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- Csikos, A, et al.
(författare)
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Network traffic flow optimization under performance constraints
- 2017
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Ingår i: Transportation Research, Part C: Emerging Technologies. - : Elsevier BV. - 0968-090X. ; 83, s. 120-133
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, a model-based perimeter control policy for large-scale urban vehicular networks is proposed. Assuming a homogeneously loaded vehicle network and the existence of a well-posed Network Fundamental Diagram (NFD), we describe a protected network throughout its aggregated dynamics including nonlinear exit flow characteristics. Within this framework of constrained optimal boundary flow gating, two main performance metrics are considered: (a) first, connected to the NFD, the concept of average network travel time and delay as a performance metric is defined; (b) second, at boundaries, we take into account additional external network queue dynamics governed by uncontrolled inflow demands. External queue capacities in terms of finite-link lengths are used as the second performance metric. Hence, the corresponding performance requirement is an upper bound of external queues. While external queues represent vehicles waiting to enter the protected network, internal queue describes the protected network’s aggregated behavior.By controlling the number of vehicles joining the internal queue from the external ones, herewith a network traffic flow maximization solution subject to the internal and external dynamics and their performance constraints is developed. The originally non-convex optimization problem is transformed to a numerically efficiently convex one by relaxing the performance constraints into time-dependent state boundaries. The control solution can be interpreted as a mechanism which transforms the unknown arrival process governing the number of vehicles entering the network to a regulated process, such that prescribed performance requirements on travel time in the network and upper bound on the external queue are satisfied. Comparative numerical simulation studies on a microscopic traffic simulator are carried out to show the benefits of the proposed method.
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| 3. |
- Csikos, A, et al.
(författare)
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Traffic flow optimization with QoS constrained network admission control
- 2017
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Ingår i: IFAC-PapersOnLine. - : Elsevier BV. - 2405-8963. ; 50:1, s. 5275-5280
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Konferensbidrag (refereegranskat)abstract
- The paper proposes a control design method in order to gate input flow to a protected urban vehicular network such that travel time Quality of Service (QoS) constraints are preserved within the network. In view of the network to be protected (also called the region), two types of queues are distinguished: external and internal. While external queues represent vehicles waiting to enter the protected network, an internal queue can be used to describe the network's aggregated behaviour. By controlling the number of vehicles entering the internal queue, the travel time within the network subject to the vehicular conservation law and the Network Fundamental Diagram (NFD) can be subsequently controlled. The admission controller can thus be interpreted as a mechanism which transforms the unknown arrival process governing the number of vehicles entering the network to a regulated process, such that prescribed QoS requirements on travel time in the network and upper bound on the external queue are satisfied. The admission control problem is formulated as a constrained convex optimization problem and a Model Predictive Control (MPC) problem. A case study demonstrates the benefits of the admission control mechanisms proposed.
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| 4. |
- Kekecs, Zoltan, et al.
(författare)
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Test-Retest Reliability of the Stanford Hypnotic Susceptibility Scale, Form C and the Elkins Hypnotizability Scale
- 2021
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Ingår i: International Journal of Clinical and Experimental Hypnosis. - : Informa UK Limited. - 1744-5183 .- 0020-7144. ; 69:1, s. 142-161
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Tidskriftsartikel (refereegranskat)abstract
- This project aimed to assess the consistency of hypnotizability over repeated assessments when measured by the Stanford Hypnotic Susceptibility Scale: Form C (SHSS:C), and the Elkins Hypnotizability Scale (EHS) and to contrast score distribution and pleasantness of these scales. University students were administered either the SHSS:C or the EHS twice with a one-week delay by separate experimenters. Test-retest reliability of the EHS and the SHSS:C was rs =.82 (.71-.92) and rs =.66, 95% (.47-.86), respectively (Spearman's correlation). Hypnotizability was comparable at test and retest in the EHS group, SHSS:C scores decreased by the retest. We found that the SHSS:C produced higher scores than the EHS, and the pleasantness of the 2 scales was comparable. Overall, our results supported the reliability of the EHS, while SHSS:C scores were more inconsistent between the 2 assessments. More research is warranted.
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| 5. |
- Luspay, T., et al.
(författare)
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Ramp metering for flow maximisation and emission reduction – a set-based multi-objective design approach
- 2017
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Ingår i: Transportation Research Procedia. - : Elsevier BV. - 2352-1465 .- 2352-1457. ; 27, s. 937-944
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Konferensbidrag (refereegranskat)abstract
- A set-theoretical approach is presented for a multi-objective control design of the local ramp metering problem. Two control objectives are specified: first, the optimization of traffic performance, by the minimization of total time spent.Second, the emission factor of CO2 is minimized. The optimal state for traffic emission however lies in the unstable domain of the system. To resolve this inconsistency, the control problem is formalized in a set-theoretical context. For this purpose, the nonlinear METANET model is rewritten in a shifted coordinate frame in a parameter-varying, polytopic representation. Bounds on state-, input- and disturbance variables are expressed by convex polytopes. These sets are then used for the design of an interpolated H∞ controller that is capable of improving traffic conditions according to the prescribed multi-objective criteria.
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| 6. |
- Luspay, T., et al.
(författare)
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Set-based multi-objective control of metered ramps at ring road junctions
- 2020
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Ingår i: Transportmetrica A: Transport Science. - : Informa UK Limited. - 2324-9943 .- 2324-9935. ; 16:2, s. 337-357
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Tidskriftsartikel (refereegranskat)abstract
- A set-theoretical approach is presented for a multi-objective control design of the local ramp metering problem. Two control objectives are specified: first, the optimization of traffic performance, by the minimization of total time spent. Second, the emission factor of CO2 needs to be minimized. The optimal state for traffic emission however lies in the unstable domain of the dynamic system. To dissolve this inconsistency, the control problem is formalized for the multi-objective optimization problem by using set-theoretical methods. For this purpose, the non-linear model METANET is rewritten in a shifted coordinate frame with a parameter-varying, polytopic representation. Bounds on state-, input- and disturbance variables are expressed by convex polytopes. These sets are then used for the design of an interpolated Hinf controller that is capable of improving traffic conditions according to the prescribed multi-objective criteria
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