Hubert Martens - Academia.edu (original) (raw)
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Papers by Hubert Martens
Applied Physics Letters, 2000
Physical Review B, 1999
Transport of holes in poly(p-phenylene vinylene͒ has been studied as a function of frequency, tem... more Transport of holes in poly(p-phenylene vinylene͒ has been studied as a function of frequency, temperature, dc bias, and polymer thickness. For such a low mobility material we demonstrate that the specific frequency dependence of the response reflects the wide distribution in transit times of the injected carriers due to dispersive transport. The dc mobility is shown to correspond to the average of this dispersion and follows the empirical ln(dc)ϰͱE law. ͓S0163-1829͑99͒51736-0͔
A system (1) for determining the orientation 14 of the living body the medical stimulator (2) for... more A system (1) for determining the orientation 14 of the living body the medical stimulator (2) for the target (20). A; (6C 6A) the system comprises at least two stimulator device; a first bio-medical stimulator (2), and a stimulator device including a (4A 4C) (4A 4C) pre different time-varying electrical signal by the determined phase to the It comprises a generator 22 arranged to supply. The system stimulator elements (4A; 4C), the first known relative position (X; α) on the living body a medical stimulation device (2) arranged to detect a detection signal (8) from the sensor device 10 having a phase and the known relative position (X; α) of; the phase, the time-varying signal (6C 6A) detection of, and the detection signal (8) on the basis of to the bearing 14 of the first bio-medical stimulator (2) and a processor (12) arranged to determine a signal (8) is detected, where the stimulator elements (4A; 4C); originated from the (6C 6A) the time-varying electrical signal from the. The system defense of biological medical stimulator for the destination, that is, accurate determination of the angular position. This orientation is further accurately determined when the biometric medical stimulator is implanted in the subject. These systems are relatively cheap. The invention also relates to a method of determining the orientation 14 of the first bio-medical stimulator (2) for a target (20).
Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2010
Deep brain stimulation (DBS) therapy relies on electrical stimulation of neuronal elements in sma... more Deep brain stimulation (DBS) therapy relies on electrical stimulation of neuronal elements in small brain targets. However, the lack of fine spatial control over field distributions in current systems implies that stimulation easily spreads into adjacent structures that may induce adverse side-effects. This study investigates DBS field steering using a novel DBS lead design carrying a high-resolution electrode array. We apply computational models to simulate voltage distributions and DBS activation volumes in order to theoretically assess the potential of field steering in DBS. Our computational analysis demonstrates that the DBS-array is capable of accurately displacing activation volumes with sub-millimeter precision. Our findings demonstrate that future systems for DBS therapy may provide for more accurate target coverage than currently available systems achieve.
A device for recording information writes marks in a track on a record carrier of a writable type... more A device for recording information writes marks in a track on a record carrier of a writable type. The device records the information according to a predefined recording format like DVD for constituting a recording area containing user data preceded by a lead-in zone and followed by a lead-out zone located at the end of the user data. The device has a lead- out unit (36) for finalizing the record carrier for playback on a reading device for read-only type record carriers. The finalizing starts with determining if data written in the recording area extends up to a predefined physical position. If the data extends at least up to the predefined position, no lead-out information is recorded, and if not, lead-out information is recorded up to the predefined position.
Applied Physics Letters, 2000
Physical Review B, 1999
Transport of holes in poly(p-phenylene vinylene͒ has been studied as a function of frequency, tem... more Transport of holes in poly(p-phenylene vinylene͒ has been studied as a function of frequency, temperature, dc bias, and polymer thickness. For such a low mobility material we demonstrate that the specific frequency dependence of the response reflects the wide distribution in transit times of the injected carriers due to dispersive transport. The dc mobility is shown to correspond to the average of this dispersion and follows the empirical ln(dc)ϰͱE law. ͓S0163-1829͑99͒51736-0͔
A system (1) for determining the orientation 14 of the living body the medical stimulator (2) for... more A system (1) for determining the orientation 14 of the living body the medical stimulator (2) for the target (20). A; (6C 6A) the system comprises at least two stimulator device; a first bio-medical stimulator (2), and a stimulator device including a (4A 4C) (4A 4C) pre different time-varying electrical signal by the determined phase to the It comprises a generator 22 arranged to supply. The system stimulator elements (4A; 4C), the first known relative position (X; α) on the living body a medical stimulation device (2) arranged to detect a detection signal (8) from the sensor device 10 having a phase and the known relative position (X; α) of; the phase, the time-varying signal (6C 6A) detection of, and the detection signal (8) on the basis of to the bearing 14 of the first bio-medical stimulator (2) and a processor (12) arranged to determine a signal (8) is detected, where the stimulator elements (4A; 4C); originated from the (6C 6A) the time-varying electrical signal from the. The system defense of biological medical stimulator for the destination, that is, accurate determination of the angular position. This orientation is further accurately determined when the biometric medical stimulator is implanted in the subject. These systems are relatively cheap. The invention also relates to a method of determining the orientation 14 of the first bio-medical stimulator (2) for a target (20).
Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2010
Deep brain stimulation (DBS) therapy relies on electrical stimulation of neuronal elements in sma... more Deep brain stimulation (DBS) therapy relies on electrical stimulation of neuronal elements in small brain targets. However, the lack of fine spatial control over field distributions in current systems implies that stimulation easily spreads into adjacent structures that may induce adverse side-effects. This study investigates DBS field steering using a novel DBS lead design carrying a high-resolution electrode array. We apply computational models to simulate voltage distributions and DBS activation volumes in order to theoretically assess the potential of field steering in DBS. Our computational analysis demonstrates that the DBS-array is capable of accurately displacing activation volumes with sub-millimeter precision. Our findings demonstrate that future systems for DBS therapy may provide for more accurate target coverage than currently available systems achieve.
A device for recording information writes marks in a track on a record carrier of a writable type... more A device for recording information writes marks in a track on a record carrier of a writable type. The device records the information according to a predefined recording format like DVD for constituting a recording area containing user data preceded by a lead-in zone and followed by a lead-out zone located at the end of the user data. The device has a lead- out unit (36) for finalizing the record carrier for playback on a reading device for read-only type record carriers. The finalizing starts with determining if data written in the recording area extends up to a predefined physical position. If the data extends at least up to the predefined position, no lead-out information is recorded, and if not, lead-out information is recorded up to the predefined position.