Eleventh International Conference on Road Transport Information and Control, 2002. (Conf. Publ. No. 486)
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Analysis of peak torque of line-operated synchronous machines subjected to symmetrical voltage sags
Eleventh International Conference on Road Transport Information and Control, 2002. (Conf. Publ. No. 486) - - Trang 480-485 - 2002
Voltage sags and voltage interruptions are serious power quality problems for
many industries. Apart from eventual tripping, voltage sags cause high torque
peaks, which may cause damage to the shaft or equipment connected to the shaft.
This paper shows how the torque depends on both the duration and the magnitude
of voltage sags. First a simple theory is presented, and then to verify the
theory, s...
Neural Based Tabu Search method for solving unit commitment problem
Eleventh International Conference on Road Transport Information and Control, 2002. (Conf. Publ. No. 486) - - Trang 180-185 - 2002
This paper presents a new approach to solve short-term unit commitment problem
(UCP) using neural based tabu search (NBTS). The solution of the unit commitment
problem is a complex optimization problem. The exact solution of the UCP can be
obtained by a complete enumeration of all feasible combinations of generating
units, which could be very huge number. The unit commitment has commonly been
form...
Effects of external vehicle speed limiting and headway advice on motorway traffic
Eleventh International Conference on Road Transport Information and Control, 2002. (Conf. Publ. No. 486) - - Trang 146-150 - 2002
The Traffic Responsive Intelligent Speed and Headway Adaptation (TRISHA) project
investigated the effects of the external application of limits to the
performance of individual vehicles from the roadside. The limits considered were
maximum speed and minimum headway based on real-time traffic flow information.
The objective of such limits would be to promote smoother traffic flow and
better control...
Journey time estimation using MIDAS loop data
Eleventh International Conference on Road Transport Information and Control, 2002. (Conf. Publ. No. 486) - - Trang 177-181 - 2002
MIDAS (Motorway Incident Detection and Automatic Signalling system) has been
operational on a number of motorways as part of the Highways Agency's traffic
management system. To verify the accuracy of the existing algorithm for
calculating journey times on the M25, video footage and ANPR data, taken from
two gantries between Junctions 15 and 16, have been recorded as part of the
monitoring of the C...
Comparison of charging methods in 3G mobile networks (consumer behaviour versus tariff models)
Eleventh International Conference on Road Transport Information and Control, 2002. (Conf. Publ. No. 486) - - Trang 382-387 - 2002
The paper describes an approach to analyse various charging mechanisms according
to consumer behaviour, service types and tariff models in third generation (3G)
mobile networks. In the area of charging for mobile networks, much work has been
done to create proprietary billing solutions to address the problems of optimal
allocation of network resources and bandwidth control. However, the
sophistica...
Estimation of salt contamination level on the high voltage insulators surfaces during rainy season using artificial neural network
Eleventh International Conference on Road Transport Information and Control, 2002. (Conf. Publ. No. 486) - - Trang 303-308 - 2002
Power system reliability depends mainly on the environmental and weather
conditions which cause flashover on polluted insulators. Such flashover leads to
system outages. Near the coastal areas the salt contamination can be rapidly
built on the surface of the insulators and form a conducting layer by absorbing
wet from the mist. This layer in some cases leads to flashover. Study of
contamination of...
Predictive power control for S-UMTS based on least-mean-square algorithm
Eleventh International Conference on Road Transport Information and Control, 2002. (Conf. Publ. No. 486) - - Trang 128-132 - 2002
In order to exploit the presence of non-zero autocorrelation between consecutive
samples of channel variations, predictive schemes based on a recursive least
squares (RLS) adaptive algorithm have been proposed. The main motivation for
using RLS is its fast convergence property. The RLS algorithm places enormous
computational burden on the transmit power control system. In slow power
control, howev...
Finite element modelling of nonlinear stress grading materials for machine end windings
Eleventh International Conference on Road Transport Information and Control, 2002. (Conf. Publ. No. 486) - - Trang 265-268 - 2002
As machine end windings leave the stator core their surface can be subject to
high voltage gradients. The high electric stresses arising here can lead to
sparking and erosion. To alleviate the stresses special stress grading materials
are applied whose resistivity varies with the applied stress. Since the tape is
very thin in comparison with other dimensions a surface representation has been
imple...
Hierarchical management of CDMA network resources
Eleventh International Conference on Road Transport Information and Control, 2002. (Conf. Publ. No. 486) - - Trang 216-220 - 2002
The paper describes the use of a layer-based approach to managing CDMA uplink
network resources. The aim of the proposed method is to specify an integrated
call allocation and admission control algorithm for a CDMA network with the
ability to tailor-make solutions based on network load and topology. The paper
includes investigations on the use of an auction-based method for the allocation
and admi...
Performance analysis of smart antenna systems for indoor wireless LANs
Eleventh International Conference on Road Transport Information and Control, 2002. (Conf. Publ. No. 486) - - Trang 418-422 - 2002
Given the potential market for wireless LAN (WLAN) technology, capacity within
the available 2 and 5GHz frequency bands is likely to fall short of market
demands. Multiple-sector antenna arrays are known to be able to provide capacity
enhancement by means of interference reduction through spatial filtering. In
this paper, the performance of an eight-element circular array acting as an
access point...
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