Artículo de publicación ISIIn this article, a hybrid predictive control (HPC) strategy is formulated for the real-time optimisation of a public transport system operation run using buses. For this problem, the hybrid predictive controller corresponds to the bus dispatcher, who dynamically provides the optimal control actions to the bus system to minimise users' total travel time (on-vehicle ride time plus waiting time at stops). The HPC framework includes a dynamic objective function and a predictive model of the bus system, written in discrete time, where events are triggered when a bus arrives at a bus stop. Upon these events, the HPC controller makes decisions based on two well-known real-time transit control actions, holding and expressing. Additionally, the uncertain passenger demand is included in the model as a disturbance and then predicted based on both offline and online information of passenger behaviour. The resulting optimisation problem of the HPC strategy at every event is Np-hard and needs an efficient algorithm to solve it in terms of computation time and accuracy. We chose an ad hoc implementation of a Genetic Algorithm that permits the proper management of the trade-off between these two aspects. For real-time implementation, the design of this HPC strategy considers newly available transport technology such as the availability of automatic passenger counters (APCs) and automatic vehicle location (AVL) devices. Illustrative simulations at 2, 5 and 10 steps ahead are conducted, and promising results showing the advantages of the real-time control schemes are reported and discussed.ACT-32 Project 'Real-Time Intelligent Control for Integrated Transit Systems'
ACT-32 Project
Fondecyt Chile
1061261
Millennium Institute
ICM: P-05-004-F
CONICYT: FBO1
This paper aims to describe the response capacity of primary care to meet the needs that patients with somatoform disorders. Knowing the type of care delivered and the perception that these patients have about the care provided. The sample consists of 25 patients from three primary care centers in the commune of Chillán. Patients perceive that their health claims are resolved only sometimes in the primary care center, despite considerable human resource costs, and drug tests. The results are discussed in relation to the limitations presented and projections.
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