This report deals with the design and evaluation of a \two-level" failure recovery scheme for distributed systems. In our previous work 30, 32], we motivated a \two-level" recovery approach that tolerates the more probable failures with a low overhead, and less probable failures with possibly higher overhead. The two-level approach can achieve a smaller overhead as compared to traditional recov...

This paper presents a multi-cell simulation approach with which the impact of selected link-level aspects on cellular system performance can be investigated. The investigations are carried out for downlink dedicated physical channels (DL-DPCH) of third-generation wideband CDMA (3G WCDMA), specified by 3GPP standardization body. The simulator incorporates a user equipment (UE) that suffers from ...

Both machine learning and rule based techniques have been extensively applied to performance rendering. However, relatively few systems make explicit use of machine learning combined with musical structure. Systems that use machine learning usually learn expression at note level. This paper introduces a performance rendering system that learns expression exclusively at a structural level. The s...

Block-level storage systems are commonly used due to their flexibility and versatility. Current technologies such as Storage Area Network (SAN) technologies over IP offer users the capability to consolidate and manage storage resources efficiently. However, scalability issues may arise under the load of many clients. A potential solution for this problem can be local disk caching. A blocklevel ...

To manage complexity and to shorten design time, systemlevel methods for specification and design are becoming more and more important. System-level methods and tools focus on the creation of executable models that describe a system in the earliest phases of the design process. They allow qualitative (correctness) and quantitative (performance) properties to be analyzed before the system is act...

The development of analytically tractable teletraffic models for performance evaluation of mobile cellular networks under more realistic assumptions has been the concern of recent works (Corral-Ruíz et al. 2010; Fang a; 2005, Fang b; 2005; Kim & Choi 2009; Pattaramalai, 2009; Rico-Páez et al., 2007; Rodríguez-Estrello et al., 2009; Rodríguez-Estrello et al., 2010; Wang & Fan, 2007; Yeo & Yun, 2...

The OpenMP API provides a portable model for efficient, high level thread-parallel programming across platforms, vendors, operating systems. We are developing a model with the same advantages to address compute accelerators. In this talk, we explore today’s accelerator landscape, along with the perils of current programming methods. We demonstrate why OpenCL, while impressive and important, doe...

To some the next iteration of Grid and utility computing, Clouds offer capabilities for the high-availability of a wide range of systems. But it is argued that such systems will only attain acceptance by a larger audience of commercial end-users if binding Service Level Agreements (SLAs) are provided. In this paper, we discuss how to measure and use quality of service (QoS) information to be ab...

Frequent inlet flow changes, especially in the same direction, typically cause problems for averaging level controllers. To obtain optimal flow filtering while being robust towards future inlet flow upsets closed loop robust MPC has been used. It differs from other averaging controllers in that it does not return the tank level to a fixed set-point, but rather lets it depend on the current inle...