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Bullwhip effect problem in supply chains
Borut Buchmeister, Jože Pavlinjek, Iztok Palčič, Andrej Polajnar, 2008, original scientific article

Abstract: In Supply Chain Management, a phenomenon called the "Bullwhip Effect" has attracted considerable attention. Overall supply chain evaluation needs to include the Bullwhip Effect. The Bullwhip Effect shows how small changes at the demand end of a supply chain are progressively amplified for operations further back in the chain. It is understood that demand forecast variance contributes to that effect in the chain. With this understanding, the authorsexperimented with two cases: stable demand with a single 5 % change in demand, and changing demand in periodic 10 % increases and later in the same decreases. Two stock keeping policies for all stages in the chain have been studied: to keep in stock i) one, and ü) two periods' demand. Results are shown in tables and charts. Increasing variability of production orders and stocks up the supply chain is evident. The effect indicates a lack of synchronization among supply chain members because of corrupt key information about actual demand. When we understand the nature of supply chain dynamics, there are several actions concerned with coordinating the activities of the operations in the chain, which is discussed in the last part of the paper.
Keywords: supply chain, demand fluctuation, bullwhip effect, production rate variability, stock level variability
Published: 01.06.2012; Views: 1104; Downloads: 16
URL Link to full text

3.
Uporaba vrednostno-časovnega profila pri optimizaciji stroškov investicijskega projekta
Jože Pavlinjek, 2016, master's thesis

Abstract: Ideje vitke proizvodnje so prisotne tudi na področju projektnega menedžmenta. Problem vrednostno-časovne optimizacije je eden od ključnih vidikov načrtovanja investicijskih projektov. Investitorji in načrtovalci projektov morajo izbrati ustrezne vire, vključno z izvajalci, opremo, postopki in tehnologijo, da bi zagotovili učinkovito izvedbo investicijskega projekta. Pri tem se vedno soočajo z iskanjem kompromisa med stroški in časom zaključka potrebnih aktivnosti; cenejši so viri, dlje vse skupaj traja ali pa se pojavijo problemi s kakovostjo. Na izhodiščih oz. na osnovi načel vitke proizvodnje, metode kritične poti, analize toka vrednosti, obračuna stroškov po toku vrednosti in vrednostno-časovnega profila je v magistrskem delu analiziran celotni proces izgradnje 50 kW mikro soproizvodnje toplotne in električne energije, s poudarkom na razmerju med stroški in časom; zasnovani so različni ukrepi vrednostno-časovne optimizacije projekta izgradnje in ovrednoteni njihovi rezultati (stroški projekta, trajanje, vrednostno-časovni vložek) in posledice v okviru pogojev obravnavane investicije. Ugotovitve kažejo, da prinašajo pomembne prednosti hitreje izpeljani projekti. Naloga podaja znanstveno osnovo in podporo za sprejemanje projektnih odločitev.
Keywords: vitka proizvodnja, analiza toka vrednosti, investicijski projekt, stroški, vrednostno-časovni profil, vrednostno-časovni vložek, optimizacija
Published: 09.08.2016; Views: 485; Downloads: 78
.pdf Full text (4,02 MB)

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