The last years have seen dramatic changes in the way the world stores, manages, and uses its data. Whereas the end of the previous millennium saw an emphasis on decentralized, desktop-based storage and manipulation of data, we are now seeing information technology returning in great part to a model of centralized, professionallymanaged computation and data delivery services, using increasingly ...

The performance of any system cannot be determined without knowing the workload, that is, the set of requests presented to the system. Workload characterization is the process by which we produce models that are capable of describing and reproducing the behavior of a workload. Such models are imperative to any performance related studies such as capacity planning, workload balancing, performanc...

1 Abstract Introspection in computer systems enables a computer to examine its own computational behavior. Knowledge gained by introspection can be used by the computer to optimize itself and to explain its own behavior to other computers or to human observers. In increasingly complex computer systems, introspective computers can be applied to managing their own complexity. A computer capable o...

This paper describes a new algorithm for top-down parsing of general context-free grammars. The algorithm does not require any changes to be made to the grammar, and can parse with respect to any grammar non-terminal as the start symbol. It is possible to generate all possible parse trees of the input string in the presence of ambiguous grammars. The algorithm reduces to recursive descent parsi...

Intelligent Vehicle Highway Systems (IVHS) is the integration of various pieces of information and computer technologies to the transportation elements in order to obtain a more productive transportation system. The five major components of IVHS are the Advanced Traffic Management Systems (ATMS), Advanced Vehicle Control Systems (AVCS), and Advanced Public Transportation systems (APTS). This pa...

Adaptive control theory is emerging as a viable approach for the design of self-managed computer systems. This paper argues that the systems community should not be concerned with the design of adaptive controllers—there are off-the-shelf controllers that can be used to tune any system that abides by certain properties. Systems research should instead be focusing on the open problem of building...

T o those involved with their development, computer-based medical systems offer unique professional rewards because their application can directly benefit the well-being of mankind. Imagine for a moment the enormous satisfaction of watching a computer-based heart-lung machine you helped develop sustain the life of a 40-year-old man whose heart is stopped during open-chest surgery. With the mach...

1.1 Introduction Sum of all time between part development and part expedition represents time to market. Time to market direct influences on the total production cost. It is sufficient that time to market and the production costs is minimum. The computer aided (CA) systems influence on the factors of competitive advantage.

Surely, nobody could have foreseen the degree to which we have become reliant on computer systems in our daily lives. They wake us up in the morning, cook our food, get us to work, control the traffic in the streets, entertain us, give us cash from our bank accounts (under certain conditions!), help to treat our diseases, monitor our health, and even defend us from potential threats. The increa...

Diversity is an important source of robustness in biological systems. Computers, by contrast, are notable for their lack of diversity. Although homogeneous systems have many advantages, the beneficial effects of diversity in computing systems have been overlooked, specifically in the area of computer security. Several methods of achieving software diversity are discussed based on randomizations...