Network caches are the storage centers in the supply chain for content delivery---the digital equivalent of warehouses. Operated by access networks and other operators, they provide benefits to content publishers in the forms of bandwidth cost reduction, response time improvement, and handling...

Network congestion remains one of the main barriers to the continuing success of the internet and Web based services. In this background, proxy caching is one of the most successful solutions for civilizing the performance of Web since it reduce network traffic, Web server load and improves user...

We focus on rating of non-life insurance contracts. We employ multiplicative models with basic premium levels and specific surcharge coefficients for various levels of selected risk/rating factors. We use generalized linear models (GLM) to describe the probability distribution of total losses...

The paper analyses, by applying a system of optimization models for cash flow analysis and forecasting, how effective a transfer of a part of the power generating capacities from gas to coal would be. We present a scenario analysis assuming both an increase of a gas export under a deficit of the...

In diesem Beitrag wird der Frage nachgegangen, inwieweit Optimierungsansätze wie lineare Programmierungsmodelle geeignet sind, bessere Entscheidungen als reale Entscheider zu treffen. Auch beleuchtet werden Unterschiede im Entscheidungsverhalten und in den Produktionsstrategien. Dazu lassen wir...

In this paper, a model that assists developers to evaluate and compare alternative reuse scenarios in software product line (SPL) development systematically in proposed. The model can identify basic activities (abstracted as operations) and precisely relate cost and reliability with each basic...

This technical note is divided into two parts. The first one investigates the necessity to explicitly incorporate spills into reservoir optimization models based on linear or nonlinear programming and presents a scheme to accomplish this task. The second part shows how reservoir optimization...

The identification of unknown pollution sources is a prerequisite for designing of a remediation strategy. In most of the real world situations, it is difficult to identify the pollution sources without a scientifically designed efficient monitoring network. The locations of the contaminant...

Multi-reservoir operation planning is a complex task involving many variables, objectives, and decisions. This paper applies a hybrid method using genetic algorithm (GA) and linear programming (LP) developed by the authors to determine operational decisions for a reservoir system over the...

Dynamic factor modelling aimed to identify the evolution of the economic activity has been widely used in several industrialized countries. Though the high adaptability of such methodologies to scarcity information contexts, results may present a lack of robustness. The purpose of this paper is...