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Open Access Article
1 - Continuity of almost multipliers on Banach algebras
Mohammad Reza Omidi Abbas zivari-kazempour Abasalt Bodaghi: In this paper, we prove that every multipliers on without order Banach algebra A is almost homomorophisms. Also we investigate the continuity of approximate multipliers and under special hypothesis we show that each approximate multiplier T:A⟶A is continuous.: In this More: In this paper, we prove that every multipliers on without order Banach algebra A is almost homomorophisms. Also we investigate the continuity of approximate multipliers and under special hypothesis we show that each approximate multiplier T:A⟶A is continuous.: In this paper, we prove that every multipliers on without order Banach algebra A is almost homomorophisms. Also we investigate the continuity of approximate multipliers and under special hypothesis we show that each approximate multiplier T:A⟶A is continuous.: In this paper, we prove that every multipliers on without order Banach algebra A is almost homomorophisms. Also we investigate the continuity of approximate multipliers and under special hypothesis we show that each approximate multiplier T:A⟶A is continuous.: In this paper, we prove that every multipliers on without order Banach algebra A is almost homomorophisms. Also we investigate the continuity of approximate multipliers and under special hypothesis we show that each approximate multiplier T:A⟶A is continuous. Manuscript profile -
Open Access Article
2 - K-Frame of multipliers in Hilbert pro-C*-module
Mona Naroei Irani Akbar Nazariabstract‎For the study of atomic systems, first introduced by Feichtinger et al. Gavruta presented K-frames on Hilbert spaces. K-frames are a kind of frames in sense that the lower frame bound only holds for the elements in the range of the K, where K is a bounded l Moreabstract‎For the study of atomic systems, first introduced by Feichtinger et al. Gavruta presented K-frames on Hilbert spaces. K-frames are a kind of frames in sense that the lower frame bound only holds for the elements in the range of the K, where K is a bounded linear operator in Hilbert space. C*-algebra whose topology is induced by a family of continuous C*-seminorms instead of a C*-norm is called pro-C*-algebra. Hilbert pro-C*-modules are generalizations of Hilbert spaces by allowing the inner product to take values in a pro-C*-algebra rather than in the field of complex numbers. In this paper, the sequences whose elements are adjointable operators from pro-C*-algebra into Hilbert pro-C*-module is called the sequence of multipliers. We introduce the concept atomic systems and K-frame of multipliers in Hilbert pro-C*-modules and for more information, we give an example of K-frames. We obtain a condition that sequences of multipliers is frame, also we investigate the relationship between atomic systems and K-frames with each other and the frame of multipliers. If K is a bounded operator with certain conditions then every K-frame of multipliers is a frame of multipliers in Hilbert pro-C*-module. Also, we investigate some of the properties of these concepts, such as the combination of operators with K-frames in Hilbert pro-C*-module. Manuscript profile -
Open Access Article
3 - BSE property of the completion of Fourier algebra in its multiplier algebra
Mohammad FozouniFor a locally compact group G, let A(G) be the Fourier algebra and let A_M (G) be the completion of this algebra in its multiplier algebra. In this paper, we show that A(G) is an abstract Segal algebra in A_M (G). Also, a necessary and sufficient condition for equality MoreFor a locally compact group G, let A(G) be the Fourier algebra and let A_M (G) be the completion of this algebra in its multiplier algebra. In this paper, we show that A(G) is an abstract Segal algebra in A_M (G). Also, a necessary and sufficient condition for equality of these two algebras is given. Then we prove that A_M (G) is an ideal in its second dual if and only if G is discrete. We show that if G is a discrete group, then A_M (G) is a BSE algebra if and only if G is M-weakly amenable. As a corollary, it is proven that A_M (F_2 ) is a BSE algebra while A(F_2 ) is not. Finally, we examine our results for the Lebasque-Fourier algebra and also give a completely new proof for equality of the character space of A(G) and A_M (G).Keywords: Banach algebra, Fourier algebra, Multiplier algebra, BSE property, Locally compact group. Manuscript profile -
Open Access Article
4 - MULTIPLIERS AND THEIR APPLICATIONS IN EARTHQUAKE ENGINEERING
M. AdibIn this paper we shall study the multipliers on Banach algebras and We prove some results concerning Arens regularity and amenability of the Banach algebra M(A) of all multipliers on a given Banach algebra A. We also show that, under special hypotheses, each Jordan mult MoreIn this paper we shall study the multipliers on Banach algebras and We prove some results concerning Arens regularity and amenability of the Banach algebra M(A) of all multipliers on a given Banach algebra A. We also show that, under special hypotheses, each Jordan multiplier on a Banach algebra without order is a multiplier. Finally, we present some applications of multipliers in signal theory, and in particular in earthquake engineering. Manuscript profile -
Open Access Article
5 - Evaluating Efficiency by Multiplier Method in Two-Stage Unit with Undesirable Outputs
Sepideh Vatani -
Open Access Article
6 - Bessel multipliers on the tensor product of Hilbert $C^\ast-$ modules
M. Mirzaee ‎Azandaryani -
Open Access Article
7 - On solving ordinary differential equations of the first order by updating the Lagrange multiplier in variational iteration method
SH. Javadi -
Open Access Article
8 - A Multiplier-Less Discrete Cosine Transform Architecture Using a Majority Logic-Based Approximate Full Adder
Elham Esmaeili Farshad Pesaran Nabiollah ShiriThis paper proposes a new approximate full adder (FA) based on the majority logic (ML) concept. The fundamental structure of the ML concept is a 3-input majority voter and is widely utilized in digital arithmetic cells. The ML-based proposed FA works at low power, small MoreThis paper proposes a new approximate full adder (FA) based on the majority logic (ML) concept. The fundamental structure of the ML concept is a 3-input majority voter and is widely utilized in digital arithmetic cells. The ML-based proposed FA works at low power, small delay, and low power-delay-product (PDP). The carbon nanotube field-effect transistor (CNTFET) technology lowers the FA power, while the gate diffusion input (GDI) technique is used as the main technique. The swing issue of the GDI technique is resolved by the dynamic threshold (DT) technique. Compared with its exact circuit, the proposed FA saves 2 majority gates, 3 inverters, and a 4.02 ns delay. In the proposed FA, the PDP is improved by 53.73%. The product of the PDP and the normalized mean error distance (NMED) is called PDPE, and in the presented FA, it is reduced by 9.50%. Moreover, the proposed FA is embedded into a multiplier-less discrete cosine transform (DCT) design, which is an appropriate circuit for very large-scale integration (VLSI) systems. The 8-input DCT architecture consumed 2.2321 mW of power for each DCT operation. Also, the circuit has better performance in terms of PDP-area-product (PDAP). The results of DCT implementations confirm the efficiency of the FA. Manuscript profile -
Open Access Article
9 - Analysis and study of four-quadratic analog current mode multipliers in terms of linearity and overall harmonic distortion
Hamid Bashi Seyed Ali Hosseini Abolfazl Amiri Analog multiplication of two signals is one of the most important applications in signal processing. The main motivation for choosing an analog current multiplier is its importance in the function of nonlinear analog signal processing. The multiplier is used as a More Analog multiplication of two signals is one of the most important applications in signal processing. The main motivation for choosing an analog current multiplier is its importance in the function of nonlinear analog signal processing. The multiplier is used as a programming element in systems such as filters, neural networks, and as mixers and modulators in a telecommunications system. And are widely used in end-of-life frequency modulation conversion control filters for fuzzy integrated systems and so on. Quadruple multiplication has a non-linear function in signal processing that is very useful for communication equipment and control systems, and CMOS technology is widely recognized as the most desirable technology for implementing integrated circuits. Therefore, comparison and evaluation of current quadruple multipliers in terms of power consumption, total THD harmonic distortion, frequency response, linearity, speed, input voltage range, input current range, noise, power supply, and other parameters affecting quadruple current multiplier circuits are necessary to achieve a multiplier with proper performance and use in specific applications. Manuscript profile -
Open Access Article
10 - Quadruple analog multiplier with high-frequency response
Hamid Bashi Seyed Hadi Mosavi Abolfazl AmiriField Effect Carbon Nanotube Transistor (CNFET) is a promising and new technology that overcomes the traditional limitations of integrated silicon circuit technology. In recent years, the potential of CNFET for analog circuit applications has been exploited. This paper MoreField Effect Carbon Nanotube Transistor (CNFET) is a promising and new technology that overcomes the traditional limitations of integrated silicon circuit technology. In recent years, the potential of CNFET for analog circuit applications has been exploited. This paper presents a quadratic analog multiplier using CNFETs. designed. The simulation-based on 32nm CNFET technology shows that the multiplier has very low harmonic distortion (less than 0.45%), large input range (±400 mv), high bandwidth (50 ~ GHz) and low power consumption (247 ~ μW), in While at the supply voltage it is ±0.9 volts. Manuscript profile -
Open Access Article
11 - Simulation and investigation of parameters affecting the reduction of power consumption in multiplication circuits using CNT transistor technology
abdolrasoul moghateli hosssein momenzadeh Mohammad Nader KakaiAnalog multipliers are useful blocks used in implementing functions such as automatic control, modulation, detectors, adaptive filters, and neural networks. In this paper, we present a new four-quadratic analog multiplier based on carbon nanotube transistors. Newly desi MoreAnalog multipliers are useful blocks used in implementing functions such as automatic control, modulation, detectors, adaptive filters, and neural networks. In this paper, we present a new four-quadratic analog multiplier based on carbon nanotube transistors. Newly designed current square circuits and a current mirror, all operating at low voltage (1V), are essential components in realizing mathematical equations. The multiplier circuit is designed using CNTFET technology, 32 nm, and the multiplier provided in the HSPICE simulator is simulated to validate the circuit performance. The simulation results showed that the circuit has the desired performance up to a frequency of 2 GHz and shows a maximum power consumption of 3.7464uw and also has a THD of 0.226043%. Manuscript profile -
Open Access Article
12 - Analysis and Design of a High Performance Radix-4 Booth Scheme in CMOS Technology
Ali Rahnamaei -
Open Access Article
13 - The Charging Circuit of the Energy Storage System of the Multi-Input Converter with High Gain (Design, Simulation and Laboratory Investigation)
Donya Taheri Ghazanfar Shahgholian Mohammad Mehdi MirtalaeiIn this article, a multi-input non-isolated converter topology with high gain is proposed for clean energy applications that require an energy storage system. The techniques of voltage multiplier cell and coupling inductor have been used to design the circuit, and by co MoreIn this article, a multi-input non-isolated converter topology with high gain is proposed for clean energy applications that require an energy storage system. The techniques of voltage multiplier cell and coupling inductor have been used to design the circuit, and by combining them, it is possible to use switches with low voltage stress and as a result, low conductivity. The charging performance of the energy storage system is explained and the structure and performance of the proposed converter are investigated for the design of a non-isolated multi-input converter with high voltage gain. The precise design method for the correct operation of the converter is presented and the simulation results of the converter performance are shown. Finally, in order to verify the accuracy of the results obtained from the simulation of the proposed converter, a laboratory sample has been made and a comparison has been made between the results. Manuscript profile -
Open Access Article
14 - Design and Dynamic Modeling of Planar Parallel Micro-Positioning Platform Mechanism with Flexible Links Based on Euler Bernoulli Beam Theory
N.S Viliani H Zohoor M.H Kargarnovin -
Open Access Article
15 - Application of variational iteration method for solving singular two point boundary value problems
Shadan Sadigh BehzadiIn this paper, He's highly prolic variational iteration method is applied ef-fectively for showing the existence, uniqueness and solving a class of singularsecond order two point boundary value problems. The process of nding solu-tion involves generation of a sequence MoreIn this paper, He's highly prolic variational iteration method is applied ef-fectively for showing the existence, uniqueness and solving a class of singularsecond order two point boundary value problems. The process of nding solu-tion involves generation of a sequence of appropriate and approximate iterativesolution function equally likely to converge to the exact solution of the givenproblem which being processed out and improvised on its own at every step re-cursively. Moreover, Illustrative examples available to the context in literaturewhen treated with, by application of such proposed method fetch encouragingresults so as to justify and reveal its eciency and usefulness of the method. Manuscript profile -
Open Access Article
16 - Development of a Network Data Envelopment Analysis (NDEA) model for investigation of the internal structure of decision-making units
Reza Soleymani-DamanehData envelopment analysis has been in the center of attention due to independency of the production function. But the initial models of data envelopment analysis are incapable of examining the internal structure of the units and have a black-box view. One of the most co MoreData envelopment analysis has been in the center of attention due to independency of the production function. But the initial models of data envelopment analysis are incapable of examining the internal structure of the units and have a black-box view. One of the most common network structures is consecutive two-staged structure. Available models for evaluating this structure are mainly based on the decomposition approach, in other words, their priority is overall efficiency, and the efficiency of the stages is obtained by decomposing the total efficiency. In this paper, an attempt is made to develop a multivariate model that simultaneously considers the overall efficiency and efficiency of the stages. In addition, for multi-response mode, the models were developed to calculate the efficiencies and it was proved that in all models, efficiency scores range from zero to one, and a unit is efficient if only it is efficient in both stages. The presented models were used in an applied example and the results showed that the existing model performed more realistic evaluation than traditional models. Manuscript profile -
Open Access Article
17 - Solution to “the Kuznets Riddle”
Ihor Skvortsov Olena Zahoretska Oksana Musiiovska Anatolii Havryliak -
Open Access Article
18 - state dependent values of tax multiplier in iran
negin heidarizadeh sayed.yahya abtahi zohreh tabatabaeinasab mohamadali dehghantaftiChanges in taxes under different conditions of output growth can have completely different macroeconomic effects, and in this regard, some empirical evidence emphasizes the non-linearity and state-dependent effects of fiscal policy. This paper examines the state-depende MoreChanges in taxes under different conditions of output growth can have completely different macroeconomic effects, and in this regard, some empirical evidence emphasizes the non-linearity and state-dependent effects of fiscal policy. This paper examines the state-dependent behavior of tax multiplier in Iran. Accordingly, a threshold model of specification presented by Romer and Romer (2010) is used to examine the coefficients related to the status of tax revenues to examine the effects of fiscal policies on output in the Iranian economy. The results of this study using quarterly data 1369: 02- 1398: 04 show that tax multiplier in low and medium regimes of economic growth is not significant. But the rising tax multiplier in a high-growth regime is quite significant. Also, increasing tax multiplier coefficients become smaller in periods of low economic growth, and these coefficients become larger in periods of high growth than in the entire sample period. Thus, tax policies in good times are quite effective tools, and the results emphasize the role of tax policies as a stabilizing tool by using the "right tool" at the "right time". Thus, although tax policies do not play an effective role during a recession, they can become a very effective tool for stabilizing and sustaining economic growth during a boom. Manuscript profile -
Open Access Article
19 - Calculation of Backward and Forward linkages of Mineral of Iran's Mines (Application of Input-Output Approach)
mirhosein mousavi farid dehghani azadeh roshanravanAbstract The purpose of this study is to rank the minerals of mines in operation in Iran by examining the backward and forward linkages between sections. For this purpose, the input-output table updated in2011 by the Islamic Parliament Research Center of The Islamic Re MoreAbstract The purpose of this study is to rank the minerals of mines in operation in Iran by examining the backward and forward linkages between sections. For this purpose, the input-output table updated in2011 by the Islamic Parliament Research Center of The Islamic Republic Of Iran has been used. By calculating the multiplier coefficient of production, using Leontief's demand-side method, all mining sections had a multiplier coefficient of production more than one. Also, by calculating the backward linkage using a supply-side model of Gosh, the multiplier coefficient of supply in all mineral sectors is high. By examining the power index through Rasmussen's demand-side method, coal and lignite, coal and stone, sand and gravel sectors with a power index greater than one, after the agricultural sector, the building And the industry, because of the greater link that they make with other sectors in terms of purchasing intermediary inputs, had more employment than the total average of activity. In this respect, other parts of the mine had no place among the first parts. Manuscript profile -
Open Access Article
20 - Design of a High Step-up DC-DC Converter Based on QZSI with Low Voltage Dtress by Using Coupled Inductor Technique
Jafari Hosein Mahdi Shaneh Tohid NouriHigh step-up structures are commonly used to upgrade the low voltage levels generated by renewable energy sources. In this paper, a high step-up structure based on Quasi Z-Source network is presented, which has a simple yet functional structure consisting of two inducto MoreHigh step-up structures are commonly used to upgrade the low voltage levels generated by renewable energy sources. In this paper, a high step-up structure based on Quasi Z-Source network is presented, which has a simple yet functional structure consisting of two inductors and two capacitors. Due to the duty cycle of about 50% for this converter, the problems of reverse recovery of diodes and stability are solved. In addition, the common ground of the power switch and the input source simplifies the control circuit. Using the coupled inductor technique as well as the voltage multiplier cell, the converter voltage gain increases significantly. In addition, the stacked capacitor is used to limit the voltage stress on the switch. The use of the proposed structure increases the voltage gain of the converter. The proposed structure also reduces the level of voltage stress on the semiconductors of the circuit, which reduces the cost and increases the efficiency of the circuit. The converter designed with 25V/ 400V input/ output 100Wouput power is simulated in PSpice software and the results are presented. Manuscript profile -
Open Access Article
21 - Design and implement of a high step-up boost converter with voltage multiplier
Sadegh Heidari Beni Mohammad Mehdi MirtalaeeBecause the traditional fossil energy is not renewable modern societies, are facing energy shortages. As a result, it is necessary to develop new energy that is clean and renewable to replace of fossil fuels. Solar energy, photovoltaic power generation, fuel cell and hy MoreBecause the traditional fossil energy is not renewable modern societies, are facing energy shortages. As a result, it is necessary to develop new energy that is clean and renewable to replace of fossil fuels. Solar energy, photovoltaic power generation, fuel cell and hydrogen energy are methods used to big - scale energy sources.In a mono - phase system with two - step structure if the line voltage is 220 volts, bus inverter voltage that connected to network, should be about 380 volts. However, the output voltage of the photovoltaic cells and fuel cells are generally between 25 to 40 volts this voltage is much lower than the bus voltage. So a high efficiency DC-DC converter output voltage is required to boost fuel cells and photovoltaic cells. In this research, will be presented an improved structure as high efficiency voltage boost converter with a voltage multiplier circuit for solar cell applications. In the proposed structure for efficiency improvement, used voltage multiplier circuit techniques and coupled inductors. We have the proposed converter using the active clamp circuit to achieve soft switching conditions and reduce switching losses. generally, the advantages of the proposed converter are high step-up voltage and high efficiency, low voltage stress for switches and diodes, providing soft switching conditions, and ultimately reducing the number of magnetic elements and the circuit's size. In this paper, in addition to describing the operation of the circuit and provide theoretical analyzes, validity of circuit performance will be evaluated through simulation software Manuscript profile -
Open Access Article
22 - Design and Simulation of a New Capacitance Multiplier with Adaptive Current Bias and Quasi-Floating Gate Technique with Electronic Tunability and High Linearity for Biomedical Applications
Mohammad Aghaei Jeshvaghani Mehdi Dolatshahi Sayed Mohammad Ali Zanjani Mohammad Amin HonarvarEmploying capacitance multipliers in low-frequency integrated circuits has a significant effect on reducing the chip size area. The main idea behind the proposed circuit in this paper is to use a folded current follower (FCF) structure to effectively reduce the equivale MoreEmploying capacitance multipliers in low-frequency integrated circuits has a significant effect on reducing the chip size area. The main idea behind the proposed circuit in this paper is to use a folded current follower (FCF) structure to effectively reduce the equivalent series resistance (ESR) in the input stage. Furthermore, using an auxiliary circuit to adapt the bias current of the transistors and applying the necessary signals by the quasi-floating gate technique (QFG), are other approaches employed to reduce the static power consumption while properly increasing the linearity of the proposed circuit, which can be considered as other benefits of the proposed approach. On the other hand, to improve the linearity, negative feedback is used and necessary voltage is applied to the gate of the transistors in the current sampler. The “K” coefficient can be adjusted by the active method. Low input resistance and high output resistance as well as the reduced occupied silicon area are achieved based on the simulation results of the proposed circuit. The simulation results in 0.18 μm technology show that, with a 0.8 V power supply and base capacitor (Cb=1 pF), for 850 nW power consumption, a capacitor equivalent to 204 pF is achieved in the proposed approach. As another example, to realize the 101 pF capacitor with the supply as mentioned above and base capacitor, the proposed multiplier requires 6.3 times less area and 23 times more bandwidth than FCF, which shows the increased accuracy of the proposed design. In the proposed circuit, in the presence of a current adaptive circuit with an input signal range of 7 nA, the output current range is obtained as 1510 nA, While the output bias current is 100nA and the harmonic distortion value is obtained as 3.6%. The proposed circuit has the highest figure of merit 42.823 MHz/μW, which shows superiority in overall performance in comparison with other reported designs. Manuscript profile -
Open Access Article
23 - VARIATIONAL ITERATION METHOD FOR FREDHOLM INTEGRAL EQUATIONS OF THE SECOND KIND
ج. بی آزار H. ابراهیمی -
Open Access Article
24 - Design and Implementation of MOSFET Circuits and CNTFET, Ternary Multiplier in the Field of Galois
Malakeh Karimghasemi-rabori Peiman Keshavarzian -
Open Access Article
25 - Modular Parallel-Prefix Arithmetic Circuits design based on Reversible Computing
Ailin Asadpour Amir Sabbagh Molahosseini Azadeh Alsadat Emrani Zarandi -
Open Access Article
26 - The Role of Business Cycles in Determining Fiscal Policy Multiplier (with Emphasis on Direct and Indirect Taxes): A Case Study of the Iranian Economy
Yousef Moradi Kiumars Shahbazi Soleiman Feizi GanjeAbstract The Purpose of This Study Is to Investigate the Impact of Fiscal Policy On Economic Growth and to Estimate the Fiscal Multiplier During Business Cycles. For This Purpose, Quarterly Data of Iran's Economy Has Been Used During the Period 1993 To 2018. Three Meth MoreAbstract The Purpose of This Study Is to Investigate the Impact of Fiscal Policy On Economic Growth and to Estimate the Fiscal Multiplier During Business Cycles. For This Purpose, Quarterly Data of Iran's Economy Has Been Used During the Period 1993 To 2018. Three Methods Are Used to Estimate the Fiscal Multiplier. 1) Vector Auto-Regression Models Based On Blanchard and Perotti Method 2002, 2- Regression Based Method Introduced by Hall 2009 And 3- Dynamic Stochastic General Equilibrium Models. In The Present Study, Is Used the Second Method and Markov Switching Model, Which Is Based On Regression Specification, To Calculate the Fiscal Multiplier During Business Cycles. Therefore, By Specifying Five Different Models, Such That In Model Number 1, Direct Taxes, In Model Number 2, Indirect Taxes, In Model Number 3, Government Expenditures, In Model Number 4, Government Expenditures and Direct Taxes and In Model 5 Government Expenditures and Indirect Taxes Are Considered As Fiscal Policy Tools. The Results Showed That Direct Taxes Perform Better in Effect of Economic Growth Than Indirect Taxes. Also, Among The Three Instruments of Government Spending and Direct and Indirect Taxes, The Largest Multiplier in The Recession and Boom Period Is Related to Government Spending and Direct Taxes, Respectively. On The Other Hand, The Government's Fiscal Policy Package, Which Contains Indirect Taxes and Expenditures, Works Better in Influencing Economic Growth Than the Package, Which Contains Direct Taxes and Expenditures. Manuscript profile -
Open Access Article
27 - *-frames in Hilbert modules over pro-C*-algebras
M. Naroei Irani A. Nazari -
Open Access Article
28 - On the duality of quadratic minimization problems using pseudo inverses
D. Pappas G. Domazakis -
Open Access Article
29 - On the continuity of some linear maps on certain Banach algebras
H. Farhadi E. Ghaderi -
Open Access Article
30 - On the boundedness of almost multipliers on certain Banach algebras
E. Ansari-Piri M. Shams Yousefi S. Nouri -
Open Access Article
31 - Some algebraic properties of Lambert Multipliers on $L^2$ spaces
A. Zohri S. Khalil Sarbaz -
Open Access Article
32 - Using Fuzzy Interest Rates for Uncertainty Modelling in Enhanced Annuities Pricing
Mahboubeh Aalaei -
Open Access Article
33 - Investigating the New Conservation Laws of Hunter-Saxton Equation via Lie Symmetries
Mehdi Jafari Somayeh Sadat Mahdion -
Open Access Article
34 - THE APPLICATION OF THE VARIATIONAL HOMOTOPY PERTURBATION METHOD ON THE GENERALIZED FISHER'S EQUATION
M. Matinfar M. Mahdavi -
Open Access Article
35 - A SIMPLIFIED LAGRANGIAN MULTIPLIER APPROACH FOR FIXED HEAD SHORT-TERM HYDROTHERMAL SCHEDULING
S. Kavitha Nirmala P.Ratchagar