyaniline voltammograms were characterized by appearance of oxidation-reduction couples or reduction wave corresponding to metal. Finally, the result may be exploited to develop a biocaptor based on the cavity microelectrode amended by THA-PEB and YHA-PEB.

关键词： adsorption capacity forest and Sahara humic acids polyaniline heavy metal modified cavity microelectrode.

Bilateral versus unilateral cryptorchidism in nonobstructive azoospermia:testicular sperm extraction outcomes

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Asian Journal of Andrology 2019年第5期21卷 445-451页

作者： Anne-Laure Barbotin Anais Dauvergne Agathe Dumont Nassima ramdane Valerie Mitchell Jean-Marc Rigot Florence Boitrelle Geoffroy Robin CHU Lille Reproductive Biology-Spermiology-CECOS InstituteJeanne de Fla nd re HospitalF-59000 LilleFrance EA4308:Gametogenesis and Gamete Quality Lille UniversityF-59000 LilleFrance CHU Lille Department of AndrologyCalmette HospitalF-59000 LilleFrance CHU Lille Department of Endocrine Gynaecology and Reproductive MedicineJeanne de Flandre HospitalF-59000 LilleFrance CHU Lille Department of BiostatisticsEA2694Lille UniversityF-59000 LilleFrance Fertility Unit Poissy-Saint-Germain-en-Laye General Hospital78303 PoissyFrance.

Cryptorchidism is one of the most frequent causes of nonobstructive azoospermia(NOA)in *** it is well known that spermatogenesis is more impaired in bilateral than in unilateral cryptorchidism,previous studies have only described small cohorts or inhomogeneous ***,we analyzed a cohort of 225 men with only a history of cryptorchidism as sole etiopathogenetic factor for NOA,and compared testicular sperm extraction(TESE)outcomes between men with bilateral versus unilateral *** results show no difference in follicle-stimulating hormone(FSH)levels and testicular volumes between men with a history of bilateral cryptorchidism compared to unilateral cryptorchidism(median:21.3 IU I^-1 vs 19.3 IU I^-1,P=0.306;and 7.2 ml vs 7.9 ml,P=0.543,respectively).In addition,sperm retrieval rates were similar(66.2%vs 60.0%,P=0.353).Using multivariate analysis,we have found that only a low inhibin B level(above the assay's detection limit)was positively associated with successful sperm retrieval(P<0.05).Regarding intracytoplasmic sperm injection outcomes,we found that cumulative pregnancy rate and live birth rate per cycle were not statistically different between the two groups(17.4%vs 27.8%,P=0.070;and 16.1%vs 26.4%,P=0.067,respectively).Unexpectedly,there was no significant difference in hormonal profiles(FSH,luteinizing hormone[LH],testosterone,and inhibin B levels)and TESE outcomes between unilateral versus bilateral *** suggests that a history of unilateral cryptorchidism could reflect a bilateral testicular ***,inhibin B level might be a predictor of successful TESE.

关键词： cryptorchidism in tracytoplasmic sperm in jection non obstructive azoospermia testicular sperm extraction

SAND: An Additive for Stabilzation of Swelling Clay Soils

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International Journal of Geosciences 2012年第4期3卷 719-725页

作者： Bahia Louafi ramdane Bahar Faculty of Civil Engineering USTHB

An experimental program carried out in this study seeks to understand the physical mechanisms of stabilization of an expansive soil by adding an inert material (sand) at various forms;mixing and intercalation layers of sand. The first aim of the study is to analyze the effect of stabilization on the variation of soil consistency. The results show a marked improvement in soil consistency. Then a study of the effect of the additives on the variation of the swelling in order to solve the lifting structures caused by this phenomenon is carried out. It can be seen that the addition of sand is capable of reducing the swelling action. We complete the study using an ultrasonic device, measuring the propagation velocities of ultrasonic pulse through the tested clay samples. This shows a change occurring in the porosity of the clay when sand is added to it. As a result some interesting conclusions concerning the expansive soil-material amendment are drawn.

关键词： Clay Soils Bentonite Sand Swell Stabilization

Antioxidant antileishmanial cytotoxic and antimicrobial activities of a local plant Myrtus nivellei from Algeria Sahara

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Asian Pacific Journal of Tropical Biomedicine 2017年第8期7卷 702-707页

作者： Farah ramdane Rym Essid Nadia Fares Dahmane El Ouassis Sana Aziz Mahfoud Hadj Mahammed Mohamed Didi Ould Hadj Ferid Limam Biogeochemistry Laboratory in Desert Environments Kasdi Merbah University Faculty of Natural and Life Sciences El Oued University Laboratory of Bioactive Substances Biotechnology Center of Borj-Cedria Technopole National Institute of Forest Research Protection Laboratory of Ecosystem in Arid and Semi Arid Zone Kasdi Merbah University

To study the phytochemical constituents and in vitro biological activities of hydromethanolic extract and fractions from Algerian Sahara Myrtus nivellei (M. nivellei) collected in Hoggar region and to identify the active fraction that can act as an alternative of commonly used antibiotics and as antileishmanial or antioxidant *** screening of M. nivellei aerial parts was realised according to the literature. Extract was firstly prepared by using aqueous methanol then fractionated with ethyl acetate and butanol solvents. Total phenolics, tannis and flavonoids, of the hydromethanolic extract and their fractions were determined by Folin-Ciocalteu method as gallic acid equivalents and by aluminium chloride as rutin equivalent respectively. Extract and fractions were tested for their antimicrobial and antiparasital activities against standard bacteria using agar diffusion method and two kinds of leishmania visceral and cutaneous. The antioxidant activities were realized using phosphomolybdenum, FRAP and DPPH *** phytochemical screening exhibited the presence of flavonoids, tannins, saponins, and alkaloids. The experimental results showed that plant extract and fractions were high in phenolic compounds and exhibited an important role as antioxidant, antimicrobial and had a moderate antileishmanial *** observations lead us toward more studies in this field, so that we can get more benefits from our local Algerian medicinal plants.

关键词： Phenolic compounds Flavonoids Antioxidant activity Antimicrobial activity Antileishmanial activity Myrtus nivellei

Numerical Simulation of Heat Exchanger＇s Length＇s Effect in a Thermoacoustic Engine

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Journal of Physical Science and Application 2015年第1期5卷 61-65页

作者： Mohamed Zouhir Dar ramdane Miloud Abidat Mohamed Hamel Institute of Maintenance and Industrial Security University of Oran BP1524 El M'Naouer Oran 31000 Algerie Applied Mechanics Laboratory USTO-MB BP 1505 Oran El M'Naouer Oran 31000 Algerie

A numerical study of a standing-wave thermoacoustic engine is presented. The aim of this work is to study the effect of increasing the heat exchangers length on the acoustic power. The analysis of the flow and the prediction of the heat transfer are performed by solving the non linear unsteady Navier-Stocks equations using the finite volume method implemented in -ANSYS CFX- CFD code. The results show an increase in the limit cycle acoustic pressure and power as well as the specific work per cycle with the increase of heat exchangers length.

关键词： Thermoacoustic engine CFD heat exchanger acoustic pressure.

Modeling Rules Fission and Modality Selection Using Ontology

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Journal of Software Engineering and Applications 2013年第7期6卷 354-371页

作者： Atef Zaguia Ahmad Wahbi Moeiz Miraoui Chakib Tadj Amar ramdane-Cherif LISV Laboratory Université de Versailles-Saint-Quentin-en-Yvelines Paris France MMS Laboratory Université du Québec école de Technologie Supérieure Montreal Canada

Researchers in computer science and computer engineering devote a significant part of their efforts on communication and interaction between man and machine. Indeed, with the advent of multimedia and multimodal processing in real time, the computer is no longer considered only as a computational tool, but as a machine for processing, communication, collection and control. Many machines assist and support many activities in daily life. The main objective of this paper is to propose a new methodological solution by modeling an architecture that facilitates the work of multimodal system especially for a fission module. To realize such systems, we rely on ontology to integrate data semantically. Ontologies provide a structured vocabulary usedas support for data representation. This paper provides a better understanding of the fission system and multimodal interaction. We present our architecture and the description of the detection of optimal modalities. This is done by using an ontological model that contains different applicable scenarios and describes the environment where a multimodal system exists.

关键词： Multimodal System Multimodal Fission Modality Ontology Interaction Context Pattern