Welcome to the Takizawa laboratory!
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The Takizawa laboratory belongs to the
Dept. of Advanced Sciences, Faculty of Science and Engineering, Hosei University
With the supervise of Prof. Makoto
Takizawa, we are studying & researching on distributed
systems: especialy communication networks
High speed networks with the capacity of Giga-bps class, using
optical fibers, are going to be in general until the year 2010. In
those days, distributed applications, such as tele-conference,
tele-medicine, tele-classroom and so on, would be in used. Distributed
applications need to make entities create groups and act
Communication protocols used by these days, like OSI, TCP/IP,
etc., are for high relativity and efficiency in communication
between two entities. In comparison with this, entities in a group
needs to communicate with each other, that opponents may be two or
more. You can say that a communication of "line", and this of "plane"
and call this a group communication. In group communication, messages
send from each entities has to be delivered to plural entities in the
group. Then, the message must be recieved only when all of the
entities in the group can recieve it, and not in any when even a
single entity can't. Say this a atomic recievment. Also, when number
of entity is communicating messages, the order of the message recieved
in the group would be a problem. For some instance of ordering, there
are total ordering, all entities would recieve messages in the same
order, and local order preserving, preserving only the order of the
In these days, computer systems work cooperatively by connecting each
other by communication networks. We call those kind of systems a
distributed system. When many people use a distributed system at the
same time, it would be difficult to keep the data-base's integrity and
the through put in level. Also, there would be impossible to utilize
existing databases as an unified application.
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