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2022 ◽  
pp. 1-11
Author(s):  
Hooshang Kheirollahi ◽  
Mahfouz Rostamzadeh ◽  
Soran Marzang

Classic data envelopment analysis (DEA) is a linear programming method for evaluating the relative efficiency of decision making units (DMUs) that uses multiple inputs to produce multiple outputs. In the classic DEA model inputs and outputs of DMUs are deterministic, while in the real world, are often fuzzy, random, or fuzzy-random. Many researchers have proposed different approaches to evaluate the relative efficiency with fuzzy and random data in DEA. In many studies, the most productive scale size (mpss) of decision making units has been estimated with fuzzy and random inputs and outputs. Also, the concept of fuzzy random variable is used in the DEA literature to describe events or occurrences in which fuzzy and random changes occur simultaneously. This paper has proposed the fuzzy stochastic DEA model to assess the most productive scale size of DMUs that produce multiple fuzzy random outputs using multiple fuzzy random inputs with respect to the possibility-probability constraints. For solving the fuzzy stochastic DEA model, we obtained a nonlinear deterministic equivalent for the probability constraints using chance constrained programming approaches (CCP). Then, using the possibility theory the possibilities of fuzzy events transformed to the deterministic equivalents with definite data. In the final section, the fuzzy stochastic DEA model, proposed model, has been used to evaluate the most productive scale size of sixteen Iranian hospitals with four fuzzy random inputs and two fuzzy random outputs with symmetrical triangular membership functions.


MAUSAM ◽  
2021 ◽  
Vol 64 (2) ◽  
pp. 363-370
Author(s):  
M.I. ANSARI ◽  
S.K. KUNDU ◽  
K.C. SAIKRISHNAN ◽  
RANJU MADAN

jsfM;ksa  rjax ds lapj.k dks izHkkfor djus esa jsfM;ks viorZdrk ,d egRoiw.kZ dkjd dk dk;Z djrh gSA jsfM;ks viorZdrk] ok;qeaMy dh HkkSfrd voLFkkvksa tSls & rkieku] nkc vkSj vknzZrk ij fuHkZj djrh gSA jsMkj vR;Ur NksVh vk—fr ds viorZukad fHkUurkvksa tks jsMkj ds rjax nS/;Z dh vk/kh gksrh gS] ds izfr laosnh gksrs gSA i'p izdh.kZu 'kfDr viorZukad fu;rkad Cn2 dh vk—fr ds ifjek.k ij fuHkZj djrh gSA vr% ekSle jsMkj] fo’k"k :i  foaM izksQkbyj jsMkj ds fM+tkbu ds fy, fdlh LFkku ds Cn2 ds eku mi;ksxh gksrs gSA bl 'kks/k i= esa fnYyh ds Åij ds mijhru ok;qeaMy esa ok;qeaMyh; viorZukad fu;rkad Cn2 dh :ijs[kk nSfud ,oa _rqvksa ds vk/kkj ij rS;kj djus dh dksf’k’k dh xbZ gSA The radio refractivity is an important factor which effects radio wave propagation. Radio refractivity depends upon the physical states of atmosphere, i.e., its temperature, pressure and humidity. Radars are sensitive to refractive index irregularities on scale size equal to half wavelength of Radar. Backscattered power is dependent on the magnitude of refractive index structure constant Cn2.  Hence Cn2values of a place are useful for designing weather radar specially wind profiler radars. This paper is an attempt to map the profile of refractive index structure constant Cn2 of atmosphere in the upper atmosphere, over Delhi on diurnal and seasonal basis.


Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1541
Author(s):  
Bhupendra Kumar Singh ◽  
Yongseok Kim ◽  
Seungdon Kwon ◽  
Kyungsu Na

Currently, zeolites are one of the most important classes of heterogeneous catalysts in chemical industries owing to their unique structural characteristics such as molecular-scale size/shape-selectivity, heterogenized single catalytic sites in the framework, and excellent stability in harsh industrial processes. However, the microporous structure of conventional zeolite materials limits their applications to small-molecule reactions. To alleviate this problem, mesoporous zeolitic frameworks were developed. In the last few decades, several methods have been developed for the synthesis of mesoporous zeolites; these zeolites have demonstrated greater lifetime and better performance than their bulk microporous counterparts in many catalytic processes, which can be explained by the rapid diffusion of reactant species into the zeolite framework and facile accessibility to bulky molecules through the mesopores. Mesoporous zeolites provide versatile opportunities not only in conventional chemical industries but also in emerging catalysis fields. This review presents many state-of-the-art mesoporous zeolites, discusses various strategies for their synthesis, and details their contributions to catalytic reactions including catalytic cracking, isomerization, alkylation and acylation, alternative fuel synthesis via methanol-to-hydrocarbon (MTH) and Fischer–Tropsch synthesis (FTS) routes, and different fine-chemical syntheses.


2021 ◽  
pp. 68-87
Author(s):  
Mark Wilson

Hertz and his scientific contemporaries correctly viewed conceptual disharmony as the inevitable product of the evolutionary manner in which an initial descriptive practice gradually enlarges its applicational outreach, pragmatically guided by the discovery of fresh opportunities for calculating results in a useful manner. As a side effect of this increasing accumulation of technique, component words will become naturally pulled into subtly different forms of localized referential attachment. These discordant alignments create difficulties when a straightforward exposition of “fundamental principle” is wanted, as arises within an elementary class in classical mechanics (this is the “mystery” of the chapter’s title). Hertz, in particular, noticed that the word “force” behaves in a diverging manner, according to the comparative scale size of the object under consideration. This structural insight is crucial to unraveling the resulting conceptual tensions, but the axiomatic corrective that Hertz proposed leads to very unfortunate results, because such a scheme must artificially choose which of these usages of “force” should be favored as “primary.” Nonetheless, Hertz’s faulty presumption that axiomatics represents the proper vehicle for rectifying conceptual tangles of this character has turned into a widely accepted methodological dogma. It constitutes the foundational basis of the theory T thinking of which this book complains. Again the finer details outlined in this chapter are not essential for following the main argument of this work, but they nicely illuminate its motivational background.


Author(s):  
Shuai Zhang ◽  
I. Jonathan Rae ◽  
Clare E. J. Watt ◽  
Alexander W. Degeling ◽  
Anmin Tian ◽  
...  
Keyword(s):  

Author(s):  
Shivangi Kaushal ◽  
Ashima Narang ◽  
Nishu Sethi ◽  
Neha Bhateja

Goods and Services Tax (GST) Accounting and Billing System is arguably one of the most complex Information Technology (IT) Systems in the world – in terms of scale, size, and complexity. Under Goods and Services Tax, the returns of the buyer’s will be auto filled by data from the returns done by sellers and invoices uploaded by him/her. The software will have to match the data automatically from the returns and uploaded invoices and accept/deny/modify these invoices. The uploading of duplicate invoice is not allowed by the Goods and Services Tax system. All payments, uploading of invoices and filing of returns will have to be done electronically by all taxpayers only through the Goods and Services Tax portal. Access to and use of technology is therefore crucial for all taxpayers registered with the Goods and Services Tax Network, without which they cannot conduct business. This paper intents a proper invoice generation through the software and application that will be uploaded on the Goods and Services Tax Portal for filing Income Tax Returns.


2021 ◽  
Vol 4 (1) ◽  
pp. 176-184
Author(s):  
IJ DIKE

This study analyzes the performance efficiency of six selected banks in Nigeria for the period 2010 – 2016. DEA window analysis was employed to establish the performance efficiency of the selected banks. The analysis is based on panel data for the period under review. The result of the DEA window analysis for the reviewed period showed that the average efficiency scores under constant returns to scale ranged from 84% to 91%. Under the variable returns to scale, the average efficiency scores ranged from 91% to 95%. The average inefficiency of the selected Nigeria commercial banks under the constant returns to scale model was in the range 9 – 16%. This inefficiency could be attributed to the excess of customers deposits on the balance sheet of the selected banks. The average scale efficiency for the banks was 93%. Guaranty Trust Bank was the most efficient bank on all measures. United Bank for Africa was the most inefficient bank under constant returns to scale and variable returns to scale. It was however, more scale efficient than three other banks, an indication that its inefficiency cannot be attributed to inappropriate scale size.


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