Uncertainty in Supply Chain Management can lead to unsuitable services to customers, but it can be overcome through having an emergency inventory. Due to high costs of inventory, a general inclination exists towards a minimum inventory. So, one of the objectives of Supply Chain Management is to coordinate all activities throughout the chain, so that simultaneously with reducing commodity invent...

Amaç –Bu çalışma kapsamında, Türkiye’nin elektrik piyasasını modellemek için Sistem dinamiği modeli (SDM) Vensim PLE programı ile oluşturulmuştur. modeli, bu tür karmaşıklıkları uygun bir yaklaşımdır. Yöntem –Sistem dinamiği, geri bildirim sistemlerine dayanan metodolojidir. Dinamiği Jay Wright Forrester tarafından geliştirimiştir. Forrester'ın metodolojisi, karmaşık ve dinamik sistemler bilgis...

Though the size of System Dynamics models should be compact focusing on the main feedback loops determining system behavior one kind of model can become quite large: multi-national, multi-sectoral spatially differentiated models. The paper briefly presents such a model called ASTRA (=Assessment of Transport Strategies), which is developed in several versions over the past eight years. The purpo...

This paper describes one of the latest in a series of system dynamics models developed during the FEAST (Feedback, Evolution And Software Technology) investigation into software evolution processes. The intention of early models was to simulate real-world processes in order to increase understanding of such processes. The work resulted in a number of lessons learnt, in particular, with regard t...

This paper deals with the theory of codimension one bifurcations applied to a dynamical system derivedfrom applying Pontryagin 's maximum principIe to an optimal control problem for economic fisheries management. Changes in the number and/or the stability of stationary states as well as the appearance of closed orbits, are analyzed. Some necessCl.'Y and/or sufficient conditions are established ...

Reform of drug procurement is being extensively implemented and expanded in China, especially in today's big data environment. However, the pattern of supply mode innovation lags behind procurement improvement. Problems in financial strain and supply break frequently occur, which affect the stability of drug supply. Drug Pooling System is proposed and applied in a few pilot cities to resolve th...

System dynamics models provide a detailed mathematical description of the complex interactions between numerous variables. Software packages, such as iThink and Vensim, allow policy makers to easily adapt, implement and explore these models. By testing various scenarios through an analysis of the model with different parameter values it is possible to investigate and visualise the long-term eff...