Lexicographic solution of two-objective project planning problem under constrained reliability index

2014 ◽  
Vol 53 (6) ◽  
pp. 877-895 ◽  
Author(s):  
V. V. Topka
2012 ◽  
Vol 271-272 ◽  
pp. 1427-1433
Author(s):  
Hui Liu ◽  
Jian Ping Hao

In order to solve the planning problem of maintainability growth project, study of the model and algorithm in linear programming of maintainability growth project is put forward. Firstly, the linear relationship of factor and target as an example, the mathematical model of maintainability growth project planning is put forward in the article, and a general solution method is mentioned. Then according to the maintainability growth problem’s characteristic, the algorithm is improved. A solution method is brought out which is about simplex method with variable changed form 0 to 1- γi. This Algorithm makes the solution of maintainability growth project planning become much simpler than before.


Author(s):  
Dianqing Li ◽  
Shengkun Zhang ◽  
Wenyong Tang

A theoretical framework of risk based optimal inspection and repair planning is proposed for the ship structures subjected to corrosion deterioration. The planning problem is formulated as an optimization problem where the expected lifetime costs were minimized with a constraint on the minimum acceptable reliability index. The safety margins are established for the inspection events, the repair events and the failure events for ship structures. Moreover, the formulae are derived to calculate failure probabilities and repair probabilities. Based on them, a component subjected to pitting corrosion is investigated to illustrate the process of selecting the optimal inspection and repair strategy. Furthermore, some sensitivity studies were provided. The results show that the optimal inspection instants should take place before the reliability index reaches the minimum acceptable reliability index. The optimal target failure probability is 10−3. In addition, a balance can be achieved between the risk cost and total expected inspection and repair costs by using the risk based optimal inspection and repair method, which is very effective in selecting the optimal inspection and repair strategy.


2021 ◽  
Vol 20 (4) ◽  
pp. 573-579
Author(s):  
Egor V. Dudukalov ◽  
Elena Yu. Zolochevskaya ◽  
SvetlanaG. Zubanova ◽  
OlegS. Kharlamov ◽  
ElenaV. Skripleva ◽  
...  

Water ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1977 ◽  
Author(s):  
Boris Po-Tsang Chen ◽  
Chang-Shian Chen

In order to estimate water supply potential, the effects of shortages on water users, and the uncertainty of local headspring conditions during the planning stage of reservoir construction, the Shortage Index (SI) is often employed. However, the criterion used in the SI is difficult to adjust to satisfy local conditions and objectives. The SI also employs an ambiguous definition of value. Thus, this study adopted a water supply reliability index (WSRI) as an alternative to the SI for providing the criterion for water resources project planning. The value of the WSRI is easily understood, because it is defined according to the real water supply situation and it has a strong linear relationship with values of SI. For any given water supply system, the estimated results derived from this study could serve as an additional remark on different SI values to explain the relevant water supply considerations. In addition, for a new planning site, the estimated results of this study could provide another way for engineers to evaluate the maximum water supply capability. Consequently, an interesting avenue of investigation in future research would be the incorporation of the WSRI with the risk of deficit frequency in establishing an efficient and transparent bottom-up approach for water resources management, involving all the relevant stakeholders.


2009 ◽  
Vol 15 (4) ◽  
pp. 523-539 ◽  
Author(s):  
Tomasz Błaszczyk ◽  
Maciej Nowak

Several criteria must be considered while preparing the schedule of a construction project. The completion time and project cost are analyzed in most cases. Additionally, the risk related to the criteria has to be taken into account as well. Thus, project planning problem can be denned as a multicriteria decision problem under risk. In this paper, a project scheduling problem including time‐cost trade‐offs is analyzed. We assume that various resource allocations can be considered. A new technique based on computer simulation and interactive approach is proposed. In the first step, simulation experiments are performed to evaluate decision alternatives with respect to the criteria. An interactive technique INSDECM is employed for generating the final solution of the problem. The procedure uses stochastic dominance rules for comparing decision alternatives with respect to the criteria. A numerical example is presented to illustrate the applicability of the technique. Santrauka Rengiant statybos projekto įvykdymo grafiką reikia įvertinti keletą kriterijų. Daugeliu atvejų analizuojamas projekto baigimo laikas ir sąmatinė kaina. Taip pat gali būti įvertinama rizika. Taigi projekto planavimo problema gali būti apibūdinama kaip daugiakriterinė sprendimo problema įvertinant riziką. Straipsnyje analizuojama projekto planavimo problema, suderinant projekto įvykdymo laiką ir kainą. Remiamasi prielaida, kad galimi įvairūs išteklių paskirstymai. Pasiūlyta nauja metodologija, pagrįsta kompiuteriniu modeliavimu ir interaktyvaus metodo taikymu. Pirmuoju etapu imitaciniais modeliais įvertinamos sprendimo alternatyvos. Antruoju etapu galutiniam problemos sprendimui taikoma interaktyvi INSDECM metodologija. Šioje procedūroje, siekiant palyginti sprendimo alternatyvas pagal kriterijus, taikomos stochastinės dominavimo taisyklės. Naujos metodologijos taikymą iliustruoja skaitmeninis pavyzdys.


Author(s):  
Totska Olesia ◽  
Glovatsky Anastasia

The purpose of the article is to plan a project of an electric vehicle technicalassistance point. the methodology of the study is to use the critical path method.the scientific novelty of the obtained results is that the article describes the practicalaspects of project planning of the creation of an electric vehicle technical assistancepoint. In particular, the tasks of the project are described, labor, material and financialresources necessary for its realization are specified. conclusions. The implementationof the developed project will effectively manage the content, time and resources ofthe project of the creation of an electric vehicle technical assistance point.


2019 ◽  
Vol 8 (4) ◽  
pp. 9449-9456

This paper proposes the reliability index of wind-solar hybrid power plants using the expected energy not supplied method. The location of this research is wind-solar hybrid power plants Pantai Baru, Bantul, Special Region of Yogyakarta, Indonesia. The method to determine the reliability of the power plant is the expected energy not supplied (EENS) method. This analysis used hybrid plant operational data in 2018. The results of the analysis have been done on the Pantai Baru hybrid power plant about reliability for electric power systems with EENS. The results of this study can be concluded that based on the load duration curve, loads have a load more than the operating kW of the system that is 99 kW. In contrast, the total power contained in the Pantai Baru hybrid power plant is 90 kW. This fact makes the system forced to release the load. The reliability index of the power system in the initial conditions, it produces an EENS value in 2018, resulting in a total value of 2,512% or 449 kW. The EENS value still does not meet the standards set by the National Electricity Market (NEM), which is <0.002% per year. Based on this data, it can be said that the reliability of the New Coast hybrid power generation system in 2018 is in the unreliable category.


2020 ◽  
Vol 10 (1) ◽  
pp. 86-99
Author(s):  
Lewis Tsuro ◽  
Stan Hardman

The Soft Systems Methodology (SSM) was developed as a set of tools for identifying and making incremental steps to improve situations with poorly defined causes or solutions. The supply chain forms a key process of any construction project; however, on any given construction site, supply chain inefficiencies could arise from many different avenues. Opinions vary, though, on which of these avenues is more important for increasing supply chain efficiencies; whether any problem even exist across the different aspects of the supply chain; as well as what steps should be taken to resolve them. It was therefore studied, here, whether SSM could be employed as a useful tool to systematically apply in the supply chains of a construction project in South Africa, for understanding and targeting the problematic situations that arise. Following thorough cyclical open-ended interviews with 17 workers, supervisors, foremen, site clerks, senior managers, and the CEO of the principal contractor at a new office park construction project in Rosebank, Johannesburg, and a thematic analysis of the data, SSM was performed to understand the existing challenges, and develop a suitable model for improvement. The study found that SSM was a good tool for understanding the ‘messy’ circumstances surrounding the chosen construction project supply chain, as well as actions that could be taken to improve the supply chain’s efficiency on site. The findings add weight to the argument that SSM could be a good tool for project managers to systematically introduce into their project planning regimens


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