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ORIGINAL RESEARCH article

Front. Phys., 31 January 2022
Sec. Statistical and Computational Physics
This article is part of the Research Topic Differential Geometric Methods in Modern Physics View all 7 articles

Visco-Da Rios Equation in 3-Dimensional Riemannian Manifold

  • 1Department of Mathematics and Computer Science, Eskisehir Osmangazi University, Eskisehir, Turkey
  • 2Department of Mathematics Education and RINS, Gyeongsang National University, Jinju, Korea

In this paper, we study two classes of a space curve evolution in terms of Frenet frame for the visco-Da Rios equation in a 3-dimensional Riemannain manifold. Also, we obtain the connection between the visco-Da Rios equation and nonlinear Schrödinger equation for two classes in a 3-dimensional Riemannain manifold with constant sectional curvature. Finally, we give the Bäcklund transformations of space curve with the visco-Da Rios equation.

1 Introduction

The study of the motion of curves is understanding many physical processes such as dynamics of vortex filaments and Heisenberg spin chains. In particular, the dynamics of vortex filaments has provided for almost a century one of the most interesting connections between differential geometry and soliton equation. Lamb [1] described the connection between a certain class of the moving curves in Euclidean space with certain integrable equations. Also, Murugesh and Balakrishnan [2] showed that there are two other classes of curve evolution that get associated with a given solution of the integrable equation as natural extensions of Lamb’s formulation and they investigated nonlinear Schrödinger (NLS) equations of integrable equations with modified vortex filaments for two classes.

Vortex filament equation is also called Da Rios equation or localized induction equation. The theory of solitons of Da Rios equation was discovered by Hasimoto proving that the solutions of Da Rios equation are related to solutions of the cubic nonlinear Schrödinger equation, which is well known to be an equation with soliton sloution [39] etc. In particular, Barros et al. [10] studied solutions of Da Rios equation in three dimensional Lorentzian space form and they also gave classification of flat ruled surfaces with Da Rios equation. Aydin et al. [11] investigated flat Hasimoto surfaces given by 1-parameter family of Da Rios equation in pseudo-Galilean space. By using Da Rios equation, Grbović and Nešović [12] studied derived the vortex filament equation for a null Cartan curve and obtained evolution equation for it’s torsion. Also, they described Bäcklund transformation of a null Cartan curve in Minkowski 3-space as a transformation which maps a null Cartan helix to another null Cartan helix. Qu, Han and Kang [13] investigated Bäcklund transformations relating to binormal flow and extended Harry-Dym flow as integrable geometric flows. Some special solutions of the integrable systems are used to obtain the explicit Bäcklund transformations. Also, Sariaydin [14] dealt with Bäcklund transformation for extended Harry-Dym flow as geometric flow, and author gave new solutions of the integrable system from the aid of the extended version of the Riccati mapping method.

On the other hand, Langer and Perline [15] introduced a natural generalization of the Da Rios equation in higher dimensional space. Pak [16] find a complete description of the connection between the Da Rios equation and nonlinear Schrödinger equation on complete 3-dimensional Riemannian manifold and he also studied the case when viscosity effects are present on the dynamics of the fluids in a complete 3-dimensional Riemannian manifold, that is, he considered the equation as follows:

Ct=CsDdsCs+wCs,(1.1)

where w is the viscosity and a non-negative constant. Equation 1.1 is called the visco-Da Rios equation. If the viscosity w is zero, the equation is reduced to Da Rios equation on Riemannian manifold, and if the manifold is 3-dimensional Euclidean space, the equation is classical Da Rios equation. Pak [16] discussed the visco-Da Rios equation in a 3-dimensional Riemannian manifold for the first class introduced by Lamb.

This paper is organized as the follows: In Section 2, we present a brief review for evolutions of Frenet frame of a curve in 3-dimensional Riemannian manifold. In Section 3, we investigate the geometric flow described by Eq. 1.1 for two classes introduced by Murugesh and Balakrishnan, and give the connection between the visco-Da Rios equation and nonlinear Schrödinger equation in 3-dimensional Riemannian manifold with constant sectional curvature. Finally, in Section 4 we discuss Bäcklund transformations associated with the visco-Da Rios Eq. 1.1 for two classes of a curve in a 3-dimensional Riemannian manifold.

2 Preliminaries

Let (M, ⟨,⟩) be a 3-dimensional Riemannian manifold and ∇ denotes the Levi-Civita connection of M. Let TpM denotes the set of all tangent vectors to M at p ∈ M. For a vector X in TpM, we define the norm of X by X=X,X.

Let C:IM be a smooth curve parametrized by arc-length s and {t=DCds,n,b} be the Frenet frame of the curve C. We denote by DXds(s)tX(s) for the derivative of a vector field X along the curve C(s). Then the Frenet equations define the curvature κ(s) and the torsion τ(s) along C(s) as follows:

Ddstnb=0κ0κ0τ0τ0tnb.(2.1)

It is well-known that the time evolutions of the moving frames {t, n, b} are expressed as

Ddttnb=0αβα0γβγ0tnb,(2.2)

where α, β and γ are smooth functions which determine the motion of the curve C. Also, the compatibility conditions

DdtDdst=DdsDdtt,DdtDdsb=DdsDdtb

imply

κt=αsτβ,τt=γs+κβ,βs=κγτα.(2.3)

3 Nonlinear Schrödinger Equation for Two Classes

3.1 Nonlinear Schrödinger Equation for the Second Class

Consider the second frame {B,M,M̄} for the second class of the unit speed curve as follows:

B=b,M=nitϕ1,M̄=n+itϕ1̄,(3.1)

where ϕ1 = ei∫κ and X̄ represents the complex conjugate of X.

Now to get the repulsive type nonlinear Schrödinger equation (NLS) of the second class of the curve evolution, we take the second Hasimoto transformation defined by [17].

ϕ=τϕ1.(3.2)

From Eq. 3.1, the following lemma shows a way of changing the old moving frame {t, n, b} into the new complex valued frame {B,M,M̄}.

Lemma 1. We have

tnb=i2ϕ1̄i2ϕ1012ϕ1̄12ϕ10001MM̄B.(3.3)

Now we consider

X=Cs=b(3.4)

and a geometric flow

Ct=g1t+g2n+g3b,(3.5)

where g1, g2 and g3 are smooth functions with parameters s and t.

Since the parameters s and t are independent, and Levi-Civita connection is symmetric, we have

Ddsγt=Ddsg1t+g2n+g3b=g1sκg2t+g2s+κg1g3τn+g3s+τg2b,Ddtγs=Ddtb=βtγn,

which imply

β=g1sκg2,γ=g2s+κg1τg3,g3s=τg2.(3.6)

Suppose that the geometric flow Ct of the spatial curve C on a 3-dimensional Riemannian manifold satisfies the visco-Da Rios equation as follows:

Ct=CsDdsCs+wCs=τt+wb.(3.7)

Then, we can choose g1 = τ, g2 = 0 and g3 = w in Eqs. 3.5, 3.6 leads to

β=τs,γ=κτ+wτ.

Thus, from the third equation in Eq. 2.3 and the above equations we obtain

α=1τ2τs2κ2+κw

and have the following theorem for the time evolution equations:

Theorem 1. The geometric flow Eq. 3.7 implies the time evolutions of frame fields, the curvature and the torsion of a spatial curve C with the second frame in a 3-dimensional Riemannian manifold as follows:

Ddttnb=0τssτκ2+κwτsτssτ+κ2κw0κτ+τwτsκττw0tnb,(3.8)
κt=τssτκ2+κws+ττs,τt=κτ+τwsκτs,(3.9)

where we denote ζs=ζs and ζt=ζt.

Remark 1. System Eq. 3.9 has a solution as

κs,t=12w2ba,τs,t=asecha2s+bt+c,

where a, b, c are constants with a ≠ 0.

Lemma 2. Let {B,M,M̄} be the complex - valued second frame of the curve C defined by Eq. 3.1 in 3-dimensional Riemannian manifold. If the geometric flow Ct of the curve C satisfies the visco-Da-Rios equation, the Riemannian curvature tensor R satisfies the following:

RCt,CsM=iR1213|ϕ|2M+ϕR1323iR1313B,(3.10)

where R1213 = ⟨R(t, n)t, b⟩, R1323 = ⟨R(t, b)n, b⟩ and R1313 = ⟨R(t, b)t, b⟩.

Proof. In fact R(Ct,Cs)M=R(τt+wb,b)(nit)ϕ1=ϕR(t,b)niϕR(t,b)t implies Eq. 3.10.

Theorem 2. The visco-Da Rios equation for the second frame of the curve C in 3-dimensional Riemannian manifold given as

Ct=CsDdsCs+wCs(3.11)

is equivalent to the non-linear Schrödinger equation

ϕt=iϕss+wϕs+Fϕϕ,(3.12)

where a complex valued function F(ϕ)=i2|ϕ|2R1323+iR1313iR1213|ϕ|dt+i2D(t) for some real valued function D(t).

Proof. First, we can compute the derivative of the vector M with the help of Eq. 3.8 as:

DdtM=Ddtniteiκds=wϕ+iϕsB+iQs,tM,

it follows that we have

DdsDdtM=Ddswϕ+iϕsB+iQM=wϕs+iϕss+iQϕBτwϕ+iϕsn+iQsM,

where Q(s,t)=κκ2+κwτssτ. Since n=12ϕ1̄M+12ϕ1M̄ and ϕ = τϕ1, the last equation becomes

DdsDdtM=wϕs+iϕss+iQϕB+iQs12wϕϕ̄12iϕsϕ̄M+12wϕ212iϕϕsM̄.(3.13)

Also, one finds

DdtDdsM=ϕtB+12wϕϕ̄+iϕϕ̄sM12wϕ2+iϕϕsM̄.(3.14)

On the other hand, the Riemannian curvature identity is given by

RCt,CsM=DdsDdtMDdtDdsM,(3.15)

it follows that from Eqs. 3.13, 3.14 we have

RCt,CsM=wϕs+iϕss+iQϕϕtB+iQs12i|ϕ|s2M.(3.16)

Combining Eqs. 3.11, 3.16 we get

wϕs+iϕss+iQϕϕt=ϕR1323iR1313,Qs12|ϕ|s2=R1213|ϕ|2,(3.17)

and the second equation of Eq. 3.17 implies

Qs,t=12|ϕ|2R1213|ϕ|2ds+Dt,

where D(t) is a real valued function with a parameter t. Thus, the first Eq. 3.17 leads to a non-linear Schrödinger equation

ϕt=iϕss+wϕs+Fϕϕ

with a complex valued function F(ϕ)=i2|ϕ|2R1323+iR1313iR1213|ϕ|dt+i2D(t).

Now, we consider a 3-dimensional Riemannian manifold with constant sectional curvature.

Theorem 3. The visco-Da Rios equation for the second frame of the curve C in 3-dimensional Riemannian manifold with constant sectional curvature c is equivalent to the focusing non-linear Schrödinger equation

iΦt=Φss12|Φ|2Φ,

with a transformation Φ(s,t)=ϕ(s,t)ew24t12t(D(r)+c+w2)dr12ws.

Proof. It is well known that a 3-dimensional Riemannian manifold has a constant sectional curvature c if and only if

RX,YW,Z=cX,WY,ZY,WX,Z(3.18)

for tangent vectors X, Y, Z and W. From this, we get

R1323=Rt,bn,b=0,R1213=Rt,nb,b=0.

So, the non-linear Schrödinger Eq. 3.12 in Theorem 2 is reduced to

ϕt=iϕss+wϕs+i2|ϕ|2+Dt+cϕ.(3.19)

Now, we put

Φs,t=ϕs,teA,

where A=w24iti2t(D(r)+c+w2)dri2ws, its partial derivatives with respect to t and s imply

ϕt=eA(Φtiw24Φ+i2Dt+c+w2Φ,ϕs=eAΦs+i2wΦ,ϕss=eAΦss+iwΦs14w2Φ.

Thus, Eq. 3.19 is expressed as the focusing non-linear Schrödinger equation:

iΦt=Φss12|Φ|2Φ.

Example 1. The visco-Da Rios equation for the second frame of the curve C in 3-dimensional Riemannian manifold with constant sectional curvature c is transformed into the non-linear Schrödinger equation Eq. 3.19 by using the second Hasimoto transformation Eq. 3.2. To solve the non-linear Schrödinger equation:

ϕt=iϕss+wϕs+i2|ϕ|2+Dt+cϕ,(3.20)

the starting hypothesis is

ϕs,t=fsmt=fρ,

where ρ = s − mt. We substitute above relation into Eq. 3.20 to get:

mdfρdρ=id2fρdρ2wdfρdρ+i2κ2ρ+Dt+cfρ.

Suppose that the curve C has constant curvature, that is, κ(ρ) = constant(= κ0), and D(t) = 0. Then the last equation leads to

d2fdρ2im+wdfdρ+12κ02+cf=0,

whose solution is

fρ=ϕs,t=c1e12imw+m+w2+2κ02+csmt+c2e12im+w+m+w2+2κ02+csmt,

where c1 and c2 are integration constants.

3.2 Nonlinear Schrödinger Equation for the Third Class

The third frame {N,P,P̄} for the third class of the unit speed curve is given by

N=n,P=t+ib,P̄=tib.

We consider the third Hasimoto transformation defined by [2].

ψ=κiτ,

then one has

DdsP=ψn.

The following lemma shows a way of changing the old moving frame {t, n, b} into the new complex valued frame {N,P,P̄}, and it is useful late.

Lemma 3. We have

tnb=012121000i2i2NPP̄.(3.21)

Now we consider

X=Cs=n

and a geometric flow

Ct=h1t+h2n+h3b,(3.22)

where h1, h2 and h3 are smooth functions with parameters s and t.

By applying compatibility condition DdsCt=DdtCs and Eq. 2.2, we obtain

α=h1s+κh2,γ=h3s+τh2,h2s=κh1+τh3.

Suppose that the geometric flow Ct of the spatial curve C on a 3-dimensional Riemannian manifold satisfies the visco-Da Rios Eq. 3.11. Then we have

Ct=τt+wn+κb,(3.23)

which implies that

h1=τ,h2=w,h3=κ

from this, one finds

α=τs+κw,γ=κs+τw.

Thus, we ave

Theorem 4. The geometric flow Eq. 3.23 implies the time evolutions of frame fields, the curvature and the torsion of the spatial curve C with the third frame in a 3-dimensional Riemannian manifold as follows:

Ddttnb=0τs+κw12κ2+τ2τsκw0κs+τw12κ2+τ2κsτw0tnb,(3.24)
κt=τs+κws12τκ2+τ2,τt=κs+τws+12κκ2+τ2.(3.25)

Now, we prove that the third Hasimoto transformation is solution of a non-linear Schrödinger equation of the visco-Da Rios equation for the third frame of the unit speed curve.

Theorem 5. The visco-Da Rios equation Eq. 3.11 for the third frame of the curve C in 3-dimensional Riemannian manifold is equivalent to the non-linear Schrödinger equation

ψt=iψsswψs+Gψ,(3.26)

where a complex valued function G(ψ) is given by

Gψ=i2|ψ|2+iκR1323τR1213dt+i2Dtψ+τR1212+iR1232+κR1232+iR2323

for some real valued function D(t).

Proof. It follows directly a similar method of proof of Theorem 2.

Suppose that a 3-dimensional Riemannian manifold has a constant sectional curvature c. Then, Riemannian curvature tensor Eq. 3.18 implies

R1323=0,R1213=0,R1232=0

from this, Eq. 3.26 can be rewritten as the form:

ψt=iψsswψs+i2|ψ|2+Dt+2cψ.(3.27)

Now, if we consider a transformation defined by

Ψ=ψeiw24t+12Dt+2c+w2dt+ws,(3.28)

then this transformation implies that Eq. 3.27 is expressed as the non-linear Schrödinger equation

iΨt=Ψss+12|Ψ|2Ψ.

Thus, we have

Theorem 6. The visco-Da Rios equation for the third frame of the curve C in 3-dimensional Riemannian manifold with constant sectional curvature c is equivalent to the non-linear Schrödinger equation

iΨt=Ψss+12|Ψ|2Ψ,

where the transformation Ψ is given by Eq. 3.28.

4 Bäcklund Transformation and Visco-Da Rios Equation

In this section, we study the Bäcklund transformations of integrable geometric curve flows in 3-dimensional Riemannian manifold.

Now, we construct the Bäcklund transformation of the geometric flow Eq. 3.7 of the visco-Da Rios equation for the second frame of the curve C. Considering another curve related C by

C̃s,t=Cs,t+μs,tt+νs,tn+ξs,tb,(4.1)

where μ, ν and ξ are the smooth functions of s and t. Using Eqs. 3.4, 3.8, a direct computation leads to

C̃s=μsκνt+νs+κμτξn+1+ξs+τνb,C̃t=τ+μt+ντssτ+κ2κwξτst+νt+μτssτκ2+κw+ξκττwn+w+ξtμτs+νκτ+τwb.(4.2)

Let s̃ be the arclength parameter of the curve C̃. Then

ds̃=Cs̃ds=μsκν2+νs+κμτξ2+1+ξs+τν2ds:=Ωds.

It follows that the unit tangent vector of the curve C̃ is given by

t̃=p1t+p2n+p3b,(4.3)

where p1 = Ω−1s − κν), p2 = Ω−1(νs + κμ − τξ) and p3 = Ω−1(1 + ξs + τν). Differentiating Eq. 4.3 with respect to s̃, we get

Dds̃t̃=p1sκp2Ωt+p2s+κp1τp3Ωn+p3s+τp2Ωb

which gives the curvature of the curve C̃:

κ̃=p1sκp22+p2s+κp1τp32+p3s+τp22ΩΘΩ.(4.4)

It follows that form Eq. 2.1 the principal normal vector of the curve C̃ is given by

ñ=p1sκp2Θt+p2s+κp1τp3Θn+p3s+τp2Θb.(4.5)

Thus, Eqs. 4.3, 4.5 Imply

b̃=p2p3s+τp2p3p2s+κp1τp3Θt+p1p3s+τp2+p3p1sκp2Θn+p1p2s+κp1τp3p2p1sκp2Θb:=q1t+q2n+q3b.(4.6)

From its derivative with respect to s̃, we obtain the torsion of the curve C̃as:

τ̃=1ΩΘp1sκp2q1sκq2+p2s+κp1τp3q2s+κq1τq3+p3s+τp2q3s+τq31ΩΘΓ.(4.7)

Now, we assume that the flows of the curves C and C̃ are governed by the same integrable system, that is, the curve C̃ also fulfills the geometric flow of the visco-Da Rios equation for the second frame as follows:

C̃t=τ̃t̃+wb̃.(4.8)

Then, the Bäcklund transformation of the geometric flow of the visco-Da Rios equation for the second frame with the help of Eqs. 4.2, 4.3, 4.6, 4.7 turns out to be the following result.

Theorem 7. The geometric flow Eq. 3.7 of the visco-Da Rios equation for the second frame in 3-dimensional Riemannian manifold is invariant with respect to the Bäcklund transformation Eq. 4.1 if μ, ν and ξ satisfy the system

μt+τ+ντssτ+κ2κwξτs=ΓΩΘp1+wq1,νt+μτssτκ2+κw+ξκττw=ΓΩΘp2+wq2,ξt+wμτs+νκτ+τw=ΓΩΘp3+wq3.

Finally, we construct the Bäcklund transformation of the geometric flow (3.7) of the visco-Da Rios equation for the third frame {N,P,P̄} of the curve C. Considering another curve related C by

C̃s,t=Cs,t+ρs,tt+σs,tn+ςs,tb,(4.9)

where ρ, σ and ς are the smooth functions of s and t.

Using Eqs. 3.23, 3.24, a direct computation leads to

C̃s=ρsκσt+1+σs+κρτςn+ςs+τσb,C̃t=τ+ρt+στsκw12ςκ2+τ2t+w+σt+ρτs+κwςκs+τwn+κ+ςt+σκs+τw+12ρκ2+τ2b.(4.10)

Let s̃ be the arclength parameter of the curve C̃ and Ω denote the norm of the tangent vector Cs̃ of the curve C̃. Then, the unit tangent vector of the curve C̃ is given by

t̃=u1t+u2n+u3b,(4.11)

where u1 = Ω−1(ρs − κσ), u2 = Ω−1(σs + κρ − τς) and u3 = Ω−1(1 + ςs + τσ).

Equation 4.11 Implies

Dds̃t̃=u1sκu2Ωt+u2s+κu1τu3Ωn+u3s+τu2Ωb.(4.12)

It follows that the curvature of the curve C̃ is given by

κ̃=u1sκu22+u2s+κu1τu32+u3s+τu22ΩΣΩ.(4.13)

Also, from Eqs. 4.12, 4.13 the principal normal vector of the curve C̃ becomes

ñ=u1sκu2Σt+u2s+κu1τu3Σn+u3s+τu2Σb.(4.14)

Thus, Eqs. 4.11, 4.14 Imply

b̃=v1t+v2n+v3b,(4.15)

where

v1=Σ1u2u3s+τu2u3u2s+κu1τu3,v2=Σ1u1u3s+τu2+u3u1sκu2,v3=Σ1u1u2s+κu1τu3u2u1sκu2

and its derivative with respect to s̃ gives

τ̃=ΞΩΣ,(4.16)

where we put

Ξ=u1sκu2v1sκv2+u2s+κu1τu3v2s+κv1τv3+u3s+τu2v3s+τv3.

Suppose that the flows of the curves C and C̃ are governed by the same integrable system, that is, the curve C̃ also fulfills the geometric flow of the visco-Da Rios equation for the third frame as follows:

C̃t=τ̃t̃+wñ+κ̃b̃.(4.17)

Then, the Bäcklund transformation of the geometric flow of the visco-Da Rios equation for the third frame with the help of Eqs. 4.10, 4.11, 4.13.16.–.4.4.16 turns out to be the following result.

Theorem 8. The geometric flow Eq. 3.23 of the visco-Da Rios equation for the third frame in 3-dimensional Riemannian manifold is invariant with respect to the Bäcklund transformation Eq. 4.17 if ρ, σ and ς satisfy the system

ρt+τ+στsκw12ςκ2+τ2=1ΩΣΞu1+wΩu1sκu2+v1Σ2,σt+w+ρτs+κwςκs+τw=1ΩΣΞu2+wΩu2s+κu1τu3+v2Σ2,ςt+κ+σκs+τw+12ρκ2+τ2=1ΩΣΞu3+wΩu3s+τu2+v3Σ2.

5 Conclusion

One of classical nonlinear differential equations integrable by through inverse scattering transform is the Da Rios equation. In this study, we consider the visco-Da Rios equation Ct=CsDdsCs+wCs with the viscosity w of a space curve in a 3-dimensional Riemannian manifold. From this, we show that the visco-Da Rios equation of two classes of the space curve in a 3-dimensional Riemannian manifold with constant sectional curvature is geometric equivalent to the nonlinear Schrödinger equation by using modified Hasimoto transformations, and we also give the Bäcklund transformations of space curves with the visco-Da Rios equation.

Data Availability Statement

The original contributions presented in the study are included in the article/Supplementary Material, further inquiries can be directed to the corresponding author.

Author Contributions

DY gave the idea of establishing Visco Da Rios equation in Riemannian manifold and DY and NG checked and polished the draft.

Funding

NG is supported by the Scientific Research Agency of Eskisehir Osmangazi University (ESOGU BAP Project number: 202 019 016) and DY was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2021R1A2C101043211).

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s Note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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Keywords: Da rios equation, hasimoto transformation, time evolution, schrödinger equation, bäcklund transformation

Citation: Gürbüz NE and Yoon DW (2022) Visco-Da Rios Equation in 3-Dimensional Riemannian Manifold. Front. Phys. 9:810920. doi: 10.3389/fphy.2021.810920

Received: 08 November 2021; Accepted: 24 December 2021;
Published: 31 January 2022.

Edited by:

Mihai Visinescu, Horia Hulubei National Institute for Research and Development in Physics and Nuclear Engineering (IFIN-HH), Romania

Reviewed by:

Mohamd Saleem Lone, University of Kashmir, India
Ovidiu Cristinel Stoica, Horia Hulubei National Institute for Research and Development in Physics and Nuclear Engineering (IFIN-HH), Romania

Copyright © 2022 Gürbüz and Yoon. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Dae Won Yoon, dwyoon@gnu.ac.kr

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