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Wyświetlanie 1-3 z 3
Tytuł:
Impact of baseline terms on the course of critical paths and time buffers in the modified Goldratt’s method
Autorzy:
Połoński, M.
Pruszyński, K.
Powiązania:
https://bibliotekanauki.pl/articles/231208.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bufor projektu
termin bazowy
ścieżka krytyczna
metoda Goldratta
project buffer
baseline term
critical path
Goldratt’s method
Opis:
The introduction of a baseline term to the dependency network most often results in a change, break and/or generation of a new sequence of critical path, depending on the type of such a baseline term and the exact date selected. Each of those situations has an impact on the location or need to include new time buffers in the modified Goldratt’s method. The purpose of this article was to identify possible effects brought by declaration of each type of baseline term and to point out actions to be taken in each case. It must be noted that guidelines provided should in each individual case be adapted to the specific character of schedule changes caused by implementation of the relevant baseline term. The example presented herein exemplifi es one of such solutions to be implemented as a result of break of the critical path and need to introduce new time buffers.
Źródło:
Archives of Civil Engineering; 2013, 59, 3; 313-320
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the work breakdown structure in determining cost buffers in construction schedules
Autorzy:
Połoński, M.
Powiązania:
https://bibliotekanauki.pl/articles/231132.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
szacowanie kosztów
niepewność
koszt nieprzewidziany
bufor kosztu
struktura podziału pracy
projekt budowlany
cost estimating
uncertainty
contingent cost
cost buffer
work breakdown structure
construction project
Opis:
The paper presents methods of determining the location of cost buffers and corresponding contingency costs in the CPM schedule based on its work breakdown structure. Application of correctly located cost buffers with appropriately established reserve costs is justified by the common overrunning of scheduled costs in construction projects. Interpolated cost buffers (CB) as separate tasks have been combined with relevant summary tasks by the starttostart (SS) relationship, whereas the time of their execution has been dynamically connected with the time of accomplishment of particular summary tasks using the “paste connection” option. Besides cost buffers linked with the group of tasks assigned to summary tasks, a definition of the cost buffer for the entire project (PCB) has been proposed, i.e. as one initial task of the entire project. Contingency costs corresponding to these buffers, depending on the data that the planner has at his disposal, can be determined using different methods, but always depend on the costs of all tasks protected by each buffer. The paper presents an exemplary schedule for a facility and the method of determining locations and cost for buffers CB and PCB, as well as their influence on the course of the curve illustrating the budgeted cost of work scheduled (BCWS). The proposed solution has been adjusted and presented with consideration of the possibilities created by the scheduling software MS Project, though its general assumptions may be implemented with application of other similar specialist tools.
Źródło:
Archives of Civil Engineering; 2015, 61, 1; 147-161
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single–server queueing system with limited queue, random volume customers and unlimited sectorized memory buffer
Autorzy:
Ziółkowski, Marcin
Tikhonenko, Oleg
Powiązania:
https://bibliotekanauki.pl/articles/2173725.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
single-server queueing system
queueing systems with random volume customers
sectorized memory buffer
total volume vector
Laplace-Stieltjes transform
system kolejkowy z jednym serwerem
system kolejkowy z losowymi klientami
bufor pamięci sektorowany
wektor objętości całkowity
transformata Laplace'a-Stieltjesa
Opis:
In the present paper, we analyze the model of a single–server queueing system with limited number of waiting positions, random volume customers and unlimited sectorized memory buffer. In such a system, the arriving customer is additionally characterized by a non– negative random volume vector whose indications usually represent the portions of unchanged information of a different type that are located in sectors of unlimited memory space dedicated for them during customer presence in the system. When the server ends the service of a customer, information immediately leaves the buffer, releasing resources of the proper sectors. We assume that in the investigated model, the service time of a customer is dependent on his volume vector characteristics. For such defined model, we obtain a general formula for steady–state joint distribution function of the total volume vector in terms of Laplace-Stieltjes transforms. We also present practical results for some special cases of the model together with formulae for steady–state initial moments of the analyzed random vector, in cases where the memory buffer is composed of at most two sectors. Some numerical computations illustrating obtained theoretical results are attached as well.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 6; art. no. e143647
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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