Algorithms to define limits for wood property categorization

Grading is the attempt to allocate objects to predefined categories in order to obtain groups that are homogeneous. These categories are only defined by their limits and therefore the definition of the category limits is a crucial factor in the establishment of grading rules. Log grading is the basis for a meaningful and cost-optimal use of wood and can be conducted by various methods depending on the specific utilization and end product. In this paper a new approach for the calculation of the limits between categories of wood properties is shown. Algorithms were developed based on the principles of the analysis of variance (ANOVA) and adopted according to the specific demands of the categorization procedure. Categorization was carried out for roundwood features, and it was shown that the algorithms fulfill the set of requirements. The method shown is promising for the support of the definition of limits in the development of norms and standards. In particular, existing grading rules could not be applied satisfactorily to the investigated data set and the application of the algorithm led to significantly better results. On a company level, the method developed can be applied to define limits between quality grades of raw materials based on quality measures for the final product.

You must be logged in to download any documents. Please login (login accounts are free) or learn how to Become a Member