Learn More
HeiTS, the Heidelberg Transport System, is a multimedia communication system for real-time delivery of digital audio and video. HeiTS operates on top of guaranteed-performance networks that apply resource reservation techniques. To make HeiTS also work with networks for which no reservation scheme can be realized (for example, Ethernet or existing(More)
Biodegradation of anthropogenic pollutants in shallow aquifers is an important microbial ecosystem service which is mainly brought about by indigenous anaerobic microorganisms. For the management of contaminated sites, risk assessment and control of natural attenuation, the assessment of in situ biodegradation and the underlying microbial processes is(More)
Although efforts on reservation protocols for internetworks started quite some time ago, the research community is now becoming particularly active in this area, as proved by the high interest generated by protocols such as ST-II and RSVP. These two protocols, starting from different assumptions, have the common goal of providing guaranteed communication by(More)
Multimedia systems must be able to support a certain quality of service (QoS) to satisfy the stringent real-time performance requirements of their applications. HeiRAT, the Heidelberg Resource Administration Technique , is a comprehensive QoS management system that was designed and implemented in connection with a distributed multimedia platform for(More)
Multimedia applications handling audio and video data have to obey time characteristics of these media types. Besides a basic functionality to express time relations, correctness with respect to time constraints requires mechanisms which lead to favored processing of multimedia operations. CPU scheduling techniques based on the experience from real-time(More)
Benzene is a widespread and toxic contaminant. The fate of benzene in contaminated aquifers seems to be primarily controlled by the abundance of oxygen: benzene is aerobically degraded at high rates by ubiquitous microorganisms, and the oxygen-dependent pathways for its breakdown were elucidated more than 50 years ago. In contrast, benzene was thought to be(More)
Due to the time characteristics of audio and video data, the processing of multimedia applications has to be done using real-time mechanisms. Scheduling algorithms used within such systems require information about the processing time requirements, the CPU utilization of the applications, to perform schedulability tests. Since multimedia applications are(More)
BTEX compounds such as benzene are frequent soil and groundwater contaminants that are easily biodegraded under oxic conditions by bacteria. In contrast, benzene is rather recalcitrant under anaerobic conditions. The analysis of anoxic degradation is often hampered by difficult sampling conditions, limited amounts of biomass and interference of matrix(More)