Information Technology Reference
In-Depth Information
2.10 Hub Location Problem
Hub location problems are likely to occur in any kind of logistic system. A hub
is a special type of facility, which collects the flow from a set of other facilities,
transfers it to other hub facilities and distributes it to its final destination.
A hub location problem consists of a location part, in which the locations of
the hub nodes are selected, and an allocation part, in which every non-hub node
is assigned to one ore more hub nodes [38, 49].
The hub center problem is to locate appropriate numbers of hubs and to allo-
cate nonhub nodes to hub nodes so that the maximum travel time (or distance)
between any origin-destination pair is minimized.
2.11 Automatic Train Control
State-of-the-art information and communication technologies allow for an au-
tomated driverless operation of insular mass transit systems. In the long term
such options exist for railway operation in general. Energy eciency effects can
be achieved through general optimisation of driving style and trac flows.
Finding the optimum energy-saving train run-curve is one of the issues. The
optimisation is made by changing the speed-position profile with keeping the
same running time. Analysis of the optimum 'energy-saving' train run-curve is
one of the dicult research topics of train operation.
2.12 Train Dispatch
The Train Dispatch System handles the scheduling of train trac. This in-
cludes the arrival and departure of trains from stations and may also include
information on which lines to use when traveling between stations. We refer
to [30, 71, 87, 115] for more details on distributed train dispatching system and
its complexity issues.
2.13 Shunting and Marshalling
Given description of the status (whereabouts, availability, etc.) of rolling stock,
including train bodies waiting to be decomposed, and given description of train
bodies to be composed, shunting and marshalling implies both the planning for,
and the execution of, plans of shunting and marshalling.
Shunting and marshalling involves route planning and signalling: i.e. the set-
ting of unit states. Shunting and marshalling also involves determination of train
body, car and wagon positions.
More information about this topic can be found in [21, 50, 87].
2.14 Passenger and Freighter Information
The main subject of railway information systems is a real-time dissemination of
the time and other status of all incoming, arrived or departed trains, whether
passenger or freight trains, and if the latter, what freight has been received or
passed on, and then to where.
Passenger & freighter information systems are not the subject of the Thesis,
instead we refer to [52, 77].
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