"OpenStreetMap kreira i pruža slobodne geografske podatke, kao sto su karte gradova i naselja svakome tko ih želi. Projekt je nastao iz razloga sto vecina karata za koje mislite da su slobodne za koristenje, ustvari imaju pravna ili tehnicka ogranicenja za njihovu uporabu, sto sprijecava ljude da ih koriste na kreativne, produktivne te neocekivane nacine."

Open Street Map

Bayesian Analytics for Estimating Risk Probability in PPP Waste-to-Energy Projects

Mountain railway alignment optimization is known as a very complex engineering problem that should consider many factors, such as drastically undulating terrain, geological hazard impacts,...

Bi‐objective mountain railway alignment optimization incorporating seismic risk assessment

In this paper we review the literature on multi-component maintenance models with economic dependence. The emphasis is on papers that appeared after 1991, but there is an overlap with Section 2 of the most recent review paper by Cho and Parlar (1991). The classification scheme that we choose is primarily based on the various options of grouping maintenance activities: grouping either corrective or preventive maintenance actions, or combining preventive maintenance activities with corrective actions. As such, this classification links up with the possibilities for grouped maintenance activities that exist in practice.

A Review of Multi-Component Maintenance Models with Economic Dependence

textA railway system needs a substantial amount of maintenance. To
prevent unexpected breakdowns as much as possible, preventive
maintenance is required. In this paper we discuss the Preventive
Maintenance Scheduling Problem (PMSP), where (short) routine
activities and (long) unique projects have to be scheduled in a
certain period. To reduce costs and inconvenience for the
travellers and operators, these activities have to be scheduled as
much as possible together. We present a mathematical formulation
for this problem and some greedy heuristics to solve it fast.
Moreover, we compare the performance of these heuristics with the
optimal solution using some randomly generated instances.

/pdf/scheduling-preventive-railway-maintenance-activities-2qhllwoyzd.pdf

Scheduling preventive railway maintenance activities

A road network consists of multiple objects that deteriorate over time with different speeds of deterioration. In order to provide an adequate level of service over time, these objects will...

Determining an Optimal Set of Work Zones on Large Infrastructure Networks in a GIS Framework

The determination of the optimal interventions to execute on rail infrastructure networks is a challenging task, due to the many types of objects (e.g., bridges, tracks, and switches), how the objects work together to provide service, and the possible reductions in costs and service disruptions as obtained by grouping interventions. Although railway infrastructure managers are using computer systems to help them determine intervention programs, there are none that result in the highest net benefits while taking into consideration all of these aspects. This paper presents a network flow model approach that allows for determining the optimal intervention programs for railway infrastructure networks while taking into considerations different types of objects, how the objects work together to provide service, and object and object-traffic dependencies. The network flow models are formulated as mixed integer linear programs, where the optimal intervention program is found by using the simplex and branch and bound algorithms. The modelling approach is illustrated by using it to determine the optimal intervention program for a 2200 m multi-track railway line consisting of 11 track sections, 23 switches, and 39 bridges. It is shown that the proposed constrained network flow model can be used to determine the optimal intervention program within a reasonable amount of time, when compared to more traditional models and search algorithms.

https://www.mdpi.com/2412-3811/3/3/31/pdf

A Network Flow Model Approach to Determining Optimal Intervention Programs for Railway Infrastructure Networks

The difficulties of engineers and managers agreeing on how to invest in infrastructure maintenance stem from a basic inability to communicate with each other. This leads to the suboptimal managemen...

/pdf/estimating-and-communicating-the-risk-of-neglecting-4xfexsto0j.pdf

Estimating and communicating the risk of neglecting maintenance

Because failures on railway lines have nonzero probabilities of occurrence and can result in significant costs if they occur, railway infrastructure managers are interested in determining i...

Determination of Risk-Reducing Intervention Programs for Railway Lines and the Significance of Simplifications

Road infrastructure asset management requires making decisions that affect how infrastructure provides service – for example, the intervention strategies to follow for specific assets, the interven...

https://www.icevirtuallibrary.com/doi/pdf/10.1680/jinam.18.00045

Marcel Burkhalter

Papers

Determining an Optimal Set of Work Zones on Large Infrastructure Networks in a GIS Framework

A Network Flow Model Approach to Determining Optimal Intervention Programs for Railway Infrastructure Networks

Estimating and communicating the risk of neglecting maintenance

Determination of Risk-Reducing Intervention Programs for Railway Lines and the Significance of Simplifications

Defining road service to facilitate road infrastructure asset management