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Blockchain-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.Khashan 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 blockchain-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 attacks and ensuring the security requirements of learning data in the unive

关键词： Blockchain decentralized authentication Internet of Things(IoT) E-learning IoT security

FINITE ELEMENT ANALYSIS FOR CHIP FORMATION IN HIGH SPEED TURNING OPERATIONS BY ARBITRARY LAGRANGIAN EULERIAN METHOD

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Chinese Journal of Mechanical Engineering 2006年第4期19卷 480-482页

作者： usama Umer School of Mechanical and Vehicular Engineering Beijing Institute of Technology Beijing 100081China

A two-dimensional finite element （FE） model for the high speed turning operations when orthogonally machining AISI H13 tool steel at 49HRC using poly crystalline cubic boron nitride （PCBN） is described. An arbitrary Lagrangian Eulerian （ALE） method has been adopted which does not need any chip separation criteria as opposed to the traditional Lagrangian approach. Through FE simulations temperature and stresses distributions are presented that could be helpful in predicting tool life and improving process parameters. The results show that high temperatures are generated along the tool rake face as compared to the shear zone temperatures due to high thermal conductivity of PCBN tools.

关键词： Chip formation Finite element(FE) Arbitrary Lagrangian Eulerian (ALE)

Confidential computing and related technologies:a critical review

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Cybersecurity 2023年第4期6卷 26-32页

作者： Muhammad usama Sardar Christof Fetzer Faculty of Computer Science Technische Universität DresdenDresdenGermany

This research critically reviews the definition of confidential computing(CC)and the security comparison of CC with other related technologies by the Confidential Computing Consortium(CCC).We demonstrate that the definitions by CCC are ambiguous,incomplete and even *** also demonstrate that the security comparison of CC with other technologies is neither scientific nor *** highlight the issues in the definitions and comparisons and provide initial recommendations for fixing the *** recommendations are the first step towards more precise definitions and reliable comparisons in the future.

关键词： Confidential Computing(CC) Trusted Execution Environment(TEE) Homomorphic Encryption(HE) Trusted Platform Module(TPM) Formal methods

Applications of synchrophasor technologies in power systems

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Journal of Modern Power Systems and Clean Energy 2019年第2期7卷 211-226页

作者： Muhammad usama USMAN M. Omar FARUQUE Department of Electrical and Computer Engineering Center for Advanced Power Systems Florida State University

Synchrophasors are time-synchronized electrical measurements that represent both the magnitude and phase angle of the electrical sinusoids. Synchrophasors are measured by fast time-stamped devices called phasor measurement units(PMUs) to constitute the basis of realtime monitoring and control actions in the electric *** to its enhanced situational awareness capabilities,many applications of PMUs are presented in the literature in the past decades. This paper presents a comprehensive summary of synchrophasor technology, its architecture,optimal placement techniques and its applications in electric power transmission and distribution systems. These applications include wide-area situational awareness and monitoring, state estimation, fault location and protective relaying, islanding detection etc. This review also covers some of the existing challenges in its implementation and its potential applications.

关键词： Phasor measurement unit(PMU) Supervisory control and data acquisition(SCADA) Synchrophasor technology(ST) Power system

The BV Formalization of Chern-Simons Theory on Deformed Superspace

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Communications in Theoretical Physics 2012年第11期58卷 704-710页

作者： mir Faizal Mathematical Institute University of OxfordOxford OX1 3LBEngland

In this paper we will study non-abelian Chern-Simons theory on a deformed superspace. We will deform the superspace in such a way that it includes the noncommutativity between bosonic and fermionic coordinates. We will first analyse the BRST and the anti-BRST symmetries of the Chern-Simons theory on this deformed superspace. Then we will analyse the extended BRST and the extended anti-BRST symmetries of this theory in the Batalin-Vilkovisky (BV) formalism. Finally, we will express these extended BRST and extended anti-BRST symmetries in extended superspace formalism by introducing new Grassmann coordinates.

关键词： noncommutative superspace Batalin-Vilkovisky formalism

Vault RNAs(vtRNAs):Rediscovered non-coding RNAs with diverse physiological and pathological activities

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Genes & Diseases 2024年第2期11卷 772-787页

作者： Mahsa Aghajani mir Deputy of Research and Technology Health Research InstituteBabol University of Medical SciencesBabol 47176-4774Iran

The physicochemical characteristics of RNA admit non-coding RNAs to perform a different range of biological acts through various mechanisms and are involved in regulating a diversity of fundamental ***,some reports of pathological conditions have proved abnormal expression of many non-coding RNAs guides the *** RNAs are a class of non-coding RNAs containing stem regions or loops with well-conserved sequence patterns that play a fundamental role in the function of vault particles through RNA-ligand,RNA–RNA,or RNA-protein *** together,vault RNAs have been proposed to be involved in a variety of functions such as cell proliferation,nucleocytoplasmic transport,intracellular detoxification processes,multidrug resistance,apoptosis,and autophagy,and serve as microRNA precursors and signaling *** decades of investigations devoted,the biological function of the vault particle or the vault RNAs is not yet completely *** this review,the current scientific assertions of the vital vault RNAs functions were discussed.

关键词： ncRNA Vault complex Vault RNA vtRNA viral infection tumorigenesis

M-Theory in the Gaugeon Formalism

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Communications in Theoretical Physics 2012年第4期57卷 637-640页

作者： mir Faizal Department of Mathematics Durham UniversityDurhamDH1 3LEUnited Kingdom

In this paper we will analyse the Aharony-Bergman-Jafferis-Maldacena(ABJM) theory in N = 1 superspace *** then study the quantum gauge transformations for this ABJM theory in gaugeon *** will also analyse the extended BRST symmetry for this ABJM theory in gaugeon formalism and show that these BRST transformations for this theory are nilpotent and this in turn leads to the unitary evolution of the S-matrix.

关键词： ABJM gaugeon BRST N = 1 superspace

Multiverse in the Third Quantized Formalism

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Communications in Theoretical Physics 2014年第11期61卷 697-700页

作者： mir Faizal Department of Physics and Astronomy University of WaterlooWaterloo Ontario N2L 3G1 Canada

In this paper we will analyze the third quantization of gravity in path integral formalism. We will use the time-dependent version of Wheeler–DeW itt equation to analyze the multiverse in this formalism. We will prop... 详细信息

关键词： third quantization baryogensis Wheeler–De Witt equation

Vertical impedance functions of pile groups under low-to-high loading amplitudes:numerical simulations and experimental validation

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Earthquake Engineering and Engineering Vibration 2023年第3期22卷 647-666页

作者： usama Zafar Chandra Shekhar Goit Masato Saitoh Riku Fukuda School of Science and Engineering Saitama University255 Shimo-OkuboSaitamaJapan

Piles in a group experience additional displacements in soil due to pile-to-pile interactions apart from those resulting from the external *** effect of these interactions determined assuming soil as an elastic and/or viscoelastic material on pile head impedance functions of the pile group is studied by relating the group stiffness to the static stiffness of a single ***,the prevailing elastic solutions may misestimate the resulting pile group response due to the lack of consideration for either soil(material)and/or soil-pile interface *** is well established that soil behaves nonlinearly under moderate-to-high loading amplitudes,and besides,the soil-pile interface nonlinearity can exist even at small loading *** study addresses the effects of these nonlinearities on the vertical impedance functions of a 3×3-pile group using numerical methods by direct analyses and superposition using pile-to-pile interaction *** numerical results are validated using scaled model tests under 1 g *** results highlight the overestimation of pile-to-pile interactions in the pile group when assuming elastic soil *** cases either by direct analyses or superposition approach involving soil and soil-pile interface nonlinearities agree well with the experimental pile group responses under close-to-elastic and nonlinear conditions.

关键词： impedance functions numerical simulations model-scale experiment superposition approach soil-pile interface nonlinearity