General Boundary Value Problems of the Korteweg-de Vries Equation on a Bounded Domain

In this paper we consider the initial boundary value problem of the Korteweg-de Vries equation posed on a finite interval \begin{equation} u_t+u_x+u_{xxx}+uu_x=0,\qquad u(x,0)=\phi(x), \qquad 0<x<L, \ t>0 \qquad (1) \end{equation} subject to the nonhomogeneous boundary conditions, \begin{equation} B_1u=h_1(t), \qquad B_2 u= h_2 (t), \qquad B_3 u= h_3 (t) \qquad t>0 \qquad (2) \end{equation} where $$B_{i}u=\sum _{j=0}^2(a_{ij}{\mathrm{\partial }}_x^{j}u(0,t)+b_{ij}{\mathrm{\partial }}_x^{j}u(L,t)),i=1,2,3,$$ and $a_{ij},
b_{ij}$ $(j,i=0,1,2,3)$ are real constants. Under some general assumptions imposed on the coefficients $a_{ij},b_{ij}$, $j,i=0,1,2,3$, the IBVPs (1)-(2) is shown to be locally well-posed in the space $H^s(0,L)$ for any $s\ge 0$ with $\varphi \in H^s(0,L)$ and boundary values $h_j,j=1,2,3$ belonging to some appropriate spaces with optimal regularity.