A distributed system is a system with multiple autonomous computers managed by a coherent operating system. The main purpose is to increase the performance/cost ratio of the system. The multiple computers are transparent to users. A user uses a distributed system like a simplex computer. It is up to the operating system to select the best computer, find and transport all the input files to that...

The design of the computer system was significantly changed due to the emergence and popularization of the multicore processors. Moving to the advanced multicore processors, moving to the heterogeneous computer systems and increasing of the integrity level between computer system components are the main trends of the computer systems development. Significant changes in the computer systems desi...

Scheduling is a fundamental operating system function, since almost all computer resources are scheduled before use. The CPU is one of the primary computer resources. Central Processing Unit (CPU) scheduling plays an important role by switching the CPU among various processes. A processor is the important resource in computer; the operating system can make the computer more productive. The purp...

The dynamic development of transport in recent decades reflects the level economic world. sector today is one main barriers to achievement European Union’s climate protection objectives. More and more restrictive legal regulations define permissible emission limits for amounts toxic substances emitted into atmosphere. Numerical CO2 modeling tools are way replace costly on-road testing. Driving ...

This paper discusses computer-supported outbreak detection using routine surveillance data, as implemented at six institutes for infectious disease control in five European countries. We give an overview of the systems used at the Statens Serum Institut (Denmark), Health Protection Agency (England, Wales and Northern Ireland), Robert Koch Institute (Germany), Governmental Institute of Public He...

Computers come in all shapes and sizes: servers, laptops, tablets, smartphones, smartwatches, all the way down to that tiny microcontroller in a washing machine. People buy a computer because (i) it gives them access to the Internet, (ii) it provides storage, and probably also because (iii) it computes. While having network access seems to be vital, advanced storage and computing capabilities m...

BACKGROUND ROC analysis is widely accepted to assess and compare diagnostic validity of laboratory tests. Within the last few years, many new ROC programs have become available but have not been systematically evaluated. The aim of this study was to assess different ROC programs regarding their ease of use, mathematical correctness, final output, and their compatibility with other graphics prog...

In 2004 Blue Gene made a significant impact by introducing an ultra-scalable computer with a focus on low power. After that, Blue Gene/L maintained the number 1 spot on the top500 list for an unprecedented 7 lists. In 2007 Blue Gene/P was announced and a peak 1 PF machine installed at Juelich, and Blue Gene/P garnered the top position on the green 500 list. At Supercomputing 2011 we announced B...

We study the properties of eigenstates of an operating quantum computer which simulates the dynamical evolution in the regime of quantum chaos. Even if the quantum algorithm is polynomial in number of qubits nq, it is shown that the ideal eigenstates become mixed and strongly modified by static imperfections above a certain threshold which drops exponentially with nq . Above this threshold the ...

This paper presents a comparative study of the performance of three operating systems that run on the personal computer architecture derived from the IBM-PC. The operating systems, Windows for Workgroups (tm), Windows NT (tm), and NetBSD (a freely available UNIX (tm) variant) cover a broad range of system functionality and user requirements, from a single address space model to full protection ...