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Orthogonal Codes-Based Dynamic Spectrum Access in Cognitive Radio Network.

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China Communications 2019年第12期16卷 34-46页

作者： Ehab F.Badran Amr A.Bashir Amira I.Zak. waleed k.Badawi Department of Electronics and Communications Engineering Arab Academy for Science Technology and Maritime Transport

Dynamic spectrum access(DSA) in cognitive radio(CR) network. became a challenging research area recently. In CR technology, the DSA between primary users(PUs) and secondary users(SUs) simultaneously can be achieved without degrading the performance of the PUs by SUs interference. This can be achieved by donating incentive power to the PUs in order to compensate the interference caused by the SUs. Consequently, PUs allow SUs to share the spectrum. In this paper, orthogonal codes-based dynamic spectrum access(OC-DSA) technique is proposed. OC-DSA technique employs orthogonality between PUs and SUs transmitted data symbols in addition to the incentive power donation. Compared to other techniques, the proposed technique uses a simple encoder at the SU network.for the same PU network.infrastructure. By applying orthogonal codes, the interference caused by SUs is canceled and hence the donated power to incentivize the PUs is reduced. also, the SU pack.t rate is increased significantly. The simulation results show that the proposed technique provides effective improvements over other existing techniques in the signal strength and the bit error rate performance of both the PU network.and the SU network.at the receiver side. Moreover, the proposed technique requires less donated power to incentivize the PU and has higher pack.t rate.

关键词： cognitive radio dynamic spectrum access orthogonal codes

Solving <i>nth</i>-Order Integro-Differential Equations Using the Combined Laplace Transform-Adomian Decomposition Method

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Applied Mathematics 2013年第6期4卷 882-886页

作者： waleed al-Hayani Department of Mathematics College of Computer Science and Mathematics University of Mosul Mosul Iraq

In this paper, the Combined Laplace Transform-Adomian Decomposition Method is used to solve nth-order integro-differential equations. The results show that the method is very simple and effective.

关键词： Integro-Differential Equations Laplace Transform Method Adomian Decomposition Method

Block.hain-Based Decentralized Authentication Model for IoT-Based E-Learning and Educational Environments

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Computers, Materials & Continua 2023年第5期75卷 3133-3158页

作者： Osama A.k.ashan Sultan alamri waleed alomoush Mutasem k.alsmadi Samer Atawneh Usama Mir Research and Innovation Centers Rabdan AcademyP.O.Box 114646Abu DhabiUnited Arab Emirates College of Computing and Informatics Saudi Electronic UniversityRiyadh13316Saudi Arabia School of Information Technology Skyline University CollegeP.O.Box 1797SharjahUnited Arab Emirates Department of MIS College of Applied Studies and Community ServicesImam Abdulrahman Bin Faisal UniversityP.O.Box 1982DammamSaudi Arabia Department of Computer Science University of WindsorWindsorN9J3Y1Canada

In recent times,technology has advanced significantly and is currently being integrated into educational environments to facilitate distance learning and interaction between *** the Internet of Things(IoT)into education can facilitate the teaching and learning process and expand the context in which students ***,learning data is very sensitive and must be protected when transmitted over the network.or stored in data ***,the identity and the authenticity of interacting students,instructors,and staff need to be verified to mitigate the impact of ***,most of the current security and authentication schemes are centralized,relying on trusted third-party cloud servers,to facilitate continuous secure *** addition,most of these schemes are resourceintensive;thus,security and efficiency issues arise when heterogeneous and resource-limited IoT devices are being *** this paper,we propose a block.hain-based architecture that accurately identifies and authenticates learners and their IoT devices in a decentralized manner and prevents the unauthorized modification of stored learning records in a distributed university *** allows students and instructors to easily migrate to and join multiple universities within the network.using their identity without the need for user *** proposed architecture was tested using a simulation tool,and measured to evaluate its *** simulation results demonstrate the ability of the proposed architecture to significantly increase the throughput of learning transactions(40%),reduce the communication overhead and response time(26%),improve authentication efficiency(27%),and reduce the IoT power consumption(35%)compared to the centralized authentication *** addition,the security analysis proves the effectiveness of the proposed architecture in resisting various attack. and ensuring the security requirements of learning data in the unive

关键词： Block.hain decentralized authentication Internet of Things(IoT) E-learning IoT security

Spontaneous bacterial peritonitis:risk.factors and causative organisms

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Asian Pacific Journal of Tropical Medicine 2009年第6期2卷 52-58页

作者： Mahmoud M al-Bendary Mahmoud Abdel-Aziz waleed A al-Sherbeeny Raghda El-Sayed Farag Abdel-Hady El-Gilany Mohammad Hosam Eldeen Zaghloul Tropical Medicine Unit Community Medicine DepartmentCollege of MedicineMansoura UniversityEgypt Clinical Pathology Department College of MedicineMansoura UniversityEgypt

Objective:To determine the prevalent pathogens responsible for spontaneous bacterial peritonitis(SBP) and their sensitivity pattern,to test the efficiency of different culture techniques in microbial isolation,and to study the diagnostic predictors of such ***:One hundred eight SBP episodes from 92 adult patients were compared to 88 cirrhotic ascites patients cross - matched with age and sex without *** fluid was subjected to cytological,biochemical examination and culture on both conventional and blood culture bottles at the bedside for bacterial identification and antimicrobial susceptibility ***:The prevalence of SBP was 25.02%.Logistic regression analysis revealed that;previous SBP episode,low ascitic fluid protein levels, high serum creatinine and low serum albumin levels were the independent significant predictors of *** forty - five per cent of SBP episodes were detected by conventional culture compared to 73.15%by modified technique with a significant *** - negative bacteria were the cause of SBP in 46(58.23%) culture positive *** coli and Staphylococcus aureus were the most commonly detected organisms. Resistance to different antibiotics was ***:Culture of ascitic fluid in blood culture bottles at bedside increases the sensitivity of SBP *** is a recent increase in Gram - positive pathogen with emergence of multidrug *** recent changes may have an impact on guidelines for management and treatment of SBP in our locality.

关键词： Spontaneous bacterial peritonitis Paracentesis Bedside inoculation Blood bottle culture

A study of in vitro antibacterial activity of lanthanides complexes with a tetradentate Schiff base ligand

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Asian Pacific Journal of Tropical Biomedicine 2013年第5期3卷 367-370页

作者： waleed Mahmoud al Momani Ziyad Ahmed Taha Abdulaziz Mahmoud Ajlouni Qasem Mohammad Abu Shaqra Muaz al Zouby Department of allied Medical Sciences Al Balqa' Applied University Department of Applied Chemical Sciences Jordan University of Science and Technology Medical Diagnostic Laboratories

Objective:To establish the antibacterial activity of lanthanides complexes with a tetradentate Schiff base ligand ***:(N,N'-bis(l-naphthaldimine)-o-phenylenediamine)was prepared from the condensation of 2—hydroxy-1-naphthaldehyde with o-phenylenediamine in a molar ratio of 2:*** antimicrobial activity of the resultant Ln(Ⅲ)complexes was investigated using agar well diffusion and micro-broth dilution techniques;the latter was used to establish the minimum inhibitory concentrations for each compound ***:Most of Ln(Ⅲ)complexes were found to exhibit antibacterial activities against a number of pathogenic bacteria with MICs ranging between 1.95-250.00μg/*** aureus was the most susceptible bacterial species to[Lal(NO_3)_2(H_2O)](NO_3)complex while Shigella dysenteriae and Escherichia coli required a relatively higher MIC(250μg/mL).Trie complexes La(Ⅲ)and Pr(Ⅲ)were effective inhibitors against Staphylococcus aureus,whereas Sm(Ⅲ)complex was effective against Serratia *** the other hand,Gd(Ⅲ),La(Ⅲ)and Nd(Ⅲ)were found to be more potent inhibitors against Pseudompnas aeruginosa than two of commonly used *** remaining Ln(Ⅲ)complexes showed no remark.ble activity as compared to the two standard drugs ***:Tetradentate Schiff base ligand L and its complexes could be a potential antibacterial compounds after further investigation.

关键词： Antimicrobial Biomolecules Organics Synthetic ligands

Optimal Deep Belief Network.Enabled Cybersecurity Phishing Email Classification

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Computer Systems Science & Engineering 2023年第3期44卷 2701-2713页

作者： Ashit k.mar Dutta T.Meyyappan Basit Qureshi Majed alsanea Anas waleed Abulfaraj Manal M.al Faraj Abdul Rahaman Wahab Sait Department of Computer Science and Information Systems College of Applied SciencesAlMaarefa UniversityAd DiriyahRiyadh13713Kingdom of Saudi Arabia Department of Computer Science Alagappa UniversityKaraikudi630003India Department of Computer Science Prince Sultan UniversityRiyadh11586Kingdom of Saudi Arabia Department of Computing Arabeast CollegesRiyadh11583Kingdom of Saudi Arabia Department of Information Systems Faculty of Computing and Information TechnologyKing Abdulaziz UniversityJeddah23613Kingdom of Saudi Arabia Department of Archives and Communication King Faisal UniversityAl AhsaHofuf31982Kingdom of Saudi Arabia

Recently,developments of Internet and cloud technologies have resulted in a considerable rise in utilization of online media for day to day *** results in illegal access to users’private data and compromises *** is a popular attack.which trick.d the user into accessing malicious data and gaining the *** identification of phishing emails can be treated as an essential process in the domain of *** article focuses on the design of bio-geography based optimization with deep learning for Phishing Email detection and classification(BBODL-PEDC)*** major intention of the BBODL-PEDC model is to distinguish emails between legitimate and *** BBODL-PEDC model initially performs data pre-processing in three levels namely email cleaning,tok.nization,and stop word ***,TF-IDF model is applied for the extraction of useful feature ***,optimal deep belief network.DBN)model is used for the email classification and its efficacy can be boosted by the BBO based hyperparameter tuning *** performance validation of the BBODL-PEDC model can be performed using benchmark.dataset and the results are assessed under several *** comparative studies reported the superior outcomes of the BBODL-PEDC model over the recent approaches.

关键词： Cybersecurity phishing email data classification deep learning biogeography based optimization hyperparameter tuning

Numerical Methods for Solving Logarithmic Nonlinear Schrödinger’s Equation

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Journal of Applied Mathematics and Physics 2022年第12期10卷 3635-3648页

作者： Anees al-Harbi waleed al-Hamdan Luwai Wazzan Department of Mathematics King Abdulaziz University Jeddah Saudi Arabia

In this study, we will construct numerical techniques for tack.ing the logarithmic Schrödinger’s nonlinear equation utilizing the explicit scheme and the Crank.Nicolson scheme of the finite difference method. These schemes will be subjected to accuracy and stability tests before being used. Efficacy and robustness of the techniques under consideration will be demonstrated using an exact solution, one-Gausson, as well as conserved quantities. Interaction of two-soliton will be conducted. The numerical findings revealed, the interplay behavior is flexible.

关键词： Explicit Scheme Implicit Scheme Exact Solutions Bounded Domain Stability One Soliton Soliton Interaction Gaussons

Two-sided regularization model based on probabilistic matrix factorization and quantum similarity for recommender systems

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International Journal of Modeling, Simulation, and Scientific Computing 2020年第6期11卷 129-160页

作者： waleed Reafee Marwa alhazmi Naomie Salim Faculty of Computer Studies and Information Technology University of Garden City 11111 KhartoumSudan School of Computing Faculty of Engineering Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia

Nowadays,with the advent of the age of Web 2.0,several social recommendation methods that use social network.information have been proposed and achieved distinct develop***,the most critical challenges for the existing majority of these methods are:(1)They tend to utilize only the available social relation between users and deal just with the cold-start user issue.(2)Besides,these methods are suffering from the lack.of exploitation of content information such as social tagging,which can provide various sources to extract the item information to overcome the cold-start item and improve the recommendation *** this paper,we investigated the efficiency of data fusion by integrating multi-source of ***,two essential factors,user-side information,and item-side information,are ***,we developed a novel social recommendation model called Two-Sided Regularization(TSR),which is based on the probabilistic matrix factorization ***,the effective quantum-based similarity method is adapted to measure the similarity between users and between items into the proposed *** results on the real dataset show that our proposed model TSR addresses both of cold-start user and item issues and outperforms state-ofthe-art recommendation *** results indicate the importance of incorporating various sources of information in the recommendation process.

关键词： Social recommendation explicit friendship implicit friendship correlated items quantum mechanics

Exact Traveling Wave Solutions to Phi-4 Equation and Joseph-Egri (TRLW) Equation and Calogro-Degasperis (CD) Equation by Modified (G'/G²)-Expansion Method

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Journal of Applied Mathematics and Physics 2023年第7期11卷 2103-2120页

作者： Maha al-Harbi waleed al-Hamdan Luwai Wazzan Department of Mathematics King Abdulaziz University Jeddah Saudi Arabia

In this study, we will introduce the modified (G'/G2)-expansion method to explore some of the exact traveling wave solutions of some nonlinear partial differential equations namely, Phi-4 equation, Joseph-Egri (TRLW) equation, and Calogro-Degasperis (CD) equation. As a result, we have obtained solutions for the equations expressed in terms of trigonometric, hyperbolic and rational functions. Moreover, some selected solutions are plotted using some specific values for the parameters.

关键词： Exact Solutions Modified (G'/G2)-Expansion Method Phi-4 Equation Joseph-Egri (TRLW) Equation Calogro-Degasperis (CD) Equation