scholarly journals A Stochastic Simulation Model for the Optimization of the Taxi Management System

2019 ◽  
Vol 11 (14) ◽  
pp. 3838
Author(s):  
Aleksander Król ◽  
Małgorzata Król
Keyword(s):  
Simulation Model ◽  
Real Number ◽  
Service Level ◽  
Critical Number ◽  
System Behavior ◽  
Taxi Drivers ◽  
The Real ◽  
Incomplete Knowledge ◽  
Stochastic Simulation Model ◽  
Queue Theory

The paper presents a simplified simulation model of the operation of a taxi system. The model retains the main features of a real taxi transportation system and despite its simplicity examines the system behavior in different conditions. It was shown that for every request generation rate a critical number of taxis in disposal could be determined. If the real number of taxis is lower than the critical number, the queue of pending requests grows in an unlimited way. On the other hand, if the real number of taxis is significantly higher, the service level is clearly not better and leads to the waste of taxi drivers’ time and fuel. The presented model can be regarded as a queue system; therefore, the well-known queue theory is used to describe its nature. However, this approach has some practical limitations coming from incomplete knowledge on real transportation demands, which additionally undergo significant fluctuations. A method, which optimizes the assignment of vacant taxis to the pending requests was also introduced. It was proven that this method mitigated the influence of the above-mentioned limitations.

Stochastic simulation for determining the design flood of cascade reservoir systems

2012 ◽  
Vol 43 (1-2) ◽  
pp. 54-63 ◽  
Author(s):  
Baohong Lu ◽  
Huanghe Gu ◽  
Ziyin Xie ◽  
Jiufu Liu ◽  
Lejun Ma ◽  
...  
Keyword(s):  
Simulation Model ◽  
Stochastic Simulation ◽  
Southern China ◽  
Flow Simulation ◽  
Simulation Method ◽  
Simulation Approach ◽  
Design Flood ◽  
Design Values ◽  
Stochastic Simulation Model ◽  
The Impact

Stochastic simulation is widely applied for estimating the design flood of various hydrosystems. The design flood at a reservoir site should consider the impact of upstream reservoirs, along with any development of hydropower. This paper investigates and applies a stochastic simulation approach for determining the design flood of a complex cascade of reservoirs in the Longtan watershed, southern China. The magnitude of the design flood when the impact of the upstream reservoirs is considered is less than that without considering them. In particular, the stochastic simulation model takes into account both systematic and historical flood records. As the reliability of the frequency analysis increases with more representative samples, it is desirable to incorporate historical flood records, if available, into the stochastic simulation model. This study shows that the design values from the stochastic simulation method with historical flood records are higher than those without historical flood records. The paper demonstrates the advantages of adopting a stochastic flow simulation approach to address design-flood-related issues for a complex cascade reservoir system.

scholarly journals Estimating the economic impact of subclinical ketosis in dairy cattle using a dynamic stochastic simulation model

animal ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 145-154 ◽  
Author(s):  
P.F. Mostert ◽  
E.A.M. Bokkers ◽  
C.E. van Middelaar ◽  
H. Hogeveen ◽  
I.J.M. de Boer
Keyword(s):  
Dairy Cattle ◽  
Simulation Model ◽  
Economic Impact ◽  
Stochastic Simulation ◽  
Subclinical Ketosis ◽  
Dynamic Stochastic ◽  
Stochastic Simulation Model

scholarly journals An algebraic proof of the real number PCP theorem

2017 ◽  
Vol 40 ◽  
pp. 34-77 ◽  
Author(s):  
Martijn Baartse ◽  
Klaus Meer
Keyword(s):  
Real Number ◽  
Algebraic Proof ◽  
The Real ◽  
Pcp Theorem

scholarly journals II. On the Number of the Lost Books of Tacitus. By the Lord Mahon

Archaeologia ◽  
1838 ◽  
Vol 27 ◽  
pp. 15-17
Author(s):  
Mahon
Keyword(s):  
Real Number ◽  
The Real

The historical works of Tacitus which remain to us are, as is well known, besides the Life of Agricola, the four first books of the Annals, part of the fifth, the sixth, the eleventh, twelfth, thirteenth, fourteenth, fifteenth, and part of the sixteenth, the four first books of the History, and part of the fifth. It is asserted by Brotier, in his excellent edition, that the total number of books must have been sixteen of Annals and fourteen of History, and this assertion has never yet, so far as I know, been doubted or called in question. I think, however, that there are strong grounds for presuming that the real number of books was eighteen of Annals and twelve of History; and, though the point be of small importance, it may perhaps not be without some interest to the admirers of the greatest of Historians.

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