Peter Wieringa - Academia.edu (original) (raw)

Papers by Peter Wieringa

Medical & Biological Engineering & Computing, 1995

The conventional approach to develop PE) control seems to perform very well in most occasions. Ho... more The conventional approach to develop PE) control seems to perform very well in most occasions. However, sometimes a need exists for a more advanced method, e.g. fuzzy control. Studies pointed out the capability of fuzzy control to outdo the results of traditional PIDcontrol for complex, non-linear processes. Surprisingly, fuzzy control is however hardly applied in practice by installation companies as Honeywell IAC. One of the causes are the very high efforts needed to design a fuzzy controller.

Proceedings of the 4th World Congress on Intelligent Control and Automation (Cat. No.02EX527)

The role of human operators in supervised automation system is analysed. Human limitations in sup... more The role of human operators in supervised automation system is analysed. Human limitations in supervisory control are summarised based on the study of human model and human-machine interaction. Although it is arguably advantageous if some tasks are assigned to a human operator rather than an automation system, it is shown that the number of linked subsystems should be limited. The implications of this study are also discussed.

American Journal of Physiology-Heart and Circulatory Physiology, 1993

Heterogeneity in the hypoxic state of Tyrode-perfused rat hearts was studied using NADH and Pd-po... more Heterogeneity in the hypoxic state of Tyrode-perfused rat hearts was studied using NADH and Pd-porphine videofluorometry. Ischemic as well as high-flow anoxia resulted in a homogeneous rise of tissue NADH fluorescence, whereas normoxic recovery from both types of anoxia caused transiently persisting patchy fluorescent areas. Patterns were always the same for a given heart. PO2 distribution in the vasculature measured by Pd-porphine phosphorescence showed patterns similar to the NADH fluorescence patterns. Microsphere embolization of the capillaries, but not of arterioles, elicited identical NADH fluorescence patterns as seen during recovery from anoxia without microspheres. High heartbeat rates also caused patchy fluorescent areas but not in the presence of adenosine. Patterns corresponded to those seen during normoxic recovery from anoxia under low beat rates. It is concluded that there are circulatory units in the rat heart at the capillary level that result in the temporary persi...

Transactions of the Institute of Measurement and Control, 1999

A brief overview of theoretical, experimental and industrial issues that are typical for studies ... more A brief overview of theoretical, experimental and industrial issues that are typical for studies on human-machine systems is given. The paper distinguishes three human-machine interaction modes: direct control, intermittent control and supervisory control. It is shown that a technology-driven engineering approach drives human-machine interaction out of the loop. It is challenging to use developments, such as multimedia, for all control modes, to enhance rather than abolish human-machine interaction. Design of any of the control modes requires a human-centred design approach. This overview refers to other papers in a series dedicated to human-machine systems.

Simulation Modelling Practice and Theory, 2012

American Journal of Physiology-Cell Physiology, 1984

The viscoelastic behavior of single resting vascular smooth muscle cells from bovine coronary art... more The viscoelastic behavior of single resting vascular smooth muscle cells from bovine coronary artery was studied. No maintained passive force could be recorded, even when the cells were stretched to two to four times their initial length; this finding suggests that the smooth muscle cells do not contribute to the parallel elastic component in arterial smooth muscle tissue. The force during stretch of resting arterial cells was proportional to the rate of stretch (which varied between 20 and 60% of the initial length per second). This linear viscous resistance was also found for toad stomach cells when similar stretches were applied. The stress-relaxation curves of the arterial cells could be fitted to the sum of two exponential components (with half-lives of 13.1 and 0.5 s, respectively). As a result of the above findings, a model consisting of two viscoelastic elements in parallel was proposed for a single resting arterial smooth muscle cell. The viscous resistance to stretch of re...

The Journal of Physiology, 1995

IFAC Proceedings Volumes, 1993

IFAC Proceedings Volumes, 2001

Spatial orientation in a Virtual Environment (VE) depends on visual recognition and on path integ... more Spatial orientation in a Virtual Environment (VE) depends on visual recognition and on path integration meaning that the traversed path is integrated from feedback stimuli (visual, vestibular, and kinesthetic). Which stimuli are available, depends on whether an immersive interface is used with head-slaved movement or a non-immersive interface is used with indirect control of movement. Spatial orientation performance is investigated for both interfaces in two experiments. First, only path integration is investigated with different combinations of visual, vestibular, and kinesthetic feedback. Results show that an immersive interface that provides kinesthetic feedback improves path integration. Second, spatial leaming is investigated for the different interfaces with both visual recognition and path integration. With an immersive interface the VE is leamed faster than with a non-immersive interface. Copyright © 2001 IFAC

IFAC Proceedings Volumes, 2003

IFAC Proceedings Volumes, 2001

Verification and Validation of Complex Systems: Human Factors Issues, 1993

In his book about chaos, Gleick (1988) describes how the meteorologist E. Lorenz in 1961 found th... more In his book about chaos, Gleick (1988) describes how the meteorologist E. Lorenz in 1961 found that small numerical errors in the initial conditions for his deterministic model of the weather could unfold into simulated catastrophes. A similar threat is real for automated large scale systems that contain deterministic subsystems whose behavior is described by difference equations. The appreciation that small errors in the design, measuring device, or (human) control action are also subject to the so-called Butterfly Effect induces stress upon the human supervisory task.

European Journal of Transport and Infrastructure Research

1997 IEEE International Conference on Systems, Man, and Cybernetics. Computational Cybernetics and Simulation, 1997

ABSTRACT

Advances in Experimental Medicine and Biology, 1985

The interconnectedness of the capillary network gives rise to a heterogeneous capillary fow distr... more The interconnectedness of the capillary network gives rise to a heterogeneous capillary fow distribution. Model studies have demonstrated that at normal overall perfusion some capillaries may receive no or little flow. However, capillary flow is an important factor in determining the degree of metabolic supply to adjacent tissue cells. Since the work of Krogh (1918), oxygen transport in capillary systems and tissue has been studied intensively. In the present model known non-linearities, such as the oxygen binding by the erythrocytes, the consumption rate in tissue cells and the resistance to diffusion of the capillary wall and cell membranes, are linearized. On the other hand the often oversimplified capillary network and capillary flow distribution have been added to the model allowing the study of convective mixing of confluent capillary blood flow. This is important for the description of tissue supply distal from a bifurcation. Moreover, the intercapillary distance in several organs is small, permitting diffusional shunting. The present three dimensional capillary and tissue network model has been based on observations of casts of the myocardial microcirculation (Bassingthwaighte et al., 1974; Tomanek et al., 1982).

Medical & Biological Engineering & Computing, 1995

The conventional approach to develop PE) control seems to perform very well in most occasions. Ho... more The conventional approach to develop PE) control seems to perform very well in most occasions. However, sometimes a need exists for a more advanced method, e.g. fuzzy control. Studies pointed out the capability of fuzzy control to outdo the results of traditional PIDcontrol for complex, non-linear processes. Surprisingly, fuzzy control is however hardly applied in practice by installation companies as Honeywell IAC. One of the causes are the very high efforts needed to design a fuzzy controller.

Proceedings of the 4th World Congress on Intelligent Control and Automation (Cat. No.02EX527)

The role of human operators in supervised automation system is analysed. Human limitations in sup... more The role of human operators in supervised automation system is analysed. Human limitations in supervisory control are summarised based on the study of human model and human-machine interaction. Although it is arguably advantageous if some tasks are assigned to a human operator rather than an automation system, it is shown that the number of linked subsystems should be limited. The implications of this study are also discussed.

American Journal of Physiology-Heart and Circulatory Physiology, 1993

Heterogeneity in the hypoxic state of Tyrode-perfused rat hearts was studied using NADH and Pd-po... more Heterogeneity in the hypoxic state of Tyrode-perfused rat hearts was studied using NADH and Pd-porphine videofluorometry. Ischemic as well as high-flow anoxia resulted in a homogeneous rise of tissue NADH fluorescence, whereas normoxic recovery from both types of anoxia caused transiently persisting patchy fluorescent areas. Patterns were always the same for a given heart. PO2 distribution in the vasculature measured by Pd-porphine phosphorescence showed patterns similar to the NADH fluorescence patterns. Microsphere embolization of the capillaries, but not of arterioles, elicited identical NADH fluorescence patterns as seen during recovery from anoxia without microspheres. High heartbeat rates also caused patchy fluorescent areas but not in the presence of adenosine. Patterns corresponded to those seen during normoxic recovery from anoxia under low beat rates. It is concluded that there are circulatory units in the rat heart at the capillary level that result in the temporary persi...

Transactions of the Institute of Measurement and Control, 1999

A brief overview of theoretical, experimental and industrial issues that are typical for studies ... more A brief overview of theoretical, experimental and industrial issues that are typical for studies on human-machine systems is given. The paper distinguishes three human-machine interaction modes: direct control, intermittent control and supervisory control. It is shown that a technology-driven engineering approach drives human-machine interaction out of the loop. It is challenging to use developments, such as multimedia, for all control modes, to enhance rather than abolish human-machine interaction. Design of any of the control modes requires a human-centred design approach. This overview refers to other papers in a series dedicated to human-machine systems.

Simulation Modelling Practice and Theory, 2012

American Journal of Physiology-Cell Physiology, 1984

The viscoelastic behavior of single resting vascular smooth muscle cells from bovine coronary art... more The viscoelastic behavior of single resting vascular smooth muscle cells from bovine coronary artery was studied. No maintained passive force could be recorded, even when the cells were stretched to two to four times their initial length; this finding suggests that the smooth muscle cells do not contribute to the parallel elastic component in arterial smooth muscle tissue. The force during stretch of resting arterial cells was proportional to the rate of stretch (which varied between 20 and 60% of the initial length per second). This linear viscous resistance was also found for toad stomach cells when similar stretches were applied. The stress-relaxation curves of the arterial cells could be fitted to the sum of two exponential components (with half-lives of 13.1 and 0.5 s, respectively). As a result of the above findings, a model consisting of two viscoelastic elements in parallel was proposed for a single resting arterial smooth muscle cell. The viscous resistance to stretch of re...

The Journal of Physiology, 1995

IFAC Proceedings Volumes, 1993

IFAC Proceedings Volumes, 2001

Spatial orientation in a Virtual Environment (VE) depends on visual recognition and on path integ... more Spatial orientation in a Virtual Environment (VE) depends on visual recognition and on path integration meaning that the traversed path is integrated from feedback stimuli (visual, vestibular, and kinesthetic). Which stimuli are available, depends on whether an immersive interface is used with head-slaved movement or a non-immersive interface is used with indirect control of movement. Spatial orientation performance is investigated for both interfaces in two experiments. First, only path integration is investigated with different combinations of visual, vestibular, and kinesthetic feedback. Results show that an immersive interface that provides kinesthetic feedback improves path integration. Second, spatial leaming is investigated for the different interfaces with both visual recognition and path integration. With an immersive interface the VE is leamed faster than with a non-immersive interface. Copyright © 2001 IFAC

IFAC Proceedings Volumes, 2003

IFAC Proceedings Volumes, 2001

Verification and Validation of Complex Systems: Human Factors Issues, 1993

In his book about chaos, Gleick (1988) describes how the meteorologist E. Lorenz in 1961 found th... more In his book about chaos, Gleick (1988) describes how the meteorologist E. Lorenz in 1961 found that small numerical errors in the initial conditions for his deterministic model of the weather could unfold into simulated catastrophes. A similar threat is real for automated large scale systems that contain deterministic subsystems whose behavior is described by difference equations. The appreciation that small errors in the design, measuring device, or (human) control action are also subject to the so-called Butterfly Effect induces stress upon the human supervisory task.

European Journal of Transport and Infrastructure Research

1997 IEEE International Conference on Systems, Man, and Cybernetics. Computational Cybernetics and Simulation, 1997

ABSTRACT

Advances in Experimental Medicine and Biology, 1985

The interconnectedness of the capillary network gives rise to a heterogeneous capillary fow distr... more The interconnectedness of the capillary network gives rise to a heterogeneous capillary fow distribution. Model studies have demonstrated that at normal overall perfusion some capillaries may receive no or little flow. However, capillary flow is an important factor in determining the degree of metabolic supply to adjacent tissue cells. Since the work of Krogh (1918), oxygen transport in capillary systems and tissue has been studied intensively. In the present model known non-linearities, such as the oxygen binding by the erythrocytes, the consumption rate in tissue cells and the resistance to diffusion of the capillary wall and cell membranes, are linearized. On the other hand the often oversimplified capillary network and capillary flow distribution have been added to the model allowing the study of convective mixing of confluent capillary blood flow. This is important for the description of tissue supply distal from a bifurcation. Moreover, the intercapillary distance in several organs is small, permitting diffusional shunting. The present three dimensional capillary and tissue network model has been based on observations of casts of the myocardial microcirculation (Bassingthwaighte et al., 1974; Tomanek et al., 1982).