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A GridPix detector is a gaseous detector capable of detecting individual single primary electrons from ionizing particles. Such a detector consists of a pixel chip as active anode covered with a thin layer of silicon rich silicon nitride (SiRN) for protection against discharges, an integrated amplification grid (InGrid), applied on top of the chip by wafer post processing techniques, and a cathode...
Understanding and discussing the security aspects of IT systems during their development is challenging for both domain specialists and IT experts - neglecting this aspect leads to communication problems and, eventually, to less secure systems. An important factor for these challenges is the distribution and variety of basic IT security concepts, attacks, and countermeasures, e.g., in the standard...
We present an analytical model combining geometric and stochastic approaches to describe the effects of attacks and countermeasures on MANETs. In particular, we focus on the packet loss that can be charged to the misbehavior as well as to the countermeasures as a primary metric. For this, we model the entire chain of (1) MANET routing, (2) attack, (3) intrusion detection, and (4) intrusion response...
Mitigating misbehavior in mobile ad hoc networks (MANET) requires effective intrusion response systems. In this work, we present an intrusion response scheme that is tailored to support the infrastructure less nature of MANETs. We propose a geographic solution towards excluding misbehaving nodes which is robust against address spoofing from the attacker. In particular, we investigate how an adaptive...
Central trusted instances as well as predefined security policies are not available in spontaneously established peer-to-peer environments. The former can be addressed by joint decision processes based on threshold cryptography. To compensate the latter, users can be involved directly in security- relevant decisions. In this case, minimizing the number of users involved is a necessary optimization...
We elaborate upon the usage of action language C for representing and reasoning about biological models. First, we provide a simple extension of C allowing for variables and show its usefulness in modeling biochemical reactions according to the well-known model of BIOCHAM. Second, we show how the biological action description language CTAID can be mapped onto C. Finally, we describe a toolbox for...
GridPix detector prototypes have been made using a TimePix pixel chip and a PSI 46 pixel chip. A system of discharge protection has been successfully tested. GridPix detectors have been tested using cosmic rays, a 90Sr source and the T9 test beam facility at CERN. GridPix detectors perform well for 3D track reconstruction, dE/dx measurements and transition radiation detection.
Delay tolerant applications allow time to be used as an additional degree of freedom for security mechanisms in mobile ad hoc networks. By introducing artificial delays for the communication of delay tolerant applications, we optimize the point in time for starting or continuing a transmission. We develop mechanisms to exploit the knowledge on the proximity of the sender, the receiver, and intermediate,...
In this paper a comparison of common single-phase and three-phase DC-DC resonant and non- resonant converter bridges on application level is carried out. Device stresses and efficiencies are qualified at constant transferred power and constant terminal voltages. As a result, this paper presents the predominance of three-phase topologies when talking about switching losses in silicon devices of non-resonant...
Hybrid intelligent sensor systems and networks are composed of modules of tightly co-operating software and hardware components. Bio-inspired information processing is embodied in algorithms as well as dedicated electronics for intelligent processing and system adaptation. This paper focuses on the challenges imposed on the small yet irreplaceable analog and mixed signal components in such a sensor...
Recently, evolvable hardware has been developed with the objective to deal with sensor electronics problems such as static and dynamic deviations. However the industrial specifications and requirements are not considered in the hardware-learning loop during the intrinsic optimization. Indeed, it minimizes the error between the required output and the real output generated by a given test signal. In...
Sensor electronics is ubiquitous in embedded systems, yet its performance is susceptible to static and dynamic deviations. Even costly and time consuming laser trimming still can't deal with all the occurring deviations. Recently, analog reconfigurable electronics offers a solution to compensate these effects. The state of the art uses genetic algorithm (GA) to find an arbitrary topology to fulfil...
It is widely recognized that significant energy savings could be expected through a widespread use of variable speed drives in motor driven systems. In order to widely implement this concept, the size and cost of the power electronics in drives are the key factors. One of the demonstrator programs of European Center for Power Electronics (ECPE) is focussing on achieving high power densities in converters...
The majority of virtual endoscopy techniques tries to simulate a real endoscopy. A real endoscopy does not always give the optimal information due to the physical limitations it is subject to. In this paper, we deal with the unfolding of the surface of the colon as a possible visualization technique for diagnosis and polyp detection. A new two-step technique is presented which deals with the problems...
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