Two essays on performance evaluation and control of flexible servers
Başlık çevirisi mevcut değil.
- Tez No: 400811
- Danışmanlar: PROF. IZAK DUENYAS
- Tez Türü: Doktora
- Konular: İşletme, Business Administration
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2004
- Dil: İngilizce
- Üniversite: University of Michigan
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 119
Özet
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Özet (Çeviri)
In this dissertation we study production systems with flexible work force. In chapter 2, we consider a production system with multiple machines each serving a different group of products. The machines require setups to switch from one product type to another. Setup operations are performed by a limited number of setup crews who are cross-trained to perform several types of setup operations. We develop a model that take delays caused by setup crew unavailability into account and obtain the average waiting time for each product type. In a numerical study we show that our approximation performs well. We also provide insights into the importance of explicitly modelling the effects of cross- trained setup crews on system performance, and whether and when the level of cross-training the setup crews receive improves system performance. In chapter 3 we consider a production system with two machines and two product types. Machine 1 is a dedicated server and produces product 1 only. Machine 2 is a flexible server which is primarily assigned to product 2 and can also produce product 2 if needed. We characterize the form of the optimal policy in machine 1 and machine 2 in make-to- stock and make-to-order production regimes and show that that the optimal policies are of threshold type. We also show monotonicity of production and idling curves with respect to system parameters. Finally, in a numerical study we provide insights on the benefit of flexibility and when the models considered in chapter 3 outperforms a single flexible machine or a two dedicated machine system.
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