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Intelligent Transmission Control for Efficient Operations in SDN

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Computers, Materials & Continua 2022年第5期71卷 2807-2825页

作者： Reem Alkanhel Abid Ali Faisal Jamil Muzammil Nawaz Faisal Mehmood ammar Muthanna Department of Information Technology College of Computer and Information SciencesPrincess Nourah Bint Abdulrahman UniversityRiyadhSaudi Arabia Department of Computer Science University of Engineering and TechnologyTaxila47080Pakistan Department of Computer Science Govt.Akhtar Nawaz Khan(Shaheed)Degree College KTSHaripur22620Pakistan Department of Computer Engineering Jeju National UniversityJeju-siJeju Special Self-Governing Province63243Korea School of Information and Communication Engineering Zhengzhou UniversityChina Department of Telecommunication Networks and Data Transmission The Bonch-Bruevich Saint-Petersburg State University of Telecommunications193232Saint PetersburgRussia Peoples Friendship University of Russia(RUDN University)6 Miklukho-Maklaya St Moscow117198Russian Federation

Although the Software-Defined Network(SDN)is a well-controlled and efficient network but the complexity of open flow switches in SDN causes multiple *** solutions have been proposed so far for the prevention of errors and mistakes in it but yet,there is still no smooth transmission of pockets from source to destination specifically when irregular movements follow the destination host in SDN,the errors include packet loss,data compromise *** accuracy of packets received at their desired destination is possible if networks for pockets and hosts are monitored instead of analysis of network snapshot statistically for the state,as these approaches with open flow switches,discover bugs after their *** article proposes a design to achieve the said objective by defining the Intelligent Transmission Control Layer(ITCL)*** monitors all the connections of end hosts at their specific locations and performs necessary settlements when the connection state changes for one or multiple *** layer informs the controller regarding any state change at one period and controller collects information of end nodes reported via ***,updates flow tables accordingly to accommodate a location-change scenario with a routechange *** is organized on prototype-based implementation using the popular POX *** this paper,it has been discovered that ITCL produces efficient performance in the trafficking of packets and controlling different states of SDN for errors and packet loss.

关键词： Software-defined network ITCL POX open flow

A linear quadratic regulator control of a stand-alone PEM fuelcell power plant

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Frontiers in Energy 2014年第1期8卷 62-72页

作者： Amar BENAISSA Boualaga RABHI ammar MOUSSI Dahmani AISSA Department of Electrical Engineering University of Djelfa cit6 ain chih17000 Algeria MSE Laboratory University of Biskra B.P.145 Biskra 07000 Algeria LARHYS Laboratory University of Biskra B.P.145 Biskra 07000Algeria Thermal Power Station of M'sila M'sila 28000 Algeria

This paper introduces a technique based on linear quadratic regulator （LQR） to control the output voltage at the load point versus load variation from a stand- alone proton exchange membrane （PEM） fuel cell power plant （FCPP） for a group housing use. The controller modifies the optimal gains ki by minimizing a cost function, and the phase angle of the AC output voltage to control the active and reactive power output from an FCPP to match the terminal load. The control actions are based on feedback signals from the terminal load, output voltage and fuel cell feedback current. The topology chosen for the simulation consists of a 45 kW proton exchange membrane fuel cell （PEMFC）, boost type DC/ DC converter, a three-phase DC/AC inverter followed by an LC filter. Simulation results show that the proposed control strategy operated at low commutation frequency （2 kHz） offers good performances versus load variations with low total harmonic distortions （THD）, which is very useful for high power applications.

关键词： modeling of proton exchange membrane fuel cell (PEMFC) controlling of PEMFC. linear quadraticregulator (LQR) DC/DC converter DC/AC inverter

Isolation Enhancement in a Compact Four-Element MIMO Antenna for Ultra-Wideband Applications

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Computers, Materials & Continua 2023年第4期75卷 911-925页

作者： Awais Khan Shahid Bashir Salman Ghafoor Hatem Rmili Jawad Mirza ammar Ahmad Department of Electrical Engineering University of Engineering and TechnologyPeshawar25000Pakistan Department of Electrical Engineering University of Science and TechnologyBannu28100Pakistan School of Electrical Engineering and Computer Science(SEECS) National University of Sciences and Technology(NUST)Islamabad44000Pakistan Electrical and Computer Engineering Department Faculty of EngineeringKing Abdulaziz UniversityJeddahSaudi Arabia K.A.CARE Energy Research and Innovation Center King Abdulaziz UniversityJeddah21589Saudi Arabia SEECS Photonic Research Group National University of Sciences and TechnologyIslamabad44000Pakistan

Mutual coupling reduction or isolation enhancement in antenna arrays is an important area of research as it severely affects the performance of an *** this paper,a new type of compact and highly isolated Multiple-Input-Multiple-Output(MIMO)antenna for ultra-wideband(UWB)applications is *** design consists of four radiators that are orthogonally positioned and confined to a compact 40×40×0.8 mm3 *** final antenna design uses an inverted L shape partial ground to produce an acceptable reflection coefficient(S1120 db for majority of the UWB *** antenna was fabricated and tested with the vector network analyzer(VNA)and in an anechoic chamber for scattering parameters and radiation ***,different MIMO diversity performance metrics are also measured to validate the proposed *** simulation results and the experimental results from the constructed model agree quite *** proposed antenna is compared with similar designs in recently published literature for various performance *** of its low envelope correlation coefficient(ECC9.99 dB),peak gain of 4.6 dB,reduced channel capacity loss(CCL<0.4 b/s/Hz),and average radiation efficiency of over 85%,the proposed MIMO antenna is ideally suited for practical UWB applications.

关键词： Multiple input multiple output antennas envelope correlation coefficient defected ground structure ultra wide band diversity gain

Single step fabrication of N-doped graphene/Si3N4/SiC heterostructures

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Nano Research 2014年第6期7卷 835-843页

作者： Emilio Velez-Fort Emiliano Pallecchi Mathieu G. Silly Mounib Bahri Gilles Patriarche Abhay Shukla Fausto Sirotti abdelkarim Ouerghi CNRS-Laboratoire de Photonique et de Nanostructures (LPN) Route de Nozay Marcoussis 91460 France Universite Pierre et Marie Curie (CNRS - IMPMC) 4 PL Jussieu Paris 75005 France Synchrotron-SOLEIL Saint-Aubin BP48 F91192 Gif sur Yvette Cedex France

In-plane heteroatom substitution of graphene is a promising strategy to modify its properties. The ability to dope graphene with electron-donor nitrogen heteroatoms is highly important for modulating electrical properties of graphene. Here we demonstrate a transfer-free method to directly grow large area quasi free-standing N-doped graphene bilayers on an insulating substrate （Si3N4）. Electron-bombardment heating under nitrogen flux results in simultaneous growth of N-doped graphene and a Si3N4 layer on the SiC surface. The decoupling of N-doped graphene from the substrate and the presence of Si3N4 are identified by X-ray photoemission spectroscopy and low-energy electron diffraction. The substitution of nitrogen atoms in the graphene planes was confirmed using high resolution X-ray photoemission spectroscopy which reveals several atomic configurations for the nitrogen atoms： Graphitic-like, pyridine-like, and pyrrolic- like. Furthermore, we demonstrated for the first time that N-doped graphene could be used to efficiently probe oxygen molecules via nitrogen atom defects.

关键词： epitaxial graphene spectroscopy nitrogen-doped graphene low-energy electronmicroscopy electronic properties

Current Therapeutics in Primary Sclerosing Cholangitis

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Journal of Clinical and Translational Hepatology 2023年第5期11卷 1267-1281页

作者： Natassia Tan John Lubel William Kemp Stuart Roberts ammar Majeed Department of Gastroenterology and Hepatology Alfred HealthCentral Clinical SchoolMonash UniversityMelbourneAustralia

Primary sclerosing cholangitis(PSC)is an orphan,cholestatic liver disease that is characterized by inflammatory biliary strictures with variable progression to end-stage liver *** pathophysiology is poorly *** biliary inflammation is likely driven by immune dysregulation,gut dysbiosis,and environmental exposures resulting in gutliver crosstalk and bile acid metabolism *** is no proven medical therapy that alters disease progression in PSC,with the commonly prescribed ursodeoxycholic acid being shown to improve liver biochemistry at low-moderate doses(15–23 mg/kg/day)but not alter transplant-free survival or liver-related *** transplantation is the only option for patients who develop end-stage liver disease or refractory complications of *** and antifibrotic agents have not proven to be effective,but there is promise for manipulation of the gut microbiome with fecal microbiota transplantation and *** acid manipulation via alternate synthetic bile acids such as norursodeoxycholic acid,or interaction at a transcriptional level via nuclear receptor agonists and fibrates have shown potential in phase II trials in PSC with several leading to larger phase III *** view of the enhanced malignancy risk,statins,and aspirin show potential for reducing the risk of colorectal cancer and cholangiocarcinoma in PSC *** patients who develop clinically relevant strictures with cholestatic symptoms and worsening liver function,balloon dilatation is safer compared with biliary stent insertion with equivalent clinical efficacy.

关键词： Primary sclerosing cholangitis Bile acid Microbiome 24-Norursodeoxycholic acid Farnesoid X receptor agonists Liver transplant

An Intelligent Graph Edit Distance-Based Approach for Finding Business Process Similarities

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Computers, Materials & Continua 2021年第12期69卷 3603-3618页

作者： Abid Sohail ammar Haseeb Mobashar Rehman Dhanapal Durai Dominic Muhammad Arif Butt Department of Computer Science COMSATS University IslamabadLahorePakistan Faculty of Information and Communication Technology Universiti Tunku Abdul RahmanKamparPerakMalaysia Universiti Teknologi PETRONAS Bandar Seri IskandarTronoh PerakMalaysia Punjab University College of Information Technology University of the PunjabLahorePakistan

There are numerous application areas of computing similarity between process *** includes finding similar models from a repository,controlling redundancy of process models,and finding corresponding activities between a pair of process *** similarity between two process models is computed based on their similarity between labels,structures,and execution *** attempts have been made to develop similarity techniques between activity labels,as well as their execution ***,a notable problem with the process model similarity is that two process models can also be similar if there is a structural variation between ***,neither a benchmark dataset exists for the structural similarity between process models nor there exist an effective technique to compute structural *** that end,we have developed a large collection of process models in which structural changes are handcrafted while preserving the semantics of the ***,we have used a machine learning-based approach to compute the similarity between a pair of process models having structural and label ***,we have evaluated the proposed approach using our generated collection of process models.

关键词： Machine learning intelligent data management similarities of process models structural metrics dataset graph edit distance process matching artificial intelligence

A Novel Improved Artificial Bee Colony and Blockchain-Based Secure Clustering Routing Scheme for FANET

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China Communications 2021年第7期18卷 103-116页

作者： Liang Zhao Muhammad Bin Saif ammar Hawbani Geyong Min Su Peng Na Lin Shenyang Aerospace University ShenyangLiaoning 110136China University of Science and Technology of China HefeiChina University of Exeter ExeterUK

Flying Ad hoc Network(FANET)has drawn significant consideration due to its rapid advancements and extensive use in civil ***,the characteristics of FANET including high mobility,limited resources,and distributed nature,have posed a new challenge to develop a secure and ef-ficient routing scheme for *** overcome these challenges,this paper proposes a novel cluster based secure routing scheme,which aims to solve the routing and data security problem of *** this scheme,the optimal cluster head selection is based on residual energy,online time,reputation,blockchain transactions,mobility,and connectivity by using Improved Artificial Bee Colony Optimization(IABC).The proposed IABC utilizes two different search equations for employee bee and onlooker bee to enhance convergence rate and exploitation ***,a lightweight blockchain consensus algorithm,AI-Proof of Witness Consensus Algorithm(AI-PoWCA)is proposed,which utilizes the optimal cluster head for *** AI-PoWCA,the concept of the witness for block verification is also involved to make the proposed scheme resource efficient and highly resilient against 51%*** results demonstrate that the proposed scheme outperforms its counterparts and achieves up to 90%packet delivery ratio,lowest end-to-end delay,highest throughput,resilience against security attacks,and superior in block processing time.

关键词： improved artificial bee colony optimization optimal cluster head selection secure routing blockchain lightweight consensus protocol

Combining Monte Carlo simulations and dosimetry measurements for process control in the Tunisian Cobalt-60 irradiator after three half lives of the source

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Nuclear Science and Techniques 2017年第9期28卷 119-128页

作者： Leila Ounalli Maroua Bhar Arbi Mejri Kais Manai ammar Bouabidi Shayma Mohamed Abdallah Nafaa Reguigui Tunisian Center for Nuclear Sciences and Technology Technopark Sidi Thabet 2020 Ariana Tunisia Laboratory on Energy and Matter for Nuclear SciencesDevelopment Technopark Sidi Thabet 2020 Ariana Tunisia Tunisian Higher Institute of Medical Technologies 9 RueZouhair Essafi 1006 TUNIS 1006 Tunis Tunisia Faculty of Sciences of Tunis Technopark Sidi Thabet2020 Ariana Tunisia College of Science and Arts University of Bisha BishaKingdom of Saudi Arabia

To check the dose uniformity and to determine the efficiency of medical devices sterilization by gamma irradiation after three half lives of the source, calculations of the absorbed dose were carried out. Monte Carlo simulations and dosimetry measurements, were established to study the radiation processing quality control. An isodose chart was created by GEANT4 Monte Carlo code to evaluate the absorbed dose rate uniformity inside the irradiation room from the year of the installation until the year of the source reload. The dose uniformity ratio(DUR) is deduced from maximum and minimum experimental doses in medical devices after three half lives of the source.

关键词：剂量测量蒙特卡洛半衰期过程控制辐照模拟钴-60 突尼斯 Geant4

Solution of KdV and mKdV Equationsusing Darboux Transformation

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Solution of KdV and mKdV Equationsusing Darboux Transformati...

作者： Wael Sulayman Miftah ammar 浙江科技学院

学位级别：硕士

Internal solitary waves(ISWs)are common in the ocean and perform vital functions in a variety of ways,including mass and nutrient movement via *** history of an initial solitary wave solved by a completely nonlinear model,modified model,and Darboux transformation model is observed and compared to the evolution for the weakly nonlinear wave equations,the KDV *** waves or solitons as solutions to the Korteweg-de Vries equation(Kd V)and the mordified-Korteweg-de Vries equation(m Kd V)which are non-linear partial differential equations(PDE)of third order have been of interest already since 150 *** this thesis some of the methods used in solving this equations were observed and collected,the derivation of the equations were observed and the Darboux transformation of the equations was also *** applications of the equation in engineering simulation was investigated by employing the Homotopy perturbation transform method(HPTM)for solving the generic model of nonlinear fifth order Kd V equations for the study of magneto-acoustic waves in plasma.

关键词： shallow water waves Solutions KDV equations Solutions m KDV equations Darboux Transformations HPTM