Abstract. This paper discusses the use of formal methods in the development of the control system... more Abstract. This paper discusses the use of formal methods in the development of the control system for the Maeslant Kering. The Maeslant Kering is the movable dam which has to protect Rotterdam from floodings while, at (almost) the same time, not restricting ship traffic to the port of Rotterdam. The control system, called Bos, completely autonomously decides about closing and opening of the barrier and, when necessary, also performs these tasks without human intervention. Bos is a safety-critical software system of the highest Safety Integrity Level according to IEC 61508. One of the reliability increasing techniques used during its development is formal methods. This paper reports experiences obtained from using formal methods in the development of Bos. These experiences are presented in the context of Hall’s famous “Seven Myths of Formal Methods”.
There is provided a system for Gewebsuntersuchung having a console including a light source, a li... more There is provided a system for Gewebsuntersuchung having a console including a light source, a light detector and / or a spectrometer, an optical switch and a processing unit. The system further includes an elongated shaft, wherein an illumination fiber, a plug in front of the illumination fiber and a detection fiber are provided in the elongated shaft. The illumination fiber is capable of transmitting light from the light source to its front surface, and is capable of light which is reflected back from plug, to be transmitted to the optical switch. The detection fiber is able to transmit reflected light to the optical switch fabric from the distal end face of the elongate shaft. The optical switch is configured to provide the return reflected light to the spectrometer to produce a reference spectrum, and the light reflected from the tissue to provide light to the spectrometer to generate a diffuse reflectance spectrum. The processing unit is configured to generate a tissue spectrum...
A generalized algorithm has been derived for the execution of the Cooley-Tukey FFT algorithm on a... more A generalized algorithm has been derived for the execution of the Cooley-Tukey FFT algorithm on a distributed memory machine. This algorithm is based on an approach that combines a large number of butterfly operations into one large process per processor. The performance can be predicted from theory. The actual algorithm has been implemented on a transputer array, and the performance of the implementation has been measured for various sizes of the complex input vector. It is shown that the algorithm scales linearly with the number of transputers and the problem size.
This paper discusses the use of formal methods in the development of the control system for the M... more This paper discusses the use of formal methods in the development of the control system for the Maeslant Kering. The Maeslant Kering is the movable dam which has to protect Rotterdam from floodings while, at (almost) the same time, not restricting ship traffic to the port of Rotterdam. The control system, called BOS, completely autonomously decides about closing and opening
The design of a control system is not finished with the derivation of the necessary control algor... more The design of a control system is not finished with the derivation of the necessary control algorithms. When the controller is implemented in a digital computer the system designer has to schedule all control and calculation tasks within the sampling interval of the system. Higher sampling frequencies often improve the system performance.
Proceedings. EUROMICRO `91 Workshop on Real-Time Systems, 1991
The described operating environment which is used for robot control, will be embedded in a larger... more The described operating environment which is used for robot control, will be embedded in a larger high level transputer operating system.
Abstract. This paper discusses the use of formal methods in the development of the control system... more Abstract. This paper discusses the use of formal methods in the development of the control system for the Maeslant Kering. The Maeslant Kering is the movable dam which has to protect Rotterdam from floodings while, at (almost) the same time, not restricting ship traffic to the port of Rotterdam. The control system, called Bos, completely autonomously decides about closing and opening of the barrier and, when necessary, also performs these tasks without human intervention. Bos is a safety-critical software system of the highest Safety Integrity Level according to IEC 61508. One of the reliability increasing techniques used during its development is formal methods. This paper reports experiences obtained from using formal methods in the development of Bos. These experiences are presented in the context of Hall’s famous “Seven Myths of Formal Methods”.
There is provided a system for Gewebsuntersuchung having a console including a light source, a li... more There is provided a system for Gewebsuntersuchung having a console including a light source, a light detector and / or a spectrometer, an optical switch and a processing unit. The system further includes an elongated shaft, wherein an illumination fiber, a plug in front of the illumination fiber and a detection fiber are provided in the elongated shaft. The illumination fiber is capable of transmitting light from the light source to its front surface, and is capable of light which is reflected back from plug, to be transmitted to the optical switch. The detection fiber is able to transmit reflected light to the optical switch fabric from the distal end face of the elongate shaft. The optical switch is configured to provide the return reflected light to the spectrometer to produce a reference spectrum, and the light reflected from the tissue to provide light to the spectrometer to generate a diffuse reflectance spectrum. The processing unit is configured to generate a tissue spectrum...
A generalized algorithm has been derived for the execution of the Cooley-Tukey FFT algorithm on a... more A generalized algorithm has been derived for the execution of the Cooley-Tukey FFT algorithm on a distributed memory machine. This algorithm is based on an approach that combines a large number of butterfly operations into one large process per processor. The performance can be predicted from theory. The actual algorithm has been implemented on a transputer array, and the performance of the implementation has been measured for various sizes of the complex input vector. It is shown that the algorithm scales linearly with the number of transputers and the problem size.
This paper discusses the use of formal methods in the development of the control system for the M... more This paper discusses the use of formal methods in the development of the control system for the Maeslant Kering. The Maeslant Kering is the movable dam which has to protect Rotterdam from floodings while, at (almost) the same time, not restricting ship traffic to the port of Rotterdam. The control system, called BOS, completely autonomously decides about closing and opening
The design of a control system is not finished with the derivation of the necessary control algor... more The design of a control system is not finished with the derivation of the necessary control algorithms. When the controller is implemented in a digital computer the system designer has to schedule all control and calculation tasks within the sampling interval of the system. Higher sampling frequencies often improve the system performance.
Proceedings. EUROMICRO `91 Workshop on Real-Time Systems, 1991
The described operating environment which is used for robot control, will be embedded in a larger... more The described operating environment which is used for robot control, will be embedded in a larger high level transputer operating system.
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