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A novel SARMA-ANN hybrid model for global solar radiation forecasting
Srivastava, Rachit,Tiwaria, A.N.,Giri, V.K. Techno-Press 2019 Advances in energy research Vol.6 No.2
Global Solar Radiation (GSR) is the key element for performance estimation of any Solar Power Plant (SPP). Its forecasting may help in estimation of power production from a SPP well in advance, and may also render help in optimal use of this power. Seasonal Auto-Regressive Moving Average (SARMA) and Artificial Neural Network (ANN) models are combined in order to develop a hybrid model (SARMA-ANN) conceiving the characteristics of both linear and non-linear prediction models. This developed model has been used for prediction of GSR at Gorakhpur, situated in the northern region of India. The proposed model is beneficial for the univariate forecasting. Along with this model, we have also used Auto-Regressive Moving Average (ARMA), SARMA, ANN based models for 1 - 6 day-ahead forecasting of GSR on hourly basis. It has been found that the proposed model presents least RMSE (Root Mean Square Error) and produces best forecasting results among all the models considered in the present study. As an application, the comparison between the forecasted one and the energy produced by the grid connected PV plant installed on the parking stands of the University shows the superiority of the proposed model.
A. Giri,M. M. Mahapatra,K. Sharma,P. K. Singh 한국강구조학회 2017 International Journal of Steel Structures Vol.17 No.1
Present research describes the effect of weld groove designs on residual stresses of thick SS 304LN pipe welds which are commonly utilized for applications such as boiling water reactor system, oil and steam piping. The faying surfaces of the pipe joints were machined to generate conventional and narrow groove geometries for welding. Circumferential multipass pipe welding was carried out without applying preheat and post weld heat treatment. Blind hole drilling technique was employed for measuring hoop and axial residual stresses in narrow and conventional grooved SS 304LN pipe welds considering plasticity and stress concentration effects of hole drilling process. The result exhibited 20 to 30 percent reduction in residual stresses in narrow grooved pipe welds. A finite element model was developed for estimating the pass by pass peak temperature distributions in the pipe welds. Sequentially coupled thermomechanical elastic-plastic analysis of both conventional and narrow groove pipe welds indicated close agreement between the predicted and experimentally determined hoop and axial residual stresses.
( Shruti Shastri ),( A. K. Giri ),( Geetilaxmi Mohapatra ) 한양대학교 경제연구소 2017 JOURNAL OF ECONOMIC RESEARCH Vol.22 No.2
The paper examines the twin deficit hypothesis for a panel of eight South Asian and South East Asian economies having a history of persistent deficits on both fiscal and current accounts for the peri-od 1985-2014. The results based on first and second generation pan-el cointegration tests indicate existence of a long-run relationship among budget balance, interest rate, exchange rate and current ac-count balance. The estimates of long run coefficients obtained from common correlated effects mean group indicate a positive relation-ship between the two balances, the impact of the budget balance on the current account being stronger. Dumitrescu-Hurlin panel cau-sality and block exogeniety tests suggest a feedback relationship between the two balances. The conventional hypothesis of causation running from budget balance to interest rates, to exchange rates and then to current account balance is however not borne out by the results.
Shruti Shastri,A K Giri,Geetilaxmi Mohapatra 한양대학교 경제연구소 2017 JOURNAL OF ECONOMIC RESEARCH Vol.22 No.1
The paper examines the twin deficit hypothesis for a panel of eight South Asian and South East Asian economies having a history of persistent deficits on both fiscal and current accounts for the period 1985-2014. The results based on first and second generation panel cointegration tests indicate existence of a long-run relationship among budget balance, interest rate, exchange rate and current account balance. The estimates of long run coefficients obtained from common correlated effects mean group indicate a positive relationship between the two balances, the impact of the budget balance on the current account being stronger. Dumitrescu-Hurlin panel causality and block exogeniety tests suggest a feedback relationship between the two balances. The conventional hypothesis of causation running from budget balance to interest rates, to exchange rates and then to current account balance is however not borne out by the results.
Seasonal PM<sub>10</sub> dynamics in Kathmandu Valley
Aryal, R.K.,Lee, B.K.,Karki, R.,Gurung, A.,Kandasamy, J.,Pathak, B.K.,Sharma, S.,Giri, N. Pergamon Press ; Elsevier [distribution] 2008 Atmospheric environment Vol.42 No.37
Data on ambient PM<SUB>10</SUB> levels from six locations in the Kathmandu Valley recorded by means of continuous sampling using low volume air samplers from October 2002 to March 2007 were used to investigate PM<SUB>10</SUB> concentration dynamics in the valley. Monthly average data of the urban areas, which have much higher concentrations than the rural areas, even exceeded the daily standard level of PM<SUB>10</SUB>, in Nepal, 120μmm<SUP>-3</SUP>. Repetitive peaks and troughs each year indicated annual patterns. Monthly average showed seasonal patterns are different between rural area and urban sites. The highest monthly average concentration was observed in February, the end of winter in urban areas where as in rural found in spring, and the lowest concentration was observed in July (monsoon period). The continuous increase in PM<SUB>10</SUB> concentration from December to February in urban areas showed accumulation of PM<SUB>10</SUB> in the ambient air during the wintertime. Rainfall in June and September, during the monsoon period, caused a PM<SUB>10</SUB> concentration decrease, demonstrating that precipitation is effective in removing PM<SUB>10</SUB> from the valley. Cross correlation analyses among the PM<SUB>10</SUB> levels measured simultaneously at the sampling stations showed a poor relationship in winter; however, there were good relationships in the monsoon and post-monsoon seasons. Both the PM<SUB>10</SUB> concentration and the air-mixing environment in the valley were closely associated with the temperature and wind speed.
s -wave scattering lengths for the Be7+p system from an R -matrix analysis
Paneru, S. N.,Brune, C. R.,Giri, R.,Livesay, R. J.,Greife, U.,Blackmon, J. C.,Bardayan, D. W.,Chipps, K. A.,Davids, B.,Connolly, D. S.,Chae, K. Y.,Champagne, A. E.,Deibel, C.,Jones, K. L.,Johnson, M. American Physical Society 2019 Physical Review C Vol.99 No.4
( Geetilaxmi Mohapatra ),( A K Giri ) 한양대학교 경제연구소 2016 JOURNAL OF ECONOMIC RESEARCH Vol.21 No.2
The present study examines the role of various components of public expenditures on economic growth in India during the period from 1980 to 2013. The study used ARDL approach to examine the long run and the short run dynamic relationship. The VECM based Granger causality test is utilized to check the direction of causality. The results reveal that there exists a long run cointegrating relationship between economic growth, developmental expenditure, fiscal deficit and gross private investment. The ARDL estimates show significant positive long run impact of development expenditure on economic growth. However, the non development expenditure and revenue expenditure reveal insignificant impact on economic growth. The causality test estimates indicate short and long run unidirectional causality running from development expenditure and fiscal deficit to economic growth in India.