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key Management Using Chebyshev Polynomials for Mobile Ad Hoc Networks

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China Communications 2017年第11期14卷 237-246页

作者： k.r.ramkumar raman Singh Chitkara University Chandigarh - Patiala National Highways (NH 64)Patiala - 140401 Punjab India Thapar University Patiala- 147004 Punjab India

A dedicated key server cannot be instituted to manage keys for MANETs since they are dynamic and unstable. The Lagrange's polynomial and curve fitting are being used to implement hierarchical key management for Mobile Ad hoc Networks(MANETs). The polynomial interpolation by Lagrange and curve fitting requires high computational efforts for higher order polynomials and moreover they are susceptible to runge's phenomenon. The Chebyshev polynomials are secure, accurate, and stable and there is no limit to the degree of the polynomials. The distributed key management is a big challenge in these time varying networks. In this work, the Chebyshev polynomials are used to perform key management and tested in various conditions. The secret key shares generation, symmetric key construction and key distribution by using Chebyshev polynomials are the main elements of this projected work. The significance property of Chebyshev polynomials is its recursive nature. The mobile nodes usually have less computational power and less memory, the key management by using Chebyshev polynomials reduces the burden of mobile nodes to implement the overall system.

关键词： chebyshev polynomials interpolation secret sharing key management

Classification of Conversational Sentences Using an Ensemble Pre-Trained Language Model with the Fine-Tuned Parameter

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Computers, Materials & Continua 2024年第2期78卷 1669-1686页

作者： r.Sujatha k.Nimala Department of Networking and Communications SRM Institute of Science and TechnologyKattankulathurChengalpattuTamilnadu603203India

Sentence classification is the process of categorizing a sentence based on the context of the *** categorization requires more semantic highlights than other tasks,such as dependence parsing,which requires more syntactic *** existing strategies focus on the general semantics of a conversation without involving the context of the sentence,recognizing the progress and comparing *** ensemble pre-trained language model was taken up here to classify the conversation sentences from the conversation *** conversational sentences are classified into four categories:information,question,directive,and *** classification label sequences are for analyzing the conversation progress and predicting the pecking order of the *** of Bidirectional Encoder for representation of Transformer(BErT),robustly Optimized BErT pretraining Approach(roBErTa),Generative Pre-Trained Transformer(GPT),DistilBErT and Generalized Autoregressive Pretraining for Language Understanding(XLNet)models are trained on conversation corpus with *** tuning approach is carried out for better performance on sentence *** Ensemble of Pre-trained Language Models with a Hyperparameter Tuning(EPLM-HT)system is trained on an annotated conversation *** proposed approach outperformed compared to the base BErT,GPT,DistilBErT and XLNet transformer *** proposed ensemble model with the fine-tuned parameters achieved an F1_score of 0.88.

关键词： Bidirectional encoder for representation of transformer conversation ensemble model fine-tuning generalized autoregressive pretraining for language understanding generative pre-trained transformer hyperparameter tuning natural language processing robustly optimized BErT pretraining approach sentence classification transformer models

Current strategies for reproductive management of gilts and sows in North America

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Journal of Animal Science and Biotechnology 2015年第2期6卷 191-204页

作者： robert r kraeling Stephen k Webel L&r research Associates JBS United Animal Health

Many advances in genetic selection, nutrition, housing and disease control have been incorporated into modern pork production since the 1950s resulting in highly prolific females and practices and technologies, which significantly increased efficiency of reproduction in the breeding herd. The objective of this manuscript is to review the literature and current industry practices employed for reproductive management. In particular the authors focus on assisted reproduction technologies and their application for enhanced productivity. Modern maternal line genotypes have lower appetites and exceptional lean growth potential compared to females of 20 yr ago. Thus, nutrient requirements and management techniques and technologies, which affect gilt development and sow longevity, require continuous updating. Failure to detect estrus accurately has the greatest impact on farrowing rate and litter size. Yet, even accurate estrus detection will not compensate for the variability in the interval between onset of estrus and actual time of ovulation. However, administration of GnrH analogs in weaned sows and in gilts after withdrawal of altrenogest do overcome this variability and thereby synchronize ovulation, which makes fixed-time AI practical. Seasonal infertility, mediated by temperature and photoperiod, is a persistent problem. Training workers in the art of stockmanship is of increasing importance as consumers become more interested in humane animal care. Altrenogest, is used to synchronize the estrous cycle of gilts, to prolong gestation for 2-3 d to synchronize farrowing and to postpone post-weaning estrus. P.G. 600~ is used for induction of estrus in pre-pubertal gilts and as a treatment to overcome seasonal anestrous. Sperm cell numbers/dose of semen is significantly less for post cervical AI than for cervical AI. real-time ultrasonography is used to determine pregnancy during wk 3-5. PGF2a effectively induces farrowing when administered within two d of normal gestati

关键词： Gilts Management Nutrition reproductive technology Sows

High-temperature thermodynamics of silver:Semi-empirical approach

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Chinese Physics B 2017年第11期26卷 400-407页

作者： r H Joshi B Y Thakore P r Vyas A r Jani N k Bhatt Department of Physics Sardar Patel University Department of Physics School of Sciences Gujarat University Sardar Patel Center for Science and Technology Department of Physics M.K.Bhavnagar University

We report high-temperature thermodynamics for fcc silver by combining ab initio phonon dynamics to empirical quadratic temperature-dependent term for anharmonic part of Helmholtz free energy. The electronic free energy is added through an interpolation scheme, which connects ambient condition free electron gas model to Thomas-Fermi *** present study shows good agreement with experimental and reported findings for several thermal properties, and the discrepancy observed in some caloric properties is addressed. The decreases in the product of volume thermal expansion coefficient and isothermal bulk modulus and in the constant volume anharmonic lattice specific heat at high temperature are the clear evidences of proper account of anharmonicity. The present study also reveals that T-2-dependent anharmonic free energy is sufficient for correct evaluation of thermal pressure and conventional Grüneisen parameter. We observe that the intrinsic phonon anharmonicity starts dominating above characteristic temperature, which is attributed to higher order anharmonicity and can be related to higher order potential derivatives. We conclude that the uncorrelated and largeamplitude lattice vibrations at high temperature raise dominating intrinsic thermal stress mechanism, which surpasses the phonon-anharmonism and requires future consideration.

关键词： thermodynamics anharmonicity Grüneisen parameter silver

A discrete model for prediction of radon flux from fractured rocks

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Journal of rock Mechanics and Geotechnical Engineering 2018年第5期10卷 879-892页

作者： k.M. Ajayi k. Shahbazi r Tukkaraja k. katzenstein Department of Mechanical Engineering South Dakota School of Mines and Technology Rapid City SD 57701 USA b Department of Mining Engineering and Management South Dakota School of Mines and Technology Rapid City SD 57701 USA Department of Geology and Geological Engineering South Dakota School of Mines and Technology Rapid City SD 57701 USA

Prediction of radon flux from the fractured zone of a propagating cave mine is basically associated with uncertainty and complexity. For instance, there is restricted access to these zones for field measure- ments, and it is quite difficult to replicate the complex nature of both natural and induced fractures in these zones in laboratory studies. Hence, a technique for predicting radon flux from a fractured rock using a discrete fracture network （DFN） model is developed to address these difficulties. This model quantifies the contribution of fractures to the total radon flux, and estimates the fracture density from a measured radon flux considering the effects of advection, diffusion, as well as radon generation and decay. radon generation and decay are classified as reaction processes. Therefore, the equation solved is termed as the advection-diffusion-reaction equation （ADrE）. Peclet number （Pe）, a conventional dimensionless parameter that indicates the ratio of mass transport by advection to diffusion, is used to classify the transport regimes. The results show that the proposed model effectively predicts radon flux from a fractured rock. An increase in fracture density for a rock sample with uniformly distributed radon generation rate can elevate radon flux significantly compared with another rock sample with an equivalent increase in radon generation rate. In addition to Pe, two other independent dimensionless parameters （derived for radon transport through fractures） significantly affect radon dimensionless flux. Findings provide insight into radon transport through fractured rocks and can be used to improve radon control measures for proactive mitigation.

关键词： radon mass flux radon dimensionless flux Stochastic model Discrete fracture network (DFN) Caving mining method Fractured rocks

response of Photonic Hydrogels of Homogeneous Particles to Uranyl Ions in Aqueous Solutions

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Photonic Sensors 2023年第4期13卷 50-61页

作者： r.G.JOSHI Deepak k.GUPTA P.AMESH P.k.PArIDA T.r.rAVINDrAN Materials Science Group Indira Gandhi Centre for Atomic ResearchA CI of Homi Bhabha National InstituteKalpakkam 603102India Materials Chemistry and Metal Fuel Cycle Group Indira Gandhi Centre for Atomic ResearchA CI of Homi Bhabha National InstituteKalpakkam 603102India Metallurgy and Materials Group Indira Gandhi Centre for Atomic ResearchA CI of Homi Bhabha National Institute(HBNI)Kalpakkam 603102India

We study here the response of photonic hydrogels(PHs),made of photonic crystals of homogeneous silica particles in polyacrylamide hydrogels(SPHs),to the uranyl ions 22 UO_(2)^(2+) in aqueous *** is found that the reflection spectra of the SPH show a peak due to the Bragg diffraction,which exhibits a blue shift in the presence of 22 UO_(2)^(2+).Upon exposure to the SPH,22 UO_(2)^(2+)gets adsorbed on the SPH and forms complex coordinate bonds with multiple ligands on the SPH,which causes shrinking of hydrogel and leads to the blue shift in the diffraction *** amount of the blue shift in the diffraction peak increases monotonically up to 22 UO_(2)^(2+)concentrations as high as 2300μ*** equilibration time for the shift in the Bragg peak upon exposure to 22 UO_(2)^(2+)is found to be~30 *** results are in contrast to the earlier reports on photonic hydrogels of inhomogeneous microgel particles hydrogel(MPH),which shows the threshold 22 UO_(2)^(2+)concentration of~600μM,below which the diffraction peak exhibits a blue shift and a change to a red shift above *** equilibration time for MPH is~300 *** observed monotonic blue shift and the faster time response of the SPH to 22 UO_(2)^(2+)as compared to the MPH are explained in terms of homogeneous nature of silica particles in the SPH,against the porous and polymeric nature of microgels in the *** also study the extraction of 22 UO_(2)^(2+)from aqueous solutions using the *** extraction capacity estimated by the arsenazo-III analysis is found to be 112 mM/kg.

关键词： Photonic hydrogels uranium extraction and monitoring arsenazo-Ⅲ-uranium complex polyacrylamide hydrogel UV-visible spectroscopy

Bianchi Type-I String Cosmological Model with Bulk Viscosity and Time-Dependent Λ term

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Chinese Physics Letters 2011年第9期28卷 31-33页

作者： r.k.Tiwari S.Sharma Department of Mathematics Govt.Model Science CollegeRewa(MP)India Department of Mathematics Rayat Polytechnic CollegeSBS Nagar(Punjab)India

Einstein field equations with the cosmological constant is considered in the presence of bulk viscosity in a Bianchi type-I *** of the field equations are obtained by assuming the following conditions:the bulk viscosity is proportional to the expansion scalarξ∝θ;the expansion scalar is proportional to shear scalarθ∝σ;andΛis proportional to the Hubble parameterΛ∝*** corresponding interpretations of the cosmological solutions are also discussed.

关键词： viscosity Bianchi Cosmo

Power Quality Improvement of Distribution Network Using BESS and Capacitor Bank

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Journal of Modern Power Systems and Clean Energy 2021年第3期9卷 625-632页

作者： F.r.Islam A.Lallu k.A.Mamun k.Prakash N.k.roy University of Sunshine Coast Sip-py DownsAustralia University of South Pacific SuvaFiji kJiulna University of Engineering and Technology KhulnaBangladesh

The power demand around the world is increasing *** aging distribution network architectures are used by the existing utility companies to deliver power to the consumers,which significantly affects the reliability,stability and quality of the delivered *** techniques such as compensation devices have been used by power system engineers and researchers to maintain the quality of power transmitted to end *** this paper,wattage and volt-amp reactive(VAr)planning scheme has been proposed by using the combination of battery energy storage systems(BESS)and compensators to deal with the vulnerability of networks to voltage drop and system *** cost-effective combination of BESS and shunt capacitor bank will then be analyzed to indicate the benefit of the proposed scheme.

关键词： Battery energy storage system(BESS) shunt capacitor bank reliability stability quality volt-amp reactive(VAr)planning distribution network

Density Modulation Experiments on HT-7 Tokamak

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Chinese Physics Letters 2004年第12期21卷 2458-2460页

作者： k.Tanaka 高翔揭银先 r.Sakamoto k.Toi NationalInstituteforFusionScience 322-6Oroshi-choTokiJapan InstituteofPlasmaPhysics ChineseAcademyofSciencesHefei230031

Density modulation experiments are successfully conducted on HT-7 ohmic discharge to investigate particle transport coefficients: diffusion coefficients D and convection velocity V. The particle transport is studied at low (1.5 x 10(19) m(-3)) and high (3 X 10(19) m(-3)) density regimes. The clear differences are observed that D is 0.42m(2)/s and 0.17m(2)/s, V is 4.7 m/s (outward) and 1.6 m/s (inward) for low and high density plasmas respectively, where spatially constant D and V(r) = (r/a)V-0 were assumed for the analysis.

关键词： Plasma physics