[IEEE The Fourth IEEE Workshop on Software Technologies for Future Embedded and Ubiquitous Systems, and the Second International Workshop on Collaborative Computing, Integration, and Assurance (SEUS-WCCIA'06) - Gyeongju, Korea (27-28 April 2006)] The Fourth IEEE Workshop on Software Technologies for Future Embedded and Ubiquitous Systems, and the Second International Workshop on Collaborative Computing, Integration, and Assurance (SEUS-WCCIA'06) - Impact of Practical Models on Power Aware Broadcast Protocols for Wireless Ad Hoc and Sensor Networks