Forecast reconciliation is a post-forecasting process aimed to improve the quality of base forecasts for system hierarchical/grouped time series. Cross-sectional and temporal hierarchies have been considered in literature, but generally, these two features not fully together. The paper presents new results by adopting notation that simultaneously deals with both forecast dimensions. (i) closed-...

Data Envelopment Analysis (DEA) as a non–parametric method is used to measure relative performance of organizational units. The aim of this paper is to develop a new model to evaluate the efficiency of a general two-stage network structures proposed by Li et al.  (2012) for measuring the performance of Decision Making Units (DMUs). In addition, this paper expands the work of Li et al. (2012) an...

of Section II Section II, "A Comparative Study of Heuristic Reliability Optimization Methods" investigates the effectiveness of a mixed-integer programming method. This method is a combination of the heuristic redundancy method and the sequential search method. The heuristic method determines the integer variables (number of redundancies) by assuming that the real variables (reliability level) ...

We describe a hybrid meta-heuristic algorithm for combinatorial optimization problems with a specific reference to the travelling salesman problem (TSP). The method is a combination of a genetic algorithm (GA) and greedy randomized adaptive search procedure (GRASP). A new adaptive fuzzy a greedy search operator is developed for this hybrid method. Computational experiments using a wide range of...