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A Decentralized and TCAM-Aware Failure Recovery Model in software Defined Data Center Networks

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Computers, Materials & Continua 2025年第1期82卷 1087-1107页

作者： suheib Alhiyari siti Hafizah AB hamid Nur Nasuha Daud Department of Computer system and Technology University of MalayaKuala Lumpur50603Malaysia

Link failure is a critical issue in large networks and must be effectively *** software-defined networks(sDN),link failure recovery schemes can be categorized into proactive and reactive *** schemes have longer recovery times while proactive schemes provide faster recovery but overwhelm the memory of switches by flow *** sDN adoption grows,ensuring efficient recovery from link failures in the data plane becomes *** particular,data center networks(DCNs)demand rapid recovery times and efficient resource utilization to meet carrier-grade *** paper proposes an efficient Decentralized Failure Recovery(DFR)model for sDNs,meeting recovery time requirements and optimizing switch memory resource *** DFR model enables switches to autonomously reroute traffic upon link failures without involving the controller,achieving fast recovery times while minimizing memory *** employs the Fast Failover Group in the OpenFlow standard for local recovery without requiring controller communication and utilizes the k-shortest path algorithm to proactively install backup paths,allowing immediate local recovery without controller intervention and enhancing overall network stability and *** employs flow entry aggregation techniques to reduce switch memory *** of matching flow entries to the destination host’s MAC address,DFR matches packets to the destination switch’s MAC *** reduces the switches’Ternary Content-Addressable Memory(TCAM)***,DFR modifies Address Resolution Protocol(ARP)replies to provide source hosts with the destination switch’s MAC address,facilitating flow entry aggregation without affecting normal network *** performance of DFR is evaluated through the network emulator Mininet 2.3.1 and Ryu 3.1 as sDN *** different number of active flows,number of hosts per edge switch,and different network sizes,the proposed model outperformed vario

关键词： software defined networking failure detection failure recovery restoration protection TCAM size

Intrumer:A Multi Module Distributed Explainable IDs/IPs for securing Cloud Environment

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Computers, Materials & Continua 2025年第1期82卷 579-607页

作者： Nazreen Banu A s.k.B.sangeetha Department of Computer science and Engineering SRM Institute of Science and TechnologyVadapalani CampusChennai600026Tamil NaduIndia

The increasing use of cloud-based devices has reached the critical point of cybersecurity and unwanted network *** environments pose significant challenges in maintaining privacy and *** approaches,such as IDs,have been developed to tackle these ***,most conventional Intrusion Detection system(IDs)models struggle with unseen cyberattacks and complex high-dimensional *** fact,this paper introduces the idea of a novel distributed explainable and heterogeneous transformer-based intrusion detection system,named INTRUMER,which offers balanced accuracy,reliability,and security in cloud settings bymultiplemodulesworking together within *** traffic captured from cloud devices is first passed to the TC&TM module in which the Falcon Optimization Algorithm optimizes the feature selection process,and Naie Bayes algorithm performs the classification of *** selected features are classified further and are forwarded to the Heterogeneous Attention Transformer(HAT)*** this module,the contextual interactions of the network traffic are taken into account to classify them as normal or malicious *** classified results are further analyzed by the Explainable Prevention Module(XPM)to ensure trustworthiness by providing interpretable *** the explanations fromthe classifier,emergency alarms are transmitted to nearby IDsmodules,servers,and underlying cloud devices for the enhancement of preventive *** experiments on benchmark IDs datasets CICIDs 2017,Honeypots,and NsL-kDD were conducted to demonstrate the efficiency of the INTRUMER model in detecting network trafficwith high accuracy for different *** outperforms state-of-the-art approaches,obtaining better performance metrics:98.7%accuracy,97.5%precision,96.3%recall,and 97.8%*** results validate the robustness and effectiveness of INTRUMER in securing diverse cloud environments against sophisticated cyber threats.

关键词： Cloud computing intrusion detection system transformers and explainable artificial intelligence(XAI)

Nucleoside modified mRNA-lipid nanoparticles as a new delivery platform for the repair of the injured spinal cord

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Neural Regeneration Research 2025年第8期20卷 2311-2312页

作者： krisztián Pajer Tamás Bellák Antal Nógrádi Department of Anatomy Histology and EmbryologyAlbert Szent-Györgyi Medical SchoolUniversity of SzegedSzegedHungary

spinal cord injury and treatment opportunities:The adult mammalian spinal cord has a very limited capacity for spontaneous regeneration due to various intrinsic molecular and cellular *** the spinal cord neurons have the capacity to regenerate their axons,the expression of growth inhibitory factors,lack or suppression of proper guidance cues,and profound inflammatory responses do not permit successful regeneration(khyeam et al.,2021).

关键词： injured capacity modified

Thermospheric neutral wind studies over the equatorial region:A review

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Earth and Planetary Physics 2025年第1期9卷 81-100页

作者： siti syazwani Nasuha Idahwati sarudin Nurul shazana Abdul hamid Ahmad Fairuz Omar school of Physics Universiti Sains Malaysia11800 USMPulau PinangMalaysia Department of Applied Physics Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia43600 UKM BangiSelangorMalaysia space science Centre(ANGkAsA) Institute of Climate ChangesUniversiti Kebangsaan Malaysia43600 UKM BangiSelangorMalaysia

Thermospheric neutral winds(TNWs)refer to the neutral gases in the thermosphere circulating as tides,which play a crucial role in the dynamics of the thermosphere-ionosphere system(TIs).Global geospace neutral winds,particularly over the magnetic equator,have been a subject of study for several ***,despite the known importance of neutral winds,a comprehensive understanding and characterization of the winds is still *** ground-based and satellite missions have provided valuable information on the contribution of neutral winds to the global atmospheric ***,efforts in the global monitoring of neutral winds are still lacking,and the drivers behind the behavior of TNWs as well as their influence on the TIs remain *** address these knowledge gaps in the global circulation of TNWs,it is crucial to develop a deep understanding of the neutral wind characteristics over different *** low-latitude equatorial region in particular has been observed to exert complex influences on TNWs because of the unique effects of the Earth’s magnetic field at the dip *** neutral winds over this region will provide valuable insights into the unique dynamics and processes that occur in this region,thereby enhancing our understanding of their role in the overall dynamics of the ***,through empirical observations,an improved ability to accurately model and predict the behavior of this region can be *** review article addresses challenges in understanding equatorial winds by reviewing historical measurements,current missions,and the interactions of ionospheric and thermospheric phenomena,emphasizing the need for comprehensive measurements to improve global atmospheric dynamics and weather forecasting.

关键词： thermospheric neutral wind thermosphere-ionosphere system dip equator equatorial region

Noncommutative singular Black Holes

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Communications in Theoretical Physics 2010年第11期54卷 845-848页

作者： s.hamid Mehdipour Islamic Azad University Lahijan Branch

In this paper, applying the method of coordinate coherent states to describe a noncommutative model of Vaidya black holes leads to an exact （t - r） dependence of solution in terms of the noncommutative parameter σ.... 详细信息

关键词： Vaidya black hole noncommutative gravity black hole remnant

Optimizing artificial neural network-based indoor positioning system using genetic algorithm

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International Journal of Digital Earth 2013年第2期6卷 158-184页

作者： hamid Mehmood Nitin k.Tripathi Remote sensing&Geographic Information systems Field of study School of Engineering and TechnologyAsian Institute of TechnologyPathumthaniThailand

The Global Positioning system(GPs)is expected to play an integral role in the development of digital earth;however,the GPs cannot provide positioning information in regions where a majority of the population spends their time,that is,in urban and indoor ***,alternate positioning systems that work in indoor and urban environments should be developed to achieve the vision of digital ***-Fi-based positioning systems(WPs)stand out because of the near-ubiquitous presence of the associated infrastructure and signals in indoor *** WPs-based fingerprinting is the most widely adopted technique for position determination,but its accuracy is lower than that of techniques such as time of arrival and angle of *** the accuracy is still a challenging task because of the complex nature of the propagation of Wi-Fi ***,a novel server-based,genetic-algorithm-optimized,cascading artificial neural network-based positioning model is *** model is tested in 2D and 3D indoor environments under varying *** model is thoroughly investigated on a real Wi-Fi network,and its accuracy is found to be better than that of other well-known techniques.A mean accuracy of 1.9 m is achieved with 87%of the distance error within the range of 0-3 m.

关键词： indoor positioning systems GNss Wi-Fi positioning artificial neural networks genetic algorithms

Noncommutative Inspired Reissner-Nordstrm Black Holes in Large Extra Dimensions

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Communications in Theoretical Physics 2010年第3期53卷 503-513页

作者： kourosh Nozari s.hamid Mehdipour Department of Physics Faculty of Basic SciencesUniversity of Mazandaran Babolsar IRAN Research Institute for Astronomy and Astrophysics of Maragha Islamic Azad University Lahijan Branch

Recently, a new noncommutative geometry inspired solution of the coupled Einstein Maxwell field equations including black holes in 4-dimension is found. In this paper, we generalize some aspects of this model to the Reissner Nordstrom （RN） like geometries with large extra dimensions. We discuss Hawking radiation process based on noncommutative inspired solutions. In this framework, existence of black hole remnant and possibility of its detection in LHC are investigated.

关键词： quantum gravity black hole thermodynamics noncommutative spacetime large extra dimensions

A multiscale material model for heterogeneous liquid droplets in solid soft composites

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Frontiers of structural and Civil Engineering 2021年第5期15卷 1292-1299页

作者： hamid GHAsEMI Department of Mechanical Engineering Arak University of TechnologyArak 38181-41167Iran

Liquid droplets in solid soft composites have been attracting increasing attention in biological *** contrary with conventional composites,which are made of solid elastic inclusions,available material models for composites including liquid droplets are for highly idealized configurations and do not include all material real *** are also all deterministic and do not address the uncertainties arising from droplet radius,volume fraction,dispersion and *** research revisits the available models for liquid droplets in solid soft composites and presents a multiscale computational material model to determine their elastic moduli,considering nearly all relevant uncertainties and heterogeneities at different length *** effects of surface tension at droplets interface,their volume fraction,size,size polydispersity and agglomeration on elastic modulus,are *** micromechanical material models are incorporated into the presented computational *** results clearly indicate both softening and stiffening effects of liquid droplets and show that the model can precisely predict the effective properties of liquid droplets in solid soft composites.

关键词： liquid in solid soft composite computational modeling multiscale model heterogeneity

Mechanical and microstructural variations in ECAP of Ti-6Al-4V alloy with equiaxed microstructure

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Rare Metals 2022年第8期41卷 2732-2738页

作者： hamid Arabi Mostafa ketabchi s.H.N.Alhosseini Mining and Metallurgical Engineering Department Amirkabir University of TechnologyTehran***Iran University Complex of Material and Manufacturing Malek Ashtar University of TechnologyTehran***Iran

The aim of this study is to investigate mechanical and microstructural variations of Ti-6 Al-4 V acquired through various equal channel angular pressing(ECAP)*** ECAP of Ti-6 Al-4 V alloy with the first equiaxed micros tructure was carried out by an isothermal warm and isothermal die *** A pressing carried out on cylindrical samples at 650℃.Mechanical and microstructural investigations were performed concerning Ti-6 Al-4 V in the first state after 2,4,and 8 *** microscopy(OM)investigation shows that alpha grain size increases and beta grain size decreases with the pass numbers *** phase content initially decreases in the first two ECAP *** results show that more equiaxed alpha grains are achieved after four ECAP *** of X-ray diffraction(XRD)analysis show that crystallite size decreases with the number of passes *** two ECAP passes,a vivid increase in mechanical strength is observed;however,the increment dramatically slows down by the increasing number of passes.

关键词： Ti-6Al-4V alloy Equal channel angular pressing Equiaxed microstructure Mechanical properties