This paper describes the operating systems – OS – for personal digital assistants – PDAs. Three systems, namely Windows CE, Palm OS, and Symbian OS are discussed. At first the general features of PDA operating systems are introduced. Then the differences of the three systems are discussed from the functionality, usability, and scalability of each system. After that some future predictions are g...

This paper reviews the concepts and mechanisms used to improve security in general purpose operating systems. The evolution from makrokernels to microkernels is illustrated, showing different approaches to achieve not only (more) secure but also practical platforms for legacy software applications. The ultimate method of proving correctness by formal verification is revisited. A real-world mikr...

Recent advances in network and workstation performance have made clustered computer systems an attractive solution for variable workloads, and both sequential and parallel applications. However, although the hardware is available to construct these distributed systems, rendering the system usable from an operators point of view is still an issue. The problem lies in that single computer operati...

The paper aims at providing a complete survey of contemporary distributed systems of that time. The authors define a distributed operating system distinguishing it from networked systems. The paper endeavours to also explain in detail the key design issues involved in the building of such systems. A few examples of research projects are considered in light of the issues discussed. A distributed...

An operating system is a fundamental component of most modern computer systems, Operating systems are close to the hardware, it masks the details of the underlying hardware from the programmer and provides lowest layer of software visible to users. It can be viewed as a resource manager, responsible for fair resource sharing between different processes in the system. On the other hand, Operatin...

Realizing elasticity in cloud applications today is often a cumbersome process, requiring applications to integrate with services like elastic load balancers and/or be rewritten to accommodate distributed frameworks like map/reduce or cluster-based operating systems. In this paper, we introduce the concept of ElasticOS, which enables a process (or even a single thread) to stretch its associated...

Teaching operating system need also practical experiments. Practical exercises in operating system up to now suffer from a high complexity of the experimental system, from concealing the internals of the operating system, and a scarce visibility of the phenomenon. The new capabilities of modern computers, and devices, respectively, associated with new concepts of operating system practical exer...

We would like to argue that building aspect oriented operating systems is a potential technology needs and promising solutions that can make a significant impact on the way we deign and produce software in the coming future. At the same time, the open, unresolved issues on the basic architecture and design of aspect oriented operating systems puts such adventure beyond the scope of today's shor...

ion is the key to managing complexity. Good abstractions turn a nearly impossible task into two manageable ones. The first one of these is defining and^aglementing the abstractions. The second one is using these abstractions to sol^He problem at hand. One abstraction that almost every computer user understands is the file. It is a useful piece of information, such as a digital photo, SEC. 1.1 W...