7B-3-6 
declaration of the IEEE 802.11 standard is only the be 
ginning for numerous upcoming technologies. The form 
of integration in modern, real time capable IP-networks 
has to be discussed further. 
The TZI has contributed to the standardisation of 
service integration and real time transport of A/V infor 
mation [Bormann et al., 1998; Bormann, 1998a-c]. Ex 
tensive experiences in this area have been made within 
the projects MERCI, MECCANO, CONTRABAND as 
well as the HSDS project about satellite transmission of 
A/V information. First experiences with wireless LANs 
have been made also within the project CONTRA 
BAND (transmission of A/V information in conferences) 
3.4 Conclusions 
Figure 4. Maintenance scheme 
sub-process of the overall knowledge discovery process. 
Wrobel [1998] defines typical tasks: 
- Discovery of deviation of single objects within a 
given number of objects. 
- Discovery of dependencies between variables, e. g. 
association rules or probability networks. 
- Creation of clusters on the basis of given number of 
objects. 
- Classification and prediction of a number of objects. 
An important aspect of KDD/DM is the possibility 
to create hypothesis about inter-dependencies within 
the data automatically. When activities in the area of 
data analysis are manual in the past there is a new di 
mension in data analysis coming up with KDD/DM. 
The TZI has developed numerous approaches which 
contribute to the area KDD/DM. Boronowski [1998], 
e. g. proposed a method for the interpretation of mul 
tiple time series. With this method it is possible to dis 
cover qualitative dependencies automatically. For this 
method we developed an extension that allows the user 
to use this algorithm with an arbitrary decision tree al 
gorithm such as C4.5 [Quinlan, 1993]. Among others, 
methods of machine learning and advanced statistics 
axe being used. 
Wireless Computing Outside of the mobile com 
puting area, where questions about the source- and 
channel-encoding are dominating, the literature about 
the use of IP-networks and RTP for wireless transfer of 
real time information is focused on applications in the 
military area [Murphy et al., 1997, Gage, 1997, Gage 
et al., 1998]. Although the actual discussion within this 
publications provides a general proof-of-concept for our 
approach, the communication technical solution space 
has not been explored in detail. With the development 
of wireless LANs (WLANs) increasing its speed, the 
Within the project WINSPECT we are developing an 
information technological infrastructure, firstly pre 
pared with wireless LAN for the inspection processes. 
The wearable computer will have numerous sensors (e. g., 
camera, audio-sensor, vibration sensor) collecting data 
into one second resolution. In order to transfer the data 
for the analysis process to the server, the data has to 
be reduced without compromising quality. A new data 
mining approach is being used for this purpose. On 
the server, the data will be analysed with knowledge 
discovery methods in order to find new knowledge aid 
in planning the maintenance processes more efficiently 
and reducing the overall costs. 
The support of wearable computer for data acqui 
sition within the maintenance processes displays large 
potential. Using this computer for data acquisition is 
possible and worth considering, but can squander other 
valuable options. The complete significance of this new 
hardware technology will be developed if the integration 
of this platform in the overall workflow of the enterprise 
succeeds. Therefore, it is necessary that additional tech 
niques, e. g. wireless communication and tools for anal 
ysis and planning be integrated also. When considering 
higher abstraction levels (CIM concepts) more poten 
tial will be created. 
An automatic planning and analysis process of in 
spection gives the user options to form a work process 
that is more flexible. This aspect is very important for 
an application because it is not possible to foresee ev 
ery inspection process in detail. Restricted planning is 
unrealistic and very often works contra-productive nor 
mally. The use of wearable computer offers a kind of hi 
erarchical inspection because the inspection is expand 
able, dependent on the actual inspection results. The 
proposed scenario is a closed process with evolutionary 
character because results of the last inspection process 
will flow back in the new planning process. The use of 
wearable computer is an important link between plan 
ning and analysis.