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Image Based Smoke Detection Using Source Separation

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光谱学与光谱分析 2019年第3期39卷 982-989页

作者： Ouiem Bchir Mohamed maher ben Ismail Norah Asiri Computer Science Department College of Computer and Information SciencesKing Saud University

In this paper, we propose an automatic image based smoke detection using source separation. In particular, we assume that the region of interest(smoke region) is a linear combination of smoke and background pixels, and we estimate the smoke component. More specifically, we extend the linear hyperspectral unmixing techniques to the context of image based smoke detection in order to separate the smoke component from the background. The proposed approach yields promising results especially with smoke images captured outdoor.

关键词： Pattern recognition Computer science Hyperspectral

X-ray Based COVID-19 Classification Using Lightweight EfficientNet

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Journal on Artificial Intelligence 2022年第3期4卷 167-187页

作者： Tahani Maazi Almutairi Mohamed maher ben Ismail Ouiem Bchir Department of Computer Science King Saud UniversityRiyadh11543Saudi Arabia

The world has been suffering from the Coronavirus(COVID-19)pandemic since its appearance in late ***-19 spread has led to a drastic increase of the number of infected people and deaths *** and accurate diagnosis of positive cases emerged as a natural alternative to reduce the number of serious infections and limit the spread of the *** this paper,we proposed an X-ray based COVID-19 classification system that aims at diagnosing positive COVID-19 ***,we adapted lightweight versions of EfficientNet as backbone of the proposed recognition ***,lightweight EfficientNet networks were used to build classification models able to discriminate between positive and negative COVID-19 cases using chest X-ray *** proposed models ensure a trade-off between scaling down the architecture of the deep network to reduce the computational cost and optimizing the classification *** the experiments,a public dataset containing 7,345 chest X-ray images was used to train,validate and test the proposed models for binary and multiclass classification problems,*** obtained results showed the EfficientNet-elite-B9-V2,which is the lightest proposed model yielded an accuracy of 96%.On the other hand,EfficientNet-lite-B0 overtook the other models,and achieved an accuracy of 99%.

关键词： CNN EfficientNet COVID-19 deep learning CAD system X-ray

A Joint Mobility Management Approach and Data Rate Adaptation Algorithm for IEEE 802.15.4/ZigBee Nodes

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Wireless Sensor Network 2014年第2期6卷 27-34页

作者： Chiraz Chaabane Alain Pegatoquet Michel Auguin maher ben Jemaa Laboratoire d’Electronique Antennes et Télécommunications (LEAT) University of Nice Sophia Antipolis Nice France Laboratoire d’Electronique Antennes et Télécommunications (LEAT) University of Nice Sophia Antipolis Nice France RedCAD University of Sfax Sfax Tunisia RedCAD University of Sfax Sfax Tunisia

This paper presents an original approach to reduce energy consumption in an IEEE 802.15.4/ZigBee cluster tree network related to a backbone network. Our approach uses an enhanced mobility management of end devices combined with a rate adaptation algorithm. The mobility management approach anticipates link disruption and relies on a speculative algorithm that does not require scanning neighbor cells. The joint mobility management and rate adaptation methods are based on the link quality indicator (LQI). It is demonstrated that even in a noisy environment, the energy consumption as well as the latency of mobile devices can be significantly reduced.

关键词： IEEE 802.15.4 Mobility Rate Adaptation Energy Consumption

Role of endoscopic ultrasound in the characterization of solid pseudopapillary neoplasm of the pancreas

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World Journal of Gastrointestinal Endoscopy 2023年第4期15卷 273-284页

作者： Katarzyna M Pawlak Nadeem Tehami ben maher Shujaath Asif Krishn Kant Rawal Daniel Vasile Balaban Mohammed Tag-Adeen Fahd Ghalim Wael A Abbas Elsayed Ghoneem Khaled Ragab Mahmoud El-Ansary Shanil Kadir Sunil Amin Keith Siau Anna Wiechowska-Kozlowska Klaus Mönkemüller Dalia Abdelfatah Abeer Abdellatef Sundeep Lakhtakia Hussein Hassan Okasha Endoscopy Unit Department of GastroenterologyHospital of The Ministry of Interior and AdministrationSzczecin 01-218Poland Interventional Endoscopy Unit University Hospital Southampton NHS Foundation Trust3AX POUnited Kingdom Consultant Gastroenterologist AIG HospitalsHyderabad 500032India Department of Gastroenterology Prime Institute of Digestive SciencesRajkot 360001India Department of Gastroenterology Central Military Emergency University HospitalCarol Davila University of Medicine and PharmacyBucharest 010011Romania Division of Gastroenterology and Hepatology Department of Internal MedicineQena Faculty of MedicineSouth Valley UniversityQena 83511Egypt Department of Endoscopy Shefa Al-Orman HospitalLuxor 85951Egypt Interventional Endoscopy Unit Sainte Marie HospitalOSNY 95520France Department of Internal Medicine Gastroenterology UnitFaculty of MedicineAssuit UniversityAssuit 71511Egypt Department of Gastroenterology and Hepatology Faculty of MedicineMansoura UniversityMansoura 35511Egypt Department of Hepatology and Gastroenterology Theodor Bilharz Research InstituteGiza 12511Egypt Department of Hepatology&Gastroenterology Theodor Bilharz Research InstituteGiza 12511Egypt Department of Gastroenterology Liaquat National Hospital&Medical CollegeKarachi 75900Pakistan

BACKGROUND Solid pseudopapillary neoplasm(SPN)is an uncommon pathology of the pancreas with unpredictable malignant *** ultrasound(EUS)assessment plays a vital role in lesion characterization and confirmation of the tissue ***,there is a paucity of data regarding the imaging assessment of these *** To determine the characteristic EUS features of SPN and define its role in preoperative *** This was an international,multicenter,retrospective,observational study of prospective cohorts from 7 large hepatopancreaticobiliary *** cases with postoperative histology of SPN were included in the *** collected included clinical,biochemical,histological and EUS *** One hundred and six patients with the diagnosis of SPN were *** mean age was 26 years(range 9 to 70 years),with female predominance(89.6%).The most frequent clinical presentation was abdominal pain(80/106;75.5%).The mean diameter of the lesion was 53.7 mm(range 15 to 130 mm),with the slight predominant location in the head of the pancreas(44/106;41.5%).The majority of lesions presented with solid imaging features(59/106;55.7%)although 33.0%(35/106)had mixed solid/cystic characteristics and 11.3%(12/106)had cystic *** was observed in only 4(3.8%)*** pancreatic duct dilation was uncommon,evident in only 2 cases(1.9%),whilst common bile duct dilation was observed in 5(11.3%)*** patient demonstrated a double duct sign at *** and Doppler evaluation demonstrated inconsistent appearances with no emergence of a predictable *** guided biopsy was performed using three different types of needles:Fine needle aspiration(67/106;63.2%),fine needle biopsy(37/106;34.9%),and Sonar Trucut(2/106;1.9%).The diagnosis was conclusive in 103(97.2%)***-seven patients were treated surgically(91.5%)and the post-surgical SPN diagnosis was confirmed in all *** the 2-year

关键词： Solid pseudopapillary neoplasm SPN Frantz tumor Endoscopic ultrasound features EUSguided biopsy Fine needle aspiration/biopsy

Investigation on the Excitation Capacitor for a Wind Pumping Plant Using Induction Generator

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Smart Grid and Renewable Energy 2011年第2期2卷 116-125页

作者： Manel Ouali Mohamed ben Ali Kamoun maher Chaabene University of Sfax Unite de Commande de Machines et Reseaux de Puissance CMERP-ENIS

This paper presents a SEIG-IM system using a self excited induction generator driven by wind turbine and supplying an induction motor which is coupled to a centrifugal pump. A method to describe the steady state performance based on nodal analysis is presented. Furthermore, a dynamic analysis and performance characteristics are examined. The pro-posed methodology is discussed in order to optimize the quantity of the pumped water. Therefore an optimal excitation capacitor for a given wind rotor speed is determined and a suitable operation mode of the system is established.

关键词： SEIG IM Centrifugal Pump Optimal Excitation Capacitor Wind Rotor Speed

Outcome of Nurses with Occupational Dermatitis

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Open Journal of Nursing 2024年第6期14卷 239-251页

作者： Amira Omrane Chayma Harrathi Asma Kheder maher Maoua Malek ben Abdelkader Taoufik Khalfallah Najib Mrizak Mohamed Akrout Mohamed Adnene Henchi Hichem Bel Hadj Ali Department of Occupational Medicine and Ergonomics Taher Sfar Teaching Hospital Mahdia Tunisia Department of Occupational Medicine Houcine Bouzaiene Teaching Hospital Gafsa Tunisia Department of Occupational Medicine Farhat Hached Teaching Hospital Sousse Tunisia Department of Occupational Medicine and Ergonomics Fattouma Bourguiba Teaching Hospital Monastir Tunisia Department of Dermatology Fattouma Bourguiba Teaching Hospital Monastir Tunisia

Background: Occupational dermatitis is considered as the second most common occupational disease. It accounts for 25% of all lost workdays. Several international studies reported a prevalence of occupational dermatitis in healthcare workers between 17% and 55%. This study aims to identify factors that affect the professional outcome of nurses suffering from occupational dermatitis. Methods: This was a multicenter cross-sectional study concerning nurses declared having occupational dermatitis in the central region of Tunisia. A synoptic sheet related to socio-professional and administrative data was completed. A self-administered Questionnaire going over medical and occupational characteristics was completed during a direct interview. Results: The study involved forty nurses working in four public hospitals in the center of Tunisia. Only 37 workers were included in the study. A professional reclassification was introduced among 19 workers (51% of study population). Work-station adaptation was requested in 14 cases (38%). Exposure to allergens in the workplace was eliminated in 20 cases. Two study participants were transferred to other departments (5.4%) and three people retired (8.1%). A statistically significant association was found between professional reclassification and a history of allergic manifestations (p = 0.003). Similarly, a significant association was found between professional reclassification and the allergic agent (p = 0.014). Workstation layout was significantly associated with a history of allergic manifestations (p = 0.039), the palm hand location (p = 0.04), professional eviction (p Conclusion: This study identified the main factors influencing the occupational outcome of nurses suffering from occupational dermatitis. This outcome depended on a history of atopy (especially allergic rhinitis) and sensitization to allergens (thiuram mix).

关键词： Nursing Occupational Dermatitis Hospital

Hospital Night Shift and Its Effects on the Quality of Sleep, the Quality of Life, and Vigilance Troubles among Nurses

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International Journal of Clinical Medicine 2014年第10期5卷 572-583页

作者： Wided Boughattas Olfa El Maalel Ridha ben Chikh maher Maoua Kalboussi Houda Aicha Braham Houssem Rhif Souheil Chatti Faten Debbabi Mohamed Dogui Nejib Mrizak Neurophysiology Department Sahloul Teaching Hospital Sousse Tunisia Occupational Medicine and Professional Pathologies Department Medicine Faculty of Sousse Sousse Tunisia

Introduction: The exposure to shift works, and especially to night shift, goes against the circadian rythmicity of the social man, which brings about a multitude of disruptive effects on health. In a hospital environment, such night shift is necessary so as to ensure the continuity of care. Sleep and vigilance disorders related to this work mode are frequent and often pose adaptation problems. The objective of this study is to detect the harmful effects of night shift on sleep, vigilance and the quality of life of nurses in Farhat Hached Teaching Hospital in Sousse. Material and Methods: It is a cross-sectional study carried out among two groups of nurses: one group performing a fixed night work and the other one working permanently during the day at Farhat Hached Teaching Hospital in Sousse. Data collection is mainly based on validated questionnaires evaluating sleep quality (Pittsburg sleep quality index), daytime sleepiness (Epworth sleepiness scale), sleep typology (Horne and Ostberg questionnaire), and the quality of life (SF-12). An objective evaluation of vigilance was realized by the study of reaction time and error rates to different tasks of “Super lab” software. Results: 50 night and 50 day nurses have been colligated. Both groups were age- and gender-matched. Sleep quality mean index was significantly higher among night nurses in comparison with day nurses (10.2 ± 5.9 versus 6.76 ± 5.16). After multivariate analysis, sleep quality was significantly correlated to age, department, schedule and the choice of schedule. Night shift was not related to daytime sleepiness. The objective analysis of vigilance showed that the reaction time to different tasks exploring the attentional mechanisms, as well as errors rate, were significantly more important among the night group. The mental score of the quality of life was significantly higher among day nurses. However, such difference was not significant with regard to physical score. Conclusion: The findings of our s

关键词： Night Shift Nurse Quality of Life Sleep Vigilance

Buerger’s Disease and Fitness for Work in a Flight Personnel: A Case Report

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Occupational Diseases and Environmental Medicine 2022年第2期10卷 71-77页

作者： Imen Jammeli Asma Aloui Malek ben Abdelkader Zeineb Athimni Marwa Bouhoula Chouchene Asma Imen Kacem maher Maoua Aicha Brahem Houda Kalboussi Olfa El Maalel Souhaiel Chatti Nejib Mrizak University Hospital Farhat Hached Sousse Tunisia Department of Occupational Medicine University Hospital Ibnou El Jazzar Faculty of Medicine of Sousse University of Sousse Sousse Tunisia

Buerger’s disease, also called thromboangiitis obliterans (TAO), is an inflammatory disease affecting small and medium size blood vessels of the limbs. Several risk factors are strongly associated with this disease. In fact, heavy smokers represent 99% of patients diagnosed with Buerger’s disease and smoking cessation can slow down the progression of the pathology. Ulcers and gangrene are very common complications and TAO may also cause a vasculitis as well as ischemic damage to the distal part of the limbs that can eventually lead to limb amputation. Here, we report the case of a 43 years old patient, a flight personnel working in a Tunisian airline company who consults for a lesion of the left toe that appeared 2 weeks ago. He is a chronic inveterate smoker with 36 pack-years. The diagnosis of TAO was made based on the clinical presentation and the results of the Doppler Ultrasound of the left toe. This disease has a major impact on the quality of life due to the risk of necrotic ulcers and amputation. Navigation is a profession that requires a high level of physical and mental fitness. According to the international and Tunisian standards, the applicant or the holder of medical certificate must not have a cardiovascular condition that may affect the safety of the exercise.

关键词： Buerger’s Disease Flight Personnel Medical Fitness

Epidemiology of Occupational Asthma in Tunisia: Results of a First National Study

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Occupational Diseases and Environmental Medicine 2016年第2期4卷 27-36页

作者： Maoua maher El Maalel Olfa Boughattas Wided Chatti Souhail Gharbi Ezzeddine Kammoun Houda Kalboussi Houda Mlaouah Jabrane Abbassi Ammar Brahem Aicha Loukil Mouna Haj Salah Habib ben Khdimallah Khaled Masmoudi Tasnim benzarti Mohamed Debbabi Faten Mrizak Néjib Occupational Medicine and Professional Pathologies Department Faculty of Medicine of Sousse Sousse Tunisia University of Sousse Sousse Tunisia CNAM Regional Centers of Sousse Tunis and Sfax Tunisia English Department Faculty of Medicine of Sousse Sousse Tunisia Forensic Medicine Department Faculty of Medicine of Sousse Sousse Tunisia Department of Pneumology and Allergology Farhat Hached Teaching Hospital Sousse Tunisia

Introduction: Apart from its increasingly important frequency, occupational asthma (OA) has become the most important cause of occupational respiratory disorders in developed countries. The number of etiological agents continues to grow following the constant introduction of new harmful substances in industry. Objectives: Determine the prevalence and incidence of OA in our country, the socio-occupational characteristics of asthmatics, and study the forensic and social impact of such pathology. Material and Methods: An exhaustive retrospective epidemiological study was conducted in Tunisia about charts of occupational asthma cases recognized by the competent commissions of the National Medical Care Fund (CNAM) during the period ranging from January 1st 2000 to December 31st 2008. Results: 361 occupational asthma cases, accounting for a prevalence of 7.17% of all occupational diseases, were recognized during the period of the study. Occupational asthma annual incidence was estimated to be 24.42 cases per 1000000 workers. Our study population was mainly women with a sex ratio of 0.86. More than a half (57.6%) of recognized OA cases were working in the textile industry sector. Concerning the asthmatics’ professional career, most of recognized OA cases (n = 225 i.e. 70.6% of cases) kept their jobs, whereas 58 patients did not. The professional career was linked to gender with a job loss that is 1.79 time more important in asthmatic women. Conclusion: The incidence of occupational asthma in Tunisia is comparable with that found in other Mediterranean countries. A rigorous and adequate prevention is necessary and allows reducing the importance of this occupational pathology and its serious consequences.

关键词： Epidemiology Occupational Asthma Pneumology Allergology Tunisia