a new method is developed for a fast identification of the stability situation of industrial processes. the proposed method includes two factor ratios of the control constants for the upper and lower control limits to process these constants. an indication ratio is then defined as the ratio of the maximum data range value to the difference between the maximum and average values for individual d...

process capability indices (pcis) can be used as an effective tool for measuring product quality and process performance. in classic quality control there are some limitations which prevent a deep and flexible analysis because of the crisp definition of pca‟s parameters. fuzzy set theory can be used to add more flexibility to process capability analyses. in this study, the fuzzy x ba and mrx ba...

İşletmelerin küresel ekonomik rekabet ortamında faaliyetlerini gerçekleştirmesi, işletmelerin bilgi teknolojilerine dayalı mal ve hizmet üretim süreçleri oluşturmalarını zorunlu hale getirmektedir. Artan teknoloji kullanımı karşısında gerçekleştirilen faaliyetlere ait alt işlem süreçlerinin kontrol altına alınması yönetilmesi iç sistemlerine kritik bir rol yüklemektedir. Daha fazla sürecin veri...

Quantitative methods seek to explore how a system evolves in the dimensions of space and time. The usual notion of space is a discrete one such as the reachable states of a high-level model, but others are possible, such as fluid models. The usual notion of time is a continuous one such as the average duration of activities, as used in stochastic processes governed by the exponential distributi...

This paper provides a contribution to qualitative reasoning for continuous process supervision. Tools for formalizing empirical knowledge of continuous processes and a naive reasoning nat­ urally integrating perception are proposed. A new paradigm emerges : maintenance of a single instantaneous and possibly partial understanding of a physical system during its evolution. This understanding in c...

In this study, a mathematical model is introduced to simulate the coupled heat transfer equation and Stefan condition occurring in moving boundary problems such as the solidification process in the continuous casting machines. In the continuous casting process, there exists a two-phase Stefan problem with moving boundary. The control-volume finite difference approach together with the boundary ...

heat transfer mechanisms and the solidification process are simulated for a continuous casting machine and the geometric shape of the liquid pool is predicted considering different conditions. a heat transfer and solidification model is described for the continuous casting of steel slabs. the model has been established on the basis of the technical conditions of the slab caster in the continuou...