By-products and waste materials are potentially valuable inputs into a variety of industrial processes. Markets are being aimed at capitalizing on the use and reuse of these materials as inputs. The literature on reverse logistics analysis mostly concentrates on the end-of-life products recovery systems and mainly does not address the recovery process for waste/by-products streams in an exchang...

Patch management is a crucial component of IT security programs. An important problem within this context is to determine how often to update the systems with necessary patches. Keeping the systems patched with more frequent patch updates increases operational costs while reducing security risks. On the other hand, leaving the systems unpatched with less frequent patch updates decreases operati...

In cloud computing, software applications are potentially able to use only the computing resources that are minimally needed for performant operation. Because cloud providers provision such resources on a pay-per-use basis, software architects are interested in analyzing the operational costs that accrue for such applications, allowing architects to optimize for cost-efficiency. Current analysi...

Disruption management is one of the most important scheduling problems in the airline industry because of the elevated costs associated, however this is relatively new research area comparing for example with fleet and tail assignment. The major goal to solve this kind of problem is to achieve a feasible solution for the airline company minimizing the several costs involved and within time cons...

The Airline Operations Control Center (AOCC) tries to solve unexpected problems that might occur during the airline operation. Problems related to aircrafts, crewmembers and passengers are common and the actions towards the solution of these problems are usually known as operations recovery. In this paper we present the implementation of a Distributed Multi-Agent System (MAS) representing the e...

In this paper, an inventory management framework and deterministic costs models within the context of this framework are structured for effective supply chain under deterministic and fuzzy environment. In this regard, we propose a bi-echelon multi-product supply chain in which a central manufacturing firm (lower echelon) with warehouse space limitation is fed through different suppliers (upper ...

This paper provides a detailed analysis and modelling of the Operational Expenditures (OPEX) for a network provider. The traditional operational processes are elaborated and the expected changes when using a control plane such as ASON/GMPLS are described. Control planes are promoted as a major technology for the automation of network operations. It is often claimed to allow the reduction of OPE...

This paper provides a detailed analysis and modelling of the Operational Expenditures (OPEX) for a network provider. The traditional operational processes are elaborated and the expected changes when using GMPLS are described. GMPLS is promoted as a major technology for the automation of network operations. It is often claimed to allow the reduction of OPEX. However, detailed analysis and quant...

The international experience demonstrates that, the best water and sewerage services are those where the cost are fully paid for by the consumer, through the establishment of tariffs. This includes investment costs and operational costs. Whenever the tariffs are settled below the full service costs either the tax-payers end up paying the bill, thus subsidizing inefficient service providers or, ...

A load plan specifies how freight is routed through a linehaul terminal network operated by a less-than-truckload (LTL) motor carrier. Determining the design of the load plan, a problem of service network design, is critical to effective operations of such carriers. Operations research techniques currently support load plan design, and all models in use or proposed today approximate transportat...