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Discretising the regularised integral equation (3.16) with
piecewise constant shape functions, one obtains the following equation:



(3.38) 
where S_{J} is a plane element in S and
represents on S_{J}. In (3.38) the righthand screw convention is
applied to the direction of the integration along
.
We use
(3.38) for the direct computation instead of
(3.16). In the similar way the multipole moment
in (3.31) is rewritten as



(3.39) 
where S_{L} is a plane element in S_{y} and
represents on S_{L}.
Kenichi Yoshida
20010728