Bitmaps are popular indexes for Data Warehouse (DW) applications and most database management systems (DBMSs) ooer them today. This paper analyzes query optimization issues for selection operations using bitmaps. Both continuous and discrete selection criteria are considered. Query optimization is categorized into static and dynamic optimization. The static optimization issues discussed are the...

In this paper we suggest a multi-start greedy heuristic for a real-life truck and trailer routing problem. The considered problem is a site dependent heterogeneous fleet truck and trailer routing problem with soft and hard time windows and split deliveries. This problem arises in delivering goods from a warehouse to stores of a big retail company. There are about 400 stores and 100 vehicles for...

Domestic dogs and cats are commonly infected with a variety of protozoan enteric parasites, including Blastocystis spp. In addition, there is growing interest in Blastocystis as a potential enteric pathogen, and the possible role of domestic and in-contact animals as reservoirs for human infection. Domestic animals in shelter environments are commonly recognized to be at higher risk for carriag...

Faced with increasing competitive pressures, a logistics company in the United States sought to reduce its cost structure by implementing two information systems. The Labor Management System (LMS) was specifically designed to improve warehouse worker efficiency and the Radio Frequency Identification (RFID) system tracked the movement of products, pallets, and shipment. This case presents an ove...

Warehouses are junction points in the supply chain. To avoid disruptions chain flow, materials stored warehouse must be safely protected and made available for next transportation activity. Warehouse personnel critical ensuring full-time material flow. For administrative dimension, managers leaders responsible successful execution of all input-output processes. Therefore, a manager is needed op...

The queries defined on data warehouses are complex and use several join operations that induce an expensive computational cost. This cost becomes even more prohibitive when queries access very large volumes of data. To improve response time, data warehouse administrators generally use indexing techniques such as star join indexes or bitmap join indexes. This task is nevertheless complex and fas...

Generally, research that dealt with the selection problems for optimization techniques or structures in relational data ware houses supports these problems by considering only a single criterion of optimization. The optimization criteria may be the response time of query execution, the number of inputs/outputs between the main memory and the disk, the space allocated to store the index or mater...

The design and configuration of a data warehouse can be difficult tasks especially in the case of very large databases and in the presence of redundant information. In particular, the choice of which attributes have to be considered as dimensions and measures can be not trivial and it can heavily influence the effectiveness of the final system. In this article, we propose a methodology targeted...

Her y?l birçok insan çe?itli afet türleri ile kar?? kar??ya kalmaktad?r. Afet lojisti?i çerçevesinde, afetzedelerin bar?nma sorununu çözmek ad?na geçici alanlar?n?n yerlerinin öncesinde belirlenmesi gerekmektedir. sonras? seçimi ele al?nan problemin ana amac?n? olu?tururken, bu problem gerek Türkiye’nin ba?kenti, gerekse 2. büyük kenti olmas?ndan ötürü Ankara ili üzerinde Bulan?k TOPSIS tekni?i...

Usually, a data warehouse is refreshed periodically with data gathered from disparate source systems. Nevertheless this data might not be fully accurate, probably containing serious data quality problems, such as uniqueness, misrepresentations, null values, multi-purpose fields, or inconsistent values, for one or more attributes. This is a major contribution to the falling expectations users ha...