$\left\{ \begin{aligned} & {t_0}{a_{ - 2,k}} + {t_{\rm{L}}}{d_{{\rm{L}},k}} = E{a_{ - 1,k}}, \\ &\tau {d_{1,{\rm{A}},k}} + {t_{\rm{L}}}{a_{ - 1,k}} = E{d_{L,k}}, \\ & \tau {d_{{\rm{L}},k}} + \upsilon {d_{1,{\rm{B}},k}} = E{d_{1,{\rm{A}},k}}, \\ &\upsilon {d_{n - 1,{\rm{A}},k}} + \omega {d_{n,{\rm{A}},k}} = E{d_{n - 1,{\rm{B}},k}},n \geqslant 2, \\ &\upsilon {d_{n,{\rm{B}},k}} + \omega {d_{n - 1,{\rm{B}},k}} = E{d_{n,{\rm{A}},k}},n \geqslant 2, \\ & \upsilon {d_{N,{\rm{A}},k}} + \tau {d_{{\rm{R}},k}} = E{d_{N,{\rm{B}},k}}, \\ & \tau {d_{N,{\rm{B}},k}} + {t_{\rm{R}}}{a_{1,k}} = E{d_{{\rm{R}},k}}, \\ & {t_{\rm{R}}}{d_{{\rm{R}},k}} + {t_0}{a_{2,k}} = E{a_{1,k}}\,. \end{aligned} \right.$![]() ![]() | (9) |