From LillebÆLt to ØResund: Durability Design and Maintenance Strategies for the Danish Strait Crossings

2003 ◽  
pp. 267-286
Author(s):  
M W Braestrup ◽  
A Knudsen
Keyword(s):  
Maintenance Strategies ◽  
Danish Strait ◽  
Durability Design

CARBONATION INDUCED CORROSION ANALYSIS OF REINFORCED CONCRETE STRUCTURES BASED ON FULL PROBABILISTIC APPROACH – AN INDONESIAN CASE STUDY

2018 ◽  
Vol 4 (1) ◽  
pp. 165
Author(s):  
Herry Prabowo ◽  
Mochamad Hilmy
Keyword(s):  
Service Life ◽  
Probabilistic Approach ◽  
Concrete Structures ◽  
Weather Condition ◽  
Analysis Data ◽  
National Standard ◽  
Concrete Carbonation ◽  
Durability Design ◽  
Starting Point ◽  
Real Performance

The assessment of the service life of concrete structures using the durability design approach is widely accepted nowadays. It is really encouraged that a simulation model can resemble the real performance of concrete during the service life. This paper investigates the concrete carbonation through probabilistic analysis. Data regarding Indonesian construction practice were taken from Indonesian National Standard (SNI). Meanwhile, data related to Indonesian weather condition for instance humidity and temperature are taken from local Meteorological, Climatological, and Geophysical Agency from 2004 until 2016. Hopefully the results can be a starting point for durability of concrete research in Indonesia.

scholarly journals Bayesian maintenance decision optimisation based on computing the information value from condition inspections

2021 ◽  
pp. 1748006X2097812
Author(s):  
Guang Zou ◽  
Kian Banisoleiman ◽  
Arturo González
Keyword(s):  
Decision Making ◽  
Structural Integrity ◽  
Fatigue Cracking ◽  
Cost Effective ◽  
Offshore Structures ◽  
Information Value ◽  
Bayesian Decision ◽  
Maintenance Strategies ◽  
Optimal Maintenance ◽  
Maintenance Decision

A challenge in marine and offshore engineering is structural integrity management (SIM) of assets such as ships, offshore structures, mooring systems, etc. Due to harsh marine environments, fatigue cracking and corrosion present persistent threats to structural integrity. SIM for such assets is complicated because of a very large number of rewelded plates and joints, for which condition inspections and maintenance are difficult and expensive tasks. Marine SIM needs to take into account uncertainty in material properties, loading characteristics, fatigue models, detection capacities of inspection methods, etc. Optimising inspection and maintenance strategies under uncertainty is therefore vital for effective SIM and cost reductions. This paper proposes a value of information (VoI) computation and Bayesian decision optimisation (BDO) approach to optimal maintenance planning of typical fatigue-prone structural systems under uncertainty. It is shown that the approach can yield optimal maintenance strategies reliably in various maintenance decision making problems or contexts, which are characterized by different cost ratios. It is also shown that there are decision making contexts where inspection information doesn’t add value, and condition based maintenance (CBM) is not cost-effective. The CBM strategy is optimal only in the decision making contexts where VoI > 0. The proposed approach overcomes the limitation of CBM strategy and highlights the importance of VoI computation (to confirm VoI > 0) before adopting inspections and CBM.

scholarly journals Fleet Resilience: Evaluating Maintenance Strategies in Critical Equipment

2020 ◽  
Vol 11 (1) ◽  
pp. 38
Author(s):  
Orlando Durán ◽  
Javier Aguilar ◽  
Andrea Capaldo ◽  
Adolfo Arata
Keyword(s):  
Application Study ◽  
System Availability ◽  
Maintenance Strategies ◽  
Resilience Index ◽  
Reliability Block Diagrams ◽  
Maintenance Policies ◽  
Definition Of ◽  
The Impact ◽  
Important System ◽  
Intrinsic Characteristic

Resilience is an intrinsic characteristic of systems. Through it, the capacity of a system to react to the existence of disruptive events is expressed. A series of metrics to represent systems’ resilience have been proposed, however, only one indicator relates the availability of the system to this characteristic. With such a metric, it is possible to relate the topological aspects of a system and the resources available in order to be able to promptly respond to the loss of performance as a result of unexpected events. This work proposes the adaptation and application of such a resilience index to assess the influence of different maintenance strategies and topologies in fleets’ resilience. In addition, an application study considering an actual mining fleet is provided. A set of critical assets was identified and represented using reliability block diagrams. Monte Carlo simulation experiments were conducted and the system availability data were extracted. Resilience indexes were obtained in order to carry out the definition of the best maintenance policies in critical equipment and the assessment of the impact of modifying system redundancies. The main results of this work lead to the overall conclusion that redundancy is an important system attribute in order to improve resiliency along time.

Maintaining Effects of Pulmonary Rehabilitation at Home in Chronic Obstructive Pulmonary Disease: A Systematic Literature Review

2021 ◽  
pp. 108482232199037
Author(s):  
Duarte Pinto ◽  
Lissa Spencer ◽  
Soraia Pereira ◽  
Paulo Machado ◽  
Paulino Sousa ◽  
...  
Keyword(s):  
Chronic Obstructive Pulmonary Disease ◽  
Literature Review ◽  
Pulmonary Rehabilitation ◽  
Rehabilitation Program ◽  
Chronic Obstructive ◽  
Obstructive Pulmonary Disease ◽  
Maintenance Strategies ◽  
Rehabilitation Programs ◽  
Home Based ◽  
Pulmonary Rehabilitation Program

To systematize strategies that may support patients with Chronic Obstructive Pulmonary Disease to maintain the effects of pulmonary rehabilitation over time. This systematic literature review was conducted, and the evidence was electronically searched in the Web of Science, Scopus, and EBSCO databases. This review included randomized controlled clinical trials, published until September 2019, that addressed components of an unsupervised home-based pulmonary rehabilitation program, maintenance strategies following outpatient pulmonary rehabilitation programs, as well as data on outcomes for quality of life, exercise performance, and dyspnea. A final sample of 5 articles was obtained from a total of 1693 studies. Data for final synthesis were grouped into 2 categories: components of unsupervised home-based pulmonary rehabilitation programs and maintenance strategies. An unsupervised home-based pulmonary rehabilitation program should consist of an educational component, an endurance training component, and a strength training component. When patients are transferred to the home environment, it is important to include more functional exercises specifically adapted to the patient’s condition, goals, and needs.

scholarly journals Special Issue “Advances in Machine Learning and Deep Learning Based Machine Fault Diagnosis and Prognosis”

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 532
Author(s):  
Mohand Djeziri ◽  
Marc Bendahan
Keyword(s):  
Machine Learning ◽  
Deep Learning ◽  
Fault Diagnosis ◽  
Special Issue ◽  
Maintenance Strategies ◽  
Corrective Maintenance ◽  
Diagnosis And Prognosis ◽  
Machine Fault Diagnosis ◽  
Failure Prognosis ◽  
Fault Diagnosis And Prognosis

Fault diagnosis and failure prognosis aim to reduce downtime of the systems and to optimise their performance by replacing preventive and corrective maintenance strategies with predictive or conditional ones [...]

scholarly journals Frontline Maintenance Treatment for Ovarian Cancer

2021 ◽  
Vol 23 (8) ◽  
Author(s):  
Osnat Elyashiv ◽  
Yien Ning Sophia Wong ◽  
Jonathan A. Ledermann
Keyword(s):  
Ovarian Cancer ◽  
Drug Resistance ◽  
Dna Repair ◽  
Maintenance Treatment ◽  
Advanced Disease ◽  
Disease Recurrence ◽  
Primary Treatment ◽  
New Paradigm ◽  
Maintenance Strategies ◽  
Advanced Epithelial Ovarian Cancer

Abstract Purpose of Review Advanced epithelial ovarian cancer remains the most lethal gynaecological cancer. Most patients with advanced disease will relapse within 3 years after primary treatment with surgery and chemotherapy. Recurrences become increasing difficult to treat due to the emergence of drug resistance and 5-year survival has changed little over the last decade. Maintenance treatment, here defined as treatment given beyond primary chemotherapy, can both consolidate the response and prolong the control of disease which is an approach to improve survival. Recent Findings Here we review maintenance strategies such as targeting angiogenesis, interference of DNA repair through inhibition of PARP, combinations of targeting agents, and immunotherapy and hormonal therapy. Summary Much has been learnt from the success and challenges of these treatments that have in the last few years which led to significant reduction in disease recurrence, changed the guidelines for treatment, and established a new paradigm for the treatment of ovarian cancer.

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