臺灣博碩士論文加值系統

在本篇論文中，我們研究穩態狀況下，含有R個不可靠的卸貨站(unloader)及N部完全相同且獨立的拖車( trailer )之排隊系統。
首先，我們推導系統的穩態分析解。然後，再建立成本函數，
在不同的卸貨站排隊系統下，求得卸貨站個數與 值的最佳解，
以達到最低成本。在最佳的營運條件下，針對不相同的系統參數值，
我們提供系統效應( system performance )之數值結果。
最後，敏感度分析也列入研究當中。

In this thesis, we study R-unreliable-unloader queueing system in which N identical and independent trailers are unloaded by R unloaders. We first develop the steady-state analytic solutions of the system. Next, the expected cost function is developed in order to determine the optimal values of the number of unloaders R and extra finishing rate so as to minimize the expected cost function. Under the optimal operating conditions, numerical results are provided in which several system performance measures are evaluated for several cases. Finally, sensitivity analysis is also investigated.

1. INTRODUCTION 1
1.1 Problem Statement 2
1.2 Literature Review 3
1.3 Scope of the Study 4
2. ONE-UNLOADER QUEUEING SYSTEM WITH AN
UN-RELIABLE UNLOADER 5
2.1 Assumptions of the model 6
2.2 Steady-State results 7
2.3 System Performance Measures 12
2.4 Economic Analysis 14
3 R-UNLOADER QUEUEING SYSTEM WITH R
UN-RELIABLE UNLOADERS 20
3.1 Assumptions of the model 21
3.2 Steady-State results 22
3.3 System Performance Measures 26
3.4 Economic Analysis 28
4 CONCLUSIONS AND FUTURE RESEARCH 33
4.1 Conclusions 33
4.2 Future Research 33
REFERENCES 34

[1] K. Chelst, A. Z. Tilles and J. S. Pipis (1981). A coal unloader : a finite queueing system with breakdowns. Interfaces Vol. 11, 12-24.
[2] H. C. Tijms (1986). Stochastic Modelling and Analysis : A Computational Approach. John Wiley & Sons, New York.
[3] K.-H. Wang, C.-H. Wang and S.X. Bi (1997). "Cost Analysis of the R-unloader Queueing System," Journal of the Operational Research Society, Vol. 48, 810-817.
[4] K.-H. Wang, Y.-C. Chiang and J.-C. Ke (2003). "Cost Analysis of the Unloader Queueing System with a Single Unloader Subject to Breakdowns. " Journal of the Operational Research Society, Vol. 54, 515-520.