Ichiro Tomoda

Home gateway architecture and its implementation

We proposed the home gateway architecture. We have implemented the Web server based home gateway, interconnecting IEEE 1394, the powerline home automation network, and the Internet, with real-time AV transcoding capability.

Gateway technologies for home network and their implementations

We propose two gateway architectures. The first one is the home gateway, which interconnects home networks and the public (access) network. We show its requirements and software design. We implemented an experimental home gateway based on a Web server enhanced with Java facilities. It interconnects the Internet and the home networks (IEEE1394 AV network and the ECHONET home automation network). It also has a real time MP1394 transcoding function which transcodes AV data on IEEE1394 into MPEG4 video. It provides the capability of remote control of the home, and AV data transmission/translation capabilities. The second one is the wireless gateway. We show the background with respect to the wireless gateway and its design. The key issue is to develop interconnectivity between wired and wireless networks, and then we show our implementation of it. It interconnects IEEE1394 and 802.11b 2.4 GHz band high-speed wireless network, and transmits AV control commands and high-quality AV data.

Concurrent Object Oriented 'C' (cooC)

Concurrent Object Oriented C (cooC) is a language based on the premise that an object not only provides an encapsulation boundary but should also form a process boundary; each object acts concurrently. Upon this basic model various control regimes can be applied to provide different execution and service policies. The cooC language model employs wait-when-necessary communication and affords shared resource protection (via exclusive method invocation). The cooC runtime provides for several execution paradigms for object and method invocation. Varying runtime parameters (number of threads and a mail queue size) allow for: sequential compatible evaluation; fine and coarse grain concurrency; and eager and lazy evaluation, cooC is an extension to C. The underlying syntax of cooC is the same as that of Objective-C; moreover, Objective-C objects are cooC objects which are to be evaluated with a sequential runtime and employ no special synchronisation. The CooC compiler converts cooC into C and also supports C++. Hence cooC is a superset of C, C++ and Objective-C. We present cooCs concurrency object model, runtime and support for various execution and service policies.