Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Spatially constrained harvest scheduling for strip allocation under Moore and Neumann neighbourhood adjacency. | JOURNAL OF FOREST SCIENCE 57 2011 2 70-77 Spatially constrained harvest scheduling for strip allocation under Moore and Neumann neighbourhood adjacency M. Konoshima1 R. Marusák2 a. Yoshimoto3 ỵ Graduate School of Life Sciences Tohoku University Aoba Sendai Japan 2Faculty of Forestry and Wood Sciences Czech University of Life Sciences Prague Prague Czech Republic Department of Mathematical Analysis and Statistical Inference The Institute of Statistical Mathematics Tachikawa Tokyo Japan ABSTRACT Adjacency constraints can be represented by Moore or Neumann neighbourhood adjacency depending upon how candidate neighbours are assigned at corners adjacent to the target cell. Considering Moore and Neumann neighbourhood adjacency we investigate the effect of strip cutting under a shelterwood management scheme with adjacency requirements among strips. We compare the effect of creating a strip window within a management unit with the same spatially constrained problem without a strip window. The management scheme comparison is considered as a spatially constrained harvest scheduling problem which is solved with CPLEX software using an exact solution method. Our experimental analysis shows that the inclusion of additional spatial consideration by strip window creation in the management scheme results in a reduction of the total harvest volume by almost 13 under Moore neighbourhood adjacency while it has a small effect under Neumann neighbourhood adjacency. Keywords integer programming Moore and Neumann neighbourhood adjacency Shelterwood management strip cutting Consideration of adjacency constraints has been a key issue in harvest scheduling over the last several decades because of environmental ecological and aesthetic requirements. These constraints are often expressed by Moore neighbourhood adjacency in ecological fields where all neighbours sharing adjacent lines and corners with the target cell are considered adjacent. In forest management on the other hand Neumann .
