检索结果-南通市图书馆

Exploring Multi-Task Learning for Forecasting Energy-Cost Resource Allocation in IoT-Cloud Systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第6期79卷 4603-4620页

作者： Mohammad Aldossary hatem A.Alharbi Nasir Ayub Department of Computer Engineering and Information College of EngineeringPrince Sattam Bin Abdulaziz UniversityWadi Al-Dawasir11991Saudi Arabia Department of Computer Engineering College of Computer Science and EngineeringTaibah UniversityMadinah42353Saudi Arabia Department of Creative Technologies Air University IslamabadIslamabad44000Pakistan

Cloud computing has become increasingly popular due to its capacity to perform computations without relying on physical infrastructure,thereby revolutionizing computer ***,the rising energy consumption in cloud centers poses a significant challenge,especially with the escalating energy *** paper tackles this issue by introducing efficient solutions for data placement and node management,with a clear emphasis on the crucial role of the Internet of Things(IoT)throughout the research *** IoT assumes a pivotal role in this study by actively collecting real-time data from various sensors strategically positioned in and around data *** sensors continuously monitor vital parameters such as energy usage and temperature,thereby providing a comprehensive dataset for *** data generated by the IoT is seamlessly integrated into the Hybrid TCN-GRU-NBeat(NGT)model,enabling a dynamic and accurate representation of the current state of the data center *** the incorporation of the Seagull Optimization Algorithm(SOA),the NGT model optimizes storage migration strategies based on the latest information provided by IoT *** model is trained using 80%of the available dataset and subsequently tested on the remaining 20%.The results demonstrate the effectiveness of the proposed approach,with a Mean Squared Error(MSE)of 5.33%and a Mean Absolute Error(MAE)of 2.83%,accurately estimating power prices and leading to an average reduction of 23.88%in power ***,the integration of IoT data significantly enhances the accuracy of the NGT model,outperforming benchmark algorithms such as DenseNet,Support Vector Machine(SVM),Decision Trees,and *** NGT model achieves an impressive accuracy rate of 97.9%,surpassing the rates of 87%,83%,80%,and 79%,respectively,for the benchmark *** findings underscore the effectiveness of the proposed method in optimizing energy efficiency and enhancing the predictive

关键词： Cloud computing energy efficiency data center optimization internet of things(IoT) hybrid models

Enhancing power generation via an adaptive neuro-fuzzy and backstepping maximum-power-point tracking approach for photovoltaic single-ended primary inductor converter system

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Clean Energy 2024年第5期8卷 34-44页

作者： Khalil Chnini Houda Jouini hatem Allagui Abdelkader Mami Laboratory of Energy Applications and Renewable Energy Efficiency(LAPER) Faculty of Sciences of TunisEl Manar UniversityTunis 1068Tunisia

The distinct characteristics of photovoltaic generators related to power and current present a complex problem in terms of opti-mizing their power *** tackle this,maximum-power-point tracking techniques such as the adaptive neuro-fuzzy inference system are frequently utilized for their swift adaptability and reduced *** addition,the backstepping controller is often selected to handle both linear and non-linear systems due to its exceptional *** purpose of this research is to propose an innovative method that merges the adaptive neuro-fuzzy inference system and backstepping controller to refine the tracking of the optimal power point and to bolster the stability of the photovoltaic system in the face of unpredictable scenarios,such as those pre-sented by the Ropp irradiance examination,which utilizes a single-ended primary inductor converter as a stage for power electronics *** conducted using MATLAB®/Simulink®demonstrate that the combination of adaptive neuro-fuzzy inference system and backstepping controller achieves an impressive efficiency of 99.6%and exhibits fast,robust,and accurate responses com-pared with other algorithms such as artificial neural networks combined with the backstepping controller and conventional perturb and observe algorithm.

关键词： MPPT ANFIS backstepping stand-alone PV system SEPIC stability

One-Step to Prepare Lignin Based Fluorescent Nanoparticles with Excellent Radical Scavenging Activity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2024年第5期12卷 895-908页

作者： Xujing Zhang hatem Abushammala Debora Puglia Binbao Lu Pengwu Xu Weijun Yang Piming Ma The Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi214122China Environmental Health and Safety Program College of Health SciencesAbu Dhabi UniversityP.O.Box 59911Abu DhabiUnited Arab Emirates Civil and Environmental Engineering Department Materials Engineering CenterPerugia UniversityUdR INSTMTerni05100Italy

Fluorescent nanomaterials have attracted much attention,due to their unique luminescent properties and promis-ing applications in biomedical *** this study,lignin basedﬂuorescent nanoparticles(LFNP)with high yield(up to 32.4%)were prepared from lignin nanoparticles(LNP)by one-pot hydrothermal method with ethylene-diamine(EDA)and citric *** and chemical structure of LFNP were investigated by SEM,FT-IR,and zeta potential,and it was found that the structure of LFNP changed with the increase of citric acid *** showed the highestﬂuorescence intensity under UV excitation at wavelengths of 375–385 nm,with emis-sion wavelengths between 454–465 nm,and exhibited strong photoluminescence ***,with the increase of citric acid content,the energy gap(ΔE)gradually decreased from 3.87 to 3.14 eV,which corresponds to the gradual enhancement ofﬂuorescence *** also exhibited excellent antioxidant activity,with DPPH free radical scavenging rate increased from 80.8%for LNP up to 96.7%for LFNP,conﬁrming the great potential of these materials for application in biomedicine and cosmetic health care.

关键词： Lignin ﬂuorescent nanoparticles bioactivity photoluminescence mechanism

A new technique of monsplasty as an adjunctive procedure in cases of abdominoplasty:A prospective clinical trial

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Plastic and Reconstructive Surgery 2024年第3期6卷 124-129页

作者： Laila Ahmed Aboul Nasr Sherief Zamer Ahmed Fathy Elsayed Mohamed hatem Elsahar Department of Plastic Surgery Faculty of Medicine Kasr Al-AinyCairo UniversityCairo11562Egypt

Background:No standard monsplasty technique has existed until *** various monsplasty methods have been described,they exhibit high complication rates with sparse postoperative *** that used pubic suspension techniques did not describe exact anatomical landmarks for the mons *** study aimed to improve the aesthetic and functional appearance of the pubic region with long-term results for all grades of pubic ptosis or bulging with abdominoplasty and provide exact anatomical points to anchor the mons to the rectus ***:This non-randomized prospective clinical trial included 30 patients with various degrees of abdominal wall laxity between December 2017 and September *** surgical procedure was performed for female patients with pendulous abdomen,pubic ptosis or bulging,body mass index≤35 kg/m^(2),and age 18–60 *** patients were followed for up to one year;patient satisfaction was assessed before and after surgery regarding aesthetic results and impact on outfits,hygiene,and sexual ***:The marginal homogeneity test revealed a statistically significant patient satisfaction rate regarding outfits,sexual function,hygiene,and *** postoperative complications,seroma(one case)was managed by aspiration,and one case of wound dehiscence was managed conservatively with ***:This study recommends a quick and reproducible monsplasty technique with a low complication rate,a technique that helps determine specific anatomical landmarks for anchoring the mons to the rectus *** this technique with abdominal contouring is advisable for optimal aesthetic results and maintained lymphatic drainage in the pubic region.

关键词： Abdominoplasty Mons ptosis Pubic suspension Skin redundancy

A Glassy Carbon Electrode Modified with Cellulose Nanofibrils from Ammophila arenaria for the Sensitive Detection of L-Trytophan

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Sensor Technology 2024年第3期14卷 35-50页

作者： Sondes Bourigua Feriel Boussema Zayneb Jebali Houcine Barhoumi hatem Majdoub Abderrazak Maaref Nicole Jaffrezic-Renault Laboratory of Advanced Materials and Interfaces Faculty of Sciences University of Monastir Monastir Tunisia Institute of Analytical Sciences University of Lyon Villeurbanne France

L-tryptophan is an essential amino acid for human health. Nanofibrillated cellulose (NFC) from marram grass (Ammophila arenaria) extracted from plants harvested in the center of Tunisia was used for the first time for the modification of a glassy carbon electrode (GCE), for the sensitive detection of L-tryptophan (Trp). After spectroscopic and morphological characterization of the extracted NFC, the GC electrode modification was monitored through cyclic voltammetry. The NFC-modified electrode exhibited good analytical performance in detecting Trp with a wide linear range between 7.5 × 10−4 mM and 10−2 mM, a detection limit of 0.2 µM, and a high sensitivity of 140.0 µA∙mM−1. Additionally, the NFC/GCE showed a good reproducibility, good selectivity versus other amino acids, uric acid, ascorbic acid, and good applicability to the detection of Trp in urine samples.

关键词： Nanofibrillated Cellulose Chitosan Chemically Modified Glassy Carbon Electrode Electrochemical Detection L-Tryptophan

Prevalence and Factors Associated with Anemia among People Living with Human Immunodeficiency Virus Followed at the Outpatient Treatment Centre of Panzi General Referral Hospital in Eastern Democratic Republic of Congo

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Biosciences and Medicines 2024年第3期12卷 259-274页

作者： Marlene Abedi Zalufa Jean-Paulin Mbo Mukonkole Aline Byabene Kusinza Nicolas Vignier Dieudonné Bihehe Masemo David Willy Shamputi Omari Mukanga Lampard Marie hatem Department of Internal Medicine Panzi General Referral Hospital Bukavu Democratic Republic of Congo Evangelical University in Africa Bukavu Democratic Republic of Congo Statistics Department Panzi General Referral Hospital Bukavu Democratic Republic of Congo International Centre for The Advanced Research and Training-ICART Panzi Foundation Bukavu Democratic Republic of Congo Faculty of Medicine University of Kisangani Kisangani Democratic Republic of Congo Service des Maladies Infectieuses et Tropicales CHU Avicenne Bobigny France Sorbonne University Paris France School of Public Health Department of Social and Preventive Medicine Université de Montréal Montréal Canada

Introduction: Anemia in people living with human immunodeficiency virus (PLHIV) is a major health problem. Although anemia often responds to combination antiretroviral therapy, many patients remain anemic despite treatment, and such persistent anemia continues to adversely affect prognosis, regardless of drug response. Scientists have identified some of the factors involved. However, the mechanisms put in place have not been effective in overcoming them. Examples include the withdrawal of zidovudine from antiretroviral treatment lines, iron and folate supplementation, etc. Anemia is still a major concern in HIV-positive patients. The aim of this study is to assess the prevalence of anemia and its associated factors among PLHIV followed up at the outpatient treatment centre (CTA) of the Panzi General Reference Hospital (HGR) in South Kivu, Democratic Republic of Congo (DRC). Method: We conducted a cross-sectional, comparative study of 276 HIV-infected adults on antiretroviral therapy (ART) followed up at the CTA of Panzi HGR. Socio-demographic and nutritional parameters were collected using a survey questionnaire, and clinical assessment and nutritional status were performed at the centre. Hemoglobin, seric albumin and viral load determinations were performed at the HGRP laboratory. We constructed univariate and multivariate logistic regression models to assess factors associated with anemia in people living with HIV/AIDS. Results: We found a prevalence of anemia of 39.4%, including 4.1% severe anemia, 17.7% moderate anemia and 17.5% mild anemia. After multivariate adjustment, the factors associated with anemia in our PLHIV were: moderate undernutrition (aOR = 1.26;95% CI: 1.50 - 4.20;p = 0.001), severe undernutrition (aOR = 115.4;95% CI: 2.04 - 164.52;p = 0.021), hypoalbuminemia (aOR = 2.11;95% CI: 1.87 - 5.10;p = 0.004) and the lower degree of dietary diversity (aOR = 1.56;95% CI: 1.10 - 4.32;p = 0.034). Conclusion: The prevalence of anemia in PLHIV on ART is high.

关键词： Anemia HIV/AIDS Undernutrition PANZI Hospital

Physical and orbital properties of the stellar system HIP 43766

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2021年第5期21卷 84-90页

作者： hatem Widyan Hussam Aljboor Department of Physics Al al-Bayt UniversityMafraq 25113Jordan

In this paper,we present the analysis of the stellar binary system HIP 43766 to determine its *** rely on dynamical modeling and atmospheric modeling with recent data to determine the orbital solution and the physical properties of the *** is a consistency between observed and synthetic photometry obtained using atmospheric *** calculated dynamical mass sum of the system ranged between 1.691 and 2.609 solar masses,while it ranges between 2.0 and 2.1 as estimated utilizing atmospheric *** could be due to inaccuracy in estimating the orbit,which could be modified with future observations with more relative positional *** parameters of the system and the position of the components on the evolutionary tracks show that the system consists of F5 and G5 subgiant stars,mostly formed by fragmentation.A dynamical mass sum is predicted for the system.

关键词： stars:binaries:close stars:binaries:visual stars:individual:HIP 43766

Symbol Error Probability of Incremental Relaying with Distributed/Centralized Relay Selection

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

China Communications 2020年第11期17卷 141-155页

作者： Raed Alhamad hatem Boujemaa Saudi Electronic University College of Computation and InformaticsRiyadh13316Saudi Arabia COSIM-SUPCOM Tunis2083 Tunisia

In this paper,we derive the Symbol Error Probability(SEP)of cooperative systems with incremental relaying and Distributed Relay Selection(DRS).The relays remain idle when the Signal to Noise Ratio(SNR)between the source and destination is larger than ***,we activate a relay using *** nodes transmit only if their SNR is larger than thresholdβ.If the SNRs of more than two relays is larger thanβ,there is a collision and the destination uses only the received signal from the *** all relays have SNR less thanβ,no relay is ***βis optimized to yield the lowest SEP at the *** results are compared to centralized relay selection using opportunistic Amplify and Forward(OAF),Partial and Reactive Relay Selection(PRS and RRS).We compare our results to computer simulations for Rayleigh fading channels.

关键词： incremental relaying distributed relay selection centralized relay selection rayleigh fading channels

Throughput Enhancement for NOMA Systems Using Intelligent Reflecting Surfaces

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第12期73卷 5233-5244页

作者： Raed Alhamad hatem Boujemaa Information Technology Department Saudi Electronic UniversityRiaydhSaudi Arabia UCAR-SUPCOM-COSIM Ariana2083Tunisia

In this article,we optimize the powers associated to Non Orthogonal Multiple Access(NOMA)users,sensing and harvesting duration for Cognitive Radio Networks(CRN).The secondary source harvests energy from node A ***,it senses the channel to detect primary ***,the secondary source transmits a signal that is reflected by Intelligent Reflecting Surfaces(IRS)so that all reflections have a zero phase at any user.A set Ii of reflectors are associated to user *** use ofM=Mi=512,256,128,64,32,16,8 reflectors per user offers 45,42,39,36,33,30,27 dB gain *** absence of *** also suggest the use of IRS in energy *** use P=8 reflectors for energy harvesting and M=Mi=8 reflectors per user for data communications offers 7 and 38 dB gain *** IRSM=Mi=8 and the absence of *** use of P=16 reflectors for energy harvesting and M=Mi=8 reflectors per user for data communications offers 9 and 42 dB gain *** IRS M=Mi=8 and the absence of IRS.

关键词： CRN NOMA spectrum sensing energy harvesting throughput maximization