Warehouse is one of the important aspects of a company. Therefore, it is necessary to improve Warehouse Management System (WMS) to have a simple function that can determine the layout of the storage goods. In this paper we propose an improved warehouse layout method based on ant colony algorithm and backtracking algorithm. The method works on two steps. First, it generates a solutions parameter...

A data warehouse stores huge amounts of data collected from multiple sources and enables users to query that data for analytical and reporting purposes. Data in a data warehouse can be represented as a multidimensional cube. Data warehouse queries tend to be very complex, thus their evaluation requires long hours. Precomputing a proper set of the queries (building subcubes) may significantly re...

Assigning products to and retrieving them from proper storage locations are crucial in minimizing the operating cost of a unit-load warehouse. The problem becomes intractable when the warehouse faces variable supply and uncertain demand in a multi-period setting. We assume a factor-based demand model in which demand for each product in each period is affinely dependent on some uncertain factors...

Assigning products to and retrieving them from proper storage locations in a unit-load warehouse are crucial in minimizing its operating cost. The problem becomes intractable when the warehouse faces uncertain demand in a dynamic setting. We assume a factor-based demand model in which demand for each product in each period is affinely dependent on some uncertain factors. The distributions of th...

In this paper, a simulation study is carried out to identify potential improvements in the management of a nonautomated distribution warehouse which is located between manufacturers and small retailers. The simulation model has been used to obtain valuable knowledge of the operational characteristics of the warehouse. We aim at understanding the effect of an automatic storage upon the occupied ...

In the last years, huge efforts have been performed in developing innovative solutions to support warehouses automation. Although a variety of approaches addressed the performance evaluation of storage and retrieval systems, e.g., cycle time and machine utilization, no contribution has highlighted the sustainability of this class of systems yet. The aim of this work is to propose a methodology ...

There exist a number of mathematical problems in the literature concerning warehouse storage optimization. However, to the best of our knowledge the problem of finding optimal slot sizes in pallet rack system minimizing the occupied storage space is not studied. More precisely, the problem is to optimally choose k ofm pallet racks with pallets in a warehouse, find optimal slot sizes in pallet r...

The design process is the most considered task of a data warehouse designer, this because of its performance criticality while going to production. Even if technology has developed in term of memory volume and speed, storage... the fact to minimize the execution time and the storage space still being a preoccupation for data warehousing specialists. This papers shows that using bitmap index and...

Automated storage and retrieval systems (AS/RS) become frequently used systems in warehouses. There has been a transition from human based forklift applications to fast and safe AS/RS applications in firm’s warehouse systems. In this study, basic components and automation systems of the AS/RS are examined. Proposed system's automation components and their tasks in the system control algorithm w...

This paper describes how database systems can use and exploit a cost-effective active storage hierarchy. By active storage hierarchy we mean a database system that uses all storage media (i.e. optical, tape, and disk) to store and retrieve data and not just disk. We describe and emphasize the active part, whereby all storage types are used to store raw data that is converted to strategic busine...