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Wyświetlanie 1-12 z 12
Tytuł:
Insertion Algorithms with Justification for Solving the Resource-Constrained Project Scheduling
Autorzy:
Klimek, M.
Łebkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/375927.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
insertion algorithms
resource - constrained project scheduling problem
makespan minimisation
justification
forward scheduling
priority rules
Opis:
The paper presents the resource-constrained project scheduling problem with the makespan minimization criterion. To solve the problem, the authors propose insertion algorithms that generate schedules with the use of forward serial and parallel decoding procedures. Schedules are improved with the use of the double justification by the extremes technique (first right and then left justification). The efficiency of the procedures proposed is tested on standard test problems from the PSPLIB library.
Źródło:
Decision Making in Manufacturing and Services; 2016, 10, 1-2; 31-43
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust buffer allocation for scheduling of a project with predefined milestones
Autorzy:
Klimek, M.
Łebkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/375929.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
resource-constrained project scheduling
predictive-reactive scheduling
robust buffer allocation
milestones
Opis:
The paper discusses the problem of robust buffer allocation for Resource- Constrained Project Scheduling Problem (RCPSP) with predefined milestones(1) , for which execution deadlines have been established. To solve the problem, an algorithm is proposed supporting insertion of unit time buffers, with the simultaneous maximisation of new metrics of arrangement robustness. The presented results of experimental research speak for usability of the solutions proposed. The effectiveness is studied with use of test tasks(2) included in the Project Scheduling Problem Library (PSPLIB) with additionally specified project milestones.
Źródło:
Decision Making in Manufacturing and Services; 2009, 3, 1-2; 49-72
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sequential simulated annealing for the vehicle routing problem with time windows
Autorzy:
Woch, M.
Łebkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/375944.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
simulated annealing
vehicle routing problem with time windows
bi-criterion optimization
Opis:
This article presents a new simulated annealing algorithm that provides very high quality solutions to the vehicle routing problem. The aim of described algorithm is to solve the vehicle routing problem with time windows. The tests were carried out with use of some well known instances of the problem defined by M. Solomon. The empirical evidence indicates that simulated annealing can be successfully applied to bi-criterion optimization problems.
Źródło:
Decision Making in Manufacturing and Services; 2009, 3, 1-2; 87-100
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Two-Phase Algorithm for a Resource Constrained Project Scheduling Problem with Discounted Cash Flows
Autorzy:
Klimek, M.
Łebkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/375952.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
resource-constrained project scheduling
discounted cash flows
milestones
heuristics
Opis:
This paper presents a Resource-Constrained Project Scheduling Problem (RCPSP) settled by contractual milestones. The criterion analysed here is the maximisation of aggregate discounted cash flows from the contractor´s perspective, known as an RCPSP problem with Discounted Cash Flows (RCPSPDCF). The cash flows analysed here cover the contractor´s cash outflows (negative cash flows), related to the commencement of individual activities, and cash inflows (positive cash flows) after the fulfilment of individual milestones. The authors propose a two-phase algorithm for solving the problem defined. In the first phase, the simulated annealing metaheuristics is used, designed to identify a forward schedule with as high total DCF as possible. In the second phase, the best first-phase schedule is improved by right shifts of activities. To this end, the procedure which iteratively shifts tasks by one unit is applied, with a view to maximising the objective function. Activity shifts take into consideration precedence and resource constraints, and they are performed for a specified resource allocation to activities. This paper also includes an analysis of the problem for a sample project. The results of computational experiments are then analysed. The experiments were run with the use of standard test problems from the Project Scheduling Problem LIBrary (PSPLIB), with additionally defined cash flows and contractual milestones.
Źródło:
Decision Making in Manufacturing and Services; 2013, 7, 1-2; 51-68
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resource allocation for robust project scheduling
Autorzy:
Klimek, M.
Łebkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/202374.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
resource-constrained project scheduling
robust scheduling
resource allocation
Opis:
The paper presents a formal description of the resource allocation problem for resource-constrained project scheduling. A schedule can be executed by various resource flow networks which may differ in terms of resistance to disruptions occurring during project execution. The authors define such criteria of evaluating a resource flow network which can be more useful than robustness metrics used so far in the research. The authors discuss the importance of robust scheduling for execution projects and propose metrics for resource allocation robustness which take into consideration the stability of the final schedule. Those metrics make it possible to carry out a more precise analysis concerning the properties of the resource flow network in terms of its robustness to disruptions in comparison with a well known flexibility indicator, flex.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 1; 51-55
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robustness of schedules for project scheduling problem with cash flow optimisation
Autorzy:
Klimek, M.
Łebkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/953048.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
resource-constrained project scheduling with cash flow optimisation
proactive scheduling
milestones
Opis:
The paper presents the resource-constrained project scheduling with cash flow optimisation. New project models with bonuspenalty system and payoff in stages have been proposed. For the models presented, the application of proactive scheduling is analysed, as designed to improve project execution under uncertainty. Next, schedule robustness is discussed and measures of robustness are proposed.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 1005-1015
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concept of Industry 4.0-Related Manufacturing Technology Maturity Model (ManuTech Maturity Model – MTMM)
Autorzy:
Gracel, J.
Łebkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/375995.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Industry 4.0
smart factory
manutech maturity model
Opis:
The main objective of this article is to describe Industry 4.0 and the key manufacturing-technology-related technological and business challenges for manufacturing companies. The groups especially interested in the implementation of Industry 4.0 are the operations, technical, and production directors responsible for operational excellence of manufacturing plants, strategic development, and business continuity. Based on the latest Industry 4.0 and manufacturing technology market research, factories located in Poland are less technologically advanced than their counterparts in Western European plants. Accordingly, development of the model for assessing the current level of maturity for manufacturing technology related to the Industry 4.0 initiative becomes a relevant research task. In the article, key Industry 4.0-related technological areas will be described. Based on extensive research into international references and industrial consulting experiences in the industrial business consulting conducted in Polish manufacturing companies, the manufacturing technology ManuTech Maturity Model (MTMM) concept related to Industry 4.0 will be developed and presented. A substantial and innovative part of the article will be devoted to the adjustment of a proposed maturity model to specific features of the Polish industrial and manufacturing sector. This will be relevant due to the noticeable differences in the levels of technological advancement between the Western and Eastern Europe sectors.
Źródło:
Decision Making in Manufacturing and Services; 2018, 12, 1-2; 17-31
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Financial optimisation of the scheduling for the multi-stage project
Autorzy:
Klimek, M.
Łebkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/201022.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
resource - constrained project scheduling problem
discounted cash flows
milestones
backward scheduling
simulated annealing
zdyskontowane przepływy pieniężne
kamienie milowe
symulowane wyżarzanie
Opis:
The paper analyses the problem of discounted cash flow maximising for the resource-constrained project scheduling from the project contractor’s perspective. Financial optimisation for the multi-stage project is considered. Cash outflows are the contactor’s expenses related to activity execution. Cash inflows are the client’s payments for the completed milestones. To solve the problem, the procedure of backward scheduling taking into account contractual milestones is proposed. The effectiveness of this procedure, as used to generate solutions for the simulated annealing algorithm, is verified with use of standard test instances with additionally defined cash flows and contractual milestones.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 6; 899-908
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heuristics for project scheduling with discounted cash flows optimisation
Autorzy:
Klimek, M.
Łebkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/202107.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
resource-constrained project scheduling
discounted cash flows
milestones
ograniczone zasoby planowania projektu
przepływy pieniężne
kamienie milowe
Opis:
The article presents the resource-constrained project scheduling problem with the maximisation of discounted cash flows from the contractor’s perspective: with cash outflows related to starting individual activities and with cash inflows for completing project stages (milestones). The authors propose algorithms for improving a forward active schedule by iterative one-unit right shifts of activities, taking into account different resource flow networks. To illustrate the algorithms and problem, a numerical example is presented. Finally, the algorithms are tested using standard test problems with additionally defined cash flows and contractual milestones.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 3; 613-622
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis of the efficient use of machinery in an aluminum extrusion plant
Autorzy:
Hubicki, R.
Richert, M.
Łebkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/339840.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Zarządzania Produkcją
Tematy:
management
production
efficiency
performance
aluminum alloys
zarządzanie
produkcja
wydajność
osiągi
stopy aluminium
Opis:
This paper discusses the impact of various factors on a company’s manufacturing efficiency of aluminum alloy products. The research was based on SWOT analysis, Gantt chart and the chart-based graphs showing the production capacity distribution on individual production machines.
Źródło:
Zarządzanie Przedsiębiorstwem; 2018, 21, 1; 2-8
1643-4773
Pojawia się w:
Zarządzanie Przedsiębiorstwem
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modele Data Envelopment Analysis (DEA) wykorzystywane do oceny efektywności energochemicznego przetwórstwa węgla
Data Envelopment Analysis (DEA) models used to efficiency evaluation of the energo-chemical coal processing
Autorzy:
Łebkowski, P.
Kwaśniewski, K.
Kopacz, M.
Grzesiak, P.
Kapłan, R.
Powiązania:
https://bibliotekanauki.pl/articles/283530.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
DEA
analiza obwiedni danych
ocena efektywności
czyste technologie węglowe
zgazowanie węgla
data envelopment analysis
efficiency evaluation
clean coal technologies
coal gasification
Opis:
Artykuł skupia się na problematyce związanej z oceną efektywności technologii energetycznych wykorzystujących paliwa kopalne. Zaprezentowano w nim metodę oceny opierającą się na modelach Data Envelopment Analysis, należącą do nieparametrycznych metod oceny efektywności. Modele DEA na przestrzeni ostatnich lat zyskały dużą popularność w szeroko rozumianym przemyśle energetycznym. Wraz ze wzrostem popularności rosną także ich możliwości. W ostatnich latach w literaturze światowej można było zaobserwować liczne artykuły poświęcone nowym modelom DEA opracowanym właśnie na potrzeby przemysłu energetycznego. Najbardziej zaawansowane metody, dedykowane ocenie energochemicznego przetwórstwa węgla, pozwalają kalkulować efektywność z punktu widzenia wielu nakładów energetycznych (węgiel, ropa, gaz itp.) oraz nieenergetycznych (koszty, nakłady, wielkość zatrudnienia itp.), przy jednoczesnym uwzględnieniu zarówno rezultatów pożądanych (moc, zyski itp.), jak i niepożądanych (gazy cieplarniane, ścieki, odpady itp.). Podejście takie pozwala na uzyskanie zunifikowanego współczynnika efektywności oraz wskazanie obiektów efektywnych względem ocenianej grupy. Oprócz wskazania obiektów efektywnych, modele DEA proponują także dla obiektów nieefektywnych technologię wzorcową, która stanowi zbiór najbliższych technologicznie obiektów efektywnych, na których powinna wzorować się dana jednostka. Informacje uzyskane z analizy pozwalają osobom odpowiedzialnym za kreowanie strategii danej jednostki na podjęcie optymalnych decyzji w celu poprawy efektywności. Niniejszy artykuł stanowi przegląd stosowanych modeli.
The article focuses on the issue related to the efficiency assessment of the energy technologies using fossil fuels. It presents the evaluation method which is based on Data Envelopment Analysis models, belonging to non-parametric methods of efficiency evaluation. DEA models, in recent years, gained great popularity in the energy industry. With the increasing popularity, also grow their capabilities. In recent years, in world literature, could be seen a number of articles on the subject of new DEA models developed for the needs of the energy industry. The most advanced methods, dedicated to assessing the energy-chemical coal processing, allow to calculate the efficiency from the point of view of many energy (coal, oil, gas, etc.) and non-energy (costs, expenditures, employment, etc.) inputs, taking into account both the desired (power , profits, etc.) and adverse (greenhouse gases, sludge, waste, etc.) results. This approach allows for obtaining a unified efficiency ratio and an indication of efficient technologies in relation to assessed group. Apart from showing the efficient objects, DEA models also suggest for inefficient objects a reference technology, which is a collection of technologically nearest efficient objects, which should be taken as an exemplary model. Information obtained from the analysis allows responsible for the strategy creation managers for making optimal decisions in order to efficiency improvement. This article provides an overview of the applied models.
Źródło:
Polityka Energetyczna; 2015, 18, 2; 43-59
1429-6675
Pojawia się w:
Polityka Energetyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability evaluation of electrochemical energy storage systems supplying the ships main propulsion system
Autorzy:
Szewczyk, P.
Łebkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/24201455.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
reliability assessment
electric propulsion system
energy storage systems
electric ship
reliability block diagram
probability of failure occurrence
hybrid electric-propulsion system
Opis:
The paper presents the structure of hybrid and electric modern ship propulsion systems. Types and configuration of electrochemical cells for selected electric energy storage facilities on the ship were presented. The method and results of reliability analyses, such as failure mode effect analysis (FMEA), reliability block diagram (RBD) and fault tree analysis (FTA), used to estimate the probability of failure of the energy storage systems supplying the ship's main propulsion, are presented. Methods of evaluation and verification of the proposed reliability model using a laboratory model and available operational and service data are discussed. A proposal for a quantitative risk analysis of potential damage during the operation of the energy storage has been presented.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 1; 87--94
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-12 z 12

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