Kiyokuni Kawachiya

If the operating system could be specialized for every application, many applications would run faster. For example, Java virtual machines (JVMs) provide their own threading model and memory protection, so general-purpose operating system implementations of these abstractions are redundant. However, traditional means of transforming existing systems into specialized systems are difficult to ado...

One characteristic of continuous media is that they should be processed both continuously and periodically. Although "periodic ex'ecution models" are suitable for such processing, most ex'isting periodic models do not take account of resource reservation and adaptation (QOS control) in themselves, and such resource man- agement must be performed through some ex'ternal mechanism. In this paper, ...

The most notable characteristic of continuous-media data is the existence of timing constraints. To handle such data appropriately, some system support for resource management and QOS control is indispensable. For this reason, we are proposing a "QOS-Ticket" model which combines resource reservation and adaptation. The QOS-Ticket model has been implemented on RT-Mach. In this prototype, a new t...

A mobile computing environment imposes various restrictions on users. For example, most mobile devices have a limited screen size, and it may be difficult to watch the screen closely. While the user is walking or standing in a bus or train, he or she may have only one hand free to manipulate the device. Therefore, some new operation method must be developed for comfortable information brows...