Ralf Lehmann

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Gigabit networks can not be fully utilized by today's end systems. The processing requirements of next generation network protocols with enabled encryption features will aggravate this situation. To overcome these shortcomings this paper presents an approach and prototype implementation for hardware support of IP/IPsec protocols. We outline a(More)
BACKGROUND AND AIMS The prevalence of hepatitis C virus (HCV) antibodies in Germany has been estimated to be in the range of 0.4-0.63%. Screening for HCV is recommended in patients with elevated ALT levels or significant risk factors for HCV transmission only. However, 15-30% of patients report no risk factors and ALT levels can be normal in up to 20-30% of(More)
BACKGROUND Bleeding events after percutaneous coronary interventions (PCI) are associated with patients' age, gender, and the presence of chronic kidney disease, antithrombotic treatment, as well as arterial access site. Patients being treated by PCI using radial access site are associated with an improved prognosis. However, the safety of femoral closure(More)
Current high speed networks cannot be fully utilized by to-day's high end systems. The processing requirements of next generation network protocols require intelligent network cards with network protocol offload engines, for example based on a network processor. To reduce development time, we reuse existing software protocol stack implementations for(More)
BACKGROUND The adoption of the transradial (TR) approach over the traditional transfemoral (TF) approach has been hampered by concerns of increased radiation exposure-a subject of considerable debate within the field. We performed a patient-level, multi-center analysis to definitively address the impact of TR access on radiation exposure. METHODS AND(More)
BACKGROUND Implantation of left atrial appendage (LAA) occlusion devices was shown to be a feasible and effective alternative to oral anticoagulation in patients with non-valvular atrial fibrillation. However, only few data about in-hospital and peri-procedural data are currently available. This study aims to report about echocardiographic, procedural and(More)
Intraventricular septum-hematoma is a rare complication following percutaneous coronary intervention (PCI). This complication may represent a challenge for accurate diagnosis and treatment. This case report is about a 60-year-old male patient being admitted with an acute coronary syndrome. Despite successful PCI with drug eluting stent implantation into the(More)
Todays networks are characterized by heterogeneous environments. Various transmission techniques coexist and offer different bandwidths at different costs. Because of video conferences and similiar applications becoming more and more important this paper presents the architecture of the video communication system " XNetvideo " , which is sca-lable in terms(More)
Current high speed networks cannot be fully utilized by today's high end systems. The processing requirements of applications and advanced services or security processing aggravate this situation. To overcome these shortcomings intelligent network cards with network protocol offload engines, for example based on a network processor, are necessary. To reduce(More)
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