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Handling higher order time series forecasting approach in intuitionistic fuzzy environment

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Journal of Control and Decision 2020年第4期7卷 327-344页

作者： Abhishekh sanjay kumar Department of Mathematics Institute of ScienceBanaras Hindu UniversityVaranasi 221005India

This study presents a new method of forecasting based on a higher order intuitionistic fuzzy time series(FTS)by transforming FTS data into intuitionistic FTS data via defining their appropriate membership and non-membership *** fuzzification of time series data is intuitionistic fuzzification which is based on the maximum score degree of intuitionistic fuzzy ***,the intuitionistic fuzzy logical relationship groups are defined and introduced into a defuzzification process for a higher order intuitionistic FTS that enhances in the forecasted *** order to assess the performance of the proposed method,the method has been implemented on the historical data of rice *** comparison result shows that the proposed method can achieve a better forecasting accuracy rate in terms of RMSE and MAPE than the existing methods such as Song and Chissom[(1993).Forecasting enrolments with fuzzy time series-Part *** Sets and System,54,1-9],Chen[(1996).Forecasting enrolments based on fuzzy time *** Sets and System,81,311-319],Singh[(2007a).A simple method of forecasting based on fuzzy time *** Mathematics and Computation,186,330-339]and Abhishekh,Gautam,and Singh[(2017).A refined weighted method for forecasting based on type 2 fuzzy time *** Journal of ModellingandSimulation,38,180-188;(2018).A score function based method of forecasting using intuitionistic fuzzy time *** Mathematics and Natural Computation,14(1),91-111].

关键词： Fuzzy time series intuitionistic fuzzy number membership grades accuracy function higher order IFLR

Quadrature Based Optimal Iterative Methods with Applications in High-Precision Computing

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Numerical Mathematics(Theory,Methods and Applications) 2012年第4期5卷 592-601页

作者： sanjay kumar Khattri Stord/Haugesund University College Department of EngineeringHaugesundNorway

We present a simple yet effective and applicable scheme,based on quadrature,for constructing optimal iterative *** to the,still unproved,Kung-Traub conjecture an optimal iterative method based on n+1 evaluations could achieve a maximum convergence order of *** quadrature,we develop optimal iterative methods of orders four and *** scheme can further be applied to develop iterative methods of even higher *** results demonstrate that the developed methods are efficient as compared with many well known methods.

关键词： Iterative methods fourth order eighth order quadrature Newton convergence nonlinear optimal

Adaptive Neuro Fuzzy Inference System Based Decoupled Control for Neutral Point Clamped Multi Level Inverter Fed Induction Motor Dri

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Chinese Journal of Electrical Engineering 2021年第2期7卷 70-82页

作者： Giribabu Dyanamina sanjay kumar Kakodia Department of Electrical Engineering Maulana Azad National Institute of TechnologyBhopalM.P 462003India

The presence of an integrator in a reference model of a rotor flux-based model reference adaptive system(RF-MRAS)and non-linearity of the inverter in the output voltage degrade the speed response of the sensorless operation of the electric drive system in terms of DC drift,initial value issues,and inaccurate voltage *** improve the speed response,a compensating voltage component is supplemented by an amending *** compensating voltage is a coalition of drift and offset voltages,and reduces DC drift and initial value *** low-speed operation,inaccurate voltage acquisition distorts the stator voltage critically,and it becomes considerable when the stator voltage of the machine is *** a three-level neutral point clamped inverter in speed-sensorless decoupled control of an induction motor improves the performance of the drive with superior quality of inverter output ***,the performance of the induction motor drive is improved by replacing the proportional-integral(PI)controller in the adaption mechanism of RF-MRAS with an adaptive neuro-fuzzy inference system(ANFIS)controller.A prototype model of the three-level neutral point clamped inverter(3L-NPC)-fed induction motor drive is fabricated in a laboratory,and its performance for a RF-MRAS,modified RFMRAS,and modified RFMRAS using ANFIS are compared using different benchmark tests.

关键词： Induction motor drive vector control neutral point clamped inverter model reference adaptive system ANFIS

Dynamic Behaviour of Pond Ash Mixed with Coir and Crumb Rubber

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Journal of Renewable Materials 2023年第3期11卷 1271-1291页

作者： Ashish Malik sanjay kumar Singh Civil Engineering Department Punjab Engineering College(Deemed to be University)Chandigarh160012India

An experimental program was conducted to determine the dynamic properties of pond ash(PA)and pond ash mixed with admixtures like crumb rubber(CR)and coir fiber(CF)which are wastes of different *** CR and CF were mixed separately with pond ash in a percentage ranging from 0%–20%at an interval of 5%and 0%–2%at an interval of 0.5%by weight of pond ash,*** properties(Shear modulus,Number of cycles to initiate liquefaction,Degradation index and Damping ratio)for pond ash mixes were determined using strain-controlled cyclic tri-axial *** shear strain was kept constant at 1.2%and the frequency varied from 0.4 to 1 *** resistance improves when crumb rubber is added to pond ash,however adding Coir fiber to pond ash has essentially no effect on the number of cycles required to initiate *** dynamic shear modulus decreases when crumb rubber was mixed in pond ash whereas when coir fiber is added to pond ash,the dynamic shear modulus increases significantly.A mix of PA,CR,and CF was also tried to balance the number of cycles required to initiate liquefaction and shear *** mixed sample in the proportion of PA(84%)+CR(15)+CF(1%)can be termed a balanced mix as the number of cycles to initiate liquefaction was more than all PA-CF mixes and also the shear modulus was more than all PA-CR *** ratio increases with increasing frequency of loading(0.4 to 1 Hz).

关键词： Pond ash coir crumb rubber cyclic loading liquefaction

Thermal performance and comfort assessment of U-shape and helical shape earth-air heat exchanger in India

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Energy and Built Environment 2022年第2期3卷 171-180页

作者： Anuj Mathur sanjay kumar Mechanical Engineering Department Global Institute of TechnologyJaipur 302022India Mechanical Engineering Department Dr.B R Ambedkar National Institute of TechnologyJalandhar 144011India

Earth Air Tunnel Heat Exchanger(EATHE)systems are not so much popular in India because of restricted acces-sibility of ground space in majority of residential and commercial *** the present article,thermal perfor-mance of newly designed helical shaped EATHE system has been compared with conventional U-shaped EATHE system by keeping similar geometrical and operational configuration for the summer(April-June)and winter(December-February),*** this regard,therefore,numerical model of both EATHE systems have been designed and experimentally *** thermal performance of both EATHE systems has been compared in terms of outlet air temperature and *** present numerical study suggested that the newly designed helical EATHE system exhibits better thermal performance with lower ground requirement as compared to con-ventional U-shaped EATHE *** evaluate the thermal comfort potential of EATHE system in office buildings of India,composite climate specific adaptive thermal comfort boundaries has been *** detailed thermal performance behaviour of the EATHE system suggests that an additional 80%of the time;ambient air condi-tions became thermally comfortable during peak summer *** addition,analysis of the results revealed that EATHE system has more potential during heating operation mode to maintain indoor comfort in winter season of composite climate in India.

关键词： EATHE system U-shaped EATHE Helical EATHE Thermal comfort Summer cooling Winter heating

Swallowing of Casson fluid in oesophagus under the influence of peristaltic waves of varying amplitude

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International Journal of Biomathematics 2017年第2期10卷 49-64页

作者： sanjay kumar Pandey Shailendra kumar Tiwarit Indian Institute of Technology (BHU) Varanasi 221005 India

The experimentally verified fact that there is a high pressure zone in the lower part of the oesophagus has established that the earlier models fall short of representing the realistic swallowing process in the oesophagus. Since the high pressure is created by gradually increasing amplitudes of peristaltic waves, swallowing of Casson fluid in oesophagus is mathematically remodeled. It is revealed that in the case of exponentially increasing amplitude, pressure is non-uniformly distributed for different cycles. Pressure increases along the entire length of the oesophagus; and finally toward the end of the oesophageal flow, it increases quite significantly, probably to ensure delivery into the stomach. This is a similar observation for Newtonian as well as non-Newtonian fluids but Casson fluids need more pressure; and hence more efforts are required by the oesophagus to transport the fluid forward. When wave amplitude is small, flow rates are small. In such a case, Casson fluid requires higher flow rates for reflux to occur in comparison to Newtonian fluid. This tendency gradually diminishes with increasing amplitude. For a particular value of amplitude, there is no difference; and beyond that the trends are quite opposite. Thus, Casson fluid is found to be less prone to reflux near the wall. It is also concluded that for the Newtonian fluid as well as for the non-Newtonian Casson fluid, reflux is more likely to occur with increasing amplitude and it is further augmented by the addition of amplifying parameter.

关键词： Oesophagus peristalsis varying amplitude Casson fluid.

A Comparative Assessment of Temperature Data from Different Sources for Dehradun, Uttarakhand, India

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Journal of Meteorological Research 2016年第6期30卷 1019-1032页

作者： Atul Kant PIYOOSH sanjay kumar GHOSH Department of Civil Engineering Indian Institute of Technology Roorkee

A comparative study of extreme temperature parameters from different sources is carried out by examining standardized anomalies, trends, correlation, and equivalence of datasets. Maximum temperature （Tmax） and minimum temperature （Wmln） for Dehradun, from two different sources such as computed and gridded data from Climatic Research Unit （CRU） and observed data from India Meteorological Department （IMD） are used for 1901-2012. The CRU data are compared initially with IMD, by graphical assessment of standardized anomalies. Subsequently, change points are identified by using Cumulative Sum （CUSUM）-chart technique for trend analysis. The magnitude and significance of trends are determined by applying Sen＇s slope test, and on the basis of these, trends are compared. Further, correlation analysis is carried out and datasets are tested for equivalence by using Wileoxon-Mann Whitney test. The result shows that annual standardized anomalies of CRU data follow the pattern of annual standardized anomalies of IMD data. The CRU data exhibit similar trends and are well correlated with IMD dataset. Moreover, CRU anomaly data are identical with IMD anomaly data in the recent decades. High resolution gridded CRU data have open access and may be more useful due to its spatio-temporal continuity for land areas of the world.

关键词： cumulative sum Sen's slope temperature trend temperature anomaly correlation Wilcoxon Mann-Whitney test

Order Bounded Weighted Composition Operators Mapping into the Dirichlet Type Spaces

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Chinese Annals of Mathematics,Series B 2016年第4期37卷 585-594页

作者： Yongxin GAO sanjay kumar Zehua ZHOU Department of Mathematics Tianjin UniversityTianjin 300072China. Department of Mathematics Central University of JammuINDIA. Center for Applied Mathematics Tianjin UniversityTianjin 300072China.

The authors characterize the order boundedness of weighted composition operators acting between Dirichlet type spaces.

关键词： Weighted composition operator Order boundedness Dirichlet typespaces Positive Borel measure

Experimental study on repeatedly loaded foundation soil strengthened by wraparound geosynthetic reinforcement technique

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第4期13卷 899-911页

作者： Muhammad Nouman Amjad Raja sanjay kumar Shukla Geotechnical and Geoenvironmental Engineering Research Group School of EngineeringEdith Cowan UniversityJoondalupPerthWA 6027Australia Department of Civil Engineering School of EngineeringUniversity of Management and TechnologyLahorePakistan Civil Engineering Department Delhi Technological UniversityDelhiIndia

In the recent past,the potential benefits of wraparound geosynthetic reinforcement technique for constructing the reinforced soil foundations have been *** paper presents the experimental study on the behaviour of model strip footing resting on sandy soil bed reinforced with geosynthetic in wraparound and planar forms under monotonic and repeated *** geosynthetic layers were laid according to the reinforcement ratio to minimise the scale *** is found that for the same amount of reinforcement material,the wraparound reinforced model resulted in less settlement in comparison to planar reinforced *** efficiency of wraparound reinforced model increased with the increase in load amplitude and the rate of total cumulative settlement substantially decreased with the increase in number of load *** wraparound reinforced model has shown about 45% lower average total settlement in comparison to unreinforced model,while the double-layer reinforced model has about 41% lower average total settlement at the cost of approximately twice the material and 1.5 times the occupied land width ***,wraparound models have shown much greater stability in comparison to their counterpart models when subjected to incremental repeated loading.

关键词： Geosynthetics Repeated loads Wraparound reinforcement technique Model tests Footing settlement Bearing capacity Reinforcement ratio Strip footing