检索结果-南通市图书馆

Minimizing transmission loss using inspired ant colony optimization and Markov Chain Monte Carlo in underwater WSN environment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Ocean Engineering and Science 2019年第4期4卷 317-327页

作者： Raj Priyadarshini R sivakumar N Department of Computer Science and Engineering Pondicherry Engineering CollegeEast Coast RoadPillaichavadiPuducherry 605014India

In Underwater Wireless Sensor Networks(UWSNs),the most important challenging issues are propagation delay,high error probability,high latency,high communication cost,limited bandwidth,limited memory,low packet delivery ratio,and transmission *** our proposed work,the various efforts are taken to minimize the propagation delay and transmission loss during data transmission in an underwater environment.A hybrid mechanism is implemented to improve energy efficiency for faster data transmission in underwater *** the underwater environment of acoustic channel condition,propagation delay and transmission loss lead to high complexity in accessing the information and also it is difficult to obtain the Channel Status Information(CSI).To address this problem,Ant Colony Optimization(ACO)routing with Markov Chain Monte Carlo(MCMC)algorithm is used and to capture the transmission loss in the MCMC approach,CSI Forecast Prediction(FP)algorithm is *** experimental simulations are evaluated by utilizing the performance evaluation metrics such as Transmission Loss,Probability Density Function,Average Delay and *** the simulation results it is evident that the proposed algorithm,ACO-MCMC has recorded the minimum transmission loss,increase in probability density function,minimum average delay and maximum throughput of the network when compared to the existing algorithms.

关键词： UWSN ACO-MCMC CSI Markov Chain Monte Carlo Transmission loss Probability density function

A COMPARATIVE STUDY OF THE INVENTORY SYSTEM WITH SERVICE FACILITY AND POSTPONED DEMANDS

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2014年第2期23卷 176-195页

作者： J.Sebastian Arockia Jenifer B.sivakumar School of Mathematics Madurai Kamaraj University

In this article, we present a continuous review （s,S） inventory system with a service facility consisting of finite buffer （capacity N ） and a single server. The customers arrive according to a Poisson process. The individual customer＇s unit demand is satisfied after a random time of service, which is assumed to be exponential. When the inventory level drops to s＇an order for Q（= S-s） items is placed. The lead time of reorder is assumed to be exponential distribution. An arriving customer, who finds the buffer is full, enters into the pool of infinite size or leaves the system according to a Bernolli trial. At the time of service completion, if the buffer size drops to a preassigned level L （1 〈 L 〈 N） or below and the inventory level is above s, we select the customers from the pool according to two different policy ： in first policy, with probability p （0 〈 p 〈 1） we select the customer from the head of the pool and we place the customer at the end of the buffer; in the second policy, with p （0 〈 p 〈 1） the customer from the pool is transferred to the buffer for immediate service and after completion of his service we provide service to the customer who is in the buffer with probability one. If at a service completion epoch the buffer turns out to be empty, there is at least one customer in the pool and the inventory level is positive, then the one ahead of all waiting in the pool gets transferred to the buffer, and his service starts immediately. The joint probability distribution of the number of customers in the pool, number of customers in the buffer and the inventory level is obtained in the steady-state case. Various stationary system performance measures are computed and total expected cost rate is calculated. A comparative result of two models is illustrate numerically.

关键词： Continuous review inventory system postponed demands service facility finite waiting hall pool with infinite size

Enhanced Disease Identification Model for Tea Plant Using Deep Learning

在线全文

学校读者我要写书评

暂无评论

Intelligent Automation & Soft Computing 2023年第1期35卷 1261-1275页

作者： Santhana Krishnan Jayapal sivakumar Poruran Department of Electronics and Communication Engineering University College of EngineeringThirukkuvalaiNagapattinamTamilnadu610204India Department of Electronics and Communication Engineering Dr.NGP Institute of TechnologyCoimbatoreTamilnadu641048India

Tea plant cultivation plays a significant role in the Indian *** Tea board of India supports tea farmers to increase tea production by preventing various diseases in Tea *** climatic factors and other parameters cause these *** this paper,the image retrieval model is developed to identify whether the given input tea leaf image has a disease or is *** in image retrieval is a hot topic in the industry as it doesn’t require any form of metadata related to the images for storing or *** Hashing with Integrated Autoencoders is our proposed method for image retrieval in Tea Leaf *** is an efficient andflexible way of retrieving Tea Leaf *** has an integrated autoencoder which makes it better than the state-of-the-art methods giving better results for the MAP(mean average precision)scores,which is used as a parameter to judge the efficiency of the *** autoencoders used with skip connections increase the weightage of the prominent features present in the previous *** constitutes a hybrid model for hashing and retrieving images from a tea leaf data *** proposed model will examine the input tea leaf image and identify the type of tea leaf *** relevant image will be retrieved based on the resulting type of *** model is only trained on scarce data as a real-life scenario,making it practical for many applications.

关键词： Image retrieval autoencoders deep hashing plant disease tea leaf blister blight

Effect of quarry dust addition on the performance of controlled low-strength material made from industrial waste incineration bottom ash

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2012年第6期19卷 536-541页

作者： Naganathan sivakumar Abdul Razak Hashim Abdul Hamid Siti Nadzriah Department of Civil Engineering University of MalayaKuala Lumpur 50603Malaysia Kualiti Alam Sendirian Berhad Port Dickson 71000Malaysia

The performance of industrial waste incineration bottom ash in controlled low-strength material （CLSM） was investigated in this paper, as the quarry dust was added. CLSM mixtures were made from the industrial waste incineration bottom ash, quarry dust, and cement. Tests for fresh density, bleeding, compressive strength, shear strength, hydraulic conductivity, and excavatability were carried out. The com- pressive strength ranges from 60 kPa to 6790 kPa, the friction angle varies from 5°to 19°, and the cohesion is from 4 to 604 kPa. Most of the mixtures are found to be non-excavatable. It is indicated that the quarry dust addition increases the compressive strength and shear parame- ters, decreases bleeding, and increases the removability modulus.

关键词： industrial waste treatment waste incineration ashes quarries dust hydraulic conductivity strength of materials

Alkali and Silane Treatments towards Exemplary Mechanical Properties of Kenaf and Pineapple Leaf Fibre-reinforced Composites

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2020年第2期17卷 380-392页

作者： Ng Lin Feng sivakumar Dhar Malingam Nadlene Razali Sivarao Subramonian Centre for Advanced Research on Energy Fakulti Kejuruteraan MekanikalUniversiti Teknikal Malaysia MelakaMelaka 76100Malaysia Fakulti Kejuruteraan Pembuatan Universiti Teknikal Malaysia MelakaMelaka 76100Malaysia

Following the contemporary research trend of exploring the potential of eco-friendly natural fibres,this work studies the effects of alkali and silane treatments,with varying concentrations,on the mechanical characterization of composites reinforced with kenaf and pineapple leaf fibre(PALF).Kenaf-and PALF-based composites were fabricated through the heat compression *** mechanical characterization was then performed to evaluate the tensile,flexural and impact *** findings concluded that chemical treatments indeed enhanced the mechanical properties of composite materials.5%NaOH and 3%silane treatments can respectively provide the optimum mechanical properties to the kenaf fibre and PALF reinforced *** treatment results evidenced that silane-treated composites exhibit higher mechanical properties compared to the NaOH-treated *** comparing the mechanical properties of kenaf-and PALF-reinforced polypropylene composites,the overall results show that composites based on PALF have superior mechanical properties.

关键词： natural fibres kenaf fibre pineapple leaf fibre chemical treatment mechanical properties

Influence of magnetically constricted arc traverse speed (MCATS) on tensile properties and microstructural characteristics of welded Inconel 718 alloy sheets

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2021年第4期17卷 1395-1413页

作者： Tushar Sonar Visvalingam Balasubramanian Sudersanan Malarvizhi Thiruvenkatam Venkateswaran Dhenuvakonda sivakumar Centre for Materials Joining and Research(CEMAJOR) Department of Manufacturing EngineeringAnnamalai UniversityAnnamalai Nagar608002Tamilnadu StateIndia Heat Treatment and Welding Metallurgy Division(HWMD) Materials and Metallurgy Group(MMG)Vikram Sarabhai Space Centre(VSSC)ISROThiruvananthpuram695022Kerala StateIndia

The magnetically constricted arc technique was implemented to mitigate the heat input related metallurgical problems in Gas Tungsten Arc Welding(GTAW)of Inconel 718 alloy particularly Nb segregation and subsequent laves phase evolution in fusion *** paper reports the direct effect of magnetically constricted arc traverse speed(MCATS)on bead profile,tensile properties and microstructural evolution of Inconel 718 alloy sheets joined by Gas Tungsten Constricted Arc Welding(GTCAW)*** mechanism amenable for the microstructural modification and corresponding influence on the tensile properties of joints is investigated both in qualitative and quantitative manner related to the mechanics of arc constriction and *** is correlated to the solidification conditions during *** relationship between MCATS and Arc Constriction Current(ACC)was *** interaction effect on the magnetic arc constriction and joint performance was *** showed that the joints fabricated using CATS of 70 mm/min exhibited superior tensile properties(98.39% of base metal strength with 31.50% elongation).It is attributed to the grain refinement in fusion zone microstructure leading to the evolution of finer,discrete laves phase in interdendritic areas.

关键词： GTCA welding Inconel 718 alloy Magnetically constricted arc traverse speed Tensile properties Microstructure Laves phase

Experimental Investigation of Nonlinear Vibration Isolator with Fluidic Actuators (NLVIFA)

在线全文

学校读者我要写书评

暂无评论

Sound & Vibration 2019年第6期53卷 277-296页

作者： S.sivakumar L.Jayakumar Department of Automobile Engineering Arunai Engineering CollegeTiruvannamalai606603India Department of Mechanical Engineering Arunai Engineering CollegeTiruvannamalai606603India

This paper elaborates a nonlinear fluidic low frequency vibration isolator designed with the characteristics of quasi-zero stiffness(QZS).The existing model of QZS vibration isolator enhances amplitude of vibration and attenuating vibration *** concern with displacement plays a vital role in the performance and instability of oblique spring setup reduces the isolator performance in horizontal non-nominal loads,in this accordance;this paper associates double acting hydraulic cylinder(fluidic actuators in short)in oblique and helical coil *** approximate expression of unique analytical relationship between the stiffness of vertical spring and bulk modulus of the fluid is derived for Quasi–Zero Stiffness Non-Linear Vibration Isolator with Fluidic Actuators(NLVIFA in short)system and the force transmissibility is formulated and damping ratio are discussed for characteristic *** analysis carried out and compared with analytical results and an experimental prototype is developed and *** performance of the NLVIFA reduces the external embarrassment more at low frequencies and the series of experimental studies showing that the soft nonlinearity causes limitation in the resonant frequency thereupon the isolation will be enhanced and NLVIFA greatly outperform some other type of nonlinear isolators.

关键词： Quasi zero stiffness vibration nonlinear isolation fluidic actuator

SIMAP500: A novel risk score to identify recipients at higher risk of hepatocellular carcinoma recurrence following liver transplantation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Transplantation 2024年第3期14卷 132-143页

作者： Amr Alnagar Nekisa Zakeri Konstantinos Koilias Rosemary E Faulkes Rachel Brown Owen Cain M Thamara P R Perera Keith J Roberts Rebeca Sanabria-Mateos David C Bartlett Yuk Ting Ma Shivan sivakumar Shishir Shetty Tahir Shah Bobby V M Dasari Department of HBP and Liver Transplantation Surgery Queen Elizabeth HospitalUniversity Hospitals BirminghamBirmingham B152GWUnited Kingdom Centre for Liver Research Institute of Biomedical ResearchBirmingham B152TTUnited Kingdom Department of Hepatology Queen Elizabeth HospitalUniversity Hospitals BirminghamBirmingham B152GWUnited Kingdom Department of Pathology University Hospitals Birmingham NHS Foundation TrustBirmingham B152GWUnited Kingdom Department of Oncology Queen Elizabeth HospitalUniversity Hospitals of BirminghamBirmingham B152GWUnited Kingdom

BACKGROUND Recurrence of hepatocellular carcinoma(HCC)following liver transplantation(LT)has a devastating influence on recipients’survival;however,the risk of recur-rence is not routinely *** stratification is vital with a long LT waiting time,as that could influence the recurrence despite strict listing *** This study aims to identify predictors of recurrence and develop a novel risk pre-diction score to forecast HCC recurrence following *** A retrospective review of LT for HCC recipients at University Hospitals Bir-mingham between July 2011 and February *** and multivariate analyses were performed to identify recurrence predictors,based on which the novel SIMAP500(satellite nodules,increase in size,microvascular invasion,AFP>500,poor differentiation)risk score was *** 234 LTs for HCC were performed with a median follow-up of 5.3 *** developed in 25 patients(10.7%).On univariate analyses,RETREAT score>3,α-fetoprotein(AFP)at listing 100-500 and>500,bridging,increased tumour size between imaging at the listing time and explant histology,increase in the size of viable tumour between listing and explant,presence of satellite nodules,micro-and macrovascular invasion on explant and poor differentiation of tumours were significantly associated with recurrence,based on which,the SIMAP500 risk score is *** SIMAP500 demonstrated an excellent predictive ability(c-index=0.803)and outper-formed the RETREAT score(c-index=0.73).SIMAP500 is indicative of the time to disease *** SIMAP500 risk score identifies the LT recipients at risk of HCC *** stratification allows patient-centric post-transplant surveillance *** validation of the score is recommended.

关键词： Liver transplantation Hepatocellular carcinoma Recurrence Survival

Characterisation, Luminescence and Antibacterial Properties of Stable AgNPs Synthesised from AgCl by Precipitation Method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2015年第11期31卷 1125-1132页

作者： Arockiasamy Ajaypraveenkumar Johnson Henry Kannusamy Mohanraj Ganesan sivakumar Sankaran Umamaheswari Department of Physics Manonmaniam Sundaranar University Centralised Instrumentation and Service Laboratory Department of Physics Annamalai University Department of Biotechnology Manonmaniam Sundaranar University

Silver nanoparticles （AgNPs） were synthesised using equimolar concentrations of redtlcing agent vitamin C and AgCl precursor by simple precipitation method. The synthesised AgNPs were characterised by X-ray diffraction （XRD）, UV-Visible, photoluminescence and field emission scanning electron microscopy （FESEM） analysis. The formation of AgNPs was confirmed by the typical surface plasmon resonance band at 426 nm. The presence of elemental silver and pure crystalline face centre cubic （fcc） structure was confirmed by energy dispersive X-ray analysis and XRD analysis, respectively. The FESEM images showed the formation of spherical AgNPs for lower concentrations （0.1 and 0.3 mol/L） while spike and flower shaped particles were formed for higher concentration. Photoluminescence characteristic band was observed with no shift at 390 nm indicating the stable nature of AgNPs. The antibacterial property of the AgNPs was tested against gram negative bacteria Pseudomonas aeruginosa by using Cissus quadrangular as a control and the result showed that vitamin C reduced AgNPs have good antibacterial activity.

关键词： Silver nanoparticles Precipitation Rietveld refinement Photoluminescence spectroscopy Optical properties