Community Computing - Advanced Design Approaches to Emerging Software Systems - page 208

and represent it in member policy description. In
the society description, additional society policies
are described, and the precedence of communities
and exclusive communities are defined. When a
society manager takes more than one request for
community instantiation, these policies are used
to select requests to allow instantiations.
CIM-PS . In CIM-PS, the information about an
attribute acquisition, action mapping, and member
configuration is added. In the attribute acquisition
part, we describe which values of each attribute
are derived from where. The source of attribute
values can be a kind of sensor or member's ac-
tions. In action mapping description, we describe
how to realize actions of members. In cases where
a system uses existing programmed objects, a
developer should make a connection between
actions in the model and programmed actions in
an existing object. On the other hand, in cases
where developers have to generate programs for
member objects, developers are able to use action
names in models to program a member. In the
member configuration part, components of each
member such as sensor drivers, operating systems,

and communication channels are described. An
example based on COEX scenario (See Section
6: Implementation) is shown in Table 4.
Model Transformation . As the model trans-
formation process of the simple model, we derive
source codes from CCM to develop a community
computing system. The specific transformation
process for the static community situation based
model is shown in Figure 2.

COMPUTATIONAL MODEL

To run a community computing system, we pro-
posed a computational model as shown in Figure
3. According to the computational model, when
a system starts to operate, only members exist
in a society.
At the beginning of a community computing
system, a society manager who manages the whole
community computing system is generated. The
society manager contains information about all
the member and community types and protocols
for society registration, community manager

Figure 2. Model transformation of the static community situation based community computing model