A major source of performance degradation in highperformance distributed applications has been attributed to poor end-to-end TCP performance. The root causes of poor TCP performance are difficult to isolate and diagnose, and the efficacy of tuning efforts are often difficult to gauge. This paper describes some sources of poor TCP performance, and describes a method to diagnose some of these pro...

Project Solutions. Increasing responsiveness is often dealt against decreasing another valuable resource. As responsiveness is a quality, the most significant resources in a software project to trade off are scope, cost, time, and other quality aspects. In a lot of systems, namely “embedded systems”, software is an integral part, but only one part of the system. Here trade-offs against hardware...

Recent research on managing complex computing systems has focused on the autonomic computing vision: Systems should manage themselves according to high level administrative goals [5]. As an example, system components should monitor the environment and self-tune to meet quality of service expectations, without requiring manual intervention in selecting concrete configuration options or in coordi...

The synchronous tuning of the self-oscillating wireless power transfer (WPT) in a close-coupling condition is studied in this paper. The Hamel locus is applied to predict the self-oscillating points in the WPT system. In order to make the system operate stably at the most efficient point, which is the middle resonant point when there are middle resonant and split frequency points caused by freq...

The performance optimization of scientific applications usually requires an in-depth knowledge of the hardware and software. A performance tuning mechanism is suggested to automatically tune OpenACC parameters to adapt to the execution environment on a given system. A historic learning based methodology is suggested to prune the parameter search space for a more efficient auto-tuning process. T...

The self-tuning dynP scheduler for modern cluster resource management systems switches between different basic scheduling policies dynamically during run time. This allows to react on changing characteristics of the waiting jobs. In this paper we present enhancements to the decision process of the self-tuning dynP scheduler and evaluate their impact on the performance: (i) While doing a self-tu...

Nowadays, using advanced vehicle control and safety systems in vehicles is growing rapidly. In this regard, in recent years new control systems, called VDC, have been introduced. These systems stabilize vehicle yaw motion, by yaw moment resulted from tire controlling forces. In this paper, an adaptive optimal controller applied to a vehicle to obtain a satisfactory lateral and yaw stability. To...

We study the behaviour of the Ben-Yishai hypercolumn model (Ben-Yishai et al., Proc. Natl. Acad. Sci. USA 92 (1995) 3844) under presentation of oriented stimuli, having extended this model by including plastic a!erent (LGN to cortex) connections. We "nd that Hebbian plasticity creates a self-organising map and show that constraining or modifying the standard Hebb rule in a particular way will l...