Jochen Maass

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Background: Acute pyelonephritis is a potential cause of kidney scars. Aim: To evaluate the relationship between clinical, laboratory and imaging data and the development of kidney scars in acute pyelonephritis. Methods: All consecutive patients hospitalized for acute uncomplicated pyelonephritis in our nephrology unit from June 1996 to June 2004 were(More)
The task frame formalism allows the programmer to overcome the drawbacks of the traditional robot oriented assembly programming, moving the programmer’s focus on the robot task. Additionally skill primitives contribute to a more natural programming paradigm. In this paper a robot control architecture is presented that implements both of these concepts(More)
In this paper, we present work about robot control architecture, assembly planning and task planning for manufacturing robots. The interface between an offline planning unit and control systems is handled with skill primitives. Thus, skill primitives and skill primitive nets are explained in detail. Our long term aim is to combine robot control with task(More)
The aim of this study was to compare unenhanced MRI, MnDPDP-enhanced MRI, and spiral CT in the detection of hepatic colorectal metastases. Forty-four patients with hepatic colorectal metastases were examined with unenhanced and MnDPDP-enhanced MRI and with unenhanced and contrast-enhanced spiral CT. The MR examination protocol included baseline T1-weighted(More)
Digital motion control requires precise and low-noise velocity information. Since this velocity information must be calculated from position encoders in each control cycle, time efficiency of these algorithms is a very important design goal. Additionally, it is required that these algorithms operate over wide ranges of both velocity and acceleration.(More)
Machine supervision on parallel robots demand a powerful online singularity loci prediction. To detect the entrance of the end-effector on direct kinematic singularities that constrain the internal workspace is not trivial for parallel robots with five or six degrees of freedom. This paper presents a strategy to safely drive a Hexa parallel robot out of(More)
Multicore platforms are such that have one physical processor chip with multiple cores interconnected via a chip level bus. Because they deliver a greater computing power through concurrency, offer greater system density multicore platforms provide best qualifications to address the performance bottleneck encountered in PC-based control systems for parallel(More)