A grower can only get a realistic assessment of the cost of production of a specific horticultural crop if he can register all the different tasks in cultivating that crop. BeTa is a programme which uses a simple barcode registration system to ascertain the time involved in different task areas. KuKa is an additional programme which uses the collected date from BeTa to give the grower a complet...

Software systems obey the 80/20 rule: aggressively optimizing a vital few execution paths yields large speedups. However, finding the vital few paths can be difficult, especially for large systems like web applications. This paper describes a novel approach to finding bottlenecks in such systems, given (possibly very large) profiles of system executions. In the approach, for each kind of profil...

Bottlenecks, the key ingredients for improving the performances of the production networks, have been profoundly studied during the last decade. Yet, because of the complexity of the research results, there is still a significant gap between theory and practice. In this paper, we review various bottleneck definitions, detection methods and the asymptotic results and provide a practical guidance...

We present the design, and preliminary performance results, for a system that transports uncompressed HDTV content over IP networks. Our system is motivated by the growth in use of digital video, and the ever increasing capacity of localand wide-area Internet links. We aim to demonstrate the feasibility of IP as a transport for very high quality video, and to highlight areas where performance b...

It is postulated that lane-changing vehicles create voids in traffic streams, and that these voids reduce flow. This mechanism is described with a model that tracks lane changers precisely, as particles endowed with realistic mechanical properties. The model has four easy-to-measure parameters and reproduces without re-calibration two bottleneck phenomena previously thought to be unrelated: (i)...

Multi-processing is a promising technique for improving the performance, scalability, and cost effectiveness of communication subsystems. Improving performance is becoming increasingly important to alleviate bottlenecks resulting from network transmission speeds that now often exceed the processing capacity of end-systems. This paper describes a modular framework for developing and experimentin...

After successful dynamic spectrum access, cognitive radio (CR) must be able to relay the message/packets to the destination node by utilizing existing primary system(s) (PS) and/or cooperative/cognitive radio nodes in the cognitive radio network. In this paper, we pioneer the exploration of the fundamental behaviors of interference between CRs and PS in such a relay network via network coding. ...

Home networks are seeing increased deployment of Wireless LAN (WiFi) links between conventional, gigabit/second wired Ethernet segments. This means an increasing number of internal bottlenecks, even as home networks are also expected to support latency-sensitive applications, regular TCP flows and an emerging class of low-priority, time-insensitive ‘background’ TCP flows. This paper explores th...