29 research outputs found
Fast truck-packing of 3D boxes
We present formulation and heuristic solution of a container packing problem
observed in a household equipment factory鈥檚 sales and logistics department. The main
feature of the presented MIP model is combining several types of constraints following
from the considered application field. The developed best-fit heuristic is tested on
the basis of a computational experiment. The obtained results show that the heuristic
is capable of constructing good solutions in a very short time. Moreover, the approach
allows easy adjustment to additional loading constraints
Handling the description noise using an attribute value ontology
The quality of any classifier depends on a number of factors, including the quality of training data. In real-world scenarios, data are often noisy. One reason for noisy data (erroneous values) is in the representation language, insufficient to model different levels of knowledge granularity. In this paper, to address the problem of such description noise, we propose a novel extension of the na've Bayesian classifier by an attribute value ontology (AVO). In the proposed approach, every attribute is a hierarchy of concepts from the domain knowledge base. In this way an example is described either very precisely (using a concept from the low-level of the hierarchy) or, when it is not possible, in a more general way (using a concept from higher levels of the hierarchy). Our general strategy is to classify a new example using training examples described in the same way or more precisely at lower levels of knowledge granularity. Hence, the hierarchy introduces a bias which in effect can contribute to improvement of a classification