Indonesian J our nal of Electrical Engineering and Computer Science V ol. 19, No. 1, July 2020, pp. 371 379 ISSN: 2502-4752, DOI: 10.11591/ijeecs.v19i1.pp371-379 r 371 New r eliable modifications of the homotopy methods Khawlah H. Hussain Department of Mechanical T echnology , Basra T echnical Institute Southern T echnical Uni v ersity , Iraq Article Inf o Article history: Recei v ed Dec 14, 2019 Re vised Feb 3, 2020 Accepted Feb 20, 2020 K eyw ords: Caputo deri v ati v e Homotop y analysis method Homotop y perturbation method Inte gro-dif ferential equation ABSTRA CT In this article, ne w modifications of the homotop y methods are presented and applied to non-homogeneous fractional V olterra inte gro-dif ferential equations with boundary conditions. A comparati v e study between the ne w modified hom otop y perturbation method (MHPM) and the ne w modified homotop y analysis method (MHAM). Se v eral illustrati v e e xamples are gi v en to demonstrate the ef fecti v eness and reliability of the methods. Copyright © 2020 Insitute of Advanced Engineeering and Science . All rights r eserved. Corresponding A uthor: Kha wlah H. Hussain, Department of Mechanical T echnology , Basra T echnical Institute Southern T echnical Uni v ersity , AL-Basrah, Iraq. Email: kha wlah.hussain@stu.edu.iq 1. INTR ODUCTION In this paper , we shall be concerned with the non-homogeneous fractional V olterra inte gro-dif ferential equations of the second kind of the form: Z x 0 ( x; t )( y ( t )) dt; (1) c D y ( x )   =   f ( x ) y ( x )   +   ( x )   +   y ( k ) (0) = d k ; (2) y ( k ) (1) = c k ; k = 1 ; ; n; n 1 < n; 0 x 1 ; n 2 N ; (3) where c D denotes a dif ferential operator with fractional order , and the ( x ) ; f ( x ) and ( x; t ) are holo- morphic functions, ( y ( t )) is a polynomial of y ( t ) with constant coef ficients. The homotop y analysis method (HAM) proposed by Liao in 1992 and the homotop y perturbation method (HPM) proposed by He in 1998 are compared through an e v olution equation used as the second e xam- ple in a recent paper by Ganji et al. It is found that the HPM is a special case of the HAM when ~ = 1 . The well-kno wn and po werful HAM is based on both Homotop y in topology and the McLaurin series. In one of his pioneering articles, he claimed that the method does not require either small or lar ge parameters comparing with the perturbation techniques. The general concept of this method has been considered by man y researchers in their published w orks [1–5]. The fractional inte gro-dif ferential equations ha v e attracted much more interest of mathematicians a n d ph ysicists which pro vides an ef ficienc y for the descripti on of man y practical dynamical arising in engineer - ing and scientific disciplines such as, ph ysics, biology , electrochemistry , chemistry , economy , electromagnetic, J ournal homepage: http://ijeecs.iaescor e .com with the boundary conditions Evaluation Warning : The document was created with Spire.PDF for Python.
372 r ISSN: 2502-4752 control theory and viscoelasticit y [1, 2, 6–15]. In recent years, man y authors focus on the de v elopment of numerical and analyti cal techniques for fractional i nte gro-dif ferential equations. F or instance, we can recall the follo wing w orks. Al-Samadi and Gumah [16] applied the HAM for fractional SEIR epidemic model, Zurig at et al. [17] applied HAM for system of fractional inte gro-dif ferential equations. Y ang and Hou [18] applied the Laplace decomposition method to solv e the fractional inte gro-dif ferential equations, Mittal and Nig am [19] applied the Adomian decomposition method to approximate solutions for fractional inte gro- dif ferential equations. Ma and Huang [20] applied h ybrid collocation method to study inte gro-dif ferential equations of fractional order . Moreo v er , properties of the fractional inte gro-dif ferential equations ha v e been studied by se v eral authors [7, 21–27]. The main objecti v e of the present paper is to study the beha vior of the solution that can be formally determined by analytical approximated methods as the MHAM and MHPM. 2. PRELIMIN ARIES In this section, we gi v e f fractional calculus theory which are further used in this paper [2, 7, 25, 28, 29]. Definition 2..1 A r eal function f ( x ) ; x > 0 ; is said to be in the space C "; " 2 R ; if ther e e xists a r eal number p > " suc h that f ( x ) = x p f 1 ( x ) , wher e f 1 ( x ) 2 C [0 ; 1) : Clearly C " C ! if ! ": Definition 2..2 A function f ( x ) ; x > 0 , is said to be in the space C n " ; n 2 N [ f 0 g , if f ( n ) 2 C " : Definition 2..3 [2] The Riemann-Liouville fr actional inte gr al of or der > 0 of a function f 2 C " ; " 1 is defined as J f ( x ) = 1 ( ) Z x 0 ( x t ) 1 f ( t ) dt; x > 0 ; 2 R + ; J 0 f ( x ) = f ( x ) ; (4) wher e R + is the set of positive r eal number s. Definition 2..4 [21] The fr actional derivative of f ( x ) 2 C n 1 ; n 2 N [ f 0 g in the Caputo sense is defined by c D f ( x ) = J n D n f ( x ) = 8 > < > : 1 ( n ) R x 0 ( x t ) n 1 d n f ( t ) dt n dt; n 1 < < n; d n f ( x ) dx n ; = n; (5) wher e the par ameter is the or der of the derivative , in g ener al it is r eal or e ven comple x. But in this c hapter , we will consider as positive r eal. Hence , we have the following pr operties: 1. J J v f = J + v f ; ; v > 0 : 2. J x = ( +1) ( + +1) x + ; > 0 ; > 1 ; x > 0 : 3. J D f ( x ) = f ( x ) P m 1 k =0 f ( k ) (0 + ) x k k ! ; m 1 < m: Definition 2..5 [8] The Riemann-Liouville fr actional derivative of or der > 0 is normally defined as D f ( x ) = D m J m f ( x ) ; m 1 < m: (6) Theor em 2..1 [2] (Banac h cont raction principle). Let ( X ; d ) be a complete metric space , then eac h contr ac- tion mapping T : X ! X has a unique fixed point x of T in X i.e . T x = x: Theor em 2..2 [2] (Sc hauder’ s fix ed point theorem). Let X be a Banac h space and let A a con ve x, closed subset of X . If T : A ! A be the map suc h that the set f T y : y 2 A g is r elatively compact i n X (or T is continuous and completely continouous). Then T has at least one fixed point y 2 A : T y = y : Indonesian J Elec Eng & Comp Sci, V ol. 19, No. 1, July 2020 : 371 379 Evaluation Warning : The document was created with Spire.PDF for Python.
Indonesian J Elec Eng & Comp Sci ISSN: 2502-4752 r 373 3. DESCRIPTION OF THE METHOD Some po werful methods ha v e been focusing on the de v elopment of more adv anced and ef ficient methods for inte gro-dif ferential equat ions such as the HAM and HPM [2, 27, 30, 31]. W e will describe these methods in this section: 3.1. Homotopy analysis method (HAM) The basic concept behind the HAM is illustrated by using the follo wing nonlinear equation: N [ y ] = 0 ; where N is a nonlinear operator , y ( x ) is unkno wn function and x is an independent v ariable. Let y 0 ( x ) denote an initial guess of the e xact solution y ( x ) ; ~ 6 = 0 an auxiliary parameter , H 1 ( x ) 6 = 0 an auxiliary function, and L an auxiliary linear operator with the property L [ s ( x )] = 0 when s ( x ) = 0 . Then using q 2 [0 ; 1] as an embedding parameter , we can construct a homotop y when consider , N [ y ] = 0 ; as follo ws [2]: (1 q ) L [ ( x ; q ) y 0 ( x )] q ~ H 1 ( x ) N [ ( x ; q )] = ^ H [ ( x ; q ); y 0 ( x ) ; H 1 ( x ) ; ~ ; q ] : (7) It should be emphasized that we ha v e great freedom to choose the initial guess y 0 ( x ) ; the auxiliary linear operator L , the non-zero auxiliary parameter ~ , and the auxiliary function H 1 ( x ) : Enforcing the homotop y (7) to be zero, i.e., ^ H (8) (9) 1 [ ( x ;   q );   y 0 ( x ) ;   H 1 ( x ) ;   ~ ;   q ]   =   0 ; ( x ;   0)   =   y 0 ( x ) ; (10) and when q = 1 ; since ~ 6 = 0 and H 1 ( x ) 6 = 0 , the zero-order deformation (9) is equi v alent to ( x ; 1) = y ( x ) : (11) Thus, according to Eqs.(10) and (11), as the embedding parameter q increases from 0 to 1 , ( x ; q ) v aries continuously from the initial approximation y 0 ( x ) to the e xact solution y ( x ) : Such a kind of continuous v ariation is called deformation in homotop y [31]. Due to T aylor’ s theorem, ( x ; q ) can be e xpanded in a po wer series of q as follo ws: ( x ; q ) = y 0 ( x ) + 1 X m =1 y m ( x ) q m ; (12) where, y m ( x ) = 1 m ! @ m ( x ; q ) @ q m j q =0 : (13) Let the initial guess y 0 ( x ) , the auxiliary linear parameter L , the nonzero auxiliary parameter ~ and the auxiliary function H 1 ( x ) be properly chosen so that the po wer series (12) of ( x ; q ) con v er ges at q = 1 , then, we ha v e under these assumptions the solution series, y ( x ) = ( x ; 1) = y 0 ( x ) + 1 X m =1 y m ( x ) : (14) Ne w r eliable modifications of ... (Khawlah H. Hussain) we have the so-called zero-order deformation equation (1 − q)L[φ(x; q) − y0(x)] = qŸH1(x)N[φ(x; q)], when q = 0, the zero-order deformation (9) becomes Evaluation Warning : The document was created with Spire.PDF for Python.
374 r ISSN: 2502-4752 From (12), we can write (9) as follo ws: (1 q ) L [ ( x ; q ) y 0 ( x )] = (1 q ) L [ 1 X m =1 y m ( x ) q m ] (15) = q ~ H 1 ( x ) N [ ( x ; q )] ; then, L [ 1 X m =1 y m ( x ) q m ] q L [ 1 X m =1 y m ( x ) q m ] = q ~ H 1 ( x ) N [ ( x ; q )] : (16) By dif ferentiating (16) m times with respect to q , we obtain, f L [ 1 X m =1 y m ( x ) q m ] q L [ 1 X m =1 y m ( x ) q m ] g ( m ) = q ~ H 1 ( x ) N [ ( x ; q )] ( m ) = m ! L [ y m ( x ) y m 1 ( x )] = ~ H 1 ( x ) m @ m 1 N [ ( x ; q )] @ q m 1 j q =0 : Therefore, L [ y m ( x ) m y m 1 ( x )] = ~ H 1 ( x ) < m ( ! y m 1 ( x )) ; (17) where, < m ( ! y m 1 ( x )) = 1 ( m 1)! @ m 1 N [ ' ( x ; q )] @ q m 1 j q =0 ; (18) and m = ( 0 m 1 ; 1 m > 1 : 4. HOMO T OPY PER TURB A TION METHOD (HPM) The homotop y perturbation method first proposed by He [1]. T o illustrate the basic idea of this method, we consider the follo wing nonlinear dif ferential equation A ( y )     f ( r )   =   0 ;   r   2   ; (19) under the boundary conditions B y ; @ y @ n = 0 ; r 2 ; (20) where   A   is   a   general   differential   operator,   B   is   a   boundary   operator,   f ( r )   is   a   known   analytic   function,     is   the   boundary   of   the   domain   .   In   general,   the   operator   A   can   be   divided   into   two   parts   L   and   N ,   where   L   is   linear,   while   N   is   nonlinear.   (19)   therefore   can   be   rewritten   as   follows L ( y ) + N ( y ) f ( r ) = 0 : (21) By the homotop y technique (Liao 1992, 1997). W e construct a homotop y v ( r ; p ) : [0 ; 1] ! R which satisfies Indonesian J Elec Eng & Comp Sci, V ol. 19, No. 1, July 2020 : 371 379 Evaluation Warning : The document was created with Spire.PDF for Python.
Indonesian J Elec Eng & Comp Sci ISSN: 2502-4752 r 375 H ( v ; p ) = (1 p )[ L ( v ) L ( y 0 )] + p [ A ( v ) f ( r )] = 0 ; p 2 [0 ; 1] : (22) or H ( v ; p ) = L ( v ) L ( y 0 ) + pL ( y 0 )] + p [ N ( v ) f ( r )] = 0 ; (23) where p 2 [0 ; 1] is an embedding parame ter , y 0 is an initial approximat ion of (19) which satisfies the boundary conditions. From (22), (23) we ha v e (24) H ( v ;   0)   =   L ( v )     L ( y 0 )   =   0 ; H ( v ;   1)   =   A ( v )     f ( r )   =   0 : (25) The changing in the process of p from zero to unity is just that of v ( r ; p ) from y 0 ( r ) to y ( r ) . In topology this is called deformation and L ( v ) L ( y 0 ) , and A ( v ) f ( r ) are called homotopic. No w , assume that the solution of Eqs. (22), (23) can be e xpressed as (26) The   approximate   solution   of   (19)   can   be   obtained   by   Setting   p   =   1 . u = lim p ! 1 v = v 0 + v 1 + v 2 + (27) 5. THE MAIN RESUL TS In this section, we shall gi v e an uniqueness result of (1) , with the condition (2) and pro v e it. Before starting and pro ving the main results, we introduce the follo wing h ypotheses: (A1) There e xists a constant L > 0 such that, for an y y 1 ; y 2 2 C ( J ; R ) j ( y 1 ) ( y 2 ) j L j y 1 y 2 j (A2) There e xists a function 2 C ( D ; R + ) ; the set of all positi v e function continuous on D = f ( x; t ) 2 R R : 0 t x 1 g such that = sup x;t 2 [0 ; 1] R x 0 j ( x; t ) j dt < 1 : (A3) The tw o functions f ; : J ! R are continuous. Lemma 5..1 If y 0 ( x ) 2 C ( J ; R ) ; then y ( x ) 2 C ( J ; R + ) is a solution of the pr oblem (1) (2) if f y satisfying y ( x ) = y 0 + 1 ( ) Z x 0 ( x s ) 1 f ( s ) y ( s ) ds + 1 ( ) Z x 0 ( x s ) 1 ( s ) ds + 1 ( ) Z x 0 ( x s ) 1 Z s 0 ( s; )( y ( )) d ds; wher e y 0 = P n 1 k =0 d k x k k ! : Our result is based on the Banach contraction principle. Theor em 5..2 Assume that (A1), (A2) and (A3) hold. If k f k 1 + L < 1 : (28) Then   there   exists   a   unique   solution   y ( x )   2   C ( J )   to   (1)     (2) : Ne w r eliable modifications of ... (Khawlah H. Hussain) v = v0 + pv1 + p2v2 + · · · Γ(α + 1) Evaluation Warning : The document was created with Spire.PDF for Python.
376 r ISSN: 2502-4752 Pr oof 5..3 By Lemma 5..1. we know that a function y is a solution to (1) (2) if f y satisfies y ( x ) = y 0 + 1 ( ) Z x 0 ( x s ) 1 f ( s ) y ( s ) ds + 1 ( ) Z x 0 ( x s ) 1 ( s ) ds + 1 ( ) Z x 0 ( x s ) 1 Z s 0 ( s; )( y ( )) d ds: Let the oper ator T : C ( J ; R ) ! C ( J ; R ) be defined by ( T y )( x ) = y 0 + 1 ( ) Z x 0 ( x s ) 1 f ( s ) y ( s ) ds + 1 ( ) Z x 0 ( x s ) 1 ( s ) ds + 1 ( ) Z x 0 ( x s ) 1 Z s 0 ( s; )( y ( )) d ds; we can see that, If y 2 C ( J ; R ) is a fixed point of T , then y is a solution of (1) (2) . Now we pr o ve T has a fixed point y in C ( J ; R ) . F or that, let y 1 ; y 2 2 C ( J ; R ) and for any x 2 [0 ; 1] suc h that y 1 ( x ) = y 0 + 1 ( ) Z x 0 ( x s ) 1 f ( s ) y 1 ( s ) ds + 1 ( ) Z x 0 ( x s ) 1 ( s ) ds + 1 ( ) Z x 0 ( x s ) 1 Z s 0 ( s; )( y 1 ( )) d ds; and, y 2 ( x ) = y 0 + 1 ( ) Z x 0 ( x s ) 1 f ( s ) y 2 ( s ) ds + 1 ( ) Z x 0 ( x s ) 1 ( s ) ds + 1 ( ) Z x 0 ( x s ) 1 Z s 0 ( s; )( y 2 ( )) d ds: Consequently , we g et j ( T y 1 )( x ) ( T y 2 )( x ) j 1 ( ) Z x 0 ( x s ) 1 j f ( s ) j j y 1 ( s ) y 2 ( s ) j ds + 1 ( ) Z x 0 ( x s ) 1 R s 0 j ( s; ) j j ( y 1 ( )) ( y 2 ( )) j d ds k f k 1 ( + 1) j y 1 ( x ) y 2 ( x ) j + L ( + 1) j y 1 ( x ) y 2 ( x ) j ( + 1) j y 1 ( x ) y 2 ( x ) j = k f k 1 + L ( + 1) j y 1 ( x ) y 2 ( x ) j : F r om the inequality (28) we have k T y 1 T y 2 k 1 k f k 1 + L ( + 1) k y 1 y 2 k 1 : This   means   that   T   is   contr action   map.   By   the   Banac h   contr action   principle ,   we   can   conclude   that   T has   a   unique   fixed   p oint   y   i n   C ( J ;   R ) : 6.   NUMERICAL   EXAMPLE In   this   section,   we   proposed   a   numerical   solution   for   nonlinear   fractional   V olterra   integro-differential   equations   by   using   the   MHAM   and   MHPM ,   as   shown   in   T ables   1-3   and   F igure   1. Indonesian J Elec Eng & Comp Sci, V ol. 19, No. 1, July 2020 : 371 379 Evaluation Warning : The document was created with Spire.PDF for Python.
Indonesian J Elec Eng & Comp Sci ISSN: 2502-4752 r 377 Example 1. Consider the follo wing fractional V olterra inte gro-dif ferential equation with the boundary conditions: c D y ( x ) = y ( x ) + x (1 + e x ) + 3 e x Z x 0 y ( t ) dt; 3 < 4 ; x 2 [0 ; 1] ; (29) with the boundary conditions: y (0) = 1 ; y (1) = 1 + e; y 00 (0) = 2 ; y 00 (1) = 3 e: (30) Therefore the e xact solution is y ( x ) = 1 + xe x ; for = 4 T able 1. Numerical results of the e xample 1 x Exact MHAM MHPM 0.0 1.000000000 1.000000000 1.000000000 0.1 1.110517092 1.107047479 1.102647336 0.2 1.244280552 1.237721115 1.229286556 0.3 1.404957642 1.395985741 1.384226779 0.4 1.596729879 1.586238703 1.572164823 0.5 1.824360635 1.813384918 1.798234919 0.6 2.093271280 2.082918367 2.068063429 0.7 2.409626895 2.401010221 2.387829229 0.8 2.780432743 2.774603867 2.784330528 0.9 3.213642800 3.211517152 3.205058944 1.0 3.718281828 3.718552210 3.718281829 T able 2. V alues of A and B for dif ferent v alues of by MHAM = 4 = 3 : 5 A 0.96461853025138 1.06172444793295 B 3.43572350417823 1.60468681403168 T able 3. V alues of A and B for dif ferent v alues of by MHPM = 4 = 3 : 5 A 0.9200006577 0.9855569381 B 3.806600712 2.306799253 Figure 1. Numerical Results of the Example 1 Ne w r eliable modifications of ... (Khawlah H. Hussain) Evaluation Warning : The document was created with Spire.PDF for Python.
378 r ISSN: 2502-4752 7. CONCLUSION In this paper , ne w modifications of the homotop y perturbation method (HPM) and the homotop y analysis method (HAM) are presented and applied to non-homogeneous fractional V olterra inte gro-dif ferential equations with boundary conditions. A comparati v e study between the ne w modified of homotop y perturbation method (MHPM) and the ne w modified of homotop y analysis method (MHAM). F or this purpose, we sho wed that the MHAM is more rapid con v er gence than the MHPM. REFERENCES [1] A.A. Hamoud, K.P . Ghadle, M. Bani Issa, Ginisw amy , Existence and uniqueness theor ems for fr actional V olterr a-F r edholm inte gr o-dif fer ential equations , Int. J. Appl. Math. 31(3) (2018), 333–348. [2] A.A. Hamoud, K.P . Ghadle, Usa g e of the homotopy analysis method for solving fr actional V olterr a- F r edholm inte gr o-dif fer ential equation of the second kind , T amkang Journal of Mathematics, 49(4) (2018), 301–315. [3] A.A. Hamoud, M. Bani Issa, K.P . Ghadle, Existence and uniqueness r esults for nonlinear V olterr a- F r edholm inte gr o-dif fer ential equations , Nonlinear Functional Analysis and Applications, 23(4) (2018), 797–805. [4] A.A. Hamoud, K.H. Hussain, N.M. Mohammed, K.P . Ghadle, Solving F r edholm inte gr o-dif fer ential equa- tions by using numerical tec hniques , Nonlinear Functional Analysis and Applications, 24(3) (2019), 533–542. [5] A.A. Hamoud, K.H. Hussain, N.M. Mohammed, K.P . Ghadle, An e xistence and con ver g ence r esults for Caputo fr actional V olterr a inte gr o-dif fer ential equations , Jordan Journal of Mathematics and Statistics, 12(3) (2019), 307–327. [6] S. Alkan, V . Hatipoglu, Appr oximate solutions of V olterr a-F r edholm inte gr o-dif fer ential equations of fr ac- tional or der , Tbilisi Math. J., 10(2) (2017), 1–13. [7] A.A. Hamoud, K.P . Ghadle, Existence and uniqueness of solutions for fr actional mixed V olterr a-F r edholm inte gr o-dif fer ential equations , Indian J. Math. 60(3) (2018), 375–395. [8] A.A. Hamoud, K.P . Ghadle, S.M. Atshan, The appr oximate solutions of fr actional inte gr o-dif fer ential equations by using modified Adomian decomposition method , Khayyam Journal of Mathematics, 5(1) (2019), 21–39. [9] A.A. Hamoud, K.P . Ghadle, Modified Adomian decomposition method for solving fuzzy V olterr a- F r edholm inte gr al equations , J. Indian Math. Soc. 85(1-2) (2018), 52–69. [10] A.A. Hamoud, A.D. Azeez, K.P . Ghadle, A study of some iter ative methods for solving fuzzy V olterr a- F r edholm inte gr al equations , Indonesian J. Elec. Eng. & Comp. Sci. 11(3) (2018), 1228–1235. [11] A.A. Hamoud, K.P . Ghadle, Existence and uniqueness of the solution for V olterr a-F r edholm inte gr o- dif fer ential equations , Journal of Siberian Federal Uni v ersity . Mathematics & Ph ysics, 11(6) (2018), 692–701. [12] A.A. Hamoud, K.P . Ghadle, On the numerical solution of nonlinear V olterr a-F r edholm inte gr al equations by variational iter ation method , Int. J. Adv . Sci. T ech. Research, 3 (2016), 45–51. [13] A.A. Hamoud, K.P . Ghadle, The combined modi ed Laplace with Adomian decomposition method for solving the nonlinear V olterr a-F r edholm inte gr o- dif fer ential equations , J. K orean Soc. Ind. Appl. Math., 21 (2017), 17–28. [14] A.A. Hamoud, K.P . Ghadle, The r eliable modified of Laplace Adomian decomposition method to solve nonlinear interval V olterr a-F r edholm inte gr al equations , K orean J. Math., 25(3) (2017), 323–334. [15] S.M. Atshan, A.A. Hamoud, Monotone iter ative tec hnique for nonlinear V olterr a-F r edholm inte gr o- dif fer ential equations , Int. J. Math. And Appl., 6(2-B) (2018), 1–9. [16] M. AL-Smadi, G. Gumah, On the homotopy analysis method for fr actional SEIR epidemic model , Res. J. Appl. Sci. Engg. T ech., 7(18) (2014), 3809–3820. [17] M. Zurig at, S. Momani, A. Ala wneh, Homotopy analysis method for systems of fr actional inte gr o- dif fer ential equations , Neur . P arallel Sci. Comput., 17 (2009), 169–186. [18] C. Y ang, J. Hou, Numerical solution of inte gr o-dif fer ential equations of fr actional or der by Laplace de- composition method , Wseas T rans. Math., 12(12) (2013), 1173–1183. [19] R. Mittal, R. Nig am, Solution of fr actional inte gr o-dif fer ential equations by Adomian decomposition method , Int. J. Appl. Math. Mech., 4(2) (2008), 87–94. Indonesian J Elec Eng & Comp Sci, V ol. 19, No. 1, July 2020 : 371 379 Evaluation Warning : The document was created with Spire.PDF for Python.
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