def METHOD_NAME(self):
    """
    @brief Determine boundary cells in the 1D structure mesh.
    @return isBdCell : np.array, dtype=np.bool_
        An array of booleans where True indicates a boundary cell.
    """
    isBdCell = np.zeros((NC,), dtype=np.bool_)
    isBdCell[0] = True
    isBdCell[-1] = True
    return isBdCell 