EC-XAMAS: SUPPORTING E-COMMERCE ACTIVITIES BY AN XML-BASED ADAPTIVE MULTI-AGENT SYSTEM

Figures & data

FIGURE 1 The XML schema associated with the ontology of a client agent.

FIGURE 2 The ACML message that C A _ij sends to SA for requiring U P _j .

FIGURE 3 The XML schema associated with the ontology of the server agent.

FIGURE 4 The query performed by SA on its ontology to retrieve the user profile.

FIGURE 5 The XML schema of a site agent.

TABLE 1 Devices Exploited in Our Tests

Device	CPU (MHz)	RAM (Mb)	Screen Size	Bandwidth	Connection
Nokia 3650	—	—	176 × 208	up to 40.2 kbps	GPRS
Toshiba e740	400	64	240 × 320	up to 1 Mbps	Bluetooth
Desktop computer	2400	1000	1024 × 768	up to 56 kbps	PSTN
Desktop computer	2400	1000	1024 × 768	up to 640 kbps	ADSL
Desktop computer	2400	1000	1024 × 768	up to 10 Mbps	LAN

TABLE 2 Values of MAE _k , RMSE _k , and MeanError _k for Various Bandwidths

Bandwidth Bk (kbps)	MAEk	RMSEk	MeanErrk
38	0.49	0.36	0.40
56	0.38	0.30	0.32
128	0.21	0.15	0.11
256	0.15	0.13	0.07
512	0.13	0.13	−0.01
1200	0.24	0.17	−0.15

FIGURE 6 Distribution of users according to their Newell distance.