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Advancing Brain Tumor Analysis through Dynamic Hierarchical Attention for Improved segmentation and survival Prognosis

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Computers, Materials & Continua 2023年第12期77卷 3835-3851页

作者： s.Kannan s.Anusuya Department of Computer science and Engineering Malla Reddy College of EngineeringSecunderabadTelunganaIndia Department of Information Technology Saveetha School of EngineeringSaveetha Institute of Medical and Technical SciencesSIMATSChennaiTamil Nadu602117India

Gliomas,the most prevalent primary brain tumors,require accurate segmentation for diagnosis and risk *** this paper,we develop a novel deep learning-based method,the Dynamic Hierarchical Attention for Improved segmentation and survival Prognosis(DHA-IssP)*** DHA-IssP model combines a three-band 3D convolutional neural network(CNN)U-Net architecture with dynamic hierarchical attention mechanisms,enabling precise tumor segmentation and survival *** DHA-IssP model captures fine-grained details and contextual information by leveraging attention mechanisms at multiple levels,enhancing segmentation *** achieving remarkable results,our approach surpasses 369 competing teams in the 2020 Multimodal Brain Tumor segmentation *** a Dice similarity coefficient of 0.89 and a Hausdorff distance of 4.8 mm,the DHA-IssP model demonstrates its effectiveness in accurately segmenting brain *** also extract radio mic characteristics from the segmented tumor areas using the DHA-IssP *** applying cross-validation of decision trees to the selected features,we identify crucial predictors for glioma survival,enabling personalized treatment *** the DHA-IssP model and the desired features,we assess patients’overall survival and categorize survivors into short,mid,in addition to long *** proposed work achieved impressive performance metrics,including the highest accuracy of 0.91,precision of 0.84,recall of 0.92,F1 score of 0.88,specificity of 0.94,sensitivity of 0.92,area under the curve(AUC)value of 0.96,and the lowest mean absolute error value of 0.09 and mean squared error value of *** results clearly demonstrate the superiority of the proposed system in accurately segmenting brain tumors and predicting survival outcomes,highlighting its significant merit and potential for clinical applications.

关键词： survival prediction 3D multimodal MRI brain tumors segmentation CNN U-Net deep learning

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Novel model of thermo-magneto-viscoelastic medium with variable thermal conductivity under effect of gravity

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Applied Mathematics and Mechanics(English Edition) 2020年第5期41卷 819-832页

作者： s.M.sAID Department of Mathematics Faculty of ScienceZagazig UniversityZagazig 44519Egypt Department of Mathematics Faculty of Science and ArtsQassim UniversityBuridah 51931Al-mithnabKingdom of Saudi Arabia

The basic equations for a homogeneous and isotropic thermo-magnetoviscoelastic medium are formulated based on three different theories, i.e., the GreenLindsay(G-L) theory, the coupled(CD) theory, and the Lord-shulman(L-s) theory. The variable thermal conductivity is considered as a linear function of the temperature. Using suitable non-dimensional variables, these basic equations are solved via the eigenvalue approach. The medium is initially assumed to be stress-free and subject to a thermal *** numerical results reveal that the viscosity, the two-temperature parameter, the gravity term, and the magnetic field significantly influence the distribution of the physical quantities of the thermoelastic medium.

关键词： eigenvalue approach variable thermal conductivity thermo-viscoelastic gravity field

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Hybrid Cloud security by Revocable KUNodes-storage with Identity-Based Encryption

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Computer systems science & Engineering 2022年第12期43卷 985-996页

作者： s.saravanakumar s.Chitra Department of Information Technology Paavai Engineering CollegeNamakkal637018India Department of Computer science and Engineering Er.Perumal Manimekalai College of EngineeringHosur63117India

Cloud storage is a service involving cloud service providers providingstorage space to customers. Cloud storage services have numerous advantages,including convenience, high computation, and capacity, thereby attracting usersto outsource data in the cloud. However, users outsource data directly via cloudstage services that are unsafe when outsourcing data is sensitive for users. Therefore, cipher text-policy attribute-based encryption is a promising cryptographicsolution in a cloud environment, and can be drawn up for access control by dataowners (DO) to define access policy. Unfortunately, an outsourced architectureapplied with attribute-based encryption introduces numerous challenges, including revocation. This issue is a threat to the data security of DO. Furthermore,highly secure and flexible cipher text-based attribute access control with role hierarchy user grouping in cloud storage is implemented by extending the KUNodes(revocation) storage identity-based encryption. Result is evaluated using Cloudsim, and our algorithm outperforms in terms of computational cost by consuming32 MB for 150-MB files.

关键词： Cloud computing storage identification based revocation attribute based access control encryption decryption

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standard-state entropies and their impact on the potential-dependent apparent activation energy in electrocatalysis

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Journal of Energy Chemistry 2023年第8期83卷 247-254,I0008页

作者： Kai s.Exner Universty Duisburg-Essen Faculty of ChemstryTheretical Inorganic ChemtryUniversitatsstrae 545141 EssenGemay Cluster of Excellence REsOLV 44801 BochumGermany Center for Nanointegration(CENIDE)Duisburg-Essen 47057 DuisburgGermany

The apparent activation energy,Eapp,is a common measure in thermal catalysis to discuss the activity and limiting steps of catalytic processes on solid-state ***,the electrocatalysis community adopted the concept of Eappand combined it with the Butler-Volmer *** observations though,such as potential-dependent fluctuations of Eapp,are yet surprising because they conflict with the proposed linear decrease in Eappwith increasing *** most common explanation for this finding refers to coverage changes upon alterations in the temperature or the applied electrode *** the present contribution,it is demonstrated that the modulation of surface coverages cannot entirely explain potential-dependent oscillations of Eapp,and rather the impact of entropic contributions of the transition states has been overlooked so *** the case of a nearly constant surface coverage,these entropic contributions can be extracted by a dedicated combination of Tafel plots and temperature-dependent experiments.

关键词： Electrocatalysis standard-state entropy Microkinetic modeling Apparent activation energy Degree of rate control

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Robust Controller synthesis and Analysis in Inverter-Dominant Droop-Controlled Islanded Microgrids

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IEEE/CAA Journal of Automatica sinica 2021年第8期8卷 1401-1415页

作者： s.Mohsen Azizi school of Applied Engineering and Technology and the Department of Electrical and Computer EngineeringNew Jersey Institute of TechnologyNJ 07102 USA

This work investigates the problem of controller design for the inverters in an islanded ***-synthesis controllers and local droop controllers are designed to regulate the output voltages of inverters and share power among them,*** designed controllers alleviate the need for additional sensors to measure the states of the system by relying only on output *** is shown that the designed-synthesis controller properly damps resonant oscillations,and its performance is robust to the control-loop time delay and parameter *** stability of a droop-controlled islanded microgrid including multiple distributed generation(DG)units is analyzed by linearizing the nonlinear power flow model around the nominal operating point and applying theorems from linear *** is indicated that the droop controller stabilizes the microgrid system with dominantly inductive tie-line impedances for all values of resistive-inductive loads,while for the case of resistive-capacitive loads the stability is conditioned on an upper bound on the load *** robust performance of the designed-synthesis controller is studied analytically,compared with the similar analysis in an control(benchmark)framework,and verified by simulations for a four DG benchmark ***,the robustness of the droop controllers is analyzed by Monte Carlo simulations in the presence of local voltage fluctuations and phase differences among neighboring DGs.

关键词： Droop control inverter microgrid Monte Carlo simulation robust control μ-synthesis

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seismic performance of precast shear wall-slab connection under cyclic loading: experimental test vs. numerical analysis

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Earthquake Engineering and Engineering Vibration 2020年第3期19卷 739-757页

作者： Arthi s Jaya KP Department of Civil Engineering Anna UniversityChennai 600025India

The structural behaviour of precast shear wall-diaphragm connection was compared with the monolithic connection under seismic *** monolithic connection was made by using U-bars connecting shear wall and slab,and the precast connection was made by using dowel bars in two ***,U-shaped dowel bars from the precast shear wall lower panel and precast slab were connected by the longitudinal reinforcement,and screed concreting was done above the precast ***,the shear wall upper panel was connected using the dowel bar protruding from the shear wall lower *** gap between the dowel bars and the duct was filled with non-shrink *** specimens were subjected to reverse cyclic loading at the ends of the *** study also aimed to develop a 3-D numerical model using ABAQUs *** non-linear properties of concrete were defined by using the concrete damaged plasticity(CDP)model to analyse the response of the *** precast dowel connection between the shear wall and slab showed superior performance concerning ductility,strength,stiffness and energy *** developed finite element model exactly predicted the behaviour of connections as similar to that of experimental testing in the *** average difference between the results from finite element analysis and experimental testing was less than 20%.The results point to the conclusion that the shear resistance is provided by the dowel bars and the stiffness of the precast specimen is due to the diaphragm action of the precast *** damage parameter and the interaction between structural members play a crucial role in the modelling of precast connections.

关键词： precast loading stiffness

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Population Ecology of the Endangered Himalayan Yew in Khokhan Wildlife sanctuary of North Western Himalaya for Conservation Management

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Journal of Mountain science 2008年第3期5卷 257-264页

作者： shreekar Pant s.s.samant Centre for Biodiversity studies School of Biosciences & BiotechnologyBaba Ghulam Shah Badshah UniversityRajouriJ&KIndia G.B.Pant Institute of Himalayan Environment & Development Himachal UnitMohal-Kullu-175126Himachal PradeshIndia

The Himalayan Yew (Taxus baccata subsp. wallichiana) is an endangered native high value medicinal plant of the Himalayan Region. The several medicinal properties of the bark and leaves of this species have increased its risk of extinction due to pressures for utilization. It is also subjected to harvest for fuelwood. The species does not regenerate well from seed and that is another risk factor. The objective of this research was to investigate the population ecology of the species as a foundation for its conservation. six forest communities in the Khokhan Wildlife sanctuary where the species is present were sampled. The abundance of the species, impacts of harvesting and its current regeneration patterns indicate that it may soon be extirpated from the sanctuary. A plan for conserving the remaining sub-populations is presented. It could provide a template for conservation in other locations where the species is at risk.

关键词： Anthropogenic Pressure Conservation Management Himalayan Yew Khokhan Wildlife sanctuary Regeneration

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study of Radially Varying Magnetic Field on Blood Flow through Catheterized Tapered Elastic Artery with Overlapping stenosis

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Communications in Theoretical Physics 2015年第11期64卷 537-546页

作者： s.Nadeem s.Ijaz Department of Mathematics Quaid-i-Azam University

A precise model has been developed for studying the inBuence of metallic nanoparticles on blood Row through catheterized tapered elastic arteries with radially varying magnetic *** model is solved under the mild stenosis approximation by considering blood as viscous *** influence of different Bow parameters associated with this problem such as Hartmann number,nanoparticle volume fraction,Grashof number and heat source or sink parameter is analyzed by plotting the graphs of the wall shear stress,resistance impedance to blood flow and stream *** inEuence of the radially varying magnetic field on resistance impedance to Bow is analyzed and it is observed that the signiBcantly strong magnetic force tends to increase in resistance.

关键词： blood flow overlapping stenosis radially varying m

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setpoint Feasibility and stability of Wind Park Control Interactions at Weak Grids

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Journal of Modern Power systems and Clean Energy 2022年第6期10卷 1790-1796页

作者： Argüello Andrés IEEE the school of Electrical Engi‐neering and Computation University of CampinasCampinasBrazil

The controllers of wind parks that are connected to weak grids can induce unstable oscillations near the fundamental *** phenomenon can be studied with equivalent impedances of the wind generators,which depend on their operational setpoints at the fundamental *** feasibility of such setpoint,i.e.,solution to the power flow,does not depend on the control ***,oscillations from unfeasible setpoints and control instabilities both occur at weak grids and near the fundamental *** letter presents an exploratory study to map the conditions where both phenomena occur,using sensitivity studies comprising multiple setpoints and control parameter *** results are visually presented as the regions which inform the configurations leading to unfeasible setpoints,and unstable control interaction *** the results,it can be observed that the trajectory of the eigenvalues in the Nyquist plots towards an unfeasible setpoint approaches a fundamental frequency instability.

关键词： Control interaction impedance power quality resonance stability wind generator

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Quality of service support in RPL Networks:standing state and Future Prospects

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Journal of Computer science & Technology 2022年第2期37卷 344-368页

作者： Ibrahim s.Alsukayti Department of Computer science College of ComputerQassim UniversityBuraydah 51452Saudi Arabia

The development of IP-based Internet of Things(IoT)networks would facilitate more effective end-to-end IP network architectures,but it remains a *** routing needs to be effectively addressed in the IoT environments of scarce computational and energy ***,the Internet Engineering Task Force(IETF)has specified the IPv6 Routing Protocol for Low Power and Lossy Network(RPL)to provide a bespoke IPv6-based routing framework for IoT ***,RPL comes with no Quality of service(Qos)support which is an essential requirement for many IoT *** network research community has introduced a number of research proposals enhancing RPL with different Qos *** paper presents a review of these proposed solutions and aims to establish a firm understanding of recent Qos developments for RPL and possible areas for future IoT routing *** focus is on comprehending the protocol and networking properties that can affect Qos performance in RPL *** is also given to different objective functions developed for addressing varying Qos aspects such as throughput,delay,and packet *** is also extended in a number of Qos solutions following different approaches at the MAC,network,and application ***,there is still a need for further developments to address effective Qos support,particularly for dynamic RPL networks.

关键词： Internet of Things low power and lossy network quality of service routing protocol

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