Incident management in intelligent transportation systems

Intelligent Transportation Systems, 1998

Investigating the use of kalman filtering approaches for dynamic origin-destination trip table estimation,"

Networks and Spatial Economics, 2005

A new method for performing Dynamic Traffic Assignment @TA) is presented which is applicable in real time, since the solution is based on feedback control. This method employs the design of nonlinear H , feedback control systems which is robust to certain class of uncertainties in the system. The solution aims at achieving user equilibrium on alternate routes in a network setting.

2006 IEEE Intelligent Transportation Systems Conference, 2006

This paper presents design of nonlinear feedback controllers for two different models representing evacuation dynamics in one dimension. The models presented here are based on the laws of conservation of mass and momentum. The first model is the classical one equation model for a traffic flow based on conservation of mass with a prescribed relationship between density and velocity. The other model is a two equation model in which the velocity is independent of the density. This model is based on conservation of mass and momentum. The equations of motion in both cases are described by nonlinear partial differential equations. We address the feedback control problem for both models. The objective is to synthesize a nonlinear distributed feedback controller that guarantees stability of a closed loop system. The problem of control and stability is formulated directly in the framework of partial differential equations. Sufficient conditions for Lyapunov stability for distributed control are derived.

1995 IEEE International Conference on Systems, Man and Cybernetics. Intelligent Systems for the 21st Century, 1995

For the development of the field of fuzzy control systems, techniques for modeling fuzzy systems need to be developed, which makes analysis of the system and the design of control laws systematic. In this paper, a new model of fuzzy systems is proposed which is a variation of "Tagaki and Sugeno's fuzzy model". Analysis of this model in terms of stability, controllability, observability etc. is much simpler. It also makes model-based control design easier, while retaining the derivations of connections of fuzzy blocks for piecewise continuous polynomial membership functions. Although the model is easier to analyze, it can represent highly nonlinear dynamics.

1992 American Control Conference, 1992

Sliding mode control is a standard approach to tackde the parametric and modeling uncertainities of a non-lnar system. However, the robust control obtained by using sliding mode has a price, which is the high frequency chattering enoountered during the digital implementation of the control. The idea of introducing a boundary layer around the switching surface and approximating a corninuous control inside it has been extended for different kinds of systems. The systems should be analyzed to ascertain which continuous law is appropriate within the boundary layer. In this paper the effect of various continuous control approximations within the boundary layer to chattering and error convergence in diferent systems is studied.

Proceedings of Conference on Intelligent Transportation Systems, 2000

The merging process in an Automated Highway System (AHS) is divided into a speed adjustment stage and a lane merging stage. Three important parameters, namely, acceptability, availability and pursuability, are analyzed to characterize the AHS lane gap features for the ideal, smooth and safe merging of the ramp vehicles. Three control guidance laws, namely, linear, optimal and parabolic speed profiles, are developed to describe the desired behaviors of the merging vehicle based on the merging quality and safety. The desired states of the merging vehicle are generated through the outer loop by specified control guidance law. The tracking errors compared with desired states are eliminated by the proper design of controllers in the inner loop. Both longitudinal and lateral controllers are designed using sliding mode control theory that can handle the nonlinear and model uncertainties of the vehicle dynamics. The simulation results show encouraging results. Acceped gap P'"t 0 Ending "El E

Proceedings of Conference on Intelligent Transportation Systems, 1997

This paper presents a solution to the user equilibrium Dynamic Traffic Routing (DTR) problem for a point diversion case using feedback control methodology.

IEEE Transactions on Systems, Man, and Cybernetics - Part A: Systems and Humans, 1999

Ünsal, Cem; Kachroo, P.; and Bay, J. S., "Multiple stochastic learning automata for vehicle path control in an automated highway system" (1999). Faculty Publications (ECE). Paper 46.

International Conference on Intelligent Transportation, 2001

This paper presents the estimation of travel time on highways based on macroscopic modelling. The focus is on real-time values as compared to average or static values. The macroscopic models are used for distributed and time/space lumped settings and corresponding travel time estimation functions and algorithms are developed. The implications of these algorithms for the implementation of various incident management

Resumen La capacidad de la angustia de desvelar lo oculto está en relación con la esencial actividad des-encubridora del Dasein. Así, la reflexión respecto de la angustia se enmarca en el proyecto trascendental de la fenomenología, aun desde la renovación hermenéutica operada por Heidegger. La angustia podría ser entonces una forma preteórica de reducción, lo que aquí se llamará reducción ontológica. De esta manera, la angustia pone en valor las disposiciones afectivas en el proyecto alético, siempre inacabado, de pensar lo hasta ahora no pensado. Palabras clave: Angustia, fenomenología trascendental, hermenéutica, reducción ontológica. Abstract The ability of anguish to reveal the hidden is, evidently, in relation to the essential uncovering activity of Dasein. This proposal continues the transcendental perspective of phenomenology even from the Heidegger's hermeneutic renewal. Anguish could be a pre-theoretical way of reduction; what we will call here ontological reduction. In this way, the anguish puts in value the affective dispositions in the project of thinking something which, until now, has not been thought.