Ali Alouani - Academia.edu (original) (raw)
Papers by Ali Alouani
Sensors (Basel, Switzerland), Jan 2, 2018
Following hospital discharge, millions of patients continue to recover outside formal healthcare ... more Following hospital discharge, millions of patients continue to recover outside formal healthcare organizations (HCOs) in designated transitional care periods (TCPs). Unplanned hospital readmissions of patients during TCPs adversely affects the quality and cost of care. In order to reduce the rates of unplanned hospital readmissions, we propose a real-time patient-centric system, built around applications, to assist discharged patients in remaining at home or in the workplace while being supported by care providers. Discrete-event system modeling techniques and supervisory control theory play fundamental roles in the system's design. Simulation results and analysis show that the proposed system can be effective in documenting a patient's condition and health-related behaviors. Most importantly, the system tackles the problem of unplanned hospital readmissions by supporting discharged patients at a lower cost via home/workplace monitoring without sacrificing the quality of care.
[1991 Proceedings] The Twenty-Third Southeastern Symposium on System Theory, 2000
The dynamics and measurement models of a system must be known in order to apply the Kahlman filte... more The dynamics and measurement models of a system must be known in order to apply the Kahlman filter. For some practical applications, an algebraic constraint of the components of system state vector is also known or can be assumed. The tracking of constant speed targets that have orthogonal velocity and acceleration vectors is an example. Thus, for constant speed targets
Nasa Sti Recon Technical Report N, Nov 1, 1991
ABSTRACT
Proceedings of Spie the International Society For Optical Engineering, 2001
ABSTRACT
Proceedings of Spie the International Society For Optical Engineering, 2005
This paper solves a general track fusion problem with feedback when the sensors used are asynchro... more This paper solves a general track fusion problem with feedback when the sensors used are asynchronous, communication delays exist between sensor platforms and track fusion center, and tracks may arrive out- of-sequence. For the proposed linear fusion rule, the solution is shown to be optimal in the minimum mean square sense. The batch processing of incoming tracks provides an elegant solution for the out-of-sequence and latent tracks without special processing of such data.
Proceedings of SPIE - The International Society for Optical Engineering
ABSTRACT
Proceedings of SPIE - The International Society for Optical Engineering
ABSTRACT
Proceedings The Twenty-Ninth Southeastern Symposium on System Theory, 1997
ABSTRACT
Proceedings of Thirtieth Southeastern Symposium on System Theory, 1998
ABSTRACT
Proceedings of Thirtieth Southeastern Symposium on System Theory, 1998
Uses wavelet representation to provide a new linear scale autoregressive (LSA) model for images. ... more Uses wavelet representation to provide a new linear scale autoregressive (LSA) model for images. This modeling approach takes advantage of the information contained in the lower resolutions as well as of the information contained in the detailed images. Detailed images are available from information provided by the wavelet decomposition. It is expected that the proposed model will lead to an improved LSA model, which in turn further enhances the quality of multiscale-based image processing applications. Test images are used to illustrate the benefits of the new modeling approach
Proceedings of 1994 American Control Conference - ACC '94, 1994
In multisensor tracking systems where sensors process their data locally to produce local tracks,... more In multisensor tracking systems where sensors process their data locally to produce local tracks, these tracks are communicated to a central location where track fusion is performed. The conditional dependency of these tracks make the track fusion problem difficult to solve whenever a globally optimal solution is sought. This paper addresses the issue of optimal track fusion for similar and
Electric Power Systems Research, 1996
The objective of this paper is to design nonlinear excitation controllers for single-machine infi... more The objective of this paper is to design nonlinear excitation controllers for single-machine infinite-bus power systems. Because of the nonlinear nature of such systems, nonlinear controllers are more effective in providing larger stability margins than their linear counterparts. To take advantage of well-developed linear control techniques, the concept of feedback linearization is used. A characterization of the region over which the linearizing state transformation is guaranteed to be diffeomorphic is provided. Also, a new formulation for the linear controller design is provided to solve the problem of the terminal voltage regulation. Simulation results of a single-machine infinite-bus power system indicate that in the presence of major disturbances the proposed controller outperforms existing linear and nonlinear controllers in maintaining the system's stability, in damping the rotor angle oscillations, and in reaching the desired performance during postfault operations.
Acquisition, Tracking, and Pointing XII, 1998
ABSTRACT
Optimal Control Applications and Methods, 1997
Sensor data fusion has long been recognized as a means to improve target tracking. Common practic... more Sensor data fusion has long been recognized as a means to improve target tracking. Common practice assumes that the sensors used are synchronous, i.e., they have identical data rate, measurements are taken at the same time, and have no communication delays between sensors platform and central processing center. Such assumptions are invalid in practice. Previous work of the authors dealt designing asynchronous track fusion filter that removes such assumptions when considering the multi-sensor target tracking case. This paper deals with the existence of a solution to the asynchronous track fusion problem for the case of three asynchronous sensors. In addition, the performance deterioration of the filter is analyzed as a function of the track fusion update rate for CV targets.
Sensors (Basel, Switzerland), Jan 2, 2018
Following hospital discharge, millions of patients continue to recover outside formal healthcare ... more Following hospital discharge, millions of patients continue to recover outside formal healthcare organizations (HCOs) in designated transitional care periods (TCPs). Unplanned hospital readmissions of patients during TCPs adversely affects the quality and cost of care. In order to reduce the rates of unplanned hospital readmissions, we propose a real-time patient-centric system, built around applications, to assist discharged patients in remaining at home or in the workplace while being supported by care providers. Discrete-event system modeling techniques and supervisory control theory play fundamental roles in the system's design. Simulation results and analysis show that the proposed system can be effective in documenting a patient's condition and health-related behaviors. Most importantly, the system tackles the problem of unplanned hospital readmissions by supporting discharged patients at a lower cost via home/workplace monitoring without sacrificing the quality of care.
[1991 Proceedings] The Twenty-Third Southeastern Symposium on System Theory, 2000
The dynamics and measurement models of a system must be known in order to apply the Kahlman filte... more The dynamics and measurement models of a system must be known in order to apply the Kahlman filter. For some practical applications, an algebraic constraint of the components of system state vector is also known or can be assumed. The tracking of constant speed targets that have orthogonal velocity and acceleration vectors is an example. Thus, for constant speed targets
Nasa Sti Recon Technical Report N, Nov 1, 1991
ABSTRACT
Proceedings of Spie the International Society For Optical Engineering, 2001
ABSTRACT
Proceedings of Spie the International Society For Optical Engineering, 2005
This paper solves a general track fusion problem with feedback when the sensors used are asynchro... more This paper solves a general track fusion problem with feedback when the sensors used are asynchronous, communication delays exist between sensor platforms and track fusion center, and tracks may arrive out- of-sequence. For the proposed linear fusion rule, the solution is shown to be optimal in the minimum mean square sense. The batch processing of incoming tracks provides an elegant solution for the out-of-sequence and latent tracks without special processing of such data.
Proceedings of SPIE - The International Society for Optical Engineering
ABSTRACT
Proceedings of SPIE - The International Society for Optical Engineering
ABSTRACT
Proceedings The Twenty-Ninth Southeastern Symposium on System Theory, 1997
ABSTRACT
Proceedings of Thirtieth Southeastern Symposium on System Theory, 1998
ABSTRACT
Proceedings of Thirtieth Southeastern Symposium on System Theory, 1998
Uses wavelet representation to provide a new linear scale autoregressive (LSA) model for images. ... more Uses wavelet representation to provide a new linear scale autoregressive (LSA) model for images. This modeling approach takes advantage of the information contained in the lower resolutions as well as of the information contained in the detailed images. Detailed images are available from information provided by the wavelet decomposition. It is expected that the proposed model will lead to an improved LSA model, which in turn further enhances the quality of multiscale-based image processing applications. Test images are used to illustrate the benefits of the new modeling approach
Proceedings of 1994 American Control Conference - ACC '94, 1994
In multisensor tracking systems where sensors process their data locally to produce local tracks,... more In multisensor tracking systems where sensors process their data locally to produce local tracks, these tracks are communicated to a central location where track fusion is performed. The conditional dependency of these tracks make the track fusion problem difficult to solve whenever a globally optimal solution is sought. This paper addresses the issue of optimal track fusion for similar and
Electric Power Systems Research, 1996
The objective of this paper is to design nonlinear excitation controllers for single-machine infi... more The objective of this paper is to design nonlinear excitation controllers for single-machine infinite-bus power systems. Because of the nonlinear nature of such systems, nonlinear controllers are more effective in providing larger stability margins than their linear counterparts. To take advantage of well-developed linear control techniques, the concept of feedback linearization is used. A characterization of the region over which the linearizing state transformation is guaranteed to be diffeomorphic is provided. Also, a new formulation for the linear controller design is provided to solve the problem of the terminal voltage regulation. Simulation results of a single-machine infinite-bus power system indicate that in the presence of major disturbances the proposed controller outperforms existing linear and nonlinear controllers in maintaining the system's stability, in damping the rotor angle oscillations, and in reaching the desired performance during postfault operations.
Acquisition, Tracking, and Pointing XII, 1998
ABSTRACT
Optimal Control Applications and Methods, 1997
Sensor data fusion has long been recognized as a means to improve target tracking. Common practic... more Sensor data fusion has long been recognized as a means to improve target tracking. Common practice assumes that the sensors used are synchronous, i.e., they have identical data rate, measurements are taken at the same time, and have no communication delays between sensors platform and central processing center. Such assumptions are invalid in practice. Previous work of the authors dealt designing asynchronous track fusion filter that removes such assumptions when considering the multi-sensor target tracking case. This paper deals with the existence of a solution to the asynchronous track fusion problem for the case of three asynchronous sensors. In addition, the performance deterioration of the filter is analyzed as a function of the track fusion update rate for CV targets.